Led-based illuminator

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

 

The invention relates to an led lighting device with multiple led light sources of different colors to obtain the mixed color light source. The present invention relates also to a method and device for controlling an led lighting device.

The combination of multi-colored LEDs to obtain a mixed color is the usual way to create a white or colored light source. Received the light source is determined by several parameters, such as type of LEDs, the proportions of the colors, the proportions of drivers, Raman ratios, etc. However, with increasing temperature of the led during operation of the optical characteristics of the LEDs change: decrease the intensity of the output radiation and shifting the peak wavelength (the wavelength corresponding to the maximum radiation).

To eliminate or reduce this problem have been proposed various devices color control to compensate for these changes in the optical characteristics of the LEDs during their use. Examples of devices or algorithms of color management is the feedback control according to the chromaticity coordinates color coordinates feedback - CCFB), management with a direct link on the temperature feed forward - TFF),the feedback control on the flow (flux feedback FFB), or a combination of two management options (FFB+TFF), which is disclosed, for example, in the publication "the stability of the color of the glow in the multichip led RGB modules with different contours color management, P. Deurenberg, and others, proceedings of SPIE, vol 5941, S (7 September 2005).

In the scheme of CCFB LEDs with filters are used to provide feedback on the chromaticity coordinates of the real light source mixed color, while the color coordinates are compared with the control or preset values characterizing the desired color of the mixed color. In this case, the driving LEDs is carried out in accordance with the obtained difference.

It is believed that such a feedback system can reliably compensate for the temperature effects all led devices. However, recent measurements show that this is not true for all combinations of the led sensor. In fact, certain combinations create a very unstable color output radiation, not much better than in the absence of compensation. The reason underlying the inefficient operation of the feedback system, is that there is a mismatch between the sensitivity of the sensor and the sensitivity of the human eye. That is, swietochowski alnost sensor and svetochuvstvitelen the human eye is different. This means that the feedback system will accurately maintain the light output in the field of the sensor, but not human eyes. If the LEDs to emit light with a constant wavelength, to compensate for the difference in sensitivity of the sensor and the sensitivity of the human eye, it would be easy. However, for different wavelengths of the mismatch between the sensitivity of the sensor and the eye's sensitivity is different, and in addition, the peak wavelength of the led increases with increasing temperature. In particular, in the wavelength ranges of the LEDs, where with increasing wavelength sensitivity of the eye increases, and the sensitivity of the sensor decreases, this discrepancy increases and leads to large differences in colors.

The aim of the present invention is to solve this problem and create an improved, more stable color led lighting device.

This and other purposes that will be clear from the following description, are achieved through the creation of an led lighting device, method and device for controlling an led lighting device in accordance with the attached claims.

In accordance with one aspect of the present invention, the set of the led lighting device that is with a lot of led light sources of different colors to obtain a mixed color light, and a device for controlling the led light sources in accordance with the difference between the given values, characterizing the mixed color light having the desired color, and the first control data characterizing the color of the mixed color light produced by the led light sources, the first control data is provided using at least one color sensor, the led lighting device is a device for obtaining the temperature of each led light source and a device to compensate for given values in accordance with second control data including temperature led light sources.

As a result of compensation of each of the given value in accordance with the temperature of the corresponding led light source can be calculated shift of the peak wavelength when the temperature of led light sources, whereby is obtained a more stable color and reliable lighting device.

It should be noted that the example of calculation of temperature changes in the led lighting device of the type CCFB known from the document "Getting the white color based on red, green and blue LEDs: problems and management, Muthu and others (2002), in which the gain of the feedback signals is adjusted depending on the temperature of heat sink (for accounting essentialpart). This approach differs from the device in accordance with the present invention, which are not regulated by the signals themselves, and the values with which compares the feedback signals. In addition, the device disclosed in the above document are installed in the field, whereas the device in accordance with the present invention installed in the area of the sensor.

Preferably, if the second control data also include controlling the temperature of the led light source for each led light source, whereby the difference between the measured temperature of the led light source and controlling the temperature of the led light source is a measure of the shift of the peak wavelength of the led light source. Since this offset is constant over a wide temperature range, it is possible to determine the peak wavelength in the moment, bringing this information is used to adjust the preset values.

Preferably, if the second control data includes data characterizing the sensitivity of the sensor (sensors) for different peak wavelengths, as well as data characterizing the spectra of led light sources on the basis of which it is possible to adjust the specified values.

the La obtain the temperature of each led light source means for obtaining data may include temperature sensor, adapted to measure the temperature of the heat sink, the host led light sources. In one embodiment, the means for obtaining data includes means for calculating the temperature of the led light sources based on at least the measured temperature of the heat sink and thermal model of multiple led light sources.

