LED dimming circuit and LED lamp

Abstract

The invention belongs to the technical field of LED driving, and particularly relates to an LED dimming circuit and an LED lamp. The LED dimming circuit comprises a silicon controlled dimming module, a rectification filtering module, an input voltage detecting module, a control module, an output current sampling resistor, a degaussing detecting module and a voltage reducing module, wherein the silicon controlled dimming module, the rectification filtering module and an LED load are connected in sequence, the rectification filtering module is further connected with the input voltage detecting module and the voltage reducing module, the control module is connected with the voltage reducing module, and the control module is further connected with the input voltage detecting module, the degaussing detecting module and the output current sampling resistor and is connected and disconnected according to received signals to control the voltage reducing module to supply power for the LED load. Due to the fact that the processing of rectification, filtering, voltage reduction and constant current are carried out on currents output by the silicon controlled dimming module, the LED load cannot flicker in the working process, and the manufacturing cost of the LED lamp is lowered.

Description

technical field [0001] The invention belongs to the technical field of LED driving, and in particular relates to an LED dimming circuit and an LED lamp. Background technique [0002] Thyristor dimming is the mainstream method in the field of stage lighting and ambient lighting. Compared with transformers and resistors, thyristor dimmers have a completely different dimming mechanism. [0003] For ordinary reverse blocking thyristor, its thyristor characteristic is that when the thyristor is applied with forward anode voltage and at the same time with appropriate forward control voltage, the thyristor is turned on; It will be maintained even after the gate control voltage is removed, and it will not be turned off until the reverse anode voltage is applied or the anode current is less than the holding current of the thyristor itself. Ordinary thyristor dimmers use this characteristic of thyristor to realize leading-edge trigger phase-controlled voltage regulation. At a certa...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide an LED dimming circuit, aiming to solve the problem that the existing thyristor dimming circuit will cause LED lights to flicker

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