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:
Apr. 15, 2003
Filed:
Jan. 31, 2001
Akira Konno, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
In a normal operation mode, a mode changeover controller continuously operates a PWM control circuit so as to operate a switching element at the basic oscillation frequency. In a standby mode, the mode changeover controller intermittently operates the PWM control circuit so as to turn on the switching element at a given repetition interval and for a given time period. This repetition interval is shorter than a time for decreasing an output voltage from a rectifying and smoothing circuit down to a guaranteed load operating voltage due to power consumption of the load and the rectifying and smoothing circuit in the standby mode and is longer than a time for entering a sonic frequency band. That time period is longer than a time for stabilizing an output from the rectifying and smoothing circuit and is longer than a time for entering a sonic frequency band.