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    • 57. 发明授权
    • Protective circuit for d.c. circuit
    • 直流保护电路 电路
    • US4126889A
    • 1978-11-21
    • US787844
    • 1977-04-15
    • Masahiko IbamotoShigeru KuriyamaGenichi Matsumoto
    • Masahiko IbamotoShigeru KuriyamaGenichi Matsumoto
    • H02H7/12H02H3/00H02H7/08H02M3/135H02H3/24
    • H02H7/0844Y10S388/903Y10S388/92
    • A protective circuit for protecting a main d.c. circuit of the kind comprising a d.c. power source, a d.c. load, a contactor and a chopper. In the protective circuit, a resistor is connected in parallel with the series-connected contactor and load to permit continuous application of power supply voltage across the chopper. A circuit is connected to the connection point of the load and chopper to provide a signal synchronous with on-off of the chopper, and the output signal of this circuit and a signal corresponding to a chopper-on signal are applied to a logic circuit which provides the logical sum of these inputs for the detection of commutation failure of the chopper. The output of the logic circuit turns on a thyristor for deenergizing the contactor thereby disconnecting the load from the power source.
    • 保护主要直流电路的保护电路 电路包括直流电源。 电源,直流 负载,接触器和斩波器。 在保护电路中,电阻器与串联的接触器和负载并联连接,以允许在整流器上连续施加电源电压。 电路连接到负载和斩波器的连接点,以提供与斩波器的开 - 关同步的信号,并且该电路的输出信号和对应于斩波信号的信号被施加到逻辑电路,逻辑电路 提供这些输入的逻辑和,用于检测斩波器的换向故障。 逻辑电路的输出导通一个用于断电接触器的晶闸管,从而将负载从电源断开。