JP2009177867A - Electronic apparatus and standby current inspection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic apparatus that performs correct inspection of a standby current by detecting a leakage current caused by a circuit fault. <P>SOLUTION: In standby current inspection processing, a main power supply 11 is switched on from an inspection device 31 and an electronic apparatus 1 is in communicable state. An electronic apparatus control section 2 actuates a standby current inspection program by an instruction command for making a transition to a standby current inspection mode received at a communication section 16, and sets a standby current inspection flag (S31). The electronic apparatus control section 2 controls a charge control section 4 to stop charging of a sub-power supply 10 (S32) and to transit to a power saving standby state (S33). By a voltage monitoring section 7, the electronic apparatus control section 2 monitors the voltage of the main power supply 11 constantly (S34) and when a determination is made that the voltage of the main power supply 11 dropped below a predetermined level (Low) as a result of monitoring, the electronic apparatus control section 2 removes the standby current inspection flag (S35). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an electronic device and a standby current inspection system in which a chargeable sub-power supply is mounted and standby current is inspected.

  In production plants and maintenance service bases, standby current inspection is performed in the final inspection process of electronic devices. Here, the standby current is current consumption during standby power in which the main switch of the electronic device is off.

  With the recent energy saving, this standby current is reduced. Also, in portable electronic devices that use a primary battery or a secondary battery as the main power source, the standby current is about several tens of μA in consideration of storage with the battery inserted. There are many.

In the portable electronic device described above, a coin that can be charged from the main power supply to operate these functions so that the clock and settings can be maintained even when the main power supply is removed and stored. A secondary power source such as a type secondary battery is used (see Patent Document 1).
JP-A-8-122881

  However, in the conventional standby current inspection method, in the case of an electrical device having such a secondary power supply, the charging current for the secondary power supply is included in the original standby current, so the standard for standby current inspection including the charging current for the secondary power supply is included. The value was set and the inspection was done.

  For this reason, if the charging current to the secondary power supply is much higher than the standard value of the original standby current inspection, and the leakage current due to a circuit abnormality is equal to or less than the charging current, this leakage current is mixed into the charging current. Therefore, there is a problem that the leakage current due to the circuit abnormality cannot be accurately inspected.

  Accordingly, an object of the present invention is to provide an electronic device and a standby current inspection system that can detect a leakage current due to a circuit abnormality without being mixed in with a charging current and can accurately inspect a standby current. And

  In order to achieve the above object, an electronic device of the present invention includes a main power source, a sub power source charged from the main power source, a charge control means for controlling start and stop of charging to the sub power source, and a standby current test. And a transition means for transitioning to a process, wherein the charge control means stops charging from the main power source to the sub-power source when transitioning to the standby current inspection process.

  The standby current inspection system of the present invention is a standby current inspection system having an electronic device and an inspection device for inspecting the standby current of the electronic device, wherein the electronic device includes a main power source and a sub power source charged from the main power source. Charging control means for controlling the start and stop of charging of the sub power supply, and the inspection device transmits a command for executing standby current inspection processing of the electronic device, and supplies power to the main power supply. Power supply means, and current measurement means for measuring the current to the main power supply, and when the electronic device receives the command, the charge control means stops charging the main power supply to the sub power supply. And the said inspection apparatus measures the standby current of the said electronic device when the charge from the said main power supply to the said sub-power supply is stopped by the said current measurement means, It is characterized by the above-mentioned.

  The standby current inspection system of the present invention is a standby current inspection system having an electronic device and an inspection device for inspecting the standby current of the electronic device, wherein the electronic device includes a main power source and a sub power source charged from the main power source. A charge control means for controlling the start and stop of charging to the sub power supply, and a current measurement means for measuring the current to the main power supply, wherein the inspection device has a command for executing a standby current inspection process for the electronic device. A transmission means for transmitting; and a power supply means for supplying power to the main power supply. When the inspection apparatus transmits the command and the electronic device receives the command, the charge control means causes the main power supply to The charging of the electronic device is stopped and charging of the electronic device when the charging from the main power supply to the sub power supply is stopped is measured by the current measuring means. The features.

