| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the following problem: there is the possibility of impossible discharge control of a capacitor 16 when a vehicle has a collision. <P>SOLUTION: A series regulator 40 steps down a voltage of a capacitor 16 and outputs the stepped-down voltage to a drive unit DU of a U-phase lower arm. A flyback converter FBd for discharge control outputs electric power to a drive unit DU of a U-phase upper arm with an output of the series regulator 40 as an input. When a collision is detected, a photocoupler 54 is turned off, so that the series regulator 40 is turned on and hence a U-phase switching element Swn is turned on. Also, a power supply switching element 64 of the flyback converter FBd for discharge control is on-off controlled, thus turning on and off a switching element Swp according to a change in the output voltage of a secondary coil 60b of a transformer 60. <P>COPYRIGHT: (C)2012,JPO&INPIT |
