JP2010016849A - Power transfer system between cellular phones - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power transfer system for remarkably increasing opportunities to be able to charge one's own cellular phone even when an information terminal such as a notebook computer is not carried together with the cellular phone when the battery is going to be exhausted at a going-out place, or the like. <P>SOLUTION: The power transfer system includes a plurality of cellular phones 1000, 2000 each having a built-in battery, wherein one cellular phone 1000 has a feeding means 1800 for feeding the power to the other cellular phones 2000 and the other cellular phone 2000 has a charging means 2800 for charging the power fed from the one cellular phone 1000 into a battery 2010. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mobile phone that operates with a built-in battery, and more particularly to a technique for improving convenience when charging a built-in battery.

  In recent years, mobile phones have been equipped with various functions such as an electronic mail communication function, a TV / radio broadcast reception function, and a music data recording / playback function in addition to the voice communication function which is the original function.

  When using these functions, it is usually operated with power from a built-in battery. Therefore, it is necessary to charge the built-in battery periodically.

  However, the amount of power consumed varies depending on the type of function to be used and the frequency of use. There are cases where power is consumed unexpectedly, forgetting to charge, and going out.

  In such a case, it is almost the case that it does not have the charger for own machines, and even if it has, the external power supply is not necessarily near.

  Assuming such a case, a technology for charging from an information terminal such as a notebook computer that is often carried with a mobile phone has been developed (see Patent Document 1).

JP 2001-186676 A

  However, many mobile phone users do not always carry information terminals with them, and as mobile phones themselves become more multifunctional and sophisticated, various operations can be performed using only mobile phones. It is expected that there will be fewer opportunities to carry other information terminals together.

  Furthermore, as the functions of mobile phones diversify, running out of battery can lead to great inconveniences such as being unable to buy things or getting on a train.

  Therefore, the present invention greatly increases the chances of charging a mobile phone even if the mobile phone is about to run out of battery even if the mobile phone is not carrying an information terminal such as a laptop computer. The purpose is to provide a power transfer system.

In order to solve the above problems, the power transfer system of the present invention is a power transfer system including a first mobile phone and a second mobile phone each containing a battery, and the first mobile phone is a second mobile phone. Supplying means for supplying power to the mobile phone is provided, and the second mobile phone is provided with charging means for storing the power supplied from the first mobile phone in a battery.
Since the power transfer system according to the present invention has the above-described configuration, it can be charged from another mobile phone, so even if there is no other power source, it can be charged as long as there is another mobile phone. become able to.

  In other words, you have multiple mobile phones not only when you run out of battery but also in the event of a disaster, etc., but you want to collect power in one mobile phone in order to keep in contact with the outside This is also effective when there is no other battery that can be attached to the mobile phone.

  In addition, the first mobile phone further displays detection means for detecting a remaining power level of a built-in battery, and information on the remaining power level detected by the detection means, indicating the amount of power that the user desires to supply. Means for acquiring supply information, and determination means for determining the amount of power to be supplied based on the remaining power and the supply information, wherein the supply means is the determination means for the second mobile phone. It is good also as supplying the electric power of the determined electric energy.

  Thereby, since the user can determine the power to be supplied, it is possible to prevent inconveniences such as running out of battery in his / her mobile phone.

  It is also possible to supply all of the remaining power of the own device to the other party for reasons such as returning home immediately.

  The second mobile phone further displays detection means for detecting the remaining power of the built-in battery and information on the remaining power detected by the detection means, indicating the amount of power that the user desires to charge. Means for acquiring charging information; and a transmission means for determining a required power amount based on the remaining power and the charging information, and transmitting information representing the determined power amount to the first mobile phone, The first mobile phone includes means for receiving information transmitted by the transmission means, and the supply means supplies power of an amount of power determined based on the received information to the second mobile phone. Also good.

  As a result, the user can determine the power to be charged, so that his / her mobile phone can be charged with only the minimum necessary power.

  For example, the supplying side and the supplying side can exchange power in consideration of their future plans, so that the other party's mobile phone runs out of battery due to providing more power than necessary. Can be prevented.

  The information on the remaining power level to be displayed may be a time during which the standby state is maintained by the remaining power level detected by the detection unit.

  As a result, it is possible to know the standby time that can be maintained with the remaining amount of power, so that it is possible to easily determine the power to be supplied or supplied.

  The first mobile phone and the second mobile phone may each further have an external output terminal, and the supply means may supply power through the terminal.

