JP2008140234A - Electronic device, control method therefor and program therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To store data to be backed up when a power source fails regardless of power consumed by a power consumption device connected to the own device while suppressing increase of cost or scale of a device. <P>SOLUTION: In a printer 10, a switch 35 is provided in electric wiring 34 supplying power supplied from the commercial AC power source 13 to a built-in CD/DVD drive device 32 or a print mechanism 50 through a power supply line 16 or the like, and a capacitor 17 is connected to the power supply line 16. In the printer 10, when a power failure occurrence signal is outputted from a power failure detection sensor 28 by a stop of the supply of the power from the commercial AC power source 13, a main controller 20 uses electronic energy stored in the capacitor 17 through a DC/DC converter 37, controls the switch 35 to cut off the electric wiring 34, and stores the data to be backed up in EEPROMs 36, 58. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electronic device, a control method thereof, and a program thereof.

Conventionally, computers that perform pause processing are known. For example, the computer described in Patent Document 1 includes a simple backup power source and an auxiliary power source that are used in the event of a power failure. When a power failure occurs, the computer ends processing of the program and data in the main storage unit by a power supply from the simple backup power source. And a process for writing the data written in the high-speed buffer to the nonvolatile memory device by the power supply from the auxiliary power supply. The power supply from the simple backup power supply is stopped when the program termination process or the process of writing to the high-speed buffer is completed, and the power supply from the auxiliary power supply is stopped when the process of writing to the nonvolatile storage device is completed. Stop. If the power backup time and current consumption are short, a large-capacity capacitor may be used as a simple backup power supply or auxiliary power supply.
JP 2004-348641 A

  By the way, it is conceivable to connect a power consuming device such as a CD-R drive to such a computer.

  However, as a simple backup power source, for example, when a large-capacity capacitor is used, when a power consuming device is connected and the power consuming device consumes energy stored in the capacitor at the time of a power failure, it is stored in the capacitor In some cases, energy alone is insufficient. In this case, the process of writing the data in the main storage unit into the high-speed buffer cannot be executed normally. Further, if a power supply device having a sufficient capacity such as an uninterruptible power supply device or a capacitor with a larger capacity is used for the connected power consuming device, the size of the device and the cost increase will be caused. .

  The present invention has been made in view of the above-described problems, and when a power supply abnormality occurs regardless of the power consumed by the power consuming device connected to itself while suppressing the increase in size and cost of the device. An object is to provide an electronic device capable of storing data to be backed up, a control method thereof, and a program thereof.

  The electronic device, the control method thereof, and the program thereof of the present invention employ the following means in order to achieve at least a part of the above-described object.

The electronic device of the present invention is
Non-volatile memory that can store data,
First DC voltage generating means for inputting a predetermined DC voltage directly or indirectly from a power supply, converting it to a first DC voltage, and outputting the first DC voltage;
Control means driven by the first DC voltage output from the first DC voltage generating means;
A capacitor connected between the power source and the first DC voltage generating means and charged by applying the predetermined DC voltage;
Connecting means connected in parallel to the capacitor between the power source and the first DC voltage generating means, and capable of supplying power to a power consuming device;
Switching means capable of connecting / disconnecting electrical wiring between the power source and the first DC voltage generating means to the connecting means;
With
When an abnormality occurs in the power source, the control means uses the electric energy stored in the capacitor via the first DC voltage generating means to control the switching means so that the electric wiring is disconnected. In addition, data to be backed up is stored in the nonvolatile memory.

  In this electronic apparatus, when an abnormality occurs in the power supply, the control means uses the electrical energy stored in the capacitor via the first DC voltage generating means to control the switching means so that the electric wiring is disconnected. At the same time, data to be backed up is stored in a nonvolatile memory. Thus, after the electrical wiring is cut, the power consuming device connected to the connection means does not consume power. For this reason, the capacitor only needs to store electrical energy that can store data to be backed up in the nonvolatile memory. Therefore, it is possible to save data to be backed up when a power supply abnormality occurs regardless of the power consumed by the power consuming device connected to the device while suppressing the increase in size and cost of the device.

  In the electronic apparatus of the present invention, the control means may be configured such that an abnormality has occurred in the power supply when the predetermined DC voltage falls below a predetermined first lower limit value. In this way, it is possible to reliably detect that an abnormality has occurred in the power supply. The predetermined first lower limit value may be set to a value that cannot be taken when the power supply from the power source is continued, for example.

