JP2007111915A - Electronic instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic instrument which is able to maintain a supplying of power from a power supply unit to a display system or a logic system while stopping the supplying of power to a power system at the time of an abnormality occurrence even for the electronic instrument equipped with the power supply unit to which two or more power circuits with different supplied powers are connected in series. <P>SOLUTION: A time is clocked by a counter 45, the output value of a comparator 47 becomes normal "0" during the time of the clocked time being a WDT setting of a register 46 or less. If the clocked time exceeds the WDT setting, the output value of the comparator 47 becomes abnormal "1". Whenever a RW signal for writing data in a B register 42 is input, the counter 45 is reset by a register 44. During the time of the output of the comparator 47 being normal "1", an enable signal is output from an OR circuit 48, If the output becomes abnormal "0", the enable signal is intercepted. A supplying of power to an electric motor is stopped by the interception of the enable signal. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electronic apparatus such as a printer, and more particularly to an electronic apparatus having a function of cutting off power supply to a power system when an abnormality of the power system such as an electric motor is detected.

  2. Description of the Related Art Conventionally, an ink jet printer that is one of these types of electronic devices is provided with a power system such as a motor and a recording head, an operation panel system having a display unit, and a control system such as a CPU. A power supply device that supplies different voltages is provided. For example, in the case of a printer, for example, the power system voltage is 42V, the operation panel system voltage is 5V, and the control system voltage is 3.3V. Three types of voltages are generated from the commercial AC power supply 100V.

  Conventionally, there are two types of power supply devices as methods for generating different voltages. One system is a system in which a plurality of power supply circuits are connected in series, and a primary power supply circuit that generates a voltage to be supplied to a power system from a commercial AC power supply 100V, and an output voltage of the primary power supply circuit is stepped down and supplied to a control system. A secondary power supply circuit that generates a voltage to be generated (for example, Patent Document 1). Another method is a method in which a plurality of power supply circuits are connected in parallel, and a power system voltage and a control system voltage are individually generated from a commercial AC power supply 100V using a power supply circuit prepared for each voltage. It is. In the former method, if the primary power supply circuit is cut off, the voltage supply for the entire system of the electronic equipment is cut off.On the other hand, the power supply circuit can be cut off for each voltage individually. Can be blocked. In recent years, in order to reduce the standby power of electronic devices, when a certain standby time has elapsed, the power supply voltage is cut off and the power saving mode is used to supply power only to a part including the control system such as CPU. In this type of electronic equipment, the latter method is particularly adopted, in which the voltage supply to each system can be individually cut off.

By the way, this type of electronic device has a function of shutting off the power supply when an abnormality is detected. For example, Patent Document 2 discloses an image forming apparatus that interrupts voltage supply when a major abnormality such as a fixing heater abnormality is detected in a printer. The image forming apparatus also monitors a communication abnormality between the printer controller and the engine controller. If the communication abnormality continues for a predetermined time, the printer controller displays on the operation panel, and the engine controller and its controlled object. The power supply to was to be cut off. This is because if the communication between the printer controller and the engine controller is cut off, the printer controller cannot know the abnormality through communication even if the engine controller detects a corner abnormality. At this time, since the power supply system is connected in parallel to the engine controller and its controlled object and the operation panel, the display on the operation panel does not disappear even if the power supply to the engine controller or the like is cut off. It was.
JP 2000-245153 A JP 2004-252192 A

  However, in the case of an electronic device that employs the former power supply device in which the power supply circuit is arranged in series, if the primary power supply circuit that supplies power to the power system is shut off, the secondary power supply circuit is also shut down. There is a problem that the panel cannot be displayed and the user cannot be notified of the occurrence of an abnormality.

  The present invention has been made to solve the above-described problems, and the object thereof is to generate an abnormality even in an electronic device including a power supply device in which a plurality of power supply circuits having different supply powers are connected in series. It is an object of the present invention to provide an electronic device capable of maintaining power supply from a power supply device to a display system or a logic system while sometimes stopping power supply to a power system.

The present invention is an electronic device that inputs power system power generated by a primary power supply circuit and a secondary power circuit generates control system power, and is driven by the power system power; and
A control unit that is operated by software, an output circuit that is controlled by the control unit and outputs an enable signal, a drive circuit that controls power supplied to the drive unit based on the enable signal output from the output circuit, The gist of the present invention is to provide a monitoring circuit that monitors the operation of the control unit and cuts off the enable signal when there is an error.

