JP5799572B2 - Electronic equipment, control method - Google Patents

Description

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

  In a conventional image forming apparatus, a main power supply (commercial power supply) is input, and a plurality of power supplies (24 V, 5 V, 3.3 V, etc. in this example) are generated from the main power supply and used inside the image forming apparatus. When the user turns off the main power supply by turning off the switch, the supply of the plurality of power supplies is also shut off. In preparation for such a case, for example, an image forming apparatus that holds important data such as FAX data may have a time difference in voltage drop timings of the plurality of power supplies when the main power supply is shut off.

  For example, when the main power supply is turned off, the CPU that executes the main control operates at 3.3 V so that the 3.3 V power supply voltage drops after the timing when the 5 V power supply voltage drops. There is an image forming apparatus having a configuration. In such an image forming apparatus, the CPU detects that the main power supply has been turned off due to a drop in the voltage of the 5V power supply, and uses and holds the time until the voltage of the 3.3V power supply drops. The FAX data is saved in the memory (for example, see Patent Document 1).

  However, when the main power is turned on by a user operation or the like, the power is turned off and turned on in a short time (for example, about 0.1 second) (hereinafter referred to as “the main power is momentarily cut off”). There is. In many cases, a rocker switch is used as a main power switch of an image forming apparatus, and the main power supply is often momentarily cut off by a user operation. Even if an instantaneous power failure occurs, the main power supply is cut off instantaneously.

  When the main power supply is momentarily cut off, the voltage of the 5V power supply drops instantaneously, but the voltage of the 3.3V power supply for operating the CPU does not drop and continues to be supplied stably. When the voltage of the 5V power supply is lowered, the CPU determines that the commercial power supply is cut off, saves FAX data and the like in the memory, and waits until all the power supply is cut off. However, in actuality, the voltage of the 3.3V power supply continues to be supplied to the CPU, and the CPU continues to wait until all the power supply is cut off, so that the image forming apparatus stops its operation. There is.

  In view of such a problem, the present invention provides an electronic device that appropriately determines whether or not the main power supply is momentarily interrupted.

In order to achieve the above object, power generation means for generating a plurality of power supplies from a main power supply and varying the voltage drop timing of each of the plurality of power supplies when the main power is turned off,
A first control unit that is supplied with a second power source that is later in the lowering timing than the first power source that has the earliest lowering timing when the main power source is turned off among the plurality of power sources;
A second control unit that performs a control other than the control performed by the first control unit , includes a transmission unit that is supplied with the first power supply and that can transmit state information indicating normality or abnormality of itself to the first control unit; An electronic device having a control unit,
The first controller is
The main control in the electronic device is performed,
When the main power supply is turned off, a drop in the voltage of the first power supply is detected, and re-supply of the first power supply is detected while the second power supply is being supplied. The power supply has detection means for determining that the power supply has been interrupted,
The detecting means detects the supply of the first power supply or the voltage drop of the first power supply, and detects normality or abnormality of the second control unit by receiving the state information. Provide electronic equipment.

  If it is the electronic device of this invention, it can be judged appropriately whether the main power supply was cut off momentarily.

1 is a diagram illustrating a functional configuration example of an image forming apparatus according to a first exemplary embodiment (part 1); The figure which showed supply of 1st power supply when a main power supply was turned off, and supply of 2nd power supply, and a fall. The figure which showed supply of 1st power supply when a main power supply was interrupted, and supply of 2nd power supply, and a fall. FIG. 2 is a diagram (part 1) illustrating a main processing flow of the image forming apparatus according to the present exemplary embodiment. FIG. 2 is a diagram illustrating an example of a functional configuration of an image forming apparatus according to the present exemplary embodiment (part 2). FIG. 2 is a diagram illustrating a main processing flow of the image forming apparatus according to the present exemplary embodiment (No. 2).

The electronic apparatus of this embodiment is, for example, an image forming apparatus, but may be another electronic apparatus as long as it operates with a supplied power. Hereinafter, a case where the electronic apparatus is an image forming apparatus will be described.
[Embodiment 1]
First, the image forming apparatus of Embodiment 1 will be described. FIG. 1 illustrates a functional configuration example of the image forming apparatus 150 according to the first embodiment. The image forming apparatus 150 is connected to the main power source 1, and when the switch unit 2 is turned on by the user, the main power source is supplied into the image forming apparatus 150 and the switch unit 2 is turned off by the user. The main power supply is cut off in the image forming apparatus 150. In the following, it is said that the main power is supplied to the image forming apparatus 150 and that the main power is turned on, and that the main power is not supplied to the image forming apparatus 150 (the supply is cut off). It is said that.

