| 摘要 |
<p>PURPOSE:To simplify and to eliminate contacts of a main circuit by performing the charging of a filter capacitor and the interrupting function of the main circuit of a DC electric railcar by a common GTO thyristor. CONSTITUTION:After a pantograph 4 is raised and a line breaker 5 is closed, a charge controller 9 generates a GTO ON gate command SON. A gate driving circuit 10 generates ON and OFF gate pulses to repeat a GTO thyristor ON and OFF in response to the signal SON. Thus, a filter capacitor 8 is charged. When the capacitor 8 is sufficiently charged, an inverter 1 operates. When a malfunction detector 11 detects the overcurrent or its cause of a main circuit, it generates an OFF gate command SOFF to turn OFF a GTO thyristor 61.</p> |
