Led lighting device with characteristic of colour temperature of incandescent lamp

FIELD: electricity.

SUBSTANCE: lighting device includes sets of LEDs using natural characteristics of LEDs to bear a resemblance to an incandescent lamp performance at reduction of brightness. Technical result is simpler control. The first set of at least one LED provides light of the first colour temperature, and the second set of at least one LED provides light of the second colour temperature. The first and the second sets are connected in series, or the first and the second sets are connected in parallel, with a resistive element as far as possible with the first or the second sets. The first and the second sets differ by temperature characteristic or have different resonance electric resistance.

EFFECT: lighting device generates light with a colour point parallel and close to a black body curve.

15 cl, 17 dwg

 

The technical FIELD TO WHICH the INVENTION RELATES.

The present invention generally relates to lighting devices containing many Seeds as light sources and having only two output terminals to receive power, and more specifically to an LED lighting device having the characteristic color temperature of incandescent lamps when dimmed. The invention additionally relates to a kit of parts containing the LED lighting device and the device is dimmable.

The prior art INVENTIONS

The traditional light bulb is an example of a lighting device containing a light source, that is, the filament having two output terminals to receive power. When a voltage is applied to such a light bulb, through the filament current is flowing. The filament temperature rises due to ohmic (dzhoulevo) heating. The filament generates light having a color temperature relating to the temperature of the filament, which can be considered as a blackbody. Typically, the lamp has a nominal mode corresponding to the rated power of the lamp at the rated lamp voltage, e.g. 230 V AC in Europe, and the corresponding identity of the nominal color of the light emitted.

For many decades people have become accustomed to the light of incandescent lamps is asnyk capacity. The light bulb provides a General sense of well-being. Generally, the lower the power of the incandescent lamp, the lower the color temperature of the light emitted by this lamp. As the study of human perception of light "warmer"when the color temperature is lower. With the same incandescent lamp, the lower the power supplied to the lamp, that is, when the lamp is dimmed, the lower the color temperature of emitted light.

We already know that you can dim the lamp, that is to reduce the light output. This is done by reducing the average power of the lamp by reducing the average voltage of the lamp, for example using a phase cut-off. The result also decreases the temperature of the filament, and therefore, the color of emitted light is changed to a lower color temperature. For example, in a standard incandescent lamp having a nominal mode 60 W, color temperature is about 2700 K, when the lamp is operated at 100% light output, while the color temperature is reduced to about 1700 K, when the lamp dims to 4% of the light output. As it is well known to the person skilled in the technical field, color temperature follows the line of the traditional black-body on the color chart. A lower color temperature corresponds to a more reddish feeling, and what it is associated with a more warm, more cozy and pleasant atmosphere.

A relatively recent trend is the replacement of light sources incandescent lighting devices based on LED light sources due to the fact that LEDs are more efficient in converting electric energy into light and have a long life. Such a lighting device includes, in addition to the actual LED source (s) of light, a driver that receives a voltage that is designed to actuate the incandescent lamp, and converts the input voltage working current Sid. LEDs are designed to provide nominal light output when driven by a constant current having a nominal value. LEDs can also be dimmed. This can be done by reducing the current value, but this usually results in a color change of the light output. To maintain the color temperature of the generated light as possible constant, dim Sid is usually performed using a pulse-width modulation, also designated as the darkening of the business cycle, where the current Sid is switched on and off with a relatively high frequency, where the magnitude of the current in the periods of the circuit is equal to the nominal calculated value and where the relationship between the switching time and the switching period determines the light output.

VC is positive to have the lighting device, having one or more LEDs as a light source, which simulates the dimming mode of the traditional incandescent lamp, so that when the dimming color temperature of the extracted light also follows the trajectory (preferably close to the line of absolutely black body) from the higher color temperature to lower temperature.

Already proposed lighting devices that support such functionality, for example in WO 2008/084771 or US 2006/0273331. Such devices of the prior art contain at least two Sid mutually different colors, and each supplied with a corresponding current source, and an intelligent control device, for example a microprocessor controlling a separate current sources to change the relative light outputs of the respective Seeds.

WO 2008/084771 discloses a light-emitting device that can emit light of an arbitrary color temperature, and a method for actuating the light-emitting device. The light emitting device includes the one and the other LED devices connected in parallel to have a reverse polarity, and a source of DC power, allowing the inversion of the polarity. Color temperature of one LED device is set higher than the other LED devices.

The device, known is th of US 2006/0273331, receives the signal of the input voltage, which transfers power and control signal. In the device control signal is extracted from the input signal and is transmitted in intelligent control device, which controls the individual current sources based on the received control data. By changing the relationship between the respective light outputs relative contributions to the total light output is changed, and therefore changes the overall color of the overall light output, which is perceived by the observer. Therefore, such a lighting device requires a separate control input.

In LED lighting devices can obtain a characteristic color temperature LED light, which in terms of dimming is similar to that of the incandescent lamp, but still only at the expense of large control current, for example, known from DE10230105. The need to add controls in LED lighting for the desired characteristics of the color temperature increases the number of components increases the complexity of the lighting device and increases the cost. These undesirable results.

The INVENTION

The present invention aims to provide a scheme SIDA for such LED lighting and LED lighting device containing such a circuit C is a, in which intelligent control can be excluded and in which you can eliminate the feedback.