  Thereby, since it can connect with a cable etc. and electric power movement can be performed, electric power can be moved now efficiently.

  The mobile phone according to the present invention is a mobile phone with a built-in battery. The mobile phone includes a detection unit that detects a remaining power level of the battery, and information on the remaining power level detected by the detection unit. Means for obtaining supply information indicating the amount of power desired to be supplied; determination means for determining the amount of power to be supplied based on the remaining power amount and the supply information; and power of the determined amount of power to the outside And means for supplying.

The mobile phone according to the present invention is a mobile phone with a built-in battery. The mobile phone includes a detection unit that detects a remaining power level of the battery, and information on the remaining power level detected by the detection unit. Based on the means for acquiring charging information indicating the amount of power desired to be charged, the remaining power level and the charging information, the amount of power to be stored is determined, and the power supplied from the outside is stored in the built-in battery. And charging means.
Thereby, the construction of the power transfer system can be easily performed.

It is a figure showing a mode that the mobile telephones were connected with the cable at the time of electric power movement system implementation. It is a functional block diagram which shows the structure of the electric power movement system which concerns on this invention. FIG. 3A is a diagram showing an example of the configuration and contents of battery information of the first mobile phone, and FIG. 3B is a diagram showing an example of a designation screen for the amount of power supplied by the first mobile phone. It is. FIG. 4A is a diagram showing an example of the configuration and contents of the battery information of the second mobile phone, and FIG. 4B is a diagram showing an example of a power amount designation screen for charging the second mobile phone. It is. It is a flowchart which shows the process of an electric power movement system.

<Overview>
The power transfer system according to the present invention is a system for exchanging power between mobile phones. In other words, this is a system in which a mobile phone that needs to be charged can receive power from another mobile phone.

  Currently, since many people carry mobile phones, if they can be charged between mobile phones, it will be possible to greatly increase the chances of being charged when the battery is about to run out.

  Further, according to the present invention, power can be exchanged by designating the amount of power supplied by the mobile phone or the amount of power desired to be supplied.

  By determining the amount of power to move, it becomes possible to prevent the batteries from running out again. In the present embodiment, a case will be described in which mobile phones are connected to each other with a cable to move power.

<Configuration>
Hereinafter, a power transfer system according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

FIG. 1 is a diagram illustrating a state in which mobile phones are connected with a cable.
Here, mobile phone 1000 and mobile phone 2000 are connected by cable 3000.

The cable 3000 is assumed to be capable of not only power transfer but also data communication.
Next, FIG. 2 is a functional block diagram showing the configuration of the power transfer system according to the present invention.
The first mobile phone 1000 includes a transmission / reception unit 1001, a microphone 1002, a speaker 1003, an incoming call notification unit 1004, a control unit 1100, an operation unit 1200, a display unit 1300, an external communication unit 1400, a battery information storage unit 1500, a power control unit 1600, It includes a remaining power detection unit 1700, a charging power generation unit 1800, a power transfer connection unit 1900, and a battery 1010.

The second mobile phone 2000 includes a transmission / reception unit 2001, a microphone 2002, a speaker 2003, an incoming call notification unit 2004, a control unit 2100, an operation unit 2200, a display unit 2300, an external communication unit 2400, a battery information storage unit 2500, and a power supply control unit. 2600, a remaining power detection unit 2700, a charging unit 2800, a power transfer connection unit 2900, and a battery 2010.
The first mobile phone 1000 and the second mobile phone 2000 have basically the same configuration, but the charging unit 2800 of the second mobile phone 2000 is different from the charging power generation unit 1800 in the first mobile phone 1000. The only difference is.

In the present embodiment, this is a difference in configuration due to the fact that the second mobile phone 2000 is the side that receives power and the first mobile phone 1000 is the side that supplies power.
It should be noted that both the first mobile phone and the second mobile phone can be used as a power supply side or a power supply side. That is, although it has both the charging part 2800 and the power supply preparation part 1800, only the function part required in order to play the role of one is described here for convenience of explanation.

  Hereinafter, each functional unit will be described. In the description, the functional units having the same functions in the first mobile phone 1000 and the second mobile phone 2000 will be described together.

  The transmission / reception units (1001, 2001) receive signals to be transmitted from the control units (1100, 2100), convert them into a predetermined form for transmission, and transmit the converted transmission signals via an antenna (not shown). And a function of performing processing such as demodulation on the signal received by the antenna and sending the signal to the control unit (1100, 2100).

