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:
Oct. 26, 2010
Filed:
Nov. 08, 2004
Tatsuya Hosotani, Muko, JP;
Hiroshi Takemura, Muko, JP;
Tatsuya Hosotani, Muko, JP;
Hiroshi Takemura, Muko, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A switching power-supply unit uses a time when a transformer voltage Vt inverts due to a rectifier diode (Ds) entering a non-conducting state as a trigger, and a first switching control circuit (CNT) turns on a first switching element (Q) after a predetermined delay time passes. A second switching control circuit (CNT) turns on a second switching element (Q) using a time when the transformer voltage Vt inverts due to turning off of the first switching element (Q) as a trigger. A third switching control circuit (CNT) turns on a third switching element (Q) using turning off of the second switching element (Q) as a trigger. The first switching control circuit (CNT) determines a period tonof the first switching element (Q) such that a first output voltage Vois set to a predetermined value. The second switching control circuit (CNT) determines an ON-period tonof the second switching element (Q) such that a second output voltage Vois set to a predetermined value. The third switching control circuit (CNT) determines an ON-period tonof the third switching element (Q) such that a third output voltage Vois set to a predetermined value.