  According to the electronic device or the standby current inspection system of the present invention, it is possible to detect a leakage current due to a circuit abnormality without being lost in the charging current, and it is possible to accurately inspect the standby current.

  Embodiments of an electronic apparatus and a standby current inspection system according to the present invention will be described with reference to the drawings. The electronic device of this embodiment is applied to a portable electronic device.

[First Embodiment]
FIG. 1 is a block diagram showing a configuration of a standby current inspection system according to the first embodiment. This standby current inspection system includes an electronic device 1 and an inspection device 31. The electronic device 1 includes a main power supply 11, a main power supply circuit block 18, a sub power supply 10, a charge control unit 4, an information holding unit 5, a clock measurement unit 6, and the like. The main power supply circuit block 18 includes an electronic device control unit 2, a voltage monitoring unit 7, a communication unit 16, a key input unit 17, and a display unit 12.

  The electronic device control unit 2 is configured by a microcomputer that performs circuit control in a standby state or a normal operation state according to the operation state of the electronic device 1 in accordance with a program for controlling the entire electronic device 1. Generally, this control program is built in the electronic device control unit 2 or stored in an external mask ROM, flash memory, or the like.

  In addition, the electronic device control unit 2 writes and reads data related to setting information and control commands to the charging control unit 4, the information holding unit 5, the clock measurement unit 6, and the display unit 12 via the bus 8.

  The standby current inspection program 3 indicates a program related to the standby current inspection process among the control programs stored in the electronic device control unit 2, and the standby current inspection process is realized by executing this program. Details of the standby current inspection process will be described with reference to a flowchart described later. As a schematic operation, the electronic device control unit 2 receives a communication command for the communication unit 16 connected thereto to execute the standby current inspection program 3 or receives a specific key operation from the key input unit 17. Thus, the standby current inspection program 3 is executed.

  The charge controller 4 controls the start and stop of charging of the sub power supply 10. That is, the charging control unit 4 short-circuits (charges) the power supply connection path between the sub power supply 10 and the main power supply 11 according to the state set in the register according to the instruction of the electronic device control unit 2 via the bus 8. Start) or release (stop charging). The charge control unit 4 corresponds to the charge control means described in the claims.

  In addition, when charging is stopped to the sub power source 10 by the charging control unit 4, the charging current is not consumed, so that the standby current inspection with high accuracy can be performed in the standby current inspection mode.

  The information holding unit 5 is a storage memory for holding various setting information related to the electronic device 1 even when the power supply by the main power supply 11 is interrupted to the sub power supply 10. The information holding unit 5 is always supplied with power by the sub power supply 10.

  The clock measurement unit 6 has a real-time clock function for measuring date and time and a timer counter function, and can also notify the electronic device control unit 2 after the timer time set in the register has elapsed. The clock measuring unit 6 is always supplied with power by the sub power supply 10.

  The voltage monitoring unit (voltage detection means) 7 monitors the voltage of the main power supply 11, determines whether or not this voltage is equal to or lower than a predetermined voltage, and resets the electronic device control unit 2 according to the determination result. I do. In the present embodiment, the charging control unit 4, the information holding unit 5, and the clock measurement unit 6 are connected to the electronic device control unit 2 via the bus 8. Or a communication port.

  The sub power supply 10 is a rechargeable power supply such as a coin-type secondary battery or a supercapacitance. The limiting resistor 9 is a resistor that suppresses the charging current to the sub power supply 10. When the main power supply 11 supplies power to the sub power supply 10, charging is performed with the charging current Ic until the voltage of the sub power supply 10 reaches a predetermined charging voltage. This charging current Ic is sufficiently larger than the current Is flowing in the standby state of the main power supply circuit block 18 and the leakage current Il due to circuit abnormality.

  The main power supply 11 is a power supply unit that supplies power to the entire circuit of the electronic device 1. As the main power source 11, a DC power source, a primary battery typified by an AA battery, a secondary battery typified by a lithium ion battery, or the like can be used. It is also possible to supply power from the inspection power supply 35 of the inspection apparatus 31 to the main power supply 11.

