Semiconductor unit and power conversion device

The present invention provides a semiconductor unit and a power conversion device. An inverter unit (200) comprises the following components: contacts (201a, 201b) which can be connected and separated from common power buses (101a,101b), a smoothing capacitor (203) which performs smoothing for the power obtained from the contacts (201a,201b), an inverter part (202) which inverts the power which is executed with smoothing by the smoothing capacitor (203), a current limiting component (204) which restrains the inrush current of the power from the contacts (201a,201b) to the smoothing capacitor (203), an initial charging switch (208) which is connected with the current limiting component (204) in parallel, a voltage detection circuit (206) which detects the charging current of the capacitor (203), and an initial charging switch operation circuit (207) for operating the initial charging current (208) according to the voltage detected by the voltage detection circuit (206). Therefore, in the operation of a plurali