JP2010239773A - Charger, electric vehicle, and ground fault / short circuit detection method in charging system - Google Patents

Abstract

During charging of an electric vehicle, both occurrence of a ground fault in a charger and occurrence of a short circuit in an electric vehicle are more accurately detected.
A combination of a ground fault detection method S1 adopted by a ground fault detection unit 105 of a charger 100 and a short circuit detection method S2 adopted by a short circuit detection unit 204 of an electric vehicle 200 is a combination of a ground fault detection unit 105 and a short circuit detection unit. 204, a closed loop is formed, and one of the ground fault detection unit 105 and the short circuit detection unit 204 is disconnected from the ground when there is a possibility of erroneous detection of a ground fault or a short circuit from an alternating current flowing therethrough. To prevent the formation of closed loops. Alternatively, one detection operation is stopped. On the other hand, the occurrence of a ground fault in charger 100 and the occurrence of a short circuit in electric vehicle 200 are detected.
[Selection] Figure 1

Description

  The present invention relates to a technique for detecting both occurrence of a ground fault in a charger and occurrence of a short circuit in an electric vehicle during charging of the electric vehicle by a charger.

  Patent Document 1 discloses a short circuit detection device that detects a short circuit of an in-vehicle battery mounted on an electric vehicle. This short-circuit detection device inserts a series circuit consisting of a capacitor and an AC power supply between one of a pair of charging lines that supply charging power to the on-vehicle battery and the ground, and detects a short circuit from the current flowing through this capacitor. To do. Hereinafter, this type of short-circuit detection method is referred to as a capacitor type.

  In addition to the capacitor type described above, the short-circuit detection device has a method of detecting a short circuit from a current flowing through the resistor or a voltage applied to the resistor by inserting a resistor between the object to be inspected and the ground. There is something. Hereinafter, this type of short circuit detection method is referred to as a resistance type.

JP 2005-20848 A

  In recent years, by using a quick charger, it is possible to charge an in-vehicle battery of an electric vehicle in a shorter time than when charging using a commercial power supply (usually it takes several hours to fully charge). Development of charging system is in progress. By installing quick chargers at various locations such as parking lots and dedicated charging stands, for example, it is possible to quickly charge electric vehicles on the go, which is considered to contribute to the spread of electric vehicles.

  In such a charging system, the quick charger is equipped with a ground fault detection device so that if a ground fault occurs during charging of the electric vehicle, the earth leakage breaker can be activated to cut off the power supply from the external power source. It is desirable to do. The ground fault detection method of the ground fault detection device can use a capacitor type and a resistance type as in the case of the short circuit detection device of the electric vehicle.

  However, depending on the combination of the short-circuit detection method employed in the short-circuit detection device for the electric vehicle and the ground fault detection method employed in the ground-fault detection device for the quick charger, there is a possibility that a short-circuit and a ground fault will be erroneously detected. Specifically, when the detection method of at least one of the short-circuit detection device of the electric vehicle and the ground fault detection device of the quick charger is a capacitor type, for example, when it is raining, one of the inspection objects (for charging the quick charger) Line or electric vehicle vehicle battery) and a capacitor inserted between the ground and the other test object and the resistor or capacitor inserted between the ground and a closed loop is formed, causing a short circuit in the electric vehicle or rapid When an alternating current similar to that when a ground fault occurs in the charger flows through the capacitor, the capacitor-type short-circuit detection device or the ground fault detection device erroneously detects the occurrence of a short circuit or a ground fault.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent both the occurrence of a ground fault in the charger and the occurrence of a short circuit in the electric vehicle during charging of the electric vehicle by the charger. It is to provide a technology that can be accurately detected.

  In order to solve the above problems, in the present invention, prior to the start of charging of the in-vehicle battery, the electric vehicle notifies the charger of the short-circuit detection method of the short-circuit detection means provided in the electric vehicle. On the other hand, the charger charges the ground fault detection means when the combination of the short circuit detection method notified from the electric vehicle and the ground fault detection method of the ground fault detection means included in the charger is one of the predetermined combinations. Disconnect from the work line or ground, or stop ground fault detection by the ground fault detection means, and then start charging the in-vehicle battery. Then, the electric vehicle notifies the charger of short circuit detection when a short circuit is detected by the short circuit detection means during charging of the on-vehicle battery. On the other hand, when a ground fault is detected by the ground fault detection means or when a short circuit detection is notified from the electric vehicle, the charger operates the earth leakage circuit breaker to cut off between the external power source and the charger. .

For example, the charger of the present invention is
A charger for charging an in-vehicle battery mounted on an electric vehicle,
AC / DC conversion means for converting AC power fed from an external power source into DC power and outputting charging power;
An earth leakage circuit breaker inserted between the external power source and the AC / DC converting means,
A charging line for supplying the charging power output from the AC / DC converter to the in-vehicle battery;
A ground fault detection means for detecting a ground fault of the charging line;
A ground fault detection relay inserted between the ground fault detection means and the charging line or ground;
Charger-side communication means for communicating with the electric vehicle;
When a ground fault is detected by the ground fault detection means, or when a short circuit detection is notified from the electric vehicle via the charger side communication means, the earth leakage circuit breaker is controlled, and the external power supply And a shutoff control means for shutting off between the AC / DC conversion means,
The shut-off control means includes
Prior to the start of charging of the in-vehicle battery, information on the short-circuit detection method of the short-circuit detection unit included in the electric vehicle is received from the electric vehicle via the charger-side communication unit, and the short-circuit detection method of the short-circuit detection unit And the ground fault detection method of the ground fault detection means is one of the predetermined combinations, the ground fault detection relay is opened or the ground fault detection by the ground fault detection means is stopped.

