JP5604134B2 - Portable electronic device and device system - Google Patents

Description

  The present invention relates to a portable electronic device such as a mobile phone and a PDA (Personal Digital Assistants), and a device system including the portable electronic device.

  Most portable electronic devices such as mobile phones use a secondary battery such as a lithium ion battery or nickel metal hydride battery as a power source, and can be used continuously for a long time by charging the secondary battery from the outside. Is possible. In recent years, an increasing number of portable electronic devices are connected to an external device such as a PC (personal computer) via a USB (Universal Serial Bus) cable and the like, and a secondary battery can be charged by power supplied from the external device. Yes.

  Such a portable electronic device can receive only a small current (for example, 100 mA) immediately after being connected to the external device according to the USB standard, but a process called enumeration is performed with the external device. Therefore, it becomes possible to receive a large current (for example, 500 mA). Here, enumeration refers to the USB device (portable electronic device) that notifies the USB host (external device) of the type and function of the USB device, and the USB host side prepares to operate the USB device ( For example, it refers to a series of preparation processes for installing a driver.

  In Patent Document 1 below, in a portable terminal equipped with a USB connector and a secondary battery, when a voltage is applied to the USB connector, a small current is passed from the USB connector to the secondary battery, and a rechargeable battery is connected to the USB connector. When it is determined that a large current flows from the USB connector to the secondary battery, a technique is disclosed.

JP 2009-60716 A

  By the way, a portable electronic device connected by USB to an external device cannot receive a large current from the external device unless the above-described enumeration (preparation process) is performed. PCs that are usually used by users of portable electronic devices are often connected to portable electronic devices, and it is considered that drivers for portable electronic devices are installed. It is thought that enumeration can be completed. Therefore, if the user connects the portable electronic device to the PC that the user normally uses, a large current is supplied from the PC to the portable electronic device, so that the secondary battery of the portable electronic device can be rapidly charged.

  However, since there are few opportunities for the portable electronic device to be connected to an external device other than the PC that is usually used by the user of the portable electronic device, a driver for the portable electronic device is not installed. Enumeration cannot be completed with an electronic device. Even if the portable electronic device is connected to such an external device via USB, the current supplied from the external device to the portable electronic device is small, and thus it takes a long time to charge the secondary battery of the portable electronic device. There was a problem.

  The present invention has been made in view of the above circumstances, and rapidly charges a secondary battery even when connected to an external device that has not been prepared for receiving a large current. It is an object of the present invention to provide a portable electronic device that can be used and a device system that enables rapid charging of the portable electronic device.

In order to solve the above problems, a portable electronic device of the present invention includes a connection unit to which an external device is connected, a secondary battery that is charged by a current supplied from the external device through the connection unit, and When the external device is connected to the storage unit that stores the unique first identification information assigned to the device and the second identification information assigned to the general-purpose device connected to the external device. In addition, when the current supplied from the external device is a first current smaller than the second current, the second identification information stored in the storage unit is transmitted to the external device to transmit the second current. And a control unit that performs control for receiving the supply of.
In the portable electronic device of the present invention, the second identification information is information indicating that the device is a general-purpose memory device connected to the external device.
Further, in the portable electronic device of the present invention, when the control unit is in a state in which the charging state of the secondary battery is capable of executing a preparation process that makes the device usable for the external device, Control is performed to transmit the second identification information to the external device and receive the supply of the second current.
Further, in the portable electronic device of the present invention, the control unit is configured to perform the operation on the external device when the state of charge of the secondary battery is a state in which all functions of the device can be operated. The first identifier stored in the storage unit is transmitted, and a preparation process for enabling the unique function of the device to be used with the external device is performed.
The portable electronic device according to the present invention may be configured such that when the preparation process for enabling the control unit to use the unique function of the device with the external device has failed, the storage unit stores the memory in the external device. The control for receiving the supply of the second current by transmitting the second identification information stored in the unit is performed again.
Moreover, the portable electronic device of the present invention is characterized in that the control unit determines that the preparation process has failed when a driver corresponding to the portable electronic device is not stored in the external device.
A device system according to the present invention includes any one of the portable electronic devices described above and an external device that supplies the first current or the second current to the connected portable electronic device. It is said.
In the device system of the present invention, the external device is connected when the first identification information is transmitted from the portable electronic device and when the second identification information is transmitted from the portable electronic device. The display of the portable electronic device is different.

  According to the present invention, there is an effect that the secondary battery can be rapidly charged even when it is connected to an external device that is not subjected to a preparation process for receiving a supply of a large current.

