WO2016107604A1 - Charging apparatus and charging method - Google Patents

Abstract

Provided is a charging apparatus, comprising a charging terminal. A built-in power supply, a current/voltage conversion device, a controller and one or more charging ports are provided in the charging terminal. The built-in power supply is connected to the current/voltage conversion device, the current/voltage conversion device is connected to the controller, and the controller is connected to the one or more charging ports.

Description

Charging device and charging method Technical field

The present invention relates to a charging device, and more particularly to an apparatus for charging a portable terminal such as a mobile phone.

Background technique

With the development of technology and the advancement of society, more and more electronic products appear on the market, such as mobile phones and tablet computers. However, in the process of using these devices in public, they often plague users due to lack of electricity. However, charging devices provided in most public places often require payment to be used, so this brings great inconvenience to people's use.

Summary of the invention

The present invention provides a charging device that is convenient for a user to use in a public place.

According to an aspect of the present invention, a charging apparatus is provided, including a charging terminal, in which a built-in power source, a current/voltage conversion device, a controller, and one or more charging ports are provided, the charging port being externally Device connection,

The built-in power source is coupled to a current/voltage conversion device that is coupled to a controller that is coupled to the one or more charging ports.

According to another aspect of the present invention, the charging apparatus further includes a two-dimensional code controller and a display, the two-dimensional code controller generating a two-dimensional code separately or under the control of the controller and generating the two-dimensional code The code is displayed on the display.

According to another aspect of the invention, the two-dimensional code is encoded with predefined information including advertisements, websites, audio, video, links, and charging information.

According to another aspect of the present invention, the controller includes a switching circuit corresponding to the one or more charging ports, and when the controller receives the external device from the charging port, the two-dimensional execution is performed The controller controls the switching circuit corresponding to the charging port to be turned on during operation of the code definition.

According to another aspect of the invention, the controller is configured to monitor a remaining of the built-in power source The charge and/or charge current is controlled and the charge is controlled based on the remaining charge and/or charge current.

According to another aspect of the present invention, the controller is configured to: when the remaining amount of power is lower than a first threshold, the controller stops charging all external devices, or the controller independently controls and time-slices Charging of one or more external devices connected.

According to another aspect of the present invention, the controller is configured to control the number of external devices that simultaneously perform charging when it is monitored that the remaining amount of the built-in power source is lower than the third threshold.

According to another aspect of the present invention, the current/voltage conversion device converts a current/voltage from a built-in power source in accordance with a current/voltage required by an external device connected through the one or more charging ports.

In accordance with another aspect of the invention, the one or more charging ports include one or more data lines or one or more USB interfaces, a Lightning interface, or a micro USB interface.

According to another aspect of the present invention, the charging terminal further includes a WIFI connector connected between the current/voltage conversion device and the controller.

According to another aspect of the present invention, the charging terminal further includes built-in storage connected between the WIFI connector and the controller.

According to another aspect of the present invention, a battery slot is connected to the built-in power source, and a battery pack is disposed in the battery slot.

The present invention also provides a method of charging using the charging device of the present invention, the method comprising the steps of:

Receiving a signal that the charging device performs a predetermined operation;

Turning on the charging operation of the charging device.

According to another aspect of the present invention, the receiving step includes accepting a signal that the charging device scans the two-dimensional code and performs a two-dimensional code specifying operation.

According to another aspect of the present invention, the operation includes accessing a web page, viewing an advertisement, a video, and paying for one or more of the fees.

According to another aspect of the invention, the remaining power and/or charging current of the built-in power source is monitored and charging is controlled based on the remaining power and/or charging current.

According to another aspect of the present invention, the method further includes: stopping charging of all external devices when the remaining amount of power is lower than the first threshold, or independently controlling charging of the connected one or more external devices in time slices.

According to another aspect of the present invention, the method further includes: when the remaining power of the built-in power source is monitored is lower than At the third threshold, the number of external devices that simultaneously charge is controlled.

According to the present invention, the charging device of the present invention has a function of charging the portable terminal by the built-in power supply and the data line, and the charging device of the present invention can control the entire charging terminal by the set two-dimensional code controller and controller The charging device of the present invention can be ensured to be suitable for charging a portable terminal having various needs by the provided current/voltage conversion device.

