JP5162188B2 - Mobile communication terminal, startup method, and boot program - Google Patents

Description

  The present invention relates to a mobile device, a startup method, and a boot program, and more particularly to a mobile device using a secondary battery as a power source.

  A mobile device represented by a mobile phone uses a secondary battery such as a lithium ion battery or a nickel metal hydride battery as a power source. For this reason, it is necessary to charge the secondary battery by receiving power from the outside. In recent years, portable devices equipped with a USB (Universal Serial Bus) connector have become widespread, and can be supplied with power from an external device connected by a USB cable. When receiving power from an external device connected by a USB cable, only a current of 100 mA can be supplied at first according to the standard. In order to increase the current value of the power supplied from the external device, make sure that the external device is a charger, or after communicating with the external device and negotiating The current value of the power supplied from the device cannot be increased. For example, Patent Documents 1 to 3 describe a technique for charging a secondary battery or a technique for driving a portable device with power received from an external device connected by a USB cable.

  However, the conventional technique relates to a technique in the case where the secondary battery stores sufficient power to drive the portable device. If the secondary battery is in an overdischarged state that cannot output the minimum voltage required to drive the portable device, the central processing unit (CPU) of the terminal device cannot be driven and the external device is charged. Neither confirmation of the device nor communication with an external device can be performed. For this reason, there are the following problems.

If power with a current of 100 mA supplied from an external device is supplied, the voltage of the secondary battery rises and the CPU can be driven. However, after starting up, the CPU must execute a boot program before confirming that the external device is a charger or before communicating with the external device, and the power consumption of the CPU during that time Is larger than the 100 mA current power supplied from the external device, the CPU is reset before confirming that the external device is a charger or before communicating with the external device. For this reason, there is a problem that the CPU cannot be activated indefinitely.
JP 2003-28771 A JP 2003-219561 A JP 2005-339184 A

  The present invention has been made to solve the above-described problems, and one of the objects of the present invention is to provide a portable device that can be activated even when the secondary battery is in an overdischarged state. is there.

  Still another object of the present invention is to provide a starting method capable of starting even when the secondary battery is in an overdischarged state.

  Still another object of the present invention is to provide a boot program that can be activated even when the secondary battery is in an overdischarged state.

According to an aspect of the present invention to achieve the above-described object, the portable device includes an input terminal to which an external device can be connected, a secondary battery that receives a supply of current from the external device connected to the input terminal, Current control means for controlling current flowing from the input terminal to the secondary battery, boot program storage means for storing a boot program including a control program for executing processing for controlling the current control means, and operating voltage from the secondary battery Control means that operates when the above voltage is supplied, and executes a boot program after activation, and activation means that activates the control means when the output voltage of the secondary battery is higher than the activation voltage higher than the operation voltage; And the control means executes the control program of the boot programs stored in the storage means after being activated by the activation means, and the activation voltage is the control means It is determined from the power consumed by the control means and the operating voltage from the start to the end of execution of the control program, and the control program detects that a specific external device is connected to the input terminal And when the detection step does not detect that a specific external device is connected , a step of waiting until the output voltage of the secondary battery reaches a simple start voltage, and a specific external device is connected by the detection step it in response to being detected, to execute the current flowing from the input terminal to the current control unit to the secondary battery from the first current a step to switch to a larger second current than the first current, to the control means, simple activation voltage, the electric power control means is consumed by the control unit before terminating the execution of the boot program, Ru Sadama from the operating voltage.

According to this aspect, the control means is activated on the condition that the output voltage of the secondary battery is equal to or higher than the activation voltage higher than the operating voltage, and the control program of the boot program is executed by the control means. The current flowing from the input terminal to the secondary battery is switched from the first current to the second current in response to detecting that the specific external device is connected to the input terminal by the control means that executes the control program. . Since the start-up voltage is determined from the power consumed by the control unit and the operating voltage from the start of the control unit to the end of the execution of the control program in the boot program, the control unit ends the execution of the control program. The output voltage of the secondary battery does not become lower than the operating voltage. Also, if it is not detected that a specific external device is connected, it will wait until the output voltage of the secondary battery reaches a simple startup voltage determined from the power consumed by the boot program and the operating voltage. Therefore, the boot program can be executed. For this reason, even when a specific external device is not connected, the boot program can be executed to the end, and the portable device can be activated. In addition, after the current flowing from the input terminal to the secondary battery is switched from the first current to the second current, power exceeding the power consumed by the control means is supplied from the input terminal to the secondary battery. After finishing the execution of the control program, the output voltage of the secondary battery does not become lower than the operating voltage. As a result, a portable device that can be activated even when the secondary battery is in an overdischarged state can be provided.

  Preferably, the storage means is a non-volatile memory, and further includes a volatile work storage means used as a work area of the control means separately from the storage means, and the boot program is stored in the storage means. It further includes a transfer program for causing the control means to execute processing for transferring the program to the working storage means, and the control means executes the transfer program after executing the control program.

