JP2017055530A - Charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To identify, on the occurrence of an overvoltage on the output side of a conversion device, whether the cause thereof lies in the abnormality of an AC power supply or in the abnormality of a charger.SOLUTION: In the charger, when a voltage detected by a voltage sensor 34 indicates an overvoltage, an ECU 100 determines that an abnormality exists in an external power supply 200 if there is a history that the voltage detected by a voltage sensor 42 indicates an overvoltage, whereas determines that an abnormality exists in the charger if there is no such history as the above. This enables the charger to identify that the cause of the overvoltage on the output side of an AC/DC converter 31 lies on either the abnormality of the external power supply 200 or the abnormality of the charger.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a charging device that charges a power storage device with electric power supplied from an AC power supply.

  Japanese Patent Laying-Open No. 2014-17917 (Patent Document 1) discloses a charging device including a charger for charging a vehicle-mounted battery with electric power supplied from an AC power supply outside the vehicle, and a control device for controlling the charger. Is disclosed. The charger is an AC / DC conversion circuit (power factor correction booster circuit) that converts alternating current received from an alternating current power source into direct current, and an insulation type that converts the voltage output from the AC / DC conversion circuit and outputs it to the in-vehicle battery. And a DC / DC conversion circuit. The control device controls the AC / DC conversion circuit so that the output voltage of the AC / DC conversion circuit becomes the target voltage when the vehicle-mounted battery is charged with electric power supplied from an AC power supply outside the vehicle.

JP 2014-17917 A

  In a charging device including a conversion device (AC / DC conversion circuit) that converts alternating current into direct current, such as the charging device disclosed in Patent Document 1, the voltage on the output side of the conversion device may be an overvoltage. The overvoltage on the output side of the conversion device can occur, for example, when an abnormal AC voltage is input to the charging device due to an abnormality in the AC power supply or when the charging device fails.

  Since the abnormality of the AC power supply is often temporary, if there is an abnormality in the AC power supply, it can be resolved after the suspension of charging. In such a case, charging can be resumed by waiting for the resolution of the AC power supply abnormality. On the other hand, when the charging device is out of order, it is necessary to replace the charging device.

  In this way, when an overvoltage on the output side of the conversion device occurs, the action to be taken differs depending on the cause. Therefore, when an overvoltage on the output side of the conversion device occurs, it is desired to identify whether the cause is an abnormality in the AC power supply or an abnormality in the charging device. However, in the said patent document 1, such a subject and its solution are not examined.

  This invention was made in order to solve such a subject, and the object is, when the overvoltage by the side of the output of a converter occurs, whether the cause is abnormality in an alternating current power supply, or a charging device It is to identify what is abnormal.

  A charging device according to the present invention is a charging device that charges a power storage device with power supplied from an AC power supply, and includes a conversion device, a first voltage sensor, a second voltage sensor, and a control unit. The conversion device converts alternating current received from the alternating current power source into direct current and outputs the direct current. The first voltage sensor detects a voltage on the output side of the conversion device. The second voltage sensor detects a voltage on the input side of the conversion device. The control unit has a history that the voltage detected by the second voltage sensor exceeds the second threshold indicating overvoltage when the voltage detected by the first voltage sensor exceeds the first threshold indicating overvoltage. When it is determined that there is an abnormality in the AC power supply, it is determined that there is an abnormality in the charging device when there is no history.

  In this charging device, when an overvoltage on the output side of the conversion device occurs, it is determined whether there is an abnormality in the AC power supply or an abnormality in the charging device depending on the history of the overvoltage on the input side of the conversion device. . Therefore, according to this charging device, it is possible to specify whether the cause of the overvoltage on the output side of the conversion device is an abnormality of the AC power supply or an abnormality of the charging device.

It is a figure which shows the whole structure of a vehicle provided with the charging device by embodiment. It is a flowchart which shows the process sequence of ECU based on the detection result of a voltage sensor. It is a figure for demonstrating an example of a history flag. It is a flowchart which shows operation | movement of the overvoltage detection circuit based on the detection result of a voltage sensor. It is a flowchart which shows operation | movement of the overvoltage detection circuit based on the request | requirement from ECU. It is a flowchart which shows the process sequence of ECU for a cause identification in case the detection result of a voltage sensor shows an overvoltage.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

<Vehicle configuration>
FIG. 1 is a diagram schematically illustrating an overall configuration of a vehicle 1 including a charging device according to the present embodiment. The vehicle 1 includes a drive device 10, a battery (power storage device) 20, a system main relay 21, a charging relay 22, a charger 30, a connector 40, and an ECU (Electronic Control Unit) 100. The charger 30 includes an AC / DC converter 31, a DC / DC converter 32, a capacitor 33, voltage sensors 34 and 42, and a drive circuit 35. The drive circuit 35 has an overvoltage detection circuit 36.