  When the switch means 2 is turned on by the user, the AC main power is supplied to the conversion branch means 4. The conversion / branching unit 4 converts the supplied AC main power into DC and further branches the power into at least two power sources. In this example, the conversion branching unit 4 branches the main power source into a first power source and a second power source, but a power source other than the first power source and the second power source (that is, the third power source, the fourth power source,...). You may also branch off. The first power is supplied to a device other than the first control unit 20 (described as another device 60 in FIG. 1). The other device 60 is operated by a power source other than the first control unit 20. The other device 60 is, for example, a recording head or a scanner (both not shown).

  The second power supply is supplied to the delay means 6 (delay circuit). The delay means 6 delays the supplied power and outputs it. Therefore, the second power source supplied to the delay means 6 is output after being delayed from the first power source.

  In addition, the detection unit 24 determines whether the voltage of the first power source supplied to the other device 60 has dropped, or whether the first power source is supplied to the other device 60 (whether it has dropped). It can be detected. Similarly, the detection unit 24 detects whether the voltage of the second power source supplied to the first CPU 22 has dropped or whether the second power source has been supplied to the first CPU 22 (whether it has dropped). I can do it. The detection of the first power supply will be specifically described. The detection means 24 measures the voltage value of the first power supply flowing through the first power supply system. When the voltage value of the first power supply is a predetermined value (hereinafter referred to as an operation supply value), or when the voltage value of the first power supply is equal to or greater than a predetermined threshold value, the first power supply Is supplied to another device 60. If the voltage value of the first power supply is not the operation supply value, or if the voltage value of the first power supply is less than the threshold value, it is determined that the voltage of the first power supply has dropped. Moreover, the detection means 24 can also detect the drop / supply of the voltage of the second power supply by the same method.

  Further, the operation supply value is a voltage value supplied for proper operation of the other devices 60 and the first control unit 20 when the main power supply is turned on. The operation supply value for the first power supply (that is, the operation supply value for the other device 60, which is referred to as the first operation supply value) is 3.3 V, and the operation supply value for the second power supply (that is, the first operation supply value). , Which is an operation supply value for the first controller 20 and is referred to as a second operation supply value). The threshold value is set to a value slightly smaller than the operation supply value.

  The second power output from the delay means 6 is supplied to the first CPU 22. The first CPU 22 is operated by the supplied second power source.

  In the description of this embodiment, it is assumed that the main power supply is (i) completely turned on (ii) completely turned off (iii). Here, the instantaneous interruption of the main power supply means that the main power supply is turned off instantaneously. That is, the momentary interruption of the main power supply is made when the switch means 2 is turned on and turned off to on in a short time (for example, 0.1 seconds) (hereinafter referred to as “instantaneous interruption of the switch means 2”). It is a phenomenon that occurs.

  FIG. 2 shows an operation for supplying the first power source and the second power source to the first control unit 20 when the main power source is turned on and off. The vertical axis in FIG. 2 represents the voltage value being supplied, and the horizontal axis represents time. As shown in FIG. 2, when the main power supply is turned on, the first power supply system supplies the first power supply having the first operation supply value, and the second power supply system supplies the second operation supply. A second power supply of value is supplied.

  When the main power supply is completely turned off, both the first power supply voltage and the second power supply voltage drop. In FIG. 2, the timing at which the voltage of the first power source starts to drop is shown as a first drop timing, and the timing at which the voltage of the second power source starts to drop is shown as a second drop timing.

  As shown in FIG. 2, when the main power supply is turned off, the voltage of the first power supply to the first control unit 20 drops, and the voltage of the second power supply drops after the delay time elapses. That is, 2nd descent timing = 1st descent timing + delay time. This delay time can be determined by the setting of the delay means 6.

  As described above, since the second power supply passes through the delay means 6, a time difference (= delay time) occurs between the first drop timing and the second drop timing. In other words, the power generation means 50 includes the conversion branch means 4 that generates a plurality of power supplies from the main power supply, and the voltage drop of each power supply (here, the first power supply and the second power supply) when the main power supply is turned off. Delay means 6 for varying timing is included. The first control unit 20 is operated by a second power source whose lowering timing is slower than the first power source when the main power source is turned off.

