×

High voltage temperature compensated foldback circuit

  • US 4,587,476 A
  • Filed: 09/29/1983
  • Issued: 05/06/1986
  • Est. Priority Date: 09/29/1983
  • Status: Expired due to Fees
First Claim
Patent Images

1. A foldback circuit, comprising:

  • a first conductor path including in series, an input terminal connectable to a direct current power supply, shutoff circuitry including transistor means, and an output terminal connectable to a load; and

    control circuitry for the shutoff circuitry including an operational amplifier connected to operate the shutoff circuitry in response to a load demand which exceeds a current pass limit, to decrease the base current of the transistor means and cause the output current to foldback, said operational amplifier including a +V terminal connected to input voltage, a -V terminal connected to ground, an output terminal connected to the base of the transistor means, a noninverting input terminal, means powered by the input voltage and connected to provide a reference voltage at the noninverting input terminal which is less than but varies directly with the input voltage, an inverting input terminal, a conductor extending from a point in the first conductor path ahead of the shutoff circuitry to the inverting input terminal, and a foldback conductor extending from a point in the first conductor path between the shutoff circuitry and the output terminal to the inverting input terminal.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×