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:
Sep. 16, 2008
Filed:
Aug. 08, 2006
Yoshiaki Hachiya, Shiga, JP;
Yoshiaki Hachiya, Shiga, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An output voltage detection circuit is provided for accurately detecting a secondary side output voltage based on a voltage induced to an auxiliary winding in an isolated switching power supply including a transformer having the auxiliary winding. A voltage waveform processing circuit (-) processes the waveform of the voltage induced to the auxiliary winding (-), a hold circuit (-) holds the voltage peak value after the processing, a secondary side current detection circuit () detects a period during which current passes through a secondary side winding (-), a correction circuit () performs correction to decrease the peak voltage which has been held by the hold circuit (-) during the period, and the corrected voltage is fed back to a control circuit (). Meanwhile, a reset circuit () resets, for a fixed period after the current passes through the secondary side winding (-), the peak voltage having been held by the hold circuit (-).