  According to this, the monitoring circuit monitors the operation of the control unit and cuts off the enable signal when there is an error. As a result, power supply to the driving means is stopped. For example, if an error occurs, shutting down the primary power supply circuit and shutting off the power supply to the drive means also shuts down the secondary power supply circuit and shuts down the control system. It becomes impossible to notify or leave a history of errors. On the other hand, according to the electronic apparatus of the present invention, since the power supply to the driving means is shut off without shutting down the primary power supply circuit, it is possible to leave an error display and history.

  In the electronic device of the present invention, the output circuit outputs an enable signal corresponding to the data value written from the control unit, and the monitoring circuit drives the data value output from the control unit. It is preferable to monitor the writing to the circuit and shut off the enable signal if there is an error.

  According to this, the monitoring circuit monitors the writing of the data value output from the control unit to the driving circuit, and cuts off the enable signal when there is an error. As a result, power supply to the driving means is stopped. For example, if an error occurs, shutting off the primary power supply circuit and shutting off the power supply to the drive means will also shut off the power generation of the secondary power supply circuit, and the control system will also be shut off, It becomes impossible to notify by display or to keep a history of errors. On the other hand, according to the electronic apparatus of the present invention, since the power supply to the driving means is shut off without shutting down the primary power supply circuit, it is possible to leave an error display and history.

  The electronic device of the present invention further includes a nonvolatile storage unit, and when an error is detected by the monitoring circuit, the control unit stores error information in the storage unit before the primary power supply circuit is shut off. It is preferable to do.

  According to this, when an error is detected in the monitoring circuit, the error information is stored in the storage unit before the primary power supply circuit is shut off. Therefore, error information can be left in the storage unit. In addition, the interruption of the primary power supply circuit includes not only the configuration performed by the control unit but also the one performed by a person operating the power switch. When the power switch is operated and shut off, the error may be stored in the storage unit immediately after the error is detected, or only after the power switch is operated until the shut-off process for shutting off the primary power circuit is completed. The error information may be stored using this time. Furthermore, it is possible to adopt a configuration in which the power-off time is delayed in order to secure the error information storage processing time after the power switch is operated.

  In the electronic device of the present invention, when an error is detected in the monitoring circuit, the control unit preferably stores the error information in the storage unit and then the control unit shuts off the primary power supply circuit.

  According to this, when an error is detected in the monitoring circuit, after the error information is stored in the storage unit, the primary power supply circuit is shut off by the control unit. For this reason, even if a person does not operate a power switch, a primary power supply circuit is cut off automatically and error information can be stored in a storage unit.

  The electronic device according to the present invention further includes a notifying unit for notifying an error, and the control unit shuts off the primary power supply circuit based on the error detected by the monitoring circuit, and then the electronic device. It is preferable to check whether or not the error information is stored in the storage unit when the error information is started, and if the error information is stored, notify the error information by the notification unit. Here, the notification unit includes a display unit such as a character information display unit and an image display unit, a sound notification unit, a sound notification unit such as a buzzer and a siren, and a lighting display unit such as an LED. A display unit that can be notified by information is particularly preferable.

  According to this, the primary power supply circuit is shut off when the control unit detects an error in the monitoring circuit. Next, when the electronic device is started up, the control unit checks whether or not the error information is stored in the storage unit, and if the error information is stored, the error unit notifies the error information. Therefore, when the power is turned on next time and the electronic device starts up, it is possible to know the error information that caused the power to be shut off last time.

  In the electronic device of the present invention, it is preferable that the control unit manages the number of errors detected by the monitoring circuit, and reports an error level according to the number of errors when an error is detected.

  According to this, the control unit manages the number of errors detected by the monitoring circuit, and when an error is detected, an error level corresponding to the number of errors is notified. Therefore, it is possible to know whether the error is minor or severe. Of course, the error level stage can be set as appropriate.

