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:
Dec. 27, 2005
Filed:
Sep. 23, 2004
Satoru Takahashi, Otsu, JP;
Satoru Takahashi, Otsu, JP;
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
It is an object to control the peak of drain current and control overload in a same switching device in a switching power supply which has a load of a transformer and so on, and to prevent a complicated circuit and an increase in the number of terminals of a control circuit. Overload protection is performed as follows: according to a change in a feedback current which is an input to a feedback signal control circuit, the peak value of the current of a switching element, a switching operation is performed intermittently to reduce power consumption when the feedback current decreases at a light load, and an increase in the voltage of an FB terminal is detected and the switching operation is stopped in an overload state where overload protection is performed on the switching element.