Converter controller

Abstract

To provide a converter controller with a power supply regeneration function, which does not require a current detector for detecting DC current, achieves a high voltage control response and a low switching frequency, suppresses a cost increase and switching loss and can stably control DC voltage during power supply regeneration without fluctuation.SOLUTION: A converter controller with a power supply function 1 includes: a converter circuit 2 which converts AC power from a three-phase AC power supply 100 into DC power, converts DC power into AC power and is configured of a switching semiconductor of an upper phase and a switching semiconductor of a lower phase; and a converter control unit 10 for controlling switching of the converter circuit 2. The converter control unit 10 includes: a current controller 41 for generating a conduction command from a difference between a current command and DC current of the converter circuit 2; a phase detector 31 for detecting a 120° section in which voltage of each phase of the three-phase AC power supply becomes the maximum; and a gate controller 42.SELECTED DRAWING: Figure 1

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