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DUAL VOLTAGE SYSTEM

  • US 3,667,025 A
  • Filed: 06/21/1971
  • Issued: 05/30/1972
  • Est. Priority Date: 06/21/1971
  • Status: Expired due to Term
First Claim
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1. In a vehicle electrical system:

  • a. first and second DC load conductors, said second load conductor connected to a point of constant reference potential;

    b. direct voltage generating means connected between said first and second DC load conductors;

    c. first and second batteries connected in series between said first and second DC load conductors and defining a junction therebetween having a voltage thereat;

    d. an electrical load circuit connected in parallel with said second battery between said junction and said second conductor means;

    e. DC to DC converter means having input, output, and control terminals, said input terminals connected across said first battery and said output terminals connected across said second battery, said converter operable to charge said second battery from either said first battery or said generator; and

    f. voltage regulator means connected between said junction and control terminals, said voltage regulator means responsive to the voltage at said junction and operative to cause said converter to maintain said voltage at said junction at a predetermined proportion of the voltage between said first and second DC load conductors.

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