KR20180099286A - Apparatus and method for charging and discharging electric vehcile under smart grid environment - Google Patents

Abstract

A method for diagnosing a fault of a charger for a vehicle includes the steps of: comparing an output voltage of the charger with a voltage of a battery before starting a charging operation of the battery mounted in the vehicle; starting the charging operation or forcedly driving the charger according to a voltage comparison result; comparing a charging current of the battery with an output current of the charger if the charger is forcedly driven; and determining a fault part according to a current comparison result and finishing the charging operation. Accordingly, the present invention can more specifically and accurately identify the fault part and a fault region.

Description

TECHNICAL FIELD The present invention relates to a bidirectional charging / discharging method and apparatus for an electric vehicle for a smart grid,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidirectional charging and discharging method and apparatus for an electric vehicle for a smart grid, and more particularly, to a method and apparatus for more efficiently managing electric power transfer between a smart grid and an electric vehicle.

Hybrid vehicles and electric vehicles are known to people as eco-friendly cars. Typically, a hybrid vehicle may be defined as a vehicle having two or more power sources, such as an engine and a motor, and an electric vehicle may be defined as a vehicle using a pure battery. The hybrid vehicle can turn the generator during the running of the vehicle to self-charge the battery and turn it into driving energy. In particular, a hybrid vehicle uses a regenerative braking brake system to convert the kinetic energy of an electric motor, which rotates reversely when the vehicle decelerates, into electric energy, stores it in a battery, and uses energy stored during driving to improve energy efficiency.

On the other hand, electric vehicles are designed to be used after being charged like electronic products. However, using an electric vehicle can be very difficult if there is no infrastructure to charge the vehicle. To overcome this, a plug-in hybrid electric vehicle (PHEV) has been proposed. The plug-in hybrid vehicle (PHEV) is an energy-efficient vehicle that is halfway between a hybrid vehicle and an electric vehicle. The plug-in hybrid vehicle differs from a hybrid vehicle in that the driver plugs in the car like an electric car.

Plug-in hybrid vehicles and electric vehicles require an infrastructure to charge the vehicle. One method of charging the vehicle is to charge the vehicle using a power line supplied by the user or the driver to the home or the home. Since most users or drivers do not drive the vehicle during at least a portion of the day (e.g., at home), this time can be used to charge the vehicle.

When the electric vehicle is charged in the home (or the assembly building), the battery in the electric vehicle can be charged through the slow charger using the power line provided to the home (or the assembly building).

KR 10-1673822 B1

The present invention diagnoses the operation of a connection unit including an onboard charger (OBC) and a cable connecting the battery and the charger and a fuse before charging the battery mounted in the vehicle, and when the charging is not normally performed, It is possible to provide an apparatus and a method that can more clearly determine which region or region has a failure.

In addition, the present invention clarifies which area of a charger (On Board Charger, OBC) and connection means (cable, fuse) mounted on a vehicle has occurred, thereby making it easy for a user or a driver to repair and manage the vehicle The present invention can provide a device and a method that can be used.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

The method for diagnosing faults in a car charger according to an embodiment of the present invention includes comparing a voltage of a battery and an output voltage of a charger before a charging operation of a battery mounted in a vehicle is started; Initiating the charging operation or forcibly driving the charger according to a voltage comparison result; Comparing the output current of the charger with the charging current of the battery when the charger is forcibly driven; And determining a failure site according to a result of the current comparison and terminating the charging operation.

The method further includes a step of connecting the pre-charge relay unit when the charging sequence is entered before performing the step of comparing the voltage of the battery with the output voltage of the charger. And connecting the main relay unit and disconnecting the precharge relay unit.

If the difference between the voltage of the battery and the output voltage of the charger is smaller than a preset range, the charging operation can be started.

If the difference is greater than or equal to the above range, the charger can be forcibly driven.

Further, the forcible drive may be performed to determine a failure in the vehicle power charging apparatus including the charger, the battery, and at least one connecting circuit connecting the battery and the battery, and a stabilizing circuit.

If the output current of the charger and the charging current of the battery are the same, the output voltage sensor of the charger can be determined as faulty.

Further, if the output current of the charger differs from the charging current of the battery, it can be determined that at least one of the high voltage cable and the fuse is broken.

The vehicle charger failure diagnosis method may further include the step of outputting, through a display device, one of a message, notification, and warning indicating the failure location.

The vehicle charger failure diagnosis method may further include transmitting at least one of a message, notification, and warning indicating the failure location through a wired / wireless communication network.

