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:
Jul. 05, 2016
Filed:
Jan. 21, 2014
Murata Manufacturing Co., Ltd., Nagaokakyo-shi, Kyoto-fu, JP;
Takayoshi Nishiyama, Nagaokakyo, JP;
MURATA MANUFACTURING CO., LTD., Kyoto, JP;
Abstract
A snubber circuit of a switching power supply device includes a transistor and a capacitor which are connected in series between a cathode and an anode of a diode, and a secondary winding of a transformer. A vibration voltage is generated in the secondary winding when a surge voltage is generated in the diode. The snubber circuit further includes a differentiating circuit which differentiates a voltage between terminals of the secondary winding, and a peak charging circuit which generates a control voltage of a waveform connecting a plurality of peaks of an output voltage of the differentiating circuit and applies the control voltage to a gate of the transistor to cause the transistor conduct.