  The display unit 12 includes a thin liquid crystal panel typified by a segment LCD method or a dot matrix TFT method, a display circuit thereof, and a video signal output circuit for displaying on a TV device or the like. The display unit 12 not only displays a menu during normal use in the electronic device 1 and other video signals, but also displays a warning display and an inspection result display when the sub power supply 10 is abnormal in the standby current inspection mode. It is also possible to do this.

  The inspection time setting unit 13 sets a preset initial value for the memory area reserved in the volatile memory 19 of the electronic device control unit 2 when the standby current inspection mode is shifted, An arbitrary time is set by the key input unit 17.

  The communication unit 16 is a communication circuit capable of transferring data by connecting the electronic device 1 and the inspection device 31 by wired serial communication, LAN, or wireless communication using infrared rays. Further, the communication unit 16 performs not only transmission / reception of communication data related to transition to the standby current inspection mode but also transmission / reception of various communication data in the general operation of the electronic device 1.

  As described above, the key input unit 17 is provided in the main power supply circuit block 18 and performs various operations such as push button input, direction key input, analog key input, touch panel input, capacitance detection input, and non-contact input. This is a circuit capable of key input. The key input unit 17 is also assigned various key operations in the general operation of the electronic device 1, such as main switch ON / OFF, selection switch, direction key input, setting switch, cancel switch, function switch, menu switch, and the like. Further, when the operation of a specific key related to the transition to the standby current inspection mode is recognized by the electronic device control unit 2 in the key input unit 17, the standby current inspection processing program is started.

  The main power supply circuit block 18 generally includes circuits to which power is supplied from the main power supply 11, and the power of current Is is supplied to the main power supply circuit block 18. Depending on the operating state of the electronic device 1, the operating current of each part in the main power supply circuit block 18 is also different, and the assumed current value of the current Is ranges from several tens of uA to several hundred mA.

  In the standby state, the electronic device control unit 2 performs a power saving operation such as switching the operating frequency to a low speed, and also stops the operation of the circuit unit that does not require the operation to turn off the circuit power to save power. Yes.

  The volatile memory 19 is a memory such as a RAM built in the electronic device control unit 2 and is allocated to a program work area, a variable area, a stack area, and the like of the electronic device 1. Further, a standby current inspection flag indicating a state of a standby current inspection mode described later is also secured in the volatile memory 19. Since the volatile memory 19 cannot retain the contents when the power supply from the main power supply 11 is stopped, it must be initialized at the time of startup.

  The communication terminal unit 20 is a terminal unit for the communication unit 16 of the electronic device 1 to communicate with the communication unit 36 of the inspection apparatus 31. The communication terminal unit 20 is used not only for communication with the inspection apparatus 31 but also as a communication terminal in general operation of the electronic device 1.

  On the other hand, the inspection device 31 performs standby current inspection of the electronic device 1. The inspection device 31 includes an inspection control unit 32, a current measurement unit 33, an inspection power source 35, a communication unit 36, and a display unit 34. The inspection control unit 32 is configured by a microcomputer that performs circuit control according to a program for controlling the entire inspection apparatus 31. In general, this control program is stored in a mask ROM, a flash memory, or the like that is built in or external to the inspection control unit 32.

  The inspection control unit 32 writes and reads data related to setting information and control commands to and from the current measurement unit (ammeter) 33, the inspection power source 35, the communication unit 36, and the display unit 34. The ammeter 33 measures the current from the inspection power supply 35 to the electronic device 1. The inspection control unit 32 reads the current value measured by the ammeter 33.

  The display unit 34 includes a thin liquid crystal panel typified by a segment LCD system and a dot matrix TFT system, and a display circuit thereof. The display unit 34 displays the result of inspection by the inspection control unit 32 from the measurement result of the ammeter 33. The inspection power source 35 is an inspection power source supplied to the main power source 11 of the electronic device 1. The power supply for inspection is supplied from a constant voltage source and has a function of stopping output in order to prevent a failure of the electronic device 1 when an overcurrent occurs due to a circuit abnormality. The communication unit 36 includes a communication circuit for communicating with the communication unit 16 via the communication terminal unit 20 of the electronic device 1, and can transmit and receive inspection information.

