Electric power conversion device

An electric power conversion device expressed as an equivalent circuit comprising: a power supply; a first parasitic inductance; a first diode; a second parasitic inductance connected to the first diode in series; a second diode connected to the first diode in parallel; a third parasitic inductance connected to the second diode in series; a switching element; a gate circuit; and a load, wherein the equivalent circuit includes a first circuit loop and a second circuit loop, the first circuit loop includes the power supply, the first parasitic inductance, the first diode, the second parasitic inductance, the switching element, and the gate circuit, the second circuit loop includes the power supply, the first parasitic inductance, the second diode, the third parasitic inductance, the switching element, and the gate circuit, where a first LC resonance frequency based on the first parasitic inductance and the second parasitic inductance of the first circuit loop and a junction capacitance of the first diode is denoted as f1 and a second LC resonance frequency based on the first parasitic inductance and the third parasitic inductance of the second circuit loop and a junction capacitance of the second diode is denoted as f2, the first LC resonance frequency f1 and the second LC resonance frequency f2 are different frequencies.