It would be desirable to provide an LED lighting device having the characteristic color temperature when dimmed, similar or tending to the characteristic color temperature of incandescent lamps when dimmed. It would also be desirable to provide an LED lighting device having the characteristic color temperature of incandescent lamps when dimmed, without the need for advanced control.

To better address one or more of these problems, one feature of the invention provides an LED lighting device that contains the driver Sid, allowing the formation of reduced current SIDA, and the LED module with two terminals having two input terminals for receiving the input current from the driver Sid. The LED module includes a first group of LEDs containing at least one LED of the first type for generating light having a first color temperature, and a second group of LEDs containing at least one LED of the second type to generate light having a second color temperature different from the first color temperature. LED module allows the supply currents of the LEDs in groups of LEDs, and these currents Seeds are obtained from the input current. LED module creates a St. the postal outlet, having at least the contributions of the light output from the first group of LEDs and the second group of LEDs. LED module is designed to change the individual currents of the LEDs in separate groups of LEDs depending on the average value of the obtained input current so that the color point of the light output of the module varies depending on the magnitude of the input current. LED module contains an electronic circuit division, allowing the control currents of the LEDs in the above-mentioned first and second groups of LEDs depending on the level of the input current received at the input of the LED module.

In accordance with a feature of the present invention, the LED lighting device includes a single current source with adjustable brightness and LED module, receiving current from the current source. LED module operates as a load for the current source, similar to an array consisting only of Seeds. In the LED module of the electronic circuit measures the amount of current from the input current and distributes current different LED sections in the LED module based on the measured current. In the current source does not need any intellectual of the current control.

In one feature of the invention provides an LED lighting device that contains many Seeds and two outputs for supplying power to the lighting device. The lighting device includes a first set of at least one Sid of the first t is PA, generating light having a first color temperature, and a second set of at least one Sid of the second type, generating light having a second color temperature different from the first color temperature. The first set and second set are connected in series or in parallel between terminals. The lighting device is configured to generate light with a color point, varying in accordance with the curve of a black body when changing the average current fed to the conclusions.

Description color temperature of the incandescent lamp can be described by the following ratio:

CT(x%)=CT(100%)*(x/100)19.5

where CT(100%) - color temperature light at full lamp power (100% DC), CT(x%) - color temperature of light in the darkening x% lamps (x% DC, where 0<x<100).

In the embodiment, the first set is changing the first light output depending on the junction temperature Sid of the first type and the second set has changing the second light output depending on the temperature of the transition SIDA WTO the CSO type, where and when changing the temperature of the transition changes the ratio of the first luminous flux to the second light output. In particular, when the first color temperature is lower than the second color temperature, the lighting device is configured so that, when reducing the temperature of transition of the first output light flux of the second light output is increased, and Vice versa. In this configuration, for example, by connecting a first set of sequentially for the second set, the first light output increases relative to the second output stream when the lighting device is darkened by generating light having a lower color temperature.

In the embodiment, the first set has a first resonant electrical resistance, and the second set has a second resonant electrical resistance. When, for example, the first set is connected parallel to the second set, get different outputs of the light fluxes from the first set and second set, which can be designed to generate light having a lower color temperature when dimmed.

In other features of the present invention is provided a kit of parts lighting that contains the illumination controller having input terminals adapted for connection is ing to a power source, and having output terminals adapted to provide a variable electrical energy. Variant of implementation of the lighting device in accordance with the present invention has conclusions that are configured to connect to the output terminals of the illumination controller.

Further useful developments are mentioned in the dependent claims.

BRIEF DESCRIPTION of DRAWINGS

These and other features, characteristics and advantages of the present invention will be further explained by the following description of one or more preferred embodiments with reference to the drawings, in which identical reference numbers indicate identical or similar parts and in which:

Figa-1D is a block diagram, schematically illustrating the present invention;

Figa and 2B are charts illustrating the characteristics of the distribution of current in the scheme of the division in accordance with the present invention;

Figa diagram illustrating a first variant implementation of the scheme of the division in accordance with the present invention;

Figv diagram illustrating a variation of the first option exercise schemes division in accordance with the present invention;

Figa diagram illustrating a second variant of implementation of the scheme of the division with regard to the availa able scientific C with the present invention;

Figv diagram illustrating a third possible implementation schemes division in accordance with the present invention;

5 is a diagram illustrating a fourth possible implementation schemes division in accordance with the present invention;

6 - depicts the LED lighting device in the fifth embodiment of the present invention, fed by current source;

7 - illustrates the ratio between the luminous flux and temperature for different types of Seeds;

Fig - illustrates additional ratio between the luminous flux and temperature for different types of Seeds;

Fig.9 - illustrates the relationship between the ratio of the luminous flux and coefficient dimming for different types of Seeds;

Figure 10 represents the LED lighting device in the sixth embodiment of the present invention, fed by current source;

11 - illustrates the relationship between the current Sid and direct voltage for different types of LEDs, as well as the ratio of the current through the first and second sets of LEDs from figure 10.

DETAILED description of the INVENTION

Figa schematically shows the device 10 of the lighting, with the cord 11 power supply and the plug 12 connected to a wall outlet 8, which receives the reduced voltage from the lighting controller 9 connected to the mains M, for example, 230 the AC at 50 Hz in Europe. Note that instead of the wall outlet 8 and the fork 12 of the device 10 lighting can also connect directly via hard wiring. Traditionally, the device 10 lighting contains one or more incandescent lamps.

