Anti-stroboscopic led power supply circuit

Abstract

The invention relates to a power supply circuit, in particular to an anti-flicker LED power supply circuit. The circuit includes: a first branch connected to the mains, in which a first AC / DC conversion module is installed; a second branch connected to the mains, in which a waveform correction module is arranged, and the waveform The correction module is connected to the second AC-DC conversion module, and the second AC-DC conversion module and the first AC-DC conversion module are connected in parallel to the mains line; the waveform synthesis module, the waveform synthesis module and the first AC-DC conversion module and the waveform The output end of the correction module is connected, and the output end of the waveform synthesis module is connected to the LED module. The invention controls the power supply voltage curve, thereby eliminating the light and dark changes of the LED module during use, thereby achieving the effect of anti-flicker; and the waveform correction module is powered separately, which has little impact on the main circuit and improves the safety of the overall circuit. The power factor reduces the useless power.

Description

technical field [0001] The invention relates to a power supply circuit, in particular to an anti-flicker LED power supply circuit. Background technique [0002] With the development and popularization of LED, more and more light sources use LED to replace the traditional light source. When the LED light source is working, because the LED works under the condition of direct current, while the general mains is alternating current, the power supply circuit of the LED Among them, a bridge rectifier circuit is generally used to convert the AC and DC power supply, and then supply the working current of the LED. This is a common practice in the industry now. However, if figure 1 As shown, since the voltage output curve of the usual alternating current is a sinusoidal waveform curve composed of positive and negative periods, after being converted by a bridge rectifier circuit, although the curve of the negative period can be mirrored to the positive period, it forms as figure 2 As...

AI Technical Summary

Problems solved by technology

However, since the filter circuit generally includes capacitors, inductors and other devices, the circuit composed of such devices is an impure resistance circuit, which will cause a 90° phase shift between the voltage and current, so this type of circuit will greatly reduce the power factor of the circuit. Cause useless power to increase, and the utilization rate of electric energy is low

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