JP5723938B2 - Electronic equipment and electronic equipment system - Google Patents

Description

  The present invention relates to an electronic device and an electronic device system that can charge a secondary battery mounted on a portable terminal or the like.

  Electronic devices such as smartphones have been improved in performance and multifunction, and the capacity of secondary batteries used has increased (capacity increased), and the charging current has increased accordingly. Proposals have been made in which the performance of secondary batteries and the risk of heat generation are avoided (see, for example, Patent Document 1).

  Patent Document 1 relates to a battery charging device, and relates to a battery charging device. When a voltage value at both ends of a battery is smaller than an end-of-charge voltage value, a charging control unit that controls the output of a charging power supply unit so as to charge the battery at a required constant power value. It has. In addition, the abnormality determination time and the abnormality determination current change amount are acquired, and charging including a battery or the like is performed depending on whether or not the change amount of the charging current value in the time longer than the abnormality determination time is smaller than the abnormality determination current change amount. The circuit abnormality is judged.

JP 2009-11068 A

  In Patent Document 1, a charging current value supplied to a battery is acquired by a current detector and an abnormality is determined. However, the current detector (switch unit) may fail. If a failure occurs, an abnormality in the charging current is not detected, and leaving such a state may increase the risk of overcharging and heat generation. However, no technology corresponding to these risks has been proposed.

  The present invention has been made in view of the above-described reasons, and an object thereof is to provide an electronic device and an electronic device that include an electronic device that can determine a failure in the electronic device and improve the safety of charging a secondary battery. To provide a system.

  An electronic device according to the present invention is an electronic device including a secondary battery that can be charged by a charger, and generates an output request command for requesting the charger to output a charging current to the electronic device. A signal connection unit that transmits the output request command to the charger, a charging connection unit that is supplied with the charging current from the charger that has received the output request command, and the output request command A switch unit capable of switching an electric circuit through which a charging current from the charging connection unit flows from a cut-off state to a conductive state after a predetermined time has elapsed after generation; and a first timing after the output request command is generated and before the predetermined time has elapsed And at a second timing after the lapse of the predetermined time, a current monitoring unit that monitors the presence or absence of the charging current flowing in the electric circuit, and a current monitoring unit Depending on the presence or absence of Denden stream, and a malfunction determination part for determining the presence or absence of abnormality of the switch unit.

  As one aspect of the electronic device of the present invention, for example, when the abnormality determination unit determines that the switch unit is abnormal, the abnormality determination unit generates an output stop command that orders the stop of the charging current, and the signal connection unit stops the output. Send a command to the charger.

  For example, the electronic apparatus according to the present invention further includes a delay circuit that receives an output request command from the output request unit and transmits the output request command to the switch unit after the predetermined time has elapsed.

  As one aspect of the electronic device of the present invention, for example, when the current monitoring unit detects a charging current flowing through the electric circuit at the first timing, the abnormality determining unit is configured to cause the switch unit to block the electric circuit. It is determined that the abnormal state cannot be realized.

  As one aspect of the electronic device of the present invention, for example, when the current monitoring unit does not detect a charging current flowing through the electric circuit at the second timing, the abnormality determining unit is configured so that the switch unit conducts the electric circuit. It is determined that the abnormal state cannot be realized.

  The electronic device of the present invention includes an electronic device and a charger.

  The electronic device of the present invention is an electronic device including a secondary battery that can be charged by a charger, and from a charger, a power output unit to which a charging current is supplied, and after a predetermined time has elapsed since the supply of the charging current, A switch unit capable of switching an electric circuit through which a charging current from the power output unit flows from a cut-off state to a conductive state; a first timing before the predetermined time has elapsed; and a second timing after the predetermined time has elapsed. A current monitoring unit that monitors the presence or absence of the charging current flowing through the current monitoring unit, and an abnormality determination unit that determines whether or not the switch unit is abnormal in accordance with the presence or absence of the charging current from the current monitoring unit.

  As one aspect of the electronic device of the present invention, for example, when the abnormality determination unit determines that the switch unit is abnormal, the abnormality determination unit generates an output stop command that orders the stop of the charging current, and transmits the command to the power output unit. The power output unit stops the charging current.

  As one aspect of the electronic apparatus of the present invention, for example, a delay circuit is further provided that transmits a command to switch the electric circuit from a cut-off state to a conductive state to the switch unit after the predetermined time has elapsed.