  The electronic device of the present invention is an electronic device including a power supply device that generates power system power and control system power, and includes a power switch composed of a lock switch, drive means driven by the power system power, and software. A control unit that is operated; an output circuit that is controlled by the control unit to output an enable signal; a drive circuit that controls power supplied to the drive unit based on the enable signal output from the output circuit; and the control The gist of the present invention is to provide a monitoring circuit that monitors the operation of the unit and shuts off the enable signal when there is an error. Here, the power supply device is not limited to the power supply device in which the primary power supply circuit and the secondary power supply circuit are connected in series, but is a power supply device in which power supply circuits for different voltages are connected in parallel and can individually shut off the power supply. May be.

  According to this, if the power switch is a lock switch, the lock switch remains on even if the power supply is cut off, so even if it is cut off once, it will be in a reset state and the electronic device will start up again, but an error will occur. When the occurrence occurs, the monitoring circuit cuts off the enable signal, so that the power supply to the driving means can be stopped without turning off the power supply device. Therefore, even if the power supply device cannot be shut off while the lock switch is on, the power supply to the driving means can be stopped when an error occurs.

  In the electronic device of the present invention, the output circuit outputs an enable signal corresponding to the data value written from the control unit, and the monitoring circuit drives the data value output from the control unit. It is preferable to monitor the writing to the circuit and shut off the enable signal if there is an error.

  According to this, the monitoring circuit monitors the writing of the data value output from the control unit to the driving circuit, and cuts off the enable signal when there is an error. As a result, power supply to the driving means is stopped. For example, when an error occurs, if the primary power supply circuit is cut off and the power supply to the driving means is cut off, the power generation of the secondary power supply circuit is also cut off, and the control system is also cut off. As a result, it becomes impossible to notify an error by displaying it or leave an error history. On the other hand, according to the electronic apparatus of the present invention, since the power supply to the driving means is shut off without shutting down the primary power supply circuit, it is possible to leave an error display and history.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows the configuration of a printer. As shown in the figure, a printer 10 (inkjet printer) as an electronic apparatus includes a primary power supply circuit 11 and a secondary power supply circuit 12 as a power supply device. The printer 10 includes a controller 13, motor drivers 14 and 15 connected to the controller 13, a head driver 16 and a display drive circuit 17, and a carriage motor 21 that is driven and controlled by these drivers (drive circuits), A paper feed motor 22, a recording head 23, and an operation panel 24 are provided. The operation panel 24 includes a display device 25, a power switch 26, and an operation switch 27. The display device 25 is for displaying various print menus, print condition information (paper size, print mode, etc.), error display, and the like. The power switch 26 is a switch operated when the printer 10 is turned on and when the power is turned off. The operation switch 27 is used for an operation for inputting a predetermined command, setting information, or the like to the printer 10, and selects, for example, a print execution switch, a maintenance switch, various menus and setting information displayed on the display device 25, and the like. A selection switch for determining the selected content, and a determination switch for determining the selected content.

  The primary power supply circuit 11 generates a power system voltage 42V from the commercial AC power supply 100V, and the secondary power supply circuit 12 reduces the output voltage of the primary power supply circuit 11 to generate a voltage 5V and a voltage 3.3V. The power system voltage 42V, which is the output voltage of the primary power supply circuit 11, is supplied to the motor driver 14, the motor driver 15 and the head driver 16. Of the output voltage of the secondary power supply circuit 12, the voltage 5V is supplied to the display drive circuit 17, and the voltage 3.3V is supplied to the controller 13.

  The controller 13 drives and controls the carriage motor 21 by outputting a control signal to the motor driver 14 to reciprocate a carriage (not shown) having the recording head 23 in the main scanning direction. In addition, the paper feed motor 22 is driven by outputting a control signal to the motor driver 15 and the rollers of the paper feed device, paper feed device, paper discharge device, etc. (not shown) are driven, thereby recording paper as a recording medium. Are conveyed in the sub-scanning direction. Further, by outputting a control signal to the head driver 16, ink droplets are ejected onto the recording head 23. In addition, the controller 13 outputs display data to the display drive circuit 17 to cause the display device 25 of the operation panel 24 to display contents corresponding to the display data.

  FIG. 2 shows a configuration of a controller that controls the motor driver. In FIG. 2, the motor drivers 14 and 15 that drive and control the carriage motor 21 and the paper feed motor 22 are basically the same in configuration. Therefore, for convenience of explanation, the carriage motor 21 and the paper feed motor 22 are referred to. The electric motor 28 will be described, the motor drivers 14 and 15 will be indicated, and the motor driver 18 will be described.

