Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1992-05-18
1993-07-13
Voeltz, Emanuel T.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
333174, 333175, 333176, 323208, H02M 112, H03H 700
Patent
active
052279626
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. To maximize the power factor of the circuit comprising the network and consequently the dynamic range of audio equipment coupled thereto, the magnitude of the total capacitance of the network is chosen to be as close as possible to the magnitude of the input inductance of the audio equipment. Switches are provided for selectively adjusting the number of parallel circuits in the network to change its frequency response as well as to accommodate loads having different input inductive reactance at 60 Hz.
REFERENCES:
patent: 2662216 (1953-12-01), Klinkhamer
patent: 4272743 (1981-06-01), Evans
Constant Velocity Transmission Lines, Inc.
Voeltz Emanuel T.
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