Figv in the left-hand side shows the traditional layout device 10 lighting with LEDs as a light source. This device contains the driver 101, which generates the current for the array 102 of LEDs. Driver 101 has an input terminal 103 for receiving power from the network. In traditional systems, the driver can only be turned on or off. In a more complex system driver 101 is adapted to receive the reduced voltage from the controller 9 lighting and formation of the pulsed output current for the LEDs, and the amplitude of the pulse is equal to the rated current, while the average current is reduced based on the information about shading contained in the reduced voltage. In the right side figv shows the device 100 lighting in accordance with the present invention, in which the array 102 of LEDs is replaced by the LED module 110; as can be seen from the driver 101, the LED module 110 operates as an array of LEDs, that is, the load characteristics of the LED module of the same or similar load characteristics of the array of LEDs.

Figs - block diagram, schematically illustrating the basis is the Central idea of the LED module 110 in accordance with the present invention. The module 110 has two input terminals 111, 112 for receiving the current Sid from the driver 101. The module 110 includes at least two arrays 113, 114 Seeds. Each array of LEDs may consist of a single seed or may contain two or more Seeds. In the case of an array of LEDs, containing many Seeds, such LEDs can be connected in series, but it is also possible to connect the LEDs in parallel. In addition, in the case of an array of LEDs, containing many Seeds, such LEDs can all be of the same type and/or the same color, but it is also possible that the set includes LEDs mutually different colors. It is seen that in the schematic representation of figs shows only two arrays of LEDs, however, note that the LED module can contain more than two arrays of LEDs. Additionally, we note that such arrays can be connected in series and/or parallel. The module 110 further comprises a circuit 115 division that provides the excitation current arrays 113, 114 Seeds, and these excitation currents are obtained from the input current Sid, which is taken from the driver 101. Scheme 115 division is supplied by the sensor 116 current measuring input current Sid and providing the scheme 115 division information representing the instantaneous average input current. The sensor 116 may be a separate sensor that is external to the circuit 115 division, as the show is about, however, it can also be an integral part of the scheme 115 division. The value of the separate excitation currents for the respective arrays 113, 114 Seeds depend on the instantaneous average of the input current, and more specifically the relationship between the individual excitation currents in the respective arrays 113, 114 of the Led depends on the instantaneous average of the input current. To this end, the circuit 115 division can be supplied storage device 117, or external to the circuit 115 division, as shown, or as an integral part of the circuit 115 division containing information that specifies the ratio between the full input current and the ratio of the current distribution. Information may be in the form of, for example, functions or reference table, where the scheme 115 division includes intelligent management tool, such as a microprocessor. However, in a cost-effective embodiment, preferred in the present invention, the circuit 115 division consists of electronic circuits with passive and/or active electronic components fed by the voltage drop across the LEDs, and the function of the storage device is implemented in the performance of electronic circuits.

Figa and 2B are charts illustrating an example of characteristics of the current distribution among the possible alternative implementation schemes 115 division using the formula I1=p∙Iin and I2=q∙Iin, and I1 denotes the current in is ervah LEDs (white), and I2 denotes the current in the second LEDs (yellow). Neglecting the current consumption in the scheme of division, p+q=1 constantly. The horizontal axis represents the input current Iin received from the driver 101. The vertical axis represents the output current provided by the arrays 113, 114 Seeds. Assume that the LEDs in a single string, for example the first line 113 are white LEDs and that Led to another line are yellow LEDs. Curve W represents the current white LEDs, and curve A represents the current in the yellow LEDs. Figa illustrates the linear response, whereas figa illustrates an example non-linear characteristics; it should be clear that also other possible ways of implementation. In all cases the sum of the currents in the two lines is almost equal to the input current Iin, is represented by a straight line, although the scheme of division can also consume a small amount of current, but it neglected to discuss. The figure shows that when the input current Iin maximum, all the current goes to the white Led and the yellow Led is off. When the input current Iin is reduced, the percentage of current white LEDs is reduced, and the current through the yellow LEDs increases. After some level input current all current goes to yellow LEDs and the white LEDs are off. Because the color point of the extracted light is determined by the General contribution of all of the LEDs in each row, it should be clear that the color is white, when the input current Iin maximum, and that the color point becomes warmer with decreasing input current.

In a more General sense, when Iin is zero or close to zero, p is equal to the minimum value Pmin, which may be zero, and q is equal to the maximum value Qmax, which may be equal to one. When Iin is at a predetermined nominal (or maximum) level q equal to the minimum value Qmin, which may be zero, and p is equal to the maximum value Pmax, which can be equal to one. There is at least a range of input currents, where dp/d(Iin) is always positive, and dq/d(Iin) is always negative. There may be a range of input currents, where p and q are constant. There may be a range of input currents, where p=0. There may be a range of input currents, where q=0.

In accordance with the present invention an important issue is that the scheme of division allows individual change of current in at least one array of LEDs. There are several possible ways to accomplish this. For example, it may be that the two arrays 113, 114 are parallel and that the input current is divided into the first part going into the first array 113, and the second part coming in the second array 114, as illustrated in fig.1D. The sum of the first and second part can always be equal to the input current. Split the current may be based on the values to each array got DC, but still variable; this can be achieved, for example, if the scheme of division contains at least one controlled impedance or at least one controlled current source sequentially to the array of LEDs. The division of the current can also be performed on a temporary basis, so that each array received current pulses with a constant, but variable pulse width; this can be achieved, for example, if the scheme of division contains at least one controlled switch in series with the array of LEDs. It may be that the third load (for example, a resistor is used to dissipate the third part of the input current to bypass the array of LEDs. It may be that one part of the current is maintained constant.