  The controller 13 is composed of, for example, a system-on-chip (SOC) in one chip, and includes a CPU 30, an ASIC 31 (Application Specific Integrated Circuit) (custom integrated LSI) as a custom LSI, a nonvolatile memory 32, a ROM 33, A RAM 34 and a motor driver interface (hereinafter referred to as “motor driver I / F 35”) are provided.

  The CPU 30 performs overall control of the printer 10 by executing a program (including a startup program) stored in the ROM 33 and a print control program (firmware program) as a control program stored in the nonvolatile memory 32. The RAM 34 temporarily stores various data obtained by the CPU 30 executing various programs.

  The CPU 30 executes the print control program to transmit data for controlling the driving of the electric motor 28 to the motor driver I / F 35 and causes the motor driver I / F 35 to output an enable signal based on the data, thereby The electric motor 28 is driven and controlled via the driver 18. The motor driver I / F 35 will be described in detail later.

  Further, the CPU 30 is configured to output a signal for controlling the primary power supply circuit 11 and the secondary power supply circuit 12, and can individually control the primary power supply circuit 11 and the secondary power supply circuit 12. When the power switch 26 is turned on in the printer 10, power based on the AC voltage from the commercial AC power supply is applied to the primary power supply circuit 11 and the secondary power supply circuit 12. The CPU 30 turns on at least one switch selected from the switches individually provided for the power system, the operation panel system, and the control system (logic system) in the primary power circuit 11 and the secondary power circuit 12. Thus, a voltage corresponding to each of the power system, the operation panel system, and the control system (logic system) can be applied to the corresponding part. The CPU 30 can shut off the primary power supply circuit 11 and the secondary power supply circuit 12 for each system by outputting a shutoff signal to each switch of the primary power supply circuit 11 and the secondary power supply circuit 12.

  The CPU 30 is connected to the display drive circuit 17, and transmits display data to the display drive circuit 17 to cause the display device 25 to display contents corresponding to the display data. The ASIC 31 incorporates various circuits for performing printing processing, and controls the printer 10 together with the CPU 30.

  The motor driver I / F 35 is an interface for transmitting a control signal for driving and controlling the electric motor 28 to the motor driver 18. An enable signal and other control signals (clock, data, strobe, reset signal, etc.) are output from the motor driver I / F 35 to the motor driver 18. The enable signal is a signal for controlling a current value supplied to the electric motor 28, and is sequentially updated every predetermined cycle time (for example, several tens of milliseconds) and used for torque control of the electric motor 28. The motor driver 18 is applied with the power system voltage 42V from the primary power supply circuit 11, and the built-in switching circuit (not shown) is turned on only during the time when the input enable signal is at the H level. A current having a value corresponding to the energization time is supplied to the electric motor 28.

  Next, the configuration of the motor driver I / F 35 will be described with reference to FIG. As shown in FIG. 3, the motor driver I / F 35 includes an A register 41, a B register 42, a timer 43, a register 44, a counter 45, a register 46, a comparator 47, an OR circuit (OR circuit) 48, and the like. Yes.

  The pulse waveform depicted at the lower right in the figure shows the current value (duty value) of one control cycle supplied from the motor driver 18 to the electric motor 28, and the base period “a ( current value control is performed by determining the energization time "b (msec.)" per "msec.)". In the A register 41, the base period “a” is stored as a 16-bit value. The B register 42 stores (writes) the energization time “b” as a 16-bit value as an enable value. The CPU 30 writes the values “a” and “b” in the A register 41 and the B register 42 based on the motor control setting data stored in advance in the nonvolatile memory 32 by executing the print control program. However, since the base period “a” is basically not changed, only the enable value “b” is normally rewritten, and the rewriting is performed every control cycle time (base period “a”).

  The rewriting of the enable value “b” is performed by data transfer performed between the CPU 30 and the motor driver I / F 35. The CPU 30 and the motor driver I / F 35 are connected by a WR line, an ADD line, a DATA (W) line, a DATA (R) line, and an RD line, and write data from the CPU 30 to the B register 42 and from the B register 42 to the CPU 30. The data can be read out. The CPU 30 refers to the motor control setting data and writes the enable value b to the B register 42 every control cycle time (base period a). In the figure, illustration of other buses is omitted.