DRAWINGS

1 is a block diagram of a charging apparatus in accordance with a first exemplary embodiment of the present invention;

2 is a block diagram of a charging device in accordance with a second exemplary embodiment of the present invention;

FIG. 3 is a block diagram of a charging apparatus in accordance with a third exemplary embodiment of the present invention; FIG.

4 is a block diagram of a charging device in accordance with a fourth exemplary embodiment of the present invention;

Figure 5 is a flow chart of a charging method in accordance with the present invention.

detailed description

Embodiments of the present invention will now be described in detail, examples of which are illustrated in the accompanying drawings, in which The embodiments are described below to explain the present invention by referring to the figures.

1 is a block diagram of a charging device in accordance with a first exemplary embodiment of the present invention.

As shown in FIG. 1, a charging apparatus according to a first exemplary embodiment of the present invention includes a charging terminal 1 in which a built-in power source 2, a current/voltage conversion device 3, and a controller 4 are disposed. The charging device also includes one or more interfaces 5, such as one or a data interface or one or more data lines 5 for connecting external devices. The following describes the data line 5 as an example. The following description is equally applicable to the case of the data interface. The data line 5 can have various data interfaces such as a USB interface, a Lightning interface, a micro USB interface, and the like. And the charging device may further comprise a two-dimensional code controller 6, and the two-dimensional code controller 6 may be connected to a display screen (not separately shown) to display the generated two-dimensional code on the display screen for scanning or reading. take. The controller 4 can also be connected to the display screen to display various types of control information thereon. The controller 4 controls the operation of the charging device (charging terminal 1), and optionally, it can also have a function of data management.

The built-in power supply 2 is connected to a current/voltage conversion device 3, the current/voltage conversion device 3 is connected to a controller 4, the controller 4 is connected to a number of data lines 5, and the controller 4 is optionally The two-dimensional code controller 6 is connected. The QR code controller may also not be connected to the controller It is also within the scope of the invention to work independently.

The built-in power source 2 may include a battery slot in which a rechargeable battery pack is disposed as a power source.

The voltage provided by the built-in power source 2 may be a 12V weak electric voltage. Those skilled in the art will appreciate that the built-in power supply 2 can also provide voltages of other specifications.

Before charging an external device (eg, a mobile phone) using the charging device according to the first exemplary embodiment of the present invention, the charging device can be connected to an external 220V AC/DC power source to charge the charging device, thereby enabling The built-in power source 2 of the charging device stores electrical energy. Of course, those skilled in the art can also conceive that the charging device of the present invention is fixedly connected with an external AC power source (for example, a 220V civil power source) to charge other external devices.

The current/voltage conversion device 3 can be used to convert the current/voltage according to the current/voltage specification requirements of the portable device to be connected to output a charging current/voltage suitable for the portable device, preventing the current/voltage from being too small to be properly charged, At the same time, it avoids damage to portable equipment caused by excessive current/voltage.

The controller 4 includes internal circuits, not shown, such as switching circuits, the number of switches corresponding, for example, to the number of data lines 5, i.e., each switch is connected to a data line 5. As an example, when the internal circuit is closed, the corresponding data line 5 is energized to begin charging the portable device connected to the data line 5.

The two-dimensional code controller 6 can generate a two-dimensional code independently or under the control of the controller 4 and display the generated two-dimensional code on a connected display screen (not shown), for example, a portable terminal of the mobile phone is required The two-dimensional code generated by the two-dimensional code controller 6 can be scanned during charging, and then the mobile phone sends a signal to the controller 4 through the data line 5, indicating that the mobile phone scans the two-dimensional code generated by the two-dimensional code controller 6 for control. The internal circuit/switch circuit of the charging terminal 1 is controlled to be closed, and the current/voltage conversion device 3 can switch the current/voltage output from the built-in power source 2 in accordance with the current/voltage required by the portable terminal, thereby starting charging.