The following provides illustrative examples of typical implementations embodying the present invention, however, note that these examples are not considered as limiting the invention. Note that in the future will be shown only the LED module; driver 101 will be omitted for simplicity, since the driver 101 can be implemented by a standard driver Sid.

Figa diagram illustrating a first variant implementation of the scheme 115 division. This option is the implementation of the module LED will be but who am 300 links and its breakdown chart will indicate the number of 315 links. Circuit 315 division provides operational amplifier 310 and the transistor 320 having a base connected to the output of the operational amplifier 310, if possible, through not shown resistor. Operational amplifier 310 has a non-inverting input 301, established at the level of the reference voltage determined by the divider 330 voltage consisting of a serial arrangement of two resistors 331, 332, connected between the input terminals 111, 112, in fact the non-inverting input 301 is connected to the node between these two resistors 331, 332. LED module 300 further comprises a row of three white LEDs 341, 342, 343, placed in series between the input terminals 111, 112, and the resistor acts as a sensor 350 current, placed in series with a string of white LEDs. The resistor 360 feedback has one output connected to the node between the resistor/sensor 350 current and a string of white LEDs 341, 342, 343, and has a second output connected to the inverting input of operational amplifier 310. Transistor 320 has an output emitter connected to the inverting input of operational amplifier 310. The output collector of transistor 320 is connected to the line 341, 342, 343 Seeds, in this case, the node between the first led 341 and the second led 342, with a yellow led 371 in this line of the header.

Thus, in the shown variant of the implementation of the tract collector-emitter of transistor 320 is connected in parallel to the portion of the string of white LEDs 341, 342, 343; this may be viewed as forming only three rows, with one row contains two white SIDA 342, 343 parallel to the line containing one yellow LED 371, and these two lines are connected in series to the third line containing a single white LED 341. Alternatively tract collector-emitter of transistor 320 could be connected in parallel to the entire string of white LEDs 341, 342, 343, and in this case it would be only two lines. In the example there are three white Sid 341, 342, 343 consistently, but they could be two, or four, or more. In this example, the line of the header contains only one yellow LED, but this line could contain a serial arrangement of two or more yellow Seeds. In General, it is preferable that the number of yellow LEDs, connected in series in the collector line, was less than the number of series connected white LEDs in a line parallel to the path of the collector-emitter of transistor 320.

The operation is as follows. With increasing input current, the voltage drop across the resistor/sensor 350 current increases, respectively, increasing the voltage between the input terminals 111, 112, respectively, increasing the voltage on reinvestiruet the input of the operational amplifier. Since the voltage drop across the string of white LEDs 341, 342, 343 almost constantly, the rise of the voltage is tion between the input terminals 111, 112 almost equal to the increase in the voltage drop across the resistor/sensor 350 current, while the voltage increase on reinvestiruet the input of the operational amplifier is less than the rise in the voltage between the input terminals 111, 112, and the ratio is set by the resistors 331, 332 in the divider 320 voltage. Thus, the voltage drop across the resistor 360 feedback should be reduced and therefore decreases the current in the path of the collector-emitter of transistor 320.

Figv diagram illustrating a second variant of implementation of the scheme 115 division. This option is the implementation of the LED module will be indicated by reference number 400, and his scheme of division will be indicated by the number of 415 links. Circuit 415 division is almost identical to the scheme 315 division except that the operational amplifier 310 has a non-inverting input 301, exhibited at the level of the reference voltage Vref determined by the source 430 reference voltage, providing a reference voltage, such as 200 mV, while additionally the base of transistor 320 is connected with a positive input terminal 111 through a resistor 440. One important advantage of this scheme 415 division before circuit 315 division of figa is that it is more stable, i.e. less sensitive to changes in the direct voltages of the individual Seeds. Work comparable: with increasing input current PA is giving voltage across the resistor/sensor 350 current increases, accordingly, increasing the voltage on the inverting input 302 of the operational amplifier, reducing the base voltage of the transistor and therefore reducing the current in the path of the collector-emitter of transistor 320.

Figa - block diagram, comparable with fig.1D illustrating a second variant implementation of the LED module 500, where the input current Iin is divided between the two lines 113, 114 Seeds on a temporary basis. The scheme of division in this embodiment, will be indicated by the number 515 links. The module 500 contains the managed switch 501, having an input terminal receiving the input current Iin, and having two output terminals connected to lines 113, 114 Seeds, respectively. Managed switch 501 has two modes of operation: mode, where the first output terminal is connected to its input terminal, and a mode where the second output terminal is connected to its input terminal. Circuit 520 controls the managed switch 501 to switch between these two modes of operation with a relatively high frequency. Thus, each row 113, 114 of the Led receives a current pulse having a certain duration t1, t2, respectively, and the current pulses have an amplitude Iin. If the switching period is specified as T, the ratio t1/T is the average current in the first line 113 Seeds, and the ratio t2/T determines the average current in the second line 114 Sido is, and t1+t2=T. the Circuit 520, the controller sets the duty cycle (or the ratio t1/t2) on the basis of the input current Iin, which is measured by the sensor 116 current: if the level of the input current Iin decreases, t1 decreases, and t2 is increased, so that the average light output at the first line 113 Seeds (e.g., white) decreased, and the average light output at the second row 114 of the LEDs (for example, yellow) is increased.