Also, the charging operation may be performed using AC power through the slow charging charger.

The computer readable recording medium according to another embodiment of the present invention may be recorded with an application program which is executed by a processor and includes a method for diagnosing a malfunction of a charger for a vehicle.

According to another aspect of the present invention, there is provided a vehicular electric power charging apparatus including: a battery device mounted on a vehicle for storing electrical energy; A charger for receiving AC power and outputting DC power for charging the battery device; And a charge controller for comparing the voltage of the battery device with the output voltage of the charger to determine forced drive of the charger.

Further, the charger includes a converter circuit for converting the AC power into the DC power; A rectifying circuit for rectifying an output of the converting circuit; And an output control unit for controlling an output of the rectifying circuit.

In addition, the charger may further include a correction circuit for a power factor correction (PFC) for reducing power loss of the AC power.

The battery device may further include a rechargeable battery for storing the electric energy; Two main relays which are the power contacts (+, -) of the rechargeable battery; A precharge relay relaying a relay of one of the two main relays; And a precharge resistance connected to the precharge relay.

Also, the voltage of the battery device may be applied between the two main relays after the two main relays are connected.

Further, the vehicle power charging apparatus may further include a connection unit connecting the battery device and the charger, and the connection unit may include a fuse for preventing an overcurrent from flowing.

The charging controller starts the charging operation if the difference between the voltage of the battery and the output voltage of the charging device is less than a predetermined range in the voltage comparison result. If the difference is greater than or equal to the predetermined range, Can be driven.

When the charger is forcibly driven, the charge controller compares the output current of the charger with the charge current of the battery, determines a failure site according to a result of the current comparison, and terminates the charge operation.

If the output current of the charger is equal to the charging current of the battery, the output voltage sensor of the charger is determined to be faulty. If the output current of the charger is different from the charging current of the battery, Can be judged as a failure.

Further, the vehicle power charging device may further include a display device for outputting in the form of one of a message, notification, and warning indicating the failure site.

The vehicle power charging device may further include a communication device that transmits at least one of a message, notification, and warning indicating the failure area through a wired / wireless communication network.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, And can be understood and understood.

The effect of the device according to the present invention will be described as follows.

The present invention can identify more specific and definite faulty areas and areas in fault diagnosis of a wide area and area in judging whether the device for charging a vehicle is faulty.

In addition, the present invention can diagnose the fault region and the area more clearly, and there is no need for the user or the driver to perform unnecessary maintenance (labor cost, component replacement cost), and there is an economic advantage in maintenance and management of the electric vehicle .

The effects obtainable by the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. It is to be understood, however, that the technical features of the present invention are not limited to the specific drawings, and the features disclosed in the drawings may be combined with each other to constitute a new embodiment.
1 illustrates a first example of a charger failure diagnosis method.
2 illustrates a power charging apparatus for a vehicle.
3 illustrates a second example of a charger failure diagnosis method.
Fig. 4 illustrates a case in which the charging device is malfunctioning.
5 illustrates a case where a cable and a fuse are broken down.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an apparatus and various methods to which embodiments of the present invention are applied will be described in detail with reference to the drawings. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role.

In the description of the embodiments, when it is described as being formed on the "upper" or "lower" of each element, the upper or lower (lower) And that at least one further component is formed and arranged between the two components. Also, the expression "upward" or "downward" may include not only an upward direction but also a downward direction on the basis of one component.

ISO / IEC 15118 and IEC 61851-1 are international standards for charging infrastructures. This standard is intended to improve basic compatibility in communication procedures and signal processing for efficient charging between electric vehicles and charge spots.

For example, a communication protocol used in a combo (Combined Charging System, Combo) method, which can charge a charging standard for an electric vehicle (EV) using a single connector for normal charging and rapid charging, is international standardized through ISO / IEC 15118 . Specifically, the requirements of the physical layer and the data link layer of ISO / IEC 15118 are defined in ISO / IEC 15118-3, and IEEE 1901 Profile Green PHY and IEEE 802.3 MAC are used. The IEEE 1901 Profile Green PHY is an IEEE 1901 profile criterion and the HomePlug Powerline Alliance has determined it as HomePlug Green PHY (HPGP) based on Power Line Communication (PLC) technology. HPGP technology is a broadband powerline communication technology using the 1.8-28MHz band, and the communication speed can be about 10Mbps.

