Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2005-01-11
2005-01-11
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C363S037000, C363S039000
Reexamination Certificate
active
06842069
ABSTRACT:
An active EMI filter for reducing common mode noise current in a circuits, comprising: a transistor stage having two transistors coupled in series, a current sensor for sensing the common mode noise current, the current sensor having an output driving the transistor stage, whereby each of the transistors is driven in response to the common mode noise current, a capacitor coupling the transistor stage and the ground return line, the capacitor providing a cancellation current to cancel the common mode noise current, the current sensor comprising a current transformer having a primary coupled with the circuit having the common mode noise. The current sensor and the transistor stage may be coupled in a feed forward arrangement wherein the transistor stage and the current sensor have an amplitude gain of approximately unity; or in a feedback arrangement wherein the transistor stage and current sensor provide high gain.
REFERENCES:
patent: 4730243 (1988-03-01), Glennon
patent: 5012058 (1991-04-01), Smith
patent: 5757628 (1998-05-01), Kamata
patent: 5831842 (1998-11-01), Ogasawara et al.
patent: 6636107 (2003-10-01), Pelly
PCT International Search Report dated Sep. 16, 2003.
Pelly Brian
Takahashi Toshio
International Rectifier Corporation
Le Dinh T.
Ostrolenk Faber Gerb & Soffen, LLP
LandOfFree
Active common mode EMI filters does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Active common mode EMI filters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active common mode EMI filters will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3382877