  The timer 43 is a counter that counts “1” for each base period a based on a clock signal of a predetermined period (48 MHz in this example) from a clock circuit (not shown), and is a timer that counts the number of cycles in the base period a. Function.

  The counter 45 is a counter that counts the count signal input from the timer 43 and functions as a watchdog timer (WDT). The register 44 is connected to the WR line for the B register 42 and is a 1-bit register having a flag function that is turned on when a write signal (H level) is input. Is output and turned off after the reset signal is output. The counter 45 is reset when a reset signal is input from the register 44. Therefore, the counter 45 is reset every time the enable value b of the B register 42 is rewritten (updated).

  The register 46 stores a WDT set value. The WDT set value is a criterion for determining that an abnormality (including an abnormality in the print control program) has occurred in the CPU 30 that executes the print control program (firmware) when the enable value b is not rewritten for a set time. Is the set time. For example, a value within a range of 2 to 20 seconds is set as the WDT set value.

  The comparator 47 compares the count value of the counter 45 with the WDT set value set in the register 46, and outputs an H level signal when the count value is equal to or less than the WDT set value, and the count value exceeds the WDT set value. And an L level signal are output. Accordingly, when rewriting (updating) of the B register 42 is not performed even after the time corresponding to the WDT set value has elapsed, the L signal is output from the comparator 47.

  The OR circuit 48 inputs the output value (1 bit) of the comparator 47 and the value of the B register 42 (16-bit serial), and outputs a logical sum value. Therefore, the OR circuit 48 outputs the enable value b of the B register 42 when the output value of the comparator 47 is “1”. That is, since the value of the B register 42 is input in 16-bit serial, the OR circuit 48 outputs an enable signal that becomes H level for a length (time) corresponding to the enable value b. Further, when the output value of the comparator 47 becomes “0”, the output of the OR circuit 48 becomes L level and the enable signal is cut off.

  Therefore, if rewriting (updating) of the B register 42 is not performed for a set time (WDT set value) due to firmware abnormality or the like, the output of the OR circuit 48 becomes L level, and the driver I / F 35 outputs the electric motor. The enable signal to 28 is forcibly cut off. When the enable signal is cut off, that is, the enable value b becomes “0”, the current supply to the electric motor 28 is stopped.

  The register 49 receives the output of the comparator 47 and outputs an interrupt signal to the CPU 30 when the input becomes “0” at the time of abnormality. The CPU 30 receiving this interrupt signal from the motor driver I / F 35 recognizes that an abnormality has occurred in the motor control system. In addition to the print control program, the firmware program includes an abnormality monitoring routine program shown in the flowchart of FIG. The CPU 30 monitors the abnormality occurring in the printer 10 by executing this program every predetermined cycle time. However, the flowchart of FIG. 4 shows only a part related to the motor control system in the abnormality monitoring program.

Hereinafter, the abnormality monitoring routine will be described with reference to FIG.
First, in step S10, it is determined whether or not an interrupt signal has been input. If an interrupt signal is input, the process proceeds to step S20. If no interrupt signal is input, the routine is terminated. However, actually, when an interrupt signal is input, the processing jumps to the processing after step S20.

  In step S20, the number of errors is confirmed. The non-volatile memory 32 stores abnormality monitoring table data in which the error contents are shown for each type of abnormality monitoring input signal, such as the interrupt signal, divided according to the number of times of input. In addition, a predetermined storage area is provided for storing input number data (error number data) for each abnormality monitoring input signal. This input count (error count) is stored for a set period (for example, 10 days to 1 year) and is reset when the set period expires or when the firmware program is updated. . For example, the item relating to motor control system abnormality in the abnormality monitoring table data is set as “Minor error” when the interrupt signal is once, and “Severe error” when the interrupt signal is twice or more. In this step S20, the CPU 30 reads the number of past interrupt signal inputs from the predetermined storage area of the non-volatile memory 32, adds “1” for this time, and adds the current number of times of input (number of errors). ) To check the number of errors.

  In step S30, it is determined whether the number of errors is two or more. If it is not twice or more, that is, if this is the first time and this is the first time, the process proceeds to step S40. If it is two or more times, the process proceeds to step S50.

