JP2010074992A - Charging system and charging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To charge a charging apparatus with an amount of power meeting user's expectation as much as possible even when the transmission efficiency of power transmission is not so good. <P>SOLUTION: When a secondary battery of first electronic equipment is charged by transmitting power from second electronic equipment, an amount of power to be supplied from the second electronic equipment is determined based on the amount of power desired by the first equipment and the transmission efficiency. Even if the transmission efficiency of a power transmission line is not good, therefore, the amount of power meeting user's expectation as much as possible is charged to the secondary battery of the first electronic equipment. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a charging system and a charging device, and more particularly to a technique suitable for use in charging performed between portable devices.

  In recent years, a charging system for charging between battery-powered portable devices such as mobile phones and digital cameras has been proposed. In such charging between portable devices, there is a limit to the amount of power that can be supplied from the supply device. Therefore, it is not always possible to charge the battery until the battery of the charging device is fully charged. Assuming such a case, before starting charging, the amount of power to be charged is determined based on the remaining battery level and the amount of power desired by the user, and the supply device supplies the determined amount of power to the charging device. Technology has been proposed (see, for example, the power transfer system described in Patent Document 1).

JP 2006-287555 A

  However, the power mobile system described in Patent Document 1 has a problem when the transmission efficiency in power transmission is poor. Transmission efficiency in charging between devices indicates the amount of power that can be charged by the charging device out of the amount of power supplied by the supplying device. In wireless charging using the electromagnetic induction method, power loss due to leakage magnetic flux, etc. Is particularly big.

  Therefore, in the related art, there is a large difference between the amount of power supplied by the supply device and the amount of power charged by the charging device, and thus there is a problem that the charging device cannot charge the amount of power expected by the user. is there.

  In view of the above-described problems, an object of the present invention is to make it possible to charge a charging device with an amount of power that is as close as possible to the amount of power expected by a user even when transmission efficiency in power transmission is poor.

  The charging system according to the present invention is a charging system that transmits power from a second electronic device to a secondary battery included in the first electronic device and charges the secondary battery, and the first electronic device includes the first electronic device. Efficiency acquisition means for acquiring transmission efficiency in power transmission performed between the second electronic device and the second electronic device, and the second electronic device based on the desired amount of power and the transmission efficiency. A transmission means for determining a required power amount and transmitting required power amount information indicating the determined required power amount to the second electronic device, and the secondary battery by the power supplied from the second electronic device. Charging means for charging, and the second electronic device comprises supply means for supplying the first electronic device with an amount of power determined based on the required power amount information transmitted by the transmitting means. It is characterized by that.

  The charging device of the present invention is a charging device that charges a secondary battery with power supplied from an external power supply device, and acquires transmission efficiency in power transmission performed with the external power supply device. Based on the efficiency acquisition means, the desired power amount and the transmission efficiency, the power amount required for the external power supply device is determined, and the required power amount information indicating the determined required power amount is set as the external power. It is characterized by comprising transmission means for transmitting to a supply device, and charging means for receiving the power supplied from the external power supply device and charging the secondary battery with the received power.

The charging method of the present invention is a charging method in which a secondary battery included in the first electronic device is charged by transmitting power from the second electronic device, and the first electronic device is the first electronic device. An efficiency acquisition step of acquiring transmission efficiency in power transmission performed between the electronic device and the second electronic device, and the second electronic device based on a desired amount of power and the transmission efficiency Determining a required power amount, transmitting a required power amount information indicating the determined required power amount to the second electronic device, and the secondary battery by using the power supplied from the second electronic device. A charging step of charging, wherein the second electronic device includes a supplying step of supplying the first electronic device with an amount of power determined based on the required power amount information transmitted in the transmitting step. It is characterized by that.
Another aspect of the charging method of the present invention is a charging method for charging a secondary battery with power supplied from an external power supply device, and is performed between the power supply device and the external power supply device. An efficiency acquisition step of acquiring the transmission efficiency in the power transmission, a power amount required for the external power supply device based on the desired power amount and the transmission efficiency, and indicating the determined required power amount A transmission step of transmitting required power amount information to the external power supply device; and a charging step of receiving the power supplied from the external power supply device and charging the secondary battery with the received power. It is characterized by.

  According to the present invention, even when the transmission efficiency is poor, it is possible to charge the charging device with an amount of power as close as possible to the amount of power expected by the user.

