Electronic device

Abstract

To surely prevent a power failure recovery operation not intended by a user.SOLUTION: An image forming apparatus controls a power failure recovery operation by using a power source ON flag that is turned on (1) when a power switch 104 is depressed and turned off (0) when the apparatus is normally shut down. When the power switch 104 is depressed in a shut-down state (S701), and when writing a "power source ON flag=1" in an EEPROM 103, the image forming apparatus controls to write the flag after the lapse of a predetermined time or more (S704-S705).SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to electronic equipment such as an image forming apparatus having a facsimile function or the like. [Background technology]

[0002] Some conventional electronic devices, such as multifunction peripherals (image forming devices) with a facsimile function, have a function of automatically returning to the state before the power outage or to a standby state when the power outage is resolved after an abnormal shutdown due to a sudden power outage or the like.

[0003] Patent Document 1 discloses a technique for storing in a non-volatile memory the operating state immediately before the previous interruption of the commercial power supply, and for switching whether or not to automatically return the multifunction device to normal operation when the commercial power supply is next resumed by reading the data in the non-volatile memory. In other words, the technique discloses a technique for restarting the multifunction device without the user having to press the power switch if it is recognized from the data stored in the non-volatile memory that the multifunction device was not normally shut down before the previous power supply interruption.

[0004] Furthermore, Patent Document 2 discloses a technique for preventing a multifunction device from restarting when the power plug of the multifunction device is first inserted into a power outlet after it is shipped and delivered, for example, if the manufacturing process has not ended normally. The use of non-volatile memory is similar to Patent Document 1, but Patent Document 2 also includes a means for recognizing whether a predetermined time or more has passed since the power was turned off. Patent Document 2 prevents the multifunction device from restarting if a predetermined time or more has passed, even if the device has not ended normally. This is on the assumption that a considerable amount of time has passed from the manufacturing process to delivery to the user after shipping. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2011-160526 A [Patent Document 2] JP 2016-76033 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the conventional configuration has a problem in that it is not possible to reliably prevent unintended power failure recovery operations (the above-mentioned automatic recovery operations) as described below. This problem will be explained with reference to FIG. 10.

[0007] FIG. 10 is a block diagram illustrating a part of the electrical configuration within a conventional image forming apparatus. The commercial power source 20 supplies power via a power outlet (not shown). When a power plug is inserted into the power outlet and connected to the commercial power source 20 via a power cable, the power supply board 21 generates a DC voltage to be used in the image forming apparatus. A large-capacity smoothing electrolytic capacitor 22 is connected to the power supply board 21.

[0008] The DC controller board 23 performs various controls of the image forming apparatus. The DC controller board 23 has a CPU 24 and a non-volatile memory 25. The non-volatile memory 25 is connected to the CPU 24 so as to be accessible. In addition, a power switch (SW) 26 is connected to the DC controller board 23. The power switch 26 is connected so that the CPU 24 can detect when the power switch 26 is operated.

[0009] When commercial power is supplied, a DC voltage (3.3 V) is output from the power supply board 21 and supplied to the controller board 23. When the CPU 24 detects that the power switch 26 has been pressed, it starts up each component of the image forming apparatus and stores in the non-volatile memory 25 a “power ON flag” indicating that the power has been turned ON, and puts the image forming apparatus into a standby state.

[0010] Next, when it is detected that the power switch 26 has been pressed while in standby mode, the CPU 24 performs a prescribed shutdown process, records in the non-volatile memory 25 that the process has ended normally (clears the aforementioned "power ON flag"), and then turns off the image forming apparatus.

[0011] Even if the power plug is removed from the power outlet after the image forming apparatus is turned off and the supply of commercial power is stopped, a charge remains in the electrolytic capacitor 22 in the power supply board 21 for a while. Therefore, while a charge remains in the electrolytic capacitor 22, a DC voltage (3.3V) continues to be output from the power supply board 21 and supplied to the controller board 23. In this case, the power consumption of the image forming apparatus is very small, so the discharge of the smoothing electrolytic capacitor 22 does not progress easily, and this state continues for about several minutes (5 to 10 minutes).

