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. 18, 1990
Filed:
Apr. 05, 1989
Nobuyoshi Nagagata, Kadoma, JP;
Osamu Hiromura, Yawata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A switching power supply comprises first switching circuit for making an input voltage on and off, a transformer having a primary winding connected in series with the first switching circuit, first rectifying and smoothing circuit connected to a secondary winding of the transformer and a second switching circuit for releasing the output of the rectifying and smoothing circuit back to the secondary winding of the transformer during the off-period of the first switching circuit. The switching power supply may further comprise a control circuit for controlling on or off the second switching circuit in response to the output of the first rectifying and smoothing circuit. The power supply may alternatively comprise a second rectifying and smoothing circuit connected to additional secondary winding to control on or off of the first switching circuit. Thus a stabilized switching power supply is provided with lower power loss, higher efficiency and lower noise.