The best mode for carrying out the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 shows an example of a wireless charging system according to the present invention. A mobile phone (first electronic device) 1101 is configured to be able to store electric power supplied wirelessly from a digital camera (second electronic device) 2101 in a battery included in the own device.

Next, a schematic configuration of functional blocks related to charge control of the mobile phone 1101 and the digital camera 2101 will be described with reference to FIG.
A cellular phone 1101 includes a display unit 1201, an operation unit 1202, a battery remaining amount detection unit 1203, a battery 1204, a charge / discharge control unit 1205, a wireless power transmission unit 1206, a wireless communication unit 1207, a timer 1208, a control unit 1209, and a memory 1210. Composed.

  On the other hand, the digital camera 2101 includes a display unit 2201, an operation unit 2202, a remaining battery level detection unit 2203, a battery 2204, a charge / discharge control unit 2205, a wireless power transmission unit 2206, a wireless communication unit 2207, a timer 2208, a control unit 2209, a memory. 2210. As seen in FIG. 2, the mobile phone 1101 and the digital camera 2101 have the same functional block regarding charge control.

Subsequently, each functional block will be described.
The display units (1201, 2012) are displays and have a function of displaying various information to the user. For example, a determination screen for the amount of power to be charged is displayed. The operation units (1202, 2202) are configured with buttons, keys, and the like, and have a function of receiving support from the user by pressing a button and notifying the control units (1209, 2209).

  The remaining battery level detection unit (1203, 2203) has a function of detecting the remaining battery level (1204, 2204). The remaining battery level detection unit (1203, 2203) includes, for example, a diode, and grasps the remaining battery level by acquiring a voltage value corresponding to the remaining capacity of the battery (1204, 2204).

  The batteries (1204, 2204) are rechargeable secondary batteries. A battery 1204 supplies power to each part of the mobile phone 1101, and a battery 2204 supplies power to each part of the digital camera 2101.

  The charge / discharge control unit (1205, 2205) has a charge control function of storing the power input from the wireless power transmission unit (1206, 2206) in the battery (1204, 2204). Moreover, it has a discharge control function for supplying the power stored in the battery (1204, 2204) to the outside via the wireless power transmission unit (1206, 2206).

  The charge control function and the discharge control function operate exclusively, and the charge control function and the discharge control function are switched by the control unit (1209, 2209). In this embodiment, since the digital camera 2101 functions as an external power supply device that supplies power to the mobile phone 1101, the charge / discharge control unit 1205 is set to the charge control function, and the charge / discharge control unit 2205 is set to the discharge control function. It is assumed that it is set. In addition, the mobile phone 1101 is a charging device, and the control unit 1209 performs charge amount acquisition for acquiring a desired amount of power. However, the setting of the charging device and the power supply device is not limited to this, and power can be supplied from the mobile phone 1101 to the digital camera 2101 if the reverse setting is made.

  The wireless power transmission units (1206, 2206) have a function of wirelessly transmitting power. For wireless power transmission, for example, an electromagnetic induction method can be used in which a current is transmitted by an alternating magnetic field generated by flowing a current through a coil. In the wireless charging system according to this embodiment, power is transmitted from the wireless power transmission unit 2206 of the digital camera 2101 to the wireless power transmission unit 1206 of the mobile phone 1101.

  The wireless communication units (1207, 2207) have a function of communicating information wirelessly. In the present embodiment, information communication such as a power supply request and approval is performed by the wireless communication units (1207, 2207). For wireless information communication, for example, a wireless LAN such as IEEE 802.11g, Bluetooth, or the like can be used. It is also possible to transmit information by changing the strength of the magnetic field to be generated using an electromagnetic induction method. In this case, the wireless communication unit (1207, 2207) and the wireless power transmission unit (1206, 2206). Can be configured with the same hardware. The timers (1208, 2208) are hardware timers having a function of counting time.

  The control units (1209, 2209) are constituted by a CPU or the like, and are functional blocks serving as a center for controlling all the functional blocks shown in FIG. The control units (1209, 2209) include memories (1210, 2210) for storing information.

Next, a charging sequence according to the present invention will be described with reference to FIG.
First, when charging is started, the user brings the mobile phone 1101 and the digital camera 2101 close to each other. Thus, the cellular phone 1101 and the digital camera 2101 detect proximity (steps S1301 and S2301).