  The driving device 10 generates vehicle driving force using electric power supplied from the battery 20. Drive device 10 includes a motor generator mechanically connected to the drive wheels, and a power control unit (such as an inverter) that controls the amount of power supplied to the motor generator. The output of the drive device 10 (the amount of power supplied to the motor generator) is controlled by a control signal from the ECU 100.

  The vehicle 1 travels with a driving force generated by a motor generator of the driving device 10. The vehicle 1 may be configured to travel using the power of an engine (not shown) in addition to the driving force generated by the driving device 10.

  The battery 20 is a rechargeable power storage device, for example, a secondary battery such as a nickel metal hydride battery, a lithium ion battery, or a lead storage battery.

  System main relay 21 is provided between drive device 10 and battery 20 and is opened and closed by a control signal from ECU 100.

  Vehicle 1 is configured to be able to perform “external charging” in which battery 20 is charged with electric power supplied from an AC power source (hereinafter also referred to as “external power source”) 200 outside the vehicle. The external power source 200 is, for example, a system power source. As a configuration for performing external charging, the vehicle 1 includes a charging relay 22, a charger 30, and a connector 40.

  The charging relay 22 is provided between the battery 20 and the charger 30 and is opened and closed by a control signal from the ECU 100.

  The connector 40 is configured to be connectable with a connector 210 connected to the external power source 200.

  The charger 30 has an input end connected to the connector 40, and an output end connected to the battery 20 via the charging relay 22. The input side end of the charger 30 and the connector 40 are connected by a positive line PL2 and a negative line NL2. The charger 30 converts alternating current input from the external power source 200 into direct current that can charge the battery 20 based on a control signal from the ECU 100, and outputs the direct current to the battery 20.

  Specifically, the charger 30 includes an AC / DC converter 31, a DC / DC converter 32, a capacitor 33, voltage sensors 34 and 42, and a drive circuit 35. AC / DC conversion unit 31 and DC / DC conversion unit 32 are connected by positive line PL1 and negative line NL1.

  The AC / DC conversion unit 31 converts (rectifies) the alternating current input from the external power supply 200 via the connector 40 to direct current based on the drive signal from the drive circuit 35, and outputs the direct current to the positive line PL1 and the negative line NL1. To do. Furthermore, the AC / DC converter 31 also operates as a power factor correction (PFC) circuit that improves the power factor by bringing the AC power input from the external power supply 200 closer to a sine wave.

  The DC / DC converter 32 converts the output voltage of the AC / DC converter 31 into the voltage of the battery 20 based on the drive signal from the drive circuit 35 and outputs the voltage to the battery 20. The DC / DC converter 32 is a so-called insulated DC / DC converter.

  Capacitor 33 has one end connected to positive electrode line PL1 and the other end connected to negative electrode line NL1, and smoothes the voltage between positive electrode line PL1 and negative electrode line NL1.

  The voltage sensor 34 detects a voltage between the positive electrode line PL1 and the negative electrode line NL1 (that is, a voltage on the output side of the AC / DC conversion unit 31), and the detection result is a drive circuit 35 (overvoltage detection circuit 36), and It outputs to ECU100.

  Voltage sensor 42 detects a voltage between positive line PL2 and negative line NL2 (that is, a voltage on the input side of AC / DC converter 31), and outputs the detection result to ECU 100. The voltage detected by the voltage sensor 42 is an AC voltage of the external power supply 200. A history that the voltage detected by the voltage sensor 42 indicates an overvoltage is stored in an internal memory (not shown) in the ECU 100. The history storing operation and how this history is utilized will be described in detail later.

  The drive circuit 35 includes a charging CPU (Central Processing Unit) (not shown). The drive circuit 35 outputs a drive signal to the AC / DC converter 31 and the DC / DC converter 32 based on a control signal from the ECU 100, thereby driving the AC / DC converter 31 and the DC / DC converter 32. To control.

