Fourth order damped lowpass filter for obtaining high power fact

Details Fourth order damped lowpass filter for obtaining high power fact Fourth order damped lowpass filter for obtaining high power fact

1992-01-29

1992-09-15

Voeltz, Emanuel T.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

323205, 323208, 333175, H02M 112

Patent

active

051483602

ABSTRACT:
An arrangement includes a network for connection between an AC power supply and the input of a DC power supply containing rectifiers and a filter capacitor. The network forms a fourth order, damped lowpass filter that waveshapes the AC input current so as to either reduce or remove the magnitude of harmonics which primarily cause distortion of the input current waveform. In one embodiment, the waveshaping network includes a tapped inductor connected in series with the input of the DC power supply. A series combination of a damping resistor and a first capacitor is connected in parallel with the series inductor. One end of a second capacitor is connected to the tap of the inductor. The waveshaping network increases the power factor and lowers the total harmonic distortion the input of the DC power supply presents to the AC power supply.

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Powertechnics Magazine, Feb. 1991, pp. 20-24, Wilkenson, Bruce, "Power Factor Correction and IEC 555-2".
Compliance Engineering, Fall 1991, pp. 33-39, Martin, Robert, "Harmonic Distortion and IEC 555-2".

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