A thyristor dimming bleeder circuit

Abstract

The invention discloses a thyristor dimming Bleeder circuit, which includes a rectifier circuit, a filter circuit, a Bleeder circuit and a dimming control circuit. The dimming control circuit includes a driver U31 and a peripheral control circuit electrically connected to each pin of the driver U31. , the input end of the rectification circuit is electrically connected to the power supply, the output end of the rectification circuit is electrically connected to the input end of the recording and broadcasting circuit, the output end of the filter circuit is electrically connected to the input end of the Bleeder circuit, the output end of the Bleeder circuit is electrically connected to the lead of the driver U31 Pin 5 is electrically connected; the positive output terminal X+ of the peripheral control circuit is electrically connected to the positive terminal of the LED light string, and the positive output terminal X‑ of the peripheral control circuit is electrically connected to the negative terminal of the LED light string. In this solution, by adding a Bleeder line to the thyristor dimming solution line, the dimming depth can be increased, flickering can be avoided, and the dimming effect can be improved.

Description

technical field [0001] The invention relates to the technical field of LED dimming, in particular to a thyristor dimming Bleeder circuit. Background technique [0002] LED dimming is an important part of the use of lighting today. People are no longer satisfied with lighting only for lighting. Through the dimming of LEDs, lights can produce multiple functions, such as color changes, such as creating a more comfortable environment, such as adjusting the brightness of lights, etc., and reducing unnecessary electric light, so as to further achieve energy saving and emission reduction These can be achieved by dimming, and most LED dimming is dimmed by controlling the power supply. There are three main methods of LED dimming: the first is PWM dimming power supply; the second is LED dimming. 0 / 1-10V dimming power supply; the third is LED thyristor dimming power supply. [0003] Thyristor dimming is a kind of physical dimming. Starting from AC phase 0, the input voltage is choppe...

AI Technical Summary

Problems solved by technology

The principle is to adjust the conduction angle of each half-wave of alternating current to change the sinusoidal waveform, thereby changing the effective value of the alternating current, so as to achieve the purpose of dimming; the advantages of using thyristor dimmers on LED lighting are: The cost of dimming is low, and the disadvantage is that the thyristor has poor dimming performance, which usually leads to a narrowing of the dimming range. Because of the property of the thyristor half-controlled switch, it only has the function of turning on the current, and cannot completely shut off the current, even if it is adjusted to the lowest There is still a weak current passing through, and the micro-current light-emitting characteristics of LEDs make it difficult for the current LED dimming methods to promote LED dimming. The silicon dimming solution has defects such as poor compatibility, poor dimming effect, and insufficient dimming depth.

[0004] At present, there are many thyristor dimming solutions that have defects such as poor compatibility, poor dimming effect, and insufficient dimming depth.

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