Proximity detection is also realized by, for example, the wireless power transmission unit (1206, 2206) including a radio wave output circuit for periodically outputting weak radio waves and a radio wave detection circuit for detecting radio wave input. it can. With this configuration, when the wireless power transmission units (1206, 2206) are brought close to each other, the proximity can be detected by detecting the weak radio waves of each other. It should be noted that the efficiency can be calculated at a timing other than the timing at which the proximity of the digital camera 2101 is detected prior to charging. However, in the case of charging using an electromagnetic induction method, the efficiency of power supply is extremely reduced if the distance between devices is too large. Therefore, for example, it can be executed when the user gives an instruction at the timing when the mobile phone 1101 and the digital camera 2101 are brought close to each other.
In addition, it is configured to authenticate whether the mobile phone 1101 and the digital camera 2101 are devices that can be charged with each other by communicating with the wireless communication units 1207 and 2207, and to detect efficiency when performing this authentication. Also good.

  In step S1301 and step S2301, simultaneously with proximity detection, a connection in the wireless communication unit (1207, 2207) is established, and the direction of power transmission is determined. In the present embodiment, information that the mobile phone 1101 is on the charging side and the digital camera 2101 is on the discharging side is shared based on the setting of the charge / discharge control unit (1205, 2205). Subsequently, after proximity detection, charging control is performed with a small amount of power for calculating the power transmission efficiency.

  Subsequently, the mobile phone 1101 transmits a small amount supply request for charging a predetermined small amount of power to the digital camera 2101 via the wireless communication unit (1207, 2207) (step S1302). The low power amount may be 10 [mAh], for example. This request is not intended for charging but for the purpose of acquiring the efficiency on the transmission line, and therefore, the minimum amount of power required for efficiency calculation is desirable as the small amount of power.

  Upon receiving the power supply request, the digital camera 2101 transmits an acknowledgment response to the mobile phone 1101 in step S2302 if power can be supplied. Although not shown in the figure, the charging sequence may be interrupted by issuing a warning or the like when power supply is impossible due to, for example, low power stored in the battery 2204 of the digital camera 2101. .

  After transmitting the acknowledgment response, the charge / discharge control unit 2205 of the digital camera 2101 starts discharging from the battery 2204 and starts power supply via the wireless power transmission unit 2206 (step S2303). On the other hand, the charge / discharge control unit 1205 of the mobile phone 1101 charges the battery 1204 with the power input via the wireless power transmission unit 1206 (step S1303).

  In step S <b> 2304, the charge / discharge control unit 2205 of the digital camera 2101 determines whether the scheduled power amount has been supplied. If the result of this determination is that the amount of power requested in step S1302 has not been discharged from the battery 2204, the flow returns to step S2303 to continue supplying power. Also, as a result of the determination in step S2304, when the supply of the scheduled power amount is completed, the process proceeds to step S2305 to end the power supply, and a supply end notification is transmitted to the mobile phone 1101.

  The mobile phone 1101 that has received the supply end notification ends the charging of the battery 1204 in the charge / discharge control unit 1205 (step S1304). Subsequently, the control unit 1209 of the mobile phone 1101 calculates transmission efficiency and obtains efficiency (step S1305). The transmission efficiency is calculated by dividing the amount of power actually charged in the battery 1204 of the mobile phone 1101 by the amount of power discharged from the battery 2204 of the digital camera 2101. The former amount of power (the amount of power actually charged) is obtained by detecting the remaining battery level before and after charging by the remaining battery level detection unit 1203 and calculating the difference. The latter amount of electric power (discharged electric energy) is a small amount of electric power requested to supply electric power in step S1302.

  The control unit 1209 stores the transmission efficiency calculated by performing the above-described calculation in the memory 1210. Subsequently, the mobile phone 1101 starts charging control for the purpose of storing electric power in the battery 1204.

  In step S1306, the mobile phone 1101 first determines again the amount of power supplied from the digital camera 2101 based on the transmission efficiency and the desired amount of power. Then, a supply request for transmitting the determined supply power amount information to the digital camera 2101 is made. As an embodiment for determining the amount of power to be charged, for example, a screen for acquiring the amount of charge is displayed on the display unit 1201, and the user manually inputs the amount of power using the operation unit 1202 such as a button. It is possible to decide by Alternatively, a fixed amount set in advance on the menu screen by the user can be used.

