Active common mode canceler

Details Active common mode canceler Active common mode canceler

1997-08-05

1998-11-03

Wong, Peter S.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

363 37, 363 41, 363 34, H02M 112, H02M 545, H02J 300

Patent

active

058318429

ABSTRACT:
An active common mode canceler includes a voltage detection circuit including a plurality of capacitors connected to the output terminals of a power converter for performing power conversion by switching a power semiconductor device and serving to detect a common mode voltage generated when the power semiconductor device is switched, a push-pull type emitter follower circuit which is controlled by the common mode voltage detected by the voltage detection voltage to output a voltage equal in magnitude and opposite in polarity to the common mode voltage, and a common mode transformer having multiple windings and serving to cancel out the common mode voltage by superimposing the voltage output from the emitter follower circuit on the output from the power converter.

REFERENCES:
patent: 4679130 (1987-07-01), Moscovici
patent: 4876637 (1989-10-01), Mose et al.
patent: 4937720 (1990-06-01), Kirchberg
patent: 5373223 (1994-12-01), Akagi et al.
patent: 5483140 (1996-01-01), Hess et al.
patent: 5568371 (1996-10-01), Pitel et al.
patent: 5661390 (1997-08-01), Lipo et al.

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