FIGU is a block diagram illustrating a third variant of the implementation of the LED module 600, where the amount of current in the second group 114 Seeds (for example, yellow) is controlled buck Converter 601 current, are connected in parallel to the first group 113 Seeds (e.g., white). The scheme of division in this embodiment, will be indicated by the number of 615 links. The first line 113 of the LEDs connected in parallel to the input terminals 111, 112. The filter capacitor Cb is connected in parallel to the first line 113 Seeds. The second line 114 of LEDs connected in series to the inductor L and the diode D are connected in parallel to this sequential location. Managed switch S connected in series to this parallel arrangement, controlled by the circuit 115 controls, where circuit 620 controller sets the duty cycle δ of the switch S on the basis of the input current Iin, which is measured by the sensor 116 current. The resulting current in the second line 114 Seeds okazyvaetsya Ia, and the resulting current in the first line 113 of the LEDs is indicated as Iw.

Buck Converter is operated in CCM (continuous conduction), so that the ripple in Ia small compared to its mean value. The input current Is' booster Converter is switched by a current having a maximum value of Ia, and the duty cycle δ. Switching current Is' comes from the filter capacitor Cb, and the input current Is in the filter capacitor Cb is actually the average Is'. For a buck Converter operating in CCM and neglecting ripple current, we can deduce Is=δIa. It should be clear that the current in the first line 113 Seeds is reduced by the input current Is in the filter capacitor Cb, or

Iw=Iin-Is=Iin-δIa.

Therefore, if δ is changed to adapt to the current yellow Sid Ia, the current Iw through the white Led also changes. The current source Iin has the same linear dependence on the settings of the dimmer as shown in figa/C. Input current Iin is controlled by the sensor 116 current that generates the signal read Vctrl, and circuit 620 control varies the duty cycle δ of the booster Converter and essentially modifies both current Iw and Ia.

In principle, the same separation DC white/yellow LEDs, as shown in figa/, can be implemented using this option, the implementation Advantage in comparison with other variants of implementation is more efficient. Booster Converter by its nature is more efficient than a linear current regulator, which are in fact other ways to implement figa-3V. Through suitable network current measurement (offset "current mirror") the sensing resistor Rs can leave very small.

Note that the booster Converter to regulate current yellow Sid Ia, preferably is a buck Converter operated in hysteresis mode.

5 is a block diagram illustrating a fourth variant of the implementation of the LED module 700, where each separate line 113, 114 Seeds is excited by the corresponding Converter 730, 740 current, respectively. The scheme of division in this embodiment, will be indicated by the number of 715 links. In this case, two of the inverter 730, 740 current are connected in series. In the shown embodiments, the implementation of the converters shown related to the type of booster, but note that there might also be other types, such as boost Converter, the intermediate booster Converter, inverter with asymmetrically loaded primary inductance Converter Chuck, ZETA Converter. Circuit 720 control has two control output terminals for individual upravleniyaschitayut S converters on the basis of the input current Iin, which is measured by the sensor 116 current. Each Converter 730, 740 current generates an output current depending on the operating cycle of the switching of the corresponding switch S, which must be understood by the person skilled in the art. In this embodiment, for the circuit 720 control you can implement the same current dependence, as shown in figa-2B, but it is also possible to manage the individual currents for the individual lines 113, 114 Seeds independently of each other; therefore actually possible to excite both lines 113, 114 Seeds simultaneously with maximum light output or minimum light output.

You can also get the desired behavior based on their own characteristics of Seeds.

6 depicts a lighting device 1, containing at least one LED 11 of the first type, e.g. LED type AlInGaP (aluminum-gallium-indium-phosphide), and generating light having a first color temperature. At least one LED 11 connected in series with at least one CID 12 of the second type, different from the first type, such as the CID type InGaN (indium-gallium-nitride), and generating light having a second color temperature higher than the color temperature of Sid type AlInGaP. The lighting device 1 has two outputs 14, 16 for supplying current from a source 18 of the current IS in series connection Sido is 11, 12. The lighting device 1 has no active components. As indicated by the dashed line, the serial connection of the LEDs in the lighting device 1 may contain additional LEDs 11 of the first type and/or LEDs 12 of the second type, so that the lighting device 1 contains many of the LEDs 11 of the first type and/or a lot of LEDs 12 of the second type. The lighting device 1 may further comprise one or more LEDs of any other type, for example of the third type, different from the first type and second type.

One or more of the LEDs 11 of the first type are selected to have a first light output depending on the temperature, with a gradient that is different from the gradient of the second light output depending on the temperature of one or more of the LEDs 12 of the second type. In practice, the change in light output FO can be characterized by a so-called warm/cold factor indicates the percentage of loss of luminous flux from a junction temperature of 25°C to 100°C at SIDA. This is illustrated by reference to Fig.7, 8 and 9.

7 illustrates graphs of the light output FO (vertical axis lumens/mW) depending on the temperature T (horizontal axis, °C) at different LEDs 11 of the first type. The first graph 21 illustrates the decrease in light output FO with increasing temperature for red fot the metric Sid. The second graph 22 illustrates a more steep decrease in light output FO the graph 21, when the temperature increase to red-orange photometric Sid. The third graph 23 illustrates a more steep decrease in light output FO than graphs 21 and 22, when the temperature increase for yellow photometric Sid.

