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Microcomputer-controlled DC three-wire circuit for vehicle

  • US 4,604,565 A
  • Filed: 05/20/1983
  • Issued: 08/05/1986
  • Est. Priority Date: 05/20/1982
  • Status: Expired due to Term
First Claim
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1. A microcomputer-controlled DC three-wire circuit for a vehicle, comprising;

  • first and second charging generators driven by an engine of said vehicle and magnetically separated from one another, and each having a rectifier;

    a first voltage regulator for detecting an output voltage of said first charging generator, and for controlling said output voltage to a first predetermined value;

    a second voltage regulator for detecting an output voltage of said second charging generator, and for controlling said output voltage to a second predetermined value;

    a first battery switch unit, a first battery connected through said first battery switch unit between a pair of terminals of said first charging generator;

    a starter switch electrically connected to at least said first battery;

    a second battery switch unit, a second battery connected through said second battery switch unit between a pair of terminals of said second charging generator; and

    an electric load connected between a positive terminal of one of said charging generators and a negative terminal of the other of said charging generators, andmeans including a microcomputer which receives data on the on-off states of said first and second battery switch units, one of (a) first and second engine-speed related output signals of said first and second charging generators, respectively, or, (b) rotation signal data from said engine, and an output signal of said starter switch, for protecting said rectifiers in said first and second charging generators and said load and for preventing undue discharging of said first and second batteries.

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