CONTROL SYSTEM AND METHOD FOR ACTIVE CLAMP FLYBACK CONVERTER

WIPO Patent Application WO/2020/253826

A1

A control system and method for an active clamp flyback converter. The system comprises: a drive module (40) for performing on-off control on a main switch tube SL and a clamp switch tube SL; a main switch tube voltage sampling circuit (10) for sampling a voltage drop between an input end and an output end of the main switch tube SL; a first comparator (20) connected to the main switch tube voltage sampling circuit (10) and used for determining whether a sampled first sampling voltage is a positive voltage or a negative voltage; and a dead time calculation module (30) for adjusting, according to an output of the first comparator (20) and a main switch tube control signal DUTYL of a current cycle, a clamp switch tube control signal DUTYH of the next cycle output by the drive module (40).

XU SHEN (CN)
CHEN MINGGANG (CN)
YANG WANQING (CN)
WANG DEJIN (CN)
JIANG RUI (CN)
SUN WEIFENG (CN)
SHI LONGXING (CN)

PCT/CN2020/097118

December 24, 2020

June 19, 2020

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UNIV SOUTHEAST (CN)
CSMC TECHNOLOGIES FAB2 CO LTD (CN)

H02M3/335

CN108736729A	2018-11-02
CN109245569A	2019-01-18
CN107896062A	2018-04-10
US20180287481A1	2018-10-04
JP3022620B2	2000-03-21

SEBASTIEN LAROUSSE; HUBERT RAZIK; REMY CELLIER; NACER ABOUCHI; PHILIPPE VOLAY: "Active Dead-time optimization for wide range Flyback active-clamp converter", PCIM EUROPE 2016; INTERNATIONAL EXHIBITION AND CONFERENCE FOR POWER ELECTRONICS, INTELLIGENT MOTION, RENEWABLE ENERGY AND ENERGY MANAGEMENT, 12 May 2016 (2016-05-12), pages 1707 - 1712, XP055766562

ADVANCE CHINA IP LAW OFFICE (CN)

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