Lightweight electromagnetic interference filter

Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters

Reexamination Certificate

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Details

C333S172000, C333S177000

Reexamination Certificate

active

07994876

ABSTRACT:
A low pass filter includes a differential mode filter and a common mode filter. The common mode portion of the filter includes at least one inductor and one capacitor, as well as a damping circuit with at least one capacitor. The low pass filter has a reduced weight, which is useful in circumstances in which weight is a significant factor, such as in aircraft.

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patent: WO2009013996 (2009-01-01), None
West, “Common Mode Inductors for EMI Filters Require Careful Attention to Core Material Selection”, PCIM Magazine, Jul. 1995.
Mohan, et al., “A Novel Topology of EMI Filter to Suppress Common Mode and Differential Mode Noises of Electro Magnetic Interference in Switching Power Supplies”, ARPN Journal of Engineering and Applied Sciences, Aug. 2007, pp. 32-35, vol. 2, No. 4.
Choochuan C, “A survey of output filter topologies to minimize the impact of PWM inverter waveforms on three-phase AC induction motors,” 7th International Power Engineering Conference (IPEC), Nov. 29-Dec. 2, 2005, pp. 1-544, XPO31386048, figures 12,20,21.
Waeckerle T et al., “Strong volume reduction of common mode choke for RFI filters with help of nanocrystalline cores design and experiments,” Journal of Magnetism and Magnetic Materials, vol. 304, No. 2, Sep. 2006, pp. e847-e849, XP024984886, abstract.
European Search Report in counterpart foreign application No. EP 09251858.8 filed Jul. 23, 2009.

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