Control method and device of current supplied to electronic devices

FIELD: electricity.

SUBSTANCE: proposed excitation and control device supplies the required switched current to load containing circuit of one or more electronic devices. Voltage conversion device on the basis of input control signal converts value of voltage obtained from voltage source to the other value required on the side of high voltage of load. Control device of change of light intensity provides control of activation and deactivation of load and can also provide current limiting means. Feedback means are connected to voltage conversion means and to current read-out device and supplies control signal to voltage conversion means, which indicates voltage drop in current read-out means which represent the current passing through load. Based on the received control signal, voltage conversion means can regulate its output voltage so that direct switched current can be supplied to load.

EFFECT: higher operating efficiency.

15 cl, 22 dwg

 

The technical field

The present invention relates to the field of electronic control devices, in particular to a method and apparatus for controlling a switched current excitation of electronic devices.

Description of the prior art

Recent advances in the development of semiconductor light emitting diodes (LEDs) and organic light emitting diodes (osid) have made these devices are suitable for applications in General lighting, including, for example, lighting, architectural structures, recreational and road facilities. These devices are increasingly competitive with incandescent lamps, fluorescent lamps and discharge lamps high intensity.

The amount of light emitted from the LED in the work environment, directly depends on the electron current passing through the device. Because of changes in the characteristics of the device the same current in the device can give significantly different output luminous flux in certain operating conditions, even if these LEDs are of the same type. When the excitation current of the series-connected LED falls below a certain limit, some LEDs can completely stop emitting light before it happens with others, and this can lead to undesirable mode of operation. Such effects arise mainly due to stake the project characteristics forward voltage at different LED. The tolerable limits of oscillation of the output luminous flux of the LED is typically depend on the type of lighting application. When lighting is required to use more than one LED, the characteristics of the LED should normally be very close agreed that it was possible to simplify the circuit design of excitation. Was offered a number of designs exciting circuit, which can effectively control the excitation current of the LED. Most of these structures belongs to the category of linear circuits, excitation constant current, which can support the passage of the same excitation current through the serially connected LED. However, many linear schemes excitation DC subject to large power losses and require electronic devices of a certain power and careful temperature control. For most schemes excitation direct current or switching current required a complex system of feedback control to ensure precise and reliable control of light output, if you want to provide a wide range of operating conditions, including a small partial nominal light output.

In other solutions, aimed at effective management of the LED, you want to use pulse inverting regulator, forming a common adjustable voltage source, ellastic resistors on the low voltage side, to set the excitation current of the LED, and parallel resistors to control the current. For example, in U.S. patent No. 6362578 describes how you can use the bias resistor for current control and the voltage Converter with a feedback circuit to maintain constant tension on the matrix LED. An additional transistor connected to the low voltage side LEDs and switches using pulse width modulation (PWM) to control the output luminous flux. This excitation circuit has a large power loss due to the presence of bias resistors, in addition, the bias resistor may require costly calibration to ensure accurate current control. Furthermore, in U.S. patent No. 4001667 described automatic control system, which transmits a sequence of pulses of constant current light-emitting diodes to control the output luminous flux. However, this automatic control system is not able to control the duty cycle of the current pulses in full.

In U.S. patent No. 6586890 described the way in which the system is used with a feedback current to adjust the power supplied to the LED, in which the low-frequency control signal PWM stimulates the power source. However, this method uses frequency ne is clucene PWM from 20 Hz to 20 kHz, creating zvukostudii noise and can adversely affect the LED due to thermal Cycling matrix LED, reduce the reliability and lifetime of devices.

In U.S. patent No. 6734639 described a method of restricting excessive single pulse excitation current circuit switched excitation matrix LED with a voltage Converter in combination with a special circuit sampling and storage. The excitation signal LED is connected with the signal shifted switching for multiple translations of the voltage Converter in a state of "on" and "off" in order to simultaneously load switching and power supply. However, this method can only be applied to flyback and push-pull voltage converters, and it is not possible to control the excitation current of the LED directly. This method does not provide a significant reduction in power loss of the exciting circuit or increase the overall efficiency of the system. In addition, this method usually only works within the required parameters to the frequency of excitation is of the order of 400 Hz and does not allow switching at high frequency. Consequently, this known circuit can create unwanted zvukostudii noise and impose excessive thermal stress on the matrix compounds which were LED.

In addition, in the application for U.S. patent No. 2004/0036418 described method of excitation matrix LED in which to change the current passing through the LED, use the Converter. The switching current is in order, providing feedback. This method contains the essential elements of a standard buck Converter, but he can't manage parallel strings of LEDs, which require different direct voltages. In this way it is proposed to use transistor switches high voltage as variable resistors for current limiting on each chain of LED, however, the transistor switches on the high-voltage side can make a big power loss and reduce the overall efficiency of the excitation scheme.

Power Integrations Inc. manufactures analog integrated circuits, which allow efficient and practical to drive LEDs. In Power Integrations Inc. the method was developed for power conversion, called eDI-92, in which only requires a minimum number of components and which is particularly suitable for lighting applications with low power consumption, for example, for signs emergency exit or night light marks. However, this solution does not change in intensity, the ability to switch the load and the means to control the peak load current at the moments of switching voltage Converter.

