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1. (WO2018135159) THREE-LEVEL INVERTER

Pub. No.:    WO/2018/135159    International Application No.:    PCT/JP2017/043527
Publication Date: Fri Jul 27 01:59:59 CEST 2018 International Filing Date: Tue Dec 05 00:59:59 CET 2017
IPC: H02M 7/487
Applicants: FUJI ELECTRIC CO., LTD.
富士電機株式会社
Inventors: CHIN, Sousei
陳 ▲爽▼清
Title: THREE-LEVEL INVERTER
Abstract:
The present invention facilitates further reduction of losses in a three-level inverter in which a unipolar diode is used as a reflux diode. This three-level inverter is provided with: a first semiconductor switching element disposed between a direct-current high potential terminal and an alternating-current output terminal; a second semiconductor switching element disposed between a direct-current low potential terminal, which is paired with the direct-current high potential terminal, and the alternating-current output terminal; first and second reflux diodes that are disposed reverse-parallelly with the first and second semiconductor switching elements, respectively; and a semiconductor circuit which controls gate voltages of the first and second semiconductor switching elements by selectively applying thereto a direct-current intermediate voltage which is given to a direct-current intermediate potential terminal. In particular, inductance elements are connected in series to the first and second reflux diodes so as to increase the circuit impedances through the first and second reflux diodes.