  The electronic device of the present invention is provided between the power source and the first DC voltage generating means, and receives a second DC voltage lower than the predetermined DC voltage from the power source and boosts the predetermined DC voltage to the predetermined DC voltage. Predetermined voltage generating means for outputting to the first DC voltage generating means, and the control means may have an abnormality in the power supply when the second DC voltage falls below a predetermined second lower limit value. . When an abnormality occurs in the power supply and the second DC voltage changes, the predetermined DC voltage also changes, but the predetermined DC voltage is applied to the output side of the predetermined voltage generating means until the abnormality occurs, and charges are stored. Since the capacitor is connected, the rate of change of the predetermined DC voltage is slower than the rate of change of the second DC voltage. Therefore, it is possible to quickly and surely detect that an abnormality has occurred in the power supply, as compared with the case where an abnormality in the power supply is detected based on a predetermined DC voltage. The predetermined second lower limit value may be set to a value that cannot be taken when the power supply from the power source is continued, for example.

  In the electronic apparatus of the present invention, the switching means may be a switch using a transistor. In this way, the electrical wiring can be disconnected earlier when a power supply abnormality occurs than when a mechanical relay is used.

  The electronic apparatus of the present invention includes a printing unit that performs printing, and the printing unit includes a power line of the printing unit that is connected in parallel to the power consuming device between the switching unit and the power consuming device. It may be a means. In this way, when an abnormality occurs in the power source, the power supply to the printing unit can be stopped when the electrical wiring is cut by the switching unit.

The control method of the present invention is a control method by computer software of an electronic device including a capacitor that is charged by a predetermined DC voltage applied directly or indirectly from a power source,
(A) determining whether an abnormality has occurred in the power source;
(B) When it is determined in step (a) that an abnormality has occurred in the power source, the electrical energy stored in the capacitor is converted into a first DC voltage lower than the predetermined DC voltage. Disconnecting the electrical connection for supplying power to the power consuming device connected to the electronic device while using it and storing the data to be backed up in a nonvolatile manner;
Is included.

  In this electronic device control method, it is determined whether or not an abnormality has occurred in the power source. When it is determined that an abnormality in the power source has occurred, the electric energy stored in the capacitor is a first voltage lower than a predetermined DC voltage. While being used in the state of being converted into a DC voltage, the electrical connection for supplying power to the power consuming device connected to the electronic device is disconnected and the data to be backed up is stored in a nonvolatile manner. Thus, after the electrical connection is cut, the power consuming device connected to the electronic device does not consume power. For this reason, the capacitor only needs to store electrical energy that can store data to be backed up in a nonvolatile manner. Therefore, it is possible to save data to be backed up when a power supply abnormality occurs regardless of the power consumed by the power consuming device connected to the electronic device, while suppressing the increase in size and cost of the device. In addition, you may add the step for implement | achieving the effect | action and function show | played by the various structures with which the electronic device of this invention mentioned above is equipped.

  The program of the present invention is for causing one or more computers to execute each step of the control method described above. This program may be recorded on a computer-readable recording medium (for example, hard disk, ROM, FD, CD, DVD, etc.), or from a computer via a transmission medium (communication network such as the Internet or LAN). It may be distributed to another computer, or may be exchanged in any other form. If this program is executed by one computer or distributed to a plurality of computers, each step of the above-described control method is executed, so that the same effect as that of the above-described control method can be obtained.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing an outline of a configuration of a printer 10 which is an embodiment of an electronic apparatus of the present invention.

  As shown in FIG. 1, the printer 10 of the present embodiment includes a power supply unit 12 connected to a commercial AC power supply 13 and a printer main body 18 incorporating a print mechanism 50.

