A-C power line filter

Details A-C power line filter A-C power line filter

1991-03-06

1993-11-09

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

333174, 333175, 333176, H02M 112, H03H 700

Patent

active

052608620

ABSTRACT:
A filter network adapted to be placed in parallel with a power supply which provides a high impedance to the 60 Hz utility frequency but acts like a short circuit to all higher frequencies. The network comprises a plurality of parallel circuits, each of which comprise a capacitor, an inductor and a resistor in series with a second resistor coupled in parallel with the inductor. Signal levels above 60 Hz in a prototype circuit using seven such parallel circuits with a parallel capacitor coupled thereto shows that above 60 Hz the signal from the power supply is attenuated by 25-30 dB at 1 KHz and that the impedance is substantially resistive beyond 1 KHz.

REFERENCES:
patent: 2662216 (1953-12-01), Klinkhamer
patent: 4272743 (1981-06-01), Evans

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