Method of power factor correction

Details Method of power factor correction Method of power factor correction

2009-01-15

2011-10-18

Wachsman, Hal (Department: 2857)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Electrical signal parameter measurement system

C702S060000, C702S072000, C702S079000, C700S293000, C700S294000

Reexamination Certificate

active

08041524

ABSTRACT:
A method of power factor correction without using current sensing or a multiplier is disclosed. A generated predictive pulse is used to charge and discharge a power factor correction (PFC) inductor so that the current in the PFC inductor has a similar phase angle as the input AC voltage. Each ON portion of the pulse is used for charging while each OFF portion is used for discharging. As the input voltage increases in phase, the predictive pulse gradually increases in ON time duty and the PFC inductor is charged in increasing amount and discharged in decreasing amount per pulse. When peak is reached the duty ratio is reduced each pulse and the PFC inductor current is reduced along with the input AC voltage source until phase angle reaches 180 degrees and the ON time becomes zero.

REFERENCES:
patent: 4352156 (1982-09-01), Gyugyi
patent: 6232964 (2001-05-01), Lee
patent: 7256569 (2007-08-01), Wu et al.
patent: 7317625 (2008-01-01), Zhang et al.

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