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

摘要/Abstract

摘要：

在反激式开关电源中,传统二极管整流方式整流损耗大、效率低,多路输出交叉调节特性差。针对该问题,文中采用同步整流技术对多输出反激式开关电源进行了研究。对反激变换器同步整流技术及其驱动方式进行分析,选用基于漏源电压的同步整流控制芯片UCC24610设计了一款三输出反激式开关电源样机。为使样机每路输出都得到调节,文中引入了加权电压反馈控制的方法。将文中样机与二极管整流样机进行对比测试后发现,前者比后者的满载效率提高了7.6%。研究结果表明,同步整流技术有效提高了样机输出电压精度,改善了多输出交叉调节特性。

关键词: 多路输出, 反激式, 开关电源, 同步整流, UCC24610, 低压大电流, 交叉调节, 交叉调整率

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

中图分类号:

TN86

陈卓,王京梅,刘宇. 多输出反激式开关电源同步整流技术[J]. 电子科技, 2022, 35(10): 15-20.

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.

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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%