  According to this aspect, after the control program is executed by the control means, the transfer program is executed. By executing the control program, the current flowing from the input terminal to the secondary battery is switched from the first current to the second current, so that the transfer program can be reliably executed.

  Preferably, the control means executes an application program stored in the storage means.

  According to this aspect, the application program can be surely executed.

Good Mashiku the starting voltage is, after the control unit has finished the execution of the control program from the start, a voltage the voltage of the secondary battery is in an operating voltage or more.
Preferably, the simple startup voltage is a voltage at which the voltage of the secondary battery becomes equal to or higher than the operating voltage after the control means finishes executing the boot program.
Preferably, the current switching means causes the first current to flow from the input terminal to the secondary battery in response to the voltage being applied to the input terminal, and is controlled by the control means to cause the second current from the input terminal to the secondary battery. Shed.

According to another aspect of the present invention, the activation method is an activation method executed in a portable device, and the portable device has an input terminal to which an external device can be connected and an electric current from the external device connected to the input terminal. A secondary battery that receives the supply of current, a current control means for controlling the current flowing from the input terminal to the secondary battery, a storage means for storing an application program, a control program for executing a process for controlling the current control means, and Boot program storage means for storing a boot program including a transfer program, control means for operating when a voltage higher than the operating voltage is supplied from the secondary battery, and executing the boot program after startup , and output voltage of the secondary battery There the activation means for activating the control means in the case where high starting voltage higher than the operating voltage, working memory hand used as a work area for the control unit When, with a starting voltage includes a power control unit is consumed by the control unit before terminating the execution of the control program of the boot program from the start, Sadamari from the operating voltage, the control program, the current control A step of performing settings for communicating with the means, a step of detecting whether or not a specific external device is connected to the input terminal, and a case where the detection step does not detect that a specific external device is connected. A current that flows from the input terminal to the secondary battery in the current control means in response to the detection of the step of waiting until the output voltage of the battery reaches the simple startup voltage and the detection step connecting the specific external device. and a step for shifting the larger second current having a current value than the first current from the first current, to execute the control means, the transfer program, the control pro After the ram has been executed, to execute a step of transferring the application program in the working memory means, to the control unit, simply starting voltage, the power control means is consumed by the control unit while performing the step of transferring If, Ru Sadama from the operating voltage.

  If this situation is followed, the starting method which can start a portable apparatus even if a secondary battery is an overdischarge state can be provided.

According to still another aspect of the present invention, the boot program is a boot program executed by a portable device, and the portable device includes an input terminal to which an external device can be connected and an external device connected to the input terminal. A secondary battery that receives a current supply, a current control unit that controls a current flowing from the input terminal to the secondary battery, a storage unit that stores an application program, and a control program for executing a process that controls the current control unit Boot program storage means for storing a boot program including a transfer program, a control means that operates when a voltage higher than the operating voltage is supplied from the secondary battery, and executes the boot program after startup, and the output of the secondary battery Starting means for starting the control means when the voltage is higher than the starting voltage higher than the operating voltage;
Working memory means used as a work area of the control means, and the startup voltage is the power consumed by the control means from the start of the control means to the end of execution of the control program in the boot program, The control program is determined based on the operating voltage, the control program is configured to perform settings for communicating with the current control means, the detection step detects whether a specific external device is connected to the input terminal, and the detection step specifies If it is not detected that the external device is connected, the step of waiting until the output voltage of the secondary battery reaches the simple startup voltage and the detection step detects that the specific external device is connected. The current control means switches the current flowing from the input terminal to the secondary battery from the first current to the second current having a current value larger than the first current. That a step is performed to the control unit, the transfer program, after the control program is executed, to execute a step of transferring the application program in the working memory means, to the control unit, simply starting voltage, the control means There the power consumed by the control unit while performing the step of transferring, Ru Sadama from the operating voltage.

  According to this aspect, it is possible to provide a boot program capable of starting the portable device even when the secondary battery is in an overdischarged state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  Hereinafter, a mobile phone will be described as an example of the mobile device. FIG. 1 is a perspective view showing an appearance of a mobile phone according to one embodiment of the present invention. Referring to FIG. 1, mobile phone 1 includes an operation side portion 3 and a display side portion 2. An operation key 14 such as a numeric keypad and a call key and the microphone 13 are disposed on the inner side surface of the operation side portion 3, and a USB connector 51 is disposed on the side surface. A liquid crystal display device (LCD) 16 and a first speaker 11 as a receiver are arranged on the inner side surface of the display side portion 2, and a camera 24 (see FIG. 2) is arranged on the outer side surface opposite to the inner side surface. The A second speaker 12 is disposed on the side surface of the display side portion 2. Although an example in which the mobile phone 1 includes the LCD 16 is shown here, an organic EL (ElectroLuminescence) display may be used instead of the LCD 16. The operation side unit 3 and the display side unit 2 are rotatably connected by a hinge mechanism, and the operation side unit 3 and the display side unit 2 can be opened and closed.

