Title:
低減された消費電力及びトランジスタ定格電圧を有する直列カスケード接続フィルタを備えたアクティブコモンモードEMIフィルタ
Document Type and Number:
Japanese Patent JP4122331
Kind Code:
B2
Abstract:
An active EMI filter for reducing common mode noise current in a circuit, comprising: at least one transistor stage, each having two transistors, a current sensor coupled to the circuit and an output driving the transistor stage, a capacitor coupling the transistor stage and the ground return line, providing a cancellation current to cancel the common mode current in the ground return line. In a feed forward arrangement the transistor stage is coupled between the rectifier and the current sensor, which provide an amplitude gain of approximately unity. The transistor stage may have a local power source and a drive transistor.
Inventors:
Brian Perry
Application Number:
JP2004507130A
Publication Date:
July 23, 2008
Filing Date:
May 22, 2003
Export Citation:
Assignee:
International Rectifier Corporation
International Classes:
H03H11/04; H02M1/12; H02M1/14; H02M1/15; H02M1/44; H02M7/12
Domestic Patent References:
| JP2002010650A | ||||
| JP4025484U | ||||
| JP2004520798A | ||||
| JP2005515661A |
Foreign References:
| US5831842 | ||||
| US5757628 |
Attorney, Agent or Firm:
Masatake Shiga
Takashi Watanabe
Yasuhiko Murayama
Shinya Mitsuhiro
Takashi Watanabe
Yasuhiko Murayama
Shinya Mitsuhiro