Battery-driven electronic device and mobile communication...

Electricity: battery or capacitor charging or discharging – Battery or cell discharging – Regulated discharging

Reexamination Certificate

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Reexamination Certificate

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06882130

ABSTRACT:
The present invention provides a battery-driven electronic device for which a long time use of the battery can be achieved and mobile communications equipment such as a portable telephone. Even if the time at which the output voltage of a battery201becomes below the supply voltage required by a load206including a power amplifier for wireless communications comes earlier than a conventional lithium ion battery because of its discharge characteristics that the battery voltage change ratio is 0.25 or more, a step-up and -down converter200operates as follows. When the output voltage of the battery is higher than the supply voltage required by the load, the voltage is set to a predetermined supply voltage by the step-down operation mode. When the output voltage of the battery is decreased and becomes lower than the supply voltage required by the load, the voltage is set to a predetermined supply voltage by the step-up operation mode. Thus, even for a battery employing a new material having a high energy density, a long term use of the battery can be achieved.

REFERENCES:
patent: 5161097 (1992-11-01), Ikeda
patent: 5583421 (1996-12-01), Barbehenn et al.
patent: 5604924 (1997-02-01), Yokoya
patent: 6104759 (2000-08-01), Carkner et al.
patent: 4-315320 (1992-11-01), None
patent: 6-348654 (1994-12-01), None
patent: 2000-253653 (2000-09-01), None
patent: 2001-007715 (2001-01-01), None
patent: 2001-068168 (2001-03-01), None

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