In addition, at least one color sensor can be photodiodes with filters, preferably one sensor for each color of led light source, for determining the color of light generated by led light sources.

In accordance with another aspect of the present invention created a way to control the led lighting device including multiple led light sources of different colors to obtain a mixed color light, the method includes the management of led light sources in accordance with the difference between the specified value, representing a mixed color light having the desired color, and the first control data characterizing the color of the mixed color light produced by the led light sources, the first control data is provided using at least one color sensor, this method differs receiving the receiving the temperature of each led light source and the compensation given values in accordance with the second control data, including temperature led light sources. This method has the same advantages as the previously discussed aspect of the present invention.

In accordance with another aspect of the present invention, the set of device control led lighting device including multiple led light sources of different colors to obtain a mixed color light, this device contains the device control led light sources in accordance with the difference between the specified value, representing a mixed color light having the desired color, and the first control data characterizing the color of the mixed color light produced by the led light sources, the first control data is provided using at least one color sensor, this device is means for obtaining the temperature of each led light source and means for compensating for the specified values in accordance with second control data including temperature led light sources. This control device has the same advantages as previously discussed aspects of the present invention.

These and other aspects of the present invention will be described b is more detail with reference to the accompanying drawings, illustrating preferred at the moment variant of implementation of the present invention.

Figure 1 depicts a block diagram of the led lighting device with the function of CCFB in accordance with the current level of technology,

figure 2 depicts a block diagram illustrating the led lighting device in accordance with the embodiment of the present invention.

Figure 1 depicts a block diagram of the led lighting device 10 in accordance with the prior art. The led lighting device of this type is disclosed, for example, in the above publication, "the stability of the color of the glow in the multichip led RGB modules with different contours color management, P. Deurenberg, and others, proceedings of SPIE, vol 5941, S (7 September 2005).

The led lighting device 10 includes a led lamp 12, which in turn contains one led light source 14a, including LEDs adapted to emit red light, one led light source 14b, including LEDs adapted to emit green light, and one led light source 14C, including LEDs adapted to emit blue light. Each led light source 14 is connected with the corresponding driver is 16 m for excitation of the led light source. The led lighting device 10 may, for example, to create white light by mixing the output radiation of different led light sources 14 and can be used for lighting or illumination. Led lighting device 10 may also be the led lighting device of alternating colors.

The led lighting device 10 also includes a user interface 18 and the calibration matrix 20. User input indicating the desired radiation intensity in lumens and color of the led lamp 12, is entered through the user interface 18. User input may, for example, be set in the parameters x, y, L CIE characterizing a particular position (point color) on the graph of the chromaticity CIE 1931. User input passed to the calibration matrix 20, which calculates the nominal duty cycle for each color R, G, B for the selected point color (i.e. user input is converted from the user area in the region of the actuator).

To implement the feedback chromaticity coordinates of the led lighting device 10 also contains a tri-colour sensors 22A-22p, the control unit color 24, block 26 comparison and proportional-integral-differential (PID) p is gulatory 28a-28C.

Each sensor 22A-22p is associated with a corresponding led light source 14a-14C. Thus, the sensor 22A is adapted for the perception of red, sensor 22b adapted for the perception of green, and the sensor 22s adapted for the perception of blue colors. Color sensors 22 can be, for example, photodiodes with filters.

During operation of the led lighting device 10, the sensor 22 converts the mixed color light generated by the led lamp 12, the signals of three sensors or feedback signals (first control data)corresponding to red, green, and blue color respectively. The signals of the sensors are in the area of sensors.

Then these sensor signals (characterizing the real color) are compared with predetermined values (characterizing the desired color), provided by the control unit 28 color, which in turn calculates the data set values based on input data obtained from the calibration matrix 20. That is, the control unit 28 converts the nominal operating cycles (in the area of the actuator) of the calibration matrix 20 to the specified values (area sensor) at a certain reference temperature. The specified values are compared with the corresponding values of the feedback for each color in the block comparison 26, and the floor is obtained from the result of the difference for each color R, G, B enter the PID controllers 28. PID controllers 28, in turn, change the input data, which are submitted to the drivers of LEDs 16A-16C, in accordance with the obtained difference. It provides control of red, green and blue led light sources 14a-14C so that the radiation output of the led lamp 12 had the desired colour (i.e. to reduce to zero the discrepancy between the given values and the values of feedback under steady state conditions). It should be noted that before entering into the led lamp output signals of the PID controllers is converted from the field sensors to the area of the actuator (operating cycles) and amplified using the output signals of the calibration matrix (i.e. nominal working cycles). As indicated above, the function CCFB can improve the color stability of led lighting devices, but not for each combination of the led sensor.