  In step S <b> 40, “Minor error” is displayed on the display device 25. That is, the CPU 30 refers to the abnormality monitoring table data, acquires the error content when the number of errors is “less than 2” (in this case, “minor error”), and displays the acquired error content on the display device 25. Let Here, the minor error refers to an error that is highly likely to be restored normally when the power is turned on again. For example, if the error is the first (first time), there is a high possibility that the error can be restored to normal. In such a case, for example, the text information “Please turn on the power again” is displayed.

  In step S50, a message “severe error” is displayed on the display device 25. That is, the CPU 30 refers to the abnormality monitoring table data, acquires the error content (in this case, “severe error”) when the number of errors is “two or more”, and displays the acquired error content on the display device 25. Let Here, the severe error refers to an error that is unlikely to be restored normally even when the power is turned on again. For example, when the error is repeated (twice or more), the possibility that the error can be restored normally is low. In such a case, for example, character information “Please call a service person” is displayed.

  In the next step S60, the error content is stored. That is, the CPU 30 stores the previously acquired error content in a predetermined storage area of the nonvolatile memory 32. Here, the error content to be stored may be the error content itself such as “minor error” or “severe error”, or may be data that can be assigned the error content, for example, the number of errors. When the error content itself is stored, the error count (input count) is also rewritten for updating.

  In the next step S70, the power supply is shut off. That is, the CPU 30 transmits a cutoff signal to the primary power supply circuit 11 and the secondary power supply circuit 12 to stop power supply to the power system, the operation panel system, and the control system (logic system). Of course, if the primary power supply circuit 11 is cut off, the secondary power supply circuit 12 is also cut off, so that the cut-off signal may be transmitted only to the primary power supply circuit 11.

As described above, according to the present embodiment, the following effects can be obtained.
(1) Since the enable signal is cut off when an abnormality occurs when the enable value b is no longer rewritten, the power supply to the electric motor 28 can be stopped and the secondary power supply circuit 12 is not cut off. An error can be displayed on the display device 35 of the operation panel 24.

  (2) An error of the CPU 30 executing the firmware program is written even if a time exceeding the WDT set value elapses by turning on the register 44 and resetting the counter 45 each time a WR signal for data writing is inputted. The software operation was judged to be abnormal when it was not done. Since the hardware circuit detects the abnormality of the software operation in this way, the abnormality of the software operation can be detected almost certainly.

  (3) When an error occurs when an interrupt signal is input, an error display process is performed, and the error content is immediately saved in the nonvolatile memory 32. For this reason, the error information remains in the nonvolatile memory 32 even after the user shuts off the power, so that the error content can be confirmed again at the next power-on or the like.

  (4) The number of errors was managed, and the error level was managed in stages according to the number of errors, with a minor error at the first time and a severe error at the second time. For this reason, for example, it is possible to instruct to turn on the power again at the first time, and to call a service person at the second time or more.

(Second Embodiment)
In the first embodiment, the error information is stored in the nonvolatile memory 32 after the error is displayed, and the power supply is not shut off. However, in the present embodiment, the power supply is promptly shut off when an error occurs. Hereinafter, description will be given according to the flowchart shown in FIG.

  First, in step S110, it is determined whether or not there is an error when the power is shut off. If the previous power shutdown is due to an error, the process proceeds to step S120. In most cases, however, the power switch 26 is turned off and the process proceeds to S130. Then, it is determined whether or not an interrupt signal is input (step S130), the number of errors is confirmed in the next step S140, and it is determined whether or not this time is two or more (step S150). If it is not two times or more but once, “minor error” is stored in the nonvolatile memory 32 as error information (step S160). If the number of errors is two or more, a message “severe error” is stored in the nonvolatile memory 32 (step S170). Thereafter, the power is turned off. That is, the CPU 30 shuts off the primary power supply circuit 11 and the secondary power supply circuit 12 (step S180). In this case, if an error occurs and an interrupt signal is input, the error information corresponding to the number of errors will be stored, and then the power will be turned off and it will disappear immediately even if an error is displayed. No special display. When the power is turned on again after the power-off due to the error and the printer 10 is started up, in the first step S110, it is determined that there was an error at the previous power-off. For example, if a flag is set at the time of the previous power-off and the flag is set to “1” when the power is turned on after the next power-on and the flag is “1”, it can be recognized that the previous power-off was caused by an error. "" Is displayed, the error content is displayed in step S120. For example, when “Minor error” was written at the time of shutting down the power last time, for example, “Turn on the power again” or “Severe error”, for example, “Call a service person.” Are displayed. Therefore, even when the power is shut off immediately after the error occurs and the error cannot be displayed, the error content can be known by being displayed at the next power-on.

