LED fluorescent lamp and power circuit thereof

Abstract

The invention provides a light-emitting diode (LED) fluorescent lamp and a power circuit thereof. The LED fluorescent lamp has better radiating effect and luminous stability. The LED fluorescent lamp comprises a shell, an LED lamp bar and a power circuit, wherein the power circuit is electrically connected with the LED lamp bar and provides working voltage for the LED lamp bar; the LED lamp bar and the power circuit are arranged inside the shell; the power circuit comprises a filtering circuit, a rectifying circuit, a power factor correction circuit, a step-down conversion circuit and a constant-current control circuit which are electrically connected in turn; and after alternating current (AC) voltage is input into and filtered by the filtering circuit, the AC voltage is converted into high-voltage direct current through the rectifying circuit and the power factor correction circuit, and is reduced by the step-down conversion circuit and output to the LED lamp bar, and the constant-current control circuit samples the output current through a control chip.

Description

technical field [0001] The present invention relates to a fluorescent lamp, and in particular to an LED (light-emitting diode, light-emitting diode) fluorescent lamp with better heat dissipation and strong luminous stability and a power supply circuit thereof. Background technique [0002] In daily life, we can see fluorescent lamps everywhere. Compared with incandescent lamps, fluorescent lamps have the characteristics of better illumination and energy saving, so they are widely used. However, traditional fluorescent lamps contain a large amount of mercury vapor. If the lamp is broken, the mercury vapor will volatilize into the atmosphere and cause environmental pollution. Secondly, the traditional fluorescent lamp uses alternating current, so it will generate 100-120 stroboscopic flashes per second, which is harmful to the eyes when used; in addition, the traditional fluorescent lamp is lit by the high voltage released by the rectifier. At that time, traditional fluoresce...

AI Technical Summary

Problems solved by technology

However, to achieve the effect of ordinary fluorescent lamps, the common LED fluorescent lamps on the market generally need hundreds of LEDs to be connected together, and the heat dissipation is limited by the aluminum shell of the lamps, and there is no better heat dissipation material at present. to replace

[0004] In addition, in the process of emitting light, LED fluorescent lamps may experience unstable light emission, which shortens the life of LED fluorescent lamps.

To sum up, the LED lamps in the prior art have problems of heat dissipation and unstable lighting.

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