Multi-channel high-power LED drive circuit

Abstract

The invention discloses a multi-channel high-power LED drive circuit comprising a feedback control module, a dimming module, a voltage regulating module and an LED luminous path array module. The feedback control module is connected with the dimming module. The feedback control module is connected with the voltage regulating module. The dimming module is connected with the voltage regulating module. The second output port of the dimming module is connected with the first input of the feedback control module. The third output port of the dimming module is connected with the first input end of the LED luminous path array module.The output port of the voltage regulating module is connected with the second input end of the LED luminous path array module.The output port of the LED luminous patharray module is connected with the second input end of the feedback control module. The multi-channel high-power LED driving circuit realizes the time-sharing multiplexing of the branch MOS tube, andthe dimming MOS tube can realize 0-100% duty cycle dimming.Meanwhile, the voltage regulating module overcomes the problems of cross influence, limited carrying capacity and output voltage ripple of multiple outputs.

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 ...

AI Technical Summary

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.

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