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Electrical circuit for providing a reduced average voltage

  • US 6,744,146 B2
  • Filed: 09/05/2002
  • Issued: 06/01/2004
  • Est. Priority Date: 09/05/2002
  • Status: Expired due to Term
First Claim
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1. An electrical system comprising:

  • a direct current (DC) voltage source providing a first voltage;

    an alternating current (AC) starter-alternator mechanism configured for warm cranking an engine and converting rotational energy from the engine into an AC current;

    a starter mechanism, rated at a second voltage which is lower than the first voltage, for cold cranking the engine; and

    a circuit coupled to the voltage source for;

    providing the second voltage to the starter mechanism in response to a switch closing; and

    in response to the switch opening, ceasing to provide the second voltage to the starter mechanism;

    transferring energy from the DC voltage source to the AC starter-alternator mechanism; and

    converting the AC current, converted from the engine by the starter-alternator, to a DC current in order to charge the voltage source.

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