Next, FIG. 3 shows changes in voltage values of the first power supply and the second power supply when the main power supply is momentarily interrupted. When main power is an instantaneous interruption in the first drop timing E ₁ the voltage of the first power source drops immediately re supply timing E ₂ returns to the first operation supply value (first power supply is re-supplied) . On the other hand, the voltage of the second power source does not drop (the voltage value of the second power source continues to be the second operation supply value).

FIG. 4 shows a processing flow of the image forming apparatus 150 according to the first embodiment. The main processing of the image forming apparatus 150 will be described with reference to FIG. First, the detection means 24 detects whether or not the voltage of the first power supply has dropped (step S2). When the detection unit 24 detects a voltage drop (first drop timing E ₁ ) of the first power supply (Yes in step S2), the measurement unit 34 detects a voltage drop of the first power supply (FIG. 2). From the first descent timing shown in FIG. 3, time measurement is started.

  And if the measurement means 34 measures that 1st predetermined time passed (Yes of step S4), the fall means 30 will perform a fall process (step S6). Here, the first predetermined time is a predetermined time and is shorter than the delay time (see FIG. 2). The shutdown process is a process performed in the image forming apparatus 150 in preparation for when the main power supply is completely turned off. The shutdown process is, for example, a process for saving data to be stored in the storage unit 36 or a process for stopping the control of the entire components in the image forming apparatus 150 by the first control unit 20. The data to be stored is, for example, data for image formation or data for FAX transmission.

  In this way, by performing the processing of step S4 and step S6, the shutdown process is always performed even when the main power supply is completely turned off or when the main power supply is momentarily cut off. There is an effect that can be done. Further, the processing in step S4 and step S6 may not be performed.

  Next, the detection means 24 detects whether or not the voltage of the second power supply has been lowered (step S8). As shown in FIG. 2, if the detection means 24 detects that the voltage of the first power supply has dropped and the voltage of the second power supply has dropped after the delay time has elapsed (Yes in step S8), the first CPU 22 It is determined that the main power supply is completely turned off (step S10).

  On the other hand, as shown in FIG. 3, when the detection unit 24 determines that the voltage of the second power supply does not drop (No in step S8), the process proceeds to step S12. The case of No in step S8 means that the second power source continues to be supplied despite the voltage drop of the first power source. In this case, the main power supply is momentarily cut off, or the voltage of the first power supply has dropped due to an abnormality in the power generation means 50.

In step S12, the detection unit 24 detects whether or not the first power is supplied again (the first power is supplied again) while the second power is being supplied. In other words, in step S12, the detection unit 24 monitors whether or not the first power is supplied. When the detection means 24 detects that the first power supply has been supplied again (resupply timing E ₂ ) (Yes in step S12), the detection means 24 determines that the main power supply has been momentarily cut off (step S16). Here, the case of “Yes” in step S12 is a case where the supply of the first power supply is interrupted for a short time (instantly) as shown in FIG. Therefore, when it is determined Yes in step S12, the detection unit 24 determines that the main power source is momentarily interrupted.

  The fact that the main power supply is interrupted means that the supply of the first power supply is instantaneously interrupted, so that the processing of the other device 60 is stopped, and as a result, the entire image forming apparatus 150 is stopped. There is a case. Therefore, the first startup unit 26 performs startup processing of the image forming apparatus 150 (step S18). Here, the start-up process is a process necessary for properly operating the image forming apparatus by cutting off the supply of the first power. The start-up processing is, for example, resetting of initial values of various parameters, abnormality inspection of the image forming apparatus 150, and the like. As described above, it is possible to prevent the operation of the image forming apparatus 150 from being stopped by the first startup unit 26 performing the startup process.

  Further, if it is determined that the main power source has been momentarily interrupted, the first re-execution means 28 may again execute the processing performed before the main power source has been instantaneously interrupted (step S18). . Thereby, even when the main power supply is momentarily interrupted, it is possible to perform the process that was performed before the main power supply was interrupted again and to resume the interrupted process. In addition, it is possible to prevent the occurrence of the phenomenon of waiting until all power supplies are cut off as in the prior art.

  In step S18, both the startup process by the first startup unit 26 and the re-execution process by the first re-execution unit 28 may be performed, or one of them may be performed.

