Electrical filter for attenuating oscillations in AC mains

Details Electrical filter for attenuating oscillations in AC mains Electrical filter for attenuating oscillations in AC mains

1996-12-09

1998-09-08

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333176, 307105, 363 47, H03H 706

Patent

active

058050329

ABSTRACT:
In order to avoid filter excitations of subharmonics or intermediate harmonics, that is to say of oscillations in the frequency range between integral harmonics of the mains frequency (f.sub.N), in the case of an attenuation resistor (R1, R3, R3') in parallel with a series resonant circuit comprising a filter inductor (L1, L3) in series with a filter capacitor (C1, C31, C31'), the resistance is dimensioned in such a way that a current gain of the filter (F1-F3) at its frequency pole points with an AC mains (1) is not greater than 6-fold. Double low-pass filters (F1, F2) and high-pass filters (F3) with attenuation resistors (R1, R3, R3') are particularly suitable as filters (F1, F3).

REFERENCES:
patent: 3881137 (1975-04-01), Thanawala
patent: 5260862 (1993-11-01), Marsh
patent: 5619080 (1997-04-01), Pennington et al.
"Robuste Filter in der Energieversorgung", Forsyth, et al., etz. Bd. 114 (1993), pp. 1382-1385.

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