[0012] In this state, if the user accidentally presses the power switch 26, the CPU 24 starts the startup process of the image forming apparatus and records a "power ON flag" in the non-volatile memory 25. However, because the startup process increases power consumption, the electrolytic capacitor 22 discharges in a short time (about several hundred msec), cutting off the supply of DC voltage and forcing the apparatus to shut down. In this case, the CPU 24 cannot clear the "power ON flag" stored in the non-volatile memory 25, so the "power ON flag" remains recorded.

[0013] Thereafter, when the power plug is reconnected to the power outlet and commercial power supply is resumed, DC voltage (3.3V) is supplied from the power supply board 21 to the DC controller board 23, and the CPU 24 starts up. When the started CPU 24 accesses the non-volatile memory 25 and recognizes that the "power ON flag" remains, it determines that the previous operation was abnormally terminated due to a power outage or the like, and unintentionally restarts the image forming apparatus. From the user's point of view, this is an unintended behavior and is not desirable. Note that various electronic devices (including home appliances) also have the above-mentioned power failure recovery function, and this problem is common to such electronic devices as well. Thus, conventional electronic devices have a problem in that they cannot reliably prevent unintended power failure recovery operations.

[0014] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a mechanism for reliably preventing a power failure recovery operation unintentional by a user. [Means for solving the problem]

[0015] The present invention provides an electronic device, comprising: a control unit including a control unit for controlling the electronic device and a non-volatile storage unit; and a control unit for storing a power supply voltage and a power supply voltage when a first power is inputted to the electronic device; Through a capacitor Generate a second power and supply the second power to the control unit. Even if the input of the first power is lost, the second power can be supplied by the charge of the capacitor. a power supply means and a switch for a user to instruct the start-up of the electronic device, wherein the control means, when the supply of the second power from the power supply means to the control unit is resumed without the operation of the switch, starts the start-up of the electronic device if predetermined information related to the supply of power is stored in the storage means, and does not start the electronic device if the predetermined information is not stored in the storage means; The electronic device is brought out of a shutdown state. storing the predetermined information in the storage means after a predetermined time has elapsed when the start-up is instructed by operating the switch; With the predetermined information stored When the electronic device is normally shut down by operating the switch, the predetermined information is erased from the storage means. It is , The predetermined information is information indicating that the switch has been operated to turn on the power supply of the electronic device, and the predetermined time is equal to or longer than the time corresponding to the time from when the switch is operated in a state in which the first power is not being input to when the second power is no longer supplied to the control means. It is characterized by: Effect of the Invention

[0016] According to the present invention, it is possible to reliably prevent a power failure recovery operation unintentional by a user. [Brief description of the drawings]

[0017] [Figure 1]1 is a block diagram illustrating a part of an electrical configuration of an image forming apparatus as an example of an electronic device according to a first embodiment. [Diagram 2] 5 is a timing chart showing an example of a transition of a power state after the power plug of the image forming apparatus is inserted into a power outlet. [Diagram 3] 6 is a timing chart showing an example of a power state transition when the power plug is unplugged from the power outlet while the image forming apparatus is shut down. [Figure 4] 6 is a timing chart showing an example of power state transition when the power switch is pressed immediately after the power plug is removed from the power outlet while the image forming apparatus is turned off. [Diagram 5] 5 is a flowchart illustrating an operation when a power plug is inserted into a power outlet. [Figure 6] 5 is a flowchart illustrating an operation performed when a power switch is pressed while the image forming apparatus is in a standby state. [Figure 7] 5 is a flowchart illustrating an operation performed when the power switch is pressed while the image forming apparatus according to the first embodiment is in a shutdown state. [Figure 8] FIG. 11 is a block diagram illustrating a part of the electrical configuration of an image forming apparatus as an example of an electronic device according to a second embodiment. [Figure 9] 10 is a flowchart illustrating an operation performed when a power switch is pressed while an image forming apparatus according to a second embodiment is in a shutdown state. [Figure 10] FIG. 1 is a block diagram illustrating a part of an electrical configuration of an image forming apparatus as an example of a conventional electronic device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. However, the components described in the embodiment are merely examples, and the scope of the present invention is not limited to these.

