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Power circuit with shunt transistor

  • US 3,939,399 A
  • Filed: 06/07/1974
  • Issued: 02/17/1976
  • Est. Priority Date: 06/11/1973
  • Status: Expired due to Term
First Claim
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1. A power circuit comprising:

  • a control transistor having a control terminal, an input terminal and an output terminal, said input terminal being connected with one terminal of the power source while said output terminal being connected with one terminal of a load;

    an error detecting amplifier circuit connected across the load, for detecting and amplifying changes of the load voltage;

    a drive transistor having a control terminal being connected with the output terminal of said error detecting amplifier circuit, a common terminal being connected with the other terminals of the power source and of the load, and an output terminal, which is for amplifying the output current of said error detecting amplifier circuit and supplying it to said control transistor;

    a transistor for detecting the difference between the input voltage to and the output voltage from said control transistor, which conducts to produce at an output terminal an output current in accordance with said voltage difference when said voltage difference decreases to below a predetermined value of voltage; and

    a shunt transistor having an input terminal connecting with the control terminal of said drive transistor, an output terminal connected with the other terminals of the power source and the load, and a control terminal connected with the output terminal of said difference detecting transistor to shunt the current supplied from said error detecting amplifier circuit to said drive transistor in accordance with the output current from said difference detecting transistor.

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