  The overvoltage detection circuit 36 stops the AC / DC conversion unit 31 and the DC / DC conversion unit 32 when detecting that the voltage on the output side of the AC / DC conversion unit 31 indicates an overvoltage based on the detection result of the voltage sensor 34. To do. The overvoltage detection circuit 36 includes a latch circuit, and can store that an overvoltage has occurred by turning on the overvoltage latch when an overvoltage on the output side of the AC / DC converter 31 is detected. For example, the overvoltage detection circuit 36 includes a comparator. The operation of the overvoltage detection circuit 36 will be described in detail later.

  The ECU 100 includes a CPU (Central Processing Unit) (not shown) and a memory, and each device (the driving device 10, the system main relay 21, the system main) of the vehicle 1 based on information stored in the memory and information from each sensor. The relay 21 and the charger 30) are controlled.

<Operations related to identifying the cause of overvoltage>
In the charging apparatus having the above configuration, the voltage on the output side of the AC / DC conversion unit 31 may be an overvoltage. The overvoltage on the output side of the AC / DC conversion unit 31 is generated, for example, when an abnormal AC voltage is input to the charger 30 due to an abnormality of the external power supply 200 or when any component in the charging device fails. obtain.

  Since the abnormality of the external power supply 200 is often temporary, if there is an abnormality in the external power supply 200, the problem can be solved after a certain amount of time has elapsed after the suspension of charging. On the other hand, if any component in the charging device is out of order, it is necessary to replace the failed component.

  In this way, when an overvoltage on the output side of the AC / DC converter 31 occurs, the action to be taken differs depending on the cause. Therefore, when an overvoltage on the output side of the AC / DC converter 31 is generated, it is desired to specify whether the cause is an abnormality of the external power supply 200 or an abnormality of the charging device.

  Therefore, in the charging apparatus according to this embodiment, when the voltage detected by the voltage sensor 34 indicates an overvoltage and the ECU 100 has a history that the voltage detected by the voltage sensor 42 indicates an overvoltage, When it is determined that there is an abnormality in the external power supply 200 and there is no history, it is determined that there is an abnormality in the charging device. Thereby, according to this charging device, it is possible to specify whether the cause of the overvoltage on the output side of the AC / DC conversion unit 31 is an abnormality of the external power supply 200 or an abnormality of the charging device. Hereinafter, the operation related to the identification of the cause of the overvoltage will be specifically described.

  FIG. 2 is a flowchart showing a processing procedure of the ECU 100 based on the detection result of the voltage sensor 42. Each step of the flowchart is basically realized by software processing by the ECU 100, but may be realized by hardware processing using an electronic circuit. In step S100, ECU 100 determines whether or not the detection result of voltage sensor 42 exceeds first threshold value Vth1 indicating an overvoltage.

  If the detection result of voltage sensor 42 exceeds first threshold value Vth1 (YES in step S100), ECU 100 causes history (external power supply) that the detection result of voltage sensor 42 exceeds first threshold value Vth1 in step S110. (Abnormality history) is stored in an internal memory (not shown). For example, the ECU 100 manages the history of external power supply abnormality using the history flag.

  FIG. 3 is a diagram for explaining an example of the history flag. The horizontal axis of FIG. 3 shows time, the upper part of the vertical axis shows the transition of the voltage of the external power supply 200, and the lower part shows the transition of the history flag state. For example, the first threshold value Vth1 is set to a value larger than the amplitude of the AC voltage of the external power supply 200. When the AC voltage of the external power source 200 exceeds the first threshold value Vth1 at time t1 (when a temporary overvoltage is generated), the voltage sensor 42 detects the AC voltage, so the history flag switches from the off state to the on state. . For example, the ECU 100 can manage the history of external power supply abnormality by storing the state of the history flag in the internal memory. In many cases, the abnormality of the external power supply 200 is a temporary overvoltage as shown in FIG. 3. In such a case, the abnormality of the external power supply 200 is resolved in a short time.

  The history of external power supply abnormality is stored, for example, until the connector 210 is removed from the connector 40, and is erased when the connector 210 is removed from the connector 40. Note that the external power supply abnormality history erasing timing is not necessarily limited to such a configuration. For example, even if the connector 210 is not removed from the connector 40, the history may be deleted after a predetermined time has elapsed since the start of charging. The history of external power supply abnormality is used to identify the cause of overvoltage. Details will be described later.