[0019] [First embodiment] FIG. 1 is a block diagram showing a part of the electrical configuration of an image forming apparatus as an example of an electronic device according to a first embodiment of the present invention.

[0020] The commercial power source 120 supplies commercial power (AC 100V) via a power outlet (not shown). When a power plug is inserted into the power outlet and the power source board (power unit) 121 is connected to the commercial power source 120 via a power cable, the power source board (power unit) 121 generates a DC voltage to be used in the image forming apparatus. The commercial power supplied to the power source board 121 is input to a first AC / DC converter circuit 130. After being input to the first AC / DC converter circuit 130, the supplied commercial power is rectified by a rectifier circuit 125 and smoothed by a smoothing electrolytic capacitor 126. A DC voltage (3.3V) is generated via a switching FET 127, an insulating transformer 128, and a rectifier / smoothing circuit 129. This DC voltage is stably controlled to 3.3V by switching the switching FET 127 at a frequency and duty ratio fed back by a comparison circuit 131 and a control IC 132. This DC voltage (3.3 V) is configured to be constantly output from the first AC / DC converter circuit 130 while the commercial power source 120 is being supplied.

[0021] The second AC / DC converter 123 is a circuit that generates a DC voltage (24V) that provides a relatively large amount of power for driving a drive motor in the image forming apparatus and a high-voltage power supply used for image formation. The internal circuit configuration of the second AC / DC converter 123 is similar to that of the first AC / DC converter circuit 130. The supply of commercial power to the second AC / DC converter 123 is controlled by a relay 124. When the image forming apparatus main body is in a power saving mode or in a shutdown state, the relay 124 has a function of cutting off the supply of commercial power to the second AC / DC converter 123 in order to prevent unnecessary power consumption.

[0022] The DC controller board 101 is a control unit that controls each operation in the image forming apparatus. The DC controller board 101 is responsible for controlling each load operation in the image forming apparatus. A non-volatile memory (EEPROM) 103 is connected to the CPU 102, and any data can be read and written to the memory. The CPU 102 reads and executes programs stored in the non-volatile memory 103 or other ROMs (not shown) to perform various controls.

[0023] Power switch 104 is attached to the exterior of the image forming apparatus so that it can be operated by the user, and is electrically connected to CPU 102 so that its operation can be detected. Note that by operating power switch 104 in a state in which the image forming apparatus is shut down, the user can instruct the image forming apparatus to start up. Also, by operating power switch 104 when the image forming apparatus is in an activated state (standby state, etc.), the user can instruct the image forming apparatus to shut down.

[0024] A motor driver IC (M-Drv) 105 has a function of driving a motor 106 for operating the image forming apparatus, and is capable of driving the motor 106 under the control of the CPU 102 while 24V is being supplied. The high-voltage board 107 has a function of generating a high-voltage power supply voltage necessary for image formation operations, and is capable of operating under the control of the CPU 102 with 24 V supplied. The operation unit 108 has operation keys and a liquid crystal display unit for a user to operate the image forming apparatus. The operation unit 108 can operate under the control of the CPU 102 with 24V supplied.

[0025] Sensor 109 is a sensor for detecting the position of paper in the image forming apparatus. In an actual image forming apparatus, a plurality of motors, sensors, and other boards are connected to DC controller board 101. However, in order to simplify the explanation, only some of the loads connected to DC controller board 101 are shown in FIG.

[0026] FIG. 2 is a timing chart showing an example of the transition of the power state after the power plug of the image forming apparatus is inserted into the power outlet. When the power plug is inserted into the power outlet at timing T1, power is supplied from commercial power source 120 via the power cable to power supply board 121, a voltage of 3.3 V is generated in power supply board 121 and supplied to DC controller board 101. When 3.3 V is supplied to CPU 102 in DC controller board 101, CPU 102 starts up.

