US 2001/0055986 A1 · Electric power supply device and portable information device

Abstract

The electric power supply device is incorporated in a wristwatch-type communication device having functions corresponding to those of the a watch and a portable telephone and has a power supply section constituted of a lithium-ion battery, a control section for controlling the operation of the entire device, a time measuring section having a clock function, a communication section having a telephone function, a first voltage detection section for detecting a drop in a voltage supplied from the power supply section below the voltage at which the communication section can operate, and a power supply shutoff section for stopping supply of electric power to the communication section by breaking the connection to the power supply section when a voltage drop below the predetermined level is detected by the first voltage detection section.

Claims8

Dependent claims

An electric power supply device comprising:

a time measuring device for measuring a current time;
a communication device for transmitting and receiving data to and from another communication device;
voltage detection means for detecting a drop below a predetermined value in a voltage applied to the time measuring device and the communication device;
power supply stop means for stopping supply of electric power to the communication device when a drop below the predetermined value in the voltage applied to the time measuring device and the communication device is detected by the voltage detection means;
and
display means for displaying on a display the current time measured by the time measuring device and information that the communication device has become unable to operate when a drop below the predetermined value in the voltage applied to the time measuring device and the communication device is detected by the voltage detection means.

3 more elements

A portable electronic device comprising:

communication means for transmitting and receiving data;
first voltage detection means for ascertaining whether a voltage applied to the communication means is lower than a predetermined voltage value for driving the communication means;
time measuring means for measuring time with a drive voltage lower than that of the communication means;
second voltage detection means for ascertaining whether a voltage applied to the time measuring means is lower than the predetermined voltage value for driving the time measuring means;
a power supply for supplying electric power at least to the communication means and the time measuring means;
control means for stopping the communication means when the voltage of the power supply is lower than the predetermined voltage value of the first voltage detection means and equal to or higher than the predetermined voltage value of the second voltage detection means;
and
display means for displaying on a display information that the communication means is stopped and the current time measured by the time measuring means when the voltage of the power supply is lower than the predetermined voltage value of the first voltage detection means and equal to or higher than the predetermined voltage value of the second voltage detection means.

5 more elements

Dependencies are inferred from the claim text.

Electric power supply device and portable information device

Life of this patent

Electric power supply device and portable information device

Life of this patent

Abstract

Claims8