Power Conversion System

Abstract: The problem of the present invention is to performing soft switching more reliably. In the present invention, a control device (3) shifts to control in a second period by turning off a second semiconductor switching element (Q6) once, in a first period, an excitation current (iLm) starts to flow in the negative direction and discharging of a first parasitic capacitor (C5) between both ends of a first semiconductor switching element (Q5) and a second parasitic capacitor (C6) between both ends of the second semiconductor switching element (Q6) has concluded. A second control unit (5) controls the first semiconductor switching element (Q5) so that the individual timings at which the first semiconductor switching element (Q5) is turned on and off will be when discharging of the first parasitic capacitor (C5) ends. The second control unit (5) controls the second semiconductor switching element (Q6) so that the timing at which the second semiconductor switching element (Q6) is turned on and off is when discharging of the second parasitic capacitor (C6) ends.

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