  FIG. 2 is a functional block diagram illustrating an example of functions of the mobile phone according to the present embodiment. Referring to FIG. 2, mobile phone 1 includes a CPU 21 for controlling the entire mobile phone 1, a radio circuit 22 connected to an antenna 22A, and a codec unit 28 for processing audio data. Microphone 13, first speaker 11 and second speaker 12 connected to codec unit 28, camera 24, operation unit 25 that accepts user operation input, vibration unit 26, and card interface (I / F) 27 A display control unit 30 for controlling the display of the LCD 16, a non-volatile memory 31 for storing a program executed by the CPU 21, a volatile memory 32 used as a work area of the CPU 21, and an external device. A USB connector 51 which is a connection terminal to be connected, a USB driver circuit 53, a power supply control unit 35, and a secondary battery 71. , Including the.

  The radio circuit 22 is controlled by the CPU 21 and communicates with the radio base station. Specifically, a radio signal received by the antenna 22 </ b> A is input, and an audio signal obtained by demodulating the radio signal is output to the codec unit 28. The radio circuit 22 receives the audio signal from the codec unit 28 and outputs a radio signal obtained by modulating the audio signal to the antenna 22A. The codec unit 28 decodes the audio signal input from the radio circuit 22, converts the decoded digital audio signal into analog, amplifies it, and outputs it to the first speaker 11 or the second speaker 12. The codec unit 28 receives an analog audio signal from the microphone 13, converts the audio signal to digital, encodes it, and outputs the encoded audio signal to the radio circuit 22.

  The non-volatile memory 31 is a NAND flash memory, and stores a program executed by the CPU 21 and variables for executing the program. Specifically, a boot program and an application program are stored.

  The volatile memory is a synchronous DRAM (Dynamic Random Access Memory) and is used as a work area of the CPU 21.

  The CPU 21 is activated when a reset signal is input from the activation unit 61 described later. At this time, the CPU 21 executes the boot program stored in the non-volatile memory 31 after startup. The boot program includes a communication setting program, a control program, and an initial setting program. The communication setting program is an input / output port setting process. The control program is a process for controlling the power supply control unit 55. The initial setting program includes a transfer program. In order to cause the CPU 21 to execute a setting program for causing the CPU 21 to execute another setting process for the setting executed in the communication setting process and a process for transferring the application program stored in the nonvolatile memory 31 to the volatile memory 32 Transfer program. The application program is transferred from the nonvolatile memory 31 to the volatile memory 32 because the volatile memory 32 has a higher access speed than the nonvolatile memory 32. After starting, the CPU 21 executes a control program in the boot program, and then executes a transfer program. The time until the boot program execution is completed after startup is referred to as startup time T. When the execution of the boot program is completed, the CPU 21 can execute the application program stored in the volatile memory 32.

  The display control unit 30 is controlled by the CPU 21 and controls the LCD 16 in accordance with an instruction input from the CPU 21 to display an image on the LCD 16. The image displayed on the LCD 16 includes a moving image and a still image.

A removable flash memory 27A is attached to the card I / F 27. The CPU 21 can access the flash memory 27A via the card I / F 27. Here, an example in which a program to be executed by the CPU 21 is stored in the nonvolatile memory 31 will be described. However, the program is stored in the flash memory 27A, and the program is read from the flash memory 27A and executed by the CPU 21. You may make it do. The recording medium for storing the program is not limited to the flash memory 27A, but a flexible disk, cassette tape, optical disk (CD-ROM (Compact Disc)
-ROM) / MO (Magnetic Optical Disc) / MD (Mini Disc) / DVD (Digital Versatile Disc)), IC card, optical card, mask ROM (Read Only Memory ROM), EPROM (Erasable Programmable ROM), EPROM (Erasable Programmable ROM) and Programmable ROM)).

  Alternatively, the mobile phone 1 may be connected to the Internet via the wireless circuit 22 and a program may be downloaded from a computer connected to the Internet and executed by the CPU 21. The program here includes not only a program directly executable by the CPU 21 but also a source program, a compressed program, an encrypted program, and the like.

  The camera 24 includes a lens and a photoelectric conversion element such as a CMOS (Complementary Metal Oxide Semiconductor) sensor, and focuses light collected by the lens on a CMOS sensor. The CMOS sensor photoelectrically converts the received light to convert image data. It outputs to CPU21. The camera 24 is controlled by the CPU 21, starts imaging in response to an instruction from the CPU 21, and outputs the obtained still image data or moving image data to the CPU 21. The camera 24 includes an image processing circuit that executes image processing for improving the image quality of photoelectrically converted image data, and an A / D conversion circuit that converts image data from analog to digital. The CPU 21 outputs the still image data or moving image data output from the camera 24 to the display control unit 30 and displays it on the LCD 16 or encodes the still image data or moving image data by the compression encoding method, and the EEPROM 34 or card I / F is stored in the flash memory 27A attached to the F27.

  The operation unit 25 includes an operation key 14 and a lamp 25A. The operation key 14 receives an operation input by the user and outputs the received operation to the CPU 21. The lamp 25A emits light under the control of the CPU 21.

