Balanced low-pass common mode filter

Details Balanced low-pass common mode filter Balanced low-pass common mode filter

1991-08-19

1992-04-28

Laroche, Eugene R.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

333 25, 333167, 333 12, H03H 700

Patent

active

051092069

ABSTRACT:
A balanced L-section low-pass common mode filter is connected in series with balanced data I/O lines to remove common mode signals from balanced line difference mode signals. The filter includes input and output series transformers configured so that the magnetic fields in the transformers are subtractive for out-of-phase difference mode signals and additive for in-phase common mode signals and a shunt transformer coupled to ground configured so that the magnetic fields in the transformer are additive for out-of-phase difference mode signals and subtractive for in-phase common mode signals. Accordingly, the difference mode signals are not attenuated and common mode signals react to a short circuit to ground and are thereby attenuated by the filter.

REFERENCES:
patent: 4409569 (1983-10-01), Potash
patent: 5077543 (1991-12-01), Carlile
A schematic of the Schwartzbeck device, Fernmelde-T-Netznachbildung, VDE 0878, Tell 1 (Walter), NTFM 8132, Feb. 7, 1991.

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