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
Abstract :
This paper proposes an “active common-noise canceler (ACC)” that is capable of eliminating the common-mode voltage produced by a 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. A prototype ACC designed and constructed in this paper verifies the viability and effectiveness in a 3.7 kW induction motor drive using an IGBT inverter. Some experimental results show that the ACC makes significant contributions to reducing ground current and conducted EMI. In addition, the ACC can prevent electric shock on a ungrounded motor frame and can suppress motor shaft voltage
Keywords :
DC-AC power convertors; PWM invertors; active networks; bipolar transistor switches; electromagnetic compatibility; electromagnetic interference; insulated gate bipolar transistors; power bipolar transistors; power semiconductor switches; power transformers; switching circuits; 3.7 kW; EMC; IGBT inverter; PWM inverter; active circuit; active common-noise canceller; common-mode transformer; common-mode voltage cancellation; complementary transistors; conducted EMI; design method; electric shock prevention; emitter follower; ground current; induction motor drive; motor shaft voltage suppression; Active circuits; Design methodology; Electric shock; Electromagnetic interference; Induction motor drives; Insulated gate bipolar transistors; Prototypes; Pulse width modulation inverters; Shafts; Voltage;
Conference_Titel :
Power Electronics Specialists Conference, 1997. PESC '97 Record., 28th Annual IEEE
Conference_Location :
St. Louis, MO
Print_ISBN :
0-7803-3840-5
DOI :
10.1109/PESC.1997.618067
