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:
Aug. 09, 2011
Filed:
Jun. 13, 2006
Yoichi Tamegai, Kyoto, JP;
Isao Yamamoto, Kyoto, JP;
Yoichi Tamegai, Kyoto, JP;
Isao Yamamoto, Kyoto, JP;
Rohm Co., Ltd., , JP;
Abstract
A drive circuit controls the on/off state of a switching transistor of a DC/DC converter. A first resistor is provided on a path of current flowing through a primary coil of a transformer connected to the switching transistor, and one end of the first resistor is grounded. A second resistor is provided on a path of current flowing through a secondary coil of the transformer, and one end of the second resistor is grounded. A switching controller turns off the switching transistor when a first detection voltage exceeds a first threshold voltage and, turns on the switching transistor after lapse of predetermined delay time since a second detection voltage exceeds the second threshold voltage.