Research on a High-Efficiency Winding Self-Driven Synchronous Rectification Flyback DC/DC Converter

doi:10.16628/j.cnki.2095-8188.2022.08.003

Abstract

Abstract:

Synchronous rectification technology is widely used in switching power supply.The rectification based on MOSFET with small R_ds(on) instead of schottky diodes can improved conversion efficiency.In order to solve the problem of complex shutdown control circuit for the self driving synchronous rectification,a winding self-driven synchronous rectification flyback DC/DC converter is studied.The influence of leakage inductance on the working state of synchronous rectification MOSFET is analysed.The optimal design of transformer leakage inductance is obtained by the transformer and circuit simulation.A 5 V/20 W output winding self-driven synchronous rectification flyback DC/DC converter with efficiency up to 89.7%is designed.It is suitable for the small volume synchronous rectification DC/DC converter to improve the power density.

Key words: winding self-driven, synchronous rectification, DC/DC converter, leakage inductance

CLC Number:

TM46

CHENG Ming, HUANG Ji, CHEN Lichuan. Research on a High-Efficiency Winding Self-Driven Synchronous Rectification Flyback DC/DC Converter[J]. LOW VOLTAGE APPARATUS, 2022, 0(8): 18-22.

项目	全交错	二次侧夹一次侧	一次侧夹二次侧	不交错
第2层	B	B	A1	A1
第3层	A1	A1	B	A2
第4层	B	A2	B	B
第5层	A2	B	B	B
第6层	B	B	A2	B
第7层	C	C	C	C
L_σ/μH	0.006	0.011	0.014	0.027
L_P /μH	16.39	16.28	16.37	16.28
L_S/μH	2.34	2.31	2.35	2.32

漏感L_σ/μH	VT1峰值电流/A	VT2漏感尖峰电压/V
0.006	9.6	12
0.011	4.3	18
0.014	3.1	19
0.027	3.0	23

名称	型号	参数
一次侧功率管 VT2	SI7738 VISHAY	150 V/30 A/38 mΩ
同步整流管 VT1	BSC190N15N INFINION	150 V/50 A/19 mΩ

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Research on a High-Efficiency Winding Self-Driven Synchronous Rectification Flyback DC/DC Converter

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