  The power supply unit 12 converts the AC voltage from the commercial AC power supply 13 into a DC voltage of 20 V by the AC / DC converter 14, and further boosts the DC voltage to 42 V by the DC / DC converter 15. The power is supplied to the printer main body 18 through the power supply line 16. Inside the power supply unit 12, a capacitor 17 is connected to the power supply line 16 for removing unnecessary vibration of the voltage waveform to make a smooth waveform. The capacitor 17 is charged by a voltage applied to the power supply line 16 when power is supplied from the commercial AC power supply 13. For example, when the power supply from the commercial AC power supply 13 is stopped, the electric energy stored in the capacitor 17 is supplied to the printer main body 18 via the power supply line 16, so that the capacitor 17 is discharged. The voltage between the two electrodes decreases with time. The capacity of the capacitor 17 is determined in consideration of the time required for the main controller 20 to be described later to write data to be backed up in the EEPROMs 36 and 58 and the current consumption at that time. Here, for example, the capacity is determined so that the main controller 20 and the EEPROMs 36 and 58 can operate for 300 ms. The AC voltage of the commercial AC power supply 13 is 100V or 200V.

  The printer main body 18 supplies a DC voltage of 42 V to the print mechanism 50 that is driven by being supplied with a DC voltage of 42 V via the power supply line 16 and the built-in CD / DVD drive device 32 that is driven by being supplied with a DC voltage of 5 V. A DC / DC converter 33 that converts and supplies a DC voltage of 5V, an electric wiring 34 that branches from the branch point A of the power supply line 16 and transmits the DC voltage to the DC / DC converter 33 and the printing mechanism 50, A switch 35 capable of connecting / disconnecting the wiring 34, a main controller 20 for performing data writing to the EEPROMs 36, 58, which are nonvolatile memories, and turning on / off of the switch 35 with a 3.3 V DC voltage supplied thereto, 42V DC voltage is converted to 3.3V DC voltage and supplied to main controller 20, EEPROM 36, 58, etc. And a C / DC converter 37.

  The print mechanism 50 is disposed inside the printer main body 18, is driven by a timing belt 51 that is looped in the left-right direction, and is reciprocated left and right along a guide 52. The print mechanism 50 is mounted on the carriage 53. An ink cartridge 54 that individually stores ink of each color such as cyan, magenta, yellow, and black, and a print head that discharges ink from the nozzle toward the paper P by applying pressure to each ink supplied from each ink cartridge 54 55 and a transport roller 56 for feeding the fed paper P to a front discharge tray (not shown). Here, the print head 55 employs a method in which a voltage is applied to the piezoelectric element to deform the piezoelectric element and pressurize the ink. However, a voltage is applied to a heating resistor (for example, a heater) to heat the ink. A method of pressurizing the ink with the generated bubbles may be employed. In the print mechanism 50, a 42 V DC voltage from the electrical wiring 34 is supplied to a motor that rotates the conveyance roller 56, a motor that rotates the timing belt 51, a drive circuit that drives the print head 55, and the like.

  The DC / DC converter 33 inputs a direct current voltage of 42 V from the electrical wiring 34, steps down to a direct current voltage of 5 V, and outputs it to the built-in CD / DVD drive device 32. The built-in CD / DVD drive device 32 can write data to a writable medium such as a CD-R or a DVD-R inserted in the built-in CD / DVD drive device. The built-in CD / DVD drive device 32, for example, stores a file stored in a memory card inserted in a memory card reader / writer (not shown) mounted on the printer 10 into a CD-R inserted in the built-in CD / DVD drive device 32. Or when backing up to a recording medium such as DVD-R.

  The switch 35 is provided on the wiring of the electrical wiring 34, and its on / off is controlled by the main controller 20. The switch 35 uses, for example, an FET. When the voltage of the control signal from the main controller is applied to the gate electrode, the switch is turned off and no current flows, and the DC / DC converter 33 or the printing mechanism is used. The supply of DC voltage to 50 is stopped. The switch 35 can be turned off earlier than when a mechanical relay is used, and the time is approximately 40 μs to 50 μs.

  The DC / DC converter 37 receives a 42V DC voltage from the electrical wiring branched at the branch point A of the power supply line 16, steps down to a 3.3V DC voltage, and outputs it to the main controller 20 and the EEPROMs 36 and 58. is there. The EEPROM 36 is a non-volatile memory mounted inside the printer main body 18, and the EEPROM 58 is a non-volatile memory mounted on the IC chip 57 of the ink cartridge 54 of the printer mechanism 50. Written.