  Subsequently, the control unit 1209 calculates a required power amount for requesting supply based on the power amount determined in step S1306 and the transmission efficiency information calculated in step S1305. Then, the required power amount information is transmitted to the digital camera 2101 together with the calculated required power amount (step S1307).

  The calculation method for the amount of power required for supply is (100 × A) / B, where A [mAh] is the amount of power required for charging and B [%] is the transmission efficiency. For example, when the amount of power required for charging is 120 [mAh] and the transmission efficiency is 60 [%], the amount of power required for supply to the digital camera 2101 is 200 [mAh].

  The digital camera 2101 that has received the power supply request from the mobile phone 1101 transmits an acknowledgment response to the mobile phone 1101 in step S2306 if it can supply the requested amount of power. Here, for example, if the power cannot be supplied due to low power of the battery 2204 of the digital camera 2101, a charging sequence may be interrupted by issuing a warning or the like.

  After transmitting the acknowledgment response, the charge / discharge control unit 2205 of the digital camera 2101 starts discharging from the battery 2204 and starts power supply via the wireless power transmission unit 2206 (step S2307). On the other hand, the charge / discharge control unit 1205 of the mobile phone 1101 charges the battery 1204 with the power input via the wireless power transmission unit 1206 (step S1308).

  In step S2308, the charge / discharge control unit 2205 of the digital camera 2101 determines whether or not the scheduled power amount has been supplied. As a result of the determination, if the amount of power requested in step S1307 has not been discharged from the battery 2204, the process returns to step S2307 to continue supplying power. Further, when the supply of the scheduled power amount is completed as a result of the determination in step S2308, the process proceeds to step S2309 to end the power supply, and a supply end notification is transmitted to the mobile phone 1101. When the battery 2204 finishes discharging the amount of power requested in step S1307, the power supply is terminated and a supply end notification is transmitted to the mobile phone 1101 (step S2309).

  The mobile phone 1101 that has received the supply end notification ends the charging of the battery 1204 in the charge / discharge control unit 1205 (step S1309).

  As described above with reference to FIG. 3, the supply side is requested for the amount of power obtained by adding the amount of power loss in the transmission path to the desired amount of power. As a result, even if a loss occurs during power transmission, the mobile phone 1101 can be charged with an amount of power that is as close as possible to the desired amount of power.

  In the present embodiment, the transmission efficiency is acquired immediately after proximity detection, but the timing for acquiring the transmission efficiency is not limited to this. For example, a predetermined timing may be used when the user presses a button.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.
In the first embodiment described above, the charging sequence based on the premise that the transmission efficiency when the transmission efficiency is calculated and the transmission efficiency when charging is the same has been described. On the other hand, in the second embodiment, the desired amount of power is appropriately charged even when the transmission efficiency changes between when the transmission efficiency is calculated and when charging is performed. An embodiment for this will be described.

  The configuration of the wireless charging system and the functional blocks of the mobile phone 1101 and the digital camera 2101 are the same as the wireless charging system and the functional block configuration described with reference to FIGS. 1 and 2 in the first embodiment. I will omit the explanation. The charging sequence is also the same sequence up to step S2306 of the charging sequence described in FIG. 3 in the first embodiment, and the description is omitted.

The processing flow after step S2307 in FIG. 3, that is, after the power supply from the digital camera 2101 is started will be described with reference to the flowcharts in FIGS.
First, the processing flow of the mobile phone 1101 on the charging side will be described with reference to FIG.

  When power supply from the digital camera 2101 is started, the increase in the remaining battery level detected by the remaining battery level detection unit 1203 is compared with the desired power amount, and whether or not the desired power amount has been charged. Is determined (step S1401).

  If it is determined in step S1401 that the desired amount of power has been charged, the process advances to step S1402 to determine whether power supply from the digital camera 2101 has been completed.

  The digital camera 2101 according to the present embodiment is configured to calculate the decrease in the remaining battery level detected by the remaining battery level detection unit 2203 and the amount of power requested from the mobile phone 1101 while supplying power to the mobile phone 1101. Compare. Then, when it is determined that they are the same, the charge / discharge control unit 2205 ends the power supply and transmits a supply end notification to the mobile phone 1101 via the wireless communication unit 2207. In step S1402, it is determined whether power supply from the digital camera 2101 has been completed based on whether the above-described supply end notification has been received.

