Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1994-03-01
1994-11-08
Voeltz, Emanuel T.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
348730, H02M 3335, H04N 563
Patent
active
053632877
ABSTRACT:
A forward converter for supplying various output voltages for a television receiver includes a multi-resonant circuit, including a resonant inductor, a charging capacitor, and the output capacitors across each secondary winding of an output transformer. This arrangement relaxes the slopes of the voltages in the converter resulting in reduced radiated EMI. In addition, the values of the inductor and the capacitors are adjusted so that a switching transistor in the forward converter turns on at zero voltage and zero current so that the switching transistor is less stressed and the converter is capable of high frequency operation. The secondary providing high voltage includes the series arrangement of two oppositely conducting diode branches, each branch including the series arrangement of a high voltage diode and a Schottky diode. Finally, the switching signals applied to the switching transistor are subjected to a filter-delay to lessen the slope of the signals thereby also resulting in a reduction in the EMI radiated from the driving circuit.
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Caldeira Paulo
Liu Rui
Goodman Edward W.
Nguyen Matthew
Philips Electronics North America Corporation
Voeltz Emanuel T.
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