Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1986-06-25
1987-09-08
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 97, 363124, 363131, 358190, 315370, 315411, H02M 3335
Patent
active
046928529
ABSTRACT:
In a switching power supply for a video display apparatus, the primary winding of an isolation power transformer is coupled to a chopper switch and to an AC mains rectified output voltage source. A control circuit regulates the conduction of the chopper switch. A B+ voltage for a horizontal deflection circuit is generated from a first secondary winding electrically isolated from the primary winding. An audio supply voltage for a power audio circuit is generated from a second secondary winding also electrically isolated from the primary winding. A first feedback winding, more tightly coupled magnetically to the first secondary winding, and a second feedback winding, more tightly coupled to the second secondary winding, develop respective feedback voltages. The feedback voltages are proportionally summed and applied to the control circuit to vary the conduction of the chopper switch in a manner that regulates the secondary winding voltages and stabilizes raster width with audio loading changes.
REFERENCES:
patent: 3641267 (1972-02-01), Cavallari
patent: 4253137 (1981-02-01), Rao
patent: 4298829 (1981-11-01), Luz
patent: 4335423 (1982-06-01), Koizumi et al.
patent: 4481564 (1984-11-01), Balaban
patent: 4510564 (1985-04-01), Seer, Jr.
patent: 4559481 (1985-12-01), Dietz
patent: 4572993 (1986-02-01), Haferl
RCA Color Television Basic Service Data CTC 133 Series, dated 1985, pp. 1-C1 and 1-C2.
U.S. patent application, Ser. No. 793,421, filed Oct. 31, 1985, entitled Switching Power Supply Regulator For Isolated Chassis, by J. H. Wharton.
Laks Joseph J.
Rasmussen Paul J.
RCA Corporation
Todd Voeltz Emanuel
Whitacre Eugene M.
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