Patent · US Expired

Electrical filter for attenuating oscillations in AC mains

US5805032A · kind A · utility

6Cited by

3References

6Claims

0Family size

Assignee

Asea Brown Boveri, S.A. · CH

Inventors

Werner Herbst · Biebertal, DE
Thomas Kirsten · Lauchringen, DE

Key dates

Filing date	Dec 9, 1996
Grant date	Sep 8, 1998
Priority date	—
Expiry date	Dec 9, 2016

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02E40/40
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

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).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.