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Dimmable LED driving power circuit with chip capacitor

A technology of LED drive and chip capacitor, applied in the field of dimmable LED drive power circuit, can solve problems such as restricting the service life of LED drive power, and achieve the effect of improving service life and reducing capacitance

Inactive Publication Date: 2016-12-07
傅崇辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional LED drive power uses electrolytic capacitors for filtering, and the service life of electrolytic capacitors is significantly lower than that of other electronic components, thus restricting the service life of LED drive power

Method used

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  • Dimmable LED driving power circuit with chip capacitor
  • Dimmable LED driving power circuit with chip capacitor

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0012] refer to figure 1 , a dimmable LED drive power supply circuit using chip capacitors, including:

[0013] The input circuit includes LC filter circuit, leakage protection circuit and bridge rectifier. The LC filter circuit is composed of inductor L1 and capacitor C1, and is used to reduce electromagnetic interference in the frequency range below 1MHz. Capacitors C2 and C3 are connected in parallel at both ends of C1 for leakage protection and static elimination. The rectifying device B1 converts the input alternating current into direct current. After the rectifier bridge, a small-capacity capacitor C4 is used to filter out high-frequency signals to achieve high power factor.

[0014] The flyback conversion circuit includes a fast recovery diode D1, a double-winding transformer L2 and a coupling capacitor C5, and outputs a smooth volt...

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PUM

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Abstract

The invention provides a dimmable LED driving power circuit with a chip capacitor. The circuit comprises an input circuit, a flyback conversion circuit and a dimming circuit, wherein the input circuit is composed of an LC filter circuit, an earth leakage protection circuit and a bridge rectifier; the flyback conversion circuit outputs smooth voltage waveform through a fast recovery diode D1, a double-winding transformer L2 and a coupling capacitor C5; a power MOSFET M1 provides a high-frequency direct-current pulse signal and is used for controlling and driving an LED lamp set to work, a multivibrator composed of NE555 and peripheral devices of NE555 provides a high-frequency direct-current pulse signal, and the brightness of the LED lamp set is adjusted by changing the duty ratio of the pulse signals. By means of energy conversion between the transformer and the capacitor, capacitance capacity is reduced, the chip capacitor replaces a large-capacity electrolytic capacitor, the service life of an LED power source is prolonged, and application and development of the LED illumination technology are benefited.

Description

technical field [0001] The invention relates to an LED power drive circuit, in particular to a dimmable LED drive power circuit using chip capacitors. Background technique [0002] Traditional LED drive power uses electrolytic capacitors for filtering, and the service life of electrolytic capacitors is significantly lower than that of other electronic components, thus restricting the service life of LED drive power. [0003] To sum up, the key to extending LED drive power is to replace electrolytic capacitors with chip capacitors with longer service life. The method of replacing large-capacity electrolytic capacitors with chip capacitors can improve the service life of LED power supplies and is conducive to the application of LED lighting technology. Contents of the invention [0004] The main technical problem to be solved by the present invention is to provide a dimmable LED drive power supply circuit using chip capacitors, which can replace large-capacity electrolytic ...

Claims

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Application Information

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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/37Y02B20/30
Inventor 傅崇辉
Owner 傅崇辉
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