Method and apparatus for maximizing the sustainable flash of a handheld portable electronic device
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United States of America Patent
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Dec 15, 2009
Grant Date -
Jul 10, 2008
app pub date -
Jan 8, 2007
filing date -
Jan 8, 2007
priority date (Note) -
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Abstract
A method and apparatus for maintaining a maximum sustained flash current over the whole length of a flash using a programmable current drive in a handheld portable device powered by a battery. The method involves measuring the battery voltage before and after a flash is initiated and calculating the equivalent series resistance (ESR) of the battery. The calculated ESR is then used to adjust the flash current. The process may be repeated to correct for errors in the flash current.
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