[0027] When the CPU 102 detects that the power switch 104 has been pressed (i.e., detects a startup instruction) at timing T2, a 24V_ON signal is output at timing T3, the relay 124 is turned ON, and a 24V voltage is generated at timing T4. 24V is supplied to each board and load, and the entire image forming apparatus is started up.

[0028] Next, when power switch 104 is pressed at timing T5, the image forming apparatus performs a shutdown process for each board and load, and at timing T6 inverts the 24V_ON signal to turn off relay 124, thereby stopping the 24V output and shutting down the apparatus. At this point, 3.3V continues to be output normally, and CPU 102 continues to operate.

[0029] FIG. 3 is a timing chart showing an example of power state transition when the power plug is unplugged from the power outlet while the image forming apparatus is shut down. When the power plug is removed from the power outlet at timing T7, the power supply from commercial power supply 120 stops, but because smoothing electrolytic capacitor 126 has a large capacity, the 3.3V voltage continues to be output for several minutes (for example, 5 to 10 minutes). That is, in power supply board 121, the 3.3V voltage is generated using the charge stored in electrolytic capacitor 126 as the power source. When electrolytic capacitor 126 has discharged to a certain extent (timing T8), the output of 3.3V stops, and CPU 102 also enters a stopped state.

[0030] FIG. 4 is a timing chart showing an example of power state transition when the power switch is pressed immediately after the power plug is removed from the power outlet while the image forming apparatus is shut down (powered off). When the power plug is pulled out at timing T7 and the power switch 104 is pressed immediately thereafter (at timing T9), the 24V_ON signal turns ON at timing T10 because the CPU 102 is still in operation. This causes 24V to be output at timing T11, and the start-up operation of the image forming apparatus begins.

[0031] However, since this startup operation increases power consumption, the electrolytic capacitor 126 is quickly discharged, and the output of both 3.3V and 24V stops in a short time (for example, about 100 to 200 msec) (timing T12), and the image forming apparatus body is forcibly shut down. 4 indicates the time from when the power switch 104 is pressed to when the device enters a shutdown state with the power plug unplugged, and is, for example, about 100 to 200 msec. In other words, the predetermined time Td can be said to correspond to the time from when the power switch 104 is pressed to when the supply of DC voltage (3.3 V, 24 V) is cut off with the commercial power input cut off.

[0032] 5 is a flowchart for explaining the operation when the power plug is inserted into the power outlet. The processing of this flowchart is realized by the CPU 102 reading and executing a program stored in the non-volatile memory 103 or other ROM (not shown).

[0033] When the power plug is inserted into the power outlet, the supply of 3.3V voltage to the CPU 102 is started (restarted), and the CPU 102 starts up (S501). In S502, the CPU 102 checks the power ON flag at a predetermined address in the non-volatile memory 103 and determines whether it is set to "1." The power ON flag is stored at a predetermined address in the non-volatile memory 103 as predetermined information indicating that the power has been turned ON ("1" is stored), and is cleared (erased) when the operation ends normally ("0" is stored).

[0034] If the power-on flag is set to "1" (Yes in S502), the CPU 102 advances the process to S503. In S503, the CPU 102 starts the startup process of the image forming apparatus. Next, in S504, the CPU 102 waits for the start-up process to finish. When the start-up process finishes (Yes in S504), the CPU 102 advances the process to S505 and transitions to a standby state.

[0035] On the other hand, if the power ON flag is not set to "1" (No in S502), the CPU 102 advances the process to S506 without starting up the image forming apparatus, and transitions to a shutdown state.

[0036] 6 is a flowchart for explaining the operation (power failure recovery operation) when the power switch 104 is pressed while the image forming apparatus is in a standby state. The processing of this flowchart is realized by the CPU 102 reading and executing a program stored in the non-volatile memory 103 or other ROM (not shown) or the like.