It is a figure which shows the external appearance of the apparatus system by one Embodiment of this invention. 3 is a block diagram showing an internal configuration of a mobile phone 20. FIG. It is a flowchart which shows operation | movement of the mobile telephone which makes a part of apparatus system by one Embodiment of this invention. It is a figure which shows the example of a display of the mobile telephone recognized by the computer.

  Hereinafter, a portable electronic device and a device system according to an embodiment of the present invention will be described in detail with reference to the drawings. In the present embodiment, a case where the mobile electronic device is a mobile phone will be described as an example. FIG. 1 is a diagram showing an external appearance of a device system according to an embodiment of the present invention. As shown in FIG. 1, the device system 1 includes a computer 10 (external device) and a mobile phone 20 (mobile electronic device) connected to each other by a USB connection cable C1.

  The computer 10 includes an input device 11 such as a keyboard and a mouse, an output device 12 such as a liquid crystal display device, and a device body 13. For example, the computer 10 performs processing according to a user instruction input from the input device 11. The processing result is output to the output device 12. The main body device 13 includes a USB connector 33 (see FIG. 2) to which the USB connection cable C1 is connected, and exchanges various data with the mobile phone 20 connected via the USB connection cable C1. The current can be supplied to the mobile phone 20. The current supplied from the computer 10 to the mobile phone 20 is used for charging a secondary battery 35 (see FIG. 2) provided in the mobile phone 20, for example.

  The apparatus main body 13 is connected to the mobile phone 20 for the first time via the USB connection cable C1, and in a state where enumeration (preparation processing) is not performed with the mobile phone 20, a small current ( For example, 100 mA: first current) is supplied. In contrast, after enumeration with the mobile phone 20 is completed, a large current (for example, 500 mA) is supplied to the mobile phone 20.

  Here, in addition to the mobile phone 20, other USB devices may be connected to the apparatus main body 13. After completing the enumeration with the connected USB device, the device main body 13 outputs (displays) information indicating the type of the USB device identified by the enumeration to the output device 12. In other words, the apparatus main body 13 changes the display of the connected USB device according to the type of the identified USB device.

  For example, if the mobile phone 20 is identified as a modem capable of data communication when the mobile phone 20 is connected by the USB connection cable C1, the device main body 13 displays the mobile phone 20 as “modem”. . When a card reader (mass storage class card reader), which is a general-purpose USB device, is connected by the USB connection cable C1, the card reader is displayed as “mass storage device”. If the mobile phone 20 connected by the USB connection cable C1 is identified as a card reader, the mobile phone 20 is displayed as “mass storage device”.

  The mobile phone 20 performs wireless communication with a base station (not shown), thereby making a call with a mobile phone or the like owned by another user, and data with a server device connected to the base station. Realize communication, e-mail transmission and reception, etc. When connected to the apparatus main body 13 of the computer 10 via the USB connection cable C1, the secondary battery 35 is charged by the current supplied from the apparatus main body 13 via the USB connection cable C1.

  Here, when the current supplied from the device body 13 of the computer 10 is a small current, the mobile phone 20 has identification information (dummy descriptor D2: second identification information) for recognizing the own device as a card reader. Is transmitted to the apparatus main body 13. This is because a large current is supplied from the device main body 13 of the computer 10 without performing an enumeration for realizing a specific function (for example, a modem function) of the mobile phone 20. This is to enable quick charging. The details of the control performed to charge the secondary battery 35 will be described later.

  FIG. 2 is a block diagram showing an internal configuration of the mobile phone 20. As shown in FIG. 2, the mobile phone 20 includes a radio circuit 21, a codec unit 22, a microphone 23, a speaker 24, a camera 25, an operation unit 26, a vibration unit 27, a card IF (interface) 28, a display control unit 29, an LCD ( Liquid crystal display device) 30, nonvolatile memory 31 (storage unit), volatile memory 32, USB connector 33 (connection unit), USB driver circuit 34, secondary battery 35, power supply control unit 36 (control unit), and CPU ( A central processing unit) 37 (control unit).

  The radio circuit 21 is connected to the antenna 21 a and performs radio communication with a base station (not shown) under the control of the CPU 37. Specifically, a radio signal received by the antenna 21a is demodulated into a reception signal and output to the CPU 37, and a transmission signal output from the CPU 37 is modulated into a radio signal and output to the antenna 21a. The codec unit 22 decodes the audio signal output from the CPU 37, converts the decoded audio signal (digital signal) into an analog signal, amplifies the analog signal, and outputs the analog signal to the speaker 24. The codec unit 22 converts the audio signal (analog signal) output from the microphone 23 into a digital signal, encodes the digital signal, and outputs the digital signal to the CPU 37.