  Referring to FIG. 2 again, when the detection result of voltage sensor 42 is equal to or smaller than first threshold value Vth1 (NO in step S100), ECU 100 repeats the processing from step S100.

  FIG. 4 is a flowchart showing the operation of the overvoltage detection circuit 36 based on the detection result of the voltage sensor 34. Each step of this flowchart is basically realized by hardware processing of the overvoltage detection circuit 36, but may be realized by software processing. In step S200, the overvoltage detection circuit 36 determines whether or not the detection result of the voltage sensor 34 exceeds the second threshold value Vth2.

  If the detection result of voltage sensor 34 exceeds second threshold value Vth2 (YES in step S200), capacitor 33 is in an overvoltage state, so overvoltage detection circuit 36 outputs an overvoltage signal to ECU 100 in step S210. To do. Thereafter, the overvoltage detection circuit 36 turns on an overvoltage latch indicating an overvoltage state on the output side of the AC / DC converter 31 in step S220. When the overvoltage latch is on, it indicates that the output side of the AC / DC converter 31 is in an overvoltage state. When the overvoltage latch is off, the output side of the AC / DC converter 31 is not overvoltage. Indicates. Thereafter, in order to cancel the overvoltage state of the capacitor 33, the overvoltage detection circuit 36 stops the charger 30 (the AC / DC conversion unit 31 and the DC / DC conversion unit 32) in step S230. And the process from step S200 is repeated.

  If the detection result of voltage sensor 34 is equal to or lower than second threshold value Vth2 (NO in step S200), capacitor 33 is not in an overvoltage state, and thus overvoltage detection circuit 36 stops outputting an overvoltage signal in step S240. The process from step S200 is repeated.

  FIG. 5 is a flowchart showing the operation of the overvoltage detection circuit 36 based on a request from the ECU 100. Each step of this flowchart is basically realized by hardware processing of the overvoltage detection circuit 36, but may be realized by software processing. In step S260, the overvoltage detection circuit 36 determines whether or not there is an overvoltage latch OFF request from the ECU 100. As will be described in detail later, when ECU 100 determines that the overvoltage state of capacitor 33 has been eliminated, it outputs an overvoltage latch OFF request to overvoltage detection circuit 36. If there is no request to turn off the overvoltage latch (NO in step S260), overvoltage detection circuit 36 repeats the processing from step S260.

  If there is a request to turn off the overvoltage latch (YES in step S260), overvoltage detection circuit 36 switches the overvoltage latch to the off state in step S270. Thereafter, in step S280, the overvoltage detection circuit 36 controls the drive circuit 35 to resume charging by the charger 30, and repeats the processing from step S260. When an overvoltage latch off request is made, the overvoltage latch is in an on state and the charger 30 is stopped (see steps S220 and S230 in FIG. 4). Therefore, in step S280, charging by the charger 30 is resumed. Even if it is determined by the ECU 100 that the overvoltage state of the capacitor 33 has been resolved and charging by the charger 30 is resumed, if the overvoltage detection circuit 36 determines that the capacitor 33 is in the overvoltage state, the overvoltage latch is again activated. Is turned on, and charging by the charger 30 is stopped.

  FIG. 6 is a flowchart showing a processing procedure of the ECU 100 for specifying the cause when the detection result of the voltage sensor 34 indicates an overvoltage. Each step of the flowchart is basically realized by software processing by the ECU 100, but may be realized by hardware processing using an electronic circuit. In step S300, the ECU 100 determines whether or not the overvoltage signal output from the overvoltage detection circuit 36 is continuously output for a time T1 (ms) or more. If it is determined that the overvoltage signal is not continuously output for more than time T1 (NO in step S300), ECU 100 determines in step S370 that there is no abnormality in either external power supply 200 or the charging device. The process from step S300 is repeated.

  If it is determined that the overvoltage signal is continuously output for time T1 or more (YES in step S300), ECU 100 counts up counter C1 indicating the number of times the overvoltage signal has continued for time T1 or more in step S310. The counter C1 is stored in an internal memory (not shown).

