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Electric power supply system for motor vehicle

  • US 5,021,727 A
  • Filed: 01/12/1989
  • Issued: 06/04/1991
  • Est. Priority Date: 01/18/1988
  • Status: Expired due to Term
First Claim
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1. A power supply system for a motor vehicle equipped with an electric system including a first group of electrical loads having a relatively high rated voltage and a second group of electrical loads having a relatively low rated voltage, comprising:

  • a generator, provided with a voltage regulator, for producing an output voltage substantially equal to said high rated voltage at an output terminal, said output terminal being connected to said first group of electrical loads;

    a switching element interposed between said output terminal of said generator and said second group of electrical loads; and

    a duty cycle control circuit for generating a rectangular waveform signal having a predetermined duty ratio for turning on said switching element with a predetermined duty factor.

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