The electric vehicle of the present invention is
An electric vehicle equipped with an in-vehicle battery charged by the above charger,
A short circuit detecting means for detecting a short circuit of the in-vehicle battery;
Vehicle-side communication means for communicating with the charger;
Short-circuit control means for notifying the charger of short-circuit detection via the charger-side communication means when a short-circuit is detected by the short-circuit detection means,
The short-circuit control means includes
Prior to the start of charging of the in-vehicle battery, information related to a short-circuit detection method of the short-circuit detection means is transmitted to the charger via the vehicle-side communication means.

  In the present invention, a combination of the short-circuit detection method of the short-circuit detection unit of the electric vehicle and the ground fault detection method of the ground-fault detection unit of the charger forms a closed loop between the short-circuit detection unit and the ground fault detection unit. In the case of a combination in which the flowing AC current may be erroneously detected as a short circuit or a ground fault current, one of the short circuit detection means and the ground fault detection means is disconnected from the inspection object or the like, or the detection is stopped. For this reason, according to the present invention, it is possible to more accurately detect both the occurrence of a ground fault in the charger and the occurrence of a short circuit in the electric vehicle during charging of the electric vehicle by the charger.

FIG. 1 is a diagram for explaining a schematic configuration of a charging system according to an embodiment of the present invention. 2A is a diagram illustrating a configuration example of a ground fault detection unit 105 having a ground fault detection method of resistance type, and FIG. 2B is a diagram of a ground fault detection unit 105 having a ground fault detection method of a capacitor type. It is a figure which shows the example of a structure. FIG. 3A shows a flow of a direct current (ground fault current) when a ground fault occurs in the charging line 102B on the negative electrode side when the ground fault detection method of the ground fault detection unit 105 is a resistance type. FIG. 3B is a diagram illustrating a direct current (ground fault) when a ground fault occurs in the charging line 102A on the positive electrode side when the ground fault detection method of the ground fault detection unit 105 is a resistance type. It is a figure which shows the flow of an electric current. FIG. 4A shows the flow of an alternating current (ground fault current) when a ground fault occurs in the charging line 102B on the negative electrode side when the ground fault detection method of the ground fault detection unit 105 is a capacitor type. FIG. 4B is a diagram illustrating an alternating current (ground fault) when a ground fault occurs in the charging line 102A on the positive electrode side when the ground fault detection method of the ground fault detection unit 105 is a capacitor type. It is a figure which shows the flow of an electric current. FIG. 5 is a diagram for explaining the charging operation of the charger 100 shown in FIG. 1. FIG. 6 is a diagram for explaining a charging operation of electric vehicle 200 shown in FIG. FIG. 7A illustrates detection of a ground fault / short circuit when the ground fault detection method of the ground fault detection unit 105 of the charger 100 and the short circuit detection method of the short circuit detection unit 204 of the electric vehicle 200 are both of the resistance type. FIG. 7B shows a case where the ground fault detection method of the ground fault detection unit 105 of the charger 100 is a resistance type, and the short circuit detection method of the short circuit detection unit 204 of the electric vehicle 200 is a capacitor type. FIG. 7C illustrates a ground fault detection method of the ground fault detection unit 105 of the battery charger 100 and a short circuit detection method of the short circuit detection unit 204 of the electric vehicle 200. FIG. 5 is a diagram for explaining detection of a ground fault and a short circuit when both are capacitor types.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a schematic configuration diagram of a charging system according to an embodiment of the present invention.

  As illustrated, the charging system according to the present embodiment includes a charger 100 and an electric vehicle 200.

  First, the charger 100 will be described.

  The charger 100 includes a charger-side connector 101, a charging cable 102, an AC / DC converter 103, an ELB (leakage breaker) 104, a ground fault detector 105, a relay 106, a communication unit 107, and charging control. Part 108 and a control system power supply 109.

  The charger-side connector 101 includes a pair of charging lines (for example, 400V power supply line) 102A and 102B and a pair of communication lines 102C and 102D. When the charger-side connector 101 is attached to a vehicle-side connector 201 described later, these terminals come into contact with corresponding terminals of the vehicle-side connector 201, respectively. Thus, the pair of charging lines 102A and 102B and the pair of communication lines 102C and 102D are electrically connected to the pair of charging lines 202A and 202B and the pair of communication lines 202C and 202D of the electric vehicle 200, respectively. Connected to.

  The negative-side communication line 102D is connected to the ground of the charger 100, while the negative-side communication line 202D of the electric vehicle 200 is connected to the ground (vehicle body ground) of the electric vehicle 200. When both lines 102D and 202D are electrically connected, the ground of the charger 100 and the electric vehicle 200 is shared.

  The charging cable 102 accommodates a pair of charging lines 102A and 102B and a pair of communication lines 102C and 102D. A charger-side connector 101 is attached to the tip of the charging cable 102.

  The AC / DC converter 103 converts AC power supplied from the AC power supply 300 via the ELB 104 into DC power.

  The ELB 104 is disposed between the AC power supply 300 and the AC / DC conversion unit 103, and blocks AC power supplied from the AC power supply 300 to the AC / DC conversion unit 103 under the control of the charging control unit 108.

  The ground fault detection unit 105 detects a ground fault generated in the charging lines 102 </ b> A and 102 </ b> B and the AC / DC conversion unit 103 by either a resistance type or a capacitor type ground fault detection method.

