Patent ID: 7560897
Filing Date: 2009-07-14
Classification: H02M

Abstract:
1. A current controller comprising: a current control operating part for performing a current control operation on the basis of a current command to create a voltage command, a modulated wave command creating part for creating a modulated wave command on the basis of the voltage command, a carrier wave generating part for generating a carrier wave, a PWM signal generating part for generating a PWM signal on the basis of comparison between the modulated wave command and the carrier wave, an A/D converter part for A/D converting a current detection value of each phase on the basis of a voltage decrease of a shunt resistor connected in series to a lower arm element of each phase of a three-phase PWM inverter, a carrier wave peak-trough judging part for receiving an input of the carrier wave to output a judging signal of a rise or a fall of the carrier wave, and a current detection value operating part for receiving inputs of the modulated wave command and information of the peak-trough and an A/D converted value to output a current detection correction value.