In addition, the company austriamicrosystems AG offers high-performance analog integrated circuit AS3691, which can be used to control from one to 4 LEDs at currents of excitation to about 1.6 a configuration with one LED and 400 mA for each LED in the configuration with four LEDs. AS3691 has a very specific design scheme feedback voltage Converter, which is able to limit the output voltage of the voltage Converter. However, this chip control Converter is a tool to maintain voltage regulation for chains LED with digital switch to change the light intensity. This chip is used in the internal current limit during all periods include ensuring that the maximum load current will never exceed the desired preset value. This approach can degrade overall system performance. The reduction efficiency can be exacerbated when the switching frequencies higher than a few hundred Hertz, so as not provided by the facility to maintain the specified voltage values during a period of "off", and therefore, the internal circuit current limit must be active during most periods of activation. In addition, this chip control does not allow effective to excite the LED in a wide range of direct voltage, and typically requires configuration of each LED or string of LEDs using external resistors.

In addition, figure 1 shows the relative current that can pass through the load in the circuit with a switch-mode voltage Converter. The rise time 111 and the fall time of 112 current is directly related with the speed at which the switching Converter can change the current supplied to the load. For example, when this procedure is used to activate the LED, the light output of the LED during transitional periods, such as periods of rise and decline, may not meet AYP, so there may be fluctuations in the light output and it can be clearly seen, for example, during small periods of activation.

There is therefore a need for a device and method for efficient control and design of an electronic circuit current excitation light-emitting element, which would allow to solve the above problems of the prior art.

The applicant believes that presents information about the state of the prior art may have significance for the present invention. However, it is not intended to be and should not be construed that any of the above information are defamatory to the present invention.

The invention

The basis of this and is finding the task of creating a method and apparatus for current control, applied to electronic devices. According to one aspect of the invention, an apparatus for excitation and control designed to control the current supplied to the chain one or more electronic devices, comprising: a voltage Converter configured to receive the first voltage value from a power source and convert the voltage of the first magnitude in the voltage of the second magnitude in response to the control signal; a means of controlling light intensity, is configured to receive the second voltage value and the control signal light intensity, to control the transfer voltage of the second value chain on the basis of the control signal light intensity, and means of control of light intensity can work in several modes, and the control signal light intensity indicates the desired mode of operation controls the light intensity; means read current, connected in series with a chain, intended for generating a feedback signal indicating the current passing through the chain; and a feedback tool that is electrically connected to the voltage Converter and a means of sensing current is made capable of receiving signals is and feedback, and generate a control signal based on the feedback signal, and with the possibility of transmission of the control signal to the voltage Converter.

According to another aspect of the invention, a method of current control applied to a chain of one or more electronic devices, namely, that make a selection of the current flowing through the chain; adaptive transform voltage from the first voltage value in the voltage of the second magnitude in response to the feedback signal indicating the current sample; regulate the supply voltage of the second value chain on the basis of the control signal light intensity, and the intensity of the modified adaptive on the basis of the control signal light intensity.

Brief description of drawings

Figure 1 presents the time dependence of the excitation current load when performing switching in a voltage Converter, as is known in the prior art.

Figure 2 illustrates the lighting installation with a device for excitation and control in accordance with one implementation of the present invention.

Figure 3 presents the time dependence of the excitation current of the lighting system with the control circuit of the light intensity in accordance with one variant of the present invention.

Figa illustrates a typical dependence of the current opened the program from time to device excitation and control, containing a combination of feedback loops with sampling and storage and a simple load switch type on/off, in accordance with one variant of the present invention.

Figv illustrates a typical dependence of the excitation current over time for a device to initiate and control that contains a combination of feedback loops with sampling and storage and switchable resistive load, in accordance with one variant of the present invention.

Figure 5 illustrates the lighting installation with a device for excitation and control in accordance with another variant of the present invention.

6 illustrates a lighting installation comprising a single power source with many chains of light-emitting elements, each of which contains a device for the excitation and control in accordance with one variant of the present invention.

7 illustrates a lighting system with a device for excitation and control in accordance with one variant of the present invention.

Fig illustrates a lighting system with a device for excitation and control in accordance with the variant shown in Fig.7.

Fig.9 depicts the diagram of the exciter light-emitting element, the blue spectrum in accordance with one variant of this izaberete the Oia.

Figure 10 depicts the scheme of the first exciter light-emitting element, the green spectrum in accordance with one variant of the present invention.

11 depicts a scheme of the second exciter light-emitting element, the green spectrum in accordance with one variant of the present invention.

Fig depicts a diagram of the exciter light-emitting element of the red spectrum in accordance with one variant of the present invention.

Fig illustrates a lighting system with a device for excitation and control in accordance with one variant of the present invention.

Fig illustrates a lighting system with a device for excitation and control in accordance with one variant of the present invention to Fig.

Fig illustrates another lighting system with a device for excitation and control in accordance with the variant shown in Fig.

Fig illustrates a lighting system with a device for excitation and control in accordance with one variant of the present invention.

Fig illustrates a lighting system with a device for excitation and control in accordance with the variant shown in Fig.

Fig illustrates a lighting system with a device for excitation and control in compliance and with the option shown in Fig, in which the means to control the light intensity is located on the high-voltage side chain of one or more light-emitting elements.

Fig illustrates a lighting system with a device for excitation and control in accordance with a variant of the present invention.

Fig illustrates the circuit configuration of a voltage Converter that can be done that can be integrated in the lighting installation with a device for excitation and control according Fig.

Fig illustrates a lighting system with a device for excitation and control according to another variant of the present invention.