In addition, IEC 61851-1 (Electric Vehicle Conductive Charging System - Part 1: General Requirements), which is the standard of the charging system, covers general matters such as the rated voltage and current of the charging system, charging connection method, charging mode, charging interface, IEC 61851-21-1 (EMC Requirements for Conductive Connection to AC / DC Supply) and IEC 61851-21-2 (EMC Requirements for AC Charger Electro- Off Board Electric Vehicle Chargng Systems). In addition, IEC 61851-23 (D.C. Electric Vehicle Charging Station) is developing a standard for an off-board charging system.

1 illustrates a first example of a charger failure diagnosis method.

As shown in the figure, the charger failure diagnosis method includes a step (12) of entering a charging sequence, a step (14) of connecting a main relay, a step of comparing whether a difference between a battery voltage and a charger output voltage is smaller than a predetermined threshold value 16). That is, when the main relay connected to the charging sequence is connected, the high-voltage battery connection and the fast charging charger voltage are measured to check the high-voltage battery connection state.

If the difference between the high-voltage battery voltage and the constant-speed charger output voltage is determined to be within the predetermined threshold value, the high-voltage battery is normally connected, and the slow charger performs charging (18). When the charging is completed, the charging can be terminated (22).

If the difference between the high-voltage battery voltage and the slow-charger output voltage is greater than a predetermined threshold value, then the charging is terminated (22). The connection of the high-voltage battery and the slow charger can be expressed by diagnostic information including the meaning of a failure in the high-voltage cable and the fuse. However, even when a problem occurs in the output voltage sensor of the slow charger, the same diagnostic information can be displayed. That is, it may be difficult to clarify whether there is a problem with the connection means inside the vehicle or a problem with the fast charger.

2 illustrates a power charging apparatus for a vehicle.

As shown, the vehicle power charging device 60 may be connected to the charging infrastructure 76 to transmit and receive power signals and control signals 74 for charging. The charging infrastructure 76 may be wired or wirelessly connected to the charging device 60 and the charging infrastructure 76 may be connected to a charging station, a public charger, a charger of a building, a home, office, etc. And the like.

On the other hand, the vehicle power charging device 60 includes a battery device 70 mounted on the vehicle for storing electric energy, a charger 62 for receiving AC power and outputting DC power for charging the battery device 70, And a charge controller 64 for comparing the voltage of the battery device 70 with the output voltage of the charger 62 to determine forced drive of the charger 62. [

The charger 62 in the vehicle power charging apparatus 60 includes a converter circuit 94 for converting AC power into DC power, a rectifier circuit 96 for rectifying the output of the converter circuit 94, And an output control unit 98 for controlling the display unit. In addition, the charger may further include a correction circuit 92 for power factor correction (PFC) for reducing the power loss of the AC power. Here, the charger 62 may be an onboard charger (OBC) that can be mounted on a vehicle. However, according to the embodiment, the charger 62 may not be mounted inside the vehicle but may be implemented in a form that can be selectively connected.

The battery device 70 included in the vehicle can be designed to store and output a high voltage. When the battery device 70 outputs a high voltage or stores a high voltage, there is a risk of explosion due to heat, which may threaten the safety of the vehicle. Therefore, the battery device 70 mounted on the vehicle includes a rechargeable battery 88 for storing electrical energy, two main relays (Main Relay 82A, 82B) which are the power contacts (+, -) of the rechargeable battery; A precharge relay 84 for bypassing one of the two main relays 82A and 82B and a precharge resistance 86 connected to the precharge relay 84 .

Further, the vehicle power charging device may further include a connecting portion 72 connecting the battery device 70 and the charger 62. The connection portion 72 may include not only a cable for transmitting a high voltage but also a fuse 71 for preventing an overcurrent from flowing. The degree of deterioration of the cable disposed in the vehicle depends on the driving environment of the vehicle, and even if a failure occurs in connection or jointing, the cable can be easily identified by eyes. A fuse 71 is disposed between the battery device 70 and the charger 62 in order to prevent a danger of ignition due to high risk because the cable of the connection part 72 transmits a high voltage, It is possible to prevent the risk by automatically disconnecting the electrical connection when the overcurrent is transmitted.

The vehicle power charging apparatus 60 may further include a battery management unit 68 for monitoring the state of the remaining charge of the battery device 70, the temperature, and the like, and reporting information on the state. The battery management section 68 can confirm and report the state of the battery device 70 when the in-vehicle battery device 70 is charged, when the vehicle is running, and so on, so that the driver or the user can charge the electric vehicle Status, distance travelable, and the presence of electrical system problems.

