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Driving circuit for 220V AC LED lamp

A technology for driving circuits and LED lights, applied in the field of lighting, can solve the problems of unstable output current, grid interference, complicated circuits, etc., and achieve the effects of stable and soft light intensity, high reliability and simple circuit.

Inactive Publication Date: 2005-10-26
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such as "LED lighting driver" (Chinese patent, application number: 01252414.X), "LED ultra-wide voltage driver" (Chinese patent, application number: 00255776.2), "LED lighting driver" (Chinese patent, application number: 00255776.2) proposed by Lin Wenwen. Application No.: 03254582.7), these circuits are complex, low in efficiency, poor in reliability, and high in cost; Xu Yongxiang's "A LED Drive Circuit Structure Improvement" (Chinese Patent, Application No.: 03252283.5) uses capacitor rectification, and the output current is unstable , poor reliability; Zhai Zhongyi's "AC power supply LED lamps" (Chinese patent, application number: 200420024504.9), adopts the resistance step-down method, the output current is unstable, and the efficiency is poor; and the application-specific integrated circuit is used, such as the HV9910 of SUPERTEX company. The LED lamp driving circuit is actually a switching power supply circuit, which is easy to cause interference to the power grid, complicated circuit, and high cost

Method used

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  • Driving circuit for 220V AC LED lamp
  • Driving circuit for 220V AC LED lamp

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Embodiment Construction

[0011] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0012] Embodiment of the driving circuit of the 220V AC LED lamp of the present invention:

[0013] Such as figure 2 As shown, the step-down current-limiting circuit adopts the inductance coil L to convert the 220V AC into a low-voltage low-current (current-limiting) output, and obtains a DC through the rectifier circuit composed of the rectifier bridge D1~4, and then filters through the filter capacitor C to obtain a more stable The DC output of the DC output is to the LED array, and the voltage limiting protection circuit is realized by the Zener diode Dz. The voltage stabilization value of the Zener diode Dz is selected to be slightly higher than the working voltage of the LED array. In the normal working state, Dz is in the cut-off state. It can avoid damage to LED array and filter capacitor due to excessive output voltage.

[0014] Since the inductance has th...

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Abstract

This invention discloses a drive circuit of 220V AC LED lamp including a commutating circuit, the AC side of which is serial to a step-down current-limiting circuit composed of inductance coils, the DC side is parallel with a filter circuit composed of capacitors, a voltage-limiting protection circuit composed of Zener diodes and a LED array. The commutating circuit is composed of diode commutating bridge. The LED array is composed of multiple serial LEDS or first of all, multiple LEDS are serial then parallel.

Description

technical field [0001] The invention relates to the lighting field, in particular to a circuit of a lighting lamp used in daily life. Background technique [0002] Semiconductor light-emitting diodes (LEDs) are rapidly gaining popularity and application due to their high efficiency, long life, safety, and environmental protection, which are incomparable to other light sources. However, LEDs require low-voltage DC power supply and cannot be directly connected to the daily 220V AC power supply. A special ballast circuit is required. . Many people have designed various 220V AC LED lamp drive circuits, and even special integrated circuits have appeared. Such as "LED lighting driver" (Chinese patent, application number: 01252414.X), "LED ultra-wide voltage driver" (Chinese patent, application number: 00255776.2), "LED lighting driver" (Chinese patent, application number: 00255776.2) proposed by Lin Wenwen. Application No.: 03254582.7), these circuits are complex, low in efficie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/00
Inventor 李刚林凌
Owner TIANJIN UNIV
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