  A charger 200 or a USB device 210 is connected to the USB connector 51. The USB device 210 is an electronic device that includes a USB connector and can be connected to the mobile phone 1 with a USB cable. The USB device 210 here is a device that can supply power to the mobile phone 1 via a USB cable.

  The USB driver circuit 53 is controlled by the CPU 21 and communicates with the USB device 210 connected via the USB connector 51.

  The secondary battery 71 is a lithium ion battery, a nickel metal hydride battery, a nickel cadmium battery, or the like, and supplies power to the entire mobile phone 1.

  The power supply control unit 35 includes an activation unit 61 for activating the CPU 21, a current control unit 65 for controlling the charging current to the secondary battery 71, and voltage detection for detecting the output voltage of the secondary battery 71. Part 63.

  The voltage detection unit 63 measures the output voltage of the secondary battery 71 and outputs the output voltage of the secondary battery 71 to the device determination unit 67 and the activation unit 61. The device determination unit 67 determines the type of device connected to the USB connector 51 via a USB cable. Here, the USB connector 51 will be described.

  FIG. 3 is a diagram illustrating an example of the USB connector 51. The USB connector 51 includes five terminals of VBUS, D−, D +, NC, and GND. In the charger 200, the D− terminal and the D + terminal are short-circuited, a voltage of, for example, 5V is applied to the VBUS terminal, and the NC terminal is grounded through a resistance of 200 kΩ. On the other hand, in the USB device 210, a predetermined voltage is applied to the VBUS terminal, the D + terminal and the D- terminal are grounded via a 15 kΩ resistor, and the NC terminal becomes an OPEN (open terminal). When the USB device 210 and the mobile phone 1 are connected by a USB cable, communication signals are transmitted / received using the D + terminal and the D− terminal.

  Returning to FIG. 2, the device determination unit 67 is controlled by the CPU 21 and detects which of the charger 200 and the USB device 210 is connected to the USB connector 51. The device determination unit 67 determines whether the D− terminal is the same voltage as the D + terminal or the GND voltage when a predetermined voltage is applied to the D + terminal of the USB connector 51. If the D− terminal has the same voltage as the D + terminal, it is determined that the charger 200 is connected. If the D− terminal is the GND voltage, it is determined that the USB device 210 is connected. When the device determination unit 67 determines that the charger 200 is connected to the USB connector 51, the device determination unit 67 outputs a determination signal indicating that the charger 200 is connected to the CPU 21. When the device determination unit 67 determines that the USB device 210 is connected to the USB connector 51, the device determination unit 67 outputs a determination signal indicating that the USB device 210 is connected to the CPU 21.

  Note that it may be determined which of the charger 200 and the USB device 210 is connected to the USB connector 51 using the NC terminal. The NC terminal of the charger 200 is grounded through a 200 kΩ resistor, and the NC terminal of the USB device 210 is OPEN (open terminal). Therefore, when the current when the voltage is applied to the NC terminal becomes a predetermined value, it is detected that the charger 200 is connected, and when the voltage applied to the NC terminal is detected, the USB device is connected. Detect that.

  The current control unit 65 controls the current of power supplied from the charger 200 or the USB device 210 connected via the USB connector 51. The current control unit 65 is controlled by the CPU 21, but is driven even when the CPU 21 is not operating. When power is supplied from the charger 200 or the USB device 210 connected via the USB connector 51, in other words, when a voltage of 5 V or more is applied to the VBUS terminal, the current control unit 65 has a current of 100 mA. Is output to the secondary battery 71 and a connection signal is output to the starter 61. The connection signal is a signal indicating that either the charger 200 or the USB device 210 is connected to the USB connector 51. In addition, when a switching signal is input from the CPU 21, the current control unit 65 outputs a current greater than 100 mA, for example, a current of 500 mA or more to the secondary battery 71.

  When the connection signal is input, the starter 61 switches the CPU 21 on condition that the voltage value input from the voltage detector 63 (the value of the output voltage of the secondary battery 71) is equal to or higher than the early start voltage V3. to start. If the voltage value input from the voltage detector 63 is less than the early startup voltage V3, the process waits until a voltage value equal to or higher than the early startup voltage V3 is input from the voltage detector 63. The activation unit 61 outputs a reset signal to the CPU 21 in order to activate the CPU 21.

  The early startup voltage V3 is determined by the power consumed by the CPU 21 to execute the communication setting program and the control program in the boot program, and the operating voltage V1. In other words, the startup voltage V3 is a value at which the output voltage of the secondary battery 71 is equal to or higher than the operating voltage V1 even after the CPU 21 executes the communication setting program and the control program in the boot program.

  When the reset signal is input from the activation unit 61, the CPU 21 executes the communication setting program and the control program of the boot program stored in the nonvolatile memory 31.

  FIG. 4 is a diagram for explaining a program stored in the nonvolatile memory. Referring to FIG. 4, the nonvolatile memory 31 stores a boot program 151 and a plurality of application programs 161 and 163. Here, an example is shown in which two application programs 161 and 163 are stored, but the number of application programs to be stored is one or more, and the number of application programs is not limited.

