POWER SUPPLY DEVICE AND ITS CONTROL METHOD

摘要

If the phenomenon that current (reactor current) flowing into a coil (32) stagnates at value 0 during a dead time when both of switching elements Tr1 and Tr2 are turned OFF immediately after the switching element Tr1 (upper arm) is turned from ON to OFF occurs at the switching cycle of the switching elements Tr1 and Tr2, it is judged that a cyclic zero current stagnation state is set in and a voltage instruction of a smoothing capacitor (42) is reduced by a predetermined voltage. This suppresses unexpected increase of the voltage of the smoothing capacitor (42) to exceed the voltage instruction in the cyclic zero current stagnation state and suppresses damage of the smoothing capacitor (42) by an excessive voltage or output of an excessive torque from motors MG1 and MG2.