公开(公告)号：US4894745A

公开(公告)日：1990-01-16

申请号：US852486

申请日：1986-04-16

申请人： Eiji Akagawa ,  Hideo Obi ,  Yumiko Asano

发明人： Eiji Akagawa ,  Hideo Obi ,  Yumiko Asano

IPC分类号： B60L3/04 ,  B60L3/00 ,  H02H11/00

CPC分类号： H02H11/005 ,  B60L3/0069 ,  B60L3/0084 ,  B60L3/04 ,  B60L9/22 ,  B60L2200/26

摘要： A protection circuit for preventing an over-current condition if the semiconductor power controller in an electric train power control circuit is defective. The power controller is connected in series through first and second switches to a D.C. power source. A capacitor is also connected to the power source through the two switches and through a charging resistor connected in parallel with the second switch. When the first switch is closed, the capacitor is charged through the first switch and the resistor. After the capacitor voltage reaches a set reference voltage during a predetermined time interval, the second switch is closed to permit the power control equipment subsequently to apply power to the driving motor of the train. If the capacitor voltage does not reach the reference voltage during the predetermined time interval, then the second switch remains open and the first switch is re-opened to completely disconnect the power control equipment from the D.C. power source.

摘要翻译： 如果电力系统功率控制电路中的半导体功率控制器有缺陷，则用于防止过电流状态的保护电路。 功率控制器通过第一和第二开关串联连接到直流电源。 电容器还通过两个开关和通过与第二开关并联连接的充电电阻器连接到电源。 当第一开关闭合时，电容器通过第一开关和电阻器充电。 在预定时间间隔期间电容器电压达到设定的参考电压之后，第二开关闭合，以允许电力控制设备随后向列车的驱动电机施加电力。 如果电容器电压在预定的时间间隔内未达到参考电压，则第二开关保持断开，并且第一开关被重新打开，从而将电力控制设备与直流电源完全断开。