Electric power conversion systems – Current conversion – Using semiconductor-type converter
Patent
1997-05-28
1999-02-09
Berhane, Adolf
Electric power conversion systems
Current conversion
Using semiconductor-type converter
363 21, 363 45, H02M 7217
Patent
active
058702997
ABSTRACT:
Apparatus and method for eliminating cross conduction of self-driven synchronous rectifiers in power converters caused by non-idealized ringing of parasitic capacitances and inductors. In an exemplary embodiment, the apparatus includes synchronous rectifiers or some hybrid topology having at least one synchronous rectifier coupled to a damping circuit having at least one switching device. The switching device is activated (ON) at a time when at least one of the synchronous rectifiers is supposed to remain inactive (OFF). Accordingly, when the switching device is ON, the device effectively dampens any ringing present at the synchronous rectifier that may cause the rectifier to inappropriately transition ON. The damping circuit of the present invention utilizes the same signals present to control the synchronous rectifier(s) and requires no additional control circuitry. Additionally, the damping circuit dramatically improves the efficiency of self synchronous power converters and is topology independent.
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Berhane Adolf
Lucent Technologies - Inc.
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