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Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function

A technology of intelligent dimming and constant current drive, which is applied in the electronic field to achieve the effect of improving power utilization, high conversion efficiency and good stability

Inactive Publication Date: 2010-09-15
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the report of the flyback LED constant current drive power supply with simple structure, input power factor correction (PFC) function and PWM dimming function has not been verified yet.

Method used

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  • Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function
  • Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function
  • Fly-back street lamp illumination LED constant-current driving power supply with intelligent dimming function

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Embodiment Construction

[0019] A flyback street lighting LED constant current drive power supply with intelligent dimming function, such as figure 1 As shown, it consists of four parts: rectification filter circuit, front-stage flyback DC-DC constant voltage source circuit, rear-stage DC-DC constant current source circuit, and intelligent PWM dimming control circuit.

[0020] The rectification and filtering circuit is composed of a bridge rectifier B1 and a high-frequency filtering small capacitor C1. The small capacitor C1 realizes the rectification and filtering of the input mains power. The first output terminal A of the bridge rectifier B1 outputs a DC voltage, and the second output terminal B is grounded to GDN.

[0021] The pre-stage flyback DC-DC constant voltage source circuit consists of the power management chip NCP1653 of ON Semiconductor, an isolated switching transformer T1, an optocoupler U1, resistors R1, R2, R3, R4, capacitors C2, C3, C4, diode D1, MOS switch tube Q1 and a 15V DC po...

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Abstract

The invention belongs to the technical field of electronics, and relates to a street lamp illumination LED driving power supply. The street lamp illumination LED driving power supply consists of a rectification filter circuit, a pre-stage fly-back DC-DC constant voltage source circuit, a post-stage DC-DC constant current source circuit and an intelligent PWM dimming control circuit, wherein the pre-stage fly-back DC-DC constant voltage source circuit consists of a power factor correction (PFC) and PWM control chip NCP1653, a light-coupled isolation detection circuit and an isolation switchingtransformer, and realizes input power factor correction and AC input-to-DC constant voltage output function together with the rectification filter circuit; and the pre-stage DC-DC constant current source circuit is a multi-path constant current output circuit, and each path of constant current output circuit is a Buck-type DC-DC converter with the same structure and realizes conversion from constant voltage to constant current. The intelligent PWM dimming control circuit controls the working state of each path of constant current output circuit through multi-path different control signals to realize intelligent dimming. Compared with the conventional common LED street lamp illumination driving power supply, the street lamp illumination LED driving power supply can save a large amount of peripheral circuits, has the advantages of low cost, small volume, intelligent controllable dimming and the like, and is suitable for batch production.

Description

technical field [0001] The invention belongs to the field of electronic technology, and relates to a street lighting LED driving power supply. Background technique [0002] LED lighting technology has the advantages of energy saving, environmental protection, long life and easy control, and is one of the most promising high-tech fields in the 21st century. Under the bright prospect of the LED lighting industry, the driving power supply of various LED lamps is also developing rapidly for different applications in the lighting field. Most of the existing LED driving power supply adopts switching power supply technology. With the development of technology, a drive circuit with an isolated structure and a power factor correction (PFC) function appears, which greatly improves the reliability and power utilization efficiency of the LED drive circuit. In addition, the characteristics of LED determine that to keep its brightness constant and prevent burnout, it is an ideal method t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B37/02
CPCY02B20/72Y02B20/40Y02B20/48
Inventor 罗萍李志兵庞振洋肖强胡烽王庆云
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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