Illumination device

FIELD: electricity.

SUBSTANCE: invention relates to lighting engineering. Illumination device (1) contains at least one light source (50) of low power; input power supply cascade (20) fit for receipt of low alternate voltage from an electronic transformer (ET); buffer power supply cascade (30) having input (31) connected to output (29) of the input power supply cascade; excitation circuit (40) intended for excitation of light and receipt of power supply from the buffer power supply cascade. The input power supply cascade generates output current pulses in order to charge the buffer power supply cascade at relatively low frequency, and during each output current pulse the input power supply cascade consumes input current, output current always has current value bigger than the required minimum load for the electronic transformer.

EFFECT: reducing light blinking by improving compatibility between light sources and electronic transformer.

15 cl, 8 dwg

 

2420-184574RU/018

The LIGHTING DEVICE

The technical field TO WHICH the INVENTION RELATES

The present invention generally relates to lighting.

The LEVEL of TECHNOLOGY

In lighting, we have developed many different types of light sources. Depending on the application of each type of light sources may have specific advantages and disadvantages. In any case each type of light sources has specific specifications, and sources of power (or agents) for such light sources have been developed to meet your specific specifications.

A recent development is a light emitting diode (LED) high power as light source for lighting purposes. Although, of course, were designed and developed schemes for excitation illumination devices that use LED as light sources, there is also a desire to use LED as a replacement for light sources in existing lighting devices (embedding in existing equipment), when the electrical input to the lamp is formed by the existing circuit adapted to meet the specific specifications of existing (not LED) light source. This leads to some problems and/or difficulties.

Disclosure of the INVENTION

The present invention, in particular, has� attitude to the problem of embedding into existing equipment in the case of low-voltage lamps, such as halogen lamps, for example, halogen lamps MR16, 12V socket GU5.3; alternative examples - lamp MR11 or configuration with G4 or G9. However, the principles of the present invention, as to the possibility of adjusting the brightness, can also be applied in the case of lamps, electric powered.

In the case of low-voltage lighting systems normal mains voltage (generally AC voltage 230 V, frequency 50 Hz in Europe) is converted into a safe low voltage. Most of the transformers used for this purpose, implemented as electronic power supplies with the ability to switch modes, operating at a relatively high switching frequency higher than the mains frequency, a higher frequency results in smaller size of the transformer. The problem is that this type of transformer has difficulties when combined with an LED. Typically, the transformer may not be stable, resulting in flickering light.

The purpose of the present invention is to overcome or at least reduce these problems.

In particular, the present invention aims at improving the compatibility between LED and electronic transformers.

In particular, the present invention aims at providing a lighting device comprising one or more LED as light sources and capable of reliable work together with electronic transformers.

The present invention is based on the fact that the electronic transformer requires a minimum load (minimum output current) to work properly, and that the LED may not be able to provide a minimum load. Typically, the minimum load electronic transformer in the range from 20 W to 60 W, while LED, as a rule, have a much lower load (low power which is actually considered as an important advantage and LED, in the first place, is an important reason of using them to change lamps (high power).

One important aspect of the invention, the driving circuit of LED according to the present invention is provided with an input cascade power buffer and a cascade of power. Input power suitable for connection with a standard electronic transformer and is arranged to consume relatively short current pulses of a high level, that is shorter than the period of the mains. Between these pulses of current from the transformer is not consumed, thus, the current transformer can be considered disabled. During the pulses the current level is high enough to meet the requirements of minimum load electronic transformer. Buffer amp supply is designed for buffering electric�th power, consumption of electronic transformer. The circuit LED is powered by a buffer stage of the power supply and load is relatively low power for buffer stage of the power. On average, the power consumed from the buffer stage power circuit LED, should be offset by the power consumed from the input stage of the power buffer stage power: this is done by appropriate adaptation of the work cycle high-current pulse level.

Thus, the circuit in accordance with the present invention has a two-stage configuration. The first stage is made to meet the load requirements of the transformer of the power source, while the second stage is arranged to provide power to the LED in accordance with the requirements of the power LED. Additional helpful features mentioned in the dependent claims.

It should be noted that the document WO2009/079924 discloses a drive circuit of the LED, the host supply voltage 12 V alternating current (AC), which, for example, is provided from halogen transformer. This circuit contains a rectifier and a buffer capacitor, a rechargeable peak input AC voltage of 12 V. In the case of low consumption power LED this control scheme so�e will require only a low current transformer. In any case, an important disadvantage of the solutions of the prior art is that the peak current in the lamp is not determined, and that the peak current drawn from the transformer, not defined, and thus the current drawn from the transformer, may be either too low or too high for proper operation of the transformer.

BRIEF description of the DRAWINGS

These and other aspects, features and advantages of the present invention will be further clarified by the following description of one or more preferred embodiments with reference to the drawings, in which identical reference position indicate identical or similar parts.

Fig.1 shows a block diagram of the lighting device implemented in accordance with the present invention;

Fig.2 is a block diagram illustrating the input stage of the power supply and buffer amp power;

Fig.3 is a graph schematically illustrating several curves of voltage and current;

Fig.4 schematically illustrates an led lamp in accordance with the present invention;

Fig.5 is a block diagram illustrating a drive circuit of LED;

Fig.6A-6C is a block diagram illustrating the change of the lighting device shown in figure 1.