  As a result of the determination in step S1402, if it is determined that the power supply has been completed, the charging is terminated. On the other hand, as a result of the determination in step S1402, if it is determined that the power supply has not ended, the process proceeds to step S1403. In step S1403, in order to prevent the digital camera 2101 from supplying excessive power, a power supply stop request is sent to the digital camera 2101 via the wireless communication unit 1207, and charging is terminated.

  On the other hand, as a result of the determination in step S1401, if it is determined that the desired amount of power is not yet charged, the process proceeds to step S1404. In step S1404, the amount of power charged in the battery 1204 again determines the amount of power supplied from the digital camera 2101 based on the amount of charge acquired in step S1306 and the transmission efficiency acquired in step S1305. . Then, a supply re-request for transmitting the determined supply power amount to the digital camera 2101 is performed.

  As a result of the determination in step S1404, if it is determined that the power supply has not ended, the process returns to step S1401 and charging is continued. On the other hand, if it is determined as a result of the determination in step S1404 that the power supply has been completed, the process proceeds to step S1405 to recalculate the transmission efficiency. Here, the transmission efficiency is calculated from step S2307 in FIG. 3, that is, by dividing the amount of power charged in the battery 1204 after the power supply from the digital camera 2101 is started, by the desired amount of power determined in step S1306. To do.

  Subsequently, the mobile phone 1101 calculates the remaining amount of the desired power amount, which is the difference between the desired power amount determined in step S1306 and the power amount charged up to step S1405, as a new desired power amount. Then, based on the new desired power amount and the transmission efficiency information calculated in step S1405, the amount of power required for supply is calculated, and the power supply request is transmitted to the digital camera 2101 together with the calculated power amount (step S1406). ).

  For example, if a transmission efficiency of 60 [%] is acquired in step S1305 and the desired power amount is 120 [mAh] in step S1306, the power amount requested to be supplied in step S1307 is 200 [mAh].

  Thereafter, when it is determined in step S1404 that the power supply has been terminated, if the charged power amount is 100 [mAh] and the remaining 20 [mAh] is not charged, the transmission efficiency reacquired in step S1405 Becomes “100 ÷ 200 = 50 [%]”. Then, the amount of power re-requested in step S1406 is “20 [mAh] ÷ 0.5 = 40 [mAh]”. As described above, a re-request for power supply is made.

  Subsequently, in step S1407, when the digital camera 2101 that has received the power supply request from the mobile phone 1101 can supply power, the digital camera 2101 transmits an acknowledgment response to the mobile phone 1101 to start power supply. Start charging. Then, the process returns to step S1401.

  Note that the determination method of whether or not the power supply performed in step S1402 and step S1404 has ended is based on whether or not the supply end notification from the digital camera 2101 has been received. is not. For example, a method may be used in which a timer 1208 is used to determine the end of supply when a certain period of time has elapsed since the wireless power transmission unit 1206 no longer detects power supply.

Next, the processing flow of the digital camera 2101 on the power supply side will be described with reference to the flowchart of FIG.
When the digital camera 2101 starts power supply, in step S2501, the digital camera 2101 periodically compares the amount of decrease in the remaining battery level detected by the remaining battery level detection unit 2203 with the amount of power requested from the mobile phone 1101, and requests the request. It is determined whether the supplied amount of power has been supplied.

  If the requested amount of power is supplied as a result of the determination in step S2501, the process proceeds to step S2502, a supply end notification is transmitted to the mobile phone 1101 via the wireless communication unit 2207, and power is supplied under the control of the charge / discharge control unit 2205. Exit.

  On the other hand, if it is determined in step S2501 that the requested amount of power has not been supplied, the process advances to step S2503 to determine whether a power supply stop request is sent from the mobile phone 1101. Since the power supply stop request has already been described in step S1403, the details are omitted.

  If it is determined in step S2503 that a power supply stop request has been sent, the process proceeds to step S2502, a supply end notification is transmitted to the mobile phone 1101 via the wireless communication unit 2207, and the power supply is ended. On the other hand, if the result of determination in step S2503 is that a power supply stop request has not been sent, the process returns to step S2501 to continue power supply.