  The boot program 151 includes a communication setting program 153, a control program 155, and an initial setting program 157. The communication setting program 153 defines processing for making settings for the CPU 21 to communicate with the power control unit 55. The control program 155 defines a process for controlling the power supply control unit 55. Specifically, when the CPU 21 controls the device determination unit 67 and the output voltage of the secondary battery 71 is smaller than the simple startup voltage V2, the control program 155 is connected to the USB connector 51 via the charger 200 or the USB device 210. A process of detecting which one is connected and receiving a determination signal from the device determination unit 67 is defined. Further, the control program defines a process of outputting a switching signal to the current control unit 65 when the determination signal indicates that the charging device 210 is connected, and the determination signal indicates that the USB device 210 is connected. In the case shown, a process of waiting until the output voltage of the secondary battery 71 reaches the simple startup voltage V2 is defined. The simple startup voltage V2 is determined by the power consumed by the CPU 21 executing the remaining initial setting program 157 of the boot program 151 and the operating voltage V1. In other words, the simple startup voltage V2 is a value at which the output voltage of the secondary battery 71 is equal to or higher than the operating voltage V1 even after the CPU 21 executes the initial setting program 157 of the boot program 151. When the CPU 21 executes the boot program from the beginning instead of halfway, the simple startup voltage V2 includes the power consumed by the CPU 21 executing all of the boot program 151 and the operating voltage V1. It depends on. In this case, even after the CPU 21 executes all of the boot program 151, the simple startup voltage V2 is determined so that the output voltage of the secondary battery 71 is equal to or higher than the operating voltage V1.

  Returning to FIG. 2, when the device determination unit 67 is controlled to determine the device from the CPU 21, the device 21 outputs a determination signal to the CPU 21, so that the CPU 21 is based on the determination signal input from the device determination unit 67. It is determined which of the charger 200 and the USB device 210 is connected to the USB connector 51. When the determination signal indicates that the charging device 210 is connected, the CPU 21 outputs a switching signal for the current control unit 65. Thereafter, the remaining initial setting program 157 of the boot program 151 is executed. When the switching signal is input from the CPU 21, the current control unit 65 outputs a current of 500 mA larger than 100 mA to the secondary battery 71. For this reason, since the output voltage of the secondary battery 71 does not fall below the operating voltage V1, the mobile phone 1 can be activated.

  On the other hand, when the determination signal indicates that the USB device 210 is connected, the CPU 21 outputs the voltage value output by the voltage detection unit 63 (the value of the output voltage of the secondary battery 71) equal to or higher than the simple startup voltage V2. Wait until. The power consumption in a state where the CPU 21 is on standby is low and can be regarded as zero. For this reason, since a current of 100 mA flows through the secondary battery 71, the storage capacity of the secondary battery 71 increases and the output voltage increases.

  When the voltage value output from the voltage detector 63 (the value of the output voltage of the secondary battery 71) is equal to or higher than the simple startup voltage V2, the CPU 21 executes the remaining initial setting program 157 of the boot program 151 and then executes the USB connector. When a USB device is connected to 51, it communicates with the USB device 210 and negotiates, and then outputs a switching signal to the current control unit 65.

  FIG. 5 is a flowchart illustrating an example of a flow of activation processing executed by the CPU. The activation process is a process executed by the CPU 21 in response to a reset signal input from the activation unit 61. Referring to FIG. 5, when a reset signal is input, CPU 21 executes communication setting program 153 included in boot program 151 (step S01). As a result, the CPU 21 can communicate with the power control unit 51. Then, the control program 155 included in the boot program 151 is executed (step S02). Processing executed by the CPU 21 by executing the control program 155 will be described later. In the next step S03, the initial setting program 157 is executed, and the process proceeds to step S04. The initial setting boot program includes a process of transferring the application programs 161 and 163 stored in the nonvolatile memory 31 to the volatile memory 32.

  In step S04, it is determined whether or not the connected device connected to the USB connector 51 is the charger 200 (step S03). If the charger 200 is connected to the USB connector 51, the process ends. If not, the process proceeds to step S05 if the USB device 210 is connected.

  In step S05, the USB driver circuit 53 is controlled to communicate with the USB device 210 and negotiate to output a power of 500 mA to the USB device 210. Then, the current value is switched (step S06). Specifically, it communicates with the power supply control unit 55 and outputs a switching signal to the current control unit 65. As a result, a power of 500 mA is supplied to the secondary battery 71.

  FIG. 6 is a flowchart illustrating an example of the flow of control processing. The control process is a process executed in step S02 of FIG. Referring to FIG. 6, CPU 21 detects a connected device (step S11). Communicating with the power supply control unit 55 and causing the power supply control unit 55 to detect whether the connected device connected to the USB connector 51 is the charger 200 or the USB device 210. Then, it is determined whether or not the connected device is the charger 200 (step S12). If the connected device is charger 200, the process proceeds to step S13, and if the connected device is not charger 200 but USB device 210, the process proceeds to step S14.

