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A led drive circuit with output current self-regulation capability

A technology of LED driving and output current, applied in electric light sources, electrical components, electroluminescent light sources, etc., can solve problems such as deterioration of working conditions, and achieve the effects of low THD, avoiding harmonic pollution, and high PF.

Active Publication Date: 2020-11-03
SHENZHEN SOSEN ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still cannot avoid the long-term operation of the LED in a state that is larger than the rated current, and as the number of open circuit branches increases, the working status of the remaining LEDs will gradually deteriorate.

Method used

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  • A led drive circuit with output current self-regulation capability
  • A led drive circuit with output current self-regulation capability
  • A led drive circuit with output current self-regulation capability

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Embodiment Construction

[0040] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be pointed out that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all those skilled in the art can obtain without creative work. Other embodiments all belong to the protection scope of the present invention

[0041] Such as figure 1 As shown, this embodiment provides an LED drive circuit with output current self-adjustment capability, including a single-phase AC input power supply Uin, a single-phase rectifier bridge DB1, a first power switch tube S1, a second power switch tube S2, a second power switch tube S2, a A power diode D1, a second power diode D2, a first inductor L1, a first capacitor C1, a second capacitor C2, a high-frequency transformer T, a first current sampling resistor ...

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Abstract

The invention discloses an LED drive circuit with output current self-adjustment capability, which comprises a single-phase AC input power supply, a rectifier bridge, a first power switch tube, a second power switch tube, a first power diode, a second power diode, a second power switch tube, and a second power switch tube. An inductor, a first capacitor, a second capacitor, a high-frequency transformer, a first current sampling resistor, a second current sampling resistor, a first voltage sampling resistor, a second voltage sampling resistor, a third voltage sampling resistor, and a fourth voltage sampling resistor , snubber resistor, snubber capacitor, snubber diode, active power factor correction module. The invention proposes a solution to solve the problem that LEDs work in the state of over-rated current for a long time due to the disconnection of parallel branch circuits. With the characteristics of high stability and safety, it is suitable for the control of various LED lighting circuits.

Description

technical field [0001] The invention belongs to the field of LED driving and relates to an LED driving circuit capable of self-adjusting output current in response to LED damage. [0002] technical background [0003] With the rapid development of the power industry and power electronics technology, the depletion of traditional fossil energy and the deteriorating climate, energy conservation and environmental protection have become the focus of global attention. With the rapid development of semiconductor technology, LED has stepped into people's sight as a new light source. LED has the characteristics of small size, low calorific value, low power consumption, long life, and fast response. When LED shines, LED drive power supply is the guarantee for the development of LED industry chain, and the quality of LED drive power supply directly affects the reliability of LED products. [0004] The exponential volt-ampere characteristic curve of LED determines that it is better to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B45/30H05B45/355H05B45/345H05B44/00
CPCH05B45/40H05B45/50H05B45/37
Inventor 刘毓鑫关远鹏王宗友邹超洋谢运祥
Owner SHENZHEN SOSEN ELECTRONICS CO LTD
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