  As described above, according to the processing flow described with reference to FIGS. 4 and 5, even when the transmission efficiency changes between when the transmission efficiency is acquired and when the charging is performed, the power supply is performed according to the state. It is possible to control the end of charging. As a result, excessive power supply or shortage of power supply can be prevented, so that it is possible to charge the power amount as close as possible to the desired power amount.

(Other embodiments according to the present invention)
Each means constituting the charging system in the above-described embodiment of the present invention can be realized by operating a program stored in a RAM or ROM of a computer. This program and a computer-readable recording medium recording the program are included in the present invention.

  In addition, the present invention can be implemented as, for example, a system, apparatus, method, program, storage medium, or the like. Specifically, the present invention may be applied to a system including a plurality of devices. The present invention may be applied to an apparatus composed of a single device.

  In the present invention, a software program (in the embodiment, a program corresponding to the flowcharts shown in FIGS. 3, 4, and 5) that executes each step in the above-described charging method is directly or remotely transmitted to the system or apparatus. Supply. In addition, this includes a case where the system or the computer of the apparatus is also achieved by reading and executing the supplied program code.

  Accordingly, since the functions of the present invention are implemented by computer, the program code installed in the computer also implements the present invention. In other words, the present invention includes a computer program itself for realizing the functional processing of the present invention.

  In that case, as long as it has the function of a program, it may be in the form of object code, a program executed by an interpreter, script data supplied to the OS, and the like.

  Various recording media can be used as a recording medium for supplying the program. For example, floppy (registered trademark) disk, hard disk, optical disk, magneto-optical disk, MO, CD-ROM, CD-R, CD-RW, magnetic tape, nonvolatile memory card, ROM, DVD (DVD-ROM, DVD- R).

  As another program supply method, a browser on a client computer is used to connect to an Internet home page. The computer program itself of the present invention or a compressed file including an automatic installation function can be downloaded from the homepage by downloading it to a recording medium such as a hard disk.

  It can also be realized by dividing the program code constituting the program of the present invention into a plurality of files and downloading each file from a different homepage. That is, a WWW server that allows a plurality of users to download a program file for realizing the functional processing of the present invention on a computer is also included in the present invention.

  In addition, the program of the present invention is encrypted, stored in a storage medium such as a CD-ROM, distributed to users, and key information for decryption is downloaded from a homepage via the Internet to users who have cleared predetermined conditions. Let It is also possible to execute the encrypted program by using the key information and install the program on a computer.

  In addition to the functions of the above-described embodiments being realized by the computer executing the read program, the OS running on the computer may perform part or all of the actual processing. The functions of the above-described embodiments can be realized.

  Further, the program read from the recording medium is written in a memory provided in a function expansion board inserted into the computer or a function expansion unit connected to the computer. Thereafter, the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the instructions of the program, and the functions of the above-described embodiments are realized by the processing.

It is a figure which shows embodiment of this invention and shows an example of a wireless charging system. It is a figure which shows embodiment of this invention and shows schematic structure of the functional block in connection with charge control of a mobile telephone and a digital camera. It is a flowchart which shows the 1st Embodiment of this invention and shows a charge sequence. It is a flowchart which shows the 2nd Embodiment of this invention and demonstrates an example of the process sequence of a mobile telephone. It is a flowchart which shows the 2nd Embodiment of this invention and demonstrates an example of the process sequence of a digital camera.

Explanation of symbols

1101 Cellular phone 1201 Display unit 1202 Operation unit 1203 Battery remaining amount detection unit 1204 Battery 1205 Charge / discharge control unit 1206 Wireless power transmission unit 1207 Wireless communication unit 1208 Timer 1209 Control unit 1210 Memory 2101 Digital camera 2201 Display unit 2202 Operation unit 2203 Battery remaining Quantity detection unit 2204 Battery 2205 Charge / discharge control unit 2206 Wireless power transmission unit 2207 Wireless communication unit 2208 Timer 2209 Control unit 2210 Memory

Claims (14)