  In step S13, the value of the current flowing through the secondary battery 71 is changed, and the process returns to the startup process. Specifically, a switching signal is output to the current control unit 65 so that a current of 500 mA flows through the secondary battery 71.

  On the other hand, in step S14, the output voltage of the secondary battery 71 is measured. It communicates with the power control unit 55 and causes the power control unit 55 to measure the output voltage of the secondary battery 71. And it is judged whether the output voltage of the secondary battery 71 is more than the simple starting voltage V2 (step S15). If the output voltage of secondary battery 71 is equal to or higher than simple startup voltage V2, the process returns to the startup process. If the output voltage of secondary battery 71 is less than simple startup voltage V2, the process returns to step S14. In other words, it waits until the output voltage of the secondary battery becomes equal to or higher than the simple startup voltage V2. If the output voltage of the secondary battery is equal to or higher than the simple startup voltage V2, the output voltage of the secondary battery 71 will not be lower than the operating voltage V1 even if the remaining initial setting program 157 of the boot program 151 is executed. It is.

  FIG. 7 is a diagram illustrating an example of transition of the output voltage of the secondary battery. At time t0, the output voltage of the secondary battery 71 is an overdischarged voltage. Since power of 100 mA is supplied to the secondary battery 71 from the charger 200 or the USB device 210, the output voltage gradually increases (time 0 to time t1).

  When the output voltage reaches the early startup voltage V3 (time t1), a reset signal is input to the CPU 21, and the CPU 21 executes the communication setting program and the control program in the boot program. Since the power of 100 mA current supplied from the charger 200 or the USB device 210 is smaller than the power consumed when the CPU 21 operates, the secondary battery 71 is discharged and the output voltage decreases. However, after the CPU 21 executes the communication setting program and the control program in the boot program (time t3), the output voltage of the secondary battery 71 is higher than the operating voltage V1. This is because the early startup voltage V3 is set to a value at which the output voltage of the secondary battery 71 is equal to or higher than the operating voltage V1 even after the CPU 21 executes the communication setting program and the control program in the boot program. For this reason, the CPU 21 does not shut down during execution of the communication setting program and the control program in the boot program (period T2).

  When the CPU 21 detects that the charger 200 is connected to the USB connector 51 by executing the communication program and the control program, the CPU 21 controls the current controller 65 to flow a current of 500 mA. For this reason, electric power with a current of 500 mA is supplied to the secondary battery 71. Although a part of the power supplied from the charger 200 is consumed by the CPU 21, the power of the current of 500 mA is larger than the power consumed when the CPU 21 operates, so the output voltage of the secondary battery 71 Will increase. The output voltage of the secondary battery 17 in this case is indicated by a solid line in the drawing. If the time for executing the remaining initial setting program 157 of the boot program in the CPU 21 is T3, the time t4 is reached when the CPU 21 finishes all the execution of the boot program.

  On the other hand, when the CPU 21 detects that the USB device 210 is connected to the USB connector 51 by executing the communication program and the control program, the CPU 21 enters a standby state. In this case, the current control unit 65 supplies power of 100 mA to the secondary battery 71. Since the power consumption in the standby state of the CPU 21 is small, 100 mA current power is supplied from the USB device 210 to the secondary battery 71, and the output voltage gradually increases. The output voltage of the secondary battery 17 when the USB device 210 is connected to the USB connector 51 is indicated by a dotted line in the drawing.

  When the output voltage becomes the simple startup voltage V2 (time t3), the CPU 21 executes the remaining initial setting program 157 of the boot program 151, and the application programs 161 and 163 stored in the nonvolatile memory 31 are executed. A process of transferring to the volatile memory 32 is executed. Since the power of 100 mA current supplied from the USB device 210 is smaller than the power consumed when the CPU 21 operates, the secondary battery 71 is discharged, and the output voltage decreases. However, after the CPU 21 executes the initial setting program 157 (time t5), the output voltage of the secondary battery 71 is higher than the operating voltage V1. This is because the simple startup voltage V2 is set to a value at which the output voltage of the secondary battery 71 becomes equal to or higher than the operating voltage V1 even after the CPU 21 executes the initial setting program 157. For this reason, the CPU 21 executes the initial setting program 157 and shuts down while executing the process of transferring the application programs 161 and 163 stored in the nonvolatile memory 31 to the volatile memory 32 (period T3). There is nothing to do.

  When the CPU 21 finishes executing the initial setting program 157 (time t5), the CPU 21 can communicate with the USB device 210. Therefore, after negotiating with the USB device 210, the current control unit 65 supplies a current of 500 mA. Control is performed so that the secondary battery 71 is supplied. Although a part of the power supplied from the USB device 210 is consumed by the CPU 21, the power of the current of 500 mA is larger than the power consumed when the CPU 21 operates, so the output voltage of the secondary battery 71 Will increase.

  When the charger 200 is connected to the USB connector 51, the CPU 21 can execute the application program at time t4 when the CPU 21 can execute the application program when the USB device 210 is connected to the USB connector 51. It is earlier than time t5. For this reason, it is possible to make the mobile phone 1 usable by connecting the charger 200 earlier than connecting the USB device 210.