  FIG. 1 shows a circuit abnormality portion 99 indicating an unexpected circuit abnormality that has occurred in the electronic apparatus 1. For example, as a circuit abnormality, an adjacent pin short due to a solder failure, static electricity, or an IC operation abnormality due to temperature stress during mounting on the board can be considered. In the electronic device 1 having the circuit abnormality portion 99, a route of the current Il that cannot occur originally occurs.

  The operation of the standby current inspection system having the above configuration will be described. FIG. 2 is a flowchart showing a startup processing procedure of the electronic device 1. This processing program is stored in a storage medium (not shown) in the electronic device control unit 2 and is executed by the CPU in the electronic device control unit 2. When the main power supply 11 of the electronic device 1 is turned on by the user at the time of activation, the electronic device control unit 2 starts the activation process.

  First, the electronic device control unit 2 performs predetermined initial settings immediately after startup (step S1). After completion of the initial setting, the electronic device control unit 2 causes the electronic device 1 to shift to the power saving standby state by stopping the operation of the circuit unit that does not require operation and reducing the operation frequency (step S2).

  And the electronic device control part 2 acquires the key input state of the key input part 17, or the reception state of the communication part 16 (step S3). As a result of the acquisition, the electronic device control unit 2 determines whether or not a predetermined key operation for executing the standby current inspection program 3 has been performed, and whether or not a communication command for executing the standby current inspection program 3 has been received. (Step S4).

  When there is a predetermined key operation for executing the standby current inspection program 3, or when a communication command for executing the standby current inspection program 3 is received, the electronic device control unit 2 sets the standby current inspection program 3 to Execute (Step S5). Details of the standby current inspection process will be described later. Thereafter, the process returns to step S2.

  On the other hand, when it is not a predetermined key operation for shifting to the standby current inspection mode in step S4, the electronic device control unit 2 determines the operation state of the main switch (step S6). When the main switch is ON, the electronic device control unit 2 performs the main process of the electronic device 1 (step S7). Details of the main process of the electronic apparatus 1 will be described later. Thereafter, the electronic device control unit 2 ends this process. On the other hand, when the main switch is OFF, the electronic device control unit 2 returns to the process of step S3 again, and reacquires the key input state.

  In this way, the electronic device 1 continues to monitor the key state of the key input unit 17 in the standby state immediately after startup, and waits for a state change of either the main switch ON or the standby current inspection mode transition.

  FIG. 3 is a flowchart showing a main processing procedure of the electronic apparatus 1 in step S7. The electronic device control unit 2 first confirms the content of the standby current inspection flag (step S11). When the standby current inspection flag is set, the electronic device control unit 2 proceeds to the process of step S13 as it is. On the other hand, when the standby current inspection flag is not set and is released, the electronic device control unit 2 instructs the charging control unit 4 to start (or resume) charging of the sub power supply 10 (step). S12).

  The electronic device control unit 2 performs initial setting of the communication unit 16 and sets the communication unit 16 in a state in which communication is possible from the inspection device 31 or an external device (not shown) (step S13). The electronic device control unit 2 turns on the power of the display unit 12 and performs settings related to a predetermined display (step S14).

  Furthermore, the electronic device control unit 2 performs various settings for operating the circuit related to the function of the electronic device 1, and enables the electronic device 1 to operate normally (step S15). For example, when the electronic device 1 is a music playback device, a circuit related to the function of the electronic device 1 is a circuit that converts stream data into a sound signal in music playback, an output circuit to headphones, and the like. When the electronic device 1 is an electronic imaging device, the circuits related to the functions of the electronic device 1 include a lens driving circuit, a shutter circuit, a photometry / ranging circuit, an image sensor composed of a CCD or a CMOS, and an analog-digital conversion circuit. An image processing circuit.

  The electronic device control unit 2 acquires the key input state of the key input unit 17 (step S16). When there is a key input operation, the electronic device control unit 2 performs processing related to each function of the electronic device 1 in accordance with the key input operation (step S17). After executing this process, the electronic device control unit 2 returns to the process of step S16 again and acquires the key input state.

