Title :
A large capacity GTO inverter with low-loss snubber circuits
Author :
Kawakami, N. ; Jifuku, Y. ; Ueda, S. ; Hombu, M. ; Ueda, A.
Author_Institution :
Hitachi Ltd., Ibaraki-ken, Japan
fDate :
Sept. 28 1991-Oct. 4 1991
Abstract :
A large capacity inverter using high power gate turn-off (GTO) thyristors which can be used instead of a cycloconverter in AC drives is presented. With the techniques of multiple configuration and GTO series connection, the inverter capacity is increased effectively. High conversion efficiency is obtained by using low-loss snubber circuits using energy recovery units (ERUs) have good performance in PWM operation. High energy recovery efficiency is obtained, especially in leading operation (turn-on operation when free-wheeling diode conducts). These snubber circuits have the superior ability for clamping overvoltage at GTO turn-off.<>
Keywords :
invertors; overvoltage protection; thyristor applications; GTO inverter; GTO turn-off; energy recovery units; free-wheeling diode; gate turn-off; low-loss snubber circuits; overvoltage clamping; turn-on operation; Circuits; Induction motors; Power supplies; Power system harmonics; Pulse width modulation inverters; Rectifiers; Snubbers; Switching frequency; Thyristors; Voltage;
Conference_Titel :
Industry Applications Society Annual Meeting, 1991., Conference Record of the 1991 IEEE
Conference_Location :
Dearborn, MI, USA
Print_ISBN :
0-7803-0453-5
DOI :
10.1109/IAS.1991.178343