  As described above, in the mobile phone 1 according to the present embodiment, the CPU 21 is activated on the condition that the output voltage of the secondary battery 71 is equal to or higher than the early activation voltage V3 higher than the operating voltage V1, and the CPU 21 starts the boot program. Of 151, the communication setting program 153 and the control program 157 are executed. When the CPU 21 that executes the control program detects that the charger 200 is connected to the USB connector 51, the current flowing from the USB connector 51 to the secondary battery 71 changes from 100 mA (first current) to 500 mA (first current). 2nd current). Since the early startup voltage V3 is determined from the power consumed by the CPU 21 and the operating voltage V1 until the execution of the communication setting program 153 and the control program 155 in the boot program 151 after the CPU 21 is activated, the CPU 21 Until the execution of the control program 155 ends, the output voltage of the secondary battery 71 does not become lower than the operating voltage V1. Further, after the current flowing from the USB connector 51 to the secondary battery 71 is switched from 100 mA (first current) to 500 mA (second current), the power exceeding the power consumed by the CPU 21 is secondary from the USB connector 51. Since the power is supplied to the battery 71, the output voltage of the secondary battery 71 does not become lower than the operating voltage V3 after the CPU 21 finishes executing the control program 155. Therefore, the mobile phone 1 can be activated even when the secondary battery 71 is in an overdischarged state.

  Further, since the CPU 21 executes the initial setting program 157 including the transfer program after executing the control program 155, the current flowing from the USB connector 51 to the secondary battery 71 is changed from 100 mA (first current) to 500 mA (second current). ), The initial setting program 157 is executed. For this reason, even if the secondary battery 71 is in an overdischarged state, if the charger 200 is connected to the USB connector 51, the CPU 21 can reliably execute the initial setting program 157.

  Furthermore, since the application program is stored in the volatile memory 32 after the CPU 21 executes the initial setting program 157, the charger 200 can be connected to the USB connector 51 even when the secondary battery 71 is in an overdischarged state. In this case, the CPU 21 can execute an application program.

  Further, when the CPU 21 that executes the control program detects that the USB device 210 is connected without detecting that the charger 200 is connected, the CPU 21 waits until the output voltage of the secondary battery 71 reaches the simple startup voltage V2. To do. The simple startup voltage V2 is determined from the power consumed by the CPU 21 and the operating voltage until the output voltage of the secondary battery 71 finishes the execution of the remaining initial setting program 157 of the boot program 151. The remaining initial setting program 157 of the program 151 can be executed. Therefore, even when the USB device 210 is connected to the USB connector 51, the boot program can be executed to the end, and the mobile phone 1 can be activated.

  In the present embodiment, the current control unit 65 is configured to output a current of 100 mA to the secondary battery 71 when the VBUS terminal becomes +5 V or more. However, the charger connected via the USB connector 51 When it is detected that a current is supplied from 200 or the USB device 210, a current of 100 mA may be output to the secondary battery.

  Needless to say, the invention can be understood as a startup method for executing the startup process shown in FIGS. 5 and 6 and a startup program for causing the computer to execute the startup method.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

<Appendix>
(1) The mobile phone according to claim 1, wherein the start-up voltage is a voltage at which the voltage of the secondary battery becomes equal to or higher than the operating voltage after the execution of the control program is finished after the control means is started up. machine.
(2) The current switching means causes a first current to flow from the input terminal to the secondary battery in response to a voltage being applied to the input terminal, and is controlled by the control means to control the input terminal from the input terminal. The portable device according to claim 1, wherein the second current is passed through the secondary battery.
(3) The portable device according to claim 4, wherein the simple startup voltage is a voltage at which a voltage of the secondary battery becomes equal to or higher than the operating voltage after the control unit finishes executing the boot program.

It is a perspective view which shows the external appearance of the mobile telephone in one of embodiment of this invention. It is a functional block diagram which shows an example of the function of the mobile telephone in this Embodiment. It is a figure which shows an example of a USB connector. It is a figure for demonstrating the program memorize | stored in a non-volatile memory. It is a flowchart which shows an example of the flow of the starting process performed with CPU. It is a flowchart which shows an example of the flow of control processing. It is a figure which shows an example of transition of the output voltage of a secondary battery.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Mobile phone, 2 Display side part, 3 Operation side part, 11 1st speaker, 12 2nd speaker, 13 Microphone, 14 Operation key, 21 CPU, 22 Wireless circuit, 22A Antenna, 24 Camera, 25 Operation part, 25A Lamp , 26 vibration unit, 27 card I / F, 27A flash memory, 28 codec unit, 30 display control unit, 31 nonvolatile memory, 32 volatile memory, 35 power supply control unit, 51 USB connector, 53 USB driver circuit, 55 power supply Control unit, 61 Start-up unit, 62 Threshold change unit, 63 Voltage detection unit, 65 Current control unit, 67 Device discrimination unit, 71 Secondary battery, 200 Charger, 210 USB device

Claims (8)

