| 摘要 |
PURPOSE:To effectively limit an overcurrent by a fuse by connecting the fuse in series with a plurality of semiconductor elements which form arms, and connecting nonlinear resistors in parallel with the series circuit. CONSTITUTION:The arm of a power converter is composed by connecting in series unit circuits 1-m in which nonlinear resistors 31-3m are connected in parallel with series connecting circuit of fuses 11-1m and thyristors 21-2m. When the thyristors 21-2m become overcurrent states during their energization, the fuses 11-1m start melting, and when the melting of the fuses if proceeded, the fuses 11-1m generate arc voltages corresponding to the circuit voltage. The arc voltages generated from the fuses 11-1m are suppressed to the limiting voltages of the resistors 31-3m by the operations of the resistors 31-3m.
|
