Active common mode canceler
US5831842A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 1997 |
| Grant date | Nov 3, 1998 |
| Priority date | — |
| Expiry date | Aug 5, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/123
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.