Patent ID: 8704482
Filing Date: 2014-04-22
Classification: H02M

Abstract:
1. A power conversion device including a converter for converting AC power to DC power, an inverter for converting the DC power to AC power at a given frequency and at a given voltage for output to an AC motor, and a control unit for controlling the converter and the inverter, the power conversion device comprising: a capacitor connected between the converter and the inverter; and a voltage detector for detecting a capacitor voltage between connection ends of the capacitor, wherein the control unit provides variable control on the capacitor voltage to the converter on the basis of a frequency of the AC motor, the capacitor voltage, and a pulse mode, and fixes a PWM modulation factor to a predetermined value within a range of 0.92 to 0.94 in order to provide operation control to the inverter, the PWM modulation factor being provided at around an inverter frequency which is ⅙ a resonance frequency of an apparatus which incorporates the power conversion device.