Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1999-03-05
2000-05-16
Tso, Edward H.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363127, 363 89, H02M 3335, H02M 704, H02M 7217
Patent
active
060645806
ABSTRACT:
A switching power supply has first and second switching elements that are alternately turned on to cause an alternating current to flow through a primary winding of a transformer. The alternating current flowing through the primary winding induces voltages respectively across first and second secondary windings of the transformer. Synchronous rectifying transistors are turned on by the voltages induced across the first and second secondary windings, causing a current to flow alternately through the first and second secondary windings. Either one of the first and second switching elements is turned on while the other is being turned off, except for short off-times in which both the first and second switching elements are prevented from being turned on. As a result, when currents flow through the first and second secondary windings, the synchronous rectifying transistors are turned on. Therefore, no current flows through internal parasitic diodes of the synchronous rectifying transistors, and hence any loss caused thereby is very small.
REFERENCES:
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patent: 5243509 (1993-09-01), Laeuffer
patent: 5822198 (1998-10-01), Fraidlin et al.
patent: 5907481 (1999-05-01), Svardsjo
J.A. Cobos, et al.; "Optimized Synchronous Rectification Stage for Low Output voltage (3.3V) DC/DC Conversion"; IEEE Power Electronics Specialists Conference (PESC) (1994); p902-p908, May 1994.
Ionel Dan Jitaru et al.; "Increasing the Utilization of the Transformer's Magnetic Core by Using Quasi-integrated Magnetics"; HFPC Power Conversion (Sep. 1996); p238-p908.
Eiji Sakai et al.; "synchronous Rectifier for Low Voltage Switching Converter"; Technical Report of IEICE; PE95-14 (1995-07); p9-p16.(with translation of relevant passages).
Hatakeyama Haruhiko
Watanabe Haruo
Patel Rajnikant B.
Shindengen Electric Manufacturing Co. Ltd.
Tso Edward H.
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