JPH0629898A - Portable telephone set - Google Patents

Abstract

PURPOSE:To utilize the portable telephone set by the period of time determined in advance by having a sub-battery without suspending and terminating immediately its use, when a main battery is exchanged and an output of the main battery is gone, while a user is using the portable telephone set. CONSTITUTION:A main battery 11-1 supplies a power source to a radio telephone circuit 14, and in this case, a voltage detecting circuit 12 always monitors a voltage of the main battery 11-1. Therefore, when the voltage of the main battery 11-1 becomes below a certain level, the voltage detecting circuit 12 imparts a signal to a changeover switch 13 and a CPU 15. In the changeover switch 12, by switching the main battery 11-1 to a sub-battery 11-2, the power source is supplied to the radio telephone circuit 14. Also, the CPU 15 accesses a ROM 16, and displays a state switched to the sub-battery 11-2 from an LCD 17 or sounds an alarm sound from a loudspeaker 18. Subsequently, when a signal for stopping a display function and the alarm sound is inputted to the CPU 15 from a key pat 19, the CPU 15 access the ROM 16 and stops the display or the alarm sound.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile phone, and more particularly to supplying power to a mobile phone.

[0002]

2. Description of the Related Art Conventional mobile phones have a structure in which electric power is supplied only from a main battery, and a user is informed by a display function or an alarm sound when the capacity of the main battery is exhausted.

[0003]

The above-mentioned conventional mobile phone informs the user by the display function or the alarm sound when the battery capacity is exhausted, but the user can talk after the user knows that the battery capacity is exhausted. There is a problem that the call may end if the time is too short or the alarm sounds.

[0004]

A mobile phone according to the first aspect of the present invention has a main battery in a battery pack and a spare auxiliary battery for the main battery, and voltage detection means for detecting the voltage level of the main battery, The sub battery includes a switching unit for switching from the main battery to the sub battery, a display unit for notifying a user when the sub battery is switched, and an alarm sound generating unit for generating an alarm sound. It has stop means for stopping the display means and the alarm sound generating means for notifying that the switching has been performed.

The mobile phone according to the second aspect of the present invention has, in addition to the main battery for mainly supplying power, another sub battery inside, and when the power supply from the main battery is stopped, the sub battery is provided to the sub battery. Power supply means for supplying power so as to keep talking while switching the power source and exchanging the main battery; and switching means for switching the power source to the main battery after the main battery is exchanged,
Charging means for charging the sub-battery with the main battery.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of the first invention.

In FIG. 1, the mobile phone 1 of the first embodiment shows the voltage levels of the main battery 11-1 and its auxiliary sub battery 11-2 mounted in a battery pack, and the main battery 11-1. A voltage detection circuit 12 for detecting, a changeover switch 13 for changing over from the main battery 11-1 to the sub-battery 11-2 by a detection signal from the voltage detection circuit 12, and a radio telephone circuit 14 for receiving power supply via the changeover switch 13. The wireless telephone circuit 14 includes a ROM 16 having a control program for controlling the mobile phone 1, an LCD 17 for indicating that the main battery 11-1 has been switched to the sub battery 11-2, and an alarm sound. Generating speaker 18
And a keypad 19 for inputting display and stop of alarm sound, and a CPU 15 for controlling the entire mobile phone 1 by a control program stored in the ROM 16.

Next, the operation of this embodiment will be described.

First, the main battery 11-1 supplies power to the radio telephone circuit 14, and at this time, the voltage detection circuit 12 constantly monitors the voltage of the main battery 11-1. Therefore, the main battery 11-
When the voltage of 1 drops below a predetermined level, the voltage detection circuit 12 sends a signal to the changeover switch 13 and the CPU 15. The changeover switch 13 switches the main battery 11-1 to the sub battery 11-2 to supply power to the radio telephone circuit 14. In addition, the CPU 15 accesses the ROM 16 and
The LCD 17 indicates that the sub-battery 11-2 has been switched or an alarm sound is emitted from the speaker 18.

