CURRENT ESTIMATION CIRCUIT FOR RECTIFIER CIRCUIT, AC-DC CONVERTER, POWER CONTROLLER, CURRENT ESTIMATION CIRCUIT, CURRENT ESTIMATION METHOD AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a rectifier circuit capable of protecting a system by facilitating detection of an abnormal state in a system when a voltage of each of R-phase, S-phase and T-phase of a three-phase AC power supply is under an unbalanced state.SOLUTION: A rectifier circuit includes a phase specification section and a current specification section. The phase specification section specifies each phase of a plurality of AC voltages output from a power supply. The current specification section specifies an electric current corresponding to a voltage after rectifying the plurality of AC voltages at a time interval determined based on each phase specified by the phase specification section.SELECTED DRAWING: Figure 1