Fig illustrates graphs of the light output FO (vertical axis lumens/mW) depending on the temperature T (horizontal axis, °C) at different LEDs 12 of the second type. The first chart 31 illustrates the decrease in light output FO temperature increase for blue photometric Sid. The second graph 32 illustrates a slightly steeper decrease in light output FO the graph 31, with increasing temperature for green photometric Sid. The third graph 33 shows an even steeper decrease in light output FO than graphs 31 and 32, when the temperature increases to a bright blue radiometric Sid. The fourth graph 34 shows an even steeper decrease in light output FO than schedules 31, 32 or 33, as the temperature increases for white photometric Sid. Fifth schedule 35 illustrates another slightly steeper decrease in light output FO than schedules 31, 32, 33 or 34, as the temperature increases for blue photometrics the CSOs Sid.

Fig.7 and 8 show that the LED 11 of the first type has a higher warm/cool factor than the LED 12 of the second type, indicating that the gradient of the light output depending on the temperature at SIDA 11 above gradient light output depending on the temperature at SIDA 12.

Fig.9 illustrates a graph 41 ratio of light output FR (vertical axis, dimensionless) in row 11 of the LEDs of the first type (red, orange, yellow), with a relatively low color temperature, and line 12 of the LEDs of the second type (blue, blue, white), with a relatively high color temperature, depending on the ratio of the dimming DR (horizontal axis, dimensionless), where the temperature of the crystal Seeds equal to 100°C at 100% power (without dimming, that is the ratio of the dimming=1), and the ambient temperature is 25°C. Schedule 41 illustrates the decrease in the light output with increasing ratio of the dimming. Thus, in accordance with figure 9, the lighting device 1 having the ratio of the luminous flux of the first and second sets of LEDs, as shown, will demonstrate a decrease in color temperature when the lighting device 1 is darkened. The specific ratio of light output at a specific ratio dimming can be developed without unnecessary is experimentive by selecting the appropriate types of Seeds in suitable quantities and selection of the appropriate thermal resistance to the environment each Sid in the set of Seeders to obtain the desired temperature for the LEDs in a particular darkening coefficients. For example, there may be one or more of the LEDs of the first type, for example of AlInGaP LEDs, with a higher thermal resistance to the environment than one or more of the LEDs of the second type, for example of InGaN LEDs. In a suitable implementation, the LED lighting device 1 will show the characteristic color temperature similar to the characteristic of the color temperature of incandescent lamps without additional control.

Figure 10 depicts a lighting system 50 containing at least one LED 51 of the first type, e.g. LED type AlInGaP, connected in parallel to the at least one led 52 of the second type, different from the first type, for example a led-type InGaN. The lighting system 50 has two outputs 54, 56 for applying current ISfrom a source 58 of the current in the parallel connection of the LEDs 51, 52. The resistor 59 is provided sequentially at least one led 52. Resistor 59 can also be connected sequentially to at least one CID 51 instead of a serial connection of at least one CID 52. Alternatively, the resistor may be connected sequentially to at least one CID 51, and the other resistor can be connected sequentially to at least one CID 52. The device 50 is svedeniya has no active components. As indicated by the dashed lines, at least one LED 51 and at least one LED 52 in the device 50 lighting can contain additional LEDs 51 and/or 52, so that the device 50 lighting contains many Seeds 51 of the first type and/or a lot of LEDs 52 of the second type. The lighting system 50 may optionally contain one or more Seeds of any other type, for example of the third type, different from the first type and second type.

The resistor 59 is a resistor with a negative temperature coefficient, NTC, which will compensate for the relatively slow temperature fluctuations by changing the value of its resistance.

One or more of the LEDs 51 of the first type are selected to have a first resonant impedance (measured as the ratio of the direct voltage side (LEDs) to the current through the LED (LEDs)), which is different from the second resonant resistance of one or more of the LEDs 52 of the second type, connected in series to the resistor 59. As a result the current through one or more of the LEDs 51 of the first type and the current through one or more of the LEDs 52 is variable. This is illustrated by the reference 11.

11 illustrates graphs of the currents ILED1, ILED2 (left vertical axis, amps) depending on the forward voltage FV (horizontal axis, in volts) for SIDA (Seeds) of the first and the which type. Referring also to figure 10, the first graph 61 illustrates the current ILED1 in side (LEDs) 51 InGaN depending on the direct voltage side (LEDs) 51. The second graph 62 illustrates the current ILED2 in side (LEDs) 52 AlInGaP and resistor 59 depending on the direct voltage side (LEDs) 52 and the resistor 59. In the illustrated example, the resistor 59 is set to 8 Ohms.

11 additionally shows a graph 63 relationship of current ILED1/ILED2 (right vertical axis, dimensionless) depending on the forward voltage FV. As you can see on the graph 63, for direct voltage FV above approximately 2.9 In more current ILED1 flowing through the LED (LEDs) 51 than the current ILED2 through the LED (LEDs) 52 and resistor 59, while the lower forward voltage FV approximately 2.9 In the current ILED1 weaker ILED2. Accordingly, when the current provided by source 58 current is attenuated in the operation of the dimmer, the light output from SIDA (Seeds) 51 will decrease at a greater rate than the decrease in light output from SIDA (Seeds) 52, so that the color temperature of the device 50 lighting will be more to strive for color temperature SIDA (Seeds) 52 than at a higher current provided by source 58 DC, where the color temperature of the device 50 lighting will be more to strive for color temperature SIDA (Seeds) 51. In a suitable implementation, the LED device 50 of the lighting will be, respectively, demonstrate features : the tick color temperature similar to the characteristic of the color temperature of incandescent lamps without additional control.

