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FIRING CIRCUIT FOR SERIES-CONNECTED CONTROLLED SEMICONDUCTOR RECTIFIERS

  • US 3,593,038 A
  • Filed: 08/15/1966
  • Issued: 07/13/1971
  • Est. Priority Date: 08/13/1965
  • Status: Expired due to Term
First Claim
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1. In a chain of series-connected semiconductor controlled rectifiers having a voltage divider connected in parallel to said rectifier chain, each rectifier having a control electrode and at least one main electrode and firing circuit connected to the control electrode and one of the main electrodes of said rectifier on the one hand and on the other hand to two different points on the voltage divider, said firing circuit comprising means to derive a control voltage from the voltage between said points on the voltage divider and switching means for connecting said control voltage to the control electrode, thereby firing the rectifier, said means to drive a control voltage comprising a rectifying means connected to said points on the voltage divider and a capacitor connected to said rectifying means, said capacitor being also connected to said switching means, said voltage deriving means including a transformer, said transformer having input and output terminals, said input terminals being connected to said two points on the voltage divider, at leaSt one of said output terminals being connected to said rectifying means.

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