The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 1998
Filed:
Mar. 06, 1997
Tomoyasu Yamada, Niiza, JP;
Sanken Electric Co., Ltd., Saitama-ken, JP;
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.