  FIG. 2A is a diagram illustrating a configuration example of the ground fault detection unit 105 having a resistance type ground fault detection method. In this example, the ground fault detection unit 105 includes a series circuit 1051 formed of two resistors 1051A and 1051B having the same resistance value inserted between a pair of charging lines 102A and 102B, and wiring connecting the resistors 1051A and 1051B. A current detector 1052 connected between an appropriate position (for example, a position where the resistance is equally divided into two, hereinafter referred to as a ground connection point) and the relay 106; The current detector 1052 sequentially measures a direct current flowing between the ground connection point and the ground via the relay 106 and outputs the direct current to the charging control unit 108. For the current detector 1052, for example, a current transformer (DC CT) is used.

As shown in FIG. 3A, when a ground fault occurs at an arbitrary position (ground fault point) P1 of the charging line 102B on the negative electrode side with the relay 106 closed, the ground fault point P1 and the ground closed loop is formed between the, ground fault current _{I 1} which flows from the ground to the ground絡点P1 is charging line 102B of the negative electrode side, AC-DC converter 103, via a charging line 102A of the positive electrode side, and the resistor 1051A And return to earth. Current detector 1052 detects the ground fault current _{I 1.}

On the other hand, as shown in FIG. 3B, when a ground fault occurs at an arbitrary position (ground fault point) P2 of the charging line 102A on the positive electrode side in a state in which the relay 106 is closed, A closed loop is formed with the ground, and the ground fault current I ₂ flowing into the ground from the ground fault point P2 is the resistor 1051B, the negative charging line 102B, the AC / DC converter 103, and the positive charging line 102A. Return to ground via. Current detector 1052 detects the ground fault current _{I 2.}

  In the resistance type, a voltage detector is used instead of the current detector 1052, and the voltage value of the ground connection point is measured, and the occurrence of a ground fault is detected from the potential difference between the measured value and the ground potential. Also good.

  FIG. 2B is a diagram illustrating a configuration example of the ground fault detection unit 105 having a capacitor type ground fault detection method. In this example, the ground fault detection unit 105 has a series circuit including a capacitor 1053, an AC power source 1054, and a current detector 1055 inserted between the charging line 102B on the negative electrode side and the relay 106. The AC power supply 1054 generates an AC voltage. The current detector 1055 sequentially measures the alternating current flowing to the ground via the capacitor 1053 and outputs it to the charging control unit 108. As the current detector 1055, for example, a current transformer (CT) is used. In this case, the charging control unit 108 detects an alternating current at the time of occurrence of a ground fault by a calculation process (fast Fourier transform or the like) of an output from the current detector 1055. In this example, the capacitor 1053 is connected to the charging line 102B on the negative electrode side, but may be connected to the charging line 102A on the positive electrode side.

As shown in FIG. 4A, when a ground fault occurs at an arbitrary position (ground fault point) P3 of the charging line 102B on the negative electrode side with the relay 106 closed, the ground fault point P3 and the ground Closed loop is formed, and the ground fault current I ₃ flows through the capacitor 1053. Current detector 1055 detects the ground fault current _{I 3.}

On the other hand, as shown in FIG. 4B, when a ground fault occurs at an arbitrary position (ground fault point) P4 of the charging line 102A on the positive electrode side in a state in which the relay 106 is closed, A closed loop is formed with the ground, and a ground fault current I ₄ flows through the capacitor 1053. Current detector 1055 detects the ground fault current _{I 4.}

  Returning to FIG. 1, the description will be continued.

  The relay 106 opens and closes under the control of the charging control unit 108 to disconnect or connect the ground fault detection unit 105 from the ground. The relay 106 includes a ground fault detection unit 105 and a charging line to which the ground fault detection unit 105 is connected (if the ground fault detection unit 105 is a resistance type, one of the charging lines 102A and 102B, When the ground fault detection unit 105 is a capacitor type, it may be disposed between the ground fault detection unit 105 and the charging line to which the ground fault detection unit 105 is connected.

  The communication unit 107 communicates with the electric vehicle 200 via a pair of communication lines 102C and 102D.

  The charging control unit 108 performs overall control of each unit of the charger 100.

  The control system power supply 109 is a power supply (for example, 12V power supply) for supplying control power to the communication / control system such as the relay 106, the communication unit 107, and the charge control unit 108. The control system power supply 109 may be a battery or a power supply that outputs DC power generated by rectifying AC power supplied from the AC power supply 300 or a commercial power supply (not shown).

  Next, the electric vehicle 200 will be described.

  The electric vehicle 200 includes a vehicle-side connector 201, an in-vehicle battery 203, a short circuit detection unit 204, a relay 205, a communication unit 206, a battery control unit 207, and an auxiliary battery 208.

  The vehicle-side connector 201 includes terminals of a pair of charging lines 202A and 202B and a pair of communication lines 202C and 202D. When the charger-side connector 101 is attached to the vehicle-side connector 201, these terminals abut against corresponding terminals of the charger-side connector 101, respectively. Thereby, as described above, the pair of charging lines 202A and 202B and the pair of communication lines 202C and 202D are replaced with the pair of charging lines 102A and 102B and the pair of communication lines 102C of the charger 100, respectively. , 102D.

  The in-vehicle battery 203 is a battery for supplying drive power to a drive system such as a motor or an inverter.

  The short-circuit detection unit 204 detects a short-circuit that has occurred in the charging lines 202A and 202B and the in-vehicle battery 203 by using either a resistance-type or capacitor-type short-circuit detection method. The resistance-type and capacitor-type short-circuit detection methods are the same as the resistance-type and capacitor-type ground fault detection methods described with reference to FIGS.