  If the key input operation has not been updated as a result of acquiring the key input state in step S16, the electronic device control unit 2 checks the state of the main switch (step S18). When the main switch is turned off, the electronic device control unit 2 checks the standby current inspection flag (step S19).

  When the standby current inspection flag is set, the standby current inspection program 3 is executed as in step S5 (step S20). Details of the standby current inspection process will be described later. Thereafter, the electronic device control unit 2 returns to the process of step S11. If the standby current inspection flag is not set in step S19, the electronic device control unit 2 returns to the standby process in step S2 of FIG. 2 in order to shift to the normal standby state.

  On the other hand, when the main switch remains ON in step S18, the electronic device control unit 2 confirms the presence or absence of a communication command from the inspection device 31 or other external device in the reception buffer of the communication unit 16 (step S21). ). When the communication command is not received, the electronic device control unit 2 returns to the process of step S16 and confirms the update of the key input operation again.

  On the other hand, when the communication command is received, the electronic device control unit 2 analyzes the received communication command (step S22). As a result of the analysis, the electronic device control unit 2 determines whether or not the communication command is a command related to execution of the standby current inspection program 3 (step S23). When the communication command is a command related to the execution of the standby current inspection program 3, the electronic device control unit 2 executes the standby current inspection program 3 in step S20.

  On the other hand, when the received communication command is various commands related to the normal operation in step S23, the electronic device control unit 2 executes processing according to the command (step S24). Thereafter, the electronic device control unit 2 returns to the process of step S16.

  As described above, since the electronic device 1 is less affected by the charging current in the normal operation state, when the electronic device 1 is switched from the standby state to the normal operation state, the charging of the sub power source 10 is resumed and the voltage drop of the sub power source 10 is reduced. . Further, since it is possible to shift to the standby current inspection mode by communication, it is possible to perform a quick standby current inspection in conjunction with other inspections during the inspection process. In the standby current inspection mode, the standby current inspection is performed using the electronic device 1 and the inspection device 31 as described later. In this standby current inspection, power is supplied from the inspection device 31 to the main power supply 11. In addition, the voltage of the power supply supplied to the main power supply 11 from the inspection apparatus 31 is set higher than the voltage of the main power supply 11 of the electronic device 1 input by the user at the time of starting.

  FIG. 4 is a flowchart showing the standby current inspection process in steps S5 and S20. First, the electronic device control unit 2 sets a standby current inspection flag indicating a standby current inspection mode in a predetermined area of the volatile memory 19 (step S31).

  The electronic device control unit 2 causes the charge control unit 4 to stop charging the sub power source 10 (step S32). After the charging to the sub power supply 10 is stopped, the electronic device control unit 2 stops the operation of the circuit unit that does not need to operate and shifts the operating frequency to a power saving standby state (step S33).

  In this power saving standby state, the electronic device control unit 2 constantly monitors the voltage of the main power supply 11 by the voltage monitoring unit 7 (step S34). That is, when it is determined that the voltage of the main power supply 11 monitored by the voltage monitoring unit 7 is higher than the predetermined voltage (High), the electronic device control unit 2 repeats the process of step S34 and continues monitoring. The predetermined voltage may be, for example, the voltage of the main power supply 11 that is turned on by the user at the time of startup.

  On the other hand, as a result of monitoring, when it is determined that the voltage of the main power supply 11 drops and is equal to or lower than the predetermined voltage (Low), the electronic device control unit 2 stops supplying power from the inspection device 31 to the main power supply 11. Then, reset control is performed (step S35). In this reset control, the electronic device control unit 2 cancels the standby current inspection flag and initializes the volatile memory 19 including the standby current inspection flag. Thereafter, the electronic device control unit 2 returns to the process of step S2 or S11 in the original process. Note that the process of step S35 corresponds to a canceling unit.

