×

Rechargeable battery measurement and calibration system and method

  • US 6,486,636 B1
  • Filed: 04/19/2002
  • Issued: 11/26/2002
  • Est. Priority Date: 04/19/2002
  • Status: Expired due to Term
First Claim
Patent Images

1. A rechargeable battery measurement system, comprising:

  • a power source which provides a DC supply voltage, a battery charging circuit which is switchably powered by said DC supply voltage and which, when powered, provides a charging current suitable for charging a rechargeable battery which is part of a battery pack, a current sensing element external to said battery pack and connected to carry current provided to and drawn from said battery pack, a current measurement circuit connected to said current sensing element and arranged to produce an output which varies with said sensed current, said current measurement circuit connected such that it is powered by current which does not pass through said current sensing element when said charging circuit is providing charging current to said battery pack, and a system host, said measurement system arranged such that said system host is powered by said DC supply voltage when present and by said battery pack otherwise, said system host connected to receive said current measurement circuit output and programmed to calculate battery status information for presentation to a user based on said current measurements.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×