  The relay 205 opens and closes under the control of the battery control unit 207 to disconnect or connect the short-circuit detection unit 204 from the ground. Note that the relay 205 includes a short-circuit detection unit 204 and a charging line to which the short-circuit detection unit 204 is connected (if the short-circuit detection unit 204 is a resistance type, one of the charging lines 202A and 202B, the short-circuit detection unit). In the case where the capacitor 204 is a capacitor type, it may be provided with the charging line to which the short-circuit detecting unit 204 is connected.

  In the example illustrated in FIG. 1, the electric vehicle 200 including the relay 205 is illustrated. However, in the electric vehicle 200, the relay 205 is not an essential configuration. However, when the relay 205 is not provided in the electric vehicle 200, the short circuit detection unit 204 cannot be disconnected from the ground.

  The communication unit 206 communicates with the charger 100 via a pair of communication lines 202C and 202D.

  The battery control unit 207 is realized as a part of the function of an ECU (Electric Control Unit), for example, and controls charging of the in-vehicle battery 203.

  The auxiliary battery 208 is a power source (for example, 12V power source) for supplying control power to a communication / control system such as the relay 205, the communication unit 206, and the battery control unit 207. In addition, you may abbreviate | omit the auxiliary battery 208 by utilizing a part of electric power supplied from the vehicle-mounted battery 203 for control electric power.

  Next, the charging operation of the charging system will be described.

  FIG. 5 is a diagram for explaining the charging operation of the charger 100 shown in FIG. 1.

  This flow is obtained when the charger 100 receives an instruction to start charging from an operator via an operation panel (not shown) or the like in a state where the attachment of the charger-side connector 101 and the vehicle-side connector 201 is locked. Be started.

  First, the charging control unit 108 generates ground fault detection method related information including the ground fault detection method S1 employed by the ground fault detection unit 105. And this ground fault detection system relevant information is transmitted to the electric vehicle 200 via the communication part 107 and the charger side connector 101 with the charge start notification (S101).

  Next, the charging control unit 108 waits for the short-circuit detection method related information including the short-circuit detection method S2 adopted by the short-circuit detection unit 204 from the electric vehicle 200 to be sent within a predetermined time together with the preparation completion notification. (S102).

  If the short-circuit detection method related information is not received together with the preparation completion notification within a predetermined time (TIME OUT in S102), the charging control unit 108 displays the charger 100 on the electric vehicle 200 to be charged on the display panel (not shown). Predetermined error processing such as displaying a message indicating that it is not supported is performed (S118).

  On the other hand, when the short-circuit detection method related information is received together with the preparation completion notification within a predetermined time (YES in S102), the charging control unit 108 detects the ground fault detection method S1 adopted by the ground fault detection unit 105 and the electric vehicle 200. The combination with the short circuit detection method S2 employed by the short circuit detection unit 204 is determined (S103).

  When both the ground fault detection method S1 of the ground fault detection unit 105 and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 are resistance types (“S1: resistance S2: resistance” in S103), the charging control unit 108 The ELB 104 is controlled to connect the AC / DC converter 103 to the AC power source 300. As a result, charging power is output from the AC / DC converter 103 to the pair of charging lines 102A and 102B, and charging of the in-vehicle battery 203 is started (S110).

  When the ground fault detection method S1 of the ground fault detection unit 105 is a resistance type and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 is a capacitor type ("S1: resistance S2: capacitor" in S103), charging control The unit 108 determines whether or not the short-circuit detection method related information received together with the preparation completion notification from the electric vehicle 200 includes a message indicating that the detection operation of the short-circuit detection unit 204 can be stopped (S104). If a message to that effect is included (YES in S104), the charging control unit 108 controls the ELB 104 to connect the AC / DC converting unit 103 to the AC power source 300 and starts charging the in-vehicle battery 203 ( S110). On the other hand, if the message to that effect is not included (NO in S104), charging control unit 108 opens relay 106 and disconnects ground fault detection unit 105 from the ground (S105). Then, the charging control unit 108 controls the ELB 104 to connect the AC / DC converting unit 103 to the AC power source 300 and starts charging the in-vehicle battery 203 (S110).

  When the ground fault detection method S1 of the ground fault detection unit 105 is a capacitor type and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 is a resistance type ("S1: capacitor S2: resistance" in S103), charging control The unit 108 determines whether or not the short-circuit detection method related information received together with the preparation completion notification from the electric vehicle 200 includes a message indicating that the short-circuit detection unit 204 can be disconnected from the ground (S106). If a message to that effect is included (YES in S106), the charging control unit 108 controls the ELB 104 to connect the AC / DC converting unit 103 to the AC power source 300 and starts charging the in-vehicle battery 203 ( S110). On the other hand, if the message to that effect is not included (NO in S106), charging control unit 108 stops ground fault detection based on the measurement values sequentially output from ground fault detection unit 105 (S107). Alternatively, the relay 106 is opened to disconnect the ground fault detection unit 105 from the ground. Then, the charging control unit 108 controls the ELB 104 to connect the AC / DC converting unit 103 to the AC power source 300 and starts charging the in-vehicle battery 203 (S110).