  Thereafter, ECU 100 determines in step S320 whether or not the value of counter C1 is equal to or greater than a predetermined number of times X1. This is because it is determined that the overvoltage is not a single occurrence and there is an abnormality in either the external power supply 200 or the charging device. Regardless of the abnormality of the external power source 200 and the charging device, an overvoltage may be detected in a single shot due to the influence of a surge current or the like. Therefore, at the stage where the value of the counter C1 is small, it cannot be said that either the external power source 200 or the charging device is abnormal. Therefore, ECU 100 determines that there is an abnormality in either external power supply 200 or the charging device by performing the determination in step S320. The counter C1 is reset every predetermined time (for example, 10 seconds).

  If it is determined that the value of counter C1 is less than the predetermined number of times X1 (NO in step S320), the detected overvoltage may be one-off, so ECU 100 determines that the voltage in step S330 It is determined whether or not the detection result of the sensor 34 is equal to or less than the second threshold value Vth2. This is to determine whether or not it is necessary to make an overvoltage latch OFF request. When the overvoltage signal is output, the charger 30 is stopped (see step S230 in FIG. 3). When the overvoltage is a single occurrence, the overvoltage is eliminated by discharging the electric power stored in the capacitor 33 by a discharge resistor (not shown). When the overvoltage is eliminated, it is necessary to switch the overvoltage latch to the off state in order to resume charging. Therefore, ECU 100 makes a determination in step S330 to determine whether or not it is necessary to make an overvoltage latch OFF request.

  If it is determined that the detection result of voltage sensor 34 is equal to or lower than second threshold value Vth2 (YES in step S330), ECU 100 issues an overvoltage latch OFF request in step S340 because overvoltage is eliminated. Output to the detection circuit 36.

  Thereafter, in step S350, ECU 100 determines whether or not the overvoltage signal is continuously output for time T2 (ms) or more. This is for determining whether or not the cause of the overvoltage is a failure of the overvoltage detection circuit 36. In step S330, since the detection result of the voltage sensor 34 is determined to be equal to or less than the second threshold value Vth2, unless the overvoltage detection circuit 36 is abnormal, the overvoltage signal is continuously output for the time T2 or more. Absent. That is, when the overvoltage signal is continuously output for the time T2 or more, there is a high possibility that the overvoltage detection circuit 36 has failed. Therefore, ECU 100 determines whether or not the cause of the overvoltage is a failure of overvoltage detection circuit 36 by performing the determination in step S350.

  If it is determined that the overvoltage signal is continuously output for time T2 or more (YES in step S350), ECU 100 determines in step S360 that overvoltage detection circuit 36 has failed, and ends the process. To do. If it is determined that the overvoltage signal is not continuously output for more than time T2 (NO in step S350), ECU 100 determines in step S370 that there is no abnormality in either external power supply 200 or the charging device. The process from step S300 is repeated.

  If it is determined in step S330 that the detection result of voltage sensor 34 exceeds second threshold value Vth2 (NO in step S330), since overvoltage has not been eliminated, ECU 100 causes overvoltage in step S380. It is determined whether or not the signal is continuously output for a time T3 (s) or more. For example, time T3 (s) is about 30 to 40 seconds. This is for determining that either the external power supply 200 or the voltage sensor 34 is abnormal. As described above, when there is no abnormality in the external power source 200 and the voltage sensor 34, the electric power stored in the capacitor 33 is discharged by a discharge resistor (not shown). Therefore, the detected value of the voltage sensor 34 is equal to or less than the second threshold value Vth2 in a time less than the time T3 (s), and the overvoltage signal should be stopped (see steps S200 and S240 in FIG. 3). That is, when the overvoltage signal is continuously output for the time T3 or more, it is highly possible that either the external power supply 200 or the voltage sensor 34 has failed. Therefore, ECU 100 determines that there is an abnormality in either external power supply 200 or voltage sensor 34 by performing the determination in step S380.

  If it is determined that the overvoltage signal is continuously output for time T3 (s) or longer (YES in step S380), there is a possibility that either external power supply 200 or voltage sensor 34 has an abnormality. In step S385, it is determined whether or not a history of abnormality of the external power supply (history that the detection result of the voltage sensor 42 exceeds the first threshold value Vth1) is stored in an internal memory (not shown).

