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A led drive circuit

A technology of LED drive and LED light group, applied in the field of lighting, can solve the problems of complex circuit, high-frequency interference, high cost, etc., achieve the effect of stable output voltage and current, and reduce electromagnetic interference

Inactive Publication Date: 2017-07-28
YANCHENG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, DC-DC chopping technology is used to drive LED in low-voltage places. It has the advantages of low power consumption, high efficiency, stability and reliability, etc., but its cost is high, the circuit is complex, easy to damage, and has strong high frequency. Defects such as interference have brought inconvenience to users

Method used

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  • A led drive circuit
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Embodiment

[0013] Embodiment: This embodiment provides a LED drive circuit, such as figure 1 As shown, it includes an overcurrent protection circuit 1 , an EMI protection circuit 2 , a rectification circuit 3 , a constant current control circuit 4 , and an LED lamp group 5 .

[0014] like figure 2 As shown, the overcurrent protection circuit 1 includes a fuse, and the EMI protection circuit 2 includes a capacitor C1, a capacitor C2, an inductor L1, and an inductor L2. The capacitor C1 is connected in series at one end of the inductor L1 and the inductor L2, and the capacitor C2 is connected in series between the inductor L1 and the inductor. At the other end of L2, the rectifier circuit 3 adopts a bridge rectifier circuit, wherein terminals 1 and 2 of the bridge rectifier circuit are the input terminals of the rectifier power supply, terminals 3 and 4 are output terminals of the rectifier circuit, and the constant current control circuit 4 includes Power chip U1, transformer T, MOS tub...

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Abstract

The invention discloses an LED driving circuit, comprising an overcurrent protection circuit (1), an EMI protection circuit (2), a rectifier circuit (3), a constant current control circuit (4), and an LED lamp group (5). When the power supply voltage fluctuates, the current of the LED drive circuit can still be kept fluctuating within a small range, and the constant current control circuit can play an automatic adjustment role when the system is disturbed, so that the output voltage and current are stable, and the constant current characteristic is maintained. On the premise, the electromagnetic interference is greatly reduced.

Description

technical field [0001] The invention relates to the lighting field, in particular to an LED driving circuit. Background technique [0002] With the development of science and technology, LED, as a new type of light source, has the advantages of small size, low power consumption, high light efficiency, long life, environmental protection, etc., and is widely used in the field of lighting, and various LEDs have emerged The driving circuit, in practical applications, the driving current of the LED light source has a direct impact on the luminous efficiency and life. [0003] At present, DC-DC chopping technology is used to drive LED in low-voltage places. It has the advantages of low power consumption, high efficiency, stability and reliability, etc., but its cost is high, the circuit is complex, easy to damage, and has strong high frequency. Defects such as interference have brought inconvenience to users. In the application, the LED drive circuit needs to maintain the const...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 夏菽兰王吉林
Owner YANCHENG INST OF TECH