Figure 2 depicts a block diagram of the led lighting device in accordance with the embodiment of the present invention. The difference between the device in accordance with the prior art of figure 1 and figure 2 is that the led lighting device 10 of figure 2 further includes the function of management to direct the second communications temperature (TFF) to further improve the color stability. Function TFF here is implemented using a temperature sensor 30, the computing unit 32 and a control unit 34.

The temperature sensor 30 is mounted on the heat sink 36, and the heat sink 36 also includes led light sources 14. During operation, the temperature sensor 30 measures the temperature of the heat sink. Then the measurement result of the temperature enters the computing unit 32, based on the temperature of the heat sink, and thermal models of led light sources and the input electric current led light sources calculates the temperature (namely, the transition temperature for each led light source 14a-14C. The transition temperature is the temperature of the active layer inside the led.

Then, the data transition temperature (Tred, Tgreenand Tbluego to the control unit 34. As well as the control unit 24 of figure 1, the control unit 34 of figure 2 contains the specified values are calculated based on input data obtained from the calibration matrix 20. In addition, the control unit 34 includes a control transition temperature for each led light source 14, which results in a difference between the temperature of transition at the moment and control the transition temperature is a measure of the shift of the peak wavelength. As this offset t is aetsa constant over a wide temperature range, you can determine the peak wavelength in the moment for each led light source.

This information (the second control data is then used in block 34 to compensate for given values to calculate the displacement of the peak wavelengths when the temperature of led light sources. That is, the set values are translated to estimated peak wavelength in the moment. To perform this conversion for each color of the led light source requires a shift of the peak wavelength, the data related to the sensitivity of the sensors and spectrum led light source, an estimate of the peak wavelength at the control temperature and thermal model of the device. Thus, when the set values, characterizing the desired output radiation of the led lamp 12, is compared in block 26 comparison with the output of the led lamp currently defined values are already compensated relative shift of the peak wavelength of led light sources 14.

It should be noted that this compensation should also be applied when converting from the area sensor in the region of the actuator (i.e. between the PID-regulators and led lamp), but the reverse version. In addition, the temperature of the compute block is and 32 are also in the calibration matrix 20 to account for the displacement of the peak wavelengths.

Thus, the led lighting device in accordance with the existing at the moment of the embodiment of the present invention uses an algorithm color management, including CCFB and TFF. As indicated above, such compensation provides an led lighting device with a higher color stability. When using the algorithm, the color management CCFB+TFF in led RGB lamp (as specified above) color stability is increased by approximately two points compared with a lamp that uses only CCFB, as shown in the table below. Even more significant effect is achieved by using a control algorithm color CCFB+TFF in led AGB-lamp, where color stability is increased by 24 points compared to the option of using a control algorithm color CCFB.

Color stability for led RGB and AGB-lamps
Δu'v'
(ΔT=73 K)
Led RGB lampLed AGB-lamp
CCFB0,0080,030
CCFB+TFF0,006

Specialists in the art will understand that the present invention is not limited to the preferred versions of the implementation described above. On the contrary, there are many possible modifications and changes without departing from the scope of the attached claims. For example, the apparatus and method in accordance with the present invention can be used for various combinations of LEDs, such as RGB, AGB, ragb data member, LEDs with phosphors and other

1. Led lighting system (10), containing a number of led light sources (14) of different colors to obtain a mixed color light, and a means (28) for controlling the led light sources in accordance with the difference between the given values, representing a mixed color light having the desired color, and the first control data representing the color of the light mixed color, created with the help of these led light sources, the first control data is provided using at least one color sensor (22), characterized by means (30, 32) to obtain the temperature of each led light source light, and means (34) to compensate for the above given values in accordance with second control data including the components in themselves these temperature led light sources.

2. The system according to claim 1, in which the mentioned second control data additionally include a control temperature of led light source for each led light source, whereby the difference between the specified temperature of the led light source and a specified reference temperature of the led light source is a measure of the shift of the peak wavelength of the led light source.

3. The system according to claim 1, in which the mentioned second control data additionally include data characterizing the sensitivity of at least one color sensor for different peak wavelengths.

4. The system according to claim 1, in which the mentioned second control data additionally include data describing the spectrum of the output radiation of the led light sources.

