Portable information terminal and power supply control method therefor
First Claim
1. A portable information terminal having a plurality of functions, comprising:
- a plurality of function processing units which respectively perform the functions;
a battery which supplies electric power to the function processing units;
a remaining battery charge detecting unit which detects remaining battery charge of the battery; and
a power supply control unit which compares the remaining battery charge with each of power supply limiting values determined in advance with respect to the function processing units, and, when the remaining battery charge becomes lower than at least one of the power supply limiting values of the function processing units, stops power supply to the at least one of the function processing units and/or outputs warning signals.
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Accused Products
Abstract
This invention relates to a portable information terminal having a plurality of functions such as a radio communication terminal unit, a data processing terminal unit, a digital camera unit, etc. The portable information terminal comprises a plurality of function processing units which respectively perform the functions; a battery which supplies electric power to the function processing units; a remaining battery charge detecting unit which detects remaining battery charge of the battery; and a power supply control unit. This power supply control unit compares the remaining battery charge with each of power supply limiting values determined in advance with respect to the function processing units, and, when the remaining battery charge becomes lower than at least one of the power supply limiting values of the function processing units, the power supply control unit stops power supply to the at least one of the function processing units and/or outputs warning signals.
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Citations
4 Claims
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1. A portable information terminal having a plurality of functions, comprising:
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a plurality of function processing units which respectively perform the functions;
a battery which supplies electric power to the function processing units;
a remaining battery charge detecting unit which detects remaining battery charge of the battery; and
a power supply control unit which compares the remaining battery charge with each of power supply limiting values determined in advance with respect to the function processing units, and, when the remaining battery charge becomes lower than at least one of the power supply limiting values of the function processing units, stops power supply to the at least one of the function processing units and/or outputs warning signals.
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2. A portable information terminal having a plurality of functions, comprising:
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a plurality of function processing units which respectively perform the functions;
a battery which supplies electric power to the function processing units;
a CPU which controls the function processing units;
a remaining battery charge detecting unit which detects remaining battery charge of the battery; and
a processing control unit which compares the remaining battery charge with each of power supply limiting values determined in advance with respect to the function processing units, and, when the remaining battery charge becomes lower than at least one of the power supply limiting values of the function processing units, controls the CPU so that the CPU restricts the operation of the at least one of the function processing units.
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3. A power supply control method for a portable information terminal having function processing units which respectively perform a plurality of functions, comprising:
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detecting a remaining battery charge of a battery which supplies electric power to the function processing units which respectively perform the functions;
comparing the remaining battery charge with each of power supply limiting values determined in advance with respect to the function processing units; and
when the remaining battery charge becomes lower than at least one of the power supply limiting values of the function processing units, stopping power supply to the at least one of the function processing units and/or outputting warning signals.
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4. A power supply control method for a portable information terminal having function processing units which respectively perform a plurality of functions, comprising:
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detecting a remaining battery charge of a battery which supplies electric power to the function processing units. comparing the remaining battery charge with each of power supply limiting values determined in advance with respect to the function processing units; and
when the remaining battery charge becomes lower than at least one of the power supply limiting values of the function processing units, controlling a CPU, which controls the function processing units, so as to restrict the operation of the at least one of the function processing units.
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Specification