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	A COMBINED BUCK AND BOOST POWER-FACTOR-CONTROLLER FOR THREE-PHASE INPUT	[View]   [Download]
Author(s)	Berthold Fuld; Siegfried Kern; Ray Ridley
Abstract	Power factor controllers presented in the past are mostly either boost-type (with high output voltage) or buck-type (with low output voltage) [1]. An alternate solution is a combination of a buck and a boost stage, giving important advantages at high input voltage - Favourable output voltage, e.g. 400 V - Wide input voltage range - No additional inrush limiter necessary For three-phase input, it is possible to use three single phase units connected each to two phases (line-to-line). Since the busses have different voltages to ground, it is not possible to connect them. Therefore it is necessary to use DC/DC converters with loadsharing to get equal input currents. The control is simple: a conventional PFC-controller is augmented by an additional current loop and a circuit which switches between the two stages.
Download	Filename: Unnamed file Filesize: 2.318 MB
Type	Members Only
Date	Last modified 2019-05-23 by System