  As one aspect of the electronic device of the present invention, for example, when the current monitoring unit detects a charging current flowing through the electric circuit at the first timing, the abnormality determining unit is configured to cause the switch unit to block the electric circuit. It is determined that the abnormal state cannot be realized.

  As one aspect of the electronic device of the present invention, for example, when the current monitoring unit does not detect a charging current flowing through the electric circuit at the second timing, the abnormality determining unit is configured so that the switch unit conducts the electric circuit. It is determined that the abnormal state cannot be realized.

  The electronic device system of the present invention includes an electronic device and a charger.

  In the present invention, the electronic device side is provided with a switch unit capable of switching the electric path through which the charging current flows from the cut-off state to the conductive state, and at the first timing before the predetermined time has elapsed and the second timing after the predetermined time has elapsed, The presence or absence of an abnormality in the switch unit is determined according to the presence or absence of a charging current flowing through the electric circuit. Therefore, it is possible to easily find an abnormality due to a failure of the switch unit in the electronic device, and to charge the secondary battery safely. In addition, the electronic device itself can determine an abnormality in the electronic device, and can prevent the risk of overcharging the secondary battery and heat generation in the electronic device.

1 is a block diagram showing an example of a first embodiment of an electronic device and an electronic device system according to the present invention. 1 is a table showing an example of an abnormality determination state according to the first embodiment of the present invention; (a) a normal state; (b) an abnormality at a first timing; and (c) an abnormality at a second timing. The signal chart figure which shows an example of the abnormality determination state which concerns on the 1st Embodiment of this invention, (a) 1st timing, (b) 2nd timing. The flowchart figure which shows an example of the operation | movement which concerns on the 1st Embodiment of this invention. The block diagram which shows an example of 2nd Embodiment of the electronic device and electronic device system which concern on this invention. The signal chart figure which shows an example of the abnormality determination state which concerns on the 2nd Embodiment of this invention, (a) 1st timing, (b) 2nd timing. The flowchart figure which shows an example of the operation | movement which concerns on the 2nd Embodiment of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of an electronic device and an electronic device system according to the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a block diagram showing an example of a first embodiment of an electronic device and an electronic device system according to the present invention.

  The electronic device system includes a charger 10 and an electronic device 20. The charger 10 includes a plug that can be electrically connected to an external commercial AC power source, and includes a rectifier 11, a power output unit 12, and an output control unit 13. Further, the charger 10 acquires a signal sent from the electronic device 20 and a charging connection portion P that is directly or electrically connected to a charging cable K made of USB or the like that can be electrically connected to the electronic device 20. A signal connection S is provided.

  The rectifier 11 is an AC / DC converter. The power output unit 12 outputs power suitable for the electronic device 20 to be charged based on the power converted by the rectifier 11. The output control unit 13 conducts and cuts off (ON / OFF) the power supplied from the power output unit 12 based on a signal from the electronic device 20.

  The electronic device 20 includes a terminal unit 30 and a secondary battery 40 that is built in the electronic device 20 and is detachable from the terminal unit 30. The electronic device 20 is a mobile device that is operated by the secondary battery 40, such as a mobile phone such as a smartphone, a mobile terminal such as a tablet, a digital camera, a portable personal computer, and a wireless device. The terminal unit 30 includes a switch unit 31, a current monitor unit 32, an output request unit 33, a delay circuit 34, an abnormality determination unit 35, a charging connection unit Q, a signal connection unit T, and these electrically. And an electric circuit 36 to be connected.

  The switch unit 31 switches between interruption and conduction of the charging current flowing through the electric circuit 36. The current monitor unit 32 monitors the presence or absence of a charging current flowing through the electric circuit 36. The output request unit 33 has a control function including a microcomputer and generates an output request command for requesting the charger 10 to output a charging current to the electronic device 20. The delay circuit 34 receives the output request command from the output request unit 33 and transmits the output request command to the switch unit 31 after a predetermined time has elapsed. The abnormality determination unit 35 determines the presence / absence of an abnormality in the switch unit 31 according to the presence / absence of the charging current from the current monitor unit 32. The charging connection portion Q is, for example, a connector that is electrically connected to the charging connection portion P of the charger 10 via the charging cable K, and the signal connection portion T is similarly charged via the charging cable K. 10 signal connections S are electrically connected.

