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。

公开(公告)号：US5061883A

公开(公告)日：1991-10-29

申请号：US379213

申请日：1989-07-13

申请人： Yumiko Asano ,  Hideo Obi ,  Shigeya Ohhama

发明人： Yumiko Asano ,  Hideo Obi ,  Shigeya Ohhama

IPC分类号： B60L7/14 ,  B60L7/24

CPC分类号： B60L7/24 ,  B60L2200/26

摘要： A braking system for an electric railcar having an a.c. motor with a variable voltage variable frequency inverter. The inverter controls the voltage and frequency supplied to the a.c. motor in response to the railcar speed, commands from the cab, load conditions, etc. The braking system also includes a pneumatic brake which operates at low speeds. A control circuit operates the inverter to supply electric braking down to a slow speed and then simultaneously applies electric braking and pneumatic braking, smoothly increasing the pneumatic braking force until the railcar stops. During the transistion from electric braking to pneumatic braking the control circuit maintains an output frequency from the inverter to the a.c. motor in the vicinity of 0 Hz, keeping the voltages in the positive phase range.

摘要翻译： 一种具有直流电动机的电车的制动系统。 电机带有可变电压变频器。 变频器控制提供给交流电源的电压和频率。 电机响应于轨道车速度，来自驾驶室的命令，负载条件等。制动系统还包括以低速操作的气动制动器。 控制电路操作逆变器，将电动制动降低到低速，然后同时施加电动制动和气动制动，平稳地增加气动制动力，直到轨道车辆停止。 在从电制动到气动制动的过程中，控制电路保持从逆变器到直流的输出频率。 电机在0 Hz附近，将电压保持在正相位范围内。