Patent ID: 6154090
Filing Date: 2000-11-28
Classification: H02M,Y02B

Abstract:
A method of reducing feedback action on a timely flow of an input current, drawn by a load from a network via a rectifier and a plurality of boost converters, by active filtering of upper harmonics of the input current using power factor corrector circuits, wherein each power factor corrector circuit includes a switch and a pulse-width modulator, the method comprising the steps of:dividing a current path, of the input current, between the rectifier and the load into a plurality of parallel channels;providing in each channel a boost converter including a booster-choke and a booster-diode;providing the switch of a power factor corrector circuit in a shunt arm connecting a junction point between the booster-choke and the booster-diode of the boost converter with a reference potential; andproviding a pulse-width modulation circuit connected to the switches for controlling the switches such that switch signals of respective switches have substantially the same pulse-width modulation and are phase-shifted relative to each other to produce a reduced residual ripple of the input current responsive to the load and output of the rectifier and the boost converter.