According to a variant, the two-dimensional code generated by the two-dimensional code controller 6 can encode pre-set content, for example, can push certain content (such as information or advertisements) to the user's mobile phone, or access the network on the user's mobile phone. Software (such as a web browser) is directed to a specific web address (such as the address of the charging terminal manufacturer, the sponsor's website, etc.), or plays video and/or audio on the user's mobile phone, and performs the specified on the user's mobile phone. After operating the content (such as browsing advertisements, videos, etc.), the mobile phone sends a signal to the controller 4 through the data line 5 to turn on the internal power of the charging terminal 1. Road, so start charging. According to another example, the two-dimensional code generated by the two-dimensional code controller 6 may also include payment information or links. The user enters the payment interface by scanning the two-dimensional code, for example, and obtains a charging time of a certain duration by paying a certain fee. In this case, the mobile phone (or other portable device) transmits the payment information to the controller 4 through the data line 5, and the controller 4 controls the closing time of the internal circuit/switch circuit corresponding to the data line 5 to control the mobile phone (or Charging time for other portable devices).

In the specific use, the user can scan the two-dimensional code controller 6 on the charging terminal 1 when the power of the mobile phone is insufficient, and the controller 4 receives the confirmation information from the mobile phone that performs the specific operation while making the charging terminal 1 The circuit is turned on, thereby ensuring that the data line 5 is charged, so that the mobile phone can be charged, and the current/voltage conversion device 3 can automatically provide a suitable voltage value according to the charged mobile phone. The specific operations include, but are not limited to, scanning a two-dimensional code generated by the two-dimensional code controller 6; accessing a specified page; browsing an advertisement; paying a fee, and the like.

In the first exemplary embodiment, the charging terminal 1 is connected to the mobile phone via the data line 5. This is merely an exemplary embodiment of the present invention, and the present invention is not limited thereto. With the same principle, the charging terminal 1 can wirelessly charge the mobile phone, for example, after the mobile phone scans the two-dimensional code from the two-dimensional code controller 6 and/or after performing the operation specified by the two-dimensional code, by wireless connection. The acknowledgment signal and related information for performing the specific operation are transmitted to the controller 4, thereby starting the wireless charging process, and these variations are all within the scope of the present invention. In the first exemplary embodiment, a mobile phone is taken as an example. The charging terminal 1 of the present invention can obviously also be used for charging other portable devices, such as ipod, itouch, ipad, pad, personal digital assistant and the like.

According to a variant of the first exemplary embodiment, the controller 4 of the charging terminal 1 may further have a power monitoring function that can monitor the remaining power of the built-in power source 2, and based on the detected remaining power amount, according to a predefined charging strategy Controls the charging of external devices.

For example, when the controller 4 monitors that the remaining power of the built-in power source 2 is lower than the first threshold, the controller 4 may control to display "the battery is too low" on the display of the two-dimensional code controller, or stop the control in the two-dimensional code. The QR code is displayed on the display of the device, indicating that the charging service is not available at this time. At this time, even if a new portable device is plugged into one of the data lines 5, charging does not start. The first threshold may be set according to parameters such as the type, material, and power supply capacity of the built-in power source 2. According to a variant, if two or more external devices are currently connected, the controller 4 can control the charging connection of the external device in which the higher battery is disconnected, or can independently control the charging of the plurality of external devices in time segments. For example, in the first time slice, only the first external device is charged and the rest is disconnected. During the charging process of the external device, in the second time slice, only the second external device is charged to disconnect the charging process of the remaining external devices. When the amount of built-in power source 2 is extremely low (eg, below a second threshold), the charging process of all charging devices can be stopped. In this way, damage to the built-in power source 2 due to excessive discharge of the built-in power source 2 can be avoided.

When it is monitored that the remaining amount of the built-in power source 2 is lower than the third threshold, the controller can control the number of external devices that are simultaneously charged. For example, when it is monitored that the remaining power of the built-in power source 2 is lower than the third threshold, the controller 4 can detect the number of external devices currently being charged, and determine whether the charging terminal 1 can simultaneously perform the new external device according to a preset algorithm. Charging. If possible, a two-dimensional code is displayed on the display of the two-dimensional code controller for scanning and charging. Otherwise, for example, the information that the device has reached the maximum charging capability can be displayed on the display of the two-dimensional code controller, or the two-dimensional code is stopped on the display of the two-dimensional code controller to indicate that the device has reached the maximum charging. Ability to no longer accept new external devices for charging.

The control condition of the controller 4 is not limited to the remaining power of the built-in power source 2, and for example, it is also possible to detect whether the sum of the current charging currents of the charging terminal 1 is lower than a preset current threshold.

With the above technical solution of the charging device of the first exemplary embodiment of the present invention, the charging device of the present invention has a charging function through the built-in power supply and the data line, and the set current/voltage conversion device is more suitable for each The demand for mobile phone charging, the set QR code controller and controller play a more control role for the entire charging terminal.