[0037] When the power switch 104 is pressed during standby (S601), the CPU 102 detects this and advances the process to S602. In S602, the CPU 102 executes a shutdown process, and when the shutdown process ends (Yes in S602), the process proceeds to S603.

[0038] In S603, the CPU 102 turns off the 24V_ON signal. Next, in S604, the CPU 102 updates the power-on flag written in a predetermined address of the non-volatile memory 103 to "0," and in S605, transitions to a shutdown state.

[0039] 7 is a flowchart for explaining the operation when the power switch is pressed while the image forming apparatus according to the first embodiment is in a shutdown state. The processing of this flowchart is realized by the CPU 102 reading and executing a program stored in the non-volatile memory 103 or other ROM (not shown) or the like.

[0040] When the power switch 104 is pressed in the shutdown state (S701), the CPU 102 detects this and advances the process to S702. In S702, the CPU 102 turns on the 24V_ON signal, causing the power supply to output a voltage of 24V.

[0041] Next, in step S703, the CPU 102 starts the startup process of the image forming apparatus. Next, in S704, CPU 102 controls the process to proceed to S705 after a predetermined time Td has elapsed. As shown in Fig. 4, the predetermined time Td corresponds to the time from when the image forming apparatus is started by operating switch 104 with the commercial power input cut off until the supply of DC voltage (3.3V) to CPU 102 is cut off. Therefore, if power switch 104 is pressed with the power plug unplugged, the power supply to CPU 102 is cut off while it is being determined in S704 whether the predetermined time Td has elapsed, and the process from S705 onwards is not executed.

[0042] After a predetermined time Td has elapsed (Yes in S704), in S705, the CPU 102 writes a power ON flag of 1 to a predetermined address in the non-volatile memory (103). Note that the waiting time in S704 is not limited to Td, and may be any time equal to or greater than Td.

[0043] Next, in S706, the CPU 102 waits for the start-up process of the image forming apparatus to finish, and after the start-up process has finished (YES in S706), the CPU 102 transitions to a standby state in S707.

[0044] In this embodiment, the process of S705 (setting the "power ON flag") is executed after a predetermined time or more has elapsed in S704 in FIG. 7. As a result, even if the power switch 104 is pressed by mistake while the power plug is unplugged (commercial power input is cut off), the supply of 3.3V voltage is stopped and the device is shut down before writing "1" to the power ON flag in S705. Therefore, the next time the power plug is plugged in, the power ON flag is set to "0" in S502 in FIG. 5, so that the image forming device can be prevented from starting up unintentionally. Note that in this embodiment, it is not necessary to add a circuit for rapidly discharging the smoothing electrolytic capacitor 126, and the problem of preventing the image forming device from starting up unintentionally can be solved without increasing the size and cost of the board.

[0045] Second Embodiment Fig. 8 is a block diagram showing a part of the electrical configuration of an image forming apparatus according to a second embodiment of the present invention. The difference between Fig. 8 showing the second embodiment and Fig. 1 showing the first embodiment is the presence or absence of a zero-cross detection circuit 801, and the same reference numerals are used for the same components as in Fig. 1.

[0046] The zero-cross detection circuit (ZC) 801 is a circuit that generates a ZEROX signal whose output is inverted when the AC voltage supplied from the commercial power supply 120 becomes 0V. For example, when the supplied commercial power is 100V / 50Hz, a 50Hz square wave is output as the ZEROX signal. Also, when the power plug is unplugged from the power outlet, the ZEROX signal is not generated. The ZEROX signal is connected so that it can be detected by the CPU 102.

[0047] 9 is a flowchart for explaining the operation when the power switch is pressed while the image forming apparatus according to the second embodiment is in a shutdown state. The processing of this flowchart is realized by the CPU 102 reading and executing a program stored in the non-volatile memory 103 or other ROM (not shown) or the like. The same steps as those in FIG. 7 are given the same step numbers, and their explanations will be omitted.

[0048] In the second embodiment, after starting the startup process of the image forming apparatus in S703, the CPU 102 advances the process to S901. In S901, the CPU 102 detects whether or not the ZEROX signal is input. If the ZEROX signal is input (Yes in S901), the CPU 102 determines that commercial power is being input, advances the process to S705, and writes the power ON flag=1.