  The microphones (1002, 2002) have a function of inputting external sound, and the speakers (1003, 2003) have a function of outputting sound signals.

  The incoming call notification unit (1004, 2004) has a function of notifying the user of an incoming call or the like through a ringer or a vibrator.

  The control units (1100, 2100) have a function of performing data transfer and control between the functional units. In addition, the present embodiment has a function of issuing an instruction to the power supply control unit (1600, 2600) when performing power transfer.

  The operation units (1200, 2200) are configured with buttons, keys, and the like, and have a function of receiving user instructions such as button presses and notifying the control units (1600, 2600).

  The display units (1300, 2300) are so-called displays and have a function of displaying various information such as telephone numbers and menus.

  Next, the external communication unit (1400, 2400) has a function of performing communication with other mobile phones. The communication unit does not communicate with a base station provided in a normal mobile phone. Also, it does not move power.

  Communication by the external communication unit (1400, 2400) is performed by connecting with a cable 3000 (see FIG. 1).

  The battery information storage unit (1500, 2500) has a function of recording information related to the internal battery, such as the capacity of the internal battery of the mobile phone. The recorded information will be described later with reference to FIGS.

  The remaining power detection unit (1700, 2700) has a function of detecting the remaining amount of the battery (1010, 2010).

  The power transfer connection unit (1900, 2900) has a function of exchanging power with other mobile phones. Specifically, when power is moved by a cable, it means an external terminal of the cable.

  The power control unit 1600 of the first mobile phone 1000 has functions such as determining the amount of power to be supplied and issuing an instruction to the charging power generation unit 1800.

  On the other hand, the power control unit 2600 of the second mobile phone 2000 has functions such as determining the amount of power required and issuing a charging instruction to the charging unit 2800.

  These power supply control units (1600, 2600) select the function on the power supply side or the power supply side. The side that has selected “power supply request” from the menu when starting up the power transfer system is the side to which power is supplied, in this embodiment the second mobile phone.

  The charging power generation unit 1800 of the first mobile phone 1000 has a function of using a built-in battery power source to generate power supplied by a booster circuit. In the present embodiment, the voltage of the battery 2010 of the second mobile phone 2000 is assumed to be within a certain range in advance, and the booster circuit boosts the voltage to a voltage higher than that voltage.

  The charging unit 2800 of the second mobile phone 2000 has a function of charging the battery 2010. Specifically, a charging circuit is applicable.

  Here, all or a part of each process by each unit such as the power supply control unit 1600 is realized by a CPU (not shown) executing various programs.

<Data>
Hereinafter, main data used by the power transfer system will be described with reference to FIGS. 3 and 4.

  FIG. 3A is a diagram showing an example of the configuration and contents of battery information of the first mobile phone, and FIG. 3B is a diagram showing an example of a designation screen for the amount of power supplied by the first mobile phone. It is.

First, the battery information 1510 of the first mobile phone 1000 in FIG.
The battery information 1510 is created in advance and is stored in the battery information storage unit 1500. This content differs depending on the model depending on the capacity of the built-in battery and the power consumption of the mobile phone.

  The battery information 1510 includes a remaining power 1511, an overall ratio 1512, and a standby time 1513. The remaining power 1511 represents the remaining power of the built-in battery 1010. The unit is mAh (milliampere hour). The overall ratio 1512 represents the ratio of the remaining power detected by the remaining power detection unit 1700 to the full charge, and the unit is% (percent).

  The standby time 1513 represents the length of the standby time that can be maintained with the amount of power represented by the remaining power 1511, and the unit is time. Next, the screen 1310 of the first mobile phone in FIG. The screen 1310 displays information on the remaining battery level at the current time and options 1311 of power that can be supplied. The option 1311 displays the percentage of power that can be supplied and the standby time that is possible with the amount of power remaining after the power is supplied.

  The amount of power that can be supplied in percentage is considered to be rare when the user remembers the battery capacity of the user's own device, so that the user can easily grasp the remaining amount of power. The standby time after power is supplied is to provide a guideline for selecting the amount of power to be supplied. Of course, other information may be used. One of these options is focused and selected with the enter key 1313.

  In the example, the information regarding the remaining battery level at the present time is “75% remaining amount” and “standby time 270 hours”, and the options of power that can be supplied are “25%: 180 hours”, “50%: 90 hours”. ”,“ 75%: 0 hours ”, and the user focuses on“ 50%: 90 hours ”. This indicates that if 50% of power is supplied, the standby state can be maintained for another 90 hours.

