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:
Mar. 14, 1989
Filed:
May. 20, 1987
International Business Machines Corp., Armonk, NY (US);
Abstract
A non-interfering power supply includes a free-running blocking oscillator power supply subsystem and a circuit arrangement that synchronizes the blocking oscillator power supply subsystem to operate at the horizontal operating frequency of a display subsystem. Synchronizing signals representative of the horizontal operating frequency of the display subsystem are generated and are used to activate the circuit arrangement that causes the blocking oscillator to change its mode of operation from free-running to a fully reset fixed frequency flyback converter. When activated, a switch in the circuit arrangement extends the off-time of a switching transistor in the blocking oscillator power supply control circuit. As a result, the oscillator is forced to run at an operating frequency lower than its free-running frequency.