Patent ID: 6459601
Filing Date: 2002-10-01
Classification: H02M

Abstract:
A control circuit of a power converter which includes switching elements switching a plurality of times in one cycle of power that is converted, and which is connected with respective output terminals to a three-phase voltage generator through reactors, said control circuit comprising:a current loop having a respective current sensor connected to each of output terminals of a multi-phase power converter for controlling instantaneous magnitude of a corresponding output current of the phases of the power converter; current instruction generation means for providing current instruction values to said current loop; current deviation vector detection means for calculating a current deviation vector between the current instruction values and corresponding current feedback values from said current sensors; voltage detection means for calculating a voltage vector of the three-phase voltage generator; and pulse width modulation (PWM) pattern selection means for selecting a PWM pattern for the power converter in accordance with the current deviation vector and the voltage vector, wherein said PWM pattern selection means sets an allowable deviation range for the current deviation vector, and selects a switching mode for the power converter from among switching modes limited by values of the current deviation vector and the voltage vector when the current deviation vector deviates from the allowable deviation range, and, thereby, selects and outputs the PWM pattern.