A multi-channel high-power LED drive circuit
An LED drive, high-power technology, applied in electrical components, energy-saving control technology, semiconductor lamps, etc., can solve the problems of precision influence, cross-connection of branches, and inability to realize the adjustment range.
Active Publication Date: 2021-09-14
XIDIAN UNIV
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Problems solved by technology
The disadvantage is that the PWM duty cycle controlled by the microcontroller and DSP is not continuous, and the 0-100% adjustment range cannot be realized, and the accuracy is affected by the speed of the controller
The disadvantage is that the working mode of the inductor current is CCM (continuous conduction mode), and the cross-connection of each branch is serious, and the average output current of each branch cannot be completely controlled independently.
Method used
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Embodiment 1
[0038] See figure 1 , figure 1 It is a schematic diagram of a multi-channel high-power LED driving circuit provided by an embodiment of the present invention. This embodiment provides a multi-channel high-power LED drive circuit. The multi-channel high-power LED drive circuit includes a feedback control module, a dimming module, a voltage regulation module, and an LED light-emitting path array module. The first output port of the feedback control module is connected to The input terminal of the dimming module, the second output port of the feedback control module is connected to the first input terminal of the voltage regulation module, the first output port of the dimming module is connected to the second input terminal of the voltage regulation module, and the second output port of the dimming module The port is connected to the first input end of the feedback control module, the third output port of the dimming module is connected to the first input end of the LED light-em...
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The invention discloses a multi-channel high-power LED driving circuit, comprising: a feedback control module, a dimming module, a voltage regulating module and an LED lighting path array module, the feedback control module is connected to the dimming module, and the feedback control module is connected to the voltage regulating module. The dimming module is connected to the voltage regulating module, the second output port of the dimming module is connected to the first input port of the feedback control module, the third output port of the dimming module is connected to the first input port of the LED light-emitting path array module, and the voltage regulating module's The output port is connected to the second input end of the LED light-emitting path array module, and the output port of the LED light-emitting path array module is connected to the second input end of the feedback control module. The multi-channel high-power LED drive circuit of the present invention realizes the time-division multiplexing of branch MOS tubes, and the dimming MOS tubes can realize dimming with a duty ratio of 0-100%, and at the same time, the voltage regulation module overcomes multiple output Issues with cross-effects, limited load capacity, and output voltage ripple.
Description
technical field [0001] The invention belongs to the technical field of LED driving circuits, and in particular relates to a multi-channel high-power LED driving circuit. Background technique [0002] With the increasing application of LED lighting in various scenarios, the requirements for LED drive circuits are getting higher and higher, and the requirements for the brightness of LEDs are also different in different scenarios, especially for smartphones that are near Distance lighting equipment has extremely high requirements on the color and brightness of light. Therefore, the development trend of LED drive circuits is to be able to perform more accurate and wider range dimming. At present, the low-power driving circuit of LED has been relatively mature, and the high-power driving circuit has limited its development due to factors such as conversion efficiency and cost, and cannot replace traditional lighting. However, it has a wide range of applications in special fields ...
Claims
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IPC IPC(8): H05B45/14H05B45/37
CPCY02B20/30Y02B20/40
Inventor 张艺蒙容广健张玉明宋庆文汤晓燕
Owner XIDIAN UNIV