A charging system that transmits power from a second electronic device to a secondary battery included in the first electronic device and charges the secondary battery,
The first electronic device includes an efficiency acquisition means for acquiring transmission efficiency in power transmission performed between the first electronic device and the second electronic device, a desired power amount, and the transmission efficiency. A transmission unit configured to determine an amount of power required for the second electronic device based on the request, and to transmit the requested power amount information indicating the determined requested power amount to the second electronic device; and the second electronic device Charging means for charging the secondary battery with electric power supplied from
The charging system according to claim 1, wherein the second electronic device includes a supply unit that supplies the first electronic device with an amount of power determined based on the required power amount information transmitted by the transmission unit.   The said efficiency acquisition means calculates the said transmission efficiency based on the amount of electric power requested | required by the said transmission means, and the electric energy supplied from the said 2nd electronic device, The said transmission efficiency is characterized by the above-mentioned. Charging system.   The first electronic device requests a predetermined power amount at a predetermined timing prior to the determination of the required power amount, and is supplied from the second electronic device in response to the request for the predetermined power amount. The charging system according to claim 1, wherein the transmission efficiency is calculated based on an electric energy and the predetermined electric energy.   When the first electronic device detects that the amount of power charged in the secondary battery does not reach a desired amount of power after starting charging by the charging unit, the transmitting unit On the basis of the amount of power to be transmitted and the transmission efficiency, the amount of power required for the second electronic device is determined again, and requested power amount information indicating the determined required amount of power is transmitted to the second electronic device. The charging system according to any one of claims 1 to 3, wherein: When the first electronic device detects that the amount of power charged in the secondary battery does not reach a desired amount of power after starting charging by the charging means, the first electronic device stops power supply. A transmission means for requesting the second electronic device;
4. The charging system according to claim 1, wherein the second electronic device stops power supply based on a stop request from the transmission unit. 5.   The charging system according to claim 1, wherein the second electronic device supplies power wirelessly. A charging device that charges a secondary battery with power supplied from an external power supply device,
Efficiency acquisition means for acquiring transmission efficiency in power transmission performed between the external power supply devices;
Based on the desired power amount and the transmission efficiency, the power amount required for the external power supply device is determined, and the required power amount information indicating the determined required power amount is transmitted to the external power supply device. A transmission means;
A charging device comprising: charging means for receiving power supplied from the external power supply device and charging the secondary battery with the received power.   The said efficiency acquisition means calculates the said transmission efficiency based on the amount of electric power requested | required by the said transmission means, and the electric energy supplied from the said external power supply apparatus, The said transmission efficiency is characterized by the above-mentioned. Charging equipment.   The efficiency acquisition means requests a predetermined power amount at a predetermined timing prior to the determination of the required power amount, and the power amount supplied from the external power supply device in response to the request for the predetermined power amount The charging device according to claim 7, wherein the transmission efficiency is calculated on the basis of the predetermined amount of power.   When it is detected that the amount of power charged in the secondary battery does not reach the desired amount of power after starting charging by the charging unit, the transmitting unit includes the desired amount of power and the transmission efficiency. The power amount requested to the external power supply device is determined again based on the information, and requested power amount information indicating the determined required power amount is transmitted to the external power supply device. The charging device according to any one of 7 to 9.   After starting charging by the charging means, if it is detected that the amount of power charged in the secondary battery has reached the desired amount of power, the transmitting means stops power supply The charging device according to any one of claims 7 to 9, wherein the information is transmitted to the external power supply device.   The charging device according to any one of claims 7 to 11, wherein the charging unit charges the secondary battery with power supplied wirelessly from the external power supply device. A charging method for transmitting and charging power from a second electronic device to a secondary battery included in the first electronic device,
The first electronic device includes an efficiency acquisition step of acquiring transmission efficiency in power transmission performed between the first electronic device and the second electronic device, a desired power amount, and the transmission efficiency. A transmission step for determining the amount of power required for the second electronic device based on the information, and transmitting the requested power amount information indicating the determined required power amount to the second electronic device; and the second electronic device. A charging step of charging the secondary battery with electric power supplied from
The charging method, wherein the second electronic device includes a supply step of supplying the first electronic device with an amount of power determined based on the required power amount information transmitted in the transmission step. A charging method for charging a secondary battery with power supplied from an external power supply device,
An efficiency acquisition step of acquiring transmission efficiency in power transmission performed with the external power supply device;
Based on the desired power amount and the transmission efficiency, the power amount required for the external power supply device is determined, and the required power amount information indicating the determined required power amount is transmitted to the external power supply device. Sending process;
A charging method comprising: a charging step of receiving power supplied from the external power supply device and charging the secondary battery with the received power.

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