  The secondary battery 40 is, for example, a secondary battery such as a lithium ion secondary battery or a nickel hydride secondary battery. The secondary battery 40 is charged by the power supplied from the external charger 10 or the like, and is supplied to the terminal unit 30 by the charged power. Operate the various configurations provided. Further, the secondary battery 40 includes a PTC (Positive Temperature Coefficient) 41 having a positive resistance temperature characteristic for monitoring the temperature in the secondary battery 40, a battery cell 42, and a protection circuit (protection FET) 43. ing.

  FIG. 2 is a table showing an example of an abnormality determination state according to the present invention. (A) is a normal state, (b) is an abnormality at the first timing, and (c) is an abnormality at the second timing. Show.

<Normal state: FIG. 2 (a)>
Before the charger 10 is connected to the electronic device 20, the switch part 31 of the electronic device 20 is in a cut-off state (OFF) (see charging unconnected: see). When the charger 10 is connected to the electronic device 20, the charging of the secondary battery 40 is started, but the switch unit 31 maintains the cutoff state before a predetermined time counted by the output request unit 33, A charging current does not flow through the electric path 36. Therefore, the value of the charging current measured by the current monitoring unit 32 is 0 A (“no” state where no charging current flows) (first timing: reference). When a predetermined time elapses, the switch unit 31 enters a conductive state (ON) in which a charging current can flow through the electric circuit 36 by a signal from the delay circuit 34. Then, the current monitoring unit 32 detects the value (for example, 4 A) of the charging current (a state where the charging current is “present”) (second timing: see).

  When the switch part 31 is functioning normally, it is the above-mentioned normal state and the determination of the abnormality determination part 35 is "OK". Further, the current monitor unit 32 constantly monitors the presence or absence of a charging current that is a basis for the determination by the abnormality determination unit 35. Since the monitoring timing is before the predetermined time has elapsed and after the predetermined time has elapsed, the time before the predetermined time has elapsed will be described as the first timing, and the time after the predetermined time has elapsed will be described as the second timing.

<Abnormal state: FIG. 2 (b)>
At the first timing, when the switch unit 31 is broken and is in a conductive state, the current monitor unit 32 detects the value of the charging current (for example, 4A). In the “present” state in which the charging current is detected, the abnormality determination unit 35 determines that the switch unit 31 is in an abnormal state in which the electric circuit 36 cannot be interrupted, and determines the abnormality determination “NG”. Perform (first timing: see).

<Abnormal state: FIG. 2 (c)>
At the first timing, even if the switch unit 31 breaks down and is in the cut-off state, at the first timing, it is the same as the normal state, and the value of the charging current in the current monitor unit 32 is 0A “None”. It is measured, and the determination of the abnormality determination unit 35 is “OK”. However, at the second timing, the current monitoring unit 32 measures the charge current “none” with a charge current value of 0A. In the “no” state where the charging current is not flowing, the abnormality determination unit 35 determines that there is an abnormal state in which the switch unit 31 cannot realize the conduction of the electric path 36 and performs the abnormality determination “NG” ( Second timing: see).

  As described above, the switch unit 31 that can switch the electric path 36 through which the charging current flows on the electronic device 20 side from the cut-off state to the conductive state is provided in the electronic device 20. Then, at the first timing before the predetermined time elapses and at the second timing after the predetermined time elapses, the abnormality of the switch unit 31 is determined according to the presence or absence of the charging current flowing in the electric circuit 36 monitored by the current monitor unit 32. Determine presence or absence. Therefore, an abnormality due to a failure of the switch unit 31 in the electronic device 20 can be easily found, and the secondary battery 40 can be charged safely. Further, the electronic device 20 itself can determine an abnormality in the electronic device 20 and can prevent the risk of overcharging the secondary battery 40 and heat generation in the electronic device 20 in advance. .

  FIG. 3 is a signal chart showing an example of an abnormality determination state according to the first embodiment of the present invention, where (a) shows a first timing and (b) shows a second timing. The value of the charging current in the normal state is indicated by a solid line, and the value of the charging current in the abnormal state is indicated by a broken line. The upper row shows the value of the charging current monitored by the current monitor unit 32 of the electronic device 20, and the lower row shows the value of the charging current supplied from the charger 10 to the electronic device 20.

  If the switch unit 31 is in the normal state, the value of the charging current in the current monitor unit 32 of the electronic device 20 is 0A before the predetermined time, which is the first timing, has elapsed. However, if the switch unit 31 is in a conduction failure, the value of the charging current in the current monitor unit 32 is 4A, and the abnormality determination unit 35 determines that it is abnormal (see FIG. 3A). On the other hand, if the switch unit 31 is in a broken state, the charge current value in the current monitor unit 32 is 0 A even after a predetermined time, which is the second timing, and the abnormality determination unit 35 determines that it is abnormal. (See FIG. 3B).

