A multi-channel accurate and adjustable constant current led drive circuit

Abstract

The invention relates to a multi-channel accurate and adjustable constant current LED driving circuit, which includes a control signal input module, the output terminal of the control signal input module is connected to the signal processing module, and the output terminal of the signal processing module is respectively connected with the current adjustment module, the four-way The constant current module is connected, the input end of the signal processing module is also connected with the PWM module, the output of the four-way constant current module is connected to output interface 1 and output interface 2, and the driving circuit is also connected to a DC input power supply. A multi-channel accurate and adjustable constant current LED drive circuit proposed by the present invention can realize independent adjustment of LED brightness when the control signal individually controls each LED to flash (or keep on); when the control signal controls 4 LEDs at the same time, The brightness of the LED can be changed at the same time through the PWM adjustment potentiometer, or the brightness of the LED can be changed separately through the potentiometer of the current adjustment module.

Description

technical field [0001] The invention relates to the technical field of LED drive circuits, in particular to a multi-channel precisely adjustable constant current LED drive circuit. Background technique [0002] LED is a nonlinear element, which is easily affected by voltage fluctuation and other factors, so it is generally driven by constant current. The existing constant current scheme generally uses PWM pulse width modulation signal to change the brightness of LED. This scheme needs to keep the LED always on, which cannot be achieved. It can also adjust the LED brightness while turning on or off the LED at any frequency. Contents of the invention [0003] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a multi-channel precisely adjustable constant current LED drive circuit to solve the existing technical problem that the LED brightness cannot be adjusted while turning on or off the LED at any frequency. [0004] The...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned deficiencies of the prior art, the present invention proposes a multi-channel precisely adjustable constant current LED drive circuit, which solves the existing technical problem that it is impossible to turn on or off the LED at any frequency and at the same time adjust the brightness of the LED.

Images