The IMPLEMENTATION of the INVENTION

Fig.1 schematically shows a block diagram of the lighting device 1, �realizowanego in accordance with the present invention, United electronic transformer ET, which, in turn, is connected to the grid M. the lighting Device 1 has a configuration with three cascades, containing the input stage 20 of the power buffer amp 30 power, cascade 40 schematic of the excitation LED, and, finally, one or more LED 50. As will be explained in more detail, the main task of the input stage 20 of the power is to save the completed buffer 30 with regard to the requirements of the source, in particular, transformer ET, while the main task of the circuit 40 excitation is to excite the LED power received from the buffer, subject to the requirements of the LED. Thus, even if such requirements may mutually interfere, they don't "collide" as they are expressed in different ways of current. In steady state the buffer 30, the feeding is on average constant. In one specific implementation, the control scheme determines the LED: for example, in the case of the brightness control sets the power LED that indicates the speed at which the power is taken from the buffer, and the task input power is to be used to monitor and adapt your speed to fill the buffer. In another specific implementation, the control scheme determines the power: for example, if the brightness control is set to power� outlet, defines the rate at which power is injected into the buffer, and the task of the cascade scheme of the excitation LED is to be used to monitor and adapt your speed buffer underrun and therefore the power LED.

Circuit 40 LED has an input 41 of the power coupled to the output 39 of the power buffer stage 30 power. The circuit 40 excitation LED can be a standard auxiliary circuit of the prior art without the need for special adaptation, so further description thereof is omitted here. For example, any circuit, capable of operating correctly when the input 41 is connected to the power source DC voltage to a suitable voltage level may be used as the circuit 40 excitation.

Buffer amp 30 power, which can, as a rule, contain one or more of the capacitors has an input buffer 31 connected to the output 29 of the power input stage 20 power, which, in turn, has a power coupled with an electronic transformer ET. As for the architecture, the lighting device 1 is preferably implemented as a complete lamp unit that includes a connector 10 of the lamp for connection to a standard connector socket CS connected to the output transformer. However, it is also possible that use standard units to� lamp, the combination of the lamp 50 and the circuit 40 excitation, this unit is provided with a lamp connector similar to the connector 10 of the lamp and is able to join the connector CS, and that the combination of input stage 20 of the power supply and buffer stage 30 of the power supply is implemented as an intermediate device 60 supply is provided at its input connector of the lamp, similar to the connector 10 of the lamp and is able to join the connector CS, and provided at its outlet standard socket connector, similar to the nest of CS.

Fig.2 is a block diagram illustrating some aspects of the input stage 20 of the power supply and buffer stage 30 power in some additional detail.

Buffer amp 30 food usually contains a capacitor 32 connected in parallel with the outputs 38, 39.

Input stage 20 power, which may contain a rectifier 22, preferably implemented as an inverter. Fig.2 illustrates the configuration of a boost Converter, but the input stage 20 of the power may also be implemented as penygawse-boost Converter, the Converter with asymmetrically-loaded primary inductor (SEPIC), etc.; in all these implementations, it is possible to obtain the output voltage (and, thus, the operating voltage buffer stage 30 power), higher than the output voltage of the battery�of matora ET. In the shown embodiment of the input stage 20 power contains the sequential arrangement of the coil inductance 26 and diode 27, located between the entrance 21 (or rectifier 22) and exit 29. Managed switch 23 is connected in parallel with the output terminals 28, 29 at the node between the coil inductance 26 and a diode 27. The control device 24 controls the controllable switch 23, so he was either in a conducting (on) or non-conductive (off) state.

The work is as follows. When the switch 23 is turned on, the transformer provides a current of increasing magnitude, which is used to charge the coil inductance 26. When the switch 23 is turned off, the coil 26 of the inductance on the capacitor provides 32 current with decreasing magnitude, causing energy transfer from the coil 26 of the inductor to the capacitor.

The operation will be explained in more detail with reference to Fig.3 is a graph showing the shape of some signals. The control device 24 switches the switch 23 with a relatively high frequency (Fig.3, curve 41). As should be clear to the specialist in the field of engineering, achieved the output voltage depends on the operating cycle of this high-frequency switching. Fig.3 also shows the output voltage of the transformer ET, �about is the input voltage V infor input stage 20 power (curve 42). Current IETconsumed from the transformer (curve 43), usually proportional to the current in the coil inductance 26, if only at the input 21 is not used, the filter capacitor, and then the ripple current of the inductor would be ironed out in the current of the transformer. The control device may be configured to provide a proportional output current to input voltage, but it is also possible that the control device is configured to maintain the output current constant (though perhaps with a certain degree of high-frequency fluctuations).

The control device 24 is configured to perform interleaving on a relatively low frequency between mode switching and mode "off", that is to alternate periods of high-frequency switching with periods during which switching occurs, and the switch 23 remains off. The control device 24 remains in its switching mode during the first duration t1 and remains in the "off" mode during the second duration t2, and thus the total switching period T=t1+t2. The duty cycle D for low frequency switching is defined as t1/T.

As for transformer ET, it is pulled in a duty cycle D, that is, he is in�conducted by the alternation between periods he loaded (t1), and the periods in which it is not loaded (t2). During the periods in which it is loaded (t1), transformer ET provides a relatively high current, having a magnitude of IETalways higher than the minimum load Iminelectronic transformer. In this respect it should be noted that different types of transformers can have different values for minimum load requirements. The lighting device 1 can be made to work with a specific type of transformer with the given minimum load requirements associated with this particular type of transformer, but it is also possible that the lighting device 1 is made to work with many types of transformers, and then the lighting device 1 may take into account the highest value from a set of known minimum load requirements associated with different types of transformers.