  When both the ground fault detection method S1 of the ground fault detection unit 105 and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 are capacitor types (“S1: capacitor S2: capacitor” in S103), the charging control unit 108 It is determined whether or not the short-circuit detection method related information received together with the preparation completion notification from the electric vehicle 200 includes a message indicating that the short-circuit detection unit 204 can be disconnected from the ground (S108). If a message to that effect is included (YES in S108), the charging control unit 108 controls the ELB 104 to connect the AC / DC converting unit 103 to the AC power source 300 and starts charging the in-vehicle battery 203 ( S110). On the other hand, if the message to that effect is not included (NO in S108), charging control unit 108 opens relay 106 and disconnects ground fault detection unit 105 from the ground (S109). Then, the charging control unit 108 controls the ELB 104 to connect the AC / DC converting unit 103 to the AC power source 300 and starts charging the in-vehicle battery 203 (S110).

  When the charging control unit 108 starts charging the in-vehicle battery 203, whether or not a predetermined charging end condition is satisfied based on an output voltage value of charging power measured by a voltmeter (not shown) or not. Is determined (S111). If the charging end condition is satisfied (YES in S111), the ELB 104 is controlled to disconnect the AC / DC converter 103 from the AC power supply 300. As a result, the output of the charging power from the AC / DC conversion unit 103 to the pair of charging lines 102A and 102B is stopped, and the charging of the in-vehicle battery 203 ends (S112).

  Then, the charging control unit 108 transmits a normal end notification indicating that charging of the in-vehicle battery 203 has ended normally to the electric vehicle 200 via the communication unit 107 and the charger-side connector 101 (S113).

  In addition, the charging control unit 108 detects the occurrence of a ground fault from the output value of the ground fault detection unit 105 during the charging of the in-vehicle battery 203 (NO in S111), or via the communication unit 107. If the short circuit occurrence notification is received from the electric vehicle 200 (YES in S115), the ELB 104 is controlled to disconnect the AC / DC converter 103 from the AC power supply 300, and the charging of the in-vehicle battery 203 is stopped (S116).

  Then, the charging control unit 108 transmits an abnormal end notification indicating that charging of the in-vehicle battery 203 has ended abnormally due to the occurrence of a ground fault to the electric vehicle 200 via the communication unit 107 and the charger side connector 101 (S117). ).

  FIG. 6 is a diagram for explaining a charging operation of electric vehicle 200 shown in FIG.

  In this flow, in a state where the attachment of the charger-side connector 101 and the vehicle-side connector 201 is locked, the battery control unit 207 sends a charge start notification from the charger 100 via the communication unit 206 to the ground fault detection unit. It is started by receiving together with the ground fault detection method related information including the ground fault detection method S1 adopted by 105.

  First, the battery control unit 207 determines a combination of the ground fault detection method S1 adopted by the ground fault detection unit 105 of the charger 100 and the short circuit detection method S2 adopted by the short circuit detection unit 204 (S201).

  When the ground fault detection method S1 of the ground fault detection unit 105 of the charger 100 and the short circuit detection method S2 of the short circuit detection unit 204 are both resistance type (“S1: resistance S2: resistance” in S201), the battery control unit 207 The short circuit detection method related information including the short circuit detection method S2 employed by the short circuit detection unit 204 is generated. Then, the short-circuit detection method related information is transmitted to the charger 100 through the communication unit 206 and the vehicle-side connector 201 together with the preparation completion notification (S208).

  When the ground fault detection method S1 of the ground fault detection unit 105 of the charger 100 is a resistance type and the short circuit detection method S2 of the short circuit detection unit 204 is a capacitor type ("S1: resistance S2: capacitor" in S201), battery control The unit 207 determines whether or not the detection operation of the short circuit detection unit 204 can be stopped (S202). If the detection operation of the short circuit detection unit 204 can be stopped (YES in S202), the battery control unit 207 stops the short circuit detection operation based on the output of the short circuit detection unit 204 (S203). When the relay 205 is provided, the relay 205 may be opened instead of stopping the detection operation of the short circuit detection unit 204. Then, the battery control unit 207 generates short circuit detection method related information including the short circuit detection method S2 employed by the short circuit detection unit 204 and a message indicating that the detection operation of the short circuit detection unit 204 can be stopped. Then, the short-circuit detection method related information is transmitted to the charger 100 through the communication unit 206 and the vehicle-side connector 201 together with the preparation completion notification (S208). On the other hand, if the detection operation of the short circuit detection unit 204 cannot be stopped (NO in S202), the battery control unit 207 generates short circuit detection method related information including the short circuit detection method S2 adopted by the short circuit detection unit 204. Then, the short-circuit detection method related information is transmitted to the charger 100 through the communication unit 206 and the vehicle-side connector 201 together with the preparation completion notification (S208).

  When ground fault detection method S1 of ground fault detection unit 105 of charger 100 is a capacitor type and short circuit detection method S2 of short circuit detection unit 204 is a resistance type ("S1: capacitor S2: resistance" in S201), battery control The unit 207 determines whether or not the short circuit detection unit 204 can be disconnected from the ground by the relay 205 (S204). If short circuit detection unit 204 can be disconnected from the ground (YES in S204), battery control unit 207 opens relay 205 to disconnect short circuit detection unit 204 from the ground (S205). Then, the battery control unit 207 generates short-circuit detection method related information including the short-circuit detection method S2 employed by the short-circuit detection unit 204 and a message indicating that the short-circuit detection unit 204 can be disconnected from the ground. Then, the short-circuit detection method related information is transmitted to the charger 100 through the communication unit 206 and the vehicle-side connector 201 together with the preparation completion notification (S208). On the other hand, if the short circuit detection unit 204 cannot be disconnected from the ground (NO in S204), the battery control unit 207 generates short circuit detection method related information including the short circuit detection method S2 adopted by the short circuit detection unit 204. Then, the short-circuit detection method related information is transmitted to the charger 100 through the communication unit 206 and the vehicle-side connector 201 together with the preparation completion notification (S208).