[0049] On the other hand, if the ZEROX signal is not detected (No in S901), the CPU 102 determines that the commercial power input is cut off, and proceeds to S902 without writing the power ON flag=1. In S902, the CPU 102 controls the process to proceed to S903 after a predetermined time Td (the same time as Td in the first embodiment) has elapsed. After the predetermined time Td has elapsed (Yes in S902), the CPU 102 displays (notifies) an error indicating that the ZEROX signal is abnormal in S903.

[0050] As described above, by waiting for the predetermined time Td in S902, if the power plug is unplugged, the supply of 3.3V and 24V voltages is stopped and the image forming apparatus main body is shut down before an error is detected, thereby preventing erroneous error detection. Note that the waiting time in S902 is not limited to Td, and may be any time equal to or greater than Td. The operation flowchart when the power plug is connected to the power outlet and the supply of commercial power is started is the same as that shown in FIG. 5 in the first embodiment.

[0051] In the second embodiment, even if the power switch 104 is pressed by mistake while the power plug is unplugged, if the ZEROX signal is not detected in S901, the writing operation in S705 is not performed. Therefore, the next time the power plug is plugged in, the power ON flag is set to "0" in S502 of Fig. 5, and it is possible to prevent the image forming apparatus from starting up unintentionally.

[0052] In the above-described embodiments, an example has been described in which the power plug of the power cable of the image forming apparatus is inserted / removed from the power outlet of the commercial power source 120. In a configuration in which the power cable can be inserted / removed from the image forming apparatus main body, the same applies to the case in which the power cable is inserted / removed from the image forming apparatus main body while the power plug of the power cable of the image forming apparatus is inserted into the power outlet of the commercial power source 120.

[0053] In the first embodiment, a configuration was described in which the timing of setting the "power ON flag" in the non-volatile memory is delayed for a predetermined time or more after it is detected that the power switch 104 has been pressed. In the second embodiment, a configuration was described in which the "power ON flag" is set in the non-volatile memory when it is detected that the power switch 104 has been pressed and a ZEROX signal is detected, and is not set when the ZEROX signal is not detected. Note that the second embodiment is not limited to detection of the ZEROX signal, and any means may be used as long as it is capable of detecting the presence or absence of input from the commercial power source 120. Furthermore, the present invention is not limited to these configurations, and any method may be used as long as it is possible to realize control that does not write a “power ON flag” to non-volatile memory when power switch 104 is pressed while commercial power source 120 is not being input.

[0054] According to each of the above embodiments, when the power switch is pressed immediately after the power plug is unplugged from the outlet, it is possible to prevent the "power ON flag" from being stored in the non-volatile memory before the device is shut down again. Therefore, when the supply of commercial power is resumed next time, it is possible to prevent the device from performing the power failure recovery operation unless it is intended to do so. Furthermore, the present invention is not limited to image forming apparatuses, but can also be applied to various electronic devices including home appliances, and can prevent power failure recovery operations of devices unintended by the user.

[0055] It goes without saying that the configurations and contents of the various data described above are not limited to those described above, and the data may have various configurations and contents depending on the application and purpose. Although one embodiment has been described above, the present invention can be embodied, for example, as a system, an apparatus, a method, a program, a storage medium, etc. Specifically, the present invention may be applied to a system composed of multiple devices, or may be applied to an apparatus composed of a single device. Furthermore, any combination of the above-described embodiments is also included in the present invention.

