| 摘要 |
PURPOSE:To realize quick restart after power interruption due to overvoltage by a constitution wherein a power supply interrupting means opens a disconnector when a voltage detector detects terminal voltage of a filter capacitor higher than a predetermined level thus discharging the filter capacitor through a resistor and then a power supply restarting means throws in the disconnector, CONSTITUTION:When an overvoltage detector 7 detects a voltage higher than a set level, an OFF signal is fed to a GTO thyristor 5 thus closing the contact 13a of an overvoltage detector 13. Since b contact 16b of a relay opens, discharging takes place gradually through a resistor 18 and a capacitor 19 and the exciting coil 10c of a discharge contactor 10A is deenergized slowly thus closing the discharge contactor 10A after opening of a disconnector 2A. Consequently, a filter capacitor 4 is discharged through a charging resistor 9, a filter reactor 3, the discharge contactor 10A and a discharge resistor 11. After the exciting coil 16c of a relay is deenergized, the b contact 16b of the realy closes to restart the auxiliary power supply for vehicle automatically. |
