Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1996-05-31
1998-03-31
Hecker, Stuart N.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363127, H02M 3335, H02M 7217
Patent
active
057345635
ABSTRACT:
A synchronous rectification type converter includes a main transformer having a primary winding to which an unrectified input voltage is applied and a main switch connected in series with the primary winding of the main transformer. A series-coupled capacitor and clamp switch are connected across the primary winding of the main transformer, where the clamp switch is biased substantially opposite to the main switch such that the reset voltage at the primary winding of the main transformer is clamped. First and second series-coupled synchronous rectifiers which are operated in synchronism with the operation of the main switch are connected across a secondary winding of the main transformer. A first impedance circuit is arranged between a first auxiliary winding of the main transformer and a control terminal of the first synchronous rectifier and a second impedance circuit is arranged between a second auxiliary winding of the main transformer and a control terminal of the second synchronous rectifier such that synchronous rectification is achieved in accordance with an active clamp scheme.
REFERENCES:
patent: 5303138 (1994-04-01), Rozman
patent: 5528482 (1996-06-01), Rozman
patent: 5590032 (1996-12-01), Bowman et al.
Hecker Stuart N.
NEC Corporation
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