Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1988-11-14
1990-05-29
Salce, Patrick R.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, 363 97, H02M 3335
Patent
active
049300601
ABSTRACT:
An input supply voltage is coupled via a primary winding of a flyback transformer to a collector of a chopper transistor switch that operates at a given frequency. During a portion of each period when the chopper transistor switch is conductive, a second switch applies a short-circuit across a secondary winding of the transformer at a controllable instant that causes the emitter current of the chopper transistor switch to increase at a significantly higher rate. When the emitter current exceeds a predetermined threshold level, a one-shot arrangement is triggered. Consequently, a pulse is produced that turns off the chopper transistor switch and that maintains it nonconductive for the duration of the pulse. A flyback pulse produced in a winding of the transformer is rectified to produce a DC output supply voltage. The length of the interval when the chopper transistor switch is conductive is controlled by the second switch in accordance with the level of the output supply voltage in a negative feedback manner for regulating the output supply voltage.
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Siemens Co., "Switched-Mode Power Supplies Using the TDA 4600", 2/81, pp. 6-15.
A Schematic Diagram of a Power Supply Module AZB 5000 of a Television Receiver Power Supply published by Siemens Co., 7/74.
Henig Sammy S.
Laks Joseph J.
Peckman Kristine
RCA Licensing Corporation
Salce Patrick R.
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