5. The system according to claim 1, in which the tool (30, 32) to obtain the temperature of each led light source includes a temperature sensor (30)adapted to measure the temperature of heat sink (36), placing these led light sources.

6. The system according to claim 5, in which the tool (30, 32) to obtain the temperature of each led light source further comprises a means (32) for calculating the temperature of each led lights-Senso is one of the light source based on at least the measured temperature of the heat sink and thermal model of multiple led light sources.

7. The system according to claim 1, in which indicated at least one color sensor are photodiodes with filters.

8. The method of controlling an led lighting device that includes multiple led light sources of different colors to obtain a mixed color light, the method includes the management of led light sources in accordance with the difference between the preset values for the said led light sources, representing a mixed color light having the desired color, and the first control data representing the color of the light mixed color, created with the help of these led light sources, the first control data is provided using at least one color sensor, characterized by obtaining the temperature of each led light source, and the compensation specified thresholds in the accordance with the second control data including the specified temperature of led light sources.

9. System for controlling an led lighting device that includes multiple led light sources of different colors for polucheniya mixed color the system includes a tool to control led light sources in accordance with the difference between the preset values for led light sources, representing a mixed color light having the desired color, and the first control data representing the color of the light mixed color, created with the help of these led light sources, the first control data is provided using at least one color sensor, characterized by means for obtaining the temperature of each led light source and a means to compensate for the above given values in accordance with second control data including the specified temperature of led light sources.

10. The system according to claim 1, in which many led light sources includes at least one led light source that outputs light having a first color, at least one led light source that outputs light having a second color, and at least one led light source that outputs light having a third color, and in which the first control data are provided more color sensors, each corresponds to one of the first, second and third colors.

11. The system of claim 10, additionally tereasa calibration matrix, configured to calculate the nominal duty cycle for each of the first, second and third colors, and in which the means for compensation of the set values in accordance with second control data includes the reference block, generating the specified values based on the calculated nominal operating cycles, and the reference block is the reference temperature at the transition for each led light source and configured for temperature compensation of the set values in accordance with the difference between the measured temperature of each led light source and the reference temperature of each led light source.

12. The system according to claim 11 in which the means for controlling the led light sources includes a comparator, and compares each one of the temperature offset set values with the output of one of the color sensors and outputs a signal of a difference.

13. The system of item 12, further containing a number proportional-integral-differential (PID) controllers, each corresponds to one of the colors and each takes one of the difference signals and in response outputs a control signal for one of the led light sources.

14. The system of item 13, further containing Comparators for comparing the adjustment work is his cycle of each of the signals the output of the PID controllers, with a corresponding one of the operating cycles of the calibration matrix.

15. The method according to claim 8, in which many led light sources includes at least one led light source that outputs light having a first color, at least one led light source that outputs light having a second color, and at least one led light source that outputs light having a third color, and in which the first control data are provided more color sensors, each corresponds to one of the first, second and third colors, the method further comprises calculating the nominal operating cycles for each of the first, second and third colors, and in which the compensation set values in accordance with second control data includes generating a set of values based on the calculated nominal operating cycles and temperature compensation set values in accordance with the difference between the measured temperature of each led light source and the reference temperature of each led light source.

16. The method according to clause 15, further containing a comparison of every one of the temperature offset set values with the output signal from one color d is tchikov and outputs a corresponding set of difference signals.

17. The system according to claim 9, in which many led light sources includes at least one led light source that outputs light having a first color, at least one led light source that outputs light having a second color, and at least one led light source that outputs light having a third color, and in which the first control data are provided more color sensors, each corresponds to one of the first, second and third colors, the system further comprises a calibration matrix, configured to calculate the nominal duty cycle for each of the first, second and third colors, and in which the means for compensation of the set values in accordance with second control data includes the reference block, generating the specified values based on the calculated nominal operating cycles, and the reference block is the reference temperature at the transition for each led light source and configured temperature offset set values in accordance with the difference between the measured temperature of each led light source and the reference temperature of each led light source.

18. System 17, in which the means for controlling the led light sources which contains Comparators, and compares each one of the temperature offset set values with the output signal of one of the color sensors and outputs a signal of a difference.

19. System p, optionally containing a number proportional-integral-differential (PID) controllers, each corresponds to one of the colors and each takes one of the difference signals and in response outputs a control signal for one of the led light sources.

20. The system according to claim 19, additionally containing Comparators to compare the adjustment of the operating cycle of each of the signals output PID controllers, with a corresponding one of the operating cycles of the calibration matrix.



 

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