An input terminal to which an external device can be connected;
A secondary battery that receives a supply of current from an external device connected to the input terminal;
Current control means for controlling current flowing from the input terminal to the secondary battery;
Boot program storage means for storing a boot program including a control program for executing processing for controlling the current control means;
Control means that operates when a voltage higher than the operating voltage is supplied from the secondary battery, and executes the boot program after startup,
Starting means for starting the control means when the output voltage of the secondary battery is higher than the starting voltage higher than the operating voltage,
The control means executes the control program out of the boot programs stored in the storage means after being started by the start means,
The startup voltage is determined from the power consumed by the control unit from the start of the control unit to the end of execution of the control program in the boot program, and the operating voltage.
The control program detecting that a specific external device is connected to the input terminal;
When the detection step does not detect that the specific external device is connected, waiting until the output voltage of the secondary battery becomes a simple startup voltage;
In response to detecting that the specific external device is connected by the detecting step, a current flowing from the input terminal to the secondary battery is increased from the first current to the current control means to be larger than the first current. Switching to the second current, causing the control means to execute ,
The simple starting voltage, the electric power and the control means is consumed by the control unit before terminating the execution of the boot program, that Sadama from said operating voltage, the portable device. The storage means is a nonvolatile memory,
Aside from the storage means, further comprising volatile work storage means used as a work area of the control means,
The boot program further includes a transfer program for causing the control unit to execute a process of transferring the application program stored in the storage unit to the working storage unit,
The portable device according to claim 1, wherein the control unit executes the transfer program after executing the control program.   The portable device according to claim 2, wherein the control unit executes the application program stored in the storage unit. The activation voltage, after the control unit has completed the execution of the control program after starting, the voltage of the secondary battery is a voltage which becomes the operating voltage or more, according to any one of claims 1 to 3 Mobile devices. The portable device according to any one of claims 1 to 4, wherein the simple startup voltage is a voltage at which a voltage of the secondary battery becomes equal to or higher than the operating voltage after the control unit finishes executing the boot program. . The current switching means causes a first current to flow from the input terminal to the secondary battery in response to a voltage being applied to the input terminal, and is controlled by the control means to control the secondary battery from the input terminal. flowing the second current to the portable device according to any one of claims 1-5. A startup method executed on a mobile device,
The portable device is
An input terminal to which an external device can be connected;
A secondary battery that receives a supply of current from an external device connected to the input terminal;
Current control means for controlling current flowing from the input terminal to the secondary battery;
Storage means for storing application programs;
Boot program storage means for storing a boot program including a control program and a transfer program for executing processing for controlling the current control means;
Control means that operates when a voltage higher than the operating voltage is supplied from the secondary battery, and executes the boot program after startup,
Starting means for starting the control means when the output voltage of the secondary battery is equal to or higher than the starting voltage higher than the operating voltage;
Working storage means used as a work area of the control means,
The startup voltage is determined from the power consumed by the control unit from the start of the control unit to the end of execution of the control program in the boot program, and the operating voltage.
The control program performs a setting for communicating with the current control means;
Detecting whether a specific external device is connected to the input terminal;
When the detection step does not detect that the specific external device is connected, waiting until the output voltage of the secondary battery becomes a simple startup voltage;
In response to detecting that the specific external device is connected by the detection step, the current flowing from the input terminal to the secondary battery from the first current to the current control means is changed from the first current to the current control means. Causing the control means to execute a step of switching to a second current having a large value,
The transfer program causes the control means to execute a step of transferring the application program to the working storage means after the control program is executed.
The simple start voltage is a start method determined from the power consumed by the control means while the control means executes the transferring step and the operating voltage. A boot program executed on a mobile device,
The portable device is
An input terminal to which an external device can be connected;
A secondary battery that receives a supply of current from an external device connected to the input terminal;
Current control means for controlling current flowing from the input terminal to the secondary battery;
Storage means for storing application programs;
Boot program storage means for storing a boot program including a control program and a transfer program for executing processing for controlling the current control means;
Control means that operates when a voltage higher than the operating voltage is supplied from the secondary battery, and executes the boot program after startup,
Starting means for starting the control means when the output voltage of the secondary battery is equal to or higher than the starting voltage higher than the operating voltage;
Working storage means used as a work area of the control means,
The startup voltage is determined from the power consumed by the control unit from the start of the control unit to the end of execution of the control program in the boot program, and the operating voltage.
The control program performs a setting for communicating with the current control means;
Detecting whether or not a specific external device is connected to the input terminal by the detecting step;
When the detection step does not detect that the specific external device is connected, waiting until the output voltage of the secondary battery becomes a simple startup voltage;
In response to detecting that the specific external device is connected by the detection step, the current flowing from the input terminal to the secondary battery from the first current to the current control means is changed from the first current to the current control means. Causing the control means to execute a step of switching to a second current having a large value,
The transfer program causes the control means to execute a step of transferring the application program to the working storage means after the control program is executed.
The simple startup voltage is a boot program determined from the power consumed by the control means while the control means executes the transferring step and the operating voltage.

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