As mentioned above, the input stage 20 of the loaded power buffer stage. Assume that the power LED is defined in the scheme of the excitation LED. For example, the circuit 40 excitation LED has a user input (not shown) to allow the user to adjust the brightness of the LED 50, or as separate instances and/or types of LEDs have different current requirements under the conditions �though power. As to the circuit 40 excitation LED, the buffer 30 operates as a constant voltage source, and the circuit operates autonomously, as usual. It should be noted that the circuit 40 excitation LED can perform an operation cycle to vary the intensity of the LED light output (brightness). Thus, it may happen that the power required by the circuit 40 excitation is changed. The circuit 40 excitation LED, therefore, determines the level of the output buffer 30. In particular, when the led operates in a state with a reduced brightness average power consumption of LED is low, and thus, the average power is taken from the buffer 30 is low. Input stage 20 power must compensate for this by adapting its output, i.e. the level of input power to the buffer 30. The criterion for the correct settings is that the buffer remains on average constant. This can be assessed by measuring the voltage buffer. To this end, in this embodiment of the input stage 20 of the power supply may further comprise a sensor 25 voltage, measuring the output voltage of the input stage 20 power, which largely corresponds to the voltage on the capacitor 32. Alternatively, it is also possible that the buffer cascade 30 feed� contains the sensor output voltage, feeding the measured signal back to the input stage 20 of the adapter. In any case, the control device 24, which, for example, may be implemented as suitably programmed microprocessor, controls bronirovanie switch 23 so as to maintain the measured voltage is substantially constant at least on average over a sufficiently large time, as should be clear to the specialist in the field of technology.

Thus, the control device 24 adjusts its duty cycle D in such a way as to maintain the voltage in the buffer 30, and this means that the average energy taken from the transformer ET, monitors the average energy consumed by the LED. It should be noted that the switching frequency of the circuit 40 excitation and control device 24 and workflows used in the circuit 40 excitation and the control device 24, are mutually independent: the behavior of the current on the side of the entrance is separated from the behavior of the current on the output side.

It should be noted that the control device may apply different control schemes that can alternate between a mode switch and mode "off". For example, it is possible that the control device 24 decides to switch its mode only on the basis of the sensor 25 output voltage: the control device 24 is included in �mode switching, when the control device 24 determines that the output voltage has fallen below a predefined first threshold, and enters the "off" mode when the control device 24 determines that the output voltage has reached a predefined second threshold above the first threshold; in this case, change the full period T of the switch. However, preferably, when the control device 24 operates in synchronization with an output voltage of the transformer ET, as shown: the control device 24 is included in a switching mode when the first phase value, e.g., zero crossing, and is in the "off" mode, when the output voltage has reached a predefined threshold; in this case the full period T of the switch will be permanent. It is possible that the control device 24 is included in the switching mode two or more times during the period of the input voltage, but preferably, when the control device 24 is included in the switching mode only once during the period (or during the half period) of the input voltage.

Fig.4 schematically illustrates a preferred physical implementation of a lamp unit 100 according to the present invention, containing the first part 110 of the housing that houses the electronic circuits 20, 30, 40 circuits of excitation and from the residence which� the connecting pins 111 for connection to the socket, and the second part of the housing containing one or more LED.

In the above explanation it was assumed that the grid M and the electronic transformer ET deliver a fixed capacity, and that the brightness of the LED 50 is regulated by the circuit 40 excitation LED. In this case, when the user operates the circuit 40 excitation LED to reduce the power consumption of the LED 50, and therefore reduces the power required by the circuit 40 excitation 40 LED, the control input 20 of the power supply controls the power consumed by the input cascade 20 power from the power source so that the input power of the lighting device is adapted to output power of the lighting device. In the equilibrium condition of the average amount of power transferred from input stage 20 of the power buffer amp 30 power, equal to the average amount of power transferred from the buffer stage 30 of the power supply circuit 40 excitation LED. However, it is also possible to use a known regulated power supply so that the power LED is determined by the setting of the power outlet. Unlike the previous embodiment, the speed of the power input to the buffer 30 is the lead and is directed by the power source. In particular, when the power supply operates in a state with reduced power, the average power supplied to the buffer 30 is �iskai. The circuit 40 excitation LED must compensate for this by adapting power, which it retrieves from the buffer, and therefore adapt their output power. This means that the output power LED should be adapted to the power provided at the input. The criterion for the correct settings is that the content of the buffer is maintained, on average, constant. This can be estimated by measuring the voltage buffer. Fig.5 is a block diagram illustrating an implementation option of the circuit 40 excitation LED, and provides a relatively easy solution for this requirement.

In this embodiment of the sensor 45 voltage can be connected at the input 41 and, thus, perceives the input voltage of the circuit 40 excitation, which largely corresponds to the output voltage of the buffer stage 30 power. Alternatively, it is also possible that the buffer cascade 30 power contains the sensor output voltage, supplying the measured signal in the circuit 40 excitation.