Detailed description of the invention

Definition

The term "power source" is used to refer to systems containing the input and output to convert the first form of electricity, arriving at the entrance, bringing the first form of electricity, the second form of electricity and submit a second form of electricity output. The power supply can accept a pre-defined range of forms of electricity input and can produce electricity at a pre-defined range of forms of electricity and feeding it to the output.

The term "inverter" is used to refer to systems containing the input and output, to which I can convert the input voltage of the first magnitude in the output voltage of the second magnitude, the first and second values may be the same or different.

The term "electronic device" is used to denote any device, operating mode which depends on the form supplied electricity. Examples of electronic devices include light-emitting elements, motors and other devices that require regulation forms supplied electricity, as will be easily understandable to experts in this field.

The term "light emitting element" is used to denote a device that emits radiation in any region or combination of regions of the electromagnetic spectrum, for example, in the visible, infrared and/or ultraviolet region, when you activate it, for example, by the application thereto of a potential difference or passing current through it. Therefore, the light-emitting element can have characteristics of monochromatic radiation, monochromatic, polychromatic or broadband spectrum. Examples of light-emitting elements include semiconductor, organic, or polymer-polymer light-emitting diodes are covered with phosphor light-emitting diodes pumped in the blue or UV region of the spectrum, optical inflated nanocrystal light-emitting diodes or other similar devices known in the art. The AOC is e, the term "light emitting element" is used to designate a particular light-emitting device, for example, LED matrix, and can equally be used to denote the combination of the specific device that emits radiation, together with the casing or packaging inside this specific appliance or device.

The term "chain" is used to denote a variety of electronic devices connected in series or parallel or series-parallel. For example, a chain of electronic devices can belong to more than one identical or different electronic devices that can be activated simultaneously when a voltage is applied to the entire chain, causing excitation them all one and the same current, as will be easily understandable to specialists. Parallel chain may include, for example, to the N electronic appliances, located in M rows, where each row are connected in parallel, so that all NxM electronic devices can be activated simultaneously by the supply voltage to the entire circuit, to cause the excitation of all N devices approximately 1/M fraction of the total current supplied to the entire chain.

The term "load" is used to refer to one or more electronic devices or one or more chains of the electronic device is in, to which power is supplied.

The terms "switching period" and "rate of turn" are used interchangeably and refer to the time in the "on" state for a certain period of time, when it comes to digital switching, for example, pulse-width modulation (PWM), which has a certain period of time.

In this context the term "about" means a deviation of +/-10% from the nominal value. It should be understood that such deviation is always included in any specified value, unless specified otherwise.

All technical and scientific terms used herein have the same meaning in which they are typically used by specialists in the technical field to which the invention relates, unless otherwise indicated.

In accordance with the present invention, an apparatus for excitation and control and method for use with electronic devices through which you want to skip DC, as well as to electronic devices, which may require the control signal. For example, the proposed method and the device can be used to provide source switchable constant current for one or more light-emitting elements is controlled using a signal with pulse-width modulation (PWM), pulse-to the annual modulation (PCM) or other known digital control method. The present invention also provides a method and apparatus for providing sources switchable constant current for a variety of electronic devices, which have different direct voltage. For example, if you want to provide power to the many chains of one or more light-emitting elements from a single power supply, the present invention allows to provide a specific voltage to the high-voltage side of each chain of light-emitting elements and a switchable constant current through each chain.

The device excitation and control in accordance with the present invention provides the desired switched current to a load, comprising a chain of one or more electronic devices, and contains one or more means of voltage conversion, one or more controls light intensity, one or more means of feedback or one or more means of reading. The conversion tool voltage based on an input control signal converts the voltage from the source voltage to another value that is required on the high-voltage side of the load. The management tool changing intensity provides control activation and deactivation of the load, and may additionally serve as a means of the m current limit. The feedback tool is connected to the conversion tool voltage and the means of reading power and provides the control signal conversion tool voltage, which shows the voltage drop across the tool read current representing the current passing through the load. The tool read current may contain an element that is projected against the voltage-current and therefore can give a measure of the current through the load, on the basis of the captured voltage signal. On the basis of the received control signal conversion tool voltage can then adjust its output voltage so that the load received constant switching current.

Figure 2 shows a lighting installation comprising a device for excitation and control in accordance with one variant of the present invention. The source 11 is connected to the inverter 12 voltage, which supplies a suitable voltage at node 1000 high voltage of one or more light-emitting elements 15. The Converter 12 voltage can be switched internal or external means with a high frequency, by changing the input voltage to a different output voltage at node 1000 high voltage chain of one or more light-emitting elements 15. In one embodiment, the often is and switching can vary, for example, in the range of 60 kHz to 300 kHz, or in other suitable frequency range. In another embodiment, the switching frequency can be fixed, for example, about 260 kHz or 300 kHz. The light intensity of light-emitting elements is provided by signal 140 control the light intensity, which may be a signal with pulse-width modulation (PWM), pulse code modulation (PCM) or other signal which is fed into the tool 180 control light intensity, which means the activation/deactivation of a chain of one or more light-emitting elements 15. Control the light intensity includes operational amplifier 17 for reception of a signal 140 control light intensity, showing the switching period, and transmits the control signal to the switching means 900 is connected in series with a chain of one or more light-emitting elements 15. The tool 910 read current is integrated in the device excitation and management and serves as a means for determining the current flowing through the light emitting elements, for example, in the node 1020. In addition, in the device of excitation and control of the integrated tool 190 sampling and storage, which can serve as a means for signal transmission 5000 current feedback in conversion on the tel voltage for current control, passing through a chain of one or more light-emitting elements 15.

