Method and network for enhancing power factor of off-line switch

Details Method and network for enhancing power factor of off-line switch Method and network for enhancing power factor of off-line switch

1989-04-07

1990-05-29

Beha, Jr., William H.

Electric power conversion systems

Current conversion

With means to introduce or eliminate frequency components

323208, 363 48, 363126, H02M 112

Patent

active

049300610

ABSTRACT:
An arrangement for improving the power factor at the input of an off-line switching type power supply is operative to extend the duration of the pulse current conducted by the diode rectifiers. A parallel LC ringing circuit is introduced between the AC line and the rectifier of the switching type power supply to enhance the voltage enabling conduction of the rectifying diodes and hence initiate current flow through the rectifying diodes earlier in each half cycle. This extends the conduction interval of the rectifying diodes significantly and enhances the power factor at the input to the switching type power supply.

REFERENCES:
patent: 4222096 (1980-09-01), Capewell
patent: 4369490 (1983-01-01), Blum
patent: 4672522 (1987-06-01), Lesea
"How to Reduce Switching-Supply Input-Line Harmonics", Randall, R., copyright 1981 by CMP Publications Inc., Reprinted with permission from Electronic Engineering Times.

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