Fig.5 illustrates the circuit 40 excitation LED as a buck Converter, but also other configurations are possible. In the illustrated embodiment of the circuit 40 excitation LED contains the sequential arrangement of the managed switch 43 and the coil inductance 46, connected between the input�41 and the LED 50. The diode 47 is connected in parallel with the LED 50 to the node between the switch 43 and the coil inductance 46. A controllable switch 43 controls the device 44 of the control, which, for example, may be implemented as suitably programmed microprocessor, that he was either in a conducting (on) or non-conductive (off) state. The sensor 45 voltage generates a measured signal for the device 44 of the control, which controls bronirovanie switch 43 so as to maintain the measured voltage is substantially constant at least on average over a sufficiently large time, as should be clear to the specialist in the field of technology. Since step-down converters are well known, a detailed description of their operation are omitted here. Suffice it to say that the power obtained from the buffer stage 30 power depends on the duty cycle, which switches managed switch 43, and that the duty cycle determines the average LED current and therefore the average power supplied to the LED. In equilibrium, when the duty cycle is properly installed so that the output voltage of the buffer stage 30 of the power measured by the sensor 45 of the voltage is constant, the power obtained from the buffer stage 30 power, Rav�and the amount of power, provided input cascade 20 power, and the amount of power in LED, equal to (if not losses) or, at least, in proportion to the amount of power provided by power source M, ET at reduced power. In fact, the brightness of the LED 50 is controlled through adjustment of the power outlet.

Relative to the device 44 of the control it should be noted that several possible implementations. The output voltage of the buffer stage 30 LED has some high-frequency ripple, thus, the device 44 may be provided with a filter for filtering ripple and for medium version output voltage buffer stage. It is also possible that the device 44 of the control in a special way supports minimum peaks or maximum peaks of the output voltage buffer stage permanent. The controller itself may be of any type from P, PI, PID, or other linear controller filter or a nonlinear controller. In the preferred implementation, the controller is a nonlinear controller gain to low gain, when the voltage of the buffer close to the specified value, and with high gain, when the voltage of the buffer away from the setpoint. The latter occurs when the arm is dimming fast turns, in which case you want fast�th response of the control loop.

Fig.6A is a block diagram comparable to Fig.1, which schematically illustrates a further development of the lighting device 1, which is particularly useful in combination with the variant of implementation, are discussed in relation to Fig.5. Fig.6B is a block diagram comparable to Fig.5, which shows additional details of the circuit 40 excitation LED in this variant of implementation, while Fig.6C is a block diagram comparable to Fig.2, which shows more details of input stage 20 of the power in this variant implementation.

It should be noted that Fig.6B shows the configuration of the circuit 40 excitation of Fig.5, but this is not essential. Here it is shown that the device 44 of the control may include a differential amplifier receiving the first reference voltage Vref1 to the not inverting input and receiving the output signal of the sensor 45 of the voltage at inverting input. The control switch 43 will be such that (on average) of the detected voltage is equal to a reference voltage, therefore the voltage of the buffer will be permanent. In this embodiment, the implementation of Fig.6A-C, the lighting device 1 includes a circuit 60 feedback, the input signal representing the LED current back into the input stage 20 of the adapter. As shown in Fig.6B, the circuit 60 feedback to this end includes a sensor 61 current made in�the possibility to register the output LED current of the circuit 40 excitation LED and provide a sensor output signal on bus 62 registration. As shown in Fig.6C, the tire 62 of the register is connected to the input device 24 of the control.

The control device 24 is arranged to control the switch 23 so that the average input current of the input stage 20 of the power consumed from the power source (i.e. electronic transformer (ET) is substantially constant. Set value for this current is predetermined and stored in the memory device 24 of the control on the basis of factors relevant to the nominal conditions 50 LED (or multiple LEDs), which developed the device 1. If the brightness of the LED is reduced, the led is working in nominal conditions, which can also be called "full power". Under this condition, the "full power" LED 50 requires some nominal LED current and consumes nominal power. Assuming for simplicity that there is no loss, this rated power of LED in equilibrium must be equal to the (average) input power received by the input cascade 20 power from the power source. However, although the control device 24 can determine the input current of the input stage 20 of the power supply, input voltage is determined by the output voltage of the power source (i.e. electronic transformer ET). Practically, the output voltages of individual instances of such sources�, even when they have the same type, may vary within a certain tolerance, and can even vary with time and/or operating conditions such as temperature. Consequently, the input power may depend on the power source within a certain tolerance range. Without circuit 60 of feedback that would easily translate how changes power LED, especially in this variant of implementation, which is illustrated in Fig.5. In a variant implementation of Fig.6A-6C, the control device 24 can compensate for such tolerances power source by setting the working setpoint for the average input current input 20 power based on the measured current of the LED so that the LED current remains constant (equal to the reference value stored in the component memory device 24 controls). In other words, neglecting the losses of the input current is adapted to the input voltage so that the input power equals output power. Fig.6C, the control device 24 is illustratively shown as comprising a differential amplifier 24a, the host bus 62 registration of its inverting input. Mentioned specified value is represented as a reference signal Vref2, filed on not inverting input of the amplifier. Ignoring unit 24b, which will be discussed later, �the Board switch 23 will be what (on average) perceived the current will be equal to the specified value, represented as Vref2.

It should be clear that the effect is that the output LED is independent of the average voltage of the power supply even if the power supply will be regulated. This is not a problem in cases where the possibility of dimming is not applied. To combine the advantage of tolerance compensation with the advantage, that the brightness control, the control device 24 may be arranged to have a limited range of freedom to set a working set value for the average input current, for example, between plus and minus 10% of a predefined fixed set value. As a result, the LED will "obey" the deliberate adjustment of brightness through power source with the "delay" depending on the above-mentioned range. For example, suppose that with the full power electronic transformer ET provides the output voltage is 5% higher than the nominal configuration. The control device 24 compensates by lowering the set value of the input current by 5% relative to a predefined fixed set value. Now suppose that the power electronic transformer ET is reduced. The control device 24 responds velicina.stanovi values of the input current, so that the output power of the LED remains constant. When the power electronic transformer ET reduced by 15%, the set value of the output current is 10% higher than a predefined fixed set value. Only when the power electronic transformer ET is reduced further, the set value of the input current is kept constant (10% higher than a predefined fixed value, and the power output of the LED decreases.