In addition, embodiment of invention is not limited to the said embodiment, You may change as follows.
(Modification 1) In the above embodiment, the power supply is shut off, but it is not always necessary to shut off the power supply. Even if the power supply is not cut off, the enable signal is cut off, so that the supply of electric power to the electric motor 28 is stopped and there is no problem. Also with this configuration, it is possible to display an error in a state where power supply to the power system is stopped. In addition, in a model used for commercial use, a lock switch is used as the power switch 26. By turning on the lock switch, a large number of printers can be turned on with a single breaker operation. It is particularly effective to adopt this configuration in a printer of a model provided with various types of lock switches as the power switch 26. That is, if the lock switch is pressed and turned on, even if the primary power supply circuit is cut off, the power supply will be turned on again after it is once reset, but in this configuration where the enable signal is cut off, Even in a situation where the power supply cannot be cut off, the power supply to the power system can be cut off while utilizing the power supply to the operation panel system. In addition, since it is not necessary to cut off the power supply device in this way, the power supply device is not limited to the power supply device in which the primary power supply circuit and the secondary power supply circuit are connected in series in this example. The present invention can also be applied to an electronic device provided with a power supply device in which circuits are connected in parallel and can individually cut off power. In a model in which a lock switch is employed as the power switch 26, the power supply device cannot be shut off, but the power supply to the driving means such as an electric motor can be stopped, which is effective.

  (Modification 2) In the above-described embodiment, the CPU 30 is configured to shut off the power. However, the user who has confirmed the error display may operate the power switch 26 to shut off the power. In this case, the error display is performed promptly after the interrupt signal is input, but the storage of the error contents in the nonvolatile memory 32 may not necessarily be at the same time as the error display. For example, a configuration in which a user who has confirmed an error display writes error contents in the non-volatile memory 32 by using a short time until the shutdown process of the primary power supply circuit 11 performed by the CPU 30 when the power switch 26 is turned off. It can also be. Of course, at this time, the interruption processing end timing may be intentionally delayed, for example, by 0.5 to several seconds to secure the error content writing time.

  (Modification 3) In the above-described embodiment, the power is shut off by software processing by the CPU 30, but a configuration in which the power is shut off by hardware can also be adopted. For example, the signal (interrupt signal) of the register 49 in the motor driver I / F 35 is configured to be output to the primary power supply circuit 11 as a cutoff signal. In this case, it is desirable to provide a delay circuit in order to secure a time for writing the error contents in the nonvolatile memory 32. As the delay circuit, a counter for counting the delay time is provided. When an interrupt signal is input to the counter, the counter starts counting, and when the count time reaches the delay time, a signal output from the counter Is output to the primary power supply circuit 11. By doing so, it is possible to secure a time for writing error contents until the power is turned off.

  (Modification 4) In the above-described embodiment, error information is written to the nonvolatile memory 32 immediately after an error occurs. However, the timing for writing error information can be set as appropriate as long as the power is not shut off. For example, the error information may be rewritten from the RAM 34 to the nonvolatile memory 32 at the timing when the user operates the power switch 26. In this case, error information may be stored using a short time until the shut-off process for shutting down the primary power supply circuit 11 is completed. Further, in order to secure the error information write processing time after the power switch 26 is operated, a configuration may be adopted in which a delay circuit, a timer circuit, or the like is provided to delay the power-off timing.

  (Modification 5) In the said embodiment, although it was set as the structure which displays character information on the screen of the display apparatus 25 as a alerting | reporting part, another alerting | reporting part is employable. For example, error information may be displayed on the display device as an image. Further, the error content can be notified by voice or sound. For example, a sound notification unit, a sound notification unit such as a buzzer or a siren, and a lighting display unit such as an LED can be adopted.

  (Modification 6) In the above embodiment, the driving means is the electric motor 28, but the present invention is not limited to this. For example, a recording head can be used as a driving unit. Various actuators such as other linear motors, electric cylinders, piezoelectric actuators and solenoids can be used as driving means.

