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CONTROL LOGIC FOR SWITCHING RECTIFIER SYSTEMS

  • US 3,764,885 A
  • Filed: 08/18/1971
  • Issued: 10/09/1973
  • Est. Priority Date: 08/19/1970
  • Status: Expired due to Term
First Claim
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1. For use in controlling current converters composed of two groups of controlled rectifiers arranged in a circuit which is free of circulating current and includes current means for producing output signals dependent upon the desired value and the actual value of the current in the circuit, a switching logic having inputs coupled to the output of said current means and an output coupled to the two groups of controlled rectifiers for selectively blocking or releasing triggering pulses to the two converter groups in response to the signals applied to said logic inputs and which are dependent on the desired value and the actual value of the current in the circuit, the improvement wherein said logic comprises:

  • a plurality of operational amplifiers connected to operate as switches for processing the input signals to said logic; and

    a first switching transistor connected between the output and the input of a first of said operational amplifiers so as to form a regenerative feedback branch of said first amplifier for causing said amplifier to operate as a storage element when said switching transistor is conductive and as a signal comparator when said switching transistor is nonconductive so as to enable the polarity of the desired current value to be determined.

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