  When both the ground fault detection method S1 of the ground fault detection unit 105 of the charger 100 and the short circuit detection method S2 of the short circuit detection unit 204 are capacitor types (“S1: capacitor S2: capacitor” in S201), the battery control unit 207 It is determined whether or not the short circuit detector 204 can be disconnected from the ground by the relay 205 (S206). If short circuit detection unit 204 can be disconnected from the ground (YES in S206), battery control unit 207 opens relay 205 and disconnects short circuit detection unit 204 from the ground (S207). Then, the battery control unit 207 generates short-circuit detection method related information including the short-circuit detection method S2 employed by the short-circuit detection unit 204 and a message indicating that the short-circuit detection unit 204 can be disconnected from the ground. Then, the short-circuit detection method related information is transmitted to the charger 100 through the communication unit 206 and the vehicle-side connector 201 together with the preparation completion notification (S208). On the other hand, if short circuit detection unit 204 cannot be disconnected from the ground (NO in S206), battery control unit 207 generates short circuit detection method related information including short circuit detection method S2 employed by short circuit detection unit 204. Then, the short-circuit detection method related information is transmitted to the charger 100 through the communication unit 206 and the vehicle-side connector 201 together with the preparation completion notification (S208).

  After transmitting the notification of completion of preparation, if battery control unit 207 receives a normal end notification from charger 100 via vehicle-side connector 201 and communication unit 206 (YES in S209), battery-side connector 101 and vehicle-side A predetermined normal termination process such as releasing the mounting lock with the connector 201 is performed (S210).

  If battery control unit 207 receives an abnormal end notification from charger 100 (YES in S211), battery controller 207 shows electric vehicle 200 while the attachment of charger-side connector 101 and vehicle-side connector 201 is locked. A predetermined abnormal termination process such as displaying a message indicating that the charging has terminated abnormally on a display panel that has not been performed is performed (S212).

  Further, when the battery control unit 207 detects occurrence of a short circuit from the output value of the short circuit detection unit 204 (YES in S213), the battery control unit 207 locks the attachment of the charger side connector 101 and the vehicle side connector 201 and A predetermined abnormal termination process such as displaying a message indicating that the charging has ended abnormally is displayed on a display panel (not shown) (S214), and short-circuited to the charger 100 via the communication unit 206 and the vehicle-side connector 201. An occurrence notification is transmitted (S215).

  The embodiment of the present invention has been described above.

  In the present embodiment, according to the combination of the ground fault detection method S1 adopted by the ground fault detection unit 105 of the charger 100 and the short circuit detection method S2 adopted by the short circuit detection unit 204 of the electric vehicle 200, the ground of the charger 100 is selected. The detection operation and connection of the short circuit detection unit 204 and the short circuit detection unit 204 of the electric vehicle 200 are controlled. Specifically, it is as follows.

  As shown in FIG. 7A, when the ground fault detection method S1 of the ground fault detection unit 105 of the charger 100 and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 are both resistance type, charging on the positive electrode side is performed. If neither a ground fault nor a short circuit occurs in any of the charging lines 102A and 202A and the negative charging lines 102B and 202B, the ground connection points of the ground fault detection unit 105 and the short circuit detection unit 204 are both set to the ground potential. Therefore, no direct current flows between each ground connection point and the ground. For this reason, even if both operate | moving simultaneously, the ground fault detection part 105 and the short circuit detection part 204 do not falsely detect a ground fault and a short circuit due to it.

  Therefore, in the present embodiment, when the ground fault detection method S1 of the ground fault detection unit 105 of the charger 100 and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 are both resistance type, the ground fault detection unit 105 is used. Each of the short-circuit detection units 204 is operated to detect a ground fault / short-circuit.

7B, the ground fault detection method S1 of the ground fault detection unit 105 of the charger 100 is a resistance type, and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 is a capacitor type. In this case, the ground connection point of the ground fault detection unit 105 becomes the ground potential if no ground fault or short circuit occurs in any of the positive charge lines 102A and 202A and the negative charge lines 102B and 202B. Therefore, no direct current flows between the ground connection point and the ground. For this reason, even if the ground fault detection unit 105 and the short circuit detection unit 204 are operated simultaneously, the ground fault detection unit 105 does not erroneously detect a ground fault or a short circuit due to the operation. Meanwhile, since the closed loop formed between ground fault detection unit 105 and the short circuit detection unit 204 alternating current flows I _5, when operating the a ground fault detection portion 105 and a short circuit detection unit 204 simultaneously, shorting cause it The detection unit 204 erroneously detects a ground fault / short circuit.

  Therefore, in the present embodiment, in electric vehicle 200, detection operation of short circuit detection unit 204 is stopped, or relay 205 is opened to disconnect short circuit detection unit 204 from the ground, and only ground fault detection unit 105 of charger 100 is detected. Thus, a ground fault on the charger 100 side and a short circuit on the electric vehicle 200 side are detected. In the electric vehicle 200, when the detection operation of the short-circuit detection unit 204 cannot be stopped and the short-circuit detection unit 204 cannot be disconnected from the ground, in the charger 100, the relay 106 is opened and the ground fault detection unit 105 is grounded. Thus, the formation of a closed loop is prevented by disconnecting from the ground, and thus the ground fault on the charger 100 side and the short circuit on the electric vehicle 200 side are detected only by the short circuit detection unit 204 of the electric vehicle 200. The same applies when the ground fault detection method S1 of the ground fault detection unit 105 of the charger 100 is a capacitor type and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 is a resistance type.