The battery charger 62, the battery device 70, the battery management unit 68 and the like may be controlled by the charging control unit 64 or may be interlocked with the charging control unit 64. The charge control unit 64 can compare the voltage of the battery device 70 with the output voltage of the charger 62 for the purpose of fault diagnosis. Here, the voltage of the battery device 70 may mean that the voltage is applied between the two main relays 82A and 82B after the two main relays 82A and 82B are connected. The battery device 70 may be connected to the precharge relay 84 and the precharge resistor 86 because the sudden input of a high voltage or a high current in the process of charging the battery device 70 may cause problems of the battery device 70. [ It is possible to check and check the state of the battery device 70 before the charging operation is initially performed in the predetermined charging procedure. Thereafter, if it is determined that there is no problem in the battery device 70, the main relay can be connected and the charging operation can be performed. It may be accurate to check whether the main relay of the battery device 70 is connected to determine whether the charger 62,

The charge controller 64 in the vehicle electric power charging apparatus 60 calculates the difference between the voltage of the battery device 70 and the output voltage of the charger 62 in the comparison result of the voltage of the battery device 70 and the output voltage of the charger 62 It is determined that there is no problem in the connection portion 72 or the charger 62 to charge the vehicle and the charging operation can be started.

If the difference between the voltage of the battery device 70 and the output voltage of the charger 62 is greater than or equal to the range in the comparison result, it can be determined that there is a failure in the connection part 72 or the charger 62. Even if it is determined that there is a failure in the connection portion 72 or the charging device 62, the charging operation is not immediately terminated, and the charging controller 64 controls the charging device 62 to more clearly indicate the failure, the failure region, It can be forcibly driven.

The charging controller 64 can compare the output current of the charger 62 with the charging current of the battery device 70 when the charger 62 is forcibly driven. Based on the result of the current comparison, the charge controller 64 may determine the fault location and terminate the charge operation.

For example, when the output current of the charger 62 is equal to the charging current of the battery device 70, the charge controller 64 determines that the output controller 98 (e.g., output voltage sensor) of the charger 62 is malfunctioning It can be judged. On the other hand, if the output current of the charger 62 differs from the charging current of the battery device 70, it can be determined that at least one of the high voltage cable and the fuse of the connection portion 72 is broken.

On the other hand, the vehicle power charging apparatus 60 may further include a display unit 66 for outputting in the form of one of a message, notification, and warning indicating a failure region determined by the charge controller 64. [ Here, the display unit 66 may be implemented as a display device, a touch screen, a lamp, or the like, and may output different types of malfunctions in various cases occurring during the charging process. For example, the output of the display unit 66 may include a message that can be classified into colors, characters, graphics, and the like.

The vehicle electric power charging apparatus 60 may further include a communication unit 80 for transmitting at least one of a message, notification, and warning indicating a failure site through a wired / wireless communication network. The communication unit 80 can work with a user or a terminal held by a driver through a wired / wireless communication network such as the Internet, a local area wireless communication network, or the like. The communication unit 80 can transmit a series of information related to the charging process of the vehicle to the user or the driver, and can also be connected to a vehicle management server (e.g., telematics server) .

When the main relay is connected according to the entry of the charging procedure, the vehicle power charging device 60 determines that the high-voltage battery is normally connected when the difference between the high-voltage battery voltage and the charger output voltage is within a predetermined threshold value. . However, when the difference between the high-voltage battery voltage and the charger output voltage exceeds a predetermined threshold value, it is recognized that there is a failure at the output terminal of the charger, and an operation for clarifying the failure site can be performed. For example, it enters the forced drive mode of the charger. At this time, the charger performs output current control. If the output current control command value and the actual battery charge current are the same after entering the charger forced drive mode, the high voltage cable and the fuse outside the charger output are normal and the charge can be terminated after it is determined that the output voltage sensor inside the slow charger has failed. have. If the output current control command value and the actual battery charge current are not the same after entering the charger forcible drive mode, charging can be terminated after the high voltage cable and fuse failure outside the slow charger are determined. It is possible to clarify which area of the vehicle electric power charging apparatus 60 is faulty.

3 illustrates a second example of a charger failure diagnosis method.

As shown in the figure, the vehicle charger failure diagnosis method includes comparing (36) a battery voltage to an output voltage of a charger before starting a charging operation of a battery mounted on the vehicle, A step (40) of forcibly driving the charger, a step (42) for comparing the output current of the charger with the charging current of the battery when the charger is forcibly driven, and a step (42) 44) terminating the charging operation (46).