  The camera 25 includes a lens and a photoelectric conversion element such as a CMOS (Complementary Metal Oxide Semiconductor) sensor, and outputs image data taken in accordance with an instruction from the CPU 37 to the CPU 37. The operation unit 26 includes a plurality of operation keys that can be pressed in various manners such as a numeric keypad, a call key, an end key, and a multi-directional key that are operated by the user. Output to. The vibration unit 27 includes a vibrator that vibrates under the control of the CPU 37. The vibrator vibrates to notify the user of the mobile phone 20 that a call or an e-mail has been received.

  The card IF 28 is configured so that the flash memory 28a is detachable, and under the control of the CPU 37, data is written to the flash memory 28a or data stored in the flash memory 28a is read. Note that the flash memory 28a is used, for example, for storing image data taken by the camera 25 or for transferring data between the mobile phone 20 and another electronic device (for example, the computer 10). The display control unit 29 performs control to display an image on the LCD 30 under the control of the CPU 37.

  The nonvolatile memory 31 is a NAND flash memory, and stores various programs executed by the CPU 37, identification information for causing the computer 10 to identify the mobile phone 20, and the like. Specifically, the various programs executed by the CPU 37 include a boot program and an application program, and the identification information includes a device descriptor D1 (first identification information) and a dummy descriptor D2 (second identification information).

  Here, the boot program is a program for starting the mobile phone 20 when the mobile phone 20 is turned on or restarted, and the application program is a program for realizing various functions of the mobile phone 20. The device descriptor D1 is unique identification information assigned to the mobile phone 20, and the dummy descriptor D2 is identification information assigned to a general-purpose device connected to the computer 10. If enumeration is performed with the computer 10 using the device descriptor D1, the mobile phone 20 can be recognized as a modem by the computer 10. On the other hand, if enumeration is performed with the computer 10 using the dummy descriptor D2, the computer 10 can recognize the mobile phone 20 as a card reader (general-purpose memory device).

  The volatile memory 32 is, for example, an SDRAM (Synchronous Dynamic Random Access Memory), and is used as a work area for temporarily storing data handled by the CPU 37, for example. The USB connector 33 is a connection connector to which a USB connection cable C1, a USB device, or a charger is connected. The USB driver circuit 53 communicates with a USB device (for example, the computer 10) connected via the USB connector 33 under the control of the CPU 37.

  The secondary battery 35 is a rechargeable battery such as a lithium ion battery, a nickel metal hydride battery, or a nickel cadmium battery, and supplies power necessary for the operation of the mobile phone 20 to each part of the mobile phone 20. The power control unit 36 determines the charging state of the secondary battery 35 based on the output voltage of the secondary battery 35, and performs start-up control of the CPU 37 and charging control for the secondary battery 35 according to the determination result.

  Specifically, when the power supply control unit 36 determines that the state of charge of the secondary battery 35 is a state of charge incapable of starting the boot program stored in the nonvolatile memory 31, the power supply control unit 36 controls the start of the CPU 37. Instead, the secondary battery 35 is controlled to be charged by a small current supplied from the apparatus main body 13 of the computer 10 via the USB connection cable C1. On the other hand, when it is determined that the charging state of the secondary battery 35 is a charging state in which the boot program can be started but the main program cannot be started, the power supply control unit 36 sends the boot program to the CPU 37. Control to start. In addition, a control for charging the secondary battery 35 is performed using a large current supplied from the apparatus main body 13 of the computer 10 by enumeration using the dummy descriptor D2 performed by starting the boot program.

  Further, when the power supply control unit 36 determines that the charging state of the secondary battery 35 is a charging state in which the main program stored in the nonvolatile memory 31 can be started, the CPU 37 causes the CPU 37 to start the main program. I do. In addition, control is performed to charge the secondary battery 35 using a large current supplied from the device main body 13 of the computer 10 by enumeration using the device descriptor D1 performed by starting the main program. Although details will be described later, an enumeration using the device descriptor D1 is performed between the mobile phone 20 and the computer 10, so that a unique function (for example, a data communication function) of the mobile phone 10 is changed to the computer 10. Can be used between.

  The CPU 37 activates the above-described boot program or main program under the control of the power supply control unit 36, and controls each of the blocks forming the mobile phone 20 shown in FIG. Overall control of the operation. When the mobile phone 20 and the computer 10 are connected via the USB connection cable C1, enumeration is performed with the computer 10 using the device descriptor D1 or the dummy descriptor D2.