The sources 18, 58 current configured to provide direct current, which may have a weak ripple current. For the purpose of dimming the sources 18, 58 current can be pulse width control. In the case of source 18 current supply device 10 of the lighting, the junction temperature of the LEDs will be reduced by shading. In the case of source 58 power during a blackout should reduce the average current during the time when the current flows in the device 50 of the lighting. Thus, each source 18, 58 current should be considered as the illumination controller having output terminals which are adapted to provide a variable electrical energy, in particular alternating current, and findings 14, 16 and 54, 56 respectively are configured to connect to the output terminals of the illumination controller.

Above explained, in the lighting device used sets of LEDs that use natural characteristics of Seeds for similarity with the characteristics of the incandescent lamp when dimmed, thereby eliminating the need for complex management. The first set of at least one SIDA gives the light of the first color temperature and a second set of at least one SIDA gives the light of the second color temperature. The first set and second set are connected in series, or the first set and the second is abortion practices are connected in parallel, if possible with a resistive element in series with the first or second set. The first set and second set are different in temperature characteristic or have different resonant electrical resistance. The lighting device produces light with a color point that is parallel and close to the black body curve.

If necessary, this document reveals the detailed embodiments of the present invention; however, it should be understood that disclosed embodiments of are merely examples of the invention, which can be implemented in various forms. Therefore, specific structural and functional details disclosed in this document should not be interpreted as limiting, but merely as a basis for the claims and as a typical basis for training of a specialist in the art of different application of the present invention in virtually any appropriately detailed structure. Moreover, used in this document, the terms and phrases are not intended to be limiting, but are intended rather to provide an understandable description of the invention.

The articles "a" or "an"are used in this document are defined as "one" or "one". The term "lot" as used in this document definition who is two or more than two. The term "other" when used in this document is defined as "at least a second or more." The terms "includes" and/or "having" when used in this document are defined as "containing" (i.e. open the wording does not exclude other elements or steps). Any signs of references in the claims should not be interpreted as limiting the scope of the claims or inventions.

The fact that some criteria are listed in mutually different dependent claims does not indicate that a combination of these criteria cannot be used with benefit.

The term "coupled" when used in this document, is defined as connected, although not necessarily directly, and not necessarily mechanically.

Summing up, in the lighting device the present invention provides that apply sets of LEDs that use natural characteristics of Seeds for similarity with the characteristics of the incandescent lamp when dimmed, thereby eliminating the need for complex management. The first set of at least one SIDA gives the light of the first color temperature and a second set of at least one SIDA gives the light of the second color temperature. The first set and second set are connected in series, or the first set and the second set is otkluchaetsia in parallel, if possible with a resistive element in series with the first or second set. The first set and second set are different in temperature characteristic or have different resonant electrical resistance. The lighting device produces light with a color point that is parallel and close to the black body curve.

The present invention also relates to a kit of parts lighting that contains:

the illumination controller having input terminals adapted for connection to a power source and having output terminals adapted to provide a variable electrical energy; and

the lighting device in accordance with any item of the attached claims, where the findings of the lighting device configured for connection to the output terminals of the illumination controller.

Although the invention is illustrated and described in detail in the drawings and foregoing description, the specialist in the art should be understood that such illustration and description should be regarded as explanatory or exemplary and not restrictive. The invention is not limited to the disclosed variants of implementation; on the contrary, there may be some variations and modifications within the scope of protection of the invention defined in the attached claims.

E.g. the measures can use other colors. For example, instead of the yellow (amber) you could use yellow or red. Additionally, we note that in the example, the contribution of white LEDs decreases to zero with decreasing input current, but this is not necessary.

Additionally, although the above driver 101 is described as enabling to obtain a reduced voltage from the controller 9 lighting, it is also possible that the driver 101 is adapted for dimmable by remote control, along with obtaining normal mains voltage. An important feature is that the driver 101 acts as a current source and allows the formation of a reduced output current, which is assumed to be the LED module as the input current. Thus, the light output is determined by the driver 101 by forming a specific output current to the LED module, and the color of the light output is determined by the LED module depending on the current received from the driver 101.

A single processor or other unit may fulfill the functions of several items listed in the claims.

Above the present invention is explained with reference to flowcharts that illustrate functional blocks of the device in accordance with the present invention. We must understand that one or more of these functional blocks may be implementing the designed hardware, where the function of such a functional block is performed by individual hardware components, but it is also possible that one or more of these functional blocks are implemented in software, so that the function of such a functional block is performed by one or more lines of computer program or a programmable device, such as a microprocessor, microcontroller, digital signal processor, etc.

1. The lighting device (100), comprising:
driver Sid (101)made with the possibility of forming a power blackout Sid;
LED module(110; 300; 400; 500; 600) with two terminals having two input terminals (111, 112) for receiving an input current (Iin) from the driver Sid (101) and contains:
the first group of LEDs (113)containing at least one LED of the first type for generating light having a first color temperature;
the second group of LEDs (114)containing at least one LED of the second type to generate light having a second color temperature different from the first color temperature;
this module allows the supply currents of the LEDs in groups of LEDs, and these currents Seeds are obtained from the input current (Iin);
this LED module creates a light output that has at least the contributions of the light output from the first group of LEDs (113) and from the second group of LEDs (114);
and when is that the module has been designed to change the individual currents of the LEDs in separate groups of LEDs depending on the average value of the obtained input current (Iin) what color point of the light output of the module varies depending on the magnitude of the input current
wherein the LED module includes an electronic circuit division (115), allowing the control currents of the LEDs (I1, I2) in the above-mentioned first and second groups of LEDs (113, 114) depending on the level of the input current received at the input of the LED module.