  The main controller 20 is configured as a microprocessor centered on the CPU 22. A ROM 24 that stores various processing programs and various data, a RAM 26 that temporarily stores data, and a power failure when the voltage of the power supply line 16 decreases. And a power supply abnormality detection sensor 28 that outputs a generation signal. The power supply abnormality detection sensor 28 inputs a DC voltage of the power supply line 16 through an A / D conversion circuit (not shown) and compares it with a predetermined lower limit voltage Vref. Then, a power failure occurrence signal, which is an interrupt signal (NMI (Non Maskable Interrupt)), is output when the DC voltage of the power supply line 16 falls below the lower limit voltage Vref as a trigger. The main controller 20 writes data to be backed up in the EEPROM 36 mounted on the printer main body 18, writes the remaining ink amount as a part of the data in the EEPROM 58 mounted on the IC chip 57 of the ink cartridge 54, and the switch 35 is controlled to connect / disconnect the electric wiring 34. The main controller 20 may be an SOC (system on a chip) by mounting the CPU 22 and the like on one chip. The lower limit voltage Vref may be set to a value that cannot be obtained when the power supply unit 12 is normal, and may be set to 37V or 38V, for example.

  Next, the operation of the printer 10 of this embodiment configured as described above will be described.

  FIG. 2 is a flowchart illustrating an example of a power management process routine executed by the CPU 22 of the printer 10. This routine is stored in the ROM 24 of the printer 10. This routine is executed when the printer 10 is powered on. When this routine is executed, the CPU 22 of the printer 10 first determines whether or not a power failure occurrence signal is output from the power supply abnormality detection sensor 28 (step S100). When the power failure occurrence signal is not output, since the power is normally supplied from the commercial AC power supply 13, the process of step S100 is executed again.

  On the other hand, when it is determined in step S100 that a power failure occurrence signal has been output, the switch 35 is controlled so that the electrical wiring 34 is disconnected (step S110), and the data to be backed up is read from the RAM 26 and written to the EEPROMs 36 and 58. (Step S120). Data transfer from the RAM 26 to the EEPROMs 36 and 58 is performed by a method that does not require time for data transfer such as burst transfer, for example. Thereafter, this routine is terminated. Actually, the interrupt signal NMI is an interrupt signal that is always generated when a trigger is applied. Therefore, immediately after detecting a power failure, the CPU 22 makes an affirmative determination in step S100 and executes the process of step S110. Here, the switch 35 is controlled so that the electrical wiring 34 is disconnected. The electrical energy stored in the capacitor 17 is stored in the built-in CD / DVD via the DC / DC converter 33 when the electrical wiring 34 remains connected. This is because it is consumed by the drive device 32. By cutting the electrical wiring 34 in this way, the electrical energy stored in the capacitor 17 is consumed only by the main controller 20 and the EEPROMs 36 and 58 via the DC / DC converter 37, and data to be backed up is stored. It is possible to avoid a situation where the electric energy necessary for writing to the EEPROMs 36 and 58 is insufficient. Here, the data to be backed up is data that is temporarily stored in the RAM 26 and is lost when the power supply to the main controller 20 is stopped. The data written in the EEPROM 36 includes, for example, the heat generation status of each part of the print mechanism 50, the energization time of the printer 10, the unique information of the mechanism of the print mechanism 50, the unique information of the print head 55, the error code, and the like. Examples of data written to the EEPROM 58 include the remaining ink amount of the ink cartridge 54. Note that the CPU 22 can execute other processes such as a process of executing printing even when the power management process routine shown in FIG. 2 is executed and the process of step S100 is repeatedly executed.

  A case where the power supply from the commercial AC power supply 13 is stopped during the execution of the power management process routine of FIG. 2 will be described with reference to FIG. FIG. 3 is a graph showing an example of the time change of the DC voltage of the power supply line 16. When the power supply from the commercial AC power supply 13 is stopped, that is, when a power failure occurs, the electric energy stored in the capacitor 17 is consumed by the printer main body 18, so that the DC voltage of the power supply line 16 is accompanied by the discharge of the capacitor 17. Decrease. Then, the occurrence of a power failure is detected by the power supply abnormality detection sensor 28 when it falls below a predetermined lower limit voltage Vref. Then, a power failure occurrence signal that is an interrupt signal is output from the power supply abnormality detection sensor 28, and the CPU 22 controls the switch 35 so that the electrical wiring 34 is disconnected. As a result, power is not consumed by the print mechanism 50, the built-in CD / DVD drive device 32, etc., and the time constant of the decrease of the DC voltage of the power supply line 16 changes (see point B in FIG. 3). The DC voltage of the current decreases more slowly. Therefore, the time during which the main controller 20 and the like can operate is extended. And CPU22 backs up the data which should be preserve | saved in the meantime.