Before performing the step 36 of comparing the voltage of the battery with the output voltage of the charger, the car charger failure diagnosis method may further comprise the step of entering the charging sequence 32 and the step of connecting the main relay 34 have. More specifically, after entering the charging sequence (32), the pre-charge relay unit in the battery device is connected, and if it is determined that there is no problem in the battery device, the main relay unit can be connected and the precharge relay unit can be disconnected . The battery voltage for comparing the voltage uses the voltage applied to the battery device after connecting the main relay part.

The charging operation can be started when the difference between the voltage of the battery and the output voltage of the charger is smaller than the preset range in the voltage comparison result. For example, the charging operation can be accomplished using AC power through the slow charger. The charger can receive AC power and convert it to DC power to charge the battery installed in the vehicle.

However, if the difference is greater than or equal to the range, the charger can be forced to operate. Here, forcible driving can be performed to determine whether or not a failure occurs in the vehicle power charging apparatus including the charger, the battery, and at least one connecting circuit connecting the battery and the charger and the stabilizing circuit.

After step 40 of forcing the charger, the output current of the charger and the battery charging current may be compared (42). If the output current of the charger and the charge current of the battery are the same in the current comparison result, the output voltage sensor of the charger can be judged to be faulty (44). On the other hand, if the output current of the charger differs from the charging current of the battery, it can be determined that at least one of the high voltage cable and the fuse has failed (44). Charging can be terminated after diagnosing the fault area or area through forced operation of the charger (46).

Meanwhile, although not shown, the vehicle charger failure diagnosis method may further include a step of outputting through a display device in the form of a message, a warning, or a warning indicating a failure site. Convenience may be enhanced if not only the result of charging through the display device but also the diagnosis result of the fault area after the charging is completed is informed to the driver or the user.

In addition, the vehicle charger failure diagnosis method may further include transmitting at least one of a message, notification, and warning indicating a failure site through a wired / wireless communication network. For example, when charging a vehicle in a building or home, it may take 3 to 5 hours or more for a full charge. Accordingly, when charging the vehicle, the driver or the user may not be located next to the vehicle, and may transmit the charge-related information to the driver or the terminal carried by the user through the wired / wireless communication network or the local area network.

Fig. 4 illustrates a case in which the charging device is malfunctioning.

As shown in the figure, the difference between the value obtained by sensing the output voltage of the charger (OBC) and the high voltage battery voltage after the main relay of the battery device is connected can be confirmed. For example, the voltage of the high voltage battery may be 360V and the output voltage of the charger may be 10V. In this case, the difference between the value obtained by sensing the output voltage of the charger and the high-voltage battery voltage can be determined to be equal to or greater than a preset threshold value, and the charger can be forcibly driven.

After the charger is forcibly driven, the output current of the charger is compared with the charging current of the high-voltage battery, so that the failure site can be clarified. As shown in the figure, if the charger output current is 10A and the charging current of the high-voltage battery is 10A, it can be confirmed that the output current command value of the charger matches the high-voltage battery charging current. In this case, charging can be terminated after confirming that the charger internal output voltage sensor is faulty.

5 illustrates a case where a cable and a fuse are broken down.

As shown in the figure, the difference between the value obtained by sensing the output voltage of the charger (OBC) and the high voltage battery voltage after the main relay of the battery device is connected can be confirmed. For example, if the voltage of the high-voltage battery is 360V and the output voltage of the charger is 400V, the difference between the value obtained by sensing the output voltage of the charger and the high-voltage battery voltage can be determined to be equal to or greater than a preset threshold, .

When the charging current of the charger is compared with the charging current of the high voltage battery after the charger is forcibly driven, the output current of the charger may be 10A and the charging current of the high voltage battery may be 0A. If the output current command value of the charger does not match the high-voltage battery charging current, charging may be terminated after determining that the external high-voltage cable and fuse between the charger and the battery has failed.

The method according to the above-described embodiments may be implemented as a program to be executed by a computer and stored in a computer-readable recording medium. Examples of the computer-readable recording medium include a ROM, a RAM, a CD- , A floppy disk, an optical data storage device, and the like, and may also be implemented in the form of a carrier wave (for example, transmission over the Internet).