In addition, as shown in FIG. 7C, when the ground fault detection method S1 of the ground fault detection unit 105 of the charger 100 and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 are both capacitor type, since the closed loop formed between the detection unit 105 and the short circuit detection unit 204 alternating current flows I _6, ground fault detection unit 105, a short circuit detecting unit 204 to operate the respective ground fault detection unit 105 causes it, short The detection unit 204 erroneously detects a ground fault / short circuit.

  Therefore, in the present embodiment, in electric vehicle 200, relay 205 is opened and short circuit detection unit 204 is disconnected from the ground to prevent the formation of a closed loop, and charger 100 is only connected to ground fault detection unit 105 of charger 100. A ground fault on the side and a short circuit on the electric vehicle 200 side are detected. When the short circuit detection unit 204 of the electric vehicle 200 cannot be disconnected from the ground, the charger 100 opens the relay 106 and disconnects the ground fault detection unit 105 from the ground, thereby preventing the formation of the closed loop. Only the short-circuit detection unit 204 detects a ground fault on the charger 100 side and a short-circuit on the electric vehicle 200 side.

  Thus, according to the present embodiment, the combination of the ground fault detection method S1 of the ground fault detection unit 105 of the charger 100 and the short circuit detection method S2 of the short circuit detection unit 204 of the electric vehicle 200 is combined with the ground fault detection unit 105. When a closed loop is formed with the short-circuit detection unit 204 and there is a possibility of erroneously detecting a ground fault or a short circuit from the alternating current flowing therethrough, one of the ground fault detection unit 105 and the short-circuit detection unit 204 is connected. Disconnect from earth or stop detection. For this reason, according to the present embodiment, it is possible to more accurately detect both the occurrence of a ground fault in charger 100 and the occurrence of a short circuit in electric vehicle 200 during charging of electric vehicle 200.

  In S118 of FIG. 5, instead of performing the predetermined error processing, the in-vehicle battery of the electric vehicle 200 is charged in the charger 100 in a predetermined charging mode (for example, a charging mode that takes more time than quick charging). 203 may be charged.

  Further, the present invention can be widely applied not only to the electric vehicle 200 but also to an electric vehicle having a function of charging an installed battery from an external power source.

100: charger, 101: charger side connector, 102: charging cable, 102A, 102B: charging line, 102C, 102D: communication line, 103: AC / DC converter, 104: ELB, 105: ground fault detector, 106: relay, 107: communication unit, 108: charge control unit, 109: control system power supply, 200: electric vehicle, 201: vehicle side connector, 202A, 202B: charging line, 202C, 202D: communication line, 203: In-vehicle battery, 204: short circuit detection unit, 205: relay, 206: communication unit, 207: battery control unit, 208: auxiliary battery, 300: AC power supply, 1051: series circuit, 1051A, 1051B: resistance, 1052: current detector , 1053: capacitor, 1054: AC power supply, 1055: current detector

Claims (11)

