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LED driving circuit for illumination

A technology of LED drive and LED light string, which is applied in the direction of lighting devices, lamp circuit layout, electric light source, etc., and can solve problems such as increased loss, incompatible use, and complicated circuits.

Inactive Publication Date: 2010-06-09
SHENZHEN BOSTAR INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing LED drive circuits for lighting generally use some independent active constant current circuits to drive LED light strings, which have complex circuits and high costs. The defect of compatible use; in addition, when it is used to simulate ordinary fluorescent tubes, it will also increase power loss, because ordinary fluorescent lamp holders have their own drive circuits, and the existing LED active constant current circuits will consume energy again. Energy conversion increases loss, so the user only has to remove the original ballast circuit of the ordinary fluorescent lamp holder, and the LED driver can perform energy conversion with maximum efficiency, which will cause difficulties for users to install, and in addition, it will also generate various new electromagnetic interferences, such as Need to pass the electromagnetic compatibility standard independently, and need to independently deal with various interferences from the power grid such as lightning strikes

Method used

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Embodiment Construction

[0009] The present invention will be described in detail below in conjunction with accompanying drawing, figure 1 The present invention shown mainly includes: a high-frequency capacitor 1 connected in series to the AC input end of the high-frequency full-bridge rectifier 2, the full-bridge rectifier 2 and a high-frequency capacitor 3 connected in parallel to the output end of the full-bridge rectifier 2. One leg of the high-frequency capacitor 1 is connected to one pin 4a and 4b of the fluorescent tube 7; one AC input terminal of the high-frequency full-bridge rectifier 2 is connected to the other pin 5a and 5b of the fluorescent tube, and the output terminal of the high-frequency full-bridge rectifier 2 It is directly connected in parallel with the LED light string 6 and provides electric energy therefor.

[0010] This circuit can be applied to fluorescent lamp stands equipped with high-frequency electronic rectifiers and low-frequency inductive rectifiers at the same time, b...

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Abstract

The invention discloses an LED driving circuit for illumination, comprising a high frequency full-bridge rectifier, a series capacitor connected with an AC input end of the full-bridge rectifier, and a parallel capacitor connected with an output end of the full-bridge rectifier; one end of the capacitor connected with the full-bridge rectifier in series and one AC input end of the full-bridge rectifier are respectively connected with contact pins at the two ends of a fluorescent light tube; and the parallel capacitor at the output end of the full-bridge rectifier is simultaneously connected with an LED lamp string in parallel. The LED driving circuit skillfully utilizes the original ballast of a fluorescent light bracket, leads non-loss constant current power supply operation to be carried out on the LED lamp string, and has the advantages of simple structure, extremely low cost, stable performance, etc.

Description

technical field [0001] The invention relates to an LED drive circuit for lighting, specifically a new method of using LED light strings to replace ordinary fluorescent tubes, which belongs to the LED lighting technology. Background technique [0002] Existing LED drive circuits for lighting generally use some independent active constant current circuits to drive LED light strings, which have complex circuits and high costs. The defect of compatible use; in addition, when it is used to simulate ordinary fluorescent tubes, it will also increase the power loss, because the ordinary fluorescent lamp itself has its own drive circuit, and the existing LED active constant current circuit will consume energy again. Energy conversion increases loss, so the user only has to remove the original ballast circuit of the ordinary fluorescent lamp holder, and the LED driver can perform energy conversion with maximum efficiency, which will cause difficulties for users to install, and in addi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02H02M7/08H02M1/12H02M1/14
Inventor 刘则锋
Owner SHENZHEN BOSTAR INDAL