Power conversion device

A power conversion device comprising:

• a first switch provided on a first path connecting a first input/output terminal and a second input/output terminal;
• a second switch provided on the first path and connected in series with the first switch;
• a first inductor provided on a second path connecting a third input/output terminal and a connecting node located between the first switch and the second switch on the first path;
• a first current sensor circuit that detects an electric current flowing to the first inductor;
• and
• a first resonant period detection circuit that detects a resonant period of a first resonance phenomenon based on parasitic capacitance of the first switch and the second switch and inductance of the first inductor, the first resonance phenomenon occurring by switching operations of the first switch and the second switch, wherein
• energy accumulates in the first inductor in a first energy application period in which the second switch is OFF and the first switch is ON,
• the first resonance phenomenon occurs due to the energy that has accumulated in the first inductor in the first energy application period, and
• the first resonant period detection circuit detects the resonant period of the first resonance phenomenon based on a result of comparison between a reference voltage and a voltage generated from a resonance current flowing to the first inductor due to the first resonance phenomenon and detected by the first current sensor circuit.