In summary, the present invention provides a lighting device 1, containing:

at least one source 50 of light low power;

input stage 20 power, suitable for receiving a low AC voltage from an electronic transformer ET;

buffer amp 30 power having an input 31 coupled to the output of the input stage 29;

the circuit 40 excitation for the excitation light source and receiving power from a buffer stage.

Input stage supply generates pulses of output current for charging buffer stage power at a relatively low frequency, and for each pulse output current input stage consumes power input current input stream always has a current value higher than the minimum load electronic transformer.

Although the invention has been illustrated and described �for details on the drawings and in the foregoing description specialist in the field of technology should be understood that such illustration and description should be considered illustrative and not limiting. The invention is not limited to the disclosed variants of implementation; on the contrary, several changes and modifications are possible within the protective scope of the invention defined in the attached claims.

For example, the input unit 20 of the power supply and buffer amp 30 power can be combined in one unit.

It's also possible to have an implementation option, which implemented the control mechanism shown in Fig.5 and 6, and the control mechanism shown in Fig.3, although during operation of one mechanism may receive a higher priority than another, for example, through a user selection.

Furthermore, although the invention has been described for the case of LED, the principles of the present invention is also useful for providing power to any source of light low power from low-voltage transformer.

Other modifications of the disclosed embodiments can be understood and implemented by experts in the field of technology in the practice of the claimed invention on the basis of a study of the drawings, disclosure and appended claims. In the claims the word "contains" does not exclude other elements or steps, and use the single�th does not exclude many. A single processor or other unit may fulfill the functions of several elements described in the claims. The fact that some tools are described in mutually different dependent claims does not indicate that a combination of these means may advantageously be used. Any notation for references in the claims should not be construed as limiting the scope.

The present invention was explained above with reference to block diagrams, which illustrate functional blocks of the device according to the present invention. It should be understood that one or more of these functional blocks may be implemented in hardware, with the function of such functional block is performed separate hardware components, but it is also possible that one or more of these functional blocks are implemented in software, and thus, the function of such functional block is performed by one or more software threads of a computer program or a programmable device such as a microprocessor, microcontroller, digital signal processor, etc.

1. The device (1) lighting that contains:
at least one source (50) of light low power;
the input stage (20) power having an outlet (29) and having an input (21), �odpadami for receiving AC low voltage from an electronic transformer (ET), with electronic transformer (ET) has the minimum load requirements (Imin);
buffer amp (3 0) power having an input (31) and the outlet (39) of power, and the input (31) of the buffer stage is connected to the output (29) of the input stage;
circuit (40) excitation for the excitation source (50) of light, and the circuit has an input (41) of the power coupled to the output (39) of the power buffer stage to accept the power buffer stage (30) food;
moreover, the input stage (20) power configured to perform interleaving on a relatively low frequency between the treatment current to provide an output current to charge the buffer stage (30) power and mode "off", during which the output current is not generated;
moreover, in the mode of the current input stage (20) of the power supply is arranged to consume the input current, the input current always has a current value higher than the minimum load requirement.

2. The lighting device according to claim 1, wherein at least one source (50) of light low power contains a light emitting diode (LED), and/or in which the buffer stage (30) supply provides a substantially constant output voltage, and/or in which the buffer stage (30) the food contains at least one capacitor (32).

3. Mouth�eusto lighting according to claim 1, wherein the circuit (40) of the excitation is made with the possibility of excitation source (50) of light constant current, and in addition:
circuit (40) excitation can be performed with the ability to adjust the brightness of the source (50) of light by changing the magnitude of the DC;
and/or
circuit (40) excitation can be performed with the option to generate a pulsed lamp current is always the same value, and a circuit (40) excitation is arranged to adjust the brightness of the source (50) of light by changing the duty cycle of current pulses.

4. The lighting device according to claim 1, wherein the input stage (20) contains the power Converter with switchable modes.

5. The lighting device according to claim 4, wherein the input stage (20) of the power supply contains a step-up Converter, penygawse-boost Converter or inverter with asymmetrically-loaded primary inductor (SEPIC).

6. The lighting device according to claim 4, wherein the input stage (20) of the power supply is arranged to switch from the mode of formation of the current in the "off" mode and/or mode to "off" in the mode of formation of a current in synchronization with an input voltage taken at its inlet (21).

7. The lighting device according to claim 4 or 6, in which the input stage (20) power is additionally provided with a sensor (25) and for�measurement of the voltage buffer stage (30), and in which the input stage (20) of the power supply is arranged to switch from the mode of formation of the current in the "off" mode and/or mode to "off" in the mode of formation of the current in response to the measured signal from the sensor (25).

8. The lighting device according to claim 7, further comprising a device (24) to control the switching of the input stage (20) food in such a way as to maintain the measured voltage of the buffer, on average, substantially constant.

9. The lighting device according to claim 4, wherein the generating mode power Converter switches at a relatively high frequency.

10. The lighting device according to claim 1, wherein the circuit (40) excitation includes means (44, 45) control the LED current, is arranged to control the LED current so that the output voltage buffer stage (30) remains substantially constant.

11. The lighting device according to claim 10, wherein the device further comprises a circuit (60) current feedback LED feed back to the input stage (20) to supply a signal indicating the LED current, and the input stage (20) the power includes means (24) control input current, receiving the said signal and arranged to control the input current of the input stage (20) supply so that the LED current does not depend on changes n�voltage power.

