This paper proposes an "Active Common-noise Canceler (ACC)" that is capable of eliiminating the commonmode voltage produced by a PWM inverter. An emitter follower using complementary transistors and a commonmode transformer are incorporated into the ACC, the design method of which is also presented in detail. A prototype ACC designed and constructed in t h i s paper verifies the viability and effectiveness in a 3.7 k W induction motor drive using an IGBT inverter. Some experimental results show that the ACC makes significant contributions to reducing a ground current and a conducted ECMI. In addition, the ACC can prevent an electric shock on a non-grounded motor frame and can suppress a motor shaft voltage.
This paper proposes an "active common-mode noise canceler" that is capable of eliminating the common-mode voltage produced by a voltage-source PWM inverter. It generates a compensating voltage which has the same amplitude as, but the opposite phase to, the common-mode voltage produced by the PWM inverter. The compensating voltage is superimposed on the inverter output by a common-mode transformer.As a result, the common-mode voltage applied to the load is canceled completely. The design method of the active common-mode noise canceler is also presented in detail.A prototype has been constructed and tested to verify the effectiveness for an induction motor drive system of 3.7 kW using an IGBT inverter. Some experimental results show that the proposed active common-mode noise canceler makes a significant contribution to eliminating the common-mode current or the ground current, and it prevents an electric shock from being received by anyone who is touching.
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