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On-board charging system for electric lawn mower

  • US 5,727,372 A
  • Filed: 05/30/1996
  • Issued: 03/17/1998
  • Est. Priority Date: 05/30/1996
  • Status: Expired due to Term
First Claim
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1. A self-contained battery charger apparatus for charging a battery for an electrically powered turf mower, the battery having a voltage, comprising:

  • a) an AC to DC converter for accepting a source of AC power and providing a DC current source output;

    b) a regulator device operatively connected between said converter for receiving said current source output and the battery, wherein said regulator device is responsive to control signals for selectively providing said current source output to the battery;

    c) first sensor means for measuring the voltage of the battery and providing a first voltage signal;

    d) second sensor means for measuring the current delivered to the battery and providing a second voltage signal; and

    e) controller means, operatively connected to said first and second sensor means and said regulator device, for determining the voltage of the battery from said first voltage signal, for determining the current provided to the battery from said second voltage signal, and for providing a pulse width modulated control signal to said regulator device to provide a periodic constant current level to the battery based on said determined battery voltage and current.

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