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Amperage control for protection of battery over current in power tools

  • US 7,276,878 B2
  • Filed: 09/29/2006
  • Issued: 10/02/2007
  • Est. Priority Date: 02/18/2003
  • Status: Expired due to Fees
First Claim
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1. A power tool, comprising:

  • a housing;

    a motor disposed within the housing and providing torque to the power tool;

    a power supply disposed within the housing and including a plurality of lithium ion batteries providing a direct voltage between 30 and 40 volts to the motor; and

    a pulse width modulation controller within the housing for varying the pulse width of voltage pulses supplied to the motor based on a comparison of the motor current to one of a plurality of different thresholds.

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