An active circuit for cancellation of common-mode voltage generated by a PWM inverter

• Published in: IEEE transactions on power electronics Vol. 13; no. 5; pp. 835 - 841
• Main Authors: Ogasawara, S., Ayano, H., Akagi, H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.09.1998; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Active circuits; Applied sciences; Connection and protection apparatus; Design methodology; Electric, optical and optoelectronic circuits; Electrical engineering. Electrical power engineering; Electromagnetic interference; Electronics; Exact sciences and technology; Insulated gate bipolar transistors; Power transformer insulation; Prototypes; Pulse inverters; Pulse transformers; Pulse width modulation inverters; Theoretical study. Circuits analysis and design; Voltage; Inverter; Pulse width; Noise; Suppression; Voltage; Transmission; Experimental study; Active circuit; Current; Pulse modulation; Bearing
• ISSN: 0885-8993; 1941-0107
• DOI: 10.1109/63.712285

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.