Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1998-08-07
1999-11-09
Han, Y. J.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
315411, 363 97, H02M 3335, H01J 2970
Patent
active
059826410
ABSTRACT:
A high-voltage power supply of a video display apparatus provides an ultor voltage and a focus voltage to a cathode ray tube. A low-voltage power supply provides a variable voltage to a primary winding of a flyback transformer of the high-voltage power supply. The magnitude of the variable voltage is responsive to first and second feedback signals provided by first and second negative feedback paths. The first feedback signal is derived from the ultor voltage and is used to regulate the ultor voltage. The second feedback signal is provided by the low-voltage power supply via a path that bypasses the high-voltage power supply, and is summed with the first feedback signal to ensure that the focus voltage remains at or above a predetermined minimum voltage.
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Han Y. J.
Henig Sammy S.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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