| 摘要 |
<p>The emergency drive control has a series connected amplifier and pulse shaper stage, the amplifier stage serving simultaneously as an electric switch. Between the same and the control drive circuit is an inductive coupling. During mains operation the electronic switch is supplied by a blocking potential from a rectifier, this blocking preventing switching of the control pulses to the amplifier or a series connected transformer. The rectifier charge battery supplies the electronic components even in mains operation. The mains alternating voltage is supplied between the amplifier output and the series connected transformer in such manner that both the mains voltage and the pulses of the drive control are applied to the input of the transformer.</p> |
