Floating buck-boost PFC circuit and LED driving power supply

A buck-boost, floating technology, applied in the field of power electronics, can solve the problems of high cost, large product volume, high cost, etc., and achieve the effect of low product cost, simple circuit and high conversion efficiency

Active Publication Date: 2021-02-12
SHENZHEN FAHOLD ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Meet the requirements of capacitor life and ripple current. At present, the technical bottleneck of commercial single electrolytic capacitors is less than 600V working voltage. The common practice is to use multiple 400V~450V capacitors in series and

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  • Floating buck-boost PFC circuit and LED driving power supply
  • Floating buck-boost PFC circuit and LED driving power supply

Examples

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[0021]In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiment of the invention is shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0022]Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

[0023]In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood...

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Abstract

The invention relates to a floating buck-boost PFC circuit and an LED driving power supply. The floating buck-boost PFC circuit comprises a filter circuit, a rectifier bridge, a PFC control chip, a voltage sampling circuit and a PFC correction circuit, and the PFC correction circuit comprises a switching tube Q1 and a switching tube Q2 with withstand voltage of 600V-650V, an energy storage inductor T1, a fly-wheel diode D0, a fly-wheel diode D1, an electrolytic capacitor E1 with withstand voltage of 400V-450V, a resistor R0 and a capacitor C1. The LED driving power supply comprises a DC/DC conversion circuit, an LLC control chip, an LED voltage/current sampling circuit and the floating buck-boost PFC circuit. Compared with the traditional PFC circuit, the floating buck-boost PFC circuit provided by the invention has the characteristics of simple circuit, few devices, high conversion efficiency, higher stability and lower product cost.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a floating buck-boost PFC circuit and an LED driving power supply. Background technique [0002] Usually, the DC voltage rectified by the grid input 480Vac rectifier bridge is close to 680V (480x1.414). Considering the 10% margin of the conventional design, the DC voltage of the circuit will be close to 750V. Meet the requirements of capacitor life and ripple current. At present, the technical bottleneck of commercial single electrolytic capacitors is less than 600V working voltage. The common practice is to use multiple 400V~450V capacitors in series and parallel connection, which will lead to high cost and low product quality. The volume is large; in addition, the voltage of the semiconductor switching tubes used also needs to be raised from 600V to 650V to a process level of 900 to 1KV, resulting in higher costs. Contents of the invention [0003] The technical pr...

Claims

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Application Information

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IPC IPC(8): H05B45/355H05B45/375H05B45/38H05B45/37
CPCH05B45/355H05B45/375H05B45/38H05B45/37Y02B20/30Y02B70/10H02M1/4233H02M3/1582
Inventor 黄辉腾吴专红林家飞
Owner SHENZHEN FAHOLD ELECTRONICS CO LTD
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