  FIG. 5 is a flowchart showing the operation of the inspection apparatus 31 when the standby current inspection is performed. The operation program of the inspection apparatus 31 is stored in a storage medium (not shown) in the inspection control unit 32 and is executed by the CPU in the inspection control unit 32. In order to start the inspection, the inspection power source 35 is turned on by the user. First, the inspection control unit 32 supplies power to the main power supply 11 of the electronic device 1 (step S41). And the test | inspection control part 32 transmits the command command (command) for performing the stand-by current test | inspection program 3 to the communication part 16 of the electronic device 1 via the communication part 36 (step S42).

  The inspection control unit 32 waits for a sufficient time for the electronic device 1 to execute the standby current inspection program 3, and measures the current value supplied to the main power supply 11 of the electronic device 1 by the ammeter 33 (step S43). .

  The inspection control unit 32 compares the current value measured in step S43 with the inspection standard value, determines whether or not the measured current value falls within the range of the standard value, and displays the determination result on the display unit 34. (Step S44). That is, if the result of determination is normal, only the current Is flowing through the main power supply circuit block 18 is measured in the measurement of step S43. On the other hand, when the circuit abnormal part 99 has occurred, the measured current value is obtained by adding the leakage current Il to the current Is. Here, by setting the inspection standard value of the standby current within a range assumed so that the leakage current Il can be detected, an abnormality due to the leakage current Il can be determined.

  When the inspection is completed, the inspection control unit 32 stops the inspection power source 35 and stops the power supply to the main power source 11 of the electronic device 1 (step S45). Then, the inspection control unit 32 ends this process.

  In the standby current inspection method using the electronic device and the inspection device according to the first embodiment, in the standby current inspection mode, the electronic device stops the charging current and shifts to the standby state. Perform the inspection. As a result, an accurate standby current inspection that does not include the charging current can be performed.

  In this embodiment, the standby current inspection flag is set in the volatile memory 19, but the standby current inspection flag may be set in a backupable memory such as the information holding unit 5. Thereby, even if the power supply of the main power supply 11 is stopped, the setting becomes effective. If the main power supply 11 is frequently turned on and off in an inspection process or the like, the setting information is retained, so that the number of times of setting of the standby current inspection mode can be reduced.

  The predetermined key operation for shifting to the standby current inspection mode in step S4, the setting of the standby current inspection flag in step S19, or the command relating to the transition of the standby current inspection in step S23 is the standby current inspection described in the claims. It corresponds to an instruction means for instructing.

[Second Embodiment]
Since the configurations of the electronic device and the inspection apparatus in the second embodiment are the same as those in the first embodiment, description thereof will be omitted. Here, operations different from those of the first embodiment are shown.

  FIG. 6 is a flowchart showing the standby current inspection process in steps S5 and S20 of the second embodiment. The standby current inspection processing program 3 is stored in the electronic device control unit 2 and is executed by the CPU in the electronic device control unit 2.

  When the electronic device control unit 2 starts up the standby current inspection program 3, first, the time setting value of the inspection time setting unit 13 is set in the register of the timer counter function in the clock measurement unit 6 (step S51). Then, the electronic device control unit 2 causes the charge control unit 4 to stop charging the sub power source 10 (step S52).

  After stopping the charging of the sub power supply 10, the electronic device control unit 2 stops the operation of the circuit unit that does not need to operate, and lowers the operating frequency to shift to the power saving standby state (step S53).

  Immediately after this, the electronic device control unit 2 starts the operation of the timer counter function in the clock measurement unit 6 (step S54). The timer counter function counts down one count at a time. The electronic device control unit 2 waits for the timer counter to become 0 or less by the notification from the clock measurement unit 6 (step S55). When the timer counter becomes 0 or less, the timepiece measurement unit 6 notifies the electronic device control unit 2 that the timer counter has elapsed. In addition, the process of step S54 and step S55 is equivalent to a time measurement means.

  When the electronic device control unit 2 receives a notification of the progress of the timer counter from the clock measurement unit 6, the electronic device control unit 2 causes the charge control unit 4 to resume charging to the sub power source 10 (step S56). Thereafter, the electronic device control unit 2 returns to the process of step S2 or step S11 in the original process. In this standby current inspection process, the standby current inspection flag is not used and remains set as an initial value.