  In the present embodiment, it is assumed that the remaining power is handled by truncation. For example, when the actually detected remaining power is 650 mAh, the remaining power is displayed as 600 mAh (the same applies hereinafter). Next, FIG. 4A is a diagram showing an example of the configuration and contents of battery information of the second mobile phone, and FIG. 4B is an example of a screen for specifying the amount of power to be charged on the second mobile phone. FIG.

  The battery information 2510 of the second mobile phone 2000 in FIG. 4A is created in advance in the same manner as the battery information 1510 of the first mobile phone 1000 shown in FIG. 2500. The battery information 2510 is composed of a remaining power 2511, an overall ratio 2512, and a standby time 2513. The contents of the battery information 2510 are the remaining power 1511, the overall ratio 1512, and the standby time 1513 of the battery information 1510 (FIG. 3A). ))).

  However, the capacity of the battery 2010 of the second mobile phone 2000 is different from that of the battery 1010 of the first mobile phone 1000. The interval representing the remaining power 2511 is 200 mAh, but other intervals may be used and depend on the model. Next, the screen 2310 of the second mobile phone in FIG. 4B will be described. The screen 2310 displays information regarding the remaining battery level at the present time, supply power 2311 that the first mobile phone 1000 may supply, and post-charge information 2312 when this power is charged. .

  The user presses an OK button 2313 when requesting the supply of the supplied power 2311. In the example, information regarding the remaining amount of the battery at the present time is “remaining amount 20%”, “standby time 80 hours”, the supplied power 2311 that can be provided is “400 mAh”, and the battery after charging the supplied power The remaining amount is “60%: 240 hours”.

<Operation>
Hereinafter, operations of the first mobile phone 1000 and the second mobile phone described above will be described with reference to FIG. FIG. 5 is a flowchart showing processing of the power transfer system.
First, the user of the second mobile phone 2000 whose remaining battery level is low connects his / her second mobile phone 2000 and the first mobile phone 1000 with the cable 3000 (see FIG. 1).

  Next, the operation unit 2200 of the second mobile phone 2000 is operated to display a menu on the display which is the display unit 2300, and “power transfer system” is selected from the menu. In the present embodiment, the system is operated from a menu. However, for example, the system may be operated only by pressing a specific button or key.

  The operation unit 2200 that has detected that the “power transfer system” has been selected from the menu notifies the control unit 2100 of that fact.

  Upon receiving the notification, the control unit 2100 requests the external communication unit 2400 to connect to the first mobile phone. The external communication unit 2400 that has received the request tries to connect to the external communication unit 1400 of the first mobile phone 1000 through the cable 3000 (step S200).

  On the other hand, in the first mobile phone 1000, after being connected to the second mobile phone 1000 with the cable 3000, the “power transfer system” is selected and operated in the same manner as the second mobile phone.

  When the external communication unit 1400 detects that the connection is requested from the second mobile phone 2000, the external communication unit 1400 connects (step S100), and notifies the control unit 1100 that the connection is completed. When the external communication unit 2400 of the second mobile phone 2000 detects that the connection with the first mobile phone 1000 is completed, the external communication unit 2400 notifies the control unit 2100 to that effect. Upon receiving the notification that the connection has been completed, the control unit 2100 displays that fact on the display unit 2300, and the user who has confirmed the display that the connection has been completed selects “request for power supply” from the menu.

  The control unit 2100 that has received the message “request for power supply” from the operation unit 2200 transmits a power supply request to the first mobile phone via the external communication unit 2400 (step S210).

  The control unit 1100 of the first mobile phone that has received the power supply request via the external communication unit 1400 displays a message to that effect on the display unit 1300, and the user who has confirmed the power supply request can select “accept power supply” from the menu. Select.

  Control unit 1100 that has received the notification that “power supply approval” has been selected from operation unit 1200 transmits power supply approval to the second mobile phone via external communication unit 1400 (step S110). Thereafter, the control unit 1100 of the first mobile phone requests the power supply control unit 1600 to perform the power transfer process.

The power control unit 1600 of the first mobile phone that has received the request first requests the remaining power detection unit 1700 to detect the remaining power. The remaining power detection unit 1700 that has received the request detects the remaining power of the battery 1010 (step S120), and passes the detected remaining power to the power supply control unit 1600.
Receiving the detected remaining power level, the power supply control unit 1600 reads the battery information 1510 from the battery information storage unit 1500 and creates information on the remaining battery level and an option 1311 of the power that can be supplied (see FIG. 3B). ), A display request is made to the display unit 1300 via the control unit 1100. The display unit 1300 that has received the request displays information related to the remaining battery level (step S130).

