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Cordless power tool with overcurrent protection circuit permitting the overcurrent condition during specified time periods

DC
  • US 7,521,892 B2
  • Filed: 04/04/2006
  • Issued: 04/21/2009
  • Est. Priority Date: 04/04/2005
  • Status: Expired due to Fees
First Claim
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1. A power tool comprising:

  • a battery comprised of a plurality of lithium battery cells connected in series;

    a DC motor connected to the battery and supplied with a driving current from the battery; and

    means for permitting an overcurrent defined by a current having a value equal to or greater than a predetermined value to flow during a start-up period of the motor and for prohibiting the overcurrent to flow in the current path when the motor is brought into a locked state of operation.

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