  Here, the correspondence between the components of the present embodiment and the components of the present invention will be clarified. The EEPROMs 36 and 58 of the present embodiment correspond to the nonvolatile memory of the present invention, the DC / DC converter 37 corresponds to the first DC voltage generation means, the main controller 20 corresponds to the control means, and the capacitor 17 corresponds to the capacitor. The electrical wiring 34 corresponds to connection means, and the switch 35 corresponds to switching means. Further, the DC / DC converter 15 corresponds to a predetermined DC voltage generating unit, and the printing mechanism 50 corresponds to a printing unit. Further, the commercial AC power supply 13 corresponds to the power supply, the DC voltage of 42V corresponds to the predetermined voltage, the DC voltage of 3.3V corresponds to the first DC voltage, and the DC voltage of 20V becomes the second DC voltage. Equivalent to. In the present embodiment, an example of the electronic device control method of the present invention is also clarified by describing the operation of the printer 10.

  According to the printer 10 of the present embodiment described in detail above, when the supply of power from the commercial AC power supply 13 is stopped and a power failure occurrence signal is output from the power supply abnormality detection sensor 28, the main controller 20 is connected to the capacitor 17. The stored electrical energy is used through the DC / DC converter 37 to control the switch 35 so that the electrical wiring 34 is disconnected and to store data to be backed up in the EEPROMs 36 and 58. Thus, after the electrical wiring 34 is cut, the built-in CD / DVD drive device 32 and the print mechanism 50 connected via the electrical wiring 34 do not consume power. For this reason, the capacitor 17 only needs to store electrical energy that can store data to be backed up in the EEPROMs 36 and 58. Therefore, when an abnormality occurs in the commercial AC power supply 13 regardless of the power consumed by the built-in CD / DVD drive device 32 and the print mechanism 50 connected to the printer 10 while suppressing the increase in size and cost of the printer 10. Data to be backed up can be stored in the EEPROMs 36 and 58.

  Further, since the main controller 20 determines that the power supply from the commercial AC power supply 13 has stopped when the DC voltage of the power supply line 16 falls below a predetermined lower limit value, it indicates that an abnormality has occurred in the commercial AC power supply 13. It can be detected reliably. Furthermore, since the switch 35 is a switch using an FET, the electrical wiring 34 can be disconnected earlier when an abnormality occurs in the commercial AC power supply 13 than when a mechanical relay is used.

  It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  For example, in the above-described embodiment, the main controller 20 determines that the power supply is stopped when the DC voltage of the power supply line 16 falls below a predetermined lower limit value, but instead of or in addition to the DC / It may be determined that the power supply is stopped when the DC voltage on the input side of the DC converter 15 falls below a predetermined threshold. When the power supply of the commercial AC power supply 13 stops and the voltage on the input side of the DC / DC converter 15 decreases, the voltage of the power supply line 16 also decreases, but the power supply is stopped on the output side of the DC / DC converter 15. Since the capacitor 17 that has been charged with the DC voltage and stores the charge is connected, the rate of decrease of the DC voltage of the power supply line 16 is slower than the rate of decrease of the DC voltage on the input side of the DC / DC converter 15. . Therefore, compared with the case where the power supply stop of the commercial AC power supply 13 is detected based on the voltage of the power supply line 16, it can be detected quickly and reliably that the power supply of the commercial AC power supply 13 is stopped. The predetermined threshold value may be set to a value (for example, 17V, 18V, etc.) that cannot be taken when the power supply from the commercial AC power supply 13 is continued. Here, the predetermined threshold corresponds to the second lower limit value of the present invention.

  In the above-described embodiment, the built-in CD / DVD drive device 32 and the printer mechanism 50 are connected downstream of the switch 35, but other devices are connected in addition to or instead of them. It may be a thing. For example, a USB device connected using a DC voltage stepped down by an appropriate DC / DC converter from an electrical wiring branched from between the switch 35 and the DC / DC converter 33 in the electrical wiring 34 consumes power. It may be a thing. Even in such a case, when the electrical connection of the electrical wiring 34 is disconnected by the main controller 20, the USB device does not consume power, so the main controller 20 should back up regardless of the power consumed by the USB device. Data can be written to the EEPROM 36,58. In this case, a USB port for connecting a USB device, a USB controller, and the like are provided.