  As described above, the electronic device according to the second embodiment stops the charging current and executes the standby current inspection program 3 only within a predetermined time after shifting to the standby state. During this time, the standby current can be inspected by the inspection device. Therefore, forgetting to release the standby current inspection flag can be reduced. In addition, it is possible to keep charging to the sub power source to a minimum.

[Third Embodiment]
FIG. 7 is a block diagram showing a configuration of an electronic device for standby current inspection in the third embodiment. The same components as those of the electronic device of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. Here, different configurations and operations will be described.

  The electronic device 1 is provided with a current monitor circuit 14 and a current measurement unit 15. Since the range of the load current varies depending on the operating state of the electronic device 1, the current monitor circuit 14 has a circuit that switches the value of the current monitor resistor depending on the load.

  At the time of current measurement using the current monitor circuit 14, the current measurement unit 15 measures and measures the voltage across the current monitor resistor appropriately selected according to the operation state of the electronic device 1 by performing AD conversion. A current value is calculated from the both-end voltage and the selected current monitor resistance value. The result is stored in the volatile memory 19.

  The electronic device control unit 2 is configured by a microcomputer, and reads the current value measured by the current measurement unit 15 and stored in the volatile memory 19 via the bus 8 to make a determination. Thereby, an electric current test | inspection is attained by the electronic device 1 single-piece | unit.

  An operation of the electronic apparatus 1 having the above configuration will be described. FIG. 8 is a flowchart showing the standby current inspection process. The standby current inspection processing program 3 is stored in the electronic device control unit 2 and is executed by the CPU in the electronic device control unit 2.

  When the electronic device control unit 2 starts the standby current inspection processing program 3, the electronic control unit 2 first causes the charge control unit 4 to stop charging the sub power supply 10 (step S61). After the charging to the sub power supply 10 is stopped, the electronic device control unit 2 shifts to the power saving standby state by stopping the operation of the circuit unit that does not require operation and lowering the operation frequency (step S62).

  The electronic device control unit 2 switches the current monitor resistance of the current monitor circuit 14 to a resistance value for standby current inspection, and the current measurement unit 15 measures the voltage across the current monitor resistor. Furthermore, the electronic device control unit 2 calculates a standby current from the measured voltage value and the current monitor resistance, and stores the standby current in the volatile memory 19 (step S63). In addition, the process of step S63 using the current monitor circuit 14 and the current measurement unit 15 corresponds to a current measurement unit.

  When the acquisition of the standby current is completed, the electronic device control unit 2 causes the charge control unit 4 to resume charging the sub power supply 10 (step S64). And the electronic device control part 2 turns on the power supply of the display part 12, and performs the setting regarding a display operation (step S65).

  The electronic device control unit 2 compares the measured current value with the inspection standard value, determines whether or not the measured current value falls within the range of the standard value, and displays the determination result on the display unit 12. Notification is made (step S66). In addition, the process of step S66 which displays a determination result on the display part 12 is corresponded to a display means.

  If the determination in step S66 is normal, only the current Is flowing through the main power supply circuit block 18 is measured in the process of step S63. On the other hand, when the circuit abnormal part 99 has occurred, a current obtained by adding the leakage current Il to the current Is is measured. By setting a range assumed so that the leakage current Il can be detected as the range of the standby current standard value, an abnormality due to the leakage current Il can be determined.

  As described above, according to the electronic device of the third embodiment, in the standby current inspection mode, by performing current measurement by itself, a special measurement circuit such as an inspection device is not necessary, and the standby current self-diagnosis can be performed. It becomes possible. That is, it is possible to easily check the standby current abnormality by shifting to the standby current inspection mode and measuring the standby current in the electronic device.

  The present invention is not limited to the configuration of the above-described embodiment, and any configuration can be used as long as the functions shown in the claims or the functions of the configuration of the present embodiment can be achieved. Is also applicable.

  For example, in each of the above embodiments, the standby current inspection process is always performed in the following cases. That is, if there is a predetermined key operation for shifting to the standby current inspection mode in step S4, if the standby current inspection flag is set in step S19 when the main switch is OFF, or if the standby current inspection program 3 is set in step S23. When a command related to execution of is issued, the above processing is performed. Even in such a case, the voltage monitoring unit 7 is configured to be able to monitor the voltage state of the sub power supply. When this voltage is equal to or lower than the threshold value, the standby current inspection program 3 is prohibited from being executed. You may notify that a power supply is in a low voltage state, and may charge a sub-power supply. This makes it possible to quickly recover the voltage of the sub power supply.