2. The lighting device according to claim 1, in which the LED module is designed to change the individual currents of the LEDs in separate groups of LEDs so that the color point of the light output from the module while the shading follows the curve of a perfectly black body.

3. The lighting device according to claim 1, in which the LED module is designed to change the individual currents of the LEDs in separate groups of LEDs so that the characteristic color of the light output of the module when dimming is similar to the characteristic color of incandescent bulbs.

4. The lighting device according to claim 1, the lighting device is configured to generate light with a color temperature CT at an average current of x%, CT(x%)applied to the conclusions, based on the ratio:
CT(x%)=CT(100%)*(x/100)19.5

5. The lighting device according to claim 1, in which the first group of LEDs is changing the first light output depending on the temperature of transition to the Sid of the first type and the second group of LEDs has a varying second light output depending on the temperature of transition to the Sid of the second type, and where the changing temperatures of the transition changes the ratio of the first luminous flux to the second light output;
and with the first color temperature is lower than the second color temperature, while reducing the temperature of transition of the first output light flux of the second light output is increased, and Vice versa.

6. The lighting device according to claim 1, in which the gradient of the first light output depending on the temperature of transition to the Sid of the first type differs from the gradient of the second light output depending on the temperature of transition to the Sid of the second type;
and in which the first color temperature is lower than the second color temperature, while the absolute value of the gradient of the first light output depending on the temperature at the Sid of the first type above the gradient of the second light output depending on the temperature at the Sid of the second type.

7. The lighting device according to claim 1, in which thermal resistance to the environment in which ervay group of LEDs is different from thermal resistance to the environment in the second group of LEDs;
and in which the first color temperature is lower than the second color temperature, while thermal resistance to the environment in the first group of LEDs above thermal resistance to the environment in the second group of LEDs.

8. The lighting device according to claim 1, in which the first group of LEDs has a first resonant electrical resistance, and the second group of LEDs has a second resonant electrical resistance.

9. The lighting device of claim 1, wherein one of the first group of LEDs and the second group of LEDs is connected in series to the resistor, and which is the serial arrangement is connected in parallel to another of the first group of LEDs and the second group of LEDs, and in which this parallel arrangement is connected between two input terminals (111, 112) LED module;
and where the resistor is a resistor with a negative temperature coefficient, NTC.

10. The lighting device according to any one of the preceding paragraphs, in which the LED of the first type is the led type AlInGaP and/or in which the LEDs of the second type is the led type InGaN.

11. The lighting device according to claim 1, in which an electronic circuit division allows the power of the two groups of LEDs with a constant current and the control current of the LEDs (I1, I2) so that the following applies:
I1=p∙Iin and I2=q∙Iin, and p+q=1
while Iin denotes the value of the input current is,
I1 denotes the current value in the first group of Seeds,
I2 denotes the current value in the second group of LEDs;
where there is at least a range of values of the input current, where dp/d(Iin) is always positive, and dq/d(Iin) is always negative.

12. The lighting device according to claim 11, in which the LED module contains:
element of the current control (320), placed in series with one of the mentioned groups of LEDs, and this sequential arrangement is connected in parallel with the other of the mentioned groups of LEDs;
the sensing element current (350), made with the possibility of reading the input current received at the input terminals of the LED module;
and the driver controller (310), receiving the output signal read from the sensing element and the driving element of the current control on the basis of this output signal is read.

13. The lighting device according to claim 1, in which an electronic circuit division (515) contains the managed switch (501) for the temporary separation of the received input current (Iin) between the two groups of LEDs;
the controller (520) to control the switch (501) in the switching period T, so that the input current is transmitted to the first group of LEDs during the first time duration t1 and the input current is transmitted to the second group of LEDs during the second time duration t2, and t1+t2=T;
the element SC is tawania current (116), made with the possibility of reading the input current received at the input terminals of the LED module;
the control device is connected to receive the output signal read from the sensing element and designed to change the relationship t1/t2 switch switch based on the said output signal is read, so that there is at least a range of values of the input current, where dt1(Iin) is always positive, and dt2(Iin) is always negative.

14. The lighting device according to claim 1, in which the second group of LEDs (114) is powered by a current transducer (601)having input terminals connected in parallel to the first group of LEDs (113);
in which the DC Converter includes a control circuit (620)receiving the output signal of the read element of the read current (116)that reads the input current of the LED module;
and in which the control circuit (620) designed to control the Converter current (601) on the basis of the output signal of the reading taken from the sensing element current (116).

15. The lighting device according to claim 1, in which the first group of LEDs (113) fed by the first current transducer (730), and the second group of LEDs (114) is powered by the second current transducer (740), and where these two current transformer have input terminals connected in series;
thus, the LED module includes a control circuit (720), p is inMoscow output signal read from the sensing element current (116), reading input current LED module;
and in which the control circuit (720) designed to control current converters (730, 740) on the basis of the output signal of the reading taken from the sensing element current (116).



 

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10 cl, 8 dwg

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14 cl, 12 dwg

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16 cl, 8 dwg

FIELD: mechanics, physics.

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3 dwg

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