  In the above-described embodiment, power is supplied from the commercial AC power supply 13, but the power supply is not limited to the commercial AC power supply 13. For example, it may be one or a plurality of batteries capable of outputting a DC voltage of 20V. In this case, the AC / DC converter 14 is not necessary.

  In the above-described embodiment, the switch using the FET is used. However, any switch may be used as long as the electrical wiring 34 can be connected / disconnected. For example, a transistor other than the FET may be used.

  In the above-described embodiment, the full-color printer 10 using the ink jet method and using the ink as the colorant is used. However, the electrophotographic method is used and the toner is used as the colorant and data is written to the storage element provided in the toner cartridge. A color laser printer or a color printer that employs a thermal transfer system and uses an ink ribbon as a colorant and similarly includes a storage element may be used. Also, a printing apparatus such as a FAX machine or a copier may be used.

1 is a schematic configuration diagram of a printer 10. FIG. The flowchart which shows an example of a power management process routine. 6 is a graph showing an example of a time change of a DC voltage of the power supply line 16.

Explanation of symbols

  10 Multifunction Printer, 12 Power Supply Unit, 13 Commercial AC Power Supply, 14 AC / DC Converter, 15 DC / DC Converter, 16 Power Supply Line, 17 Capacitor, 18 Printer Main Body, 20 Main Controller, 22 CPU, 24 ROM, 26 RAM 28, power supply abnormality detection sensor, 32 built-in CD / DVD drive device, 33 DC / DC converter, 34 electrical wiring, 35 switch, 36 EEPROM, 37 DC / DC converter, 50 printing mechanism, 51 timing belt, 52 guide, 53 carriage , 54 ink cartridge, 55 print head, 56 transport roller, 57 IC chip, 58 EEPROM, P paper.

Claims (7)

Non-volatile memory that can store data,
First DC voltage generating means for inputting a predetermined DC voltage directly or indirectly from a power supply, converting it to a first DC voltage, and outputting the first DC voltage;
Control means driven by the first DC voltage output from the first DC voltage generating means;
A capacitor connected between the power source and the first DC voltage generating means and charged by applying the predetermined DC voltage;
Connecting means connected in parallel to the capacitor between the power source and the first DC voltage generating means, and capable of supplying power to a power consuming device;
Switching means capable of connecting / disconnecting electrical wiring between the power source and the first DC voltage generating means to the connecting means;
With
When an abnormality occurs in the power source, the control means uses the electric energy stored in the capacitor via the first DC voltage generating means to control the switching means so that the electric wiring is disconnected. And storing data to be backed up in the nonvolatile memory,
Electronics. When the predetermined DC voltage falls below a predetermined first lower limit value, the control means has an abnormality in the power supply.
The electronic device according to claim 1. The electronic device according to claim 1,
Provided between the power supply and the first DC voltage generation means, and inputs a second DC voltage lower than the predetermined DC voltage from the power supply and boosts the DC voltage to the predetermined DC voltage to generate the first DC voltage A predetermined voltage generating means for outputting to the means,
The control means has an abnormality in the power supply when the second DC voltage falls below a predetermined second lower limit value.
Electronics. The switching means is a switch using a transistor,
The electronic device in any one of Claims 1-3. The electronic device according to claim 1,
Printing means for performing printing,
The printing unit is a unit in which a power line of the printing unit is connected in parallel to the power consuming device between the switching unit and the power consuming device.
Electronics. A control method by computer software of an electronic device including a capacitor that is charged by a predetermined DC voltage applied directly or indirectly from a power source,
(A) determining whether an abnormality has occurred in the power source;
(B) When it is determined in step (a) that an abnormality has occurred in the power source, the electrical energy stored in the capacitor is converted into a first DC voltage lower than the predetermined DC voltage. Disconnecting the electrical connection for supplying power to the power consuming device connected to the electronic device while using it and storing the data to be backed up in a nonvolatile manner;
Control method.   A program for causing each step of the control method according to claim 6 to be realized by one or more computers.

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