  If it is determined that an external power supply abnormality history is stored (YES in step S385), there is a high possibility that there is an abnormality in external power supply 200. Therefore, in step S410, ECU 100 has an abnormality in external power supply 200. Judge that there is. The abnormality of the external power supply 200 is often temporary and can be resolved after a certain amount of time has passed. Therefore, for example, charging by the charger 30 can be resumed when the external power supply 200 is restored and the overvoltage state is resolved. Therefore, after determining that there is an abnormality in external power supply 200, ECU 100 repeats the processing from step S300. ECU 100 makes an overvoltage latch-off request when resuming the processing from step S300.

  If it is determined that the external power supply abnormality history is not stored (NO in step S385), voltage sensor 34 fails (for example, a failure in which the detected value sticks to the high voltage side regardless of the actual voltage) In step S390, the ECU 100 determines that the voltage sensor 34 has failed and ends the process.

  If it is determined in step S380 that the overvoltage signal has not been continuously output for time T3 (s) or longer (NO in step S380), it is assumed that there is an abnormality in either external power supply 200 or voltage sensor 34. Since it cannot be said completely, ECU100 repeats the process from step S320 until time T3 passes. If the detection value of the voltage sensor 34 becomes equal to or lower than the second threshold value Vth2 before the time T3 has elapsed, the process returns to YES in step S330.

  If it is determined in step S320 that the value of counter C1 is equal to or greater than the predetermined number of times X1 (YES in step S320), there is a high possibility that either external power supply 200 or the charging device has an abnormality. In step S400, it is determined whether or not an external power supply abnormality history is stored in an internal memory (not shown). This is to determine which of the external power source 200 and the charging device is abnormal, as in step S385.

  If it is determined that an external power supply abnormality history is stored (YES in step S400), there is a high possibility that there is an abnormality in external power supply 200. Therefore, in step S410, ECU 100 has an abnormality in external power supply 200. It is determined that there is, and the processing from step S300 is repeated. This is because, as described above, when the cause of the overvoltage is an abnormality in the external power supply 200, the abnormality is often temporary, and the cause of the overvoltage can be resolved after a certain amount of time has elapsed. .

  If it is determined that the external power supply abnormality history is not stored (NO in step S400), there is a high possibility that the charging device has failed. Therefore, ECU 100 determines which of the charging devices is included in step S420. It is determined that such a part is out of order, and the process ends.

  As described above, when the voltage detected by the voltage sensor 34 indicates an overvoltage and the ECU 100 according to the present embodiment has a history that the voltage detected by the voltage sensor 42 indicates an overvoltage (step). If YES in step S385, YES in step S400), it is determined that there is an abnormality in external power supply 200 (step S410). If there is no history (NO in step S385, NO in step S400), there is an abnormality in the charging device. (Step S390, step S420). Thereby, according to this charging device, it is possible to specify whether the cause of the overvoltage on the output side of the AC / DC conversion unit 31 is an abnormality of the external power supply 200 or an abnormality of the charging device.

  The external power source 200 is an example of the “AC power source” of the present invention, and the battery 20 is an example of the “power storage device” of the present invention. The AC / DC converter 31, the voltage sensor 34, 42 and ECU 100 is an embodiment of the “charging device” of the present invention. The AC / DC converter 31 is an example of the “conversion device” of the present invention, the voltage sensor 34 is an example of the “first voltage sensor” of the present invention, and the voltage sensor 42 is the present invention. ECU 100 is an example of the “control unit” of the present invention.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1 vehicle, 10 drive device, 20 battery, 21 system main relay, 22 charge relay, 30 charger, 31 AC / DC conversion unit, 32 DC / DC conversion unit, 33 capacitor, 34, 42 voltage sensor, 35 drive circuit, 36 Overvoltage detection circuit, 40, 210 Connector, 100 ECU, 200 External power supply.

Claims (1)

A charging device that charges a power storage device with power supplied from an AC power source,
A converter for converting the alternating current received from the alternating current power source into a direct current and outputting the direct current;
A first voltage sensor for detecting a voltage on an output side of the converter;
A second voltage sensor for detecting a voltage on the input side of the converter;
When there is a history that the voltage detected by the second voltage sensor exceeds the second threshold value indicating overvoltage when the voltage detected by the first voltage sensor exceeds the first threshold value indicating overvoltage. A charging device comprising: a control unit that determines that the AC power supply is abnormal and determines that the charging device is abnormal when there is no history.

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