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1. (WO2012124510) CHARGING METHOD FOR SNUBBER CAPACITOR

Pub. No.:    WO/2012/124510    International Application No.:    PCT/JP2012/055363
Publication Date: Fri Sep 21 01:59:59 CEST 2012 International Filing Date: Sat Mar 03 00:59:59 CET 2012
IPC: H02M 7/12
H02M 5/45
Applicants: NABTESCO CORPORATION
ナブテスコ株式会社
KOBAYASHI, Yasunaga
小林 康永
YAMAMOTO, Kosai
山本 耕才
Inventors: KOBAYASHI, Yasunaga
小林 康永
YAMAMOTO, Kosai
山本 耕才
Title: CHARGING METHOD FOR SNUBBER CAPACITOR
Abstract:
[Solution] A potential difference between both ends of a snubber capacitor (30) connected between intermediate direct current bus lines (4p, 4n) of an indirect matrix converter (1) is detected at the moment of input of a three-phase alternating current source. On the basis of these detection results, of the phases of the three-phase alternating current source, two phases with a potential difference that is almost the same as the potential difference of the snubber capacitor (30) are determined. Of these two phases, the phase with a rising voltage is connected via the indirect matrix converter (1) to a positive electrode of the snubber capacitor (30), and the phase with a falling voltage is connected via the indirect matrix converter (1) to a negative electrode of the snubber capacitor (30).