  In addition, the user may be presented and selected as to whether or not to re-execute processing that was performed before the main power supply was interrupted.

  On the other hand, when the detection unit 24 determines that the first power supply is not supplied again (No in step S12), the measurement unit 34 starts measuring time from the time of the process in step S12. And the detection means 24 judges whether the 2nd predetermined time passed since the time of the process of step S12 (step S14). If the first power is not supplied again even after the second predetermined time has elapsed (Yes in step S14), the detection unit 24 determines that the power generation unit 50 is abnormal due to a failure (step S20). ).

  The detection means 24 determines No in step S12, and the fact that the first power source has not been resupplied even after the second predetermined time T2 has elapsed means that the second power source has been supplied (step S12). No in S8), that is, the supply of the first power is cut off (No in Step S12). In such a case, since there is no instantaneous interruption of the main power supply, it is determined that an abnormality has occurred in the power generation means 50 (step S20).

  By performing the processing of step S14 and step S20, the cause of the voltage drop of the first power supply is not the main power supply off (the main power supply is completely off or the main power supply is momentarily interrupted), but an abnormality in the power generation means 50 There is an effect that it can be determined that (failure). Steps S14 and S20 need not be performed.

According to the first embodiment, when the main power source is turned off among the plurality of power sources, the first control unit is supplied with the second power source having the lowering timing than the first power source having the earliest lowering timing. In the image forming apparatus having the above, it can be appropriately determined that the main power supply has been momentarily interrupted. Specifically, the detection of the drop of the first power supply voltage (Yes in step S2, the detection of the first falling timing E ₁₎ → detection of the voltage of the second power is not lowered (No in step S8) → resupply detection (Yes of step S12, the detection of the re-supply timing E ₂₎ of the first power supply, by detecting means 24 detects, as a main power supply is interruption, can be determined.

  In addition, in step S18, the first start-up unit 26 performs the start-up process, and thus it is possible to prevent the operation of the image forming apparatus 150 from being stopped.

  In step S18, the first re-execution means 28 re-executes the effect of resuming the processing interrupted due to the momentary interruption of the main power supply.

  In addition, by performing the processes in steps S4 and S6, it is possible to perform the shutdown process without fail even when the main power supply is completely turned off or when the main power supply is momentarily interrupted. There is an effect.

Further, by performing the processing of step S14 and step S20, the cause of the voltage drop of the first power supply is not the main power supply off (the main power supply is completely off or the main power supply is momentarily interrupted), but the power generation means 50 There is an effect that it can be determined that there is an abnormality (failure).
[Embodiment 2]
Next, an image forming apparatus according to the second embodiment will be described. FIG. 5 shows a functional configuration example of the image forming apparatus 250 according to the second embodiment. Compared with FIG. 1, FIG. 5 is different in that another device 60 is replaced by the second control unit 40. If the first control unit 20 is the main control unit 20, the second control unit 40 is a sub-control unit 40. That is, the first control unit 20 performs main control of the image forming apparatus, and the second control unit 40 performs sub control that is control other than the main control of the image forming apparatus 250.

  The second control unit 40 includes a second CPU 42 and an information generation unit 44. When the first power is supplied to the second CPU 42, the second control unit 40 performs sub-control on the image forming apparatus 250. In addition, the information generation unit 44 generates state information indicating normality or abnormality of itself (second control unit 40) and transmits the state information to the detection unit 24. The detection unit 24 can detect the state of the second control unit 40 by receiving the state information and analyzing the state information. In addition, other information is transmitted and received between the first control unit 20 and the second control unit 40. The image forming apparatus 250 operates appropriately by transmitting / receiving the other information. The other information is, for example, a control result by the control of the first control unit 20 or a control result by the control of the second control unit 40.

  The case where the information generating unit 44 generates and transmits state information indicating abnormality is because (i) the supply of the first power source to the second control unit 40 is interrupted (due to an instantaneous interruption of the main power source) And (ii) an abnormality caused by a failure of the second control unit 40. Further, the information generation unit 44 may generate state information indicating an abnormality and transmit it to the detection unit 24 only when the second control unit 40 is abnormal. In this case, the detection unit 24 detects that the second control unit 40 is normal during a period in which the state information indicating abnormality is not received.

