Patent
Power factor correction circuit
TLDR
In this paper, a power factor correction circuit for an off-line supply of the switch mode type is described, where the inductor causes the amplitude of the unidirectional current to increase and decrease at a rate which is less than it would be if the inductors were not so connected.Abstract:
A power factor correction circuit for an off line supply of the switch mode type. In its simplest form the circuit is made up of a capacitor and an inductor. The capacitor is to be connected to the input rectifier of the supply. The capacitor is in aiding relationship for each half cycle of the line voltage. When so connected, a unidirectional current flows from the rectifier to charge the bank capacitors of the supply. The inductor is to be connected to at least the rectifier. The inductor causes the amplitude of the unidirectional current to increase and decrease at a rate which is less than it would be if the inductor was not so connected. Embodiments having at least two capacitors which are controlled to be switched in and out of the correction circuit as well as one or more inductors which may or may not be controlled are also disclosed.read more
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References
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Patent
Unity power factor switching regulator
TL;DR: In this paper, a single or multiphase boost chopper regulator operating with unity power factor (UPMF) for use such as to charge a battery is presented. But, the duty cycles of the switching converters are evenly spaced and by negative coupling between pairs 180° out-of-phase, peak currents through the switches can be reduced while reducing the inductor size and mass.
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