The option 1311 displayed here displays the power that can be supplied. Therefore, when the current remaining amount is “25%”, there is only one option 1311 of “25%: 0 hours”.
The user selects one of the displayed options 1311 or cancels the power supply. To cancel, the cancel button is pressed.

  When the user of the first mobile phone, that is, the user on the power supply side cancels, the fact is notified to the user of the second mobile phone and the power transfer system is terminated.

  When the user selects one of the displayed options 1311, the selected option is notified to the power control unit 1600 from the operation unit 1200 via the control unit 1100. Receiving the notification of the selected option, the power supply control unit 1600 obtains the amount of power to be supplied from the battery information 1510 and notifies the second mobile phone 2000 (step S140). On the other hand, the control unit 2100 of the second mobile phone 2000 that has received notification from the first mobile phone 1000 that “power supply approval” has been selected requests the power supply control unit 2600 to perform power transfer processing. .

  Receiving the request, the power control unit 2600 requests the remaining power detection unit 2700 to detect the remaining power (step S220), and displays it on the display unit 2300 (step S230). At this time, the supplied power 2311 and the post-charging power 2312 on the screen 2310 (see FIG. 4B) are blank.

  After that, the control unit 2100 of the second mobile phone 2000 that has received a notification of the amount of power supplied from the first mobile phone 1000 requests the display unit 2300 to display the value on the screen 2310. Upon receiving the request, the display unit 2300 displays the supplied power 2311 on the screen 2310.

At the same time, the control unit 2100 notifies the power control unit 2600 of the received power amount.
The power supply control unit 2600 calculates the state when the notified amount of power is charged. Specifically, the information 2510 in the battery information storage unit 2500 is read, and the ratio of the remaining power after charging and the possible standby time are obtained.

  In the example, when “400 mAh” is charged, the current remaining power is “20%”, that is, “200 mAh”, and thus the remaining power after charging is “200 mAh + 400 mAh = 600 mAh”. Accordingly, the remaining power after charging is “60%”, and the possible standby time is “240 hours” (see FIG. 4A).

  In this way, by displaying the state after charging according to the performance of the battery of the own device, the user can easily determine whether or not the supplied power is sufficient.

When the user who has confirmed the state after charging determines that the amount of power is sufficient, the user presses the OK button 2313 and requests the first mobile phone 1000 to start supplying power (step S240).
If it is determined that the amount of power is insufficient or too large, a cancel button (not shown) is pressed, and the user of the first mobile phone 1000 selects the option again (FIG. 3B). reference).

  The power supply control unit 1600 of the first mobile phone 1000 that has received a request to start supplying power from the second mobile phone 2000 requests the charging power generation unit 1800 to start generating a power supply. Receiving the request, charging power generation unit 1800 boosts the voltage of its own battery 1010 and sends power to second mobile phone 2000 via power transfer connection unit 1900 and cable 3000 (step S150). That is, a voltage is applied to the terminal of the second mobile phone.

  In the second mobile phone 2000, power is stored by being applied to the terminal of the battery 2010 through the power transfer connection unit 2900 and the charging unit 2800 (step S250). The power supply control unit 1600 that has requested the power supply generation unit 1800 to supply power requests the remaining power detection unit 1700 to detect the remaining battery level at predetermined intervals (step S160). For example, the remaining power is checked at intervals of 1 second.

  The power supply control unit 1600 obtains the amount of power supplied from the remaining power detected by the remaining power detection unit 1700, and when the obtained power amount reaches the scheduled power supply amount (step S170: YES), The charging power generation unit 1800 is notified that the generation is to be stopped, the power supply is terminated, and a message indicating that the supply is terminated is displayed on the display unit 1300. In addition, the second mobile phone 2000 is notified that power supply has ended, and the power transfer system is ended (step S180).

  Receiving the notification that power supply has ended, second mobile phone 2000 displays a message indicating that charging has ended on display unit 2300, and ends the power transfer system (step S260). When the battery 2010 of the second mobile phone 1000 is fully charged, the power transfer is terminated.

