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Vehicle windshield heater utilizing regulator output current control with a voltage divider

  • US 5,187,350 A
  • Filed: 04/29/1992
  • Issued: 02/16/1993
  • Est. Priority Date: 06/06/1989
  • Status: Expired due to Fees
First Claim
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1. An ice melting system in a motor vehicle having an engine, a generator drivable by the engine, a voltage regulator for controlling the generator, a windshield having a heater, and a battery, said ice melting system comprising:

  • a first switch disposed in a circuit interconnecting the generator and the heater so that AC electric energy generated by the generator is supplied to the heater when said first switch is closed;

    a rectifier for rectifying AC electric energy generated by the generator into DC electric energy;

    a second switch disposed in a circuit interconnecting the rectifier and the battery;

    voltage dividing means for dividing a voltage produced by said rectifier at a predetermined ratio;

    a third switch shiftable between a first condition in which the voltage regulator is connected to said circuit interconnecting the rectifier and the battery, and a second condition in which said voltage dividing means is connected to the voltage regulator when the heater operates;

    operation command means for giving an operation command to command operation of the heater; and

    a control circuit for closing said first switch, opening said second switch, and shifting said third switch to said second condition when said operation command means commands operation of the heater.

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