2 is a block diagram of a charging device in accordance with a second exemplary embodiment of the present invention. The second exemplary embodiment is the first exemplary embodiment. Only the differences from the first embodiment will be described below. The same frame marks indicate the same or similar functional components.

As shown in FIG. 2, a charging apparatus according to a second exemplary embodiment of the present invention includes a charging terminal 1 in which a built-in power source 2, a current/voltage conversion device 3, and a controller 4 are disposed. Furthermore, the charging terminal 1 further comprises a WIFI connector 7, and the charging device further comprises one or more USB interfaces 5.

The built-in power source 2 is connected to a current/voltage conversion device 3, the current/voltage conversion device 3 is connected to a WIFI connector 7, the WIFI connector 7 is connected to a controller 4, and the controller 4 is connected to one or more A USB interface 5 is connected.

The current/voltage conversion device 3 can be used to convert the current/voltage according to the current/voltage requirements of the portable device to be connected to output a current/voltage suitable for the portable device.

The WIFI connector 7 provides a WIFI connection for the user, so that the user can bring data interaction function when using, and the controller manages and controls the signal during signal and transmission.

A battery slot can be connected to the built-in power source 2, and a battery pack is disposed in the battery slot.

Wherein, the voltage provided by the built-in power source 2 is a 12V weak electric voltage.

Before charging the mobile phone using the charging device according to the second exemplary embodiment of the present invention, the charging device may be connected to an external 220V DC power source to charge the charging device, thereby enabling the built-in power source 2 of the charging device Stores electrical energy.

Although the two-dimensional code controller is not shown in Fig. 2, the charging apparatus of the second embodiment may also include a two-dimensional code controller which is connected to the controller 4 and operates in a similar manner to the first embodiment. For example, after the external mobile phone scans the two-dimensional code generated by the two-dimensional code controller, the controller 4 can control the start of charging while providing the wifi function.

With the above technical solution of the charging device of the second exemplary embodiment of the present invention, the charging device of the present invention has a charging function by the built-in power source and the USB interface, and the set WIFI connector functions as a data interaction, and The set controller also plays a role in controlling the entire charging device.

FIG. 3 is a block diagram of a charging apparatus in accordance with a third exemplary embodiment of the present invention.

As shown in FIG. 3, a charging apparatus according to a third exemplary embodiment of the present invention includes a charging terminal 1 in which a built-in power source 2, a current/voltage conversion device 3, and a controller 4 are disposed. The charging device further includes a WIFI connector 7 and built-in storage 8 (eg, a hard disk, a flash memory, etc.), and the charging device further includes one or more USB interfaces 5.

The built-in power supply 2 is connected to a current/voltage conversion device 3, the current/voltage conversion device 3 is connected to a WIFI connector 7, and the WIFI connector 7 is connected to a built-in storage 8, the built-in storage 8 and the controller 4 Connected, the controller 4 is connected to one or more USB interfaces 5.

The current/voltage conversion device 3 can be used to convert the current/voltage according to the current/voltage requirements of the portable device to be connected to output a current/voltage suitable for the portable device.

The WIFI connector 7 provides a WIFI connection for the user, so that the user can bring data interaction function when using.

The built-in storage 8 is used to provide a data storage transmission function for a portable device such as a mobile phone, that is, the problem that the portable device occupies its own memory when browsing a webpage.

The controller 4 is used to control the data transfer function in the built-in memory 8.

A battery slot can be connected to the built-in power source 2, and a battery pack is disposed in the battery slot.

Wherein, the voltage provided by the built-in power source 2 is a 12V weak electric voltage.

The capacity of the built-in storage 8 can be set as needed.

In the specific use, people can charge the mobile phone through the USB interface 5. During the charging process, the WIFI connector 7 disposed inside the charging terminal housing can provide a wireless network for the mobile phone, which can make the user very charged when charging. Good killing time, and the built-in storage 8 installed inside the charging terminal housing can better provide the data storage transmission function for the mobile phone, that is, the problem that the mobile phone occupies its own memory when browsing the webpage, and provides a platform for data transmission. It is convenient for users to use.