The computer readable recording medium may be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner. And, functional program, code, and code segments for implementing the above-described method can be easily inferred by programmers in the technical field to which the embodiment belongs.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

Accordingly, the above description should not be construed in a limiting sense in all respects and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

70: Battery 68: Battery management section
60: Electric vehicle 72: Connection
64: Charging control unit 62: Charger
66: Display section 80:

Claims (22)

Comparing the voltage of the battery and the output voltage of the charger before starting charging operation of the battery mounted in the vehicle;
Initiating the charging operation or forcibly driving the charger according to a voltage comparison result;
Comparing the output current of the charger with the charging current of the battery when the charger is forcibly driven; And
Determining a failure site according to a result of the current comparison and terminating the charging operation
And a battery charger failure diagnosis method. The method according to claim 1,
Before performing the step of comparing the voltage of the battery with the output voltage of the charger,
Connecting the pre-charge relay unit upon entering the charging sequence; And
Connecting the main relay unit and disconnecting the precharge relay unit
Further comprising the steps of: The method according to claim 1,
And the charging operation is started when the difference between the voltage of the battery and the output voltage of the charging device is less than a predetermined range in the voltage comparison result. The method of claim 3,
And if the difference is greater than or equal to the range, forcibly drives the charger. 5. The method of claim 4,
Wherein the forcible drive is performed to determine whether a malfunction has occurred in the vehicle power charging device including the charger, the battery, and at least one connecting circuit connecting the battery and the battery, and a stabilizing circuit. The method according to claim 1,
Wherein the output voltage sensor of the charger determines that the output voltage sensor of the charger is out of order if the output current of the charger is the same as the charging current of the battery. The method according to claim 1,
And determines that at least one of the high voltage cable and the fuse is broken if the output current of the charger is different from the charging current of the battery. The method according to claim 1,
A step of outputting through a display device in the form of a message indicating a faulty part,
Further comprising the steps of: The method according to claim 1,
Transmitting at least one of a message, a notification, and a warning indicating the failure site through a wired / wireless communication network
Further comprising the steps of: The method according to claim 1,
Wherein the charging operation is performed using alternating current power through a slow charging charger. A computer readable recording medium on which an application program is recorded, characterized by comprising the method for diagnosing a charger for a vehicle according to any one of claims 1 to 10 through being executed by a processor. A battery device mounted on the vehicle for storing electrical energy;
A charger for receiving AC power and outputting DC power for charging the battery device; And
A charging controller for comparing the voltage of the battery device with the output voltage of the charger to determine forced driving of the charger;
Wherein the vehicle power charging device comprises: 13. The method of claim 12,
The charger
A converter circuit for converting the AC power into the DC power;
A rectifying circuit for rectifying an output of the converting circuit;
An output control section for controlling the output of the rectifying circuit;
Wherein the vehicle power charging device comprises: 14. The method of claim 13,
The charger
A correction circuit for power factor correction (PFC) for reducing the power loss of the AC power;
Further comprising: a vehicle power regulator for regenerating the vehicle power. 13. The method of claim 12,
The battery device
A rechargeable battery for storing the electric energy;
Two main relays which are the power contacts (+, -) of the rechargeable battery;
A precharge relay relaying a relay of one of the two main relays; And
A precharge resistance connected to the precharge relay,
And the vehicle power charging device. 16. The method of claim 15,
Wherein the voltage of the battery device is applied between the two main relays after the two main relays are connected. 13. The method of claim 12,
Further comprising a connection unit connecting the battery device and the charger,
Wherein the connection portion includes a fuse for preventing an overcurrent from flowing. 13. The method of claim 12,
Wherein the charge controller starts the charging operation when the difference between the voltage of the battery and the output voltage of the charger is smaller than a predetermined range in the voltage comparison result,
And forcibly drives said charger if said difference is equal to or greater than said range. 13. The method of claim 12,
The charge controller
Comparing the output current of the charger with the charging current of the battery when the charger is forcibly driven,
And determines a failure site according to a result of the comparison of the currents, and terminates the charging operation. 20. The method of claim 19,
If the output current of the charger is equal to the charging current of the battery, the output voltage sensor of the charger is determined to be faulty,
And judges that at least one of the high-voltage cable and the fuse is broken if the output current of the charger is different from the charging current of the battery. 13. The method of claim 12,
A display unit for outputting a message in the form of a message, notification,
Further comprising: a second power supply for charging the vehicle. 13. The method of claim 12,
A communication device that transmits at least one of a message, an alarm, and a warning indicating the failure site through a wired / wireless communication network
Further comprising: a vehicle power regulator for regenerating the vehicle power.

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