  FIG. 6 shows a main processing flow of the image forming apparatus 250 of the second embodiment. Also, the same processing as the processing in FIG. 4 is given the same step number, and the description of the same processing is omitted. First, when it is determined No in step S2, the process proceeds to step S102. The case where it is determined No in step S <b> 2 is a case where the detection unit 24 detects that the first power source is supplied to the second control unit 40. And the detection means 24 receives the status information from the information generation means 44, analyzes it, and detects whether the 2nd control part 40 transmitted the status information which shows abnormality (step S102). If the analysis result of the state information by the detection unit 24 indicates that the second control unit 40 is abnormal, the detection unit 24 determines that the second control unit 40 is abnormal due to a failure (step S104). . In this case, the second control unit 40 warns the user that there is an abnormality due to a failure. As for the warning, the second control unit 40 displays on the display means (not shown) that the abnormality has occurred due to the failure, and allows the user to recognize by voice.

  If it is determined No in step S102, the process returns to step S2.

  If it is determined No in step S8, the process proceeds to step S106. Since it is determined in step S2 that the voltage of the first power supply has dropped, in step S106, the second control unit 40 detects state information indicating an abnormality indicating that the supply of the first power supply is interrupted. 24.

  And when it determines with Yes by step S12, ie, the detection means 24 detects that the 1st power supply was supplied again, it transfers to step S108. The process of step S108 is the same as the process of step S102. In step S108, the detection unit 24 determines whether or not the second control unit 40 has transmitted state information indicating abnormality. If the analysis result of the state information by the detection unit 24 indicates an abnormality of the second control unit 40 (Yes in step S108), the process proceeds to step S104. In step S104, the detection unit 24 determines that the second control unit 40 is abnormal due to a failure.

  If it is determined No in step S108, that is, if the second control unit 40 has not transmitted state information indicating an abnormality, the detection unit 24 detects that the main power supply has been momentarily cut off (step S108). S16).

  Here, the fact that the detection means 24 has detected that the main power supply has been momentarily interrupted means that only the second control unit 40 stops the processing or the second control unit 40 is reset. When the processing of the second control unit 40 is stopped or the second control unit 40 is reset, transmission / reception of information between the first control unit 20 and the second control unit 40 is stopped, and the image forming apparatus 250 The operation stops.

  Therefore, the second startup unit 32 performs startup processing of the second control unit 40 (step S110). Here, the start-up process of the second control unit 40 is necessary for properly operating the second control unit 40 that has been stopped or reset due to a drop in the voltage of the first power supply. It is a serious process. Specifically, the initial value of the second control unit 40 is reset, the abnormality of the second control unit 40 is checked, and the like. As described above, the first start-up means 26 performs the start-up process, so that the process of the second control unit 40 is stopped due to a momentary interruption of the main power supply, or the second control unit 40 is reset. There is an effect that can be prevented.

  If it is determined that the main power source has been momentarily interrupted (step S16), the second re-execution means 38 may again execute the processing performed before the main power source was momentarily interrupted. (Step S110). Thereby, even if the main power supply is momentarily cut off, the second control unit 40 can perform the process performed before the main power supply is cut off again, and can resume the interrupted process.

  In step S110, both the startup process of the second control unit 40 by the second startup unit 32 and the re-execution process of the second control unit 40 by the second re-execution unit 38 may be performed. Either of them may be performed.

  In step S110, the startup process by the first startup unit 26 and / or the re-execution process by the first re-execution unit 28 described in the first embodiment may be performed.

  According to the image forming apparatus of the second embodiment, when the image forming apparatus 250 includes the first control unit 20 that performs main control and the second control unit 40 that performs sub-control, the second control unit 40 The status information indicating the status of the second control unit 40 is transmitted to the detection means 24. Therefore, the detection unit 24 can detect the state (normal or abnormal) of the second control unit 40. The detecting unit 24 can also detect the supply of the first power source to the second control unit 40 or the voltage drop of the first power source.

  Moreover, the voltage drop of the 1st power supply to the 2nd control part 40 (Yes of step S2) → Supply of the 2nd power supply to the 2nd control part 40 (No of step S8) → The 2nd control part 40 is abnormal. If the second control unit 40 transmits the state information indicating normality (No in step S108), the detection unit 24 will transmit the state information indicating (step S106) → the second supply of power again (Yes in step S12). It is determined that the main power supply was momentarily interrupted. Therefore, even if the image forming apparatus includes the first control unit 20 that performs main control and the second control unit 40 that performs sub control, it is possible to appropriately determine an instantaneous interruption of the main power supply.

