Power conversion device for cancelling leakage current

A power conversion device, comprising:

• first and second semiconductor switching elements connected together at a first connection point;
• third and fourth semiconductor switching elements connected together at a second connection point, the first, second, third, and fourth semiconductor switching elements configured to convert power from a power source and to supply the power to a load;
• a voltage potential variation suppression device configured to suppress voltage potential variations at the first connection point and the second connection point, the voltage potential variation suppression device comprising a reactor, a first ground capacitor and a second ground capacitor, the reactor including a main winding connected to the first connection point, and an auxiliary winding connected to the first and second ground capacitors, the main winding and the auxiliary winding being configured such that a voltage in the main winding generates an induced voltage in the auxiliary winding having a polarity opposite from the voltage in the main winding, the reactor and the first ground capacitor being connected between the first connection point and ground, the reactor and the second ground capacitor being connected between the second connection point and ground, wherein
• the voltage potential variation suppression device is configured to suppress the voltage potential variations at the first connection point by cancelling a first leakage current, which flows to a ground point from the first connection point via a parasitic capacitance due to the voltage potential variation at the first connection point at first and second opposing polarities of an alternating current voltage, with a first compensating current flowing via the reactor and the first ground capacitor connected to the first connection point, and
• the voltage potential variation suppression device is configured to suppress the voltage potential variations at the second connection point by cancelling a second leakage current, which flows to the ground point from the second connection point via a parasitic capacitance due to the voltage potential variation at the second connection point at the second polarity of the alternating current voltage, with a second compensating current flowing via the reactor and the second ground capacitor.