Next, when a signal for stopping the display function and the alarm sound is sent from the keypad 19 to the CPU 15, the CP
U15 accesses the ROM16 and stops the display and alarm sound.

Next, the second invention will be described.

FIG. 2 is a block diagram showing an embodiment of the second invention.

In FIG. 2, the mobile phone 2 of this embodiment has a main battery 22 which mainly supplies power to a radio telephone circuit 21,
A spare auxiliary battery 24 for the main battery 22 and the main battery 22
Of the output voltage of the main battery 2 and the power supply switch 25 that switches to the sub battery 24 when a predetermined voltage value is detected.
2 and a charging circuit 23 that charges the sub-battery 24.

Next, the operation of this embodiment will be described.

Power is normally supplied to the radio telephone circuit 21 inside the mobile telephone 2 from the main battery 22.

Further, the power supply of the radio telephone circuit 21 detects a drop in the output voltage of the main battery 22 by the power supply switch 25, and switches to the sub battery 24 when the voltage value reaches a predetermined value. Therefore, when the main battery 22 is removed for replacement, it is possible to immediately switch to the sub battery 24 by the power switch 25 to continue the call.

When the replacement of the main battery 22 is completed, the power source is switched to the main battery 22 again by the power source switching unit 25, and the sub battery 24 is charged from the main power source 22 via the charging circuit 23.

[0019]

As described above, according to the first aspect of the present invention, the main battery and the auxiliary sub battery thereof are provided in the battery pack,
A voltage means for detecting the voltage level of the main battery, a switching means for switching from the main battery to the sub battery, a display means for notifying the user when the sub battery is switched, and an alarm sound generating means for generating an alarm sound. With this, when the predetermined output of the main battery is exhausted during a call, the switching means switches to the sub-battery so that the user does not disturb the call and the alarm sound that the user can understand is provided. As a result, the user can recognize that the call can be made only for a predetermined time and can respond without suddenly ending the call.

Further, the first aspect of the present invention has an effect that the user can stop the display and the alarm sound at any time by having the display means or the stopping means for stopping the generation of the alarm sound.

Further, in the second aspect of the present invention, in addition to the main battery that mainly supplies power, another sub battery is built in, and when the power supply from the main battery is stopped, the power is supplied to the sub battery. Power supply means for supplying power to maintain a call while switching and replacing the main battery, switching means for switching the power to the main battery after replacing the main battery, and charging means for charging the sub battery by the main battery. The provision of such an effect has an effect that a call can be continuously performed when the main battery is replaced, and the sub battery can be charged from the main battery after the main battery is replaced.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the first invention.

FIG. 2 is a block diagram showing an embodiment of the second invention.

[Explanation of symbols]

 1, 2 Mobile phone 11 Battery pack 11-1, 22 Main battery 11-2, 24 Sub-battery 12 Voltage detection circuit 13 Changeover switch 14, 21 Wireless telephone circuit 15 CPU 16 ROM 17 LCD 18 Speaker 19 Keypad 23 Charging circuit 25 Power switch

Claims (3)

[Claims] 1. A battery pack having a main battery and a spare sub battery for the main battery, a voltage detecting unit for detecting a voltage level of the main battery, and a switching unit for switching from the main battery to the sub battery. It has display means for notifying the user when switching to the sub battery and alarm sound generating means for generating an alarm sound, and when the predetermined output of the main battery is exhausted during a call, A mobile phone characterized by switching to the sub-battery by a switching means and notifying the user of this by the display means or the alarm sound generating means. 2. The mobile phone according to claim 1, further comprising stop means for stopping the display means and the alarm sound generating means for notifying that the sub battery has been switched. 3. A main battery that mainly supplies power, and has another sub battery built therein, and when the power supply from the main battery is stopped, the power is switched to the sub battery to switch the main battery. Power supply means for supplying power so as to maintain a call while exchanging the battery, switching means for switching the power supply to the main battery after replacing the main battery, and charging means for charging the sub battery with the main battery. A mobile phone characterized by comprising.