多输出反激式开关电源同步整流技术

doi:10.16180/j.cnki.issn1007-7820.2022.10.003

Abstract

Abstract:

In the flyback switching power supply, the traditional diode rectification method has large rectification loss, low efficiency, and poor cross-regulation characteristics of multiple outputs. To solve this problem, synchronous rectification technology is used to investigate the multi-output flyback switching power supply. The synchronous rectification technology of flyback converter and its driving method are analyzed, and chip UCC24610 based on the drain-source voltage is selected to design a three-output flyback switching power supply prototype. In order to adjust each output of the prototype, the method of weighted voltage feedback control is introduced in this study. The comparison between the proposed prototype and the diode rectifier prototype show that the full load efficiency of the former is 7.6% higher than that of the latter. Experimental results indicate that the synchronous rectification technology effectively improves the output voltage accuracy of the prototype and improves the multi-output cross-regulation characteristics.

Key words: multiple-output, flyback, switching power supply, synchronous rectification, UCC24610, low-voltage high-current, cross-regulation, cross-regulation rate

CLC Number:

TN86

CHEN Zhuo,WANG Jingmei,LIU Yu. Research on Synchronous Rectification Technology of Multi-Output Flyback Switching Power Supply[J].Electronic Science and Technology, 2022, 35(10): 15-20.

Figures/Tables 10

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References 18

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MOSFET	型号	V_DS/V	I_D/A	R_DS/mΩ
主开关管	BSC070N10NS3	100	90	7.0
SR管(12 V路)	BSC093N15NS5	150	87	9.3
SR管(5 V路)	BSC072N08NS5	80	74	7.2
SR管(3.3 V路)	BSC057N08NS3	80	100	5.7

样机规格	输入电流/A	输出电压/V
样机规格	输入电流/A	3.3 V路	5 V路	12 V路
同步整流	2.02	3.223	4.84	11.92
二极管整流	2.37	3.099	4.94	13.40

样机规格	交叉调整率
样机规格	3.3 V路	5 V路	12 V路	总计
同步整流样机	1.21%	3.00%	5.10%	9.30%
二极管整流样机	1.52%	5.40%	6.80%	13.70%

Research on Synchronous Rectification Technology of Multi-Output Flyback Switching Power Supply

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