Electric lamp and discharge devices: systems – Combined load device or load device temperature modifying... – Portable self-contained
Reexamination Certificate
2009-02-26
2011-12-27
Chang, Daniel D (Department: 2819)
Electric lamp and discharge devices: systems
Combined load device or load device temperature modifying...
Portable self-contained
C315S308000, C315S20000A
Reexamination Certificate
active
08084946
ABSTRACT:
A handheld electronic device includes a processor; a battery; a flash device; a number of loads powered by the battery; and a flash driver outputting a flash current to the flash device. The processor determines a temperature operatively associated with the battery and different voltage values corresponding to different combinations of the loads as a function of the determined temperature, and starts the flash device at a predetermined flash current value. The flash driver selects a corresponding different voltage value as a function of: (a) a determined number of the loads which are active, or (b) a current flowing from the battery; determines the battery voltage, and if the battery voltage is less than or equal to the corresponding different voltage value, reduces the flash current below the predetermined flash current value until the battery voltage is greater than the corresponding different voltage value.
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Texas Instruments Incorporated, Single Cell Li-Ion and Li-Pol Battery Gas Gauge IC for Portable Applications (bqJUNIOR), Mar. 2006, 31 pp.
Allard Louis B.
Borden Ladner Gervais LLP
Chang Daniel D
Research In Motion Limited
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