In the variant shown in figure 2, the current control can be done in two different ways, which may depend on the setting period. During large periods of the enable output voltage of the voltage Converter can be controlled using the 190 sample and hold, to sum specified peak current to light emitting elements, thus switching the tool 900 can act as a toggle switch on-off". At small periods include peak current may become unstable due to the response characteristics of the tool 190 sample and hold and the speed of the voltage Converter to the rapid changes of the load current. This instability can be seen on figa, which represents the peak current of the lighting elements managed by the scheme, which provides switching of light-emitting elements only on the type of "on-off". During the state of "off" of the previous period, the output of the voltage Converter 12 can be overheated, and this can lead to a surge of current flowing through the light-emitting elements in the first moment, when the light emitting elements are activated switching means 900. Diagram of the feedback sampling and storage etc the educational voltage will eventually lead this peak current control, however, for small periods of inclusion for this may not be enough time, and therefore, the pulse small periods of inclusion may have a higher peak current than the pulses of large periods of activation.

Therefore, in the present invention, instead of relying solely on the means of sample and hold to limit peak current, you can configure the tool 180 control the light intensity with current limit alternative specified level, which may be, for example, slightly above the peak current set by means of sample and hold. This configuration is shown figv, illustrating that the emission current is now limited by the second means of current limitation. For example, a high level or level "on" signal 140 control the light intensity can be set proportional to a given second level of the peak current, and then the control signal by changing the intensity of the light will alternate between these proportional level and the ground instead of the logical switching level. In response to the feedback signal detected by the operational amplifier 17, the switching means 900 enters the enabled state only partially for a short period of time at the beginning of each switching period, that Ogre is ICICI emission current, and for the rest of this period, when the sample and hold charge switching means 900 is translated fully in the "on"state, thereby minimizing the loss on the switch. Because the same feedback signal from the means 910 read current is used as the operational amplifier 17, and means 190 sampling and storage, between these two levels peak current will be essentially smooth transition. When the means of sample and hold and the voltage Converter start to regulate the current, the operational amplifier will be tougher to translate the switching means in the "on" status until such time until it is fully in the "on"state, and will no longer be a limiting factor for the current passing through the electronic devices.

In one embodiment of the present invention given threshold defining the transition between the large setting period and a short period of inclusion is from about 5% to 30%. In other embodiments, this predetermined threshold is between 10% and 20%. In yet another embodiment, the predetermined threshold is 10%.

In one embodiment, the present invention can also reduce the transition States of the switch and to improve the response time for the operational management of light-emitting elements, so as to switch on the power (one or more electronic devices) requires switching of only one switching means in contrast to on-and off-voltage Converter, when you want to switch many components. For example, figure 1 shows the relative current that can pass through the load when the voltage Converter is switched on and off with a low frequency. Figure 3 shows the relative current which may pass through one or more electronic devices, when using the proposed device excitation and control, which switches the load. You can easily see that the rise time 113 and the fall time of signal 114, shown in figure 3, can be much smaller than the rise time 111 and the fall time of signal 112 in a known counterpart, shown in figure 1. Electronic devices can switch with it digitally with a high frequency, while substantially reduced switching losses for most of the period of inclusion compared with switching voltage Converter with low frequency, as is done in known analog. In addition, the device excitation and control in accordance with the present invention allows to improve the performance of electronic devices during small periods of inclusion, since there is a method of switching voltage Converter between the States "on" and "off" prevents small periods enable higher frequencies, as suggested from Britanie allow.

In addition, the device excitation and control in accordance with the present invention can provide essentially the management setting period, while ensuring a relatively constant current over the entire range. As discussed above, figa shows the relationship between output current and the period enabled for a circuit containing only sample and storage, and figv illustrates the relationship between output current and the period of inclusion, which may be provided with a device for excitation and control in accordance with the present invention, in which there are two levels of current control. For example, maintaining a constant current in the "on"state, passing through the light-emitting elements, allows to obtain essentially constant and predictable output luminous flux of the light emitting elements, and reduce the risk of reducing the life of light-emitting elements, which may occur as a result of exceeding their maximum rated current. For example, the known sets odnawialny LED high flux density have a maximum nominal level for the average and instantaneous current of about 350 mA and 500 mA, respectively. As you use the device excitation and control in accordance with the present invention can be controlled exactly that is, light-emitting elements can work essentially on the maximum nominal average current with less or limited risk of exceeding the maximum value of the instantaneous current.

Figure 5 shows a variant of the device of excitation and control in accordance with the present invention, which provides another option scheme means 19 sampling and storage. The device 16 of the read current is made in the form of a resistor having a specified relation to the voltage-current, and is thus a tool to determine the current passing through a chain of one or more light-emitting elements 15 by detecting the voltage at node 102. In addition, the switching means 13 associated with the tool control light intensity, made in the form of a transistor that responds to a signal from the operational amplifier 17 that outputs a signal based on a received signal 140 control the light intensity.