With the above technical solution of the charging device of the third exemplary embodiment of the present invention, the charging device of the present invention has a charging function through the built-in power supply and the USB interface, and the set WIFI connector further functions as a data interaction (for example, Internet access, the built-in storage can provide real-time exchange of data for charging users, reducing the burden on the phone memory.

4 is a block diagram of a charging device in accordance with a fourth exemplary embodiment of the present invention.

As shown in FIG. 4, a charging apparatus according to a fourth exemplary embodiment of the present invention includes a charging terminal 1 in which a built-in power source 2, a current/voltage conversion device 3, and a controller 4 are disposed. The charging device further includes a WIFI connector 7 and a built-in memory 8, one or more data lines 5, and the charging device may further include a two-dimensional code controller 6.

The built-in power source 2 is connected to the current/voltage conversion device 3, the current/voltage conversion device 3 is connected to the WIFI connector 7, the WIFI connector 7 is connected to the built-in storage 8, and the built-in storage 8 is connected to the controller 4, The controller 4 is connected to one or more data lines 5, and the controller 4 is connected to a two-dimensional code controller 6 provided outside the charging terminal 1.

A battery slot can be connected to the built-in power source 2, and a battery pack is disposed in the battery slot.

The voltage provided by the built-in power source 2 can be a 12V weak electric voltage.

Before charging the mobile phone using the charging device according to the fourth exemplary embodiment of the present invention, the charging device may be connected to an external 220V DC power source to charge the charging device, thereby enabling the built-in power source 2 of the charging device Stores electrical energy.

The current/voltage conversion device 3 can be used to convert the current/voltage according to the current/voltage requirements of the portable device to be connected to output a current/voltage suitable for the portable device.

The two-dimensional code controller 6 can generate a two-dimensional code. For example, the portable terminal of the mobile phone can scan the two-dimensional code on the two-dimensional code controller 6 when charging is required, and then the two-dimensional code controller 6 sends a signal to the controller 4. So that the controller 4 controls the internal circuit of the charging terminal 1 to be turned on, and the current/voltage conversion device Set 3 to convert the current/voltage output from the built-in power supply 2 according to the current/voltage required by the portable terminal.

In addition, the WIFI connector 7 provides a WIFI connection for the user, so that the user can bring data interaction function when using, and the controller manages and controls the signal during signal and transmission.

The built-in storage 8 is used to provide a data storage transmission function for a portable device such as a mobile phone, that is, the problem that the portable device occupies its own memory when browsing a webpage.

The controller 4 is used to control the data transfer function in the built-in memory 8.

The capacity of the built-in storage 8 can be set as needed.

In specific use, the two-dimensional code generated by the two-dimensional code controller 6 is scanned by the mobile phone, and then the controller 4 is sent a signal to cause the controller 4 to control the internal circuit of the charging terminal 1 to remain on, thus causing the data line 5 to be Connected with the built-in power supply 2, thereby achieving the function of charging, and during the charging process, the controller 4 also controls the WIFI connector 7 to provide a wireless network for the mobile phone, so the user can connect to the wireless network to access the Internet, and In the process of surfing the Internet, the built-in storage 8 provides a space for data exchange for the mobile phone, and can provide rich network resources, and can provide users with rich download resources. The charging control strategy in the first embodiment can also be applied to the fourth embodiment, and details are not described herein again.

With the above technical solution of the charging device according to the fourth exemplary embodiment of the present invention, the charging device of the present invention has a charging function through the built-in power supply and the data line, and the set WIFI connector further functions as a convenient Internet access, and The built-in storage has achieved the function of exchanging data when surfing the Internet. In addition, the set QR code controller is controlled by the controller, and the self-charging function is realized.

Moreover, variations to the exemplary embodiments of Figures 1-4 may also be included in accordance with embodiments of the present invention. For example, the charging device may also include a separate interface circuit that is connected between the controller 4 and the data line 5 to control all of the data lines 5 in the same manner. According to another example, an interface circuit connected between the controller 4 and the interface 6 can likewise be included in FIG. Also, according to other examples, the same interface circuit can also be included in Figures 3-4.

FIG. 5 illustrates a charging method including receiving a signal that the device to be charged performs a predetermined operation, and turning on a charging operation of the charging device, according to an exemplary example of the present invention.

According to an embodiment, the receiving step comprises: accepting that the charging device scans the two-dimensional code And/or a signal that performs a two-dimensional code designation operation.

