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METHOD AND APPARATUS FOR MAXIMIZING THE SUSTAINABLE FLASH OF A HANDHELD PORTABLE ELECTRONIC DEVICE

  • US 20100060178A1
  • Filed: 11/17/2009
  • Published: 03/11/2010
  • Est. Priority Date: 01/08/2007
  • Status: Active Grant
First Claim
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1. A method for maintaining a maximum sustainable flash current over a whole length of a flash in a handheld electronic device powered by a battery of a given type, wherein the handheld electronic device places other variable loads on the battery in addition to the flash, comprising the steps of:

  • (a) calculating a first ESR of the battery based on a flash current at the battery following initiation of the flash at a given current;

    (b) calculating a new ESR value for a pre-selected time period after step (a), within the length of the flash, based on the first ESR and known ESR characteristics for the given type of battery;

    (c) calculating a new flash current based on the new ESR value; and

    (d) adjusting the flash current upwards or downwards to approximate the new flash current.

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