| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power conversion device for an electric vehicle reducible in size even if the device is equipped with a converter device and inverter devices. <P>SOLUTION: The power conversion device for the electric vehicle comprises the converter device (3) of which the switching element is connected in a manner of single-phase bridging, and which converts a single-phase AC to a DC; first and second inverter devices (5a, 5b) of which each switching element is connected in a three-phase bridging, and each of which converts the DC converted by the converter device to a three-phase AC; a cooling medium circulation passage (11) in which the intermediate zone of a piping passage that circulates a cooling medium is divided into two branches, one branch (12) is thermally coupled to a U-phase switching element unit (3a) of the converter device and the first inverter device (5a), and the other branch (13) is thermally coupled to a V-phase switching element unit (3b) of the converter device and the second inverter device (5b); a pump (14) for circulating the cooling medium arranged at a main passage of the cooling medium circulation passage; and a heat exchanger (15) arranged at the main passage of the cooling medium circulation passage. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