A charger for charging an in-vehicle battery mounted on an electric vehicle,
AC / DC conversion means for converting AC power fed from an external power source into DC power and outputting charging power;
An earth leakage circuit breaker inserted between the external power source and the AC / DC converting means,
A charging line for supplying the charging power output from the AC / DC converter to the in-vehicle battery;
A ground fault detection means for detecting a ground fault of the charging line;
A ground fault detection relay inserted between the ground fault detection means and the charging line or ground;
Charger-side communication means for communicating with the electric vehicle;
When a ground fault is detected by the ground fault detection means, or when a short circuit detection is notified from the electric vehicle via the charger side communication means, the earth leakage circuit breaker is controlled, and the external power supply And a shutoff control means for shutting off between the AC / DC conversion means,
The shut-off control means includes
Prior to the start of charging of the in-vehicle battery, information on the short-circuit detection method of the short-circuit detection unit included in the electric vehicle is received from the electric vehicle via the charger-side communication unit, and the short-circuit detection method of the short-circuit detection unit When the combination of the ground fault detection means and the ground fault detection method is one of the predetermined combinations, the ground fault detection relay is opened or the ground fault detection by the ground fault detection means is stopped. Characteristic charger. The charger according to claim 1,
The predetermined combination is a capacitor type in which the short circuit detection method detects a short circuit from an alternating current flowing through the capacitor by inserting a series circuit composed of a capacitor and an AC power source between the in-vehicle battery and the ground. A ground fault detection method is a resistance type in which a resistor is inserted between the charging line and the ground and a ground fault is detected from a current flowing through the resistor or a voltage applied to the resistor. Including
When the combination of the short-circuit detection method of the short-circuit detection unit and the ground-fault detection method of the ground-fault detection unit is the first combination, the shut-off control unit opens the ground-fault detection relay. Characteristic charger. The charger according to claim 1 or 2,
In the predetermined combination, the short circuit detection method is the capacitor type in which a series circuit including a capacitor and an AC power supply is inserted between the in-vehicle battery and the ground, and the ground fault detection method includes the charging line and the charging line. Inserting a series circuit consisting of a capacitor and an AC power supply between the ground, including a second combination that is a capacitor type that detects a ground fault from an AC current flowing through the capacitor,
When the combination of the short-circuit detection method of the short-circuit detection unit and the ground-fault detection method of the ground-fault detection unit is the second combination, the shut-off control unit opens the ground-fault detection relay. Characteristic charger. The charger according to any one of claims 1 to 3,
The predetermined combination is a resistance type in which the short circuit detection method detects a short circuit from a current flowing through the resistor or a voltage applied to the resistor by inserting a resistor between the vehicle battery and the ground. The ground fault detection method includes a third combination of the capacitor type in which a series circuit including a capacitor and an AC power supply is inserted between the charging line and the ground.
When the combination of the short-circuit detection method of the short-circuit detection unit and the ground-fault detection method of the ground-fault detection unit is the third combination, the shut-off control unit opens the ground-fault detection relay, or A charger characterized in that ground fault detection by the ground fault detection means is stopped. The charger according to any one of claims 1 to 4,
The shut-off control means includes
The information on the ground fault detection method is transmitted to the electric vehicle via the charger-side communication means, and the information on the short circuit detection method of the short detection means is transmitted from the electric vehicle together with the information on the short circuit detection method of the in-vehicle battery. When the notification that the disconnection is possible is received, even if the combination of the ground fault detection method of the ground fault detection means and the short circuit detection method of the short circuit detection means is any one of the predetermined combinations, A battery charger characterized by not opening a ground fault detection relay or stopping ground fault detection by the ground fault detection means. The charger according to any one of claims 1 to 5,
The shut-off control means includes
The information on the ground fault detection method is transmitted to the electric vehicle via the charger-side communication means, and the information on the short circuit detection method of the short detection means is transmitted from the electric vehicle together with the information on the short circuit detection method of the in-vehicle battery. When the notification that the short circuit detection by the short circuit can be stopped is received, the combination of the ground fault detection method of the ground fault detection means and the short circuit detection method of the short circuit detection means is any one of the predetermined combinations. If the ground fault detection method of the ground fault detection means is the resistance type in which a resistance is inserted between the charging line and the ground, the ground fault detection relay is opened or the ground fault detection means. A charger that does not stop ground fault detection by the The charger according to any one of claims 1 to 6,
The shut-off control means includes
When a ground fault is detected by the ground fault detection unit, the electric vehicle is notified of ground fault detection via the charger side communication unit. An electric vehicle equipped with an in-vehicle battery charged by the charger according to any one of claims 1 to 7,
A short circuit detecting means for detecting a short circuit of the in-vehicle battery;
Vehicle-side communication means for communicating with the charger;
Short-circuit control means for notifying the charger of short-circuit detection via the charger-side communication means when a short-circuit is detected by the short-circuit detection means,
The short-circuit control means includes
Prior to the start of charging of the in-vehicle battery, information on a short-circuit detection method of the short-circuit detection unit is transmitted to the charger via the vehicle-side communication unit. An electric vehicle equipped with an in-vehicle battery charged by the charger according to claim 5,
A short circuit detecting means for detecting a short circuit of the in-vehicle battery;
A short-circuit detection relay inserted between the short-circuit detection means and the in-vehicle battery or the ground;
Vehicle-side communication means for communicating with the charger;
Short-circuit control means for notifying the charger of short-circuit detection via the charger-side communication means when a short-circuit is detected by the short-circuit detection means,
The short-circuit control means includes
Prior to the start of charging of the in-vehicle battery, information on the ground fault detection method of the ground fault detection means is received from the charger via the vehicle side communication means, and the short-circuit detection means is connected to the charger. Sends information on the short-circuit detection method and a notification that the short-circuit detection means can be disconnected from the in-vehicle battery, and the short-circuit detection method of the short-circuit detection means and the ground-fault detection method of the ground-fault detection means When the combination is any of the predetermined combinations, the short-circuit detection relay is opened. An electric vehicle equipped with an in-vehicle battery charged by the charger according to claim 6,
A short circuit detecting means for detecting a short circuit of the in-vehicle battery;
Vehicle-side communication means for communicating with the charger;
Short-circuit control means for notifying the charger of short-circuit detection via the charger-side communication means when a short-circuit is detected by the short-circuit detection means,
The short-circuit control means includes
Prior to the start of charging of the in-vehicle battery, information on the ground fault detection method of the ground fault detection means is received from the charger via the vehicle side communication means, and the short-circuit detection means is connected to the charger. Sends information on short-circuit detection method and notification that short-circuit detection by the short-circuit detection unit can be stopped, and a combination of the short-circuit detection method of the short-circuit detection unit and the ground-fault detection method of the ground-fault detection unit Is one of the predetermined combinations, and the ground fault detection method of the ground fault detection means is the resistance type in which a resistance is inserted between the charging line and the ground, the short circuit detection means An electric vehicle characterized by stopping short circuit detection. An electric vehicle equipped with an in-vehicle battery, and a charger for charging the in-vehicle battery via a charging line, a ground fault / short circuit detection method in a charging system,
Prior to starting charging of the in-vehicle battery,
The electric vehicle transmits, to the charger, information related to a short circuit detection method of a short circuit detection unit that detects a short circuit of the in-vehicle battery,
The charger is a combination of a short-circuit detection method of the short-circuit detection means and a ground-fault detection method of a ground-fault detection means that is inserted between the charging line and the ground and detects a ground fault of the charging line. Is one of the predetermined combinations, the ground fault detection means is disconnected from the charging line or ground, or the ground fault detection by the ground fault detection means is stopped, and then charging of the in-vehicle battery is started. And
During charging of the in-vehicle battery,
The electric vehicle notifies the charger of short circuit detection when a short circuit is detected by the short circuit detection means,
When the ground fault is detected by the ground fault detection means, or when the short circuit detection is notified from the electric vehicle, the charger operates an earth leakage breaker between the external power source and the