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:
Dec. 24, 2013
Filed:
Feb. 16, 2011
Junpei Uruno, Tokai, JP;
Hiroyuki Shoji, Hitachi, JP;
Masayuki Isogai, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A power converting apparatus having a gate drive circuit including a push-pull circuit consisting of two transistors at its output stage; a diode connected in series with the push-pull circuit; a gate power source connected in parallel with the series circuit of the push-pull circuit and the diode; a negative voltage generating circuit connected in parallel with the push-pull circuit; a transistor connected between the output terminal of the negative voltage generating circuit and the negative terminal of the gate power source, wherein the output voltage of the push-pull circuit is switched from positive polarity to negative polarity and vice versa depending on the signal applied to the base terminals of the transistors.