According to one embodiment, the operations include accessing one or more of a specified web page, browsing an advertisement, watching a video, and paying a fee.

According to an embodiment, the method further comprises monitoring a remaining amount of power and/or a charging current of the built-in power source and controlling charging based on the remaining power and/or charging current.

According to an embodiment, the charging method further comprises: when the remaining power is lower than the first threshold, stopping accepting charging of a new external device, or independently controlling charging of the connected one or more external devices according to a time slice .

According to an embodiment, the charging method further includes controlling the number of external devices that simultaneously perform charging when it is monitored that the remaining amount of the built-in power source is lower than the third threshold.

The invention has been described above with reference to the exemplary embodiments of the invention. The related features in the first to fourth embodiments can be arbitrarily combined to implement different functions, for example, the wifi connector in the second embodiment can be applied to the first embodiment to realize the function of providing the wifi service during charging, and the third The built-in storage in the embodiment can also be applied to other embodiments to implement the function of data storage. These variations are readily conceivable by those skilled in the art based on the teachings of the present invention.

Although the present invention has been particularly shown and described with reference to the exemplary embodiments of the invention, those skilled in the art And various changes in the details.

Claims (18)

A charging device includes a charging terminal, wherein the charging terminal is provided with a built-in power source, a current/voltage conversion device, a controller and one or more charging ports, and the charging port can be connected to an external device. The built-in power source is coupled to a current/voltage conversion device that is coupled to a controller that is coupled to the one or more charging ports. The charging device according to claim 1, wherein said charging device further comprises a two-dimensional code controller and a display, said two-dimensional code controller generating a two-dimensional code individually or under the control of said controller and The generated two-dimensional code is displayed on the display. The charging device of claim 2 wherein said two-dimensional code is encoded with predefined information, including advertisements, websites, audio, video, links, charging information. A charging apparatus according to claim 2 or 3, wherein said controller includes a switching circuit corresponding to said one or more charging ports, said controller detecting said second device when said external device is scanned The controller controls the switching circuit corresponding to the charging port to be turned on when the dimension code and/or the operation of the two-dimensional code definition is performed. The charging apparatus according to any one of claims 1 to 4, wherein the controller is configured to monitor a remaining amount of power and/or a charging current of the built-in power source and control according to the remaining amount of power and/or charging current Charging. The charging apparatus according to claim 5, wherein said controller is configured to: when said remaining amount of electricity is lower than a first threshold, said controller stops charging a new external device, or said controller follows time The segments independently control charging with one or more external devices connected. The charging apparatus according to claim 5, wherein the controller is configured to control the number of external devices that simultaneously perform charging when it is monitored that the remaining amount of the built-in power source is lower than the third threshold. The charging apparatus according to claim 1, wherein said current/voltage conversion means converts a current/voltage from the built-in power source in accordance with a current/voltage required by an external device connected through said one or more charging ports. The charging device of claim 1 wherein said one or more charging ports comprise one or more data lines or one or more USB interfaces, Lightning interfaces or micro USB interfaces. The charging device according to any one of claims 1 to 4, wherein the charging terminal further comprises a WIFI connector connected between the current/voltage conversion device and the controller. The charging device according to any one of claims 1 to 4, wherein the charging terminal further comprises built-in storage, the built-in storage being connected between the WIFI connector and the controller. The charging device according to any one of claims 1 to 4, wherein a battery slot is connected to the built-in power source, and a battery pack is disposed in the battery slot. A method of charging using a charging device according to any one of claims 1-12, comprising: Receiving a signal that the external device performs a predetermined operation; Turning on the charging operation of the charging device. The method of claim 13 wherein said receiving step comprises receiving a signal that said charging device has scanned a two-dimensional code and/or performed a two-dimensional code designation operation. The method of claim 13 or 14, wherein the operation comprises: accessing a web page, viewing one or more of an advertisement, a video, and a payment fee. The method of claim 13 or 14, further comprising: monitoring a remaining amount of power and/or a charging current of said built-in power source, and controlling charging based on said remaining amount of power and/or charging current. The method of claim 16 further comprising: stopping receiving new external device charging when said remaining power is below a first threshold, or independently controlling one or more external devices connected to each other according to time segments Charging. The method according to claim 16 or 17, further comprising controlling the number of external devices that are simultaneously charged when it is monitored that the remaining amount of the built-in power source is lower than the third threshold.

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