[0056] (Other embodiments) The present invention can also be realized by a process in which a program for implementing one or more of the functions of the above-described embodiments is supplied to a system or device via a network or a storage medium, and one or more processors in a computer of the system or device read and execute the program. The present invention can also be realized by a circuit (e.g., ASIC) that implements one or more of the functions. Furthermore, the present invention may be applied to a system made up of a plurality of devices, or to an apparatus made up of a single device. The present invention is not limited to the above-mentioned embodiment, and various modifications (including organic combinations of the embodiments) are possible based on the spirit of the present invention, and are not excluded from the scope of the present invention. In other words, the present invention includes all configurations that combine the above-mentioned embodiments and their modifications. [Explanation of symbols]

[0057] 101 DC controller unit 102 CPU 103 Non-volatile memory 104 Power Switch 121 Power supply board 120 Commercial power supply 126 Smoothing electrolytic capacitor 130 First AC / DC converter circuit

Claims

1. An electronic device, A control unit including a control unit for controlling the electronic device and a non-volatile storage unit; a power supply means for generating a second power from a first power via a capacitor while the first power is being input, and supplying the second power to the control unit, the power supply means being capable of supplying the second power by the charge of the capacitor even when the input of the first power is no longer present; a switch for a user to instruct activation of the electronic device; the control means, when the supply of the second power from the power supply means to the control unit is resumed without the operation of the switch, controls so as to start the startup of the electronic device if predetermined information related to the supply of power is stored in the storage means, and does not start the electronic device if the predetermined information is not stored in the storage means; when the start-up of the electronic device is instructed by operating the switch from a shutdown state, the specified information is stored in the storage means after a predetermined time has elapsed, and when shutdown of the electronic device is normally completed by operating the switch while the specified information is stored, the specified information is erased from the storage means, the predetermined information is information indicating that the switch has been operated to turn on the power supply of the electronic device, The electronic device characterized in that the specified time is equal to or longer than the time corresponding to the time from when the switch is operated while the first power is not being input to when the second power is no longer supplied to the control means.

2. An electronic device, a control unit including a control unit for controlling the electronic device and a non-volatile storage unit; a power supply means for generating a second power from a first power via a capacitor while the first power is being input, and supplying the second power to the control unit, the power supply means being capable of supplying the second power by the charge of the capacitor even when the input of the first power is no longer present; a switch for a user to instruct activation of the electronic device; a detection means for detecting an input of the first power, the control means, when the supply of the second power from the power supply means to the control unit is resumed without the operation of the switch, controls so as to start the startup of the electronic device if predetermined information related to the supply of power is stored in the storage means, and does not start the electronic device if the predetermined information is not stored in the storage means; when the electronic device is in a shutdown state and the start-up is instructed by operating the switch, if the input of the first power is detected by the detection means, the predetermined information is stored in the storage means, and if the input of the first power is not detected by the detection means, the predetermined information is not stored in the storage means, when the shutdown of the electronic device is normally completed by operating the switch while the predetermined information is stored in the storage means, the predetermined information is erased from the storage means, The predetermined information is information indicating that the switch has been operated to turn on the power supply of the electronic device.

1. An electronic device comprising:

3. the control means notifies the detection means that an abnormality has occurred when the input of the first power is not detected by the detection means and a predetermined time has elapsed since the operation of the switch when the start-up is instructed by the operation of the switch, 3. The electronic device according to claim 2, wherein the predetermined time is equal to or longer than the time corresponding to the time from when the switch is operated while the first power is not being input to when the second power is no longer supplied to the control means.

4. The first power is power supplied from a commercial AC power source, the detection means includes a detection circuit that detects a zero crossing of an AC voltage from the commercial AC power supply, and outputs a predetermined signal in response to the detection of the zero crossing when the first power is being input, and does not output the predetermined signal when the first power is not being input, a state in which the input of the first power is detected by the detection means is a state in which the predetermined signal is output from the detection means, 4. The electronic device according to claim 2, wherein the state in which the input of the first power is not detected by the detection means is a state in which the predetermined signal is not output from the detection means.

5. An electronic device as described in claim 1 or 3, characterized in that when the first power is cut off, the control means, even if it detects that the switch has been operated, does not store the specified information in the memory means before the specified time has elapsed since the switch was operated, and becomes inoperable due to the discharge of the charge stored in the capacitor.

6. 6. The electronic device according to claim 1, wherein the electronic device is an image forming device.

Images