High-power LED structure
A LED structure, high-power technology, applied in the use of semiconductor lamps, electroluminescent light sources, electric light sources, etc., can solve the problems of brightness changes, output brightness reduction, junction temperature rise, etc., to achieve stable brightness, easy maintenance, and structure simple effect
Active Publication Date: 2020-12-11
ZUMAX MEDICAL
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Problems solved by technology
At the same time, the higher the brightness will cause the junction temperature to rise, which will cause the reduction of the output brightness.
[0005] The traditional LED lamp is driven by constant current, and the driving current of the LED is changed according to the change of the resistance value of the potentiometer to achieve the purpose of dimming. This driving method supplies a constant current to the LED when the potentiometer is rotated to the specified position, but due to The nonlinear relationship between LED brightness and driving current, and the brightness change caused by junction temperature changes under different currents, so LEDs cannot achieve constant brightness, which will affect the application of LEDs in some occasions that require high brightness accuracy
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[0035] Below in conjunction with accompanying drawing and embodiment example, the present invention will be further described:
[0036] Such as figure 1 Shown: a dimming method of high-power LED, including:
[0037] (1) Real-time collection of high-power LEDs includes: potentiometer voltage signal V R , illuminance corresponding voltage signal V L , the current corresponds to the voltage signal V I , the voltage signal V corresponding to the illumination after acquisition L , the current corresponds to the voltage signal V I zoom in;
[0038] (2), according to the voltage signal V R , V L and V I Calculate the corresponding digital quantity D R 、D L and D I , according to the digital quantity D R Calculate the set brightness value L 1 , according to the digital quantity D L Calculate the actual brightness value L 2 , according to the digital quantity D I Calculate the actual current value I a ;
[0039] (3), determine L 1 +(L 1 -L 2 ) corresponding to the ...
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The invention relates to a high-power LED structure, and the structure comprises a high-power LED and a dimming system; the dimming system comprises a power supply, a driving circuit, an illuminance sampling and amplifying circuit, a current sampling and amplifying circuit, a potentiometer and a main control chip; during dimming, a voltage signal VR of the potentiometer , an illuminance corresponding voltage signal VL and a current corresponding voltage signal VI are collected; digital values DR, DL and DI are calculated according to VR, VL and VI, and a set brightness value L1, an actual brightness value L2 and an actual current value Ia are calculated according to DR, DL and DI; a current value Is corresponding to L1 + (L1-L2) is determined, and the driving current of the high-power LEDis not adjusted when Is is equal to Ia; when Is is not equal to Ia, the driving current of the high-power LED is adjusted according to Is. The LED structure is simple, easy to maintain, stable in brightness and applied to occasions with high brightness accuracy, and achieves the transformation of an existing LED drive.
Description
[0001] The present invention is a divisional application with an application date of January 19, 2017, an application number of 2017100388538, and an invention name of a high-power LED dimming method and dimming system. technical field [0002] The invention relates to a high-power LED structure. Background technique [0003] High-power LED refers to a light-emitting diode with a large rated operating current. The power of ordinary LEDs is generally 0.05W, and the working current is 20mA, while high-power LEDs can reach 1W, 2W, or even tens of watts, and the working current can range from tens of milliamperes to hundreds of milliamperes. Due to the constraints of high-power LEDs in terms of luminous flux, conversion efficiency and cost, it is determined that the short-term application of high-power white LEDs is mainly lighting in some special fields, and the medium and long-term goal is general lighting. [0004] The output brightness of the LED lamp is not only related to...
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IPC IPC(8): H05B45/345H05B45/325H05B45/30H05B45/10H05B47/11H05B47/165H05B44/00
CPCH05B45/10H05B45/345H05B45/325H05B45/30H05B47/11H05B47/165Y02B20/40
Inventor 黄彬杨晓华陈小甜
Owner ZUMAX MEDICAL