Method and circuit for charging of super capacitor as energy...

Details Method and circuit for charging of super capacitor as energy... Method and circuit for charging of super capacitor as energy...

2011-08-02

2011-08-02

Perkey, W. B. (Department: 2862)

Photography

With object illumination for exposure

With power supply detail

C315S24100S, C315S24100S

Reexamination Certificate

active

07991282

ABSTRACT:
A circuit and method for charging a super capacitor to an optimal voltage that provides a desired flash diode current value while minimizing power dissipation in circuit elements other than the flash diode. One embodiment uses periodic sampling of the current through the flash diode and termination of the charging upon the super capacitor having been charged to a voltage value that produces the desired flash diode current. Another embodiment includes a current regulator in the flash diode firing circuit that keeps the current at a substantially constant level during the time that the flash diode is being fired.

REFERENCES:
patent: 2006/0159441 (2006-07-01), Feng et al.
patent: 2008/0136960 (2008-06-01), Kawakami
patent: 2009/0128045 (2009-05-01), Szczeszynski et al.

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