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:
Nov. 20, 2001
Filed:
Nov. 27, 2000
Ju Won Baek, Kyungsangnam-do, KR;
Dong Wook Yoo, Kyungsangnam-do, KR;
Korea Electrotechnology Research Institute, Kyungsangnam-do, KR;
Abstract
The present invention relates to a passive auxiliary circuit for driving power switches connected in series for much higher rating of a power system. The passive auxiliary circuit for an IGBT power switch connected in series with another, comprises two capacitors, which are connected in series across the IGBT; two resistors dividing a voltage applied across the IGBT, each resistor being connected in parallel with each capacitor; and a diode and a third resistor which are connected in series between a gate terminal of the IGBT and a node connecting the two capacitors, wherein the diode is placed such that its cathode is directed to the gate. This passive auxiliary circuit, whose structure is so simple, is able to distribute a supplied high voltage equally over series-connected IGBTs, to reduce additional power loss remarkably, and to relieve transient overvoltage like as a conventional active gate circuit.