Switching power supply for computer-driven displays or the like

Details Switching power supply for computer-driven displays or the like Switching power supply for computer-driven displays or the like

1997-03-06

1998-08-11

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 95, 363132, 315411, H02M 3335, H01J 2970

Patent

active

057936218

ABSTRACT:
A power supply system has a switching element to be turned on and off for d.c. to d.c. conversion of a unidirectional supply voltage in synchronism with horizontal synchronizing pulses used for line by line synchronization in a computer display. Since commercial computer systems commonly make selective use of horizontal synchronizing pulses at two different repetition rates, one of which is too high for driving the switching element, the horizontal synchronizing pulses generated at either rate are directed into an amplitude modulator circuit where the pulses are modulated to have either of two different predetermined amplitudes according to their repetition rates. The repetition rate of the horizontal synchronizing pulses being generated is determined from the amplitude of the amplitude modulated horizontal synchronizing pulses, and the switching element is driven at the lower rate even if the horizontal synchronizing pulses are being generated at the higher rate.

REFERENCES:
patent: 4034281 (1977-07-01), Morita et al.
patent: 4646217 (1987-02-01), Baroni et al.
patent: 4954758 (1990-09-01), Rusk
patent: 5481450 (1996-01-01), Lee et al.
patent: 5619403 (1997-04-01), Ishikawa et al.

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