<Supplement>
As mentioned above, although the electric power movement system which concerns on this invention was demonstrated based on embodiment, this system can also be modified partially and of course this invention is not restricted to the above-mentioned embodiment. That is, (1) In the embodiment, the amount of power movement is specified and the amount of power is moved. However, the side to be supplied sets the amount of power to be left, or the side to be charged is after charging. It is also possible to set the remaining amount of power and move the power.

  In this case, the remaining amount of power is detected at a predetermined time interval, and the movement of the power is stopped when the target remaining power amount is reached. (2) In the embodiment, the state in which the power is being moved is not notified, but the side that supplies power and the side that is supplied regularly communicate to update the remaining power level. Also good.

(3) In the embodiment, the power supply side is supposed to be able to supply all the power, but may be terminated when the remaining power level falls below a certain value.
(4) In the embodiment, the power transfer is performed using a cable, but may be performed wirelessly.

For example, an electromagnetic induction method is used, for example, generating an alternating magnetic field.
When power is transferred wirelessly, there is an advantage that a cable is not required. On the other hand, when power is transferred using a cable, there is an advantage that power loss is small.

  In the embodiment, communication between mobile phones is performed by connecting a cable, but may be wireless. For example, communication using Bluetooth or infrared rays may be used.

  (5) In the embodiment, the voltage of the battery on the power supply side is in a certain range in advance, but it may not be determined in advance.

  For example, information on the voltage may be transmitted from the mobile phone on the supply side to the mobile phone on the supply side, and a power supply to be supplied may be created based on the voltage information.

  (6) Although the embodiment describes power transfer between mobile phones, the present invention is not limited to this. For example, power transfer between a mobile phone and a PDA (Personal Digital Assistant), between PDAs, or between a mobile phone and a plurality of devices is also possible.

  (7) A program for causing the CPU to execute each control process (see FIG. 2 and the like) for realizing each function of the mobile phone shown in the embodiment is recorded on a recording medium or via various communication paths. It can also be distributed and distributed. Such a recording medium includes an IC card, an optical disk, a flexible disk, a ROM, a flash memory, and the like. The distributed and distributed program is used by being stored in a memory or the like that can be read by a CPU in the device, and the CPU executes the program to realize each function of the mobile phone shown in the embodiment. Is done.

It is useful as a charging method for any portable terminal that operates with a built-in battery.

1000 First mobile phone 1001, 2001 Transmission / reception unit 1002, 2002 Microphone 1003, 2003 Speaker 1004, 2004 Incoming notification unit 1010, 2010 Battery 1100, 2100 Control unit 1200, 2200 Operation unit 1300, 2300 Display unit 1310, 2310 Screen 1400, 2400 External communication unit 1500, 2500 Battery information storage unit 1510, 2510 Battery information 1600, 2600 Power supply control unit 1700, 2700 Remaining power detection unit 1800 Charging power generation unit 1900, 2900 Power transfer connection unit 2000 Second mobile phone 2800 Charging unit 3000 cables

Claims (5)

A power transfer system comprising a first mobile phone and a second mobile phone each containing a battery,
The first mobile phone comprises a supply means for supplying power to the second mobile phone,
The second mobile phone comprises a charging means for storing the power supplied from the first mobile phone in a battery,
The second mobile phone further includes detection means for detecting a remaining power of a built-in battery;
Means for displaying information on the remaining amount of power detected by the detection means, and acquiring charging information indicating an amount of power that the user desires to charge;
Based on the remaining power and the charging information, determining a requested amount of power, and transmitting means for transmitting information representing the determined amount of power to the first mobile phone,
The first mobile phone includes means for receiving information transmitted by the transmission means,
The power supply system according to claim 1, wherein the supply means supplies the second mobile phone with a power amount determined based on the received information.   2. The power transfer system according to claim 1, wherein the information related to the remaining power to be displayed is a time during which a standby state is maintained based on the remaining power detected by the detection unit. The first mobile phone and the second mobile phone each further have an external output terminal,
The power transfer system according to claim 1, wherein the supply unit supplies power through the terminal. A mobile phone with a built-in battery,
Detecting means for detecting the remaining power of the battery;
Means for displaying information on the remaining amount of power detected by the detection means, and acquiring charging information indicating an amount of power that the user desires to charge;
A mobile phone comprising: charging means for determining an amount of electric power to be stored based on the remaining electric power and the charging information, and storing electric power supplied from outside in a built-in battery. Transmission means for transmitting information representing the determined power amount to the outside,
5. The mobile phone according to claim 4, wherein the charging unit stores the power of the amount of power transmitted from the outside in a built-in battery based on the transmitted amount of power.

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