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:
May. 01, 2001
Filed:
Apr. 14, 2000
Katsutoshi Yamanaka, Fukuoka, JP;
Kenji Yamada, Fukuoka, JP;
Akira Kumagae, Fukuoka, JP;
Takaaki Terada, Fukuoka, JP;
Kabushiki Kaisha Yaskawa Denki, Kitakyushu, JP;
Abstract
In a three-level neutral point clamping type inverter circuit which includes a positive bus line (,), a negative bus line (,) and a neutral line (,), wherein first and second IGBTs (,), (,) are connected in series between the positive bus line (,) and a phase voltage output terminal (,) and third and fourth IGBTs (,), (,) are connected in series between the negative bus line (,) and the phase voltage output terminal (,), the three-level neutral point clamping type inverter circuit further includes a first snubber capacitor (,) provided between the positive bus line (,) and the neutral line (,), a second snubber capacitor (,) provided between the negative bus line (,) and the neutral line (,), a first snubber diode (,) having a cathode coupled to the positive bus line (,) and an anode coupled to the phase voltage output terminal (,), and a second snubber diode (,) having an anode coupled to the negative bus line (,) and a cathode coupled to the phase voltage output terminal (,).