  FIG. 4 is a flowchart showing an example of the operation according to the first embodiment of the present invention.

  In the initial setting state, the switch unit 31 is in a cutoff state (step S1). When the charger 10 is connected to the electronic device 20, the output request unit 33 of the electronic device 20 generates an output request command for requesting output of a charging current. The signal connection unit T of the electronic device 20 transmits the generated output request command to the output control unit 13 of the charger 10 via the charging cable K and the signal connection unit S on the charger 10 side (step S2). The generated output request command is also transmitted to the delay circuit 34 and the abnormality determination unit 35 at the same time. Then, the output request unit 33 counts time. Based on the received output request command, the output control unit 13 supplies the charging voltage and charging current from the power output unit 12 to the charging connection unit Q of the electronic device 20 via the charging connection unit P and the charging cable K.

  Since the charging start time of the secondary battery 40 is the first timing for monitoring the value of the charging current, the current monitoring unit 32 measures the charging current and determines whether or not the charging current value is 0A. Determine (step S3). When the value of the charging current is 0 A in the current monitor unit 32 (Yes in step S3), the abnormality determination unit 35 determines that the switch unit 31 is in the cutoff state and in the normal state. A predetermined time elapses (step S4). After the predetermined time has elapsed, the output request unit 33 transmits a progress command notifying that the predetermined time has elapsed to the delay circuit 34 and the abnormality determination unit 35. The delay circuit 34 that has received the elapsed command transmits an output request command for switching the cut-off state to the conductive state after a predetermined time has elapsed, and the switch unit 31 sets the electric circuit 36 to the conductive state (step S5). Since the abnormality determination unit 35 that has received the elapsed command is the second timing for monitoring the value of the charging current, the charging current flowing through the electric circuit 36 transmitted from the current monitoring unit 32 is in the “present” state (for example, 4A). Is detected (step S6). If the value of the charging current is 4 A, the abnormality determination unit 35 determines that the switch unit 31 is in a normal state and ends the process.

  Although 4A has been described as an example of the value of the charging current, the value is not particularly limited. For example, in supplementary charging at the initial stage of charging, the value of the charging current is a small current of about 0.1 A in order to protect the secondary battery 40. In the determination of step S6, it is sufficient that the value of the charging current is not 0A, and if the charging current is substantially flowing, the charging current “present” state can be determined. It is determined that the abnormal state is not maintained.

  On the other hand, when the value of the charging current is not 0A in Step S3 (No in Step S3) or when the value of the charging current is not 4A in Step S6 (No in Step S6), It is determined that there is an abnormality in the switch unit 31 (step S7). And the abnormality determination part 35 produces | generates the output stop command which orders the stop of a charging current, and transmits to the signal connection part T, and the signal connection part T is via the signal connection part S of the charging cable K and the charger 10. FIG. An output stop command is transmitted to the output control unit 13. The output control unit 13 that has received the output stop command stops the supply of the charging voltage and charging current to the electronic device 20 from the power output unit 12 (step S8).

  Based on the output request command generated by the output request unit 33 arranged in the electronic device 20, the electronic device 20 performs the start of charging of the charger 10 and the switching of the cut-off state or the conductive state of the switch unit 31. It becomes possible to control the safety of charging the secondary battery 40. Moreover, it becomes possible to charge the secondary battery 40 from the charger 10 side more safely. Then, by transmitting the abnormality determination result by the abnormality determination unit 35 in the electronic device 20 to the charger 10 side, charging from the charger 10 side can be stopped on the charger 10 side. It is possible to prevent the danger of overvoltage and overcurrent due to abnormalities.

  FIG. 5 is a block diagram showing an example of a second embodiment of an electronic device and an electronic device system according to the present invention.

  The difference between the first embodiment and the second embodiment is that the power output unit 12 and the output control unit 13 of the charger 10 described in the first embodiment are included in the terminal unit 30 in the second embodiment. Is provided. The output request unit 33 of the terminal unit 30 of the first embodiment is also integrated with the output control unit 13 in the second embodiment.

  An example table showing an abnormality determination state according to the second embodiment of the present invention is omitted because it is the same as that in FIG. 2, but will be described in detail below with reference to FIG.