  Further, by performing the process of step S110, it is possible to prevent the process of the second control unit 40 from being stopped or the second control unit 40 from being reset. Stop of operation can be prevented.

  Further, by performing the process of step S110, there is an effect that the process of the second control unit 40, which has been interrupted due to the momentary interruption of the main power supply, can be resumed.

  Further, by performing the process of step S102, if the detection unit 24 detects an abnormality of the second control unit 40 while detecting the supply of the first power supply, the second control unit 40 is abnormal. There is an effect that it can be detected.

DESCRIPTION OF SYMBOLS 1 Main power supply 2 Switch means 4 Conversion branch means 6 Delay means 20 1st control part 22 1st CPU
Reference Signs List 24 detection means 26 first start-up means 28 first re-execution means 30 start-up means 32 second start-up means 34 measurement means 36 storage means 38 second re-execution means 40 second control unit 50 power generation means 60 other devices 150, 250 Image forming apparatus

JP 2009-181179 A

Claims (9)

Power generation means for generating a plurality of power supplies from a main power supply, and for varying the voltage drop timing of each of the plurality of power supplies when the main power supply is turned off;
A first control unit that is supplied with a second power source that is later in the lowering timing than the first power source that has the earliest lowering timing when the main power source is turned off among the plurality of power sources;
A second control unit that performs a control other than the control performed by the first control unit , includes a transmission unit that is supplied with the first power supply and that can transmit state information indicating normality or abnormality of itself to the first control unit; An electronic device having a control unit,
The first controller is
The main control in the electronic device is performed,
When the main power supply is turned off, a drop in the voltage of the first power supply is detected, and re-supply of the first power supply is detected while the second power supply is being supplied. The power supply has detection means for determining that the power supply has been interrupted,
The detecting means detects the supply of the first power supply or the voltage drop of the first power supply, and detects normality or abnormality of the second control unit by receiving the state information. Electronic equipment.   The electronic device according to claim 1, further comprising a first start-up unit that executes a start-up process of the electronic device when the detection unit determines that the main power source is instantaneously disconnected.   3. The electronic device according to claim 1, further comprising: a re-execution unit that re-executes the process before the instantaneous interruption when the detection unit determines that the main power source is instantaneously interrupted. 4.   The detection means includes a shutdown means for executing a shutdown process for performing a shutdown process of the electronic device after a first predetermined time has elapsed since the voltage drop of the first power supply was detected. The electronic device of any one of Claims 1-3.   The detection means detects a drop in the voltage of the first power supply when the main power supply is turned off, and after the second predetermined time has passed since the detection of the supply of the second power supply, 5. The electronic device according to claim 1, wherein when it is detected that the first power is not supplied, the power generation unit is determined to be abnormal. The detection means detects a drop in the voltage of the first power source, detects the supply of the first power source to the second control unit, and detects an abnormality in the second control unit,
2. The electronic device according to claim 1, wherein when the re-supply of the first power source to the second control unit is detected and normality of the second control unit is detected, it is determined that the main power source is momentarily interrupted. machine.   The electronic device according to claim 6, further comprising: a second startup unit that executes a startup process of the second control unit when the detection unit determines that the main power source is momentarily interrupted. .   The detection unit determines that the second control unit is abnormal when detecting the abnormality of the second control unit while detecting the supply of the first power supply. The electronic device as described in the paragraph. Power generation means for generating a plurality of power supplies from a main power supply, and for varying the voltage drop timing of each of the plurality of power supplies when the main power supply is turned off;
A first control unit that is supplied with a second power source that is later in the lowering timing than the first power source that has the earliest lowering timing when the main power source is turned off among the plurality of power sources;
A second control unit that performs a control other than the control performed by the first control unit , includes a transmission unit that is supplied with the first power supply and that can transmit state information indicating normality or abnormality of itself to the first control unit; A control method for controlling an electronic device having a control unit,
The first controller is
The main control in the electronic device is performed,
When the main power supply is turned off, a drop in the voltage of the first power supply is detected, and re-supply of the first power supply is detected while the second power supply is being supplied. The power supply performs a detection process to determine that it has been momentarily interrupted,
The detecting step detects the normality or abnormality of the second control unit by detecting the supply of the first power supply or the voltage drop of the first power supply and receiving the state information. Control method.

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