  Next, the operation of the device system 1 having the above configuration will be described. FIG. 3 is a flowchart showing the operation of the mobile phone forming a part of the device system according to the embodiment of the present invention. The flowchart shown in FIG. 3 is started when the mobile phone 20 is connected to the apparatus main body 13 of the computer 10 by the USB connection cable C1. If the mobile phone 20 is connected to the apparatus main body 13 of the computer 10, a small current (100 mA) is supplied from the apparatus main body 13 to the mobile phone 20.

  When the mobile phone 20 is connected to the apparatus main body 13 of the computer 10, first, the power control unit 36 of the mobile phone 20 determines whether the charge state of the secondary battery 35 is based on the output voltage of the secondary battery 35. It is determined whether or not the battery is in a charged state in which the boot program stored in can be activated (step S11). When it is determined that the boot program cannot be activated (when the determination result is “NO”), the power supply control unit 36 can activate the boot program when the secondary battery 35 is charged. Control is performed to charge the secondary battery 35 using a small current supplied from the apparatus main body 13 of the computer 10 until the battery 10 is charged (step S12).

  If the secondary battery 35 is charged until the boot program can be activated by the process of step S12, or if the determination result of step S11 is “YES”, the power supply control unit 36 Based on the output voltage of the secondary battery 35, it is determined whether or not the charged state of the secondary battery 35 is a charged state in which the main program stored in the nonvolatile memory 31 can be activated (step S13). When it is determined that the main program cannot be activated (when the determination result is “NO”), the power supply controller 36 controls the CPU 37 to activate the boot program (step S14). ).

  When the boot program is activated, the CPU 37 performs enumeration with the computer 10 using the dummy descriptor D2 (step S15). Specifically, the dummy descriptor D2 stored in the nonvolatile memory 31 is read, and the USB driver circuit 34 is controlled to transmit the read dummy descriptor D2 to the apparatus main body 13 of the computer 10.

  Here, the dummy descriptor D2 is identification information for causing the mobile phone 20 to be recognized as a mass storage class card reader as described above. For this reason, when the enumeration using the dummy descriptor D2 between the mobile phone 20 and the computer 10 is completed, the computer 10 recognizes the mobile phone 20 as a card reader (general-purpose memory device). At the time of enumeration, information indicating that the memory card is not inserted in the card reader is also transmitted from the mobile phone 20 to the computer 10 together with the dummy descriptor D2. By transmitting this information, it is possible to prevent a user who uses the computer 10 from accessing the mobile phone 20 as a card reader.

  A mass storage class card reader for the computer 10 is a general-purpose USB device, and a driver for using the card reader is prepared in advance as a standard driver. For this reason, a new installation of a driver necessary for using the card reader is not performed. When the mobile phone 20 is recognized, the computer 10 displays the mobile phone 20 on the output device 12 as “mass storage device”.

  FIG. 4 is a diagram showing a display example of the mobile phone recognized by the computer. When enumeration is performed using the dummy descriptor D2, as shown in FIG. 4A, the cellular phone 20 displays “mass storage device device” in a window W1 displaying devices managed by the computer 10. Is displayed Q1. Further, if a device name “Mobile Terminal” is set in advance in the mobile phone 20, a display “Mobile Terminal” is displayed as a specific name of the disk drive that is “mass storage device” in the window W1. Q2 is made.

  When the above enumeration is completed, supply of a large current (500 mA) from the apparatus main body 13 to the mobile phone 20 is started. As a result, the power supply control unit 36 uses the large current supplied from the apparatus main body 13 of the computer 10 until the charged state of the secondary battery 35 becomes a charged state where the main program can be activated. Control to charge is performed (step S16). Here, since the secondary battery 35 is charged with a large current, the time required for charging is shortened as compared with the case where it is charged with a small current.

  When the secondary battery 35 is charged until the main program can be activated by the process of step S16, or when the determination result of step S13 is “YES”, the power control unit 36 is the CPU 37. The main program is controlled to be activated (step S17). When the main program is activated, the CPU 37 performs enumeration with the computer 10 using the device descriptor D1 (step S18). Specifically, the device descriptor D1 stored in the nonvolatile memory 31 is read, and the device descriptor D1 read by controlling the USB driver circuit 34 is transmitted to the apparatus body 13 of the computer 10.

  Here, the device descriptor D1 is unique identification information assigned to the mobile phone 20, as described above. For this reason, when the cellular phone 20 is connected to the computer 10 for the first time, or when a driver for using the cellular phone 20 is not installed in the computer 10, a driver for using the functions of the cellular phone 20 is installed. A new installation process is performed by the computer 10.

