LED silicon controlled rectifier dimming circuit

Abstract

The invention relates to an LED silicon controlled rectifier dimming circuit. The LED silicon controlled rectifier dimming circuit comprises a silicon controlled rectifier dimmer, an EMI filtering circuit, a rectifying bridge, a leakage circuit, a power supply management circuit and a transformer, wherein the output end of the silicon controlled rectifier dimmer is connected with the first input end of the EMI filtering circuit; the EMI filtering circuit is connected with the rectifying bridge; the rectifying bridge is connected with the leakage circuit; two voltage input ends of the leakage circuit are connected with the first end and the second end of a primary winding of the transformer respectively, and the second output end of the rectifying bridge is grounded; the input end of the power supply management circuit is connected with the first end of the primary winding; the power supply end of the power supply management circuit is connected with the first end of an auxiliary winding of the transformer; the second end of the auxiliary winding of the transformer is grounded; and a secondary winding of the transformer is used for being connected with an LED light source. The LED silicon controlled rectifier dimming circuit can be used for high-power LED silicon controlled rectifier dimming illumination equipment; and meanwhile, the LED illumination light-emitting efficiency can be ensured while a condition that the silicon controlled rectifier dimming illumination equipment does not flicker at low luminance can be satisfied.

Description

technical field [0001] The invention relates to the technical field of LED circuits, in particular to an LED thyristor dimming circuit. Background technique [0002] As the fourth-generation lighting source-LED, it has the characteristics of high light efficiency, long life and no pollution. With the advancement of the state's plan to ban the production and use of incandescent lamps, the market penetration rate of LED lighting has gradually increased. [0003] With the advancement of technology, LED lighting products are gradually becoming intelligent, which provides conditions for lamps to achieve secondary energy saving. LED lamps with dimming function are more and more widely used. There are three dimming methods for LED lamps in the market, namely: analog dimming, PWM dimming, and thyristor dimming. Among them, the thyristor dimming circuit is simple and easy to operate, and it is used for dimming LED replacement lamps without changing the original dimming circuit, so ...

AI Technical Summary

Problems solved by technology

[0006] Based on this, it is necessary to address the problem of low power supply efficiency of high-power LED lighting equipment, and provide a thyristor dimming circuit that improves power supply efficiency

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