Power factor correction circuit

Details Power factor correction circuit Power factor correction circuit

1994-02-14

1997-03-25

Nguyen, Matthew V.

Electricity: power supply or regulation systems

For reactive power control

Using converter

323300, G05F 170

Patent

active

056148100

ABSTRACT:
A compensation circuit in a boost-type preregulator of the type having a power factor control circuit operating in a critical conduction mode by providing a triangular modulation of current according to a sine wave envelope, the compensation circuit in the form of a charge pump circuit acting as a frequency-to-voltage converter and including a capacitor, diode and resistor network providing AC coupled current pulses from the output to the input of the power factor control circuit to reduce crossover distortion during the zero-crossing of input current drawn from a sine wave power source. A capacitor at the current envelope input of the power factor control circuit operates to time-average integrate the current pulses to provide a load-current-dependent bias or compensation signal to the power factor correction circuit regulating the critical conduction mode of operation. In another embodiment, the compensation circuit includes an amplifier connected to a current feedback resistor and to a fixed reference to provide the compensation signal.

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Siemens--Application Note TDA 4814, Mar. 1986, pp. 103-107, Michael Herfurth.

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