<Normal state: FIG. 2 (a)>
Before the charger 10 is connected to the electronic device 20, the switch part 31 of the electronic device 20 is in a cut-off state (OFF) (see charging unconnected: see). When the charger 10 is connected to the electronic device 20, the charging of the secondary battery 40 is started, but the switch unit 31 maintains the cutoff state before a predetermined time counted by the output control unit 13, A charging current does not flow through the electric path 36. Therefore, the value of the charging current measured by the current monitoring unit 32 is 0 A (“no” state where no charging current flows) (first timing: reference). When a predetermined time elapses, the switch unit 31 enters a conductive state (ON) in which a charging current can flow through the electric circuit 36 by a signal from the delay circuit 34. Then, the current monitoring unit 32 detects the value (for example, 4 A) of the charging current (a state where the charging current is “present”) (second timing: see).

  When the switch part 31 is functioning normally, it is the above-mentioned normal state and the determination of the abnormality determination part 35 is "OK". Further, the current monitor unit 32 constantly monitors the presence or absence of a charging current that is a basis for the determination by the abnormality determination unit 35. Since the monitoring timing is before the predetermined time has elapsed and after the predetermined time has elapsed, the time before the predetermined time has elapsed will be described as the first timing, and the time after the predetermined time has elapsed will be described as the second timing.

<Abnormal state: FIG. 2 (b)>
At the first timing, when the switch unit 31 is broken and is in a conductive state, the current monitor unit 32 detects the value of the charging current (for example, 4A). In the “present” state in which the charging current is detected, the abnormality determination unit 35 determines that the switch unit 31 is in an abnormal state in which the electric circuit 36 cannot be interrupted, and determines the abnormality determination “NG”. Perform (first timing: see).

<Abnormal state: FIG. 2 (c)>
At the first timing, even if the switch unit 31 breaks down and is in the cut-off state, at the first timing, it is the same as the normal state, and the value of the charging current in the current monitor unit 32 is 0A “None”. It is measured, and the determination of the abnormality determination unit 35 is “OK”. However, at the second timing, the current monitoring unit 32 measures the charge current “none” with a charge current value of 0A. In the “no” state where the charging current is not flowing, the abnormality determination unit 35 determines that there is an abnormal state in which the switch unit 31 cannot realize the conduction of the electric path 36 and performs the abnormality determination “NG” ( Second timing: see).

  FIG. 6 is a signal chart showing an example of an abnormality determination state according to the second embodiment of the present invention, where (a) shows the first timing and (b) shows the second timing. The value of the charging current in the normal state is indicated by a solid line, and the value of the charging current in the abnormal state is indicated by a broken line. The upper row shows the value of the charging current (monitor current) monitored by the current monitor unit 32, and the lower row shows the value of the charging current from the power output unit 12.

  If the switch unit 31 is in a normal state, the value of the charging current in the current monitor unit 32 is 0 A before the elapse of a predetermined time which is the first timing. However, if the switch unit 31 is in a conductive state failure, the value of the charging current in the current monitor unit 32 is 4A, and the abnormality determination unit 35 determines that it is abnormal (see FIG. 6A). On the other hand, if the switch unit 31 is in a broken state, the charge current value in the current monitor unit 32 is 0 A even after a predetermined time, which is the second timing, and the abnormality determination unit 35 determines that it is abnormal. (See FIG. 6B).

  FIG. 7 is a flowchart showing an example of the operation according to the second embodiment of the present invention.

  In the initial setting state, the switch unit 31 is in a cutoff state (step S11). When the charger 10 is connected to the electronic device 20, the output control unit 13 generates an output request command for requesting output of a charging current. The generated output request command is also transmitted to the delay circuit 34 and the abnormality determination unit 35 at the same time. Then, the output control unit 13 counts time. Based on the received output request command, the power output unit 12 supplies a charging voltage and a charging current.

