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A new active common-mode EMI filter for PWM inverter

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2 Author(s)
Son, Y.-C. ; Syst. Group, Fairchild Semicond., Gyeonggi-Do, South Korea ; Seung-Ki Sul

This paper presents a new active common-mode electromagnetic interference (EMI) filter for the pulse-width modulation (PWM) inverter application. The proposed filter is based on the current sensing and compensation circuit and it utilizes a fast transistor amplifier for the current compensation. The amplifier utilizes an isolated low-voltage DC power supply for its biasing and it is possible to construct the active filter independent of the source voltage of the equipment. Thus the proposed active filter can be used in any application regardless of its working voltage. The effectiveness of the proposed circuit has been verified by experimental results.

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Power Electronics, IEEE Transactions on  (Volume:18 ,  Issue: 6 )