  Next, the CPU 37 of the mobile phone 20 determines whether or not enumeration with the computer 10 has ended normally (step S19). When it is determined that enumeration has been completed normally (when the determination result is “YES”), the CPU 37 sets the connection with the computer 10 as a normal connection, while the current control unit 36 receives a large current from the computer 10. And the charging control of the secondary battery 35 is continued (step S20). Here, “normal connection” refers to a connection in a state where a unique device of the mobile phone 20 can be used.

  When the enumeration using the device descriptor D1 ends normally, as shown in FIG. 4B, a display Q3 “Mobile Terminal” as the name of the modem is displayed in the window W1 displaying the devices managed by the computer 10. Made. Comparing FIG. 4 (a) and FIG. 4 (b), the computer 10 performs the enumeration using the device descriptor D1 and the enumeration using the dummy descriptor D2. Thus, it can be seen that the display about the mobile phone 20 is different.

  On the other hand, when it is determined that enumeration is not normally completed (when the determination result of step S19 is “NO”), the CPU 37 reads the dummy descriptor D2 from the nonvolatile memory 31 again, and the computer 10 The enumeration using the dummy descriptor D2 is executed again between (step S21). The CPU 37 determines that enumeration has not ended normally (failed) when the driver corresponding to the mobile phone 20 is not installed (stored) in the computer 10. Then, the current control unit 36 receives the supply of a large current from the computer 10 and continues the charging control of the secondary battery 35 without causing the CPU 37 to normally connect the computer 10 (step S22).

  As described above, in the present embodiment, when the charging state of the secondary battery 35 charged by the small current supplied from the computer 10 becomes a state in which the boot program can be started, the mobile phone 20 The dummy descriptor D2 is transmitted to 10 to receive a large current from the computer 10, and the secondary battery 35 is charged by the large current. For this reason, even when the cellular phone 20 is connected to the computer 20 on which preparation processing such as driver installation has not been performed, the secondary battery 35 of the cellular phone 20 can be rapidly charged.

  In this embodiment, information indicating that the memory card is not inserted in the card reader is also transmitted to the computer 10 together with the dummy descriptor D2 for recognizing the mobile phone 20 as a mass storage class card reader. For this reason, even if the mobile phone 20 is recognized by the computer 10 as another device (card reader) in order to quickly charge the secondary battery 35, an erroneous access (card reader) from the computer 10 to the mobile phone 20 is possible. Access) can be prevented.

  As mentioned above, although the portable electronic device and apparatus system by one Embodiment of this invention were demonstrated, this invention is not restrict | limited to the said embodiment, It can change freely within the scope of the present invention. For example, in the above-described embodiment, the example using the dummy descriptor D2 that recognizes the mobile phone 20 as a card reader has been described. However, the dummy descriptor is not limited as long as it can receive a large current from the computer 10 and can make the computer 10 recognize that it is a general-purpose device that does not require installation of a driver. In addition, the present invention is not limited to a mobile phone, and can be applied to a portable electronic device having portability such as a PDA.

DESCRIPTION OF SYMBOLS 1 Device system 10 Computer 20 Cellular phone 31 Non-volatile memory 33 USB connector 35 Secondary battery 36 Power supply control part 37 CPU
D1 Device descriptor D2 Dummy descriptor

Claims (2)

A connection to which an external device is connected;
A portable electronic device comprising a secondary battery charged by a current supplied from the external device through the connection unit,
When the external device is connected to the connection unit and the charging state of the secondary battery is a state in which the portable electronic device cannot be started, the first current is supplied from the external device, and the second battery When the state of charge of the secondary battery is such that the portable electronic device can be activated, information indicating that the portable electronic device is a general-purpose device connected to the external device is transmitted to the external device, A portable electronic device comprising: a control unit that performs control to receive a second current larger than the first current from the device. And external equipment,
An electronic device having a connection to which the external device is connected ;
An equipment system comprising:
The electronic device is
A secondary battery that is charged by a current supplied from the external device through the connection unit;
When the external device is connected to the connection unit, when the state of charge of the secondary battery is a state in which the electronic device cannot be activated, the secondary device receives the first current from the external device, and when the state of charge of the battery is ready to start the electronic apparatus, the information indicating that the general-purpose equipment electronic apparatus is connected to the external device is transmitted to the external device, the external device A control unit that performs control to receive a second current larger than the first current from
Equipment system, characterized in that it comprises a.

Images