Patent ID: 8080958
Filing Date: 2011-12-20
Classification: H02M

Abstract:
1. A power conversion device that receives a three-phase AC power supply as an input and controls an output voltage in accordance with a voltage command by PWM control so as to supply power to a load including a motor, the power conversion device comprising: a main circuit section including: a four-step commutation device generating a plurality of steps on a basis of a polarity of the load current, the plurality of steps including: wherein the four-step commutation device performs commutation in a sequence of the step 1, the step 2, the step 3, and the step 4, wherein times between each of the plurality of steps during a half PWM cycle for commutation from a high potential power supply phase to a low potential power supply phase are set to Td wherein times between each of the plurality of steps during a half PWM cycle for commutation from the low potential power supply phase to the high potential power supply phase are set to Td and wherein at least of one of Td