Active snubber for buck-based converters and method of operation

Details Active snubber for buck-based converters and method of operation Active snubber for buck-based converters and method of operation

1997-08-27

1999-04-27

Wong, Peter S.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 89, 363132, H02H 7125, H02M 700, H02M 542

Patent

active

058985816

ABSTRACT:
For use with a buck-based converter having an isolation transformer, a snubber circuit and a method of damping a transient in the power rectifying diode due to its reverse recovery. In one embodiment, the snubber circuit includes: (1) a capacitor, coupled to a power rectifying diode in the buck-based converter, that receives energy from the power rectifying diode during a reverse recovery period thereof and (2) a flyback converter, coupled to the capacitor, that receives the energy from the capacitor and delivers the energy to a voltage source on the primary side of the isolation transformer.

REFERENCES:
patent: 4336587 (1982-06-01), Boettcher et al.
patent: 5351179 (1994-09-01), Tsai et al.
Loveday H. Mweene, Chris A. Wright and Martin F. Schlecht, "A 1 kW. 500 kHz Front-End Converter for a Distributed Power Supply System", 1989 IEEE, pp. 423-432.
J.A. Sabate, V.Vlatkovic, R.B. Ridley and F.C. Lee, "High-Voltage, High-Power, ZVS, Full-Bridge PWM Converter Employing an Active Snubber", 1991 IEEE, pp. 158-162.
Guichao Hua, Fred C. Lee and Milan M. Jovanovic, "An Improved Zero-PWM Converter Using a Saturable Inductor", 1991 IEEE, pp. 189-194.
Pending Patent Application Serial No. 08/664,754, filed on Jun. 17, 1996, entitled "Snubber Circuit for Rectifying Diodes and Method of Operation Thereof", by Rui Liu.

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