| 摘要 |
A power control unit is provided with a converter; a filter capacitor that is connected onto one side of converter; a smoothing capacitor that is connected onto the other side of converter; an MG-ECU that is operated to control converter with power supplied from filter capacitor; and a casing that houses these constituent elements therein. In order to electrically discharge filter capacitor and smoothing capacitor, an MG-ECU controls converter in such a manner as to alternately repeat ON/OFF of an npn-type transistor for a lower arm of an IPM and ON/OFF of an npn-type transistor for an upper arm of IPM, and further, to set a time of ON of npn-type transistor for the upper arm longer than that of ON of npn-type transistor for the lower arm.
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