12. The lighting device according to claim 11 in which the said means (24) the input current is configured to compensate changes of the supply voltage only within a predefined tolerance range.

13. Block (100) lamp that contains a solid body (110, 120), having connection terminals (111) and enclosing the lighting device in accordance with any one of the preceding paragraphs.

14. Method the excitation source (50) light, comprising stages on which:
provide input stage (20) power having an outlet (29) and having an input (21) suitable for receiving AC low voltage from an electronic transformer (ET), with electronic transformer (ET) has a minimum requirement of load (Imin); and the input stage (20) power configured to perform interleaving on a relatively low frequency between the current formation for the formation of the output current to charge the buffer stage (30) power and mode "off", during which the output current is not formed; and wherein in the generating mode current input stage (20) of the power supply is arranged to consume the input current, the input current always has a current value higher than the minimum requirements of the load;
provide a buffer amp (30) power having an input (31) and the outlet (39) power�and, moreover, the input (31) of the buffer stage is connected to the output (29) of the input stage;provide circuit (40) excitation for the excitation source (50) of light, and the circuit has an input (41) of the power coupled to the output (39) of the buffer stage of the power supply to receive power buffer stage (30) power, wherein the output of the circuit (40) connected to the excitation source (50) of light;
enable circuit (40) excitation to determine the average LED current;
adapted the control input (20) of the supply so that, on average, the contents of the buffer (30) power remains constant.

15. Method the excitation source (50) light, comprising stages on which:
provide input stage (20) power having an outlet (29) and having an input (21) suitable for receiving AC low voltage from an electronic transformer (ET), with electronic transformer (ET) has a minimum requirement of load (Imin); and the input stage (20) power configured to perform interleaving on a relatively low frequency between the treatment current to provide an output current to charge the buffer stage (30) power and mode "off", during which the output current is not generated; and in the mode of formation of the current input stage (20) food is made with the ability to consume I�ne current in this case the input current always has a current value higher than the minimum requirements of the load;
provide a buffer amp (30) power having an input (31) of the power supply and the output (39) of power, and the input (31) of the buffer stage is connected to the output (29) of the input stage;
provide circuit (40) excitation for the excitation source (50) of light, and the circuit has an input (41) of the power coupled to the output (39) of the power buffer stage to accept the power buffer stage (30) power, wherein the output of the circuit (40) connected to the excitation source (50) of light;
provide the opportunity for the input stage (20) the power to determine the average LED current;
adapted the control circuit (40) of the excitation in such a way that, on average, the contents of the buffer (30) power remains constant.



 

Same patents:

FIELD: electricity.

SUBSTANCE: invention relates to lighting. Result is ensured by that the lighting device contains multiple LEDs connected in series. In the lighting device the first set of LEDs has first type LEDs, having first output of the light flow decrease as first function of the junction temperature. The second set of LEDs has second type LEDs having second output of the light flow decreased as second function of their junction temperature that differs from the first function. At least one first type LED and one second type LED are connected in parallel to the resistors set with resistance depending on the temperature. The resistance temperature dependence stabilizes ratio of the first light flow output to the second light flow output at different junction temperatures of the first set of LEDs and second set of LEDs.

EFFECT: prevention of change of ratio of light flow output of various types LEDs as part of same lighting device.

13 cl, 11 dwg

FIELD: electricity.

SUBSTANCE: invention relates to lighting engineering. Lighting installation (1) comprises input pins (2) for connection to alternating current (AC) network; a circuit (10) of light-emitting diodes (LED) connected in series with input pins; rectifier (30) with input pins (31, 32) connected in series with LED circuit, controllable voltage source (40) with input pins coupled to output pins of the rectifier; in-series assembly of at least one auxiliary LED (51) and the second ballast resistor (52) coupled to output pins of the controllable voltage source. Voltage source comprises in-series assembly of the fist controllable resistor (46) and the second resistor (47) coupled in parallel to input pins; controllable semiconductor stabilitron connected in parallel to output pins, which has input pin (48) connected at connection point between two resistors; at that positive output pin is connected to positive input pin while negative output pin is connected to negative input pin.

EFFECT: simplified regulation of the device in regard to luminous power and luminous efficiency shift to lower colour temperature.

7 cl, 2 dwg

Led circuit // 2550496

FIELD: electricity.

SUBSTANCE: invention relates to lighting engineering. In LED circuits (1) comprised of in-series first and second circuits (11, 12) with the first and second LEDs; the third circuits (13) are connected in parallel to the second circuits (12) to control the first LEDs in the first circuits (11) and /or third LEDs in the fourth circuits (14). The LED circuit (1) receives supply voltage from a power supply source (2, 3) supplying the LED circuit (1). The third circuit (13) receives supply voltage from the second circuit (12) supplying the third circuit (13). Supply voltage may be represented as voltage in the second circuit (12). The third circuit (13) may control the second LEDs in the second circuit (12) additionally. The above control may contain control unit for current passing through the above LEDs in order to turn light down, suppress light blinking, to adjust light and/or to protect overheating.

EFFECT: improving control efficiency.

13 cl, 5 dwg

FIELD: electricity.

SUBSTANCE: invention relates to lighting engineering. An excitation circuit of LED with adjustable brightness includes a resonant DC/DC converter connected to a resonant circuit. The converter includes a half-wave or double-wave switching circuit connected to the resonant circuit. An output signal of the resonant circuit is rectified and supplied to an output circuit. The output circuit can contain at least one series or shunting LED switch for switching on and off a LED unit. The control circuit controls switches of the switching circuit with a variable switching frequency and is configured to control the switching circuit for amplitude modulation of the converter and for pulse-width modulation of the converter with the first frequency of pulse-width modulation that is lower than the switching frequency. The control circuit can be additionally configured to control switching of the LED switch with the second frequency of pulse-width modulation that is lower than the switching frequency.

