Title :
An active circuit for cancellation of common-mode voltage generated by a PWM inverter
Author :
Ogasawara, Satoshi ; Ayano, Hideki ; Akagi, Hirofumi
Author_Institution :
Dept. of Electr. Eng., Okayama Univ., Japan
fDate :
9/1/1998 12:00:00 AM
Abstract :
This paper proposes an active common-noise canceler (ACC) that is capable of eliminating the common-mode voltage produced by a pulsewidth modulation (PWM) inverter. An emitter follower using complementary transistors and a common-mode transformer are incorporated into the ACC, the design method of which is also presented in detail. Experiments using a prototype ACC, whose design and construction are discussed in this paper, verify its viability and effectiveness in eliminating common-mode voltage in a 3.7 kW induction motor drive using an insulated gate bipolar transistor (IGBT) inverter. Some experimental results show that the ACC makes significant contributions to reducing a ground current and a conducted electromagnetic interference (EMI). In addition, the ACC can prevent an electric shock on a nongrounded motor frame and can suppress motor shaft voltage
Keywords :
PWM invertors; active networks; amplifiers; electromagnetic compatibility; electromagnetic interference; induction motor drives; insulated gate bipolar transistors; interference suppression; 3.7 kW; EMC; IGBT; PWM inverter; active circuit; common-mode transformer; common-mode voltage cancellation; complementary transistors; conducted EMI reduction; conducted electromagnetic interference; electric shock prevention; emitter follower; ground current reduction; induction motor drive; insulated gate bipolar transistor; motor shaft voltage suppression; nongrounded motor frame; pulsewidth modulation inverter; Active circuits; Design methodology; Electromagnetic interference; Insulated gate bipolar transistors; Power transformer insulation; Prototypes; Pulse inverters; Pulse transformers; Pulse width modulation inverters; Voltage;
Journal_Title :
Power Electronics, IEEE Transactions on