  (Modification 7) In the above embodiment, the electronic apparatus is embodied in the ink jet printer 10 as a liquid ejecting apparatus. However, the present invention is not limited to this, and liquid other than ink (the particles of the functional material are dispersed). It can also be embodied in a liquid ejecting apparatus that ejects liquid). For example, for manufacturing liquid chips and biochips for spraying liquid materials containing dispersed or dissolved materials such as electrode materials and color materials used in the manufacture of liquid crystal displays, EL (electroluminescence) displays, and surface-emitting displays. It may be a liquid ejecting apparatus that ejects a biological organic material to be used, or a liquid ejecting apparatus that ejects a liquid as a sample that is used as a precision pipette. The present invention may be applied to any one of these liquid ejecting apparatuses. Furthermore, the present invention can be applied to a wide variety of other electronic devices such as scanners, projectors, and digital cameras, as well as liquid ejecting apparatuses.

FIG. 2 is a block diagram illustrating an electrical configuration of the printer according to the first embodiment. The block diagram which shows the structure of the controller which controls a motor driver. The block diagram which shows the structure of motor driver I / F. The flowchart which shows an abnormality monitoring routine. The flowchart which shows the abnormality monitoring routine in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Printer as electronic equipment, 11 ... Primary power supply circuit, 12 ... Secondary power supply circuit, 13 ... Controller, 14, 15 ... Motor driver as drive circuit, 16 ... Head driver, 17 ... Display drive circuit, 18 ... Drive Motor driver as circuit, 21... Carriage motor as drive means, 22. Paper feed motor as drive means, 23... Recording head, 24... Operation panel, 25. DESCRIPTION OF SYMBOLS ... Operation switch, 28 ... Electric motor as drive means, 30 ... CPU as control part ... ASIC, 32 ... Non-volatile memory as non-volatile storage part, 33 ... ROM, 34 ... RAM, 35 ... Motor driver I / F, 41... A register, 42... B register constituting the output circuit, 43. Registers constituting the monitoring circuit, 45... Counter constituting the monitoring circuit, 46... Register constituting the monitoring circuit, 47... Comparator constituting the monitoring circuit, 48... OR circuit constituting the monitoring circuit and output circuit. Registers constituting the circuit, b... Enable value as a data value.

Claims (8)

An electronic device that inputs power system power generated by a primary power circuit and a secondary power circuit generates control system power,
Driving means driven by the power system power;
A control unit operated by software;
An output circuit that is controlled by the control unit and outputs an enable signal;
A drive circuit for controlling power supplied to the drive means based on an enable signal output from the output circuit;
An electronic apparatus comprising: a monitoring circuit that monitors the operation of the control unit and interrupts the enable signal when there is an error. The electronic device according to claim 1,
The output circuit outputs an enable signal corresponding to a data value written from the control unit,
The electronic circuit according to claim 1, wherein the monitoring circuit monitors writing of the data value output from the control unit to the driving circuit and blocks the enable signal when there is an error. The electronic device according to claim 1 or 2,
A non-volatile storage unit;
When an error is detected in the monitoring circuit, the control unit stores error information in the storage unit before the primary power supply circuit is shut off. The electronic device according to claim 3,
When an error is detected in the monitoring circuit, the control unit stores error information in the storage unit, and then the control unit shuts off a primary power supply circuit. The electronic device according to claim 4,
A notification unit for reporting an error;
After the control unit shuts down the primary power supply circuit based on the detection of an error in the monitoring circuit, it checks whether or not error information is stored in the storage unit when the electronic device is started up next time. If the error information is stored, the error information is notified by the notification unit. The electronic device according to any one of claims 1 to 5,
The electronic device is characterized in that the control unit manages the number of errors detected by the monitoring circuit, and notifies an error level according to the number of errors when an error is detected. An electronic device including a power supply device that generates power system power and control system power,
A power switch consisting of a lock switch;
Driving means driven by the power system power;
A control unit operated by software;
An output circuit that is controlled by the control unit and outputs an enable signal;
A drive circuit for controlling power supplied to the drive means based on an enable signal output from the output circuit;
An electronic apparatus comprising: a monitoring circuit that monitors the operation of the control unit and interrupts the enable signal when there is an error. The electronic device according to claim 7,
The output circuit outputs an enable signal corresponding to a data value written from the control unit,
The electronic circuit according to claim 1, wherein the monitoring circuit monitors writing of the data value output from the control unit to the driving circuit and blocks the enable signal when there is an error.

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