POWER CONVERSION DEVICE AND INDUCTION HEATING DEVICE

摘要

Provided is a power conversion device constituted of a converter, a capacitor, and an inverter, wherein a ripple current that flows through the capacitor is suppressed. A current sensor (6) is inserted between the capacitor (5) and an inverter circuit (7), and a current Iinv that flows from the capacitor (5) to the inverter circuit (7) is detected. A frequency detection unit (11) subjects a current waveform of Iinv to a fast Fourier transform and detects a frequency of a frequency component having a maximum amplitude. A phase detection unit (12) detects a zero cross point of the frequency component having the maximum amplitude from the current waveform of Iinv. A carrier signal control unit (13) performs control so that a frequency and a rising timing of a PWM carrier signal for driving a converter circuit (4) are coincided with the frequency detected by the frequency detection unit (11) and the zero cross point detected by the phase detection unit (12).