  Further, the electronic device of the present invention is not limited to portable electronic devices such as music playback devices and electronic imaging devices, and can be applied to various stationary electronic devices.

1 is a block diagram illustrating a configuration of a standby current inspection system according to a first embodiment. 4 is a flowchart showing a startup process procedure of the electronic device 1. It is a flowchart which shows the main process of the electronic device 1 in step S7. It is a flow chart which shows standby current inspection processing in Steps S5 and S20. It is a flowchart which shows operation | movement of the test | inspection apparatus 31 when performing standby | standby electric current test | inspection. It is a flow chart which shows standby current inspection processing in Steps S5 and S20 of a 2nd embodiment. It is a block diagram which shows the structure of the electronic device for the standby current test | inspection in 3rd Embodiment. It is a flowchart which shows a standby current inspection process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic device 2 Electronic device control part 4 Charge control part 6 Clock measuring part 10 Sub power supply 11 Main power supply 14 Current monitor circuit 15 Current measuring part 31 Inspection apparatus 32 Inspection control part 33 Ammeter

Claims (9)

A main power source, a sub power source charged from the main power source, charge control means for controlling start and stop of charging to the sub power source, and transition means for shifting to standby current inspection processing,
When the process proceeds to the standby current inspection process, the charging control unit stops charging from the main power source to the sub power source.   The electronic apparatus according to claim 1, further comprising a release unit that cancels the standby current inspection process.   Voltage detection means for detecting the voltage of the main power supply is provided, and when the voltage of the main power supply detected by the voltage detection means falls below a predetermined voltage, the release means releases the standby current inspection process. The electronic device according to claim 2.   A time measuring unit for measuring a time after the transition to the standby current inspection process, and when the time measured by the time measuring unit has passed a predetermined time, the release unit cancels the standby current inspection process. The electronic device according to claim 2.   5. The electronic device according to claim 2, wherein the release control unit cancels the standby current inspection process, whereby the charge control unit resumes charging the sub power source. 6. .   2. The apparatus according to claim 1, further comprising: a current measuring unit that measures a standby current of the electronic device after charging from the main power source to the sub power source is stopped; and a display unit that displays a result of the measurement. The electronic device of any one of thru | or 5. Voltage monitoring means for monitoring the voltage of the sub power supply,
7. The charging from the main power source to the sub power source is prohibited by prohibiting the transition to the standby current inspection process when the voltage of the sub power source is equal to or lower than a set threshold value. The electronic device according to any one of the above. In a standby current inspection system having an electronic device and an inspection device for inspecting the standby current of the electronic device,
The electronic device includes a main power source, a sub power source charged from the main power source, and charge control means for controlling start and stop of charging to the sub power source, and the inspection device performs standby current inspection of the electronic device. A transmission unit that transmits a command to execute processing; a power supply unit that supplies power to the main power source; and a current measurement unit that measures a current to the main power source,
When receiving the command, the electronic device stops charging from the main power source to the sub power source by the charging control means, and the inspection device charges the main power source to the sub power source by the current measuring means. A standby current inspection system for measuring a standby current of the electronic device when the operation is stopped. In a standby current inspection system having an electronic device and an inspection device for inspecting the standby current of the electronic device,
The electronic device includes a main power source, a sub power source charged from the main power source, a charge control unit for controlling start and stop of charging to the sub power source, and a current measuring unit for measuring a current to the main power source. The inspection apparatus includes a transmission unit that transmits a command to execute a standby current inspection process of the electronic device, and a power supply unit that supplies power to the main power source,
When the inspection apparatus transmits the command and the electronic device receives the command, the charging control unit stops charging from the main power source to the sub power source, and the current measuring unit from the main power source A standby current inspection system for measuring a standby current of the electronic device when charging to a sub power supply is stopped.

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