  Since the charging start time of the secondary battery 40 is the first timing for monitoring the value of the charging current, the current monitoring unit 32 measures the charging current and determines whether or not the charging current value is 0A. Determination is made (step S12). When the value of the charging current is 0A in the current monitor unit 32 (Yes in step S12), the abnormality determination unit 35 determines that the switch unit 31 is in the cut-off state and in the normal state. A predetermined time elapses (step S13). After the predetermined time has elapsed, the output control unit 13 transmits a progress command notifying that the predetermined time has elapsed to the delay circuit 34 and the abnormality determination unit 35. The delay circuit 34 that has received the elapsed command transmits an output request command for switching the cut-off state to the conductive state after a predetermined time has elapsed, and the switch unit 31 sets the electric circuit 36 to the conductive state (step S14). Since the abnormality determination unit 35 that has received the elapsed command is the second timing for monitoring the value of the charging current, the charging current flowing through the electric circuit 36 transmitted from the current monitoring unit 32 is in the “present” state (for example, 4A). Is detected (step S15). If the value of the charging current is 4A (step S15 is Yes), the abnormality determination unit 35 determines that the switch unit 31 is in a normal state and ends the process.

  Although 4A has been described as an example of the value of the charging current, the value is not particularly limited. For example, in supplementary charging at the initial stage of charging, the value of the charging current is a small current of about 0.1 A in order to protect the secondary battery 40. In the determination of step S15, it is sufficient that the value of the charging current is not 0A, and the charging current “present” state can be determined if even a small amount of charging current flows. It is determined that the abnormal state is not maintained.

  On the other hand, when the value of the charging current is not 0A in Step S12 (No in Step S12) or when the value of the charging current is not 4A in Step S15 (No in Step S15), the abnormality determining unit 35 It determines with the switch part 31 having abnormality (step S16). Then, the abnormality determination unit 35 generates an output stop command that instructs the stop of the charging current, and transmits the output stop command to the output control unit 13. The output control unit 13 that has received the output stop command stops the supply of the charging voltage and the charging current from the power output unit 12 (step S17).

  In the above-described embodiment, the current monitoring unit 32 constantly monitors the presence or absence of the charging current that is the basis of the determination by the abnormality determination unit 35. However, it is not always necessary to monitor the presence or absence of the charging current. For example, monitoring may be performed only for a predetermined time every predetermined cycle, and the predetermined cycle and the predetermined time may be changed.

  Processing in various configuration requirements can be performed not only by hardware configuration but also by software processing. In particular, the processing by the delay circuit 34 can be realized by software.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

  An electronic device and an electronic device system according to the present invention include a switch in an electronic device when charging a secondary battery such as a mobile phone such as a smartphone, a mobile terminal such as a tablet, a digital camera, a portable personal computer, or a wireless device. The present invention can be applied to an application that can easily find a failure of a part or the like.

10: Charger 11: Rectifier 12: Power output unit 13: Output control unit 20: Electronic device 30: Terminal unit 31: Switch unit 32: Current monitor unit 33: Output request unit 34: Delay circuit 35: Abnormality determination unit 36: Electric circuit 40: Secondary battery

Claims (6)

An electronic device including a secondary battery that can be charged by a charger,
An output requesting unit for generating an output request command for requesting the charger to output a charging current for the electronic device;
A signal connection unit for transmitting the output request command to the charger;
A charging connection unit to which the charging current is supplied from the charger that has received the output request command;
A switch unit capable of switching an electrical path through which a charging current from the charging connection unit flows from a cut-off state to a conductive state after a predetermined time has elapsed since generation of the output request command;
A current monitoring unit that monitors the presence or absence of the charging current flowing in the electric circuit at a first timing before the predetermined time elapses and a second timing after the predetermined time elapses after the generation of the output request command;
In accordance with the presence or absence of a charging current from the current monitoring unit, an abnormality determination unit that determines the presence or absence of an abnormality in the switch unit,
Electronic equipment comprising. The electronic device according to claim 1,
When the abnormality determination unit determines that the switch unit is abnormal, the abnormality determination unit generates an output stop command that orders the stop of the charging current, and the signal connection unit transmits the output stop command to the charger. . The electronic device according to claim 1 or 2,
An electronic apparatus further comprising a delay circuit that receives an output request command from the output request unit and transmits the output request command to the switch unit after the predetermined time has elapsed. The electronic device according to any one of claims 1 to 3,
When the current monitoring unit detects a charging current flowing in the electric circuit at the first timing, the abnormality determining unit determines that the switch unit is in an abnormal state in which the interruption of the electric circuit cannot be realized. Electronics. The electronic device according to any one of claims 1 to 3,
When the current monitoring unit does not detect a charging current flowing through the electric circuit at the second timing, the abnormality determining unit determines that the switch unit is in an abnormal state in which the electric circuit cannot be conducted. Electronics.   The electronic device system containing the electronic device of any one of Claim 1 to 5, and a charger.

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