Switching power supply system for primary and secondary loads wi

Details Switching power supply system for primary and secondary loads wi Switching power supply system for primary and secondary loads wi

1994-04-26

1996-01-02

Nguyen, Matthew V.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 97, 348730, 348734, 307 17, 307 38, H02M 3335, H04N 563, H02J 300

Patent

active

054814502

ABSTRACT:
A power supply system to be built into a television receiver, for powering both the main electric circuitry of the TV set and a remote control receiver circuit. The power supply system comprises a transformer having a primary winding coupled to a direct current power supply via a switching transistor, and secondary windings coupled to the main TV circuitry and to the remote control receiver circuit via rectifying and smoothing circuits. Duration modulated pulses for on-off control of the switching transistor are reduced in recurrence rate when the main TV circuitry is not being powered, so that the remote control receiver circuit is powered with less switching loss than if the switching frequency is left the same as when the main TV circuitry is being powered.

REFERENCES:
patent: 3742242 (1973-06-01), Morio et al.
patent: 4386371 (1983-05-01), George
patent: 4642744 (1987-02-01), Thomas
patent: 4651214 (1987-03-01), Rodriguez-Cavazos
patent: 4968106 (1990-11-01), Ikeuchi et al.
patent: 4975592 (1990-12-01), Hahn et al.
patent: 5349515 (1994-09-01), Megeid
patent: 5351177 (1994-09-01), Megeid
patent: 5402330 (1995-03-01), Megeid

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