LED multi-channel parallel drive circuit

Abstract

An LED multi-channel parallel drive circuit includes a rectifier bridge module, an RC module, a plurality of LED modules, a plurality of current equalization control modules, a constant current control module and a first resistor. The input terminal of the rectifier bridge module is connected to the power signal; the RC module is connected to the output terminal of the rectifier bridge module; multiple LED modules are connected to the output terminal of the rectifier bridge module, and multiple LED modules are connected in parallel; The input terminal of the current control module is connected to multiple LED modules in a one-to-one series connection; the input terminal of the constant current control module is connected to the output terminals of multiple current sharing control modules, and the output terminal of the constant current control module is grounded; and The first end of the first resistor is connected to the control end of the constant current control module, and the second end of the first resistor is grounded; wherein, each current sharing control module makes the current flowing through each LED module tend to a preset output current.

Description

technical field [0001] The invention relates to the field of LED lighting, in particular to an LED multi-channel parallel driving circuit. Background technique [0002] Generally speaking, LED light source driving methods are mainly divided into low-voltage driving and high-voltage driving. Because high-voltage driving can improve the efficiency and power factor of the power supply, save costs, and save transformers and electrolytic capacitors to facilitate automated production, so At present, the mainstream in the market is high-voltage linear drive. [0003] However, the conduction current of the high-voltage linear driver chip in the prior art is 40-60mA, which is too wasteful to be used in a 10mA system. Therefore, a high-voltage linear driver chip is generally used to drive multiple LED lights in series and parallel to reduce costs. However, when using a high-voltage linear driver chip to directly drive multiple LED lamp strings, due to the deviation of the forward con...

AI Technical Summary

Problems solved by technology

[0003] However, the conduction current of the high-voltage linear driver chip in the prior art is 40-60mA, which is too wasteful to be used in a 10mA system. Therefore, a high-voltage linear driver chip is generally used to drive multiple LED lights in series and parallel to reduce costs.

However, when using a high-voltage linear driver chip to directly drive multiple LED lamp strings, due to the deviation of the forward conduction voltage between each LED lamp bead, there will be a significant difference in the current between the LED lamp bead strings, which will affect the The overall luminous flux of the lamp and the working life of the lamp bead

Images