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. 30, 1994
Filed:
Dec. 07, 1990
Applicant:
Inventor:
Tadashi Miyasaka, Matumoto, JP;
Assignee:
Fuji Electric Co., Ltd., Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03K / ; H03K / ;
U.S. Cl.
CPC ...
307570 ; 307253 ; 307520 ; 307542 ;
Abstract
A snubber circuit, for absorbing voltage spikes applied to a power semiconductor device used as a switching means, utilizes the junction capacitance of a directly connected semiconductor device, thereby avoiding the need for a separate high-voltage capacitor. Embodiments shown use either a MOSFET or a bipolar transistor with a resistor connected in parallel between the gate (base) and the source (emitter) of the MOSFET (or bipolar transistor.) The snubber circuit of the present invention may also be a module integrally formed on a radiating base of the power semiconductor device.