In one embodiment, it is possible to make the excitation of multiple chains of one or more light-emitting elements using a single power source 21, as shown in Fig.6. Each chain of light-emitting elements 241, 242 and 243 can have its own voltage Converter 221, 222 and 223. This configuration can be useful in cases where each chain odgovori more light-emitting elements has a different full direct voltage. Each voltage Converter, respectively, is adjusted to provide the required forward voltage for the respective chain of one or more light-emitting elements 241, 242 or 243. The control signals 231, 232 and 233 are accepted by the relevant operational amplifiers 251, 252 and 253, which are part of each respective controls the light intensity associated with each chain of one or more light-emitting elements. The feedback signals representing the current passing through each chain of one or more light-emitting elements 241, 242 and 243 can be passed back to the appropriate voltage converters 221, 222 and 223 through appropriate circuits 291, 292 and 293 of the sample and hold, which receive signals directly from their respective operational amplifiers 251, 252 and 253. The advantage of providing each chain one or more light-emitting elements of the individual voltage Converter is that each chain of one or more light-emitting elements can operate approximately at its individual maximum rated current. Furthermore, the presence of voltage converters and tools for digital switching voltage for each chain may allow to adjust Silonite for each chain of one or more light-emitting elements in the whole range from 0% to 100% of the output luminous flux of the light emitting elements.

The conversion tool voltage

The conversion tool voltage is used to convert a voltage of the first magnitude, is obtained from the power source, the second voltage value depending on the input signal. It is clear that the first and the second value may be the same or different, and they may depend on the desired voltage drop in one or more chains of one or more electronic devices.

In one embodiment, the power source can be used, for example, to convert the variable power is constant, and the conversion tool voltage may be a DC-to-DC. The DC-to-DC may be lowering the switching power supply, for example, a booster Converter. Booster Converter or any other Converter can be used with standard external components such as a diode, capacitor, inductor and feedback elements. Buck converters are available in standard housings integrated system (is), and together with additional components they can convert DC to DC performance of about 90% or higher. Examples of other converters that can be used instead of the booster Converter is El, include boost converters, intermediate booster converters, the converters of the type of cook and flyback converters.

The voltage Converter can operate with high frequency to form specific voltage required for a chain of one or more electronic devices, for example, light-emitting elements, which may be a stable output voltage with limited harmonic distortion. During the operation of the voltage Converter with high frequencies, it is possible to achieve high productivity and low ripple voltage in the output signal. In addition, switching from high frequencies can afford to switch one or more electronic devices with such a high frequency that they are outside svalastoga range, and also may contribute to the decrease of thermal Cycling of electronic devices. All this is an advantage compared with switching voltage Converter between the States "on" and "off", usually performed at low frequencies, for example, typically less than 1 kHz, which is within the normal range perceived by the human ear.

In one embodiment, when multiple chains of one or more electronic devices, for example, light-emitting elements, which require the same supply voltage on the high-voltage side chains, high voltage these chains of light-emitting elements can be connected to a single inverter. For example, for the color of the lighting device voltage Converter can be associated with all the chains of one or more light-emitting elements of the same color, and therefore this type of lighting requires three voltage Converter. In addition, chains of light-emitting elements can be connected in parallel, series or series-parallel.

Control light intensity

The means of control of light intensity is used to control activation of one or more electronic devices with which it is associated. Control the light intensity is made with the possibility of controlling the supply of relatively stable level of current to one or more electronic devices, and this control does not depend on the period of subscription.

In one embodiment, the light intensity of light-emitting elements is usually done by switching devices in the state of "on" and "off" with the frequency at which the human eye perceives light output as the average light level depending on the period of inclusion and not as a sequence of light pulses. Therefore, the relationship m the waiting period and light intensity may be linear over the whole range of variations in light intensity, assuming that the peak current is kept constant regardless of the setting period. In figure 2 the light intensity can be secured using signal 140 control the light intensity passing through the operational amplifier 17 and then transmitted to the switching means 900, allowing you to enable and disable the chain of one or more light-emitting elements 15 with which it is associated.

In one embodiment, the switching means may be a semiconductor switch, for example, the switch field effect transistor (FET), bipolar planar transistor (BJT) or any other switching device known in the art. The load usually can be switched with a frequency below the switching frequency conversion tool voltage, so that the pulsation power at the output is averaged over a period of time during which one or more electronic devices are in the "on"state. Switching of electronic devices with a relatively high frequency can afford to switch them with frequencies lying outside svalastoga range. Additionally, switching a load with a relatively high frequency can reduce the effect of thermal Cycling on electronic devices, as they pass into the enabled state at a small fraction of time before the subsequent transition to the off state.

In one embodiment, for example, during small periods of inclusion, when the feedback signal becomes too low to adequately manage the conversion tool voltage, the control light intensity includes means for limiting the current by activating the switching means in the linear region, so can only pass a certain amount of current.

During small periods on and as shown in figure 2, the signal 140 control the light intensity can be switched at a given voltage level to transmit the reference voltage to the operational amplifier 17. During phase enabled operational amplifier 17 can essentially maintain the same voltage at node 1020, as specified by signal 140. The voltage at node 1020 is directly related to the current passing through the tool 910 read current. If the tool 190 sampling and storage supports current slightly lower than what is specified signal 140 control the light intensity, the operational amplifier 17 will initiate switching means 900 to full "on". If the tool 140 sample and hold is no longer able to keep the current at a given level, the operational amplifier 17 will control the switching means 900 in the linear region, thereby limiting the current, prog is handled through a chain of one or more light-emitting elements 15, value set signal 140 control the light intensity.

The tool reads

The tool reading is intended to provide feedback on current passing through one or more electronic devices, for transmitting a means of voltage conversion. Thus, it is possible to maintain a relatively constant level of current passing through one or more electronic devices, during periods of activation.

In one embodiment, shown in figure 5, the device 16 of the read current is made in the form of a constant resistor, which has a predetermined relation of current to voltage, thereby enabling to detect the voltage at node 102 and to establish a flow of current through a chain of one or more light-emitting elements 15. When a chain of one or more light-emitting elements 15 is placed into the "on"state, the voltage readout node 102 generated by the device 16, the read current is fed back into the voltage Converter 12 through the circuit 19 sampling and storage. In an alternative embodiment, the device 16 of the read current can be replaced with a variable resistor, inductor, or any other element for forming a voltage reading at the node 102, which represents the current passing through the chain of light-emitting elements 15 during phase on the constrained". In one embodiment, the device 16 of the read current is a precision resistor with a low value, which is stable in a wide temperature range to provide accurate feedback.

The feedback tool

The excitation device and the control further comprises a feedback tool connected to the tool conversion voltage and the means of read current, to transmit a feedback signal conversion tool voltage, which shows the voltage drop in the tool read current representing the current passing through the load of one or more electronic devices. Therefore, it is a means for proper adjustment of the magnitude of the voltage conversion tool voltage to one or more electronic devices for their work.

In the variant shown in figure 5, the means of sample and hold is used to maintain a given level of current flowing through the electronic device, induced during the phase of "enabled". When the transition to the enabled state, the current passing through the electronic devices, causes the generation of signal 510, which is fed back through the tool 19 sampling and storage in the Converter 12 voltage as the signal 500. Then the Converter 12 voltage regulates its output voltage, h is usually used to apply a constant current in a chain of one or more light-emitting elements 15. When a chain of one or more light-emitting elements 15 is placed into the off state, the tool 19 sampling and storage stores the signal 500 feedback up until a chain of one or more light-emitting elements 15 is again moved to the "on"state. When the load is switched back to the "on"state, the output voltage will still have the same specified value as the load switching in the off state, which virtually eliminates any spikes or fall of current in the load. As will be clear to the expert, the tool 19 sampling and storage can be implemented in various types of electronic circuits.

During small periods included in the result of using this type of means of sample and hold in the feedback signal may be injected error. During small periods activate when the signal 510 is made by means of sample and hold only for a short time, the means 19 sampling and storage is not enough time to charge to the desired level. This can cause a drop in signal 500 current feedback, and in response to this drop in the voltage Converter 12 will increase its output. When the current passing through a chain of one or more light-emitting elements 15 can exceed the limit supported during large periods included who I am. This error may increase with decreasing time spent light-emitting element in the "on"state, and the current may rise further as a result of increasing the voltage of the voltage Converter. As described above, in accordance with the present invention can be performed as a means of controlling light intensity with the possibility to save the desired switched current passing through a chain of one or more light-emitting elements during the small periods of activation.

7 shows another variant of the device of excitation and control capable of performing the specified level functions. In particular, instead of applying the signal 140 changes in light intensity, as used in figure 2, which is proportional to the required level of peak current, you can use the signal to control the light intensity in the signal waveform 150 switching logic level together with the switching means 800 and the resistor 40 to provide a means of changing the light intensity of the lighting installation. Signal 240 is a fixed reference voltage proportional to the desired peak current. On Fig depicting a special variant of the device shown in Fig.7, to control the light intensity is switched on and off high-speed anal the final switch 44. When the switch 44 is on, the resistors 43 and 40 act as a voltage divider that can be set to a higher value than the reference voltage generated by the resistors 41 and 42, which will be able to ensure that operational amplifier 17 will transfer switching means 13, for example, the switch FET in the off state, preventing the passage of current through a chain of one or more light-emitting elements 15. When the switch 44 is turned off, this switching means reaches a state of high impedance, and the signal 103 to the inverting input of the operational amplifier 17 is the current passing through the device 16 of the read current. For large periods of the enable circuit current feedback and voltage Converter 12 can maintain this level of voltage at the node 101, the signal 103 will be substantially lower than the maximum required current level set by the standard voltage is 240. Therefore, the operational amplifier 17 can switch the switching means 13 in a state of rigid inclusions" and the "hard off". In the variant shown in Fig, due to the configuration of the analog switch 44 periods of "on" and "off" light-emitting elements can be a addition signal 150 switching logic level. When the switching period is snijaetsa below a certain level, for example, about 10%, and the level of the output voltage at the node 101 increases, which may exceed the maximum current specified level, the operational amplifier 17 can reduce the voltage level applied to the gate of the switching means 13, therefore, the switching means to switch to soft mode, dissipating some power to limit the peak current. However, for very small periods include total average power dissipation will still be low. May require operational amplifier 17 worked with sufficiently high speed to effectively eliminate bursts of power or excessive growth of current passing through a chain of one or more light-emitting elements. However, the use of high-speed operational amplifier can cause unwanted reverberations or transients when switching. Specialists will be clear that to eliminate reverberations or transients when switching it is possible to enter, for example, the capacitor 51 and other components 50. These other components can be, for example, a decoupling capacitor and a damping device containing serially connected resistor and capacitor, to provide these desired features. For professionals as will be obvious, and other configurations of these components.

Figure 9, 10, 11 and 12 presents the schema of the pathogen light-emitting element of the blue spectrum, the first exciter light-emitting element, a green spectrum, the second exciter light-emitting element, the green spectrum and pathogen light-emitting element in the red spectrum, respectively, each of which is structurally designed in accordance with the present invention. These schemes will be essentially the same as described in connection with Fig, although the design of each scheme is considered a specific color light-emitting element.

On Fig and 14 show alternative versions of the present invention. For example, the signal 150 changes the intensity of light can be fed to the buffer 60, which energizes the switching means 13. The buffer turns the switch into a state of "hard on" and the "hard off" signal intensity for long periods of inclusion. At small periods of activation of the voltage level at the node 101 may become high, and the operational amplifier 17 can respond to the signal readout current when the signal is higher than the preset reference voltage 240. In this case, the buffer can be turned off and thereby to shunt the switching means in the off state. Voltage 102 reading may suddenly be adversely affected, isvav re-enable the buffer amplifier and the transfer switching means in the "on"state. If the operational amplifier, buffer and switch sufficiently fast, this Cycling between the States "on" and "off" can occur fast enough peak current did not significantly exceed the required reference level, but may have a slight ripple current levels. Specialists will be clear that to achieve adequate work may need to pathogen 61 of the switching means shown in Fig, made the switch change-over means rather quickly. In addition, may be required components 50 to reduce or eliminate reverberations or transients when switching. As these other components can be used, for example, a decoupling capacitor and a damping device containing serially connected resistor and capacitor, to provide these desired features. For professionals will also be obvious, and other configurations of these components.

On Fig and 17 show variations of the present invention without operational amplifier, but require additional switching components to replace some or all of the functions of the operational amplifier. Switching and readout means 950 responds to the high signal 340, which can serve as a tool is to bypass his reading means during large periods of activation. In addition, during the small periods enable switching and readout means 950 can respond to low signal 340, thereby forcing the current to pass through his reading means. These functions switching and readout means can provide the required level of functionality of the device excitation and control without integration, for example, the operational amplifier in the system. On Fig shows another variant of the design shown in Fig, in which the means to control the light intensity is located on the high-voltage side chain of one or more light-emitting elements.

Referring specifically to Fig, for long periods, enabling the switching means 46, for example, FET, can be activated by signal 340 to bypass resistor 43 read current to increase productivity and to ensure that the signal 150 changes in light intensity will be directly passed as an additional switching signal to the switching means 13 to the status of a "hard on" and the "hard off". At small periods include, for example, less than about 10%, the switching means 46 can be turned off, thus forcing the current to pass through the readout resistor 43. The voltage on this reading resistor 43 may kontrolirovat the change of the transistor 47, which can automatically reduce the actual gate signal 270, causing the FET 13 will pass only the desired peak current. The level of this peak current can be set depending on the ratio of the differential voltage on the readout resistor 43 in comparison, for example, with a typical voltage base-emitter voltage required for translation of the transistor in the "on"state. Therefore, when the feedback current begins to decrease, and the voltage level at the node 101 is increased sufficiently to cause an increase of the load current, the transistor 47 can start the transition to the enabled state, to adjust the switching means 13, directly limiting the current passing through a chain of one or more light-emitting elements. This again will be a power loss in the switching means 13 and reads the resistor 43 at small periods of activation. However, since this case can occur at small periods of inclusion, the average power loss can be relatively low.

In another embodiment of the present invention, illustrated in Fig, lighting installation with a device for excitation and control can be performed so that the anode of one or more chains of one or more light-emitting element which can be attached to the positive bus. In this configuration, the cathode of one or more chains of light-emitting elements is adjusted, and the anode of one or more chains of light-emitting elements connected to the positive bus. The voltage Converter 2000 made so that the anode of one of the chains of light-emitting elements was attached to the positive bus. The cathode of this chain is attached to the switching means 900 that can be used, for example, as a switch and linear transistor. Switching means 900 is then connected to the tool 910 read current. On the negative side, means 910 read current is regulated by the voltage Converter 2000. Differential amplifier means 920 shifts the voltage signal on the tool 910 read current so that its output clamp voltage is present, representing the current passing through the tool 910 read current. Operational amplifier 17 controls the switching means 900 on the basis of the output signal means 910 read current and signal 140 control the light intensity. Differential amplifier means 920 is attached to the circuit 19 sampling and storage, which receives the signal indicating the output signal means 910 read current, the circuit 19 sampling and storage transmits the feedback signal current in the Converter voltage is of 2000, providing input to the voltage Converter to change the output voltage, if required.

On Fig shows the installation diagram of the voltage Converter, which may be made with the possibility of integration in the lighting installation with a device for excitation and control depicted in Fig. Switch 611 and the inductor 613 are located on the negative bus, which in this configuration is adjusted. When the switch 611 is closed, current flows in the capacitor 614 and the load back through the inductor and the charge stored in the inductor 613. When the switch is open, the diode 612 moves and acts as a short circuit. When this current flows from the inductor 613 in the capacitor 614 and the load 615.

On Fig shows another variant of the present invention, in which the lighting system with the excitation device and the control is made so that the anode of two or more chains of light-emitting elements connected to the positive bus in accordance with a variant of the present invention. In this embodiment, the voltage Converter includes an integrated circuit 2500, capacitors 2510 and 2530, diode 2520, for example, a Schottky diode, inductor 2540, switch 2550, for example, the switch FET, and a resistor 2560. The host 2100 and the anode of a chain of one or more light-emitting elements are attached to positively the second bus, and the anode 2200 is regulated by the voltage Converter. Since the cathode of a chain of one or more light-emitting elements is adjusted, the device 16 of the read current is not connected to earth ground. Means for grounding voltage on the device 16, the read current is a differential amplifier 2340 together with associated resistors 2300, 2310, 2320 and 2330.

Also on Fig signal 150 switching logic level can be used together with switch 44 and resistor 43 to provide a means of changing the light intensity of the lighting installation. Signal 240 is a standard constant voltage, which is proportional to the desired peak current. The high speed switch 44 is switched on and off to control the light intensity. When the switch 44 is on, the resistors 43 and 40 act as a voltage divider that can be set to a higher value than the reference voltage generated by the resistors 41 and 42, which ensures that operational amplifier 17 will transfer switching means 13, for example, the switch FET in the off state, preventing the passage of current through a chain of one or more light-emitting elements 15. When the switch 44 is turned off, he reaches a state of high impedance and signal 103 to the inverting videoduration amplifier 17 is current, passing through the device 16 of the read current. For large periods of the enable circuit current feedback and voltage Converter can maintain the voltage level at the node 2200 such that the signal 103 is typically lower than the maximum required current level set by the standard voltage is 240. Therefore, the operational amplifier 17 can switch the switching means 13 in a state of rigid inclusions" and the "hard off". Depending on the configuration of the analog switch 44 periods of "on" and "off" chain of one or more light-emitting elements can be a addition signal 150 switching logic level. When switching period falls below a certain level, for example, about 10%, and the level of the output voltage at node 2200 is reduced if the peak current increased above the required threshold, the operational amplifier 17 can reduce the level of tension that he submits to the gate of the switching means 13, therefore, the switching means switches softly, dissipating some power to limit the peak current. However, for small periods include total average power dissipation can still be small.

In those embodiments, where many chains of light-emitting elements are excited by a single power source, components con is ur feedback schemes can be combined for all chains of light-emitting elements or groups, or may be separate components for each excited by a chain of light-emitting elements.

It is clear that the above variants of the invention are exemplary and can be made various changes. Such changes should not be considered as beyond the scope of claims of the invention, and all such modifications fall under the scope of the attached claims, as it will be clear to the experts.

1. The device excitation and control, to control the current supplied to the chain one or more electronic devices, containing a) a voltage Converter configured to receive the first voltage value from a power source, the voltage Converter configured to convert a voltage of the first magnitude in the voltage of the second magnitude in response to the control signal, b) the means of control of light intensity, is configured to receive the second voltage value and the control signal light intensity, and the means of control of light intensity is arranged to control the transfer voltage of the second magnitude in the chain based on the control signal changes the intensity of the light and control light intensity is performed with the opportunity to work in several modes, and the control signal light intensity decree which provides the desired mode of operation controls the light intensity, (C) means read current, connected in series with a chain and configured to generate a feedback signal indicating the current passing through the chain, and (d) feedback tool, electrically connected to the voltage Converter and a means of sensing current, and the feedback tool is configured to receive a feedback signal and generate a control signal based on the feedback signal, the feedback tool is additionally configured to provide a control signal to the voltage Converter, and control the light intensity is made with possibility of operation in the first mode, when the control signal changes the intensity of the light indicates that the switching period exceeds the specified threshold, and control the light intensity is made with possibility of operation in the second mode, when the control signal light intensity indicates that the switching period is below a predetermined threshold.

2. The device excitation and control of claim 1, wherein the specified threshold is 5 to 30%.

3. The excitation device and the control according to claim 2, in which the predetermined threshold is 10%.

4. The excitation device and the control according to claim 1, in which the control signal mod is using the light intensity shows a switching period and a reference voltage.

5. The excitation device and the control according to claim 1, in which the control signal light intensity shows a switching period, and the means of control of light intensity additionally responds to adopted them the signal of the reference voltage.

6. The excitation device and the control according to claim 1, in which the voltage Converter is a DC-to-DC (DC-DC Converter).

7. The excitation device and the control according to claim 6, in which the voltage Converter is selected from a group that includes a buck Converter, boost Converter, the intermediate booster Converter, Converter cook and flyback Converter.

8. The excitation device and the control according to claim 1, in which the tool of the read current is a fixed resistor, variable resistor, or inductor.

9. The excitation device and the control according to claim 1, in which the feedback tool includes a sample and hold.

10. The excitation device and the control according to claim 1, in which the chain has an anode and a cathode and in which the voltage Converter is configured to control electrical connection of the anode of the chain between the voltage Converter and the power source.

11. The excitation device and the control according to claim 1, in which the chains the ka has a high side voltage and the low voltage side, and the means of control of light intensity is electrically connected to the low voltage side of the chain.

12. The excitation device and the control according to claim 1, in which the chain has a high side voltage and the low voltage side, the control light intensity is electrically connected to the high-voltage side chain.

13. The method of controlling the current applied to the chain one or more electronic devices, comprising stages on which (a) make a selection of current passing through the chain, (b) adaptive transform voltage from the first voltage value in the voltage of the second magnitude in response to the feedback signal, showing the exposed sample current, (C) control supply voltage of the second value chain on the basis of the control signal light intensity, and control of adaptive change on the basis of the control signal light intensity, the management of the supply voltage of the second magnitude carried out on the basis of the first mode of operation, when the control signal changes light intensity shows that the switching period exceeds the specified threshold, and the control supply voltage of the second magnitude carried out on the basis of the second operation mode, when the control signal by changing intensive the STI light shows that period include below a predetermined threshold.

14. The method according to item 13, in which the predetermined threshold is between 5 and 30%.

15. The method according to 14, in which the predetermined threshold is 10%.



 

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3 cl, 16 dwg

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