| 摘要 |
PURPOSE:To prevent interruption of power supply in a vehicle by rectifying the output of an inverter and charging a capacitor at the input side of the inverter, and turning a switch element at the input side of the non-conducting inverter ON when an electric vehicle detects a no-voltage section thereby discharging the capacitor. CONSTITUTION:AC voltage taken in from a stringing 2 is transformed 4 and rectified 11 and then it is fed through a filter reactor 13 to an inverter 15 which feeds VVVF power to loads in an AC electric vehicle. AC output voltage of the inverter 15 is transformed through a charging transformer 26 and then rectified through a charging rectifier 25 in order to charge a capacitor 24. When a voltage detector 21 detects a no-voltage section of stringing, a non-conducting thyristor switch 22 is turned ON to discharge the capacitor 24 thus driving the inverter 15 together with the energy stored in the filter reactor 13. According to the constitution, power is not interrupted in the electric vehicle and intrusion of surge current from the stringing is prevented. |