EFFECT: providing deep brightness adjustment with stable control of a working cycle of pulse-width modulation.

10 cl, 7 dwg

FIELD: electricity.

SUBSTANCE: invention is related to the area of lighting engineering. The LED device comprises several parallel branches of one or more in series light-emitting diodes through which in the operating state the respective portion of operating current passes through the LED device and a current source to supply operating current. The circuit is made to identify the biggest partial current and the operating parameter ensured by the current source on the base of this biggest partial current and to regulate it so that non of partial currents exceeds the preset maximum current.

EFFECT: more reliable operation of the device.

15 cl, 1 dwg

FIELD: electricity.

SUBSTANCE: invention relates to lighting engineering. The device comprises a current controller configured to receive dimming input signal, which is a variable showing the percentage of maximum excitation current supplied to LED load and to output a signal with pulse-width modulation (PWM signal) and reference voltage, a current transducer configured to receive voltage supply and to ensure output current and a shunt switch connected to the current controller and current transducer and between the current controller and LED load. The shunt switch is configured to divert at least part of the output current from the current transducer and from delivery to the LED load when the shunt switch is conducting, at that the shunt switch is not conducting when the dimming input signal shows that the percentage exceeds the threshold level.

EFFECT: improving efficiency of LED current control based on dimming input signal.

14 cl, 3 dwg

FIELD: electricity.

SUBSTANCE: invention is related to a light fixture containing light sources placed at least in the first group of light sources and in the second light sources, at that the above first and second groups of light sources are controlled separately. Light-collecting facilities collect light from the first group of light sources and convert it to beams of light sources. The light sources and light-collecting facilities are placed in the body emitting beams of the light sources. The body includes a coating containing at least one dissipating area and at least one non-dissipating area. The dissipating area receives light generated by the second group of light sources and dissipates it. Beams of the light sources pass non-dissipating areas without light dissipation.

EFFECT: development of new design for the light fixture.

13 cl, 11 dwg

FIELD: electricity.

SUBSTANCE: invention relates to lighting engineering. The lamp unit (100) with plurality of light sources (120a-e) is controlled by the control unit (110) designed to control a sequence of excitation settings (Sa-e) for the plurality of light sources based on switching signal (Sk) delivered to the lamp unit. The control unit is made so that it sets valid excitation settings in the preset way depending on time elapsed between the signal deactivation and repeated activation. Within limits of the first preset time interval the subsequent excitation setting is used for the light sources, upon the second preset time interval the previous excitation setting is used for the light sources, and within limits of the intermediate time interval between ending of the first preset time interval and ending of the second preset time interval the preset excitation setting is used.

EFFECT: improved quality of colour settings for the lighting system.

15 cl, 6 dwg

FIELD: electricity.

SUBSTANCE: invention is related to the sphere of lighting equipment. System of coded warnings uses a module (320) for signal detection and module (330) for signal generation, at that the detection module is configured to receive data related to detection of one or more operational parameters of the lighting device while the generation module generates the required warning signal (331) selected from a variety of warning signals upon detection of anomaly in one or more operational parameters. Each warning signal out of the variety of warning signals specified the specific abnormal operational parameter or the known combination of the specific abnormal operational parameters.

EFFECT: more reliable operation of the lighting devices.

16 cl, 9 dwg, 1 tbl

FIELD: electricity.

SUBSTANCE: invention relates to lighting engineering. The light assembly (10) used for a lantern (1), in particular, for lighting of roads and/or streets has adjusted light distribution. The light assembly (10) contains at least two light (11, 12) sources or two groups of the light sources, at that each of the above light sources (11, 12) or each of the above groups has individual light distribution performance, at that aggregated light distribution for the light assembly (10) is adjusted by change in light output ratio for at least two above light sources (11, 12) or groups of light sources.

EFFECT: simplifying adjustment of light distribution.

10 cl, 9 dwg

FIELD: mechanics, physics.

SUBSTANCE: device to excite electroluminescence consists of input unit connected in series with microprocessor unit, sinusoidal oscillation generator, amplitude-frequency response corrector, step-up transformer and exciting electrodes furnished with plates for the specimen to be placed there between. Note that the said exciting electrodes are optically coupled with the photo receiver connected with the ADC which, in its turn, is connected with the microprocessor unit. The latter is connected to the display unit and amplitude-frequency response corrector, while the sinusoidal oscillation generator is connected via a feedback loop with the microprocessor unit.

EFFECT: simpler design, smaller sizes, brightness correction in wide frequency range.

3 dwg

FIELD: physics.

SUBSTANCE: fluorescent tube fitting device has a light-emitting diode element (4) which includes at least one electric starter element (4.1) connected to at least one phase conductor and also connected to at least one neutral wire at least through one conductor (4.2) having at least one light-emitting diode (4.3).

EFFECT: reduced need to replace fluorescent tubes in fittings and reduced electrical power consumption.

3 cl, 2 dwg

FIELD: physics.

SUBSTANCE: invention relates to a light-emitting device (1) having an exciter (10) and a flat light-emitting element (20), where the exciter (10) is connected to a source (2) and a the light-emitting element (20), and where the light-emitting element (20), which has internal capacitance (21), is connected to the said exciter (10) so that the internal capacitance (21) serves as the passive output filter of the exciter (10).

EFFECT: design of a light-emitting device with smaller thickness.

10 cl, 9 dwg

FIELD: physics.

SUBSTANCE: proposed illuminator 10 built around LEds comprises assemblage of LED different-colour light sources 14 to produced mixed-colour light and LED source control device to control said sources in compliance with preset values. Note here that first control data are generated by, at least, one colour transducer 22. Illuminator differs from known designs in that its incorporates device 30, 32 designed to determine the temperature of each LED light source and device 26 to compensate for preset values in compliance with second control data including LED light source temperature.

EFFECT: higher stability of operation.

20 cl, 2 dwg, 1 tbl

FIELD: physics.

SUBSTANCE: invention relates to a device for powering luminous elements, having an energy supply unit (12), a first luminous element (30), having a first colour, preferably white, a second and a third luminous element (34, 38), having a second and a third colour, preferably for adjusting the colour of the first luminous element, and a controlled switch (42), connected in series to the said third luminous element (38). Said serial connection from the said third luminous element (38) and said switch is connected in parallel to the said second luminous element (34). The energy supply device is characterised by that the said energy supply unit (12) has a third and a second output (20, 22). The said first luminous element (30) is connected to the said first lead (20) and the said second and third luminous elements (34, 38) are connected to the said second led (22), the said energy supply unit (12) is configured to provide controlled, preferably independently controlled, output signals on the said first and second leads (20, 22), and the said second and third luminous elements (34, 38) and the said energy supply unit (12) are configured in such a way that, the said third luminous element (38) emits light when the switch (42) is closed. The invention also relates to a method of powering the luminous elements.

EFFECT: fewer switches.

20 cl, 4 dwg

FIELD: physics.

SUBSTANCE: circuit (1) with light-emitting diodes is provided with first subcircuits, having first light-emitting diodes (11) and second subcircuits having second light-emitting diodes (13) and switches (14), in conducting states, for switching on the second light-emitting diodes (13) and switching off the first light-emitting diodes (11), and, in non-conducting states, for switching off the second light-emitting diodes (13) and switching on the first light-emitting diodes (11). Also, the first and second subcircuits have different signal characteristics, such as different minimum threshold voltage values, so as to be realised by different types of light-emitting diodes (11, 13) or using a different total number of serial light-emitting diodes (11, 13) or by adding elements with threshold voltage to the first subcircuits. The light-emitting diodes (11, 13) have different colours and can be used backlight.

EFFECT: simplification.

16 cl, 4 dwg

FIELD: physics.

SUBSTANCE: illumination device (1) comprises, for example, diodes LED (L1, L2, L3, L4) with separate emission spectra. Detectors D1, D2, D3, D4) can generate a vector of measurement signals (S1, S2, S3, S4) which represent light output of one active light emitter. Further, based on a linear relationship obtained during the calibration procedure, the characteristic value of the light output of that light emitter (L1, L2, L3, L4) is calculated using the measurement vector, wherein said characteristic value is based on the decomposition coefficient of an individual emission spectrum on basic functions.

EFFECT: improved method.

25 cl, 6 dwg

FIELD: physics.

SUBSTANCE: illumination system (100) comprises: a set (14) of lamps; a controller (115); a user input device (19); memory (120) which determines discrete colour points containing an ID table (121) of hue, an ID tale (122) of saturation, an ID table (123) of brightness and boundary memory (124) which determines the boundary of the colour space. Based on data (x1, x2, x3) received from the user input device and information in the memory, the controller generates colour control signals (ξ1, ξ2, ξ3) for the set of lamps. The controller compares user input data with information in the boundary memory. If the controller detects that the said point lies beyond the boundaries of the colour space, the controller calculates the replacement point on the boundary of the colour space which was determined in the boundary memory (124), and generates is control signals based on the replacement point.

EFFECT: reduced volume of memory space required.

3 cl, 3 dwg

FIELD: physics.

SUBSTANCE: switched array of light elements has first, second and third light-emitting elements and first and second switches. The first light-emitting element has first and second leads, and the second light-emitting element has a first lead and a second lead connected to the second lead of the first light-emitting element. The third light-emitting element has a first lead connected to the first lead of the first light-emitting element, and a second lead. The first switch has a first lead connected to the first leads of the first and third light-emitting elements, and a second lad connected to the first lead of the second light-emitting element. The second switch has a first lead connected to the second lead of the third light-emitting element, and a second lead connected to the second leads of the first and second light-emitting elements.

EFFECT: fewer circuit components.

13 cl, 8 dwg

FIELD: electricity.

SUBSTANCE: matrix of luminous elements (100) includes the first (LEE1), the second (LEE2) and the third (LEE3) light-emitting elements and the first (140) and the second (150) controlled current sources. The first light-emitting element differs with the first operating voltage VOpi at which or over which it can essentially emit the light. The second light-emitting element includes the first output (120a) and the second output (120b) connected to the second output of the first light-emitting element; at that, the second light-emitting element differs with the second operating voltage Vop2. The third light-emitting element includes the first output (130a) connected to the first output (110a) of the first light-emitting element and the second output (130b); at that, the third light-emitting element differs with the third operating voltage Vop3. The first controlled current source is connected between the first output of the first light-emitting element and the first output (120b) of the second light-emitting element, and the second controlled current source is connected between the second output (110b) of the first light-emitting element and the second output of the third light-emitting element.

EFFECT: reducing the number of circuit components.

15 cl, 5 dwg

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