Method and apparatus for maximizing the sustainable flash of...

Details Method and apparatus for maximizing the sustainable flash of... Method and apparatus for maximizing the sustainable flash of...

2009-11-17

2011-10-18

Vu, David Hung (Department: 2821)

Electric lamp and discharge devices: systems

Discharge device and/or rectifier in the supply circuit

Flashers

C315S24100S

Reexamination Certificate

active

08040069

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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patent: 2002/0171372 (2002-11-01), Motomura et al.
patent: 2004/0117137 (2004-06-01), Jin et al.
patent: 2000 047307 (2000-02-01), None

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