LED drive circuit and lighting device

Abstract

The invention discloses an LED drive circuit and a lighting device. the LED drive circuit is used in an LED lighting device provided with an incandescent lamp controllable silicon dimmer, and comprises a rectifying and voltage stabilizing circuit, a square wave conversion circuit, and a PWM output circuit, wherein AC signals are inputted to the rectifying and voltage stabilizing circuit; the rectifying and voltage stabilizing circuit converts AC signals to DC signals, filters high-frequency signals, outputs the signals to the square wave conversion circuit, and provides power for the PWM output circuit; square wave signals converted by the square wave conversion circuit are inputted to the PWM output circuit; the PWM output circuit outputs PWM waves according to the duty ratio and the frequency of the square wave signals, and the PWM waves control the LED lighting device to work. According to the embodiment of the invention, the controllable silicon dimmer of the incandescent lamp can be used for performing dimming on the LED, controllable silicon dimmer waste on the incandescent lamp when the incandescent lamp is changed into the LED lighting device can be avoided, and in addition, when the LED drive circuit of the invention is used, the LED is free of stroboflash and jitter, the brightness ratio is adjustable, and the user experience is enhanced.

Description

technical field [0001] The invention relates to the field of LED lighting, in particular to an LED driving circuit and a lighting device. Background technique [0002] With the development of science and technology, LED lighting devices have become widely used as lighting sources in people's daily life due to their low energy consumption and high luminous efficiency. When using LED lighting devices instead of incandescent lamps, since incandescent lamps are pure resistance, LED lighting devices are Improper resistance, if the LED lighting device is directly dimmed by the thyristor dimmer of the incandescent lamp, it will cause flickering and jittering when the LED lights up. If we can continue to use the thyristor dimmer of incandescent lamps, we can not only avoid the waste caused by re-purchasing LED thyristor dimmers, but also maintain the user's usage habits. In addition, the existing LED thyristor dimmers Poor compatibility, complex circuit and high price. Therefo...

AI Technical Summary

Problems solved by technology

[0002] With the development of science and technology, LED lighting devices have become widely used as lighting sources in people's daily life due to their low energy consumption and high luminous efficiency. When using LED lighting devices instead of incandescent lamps, since incandescent lamps are pure resistance, LED lighting devices are Non-pure resistance, direct dimming of LED lighting devices with incandescent thyristor dimmers will cause flickering and jittering when LED lights up

If we can continue to use the thyristor dimmer for incandescent lamps, we can not only avoid the waste caused by repurchasing LED thyristor dimmers, but also maintain the user's usage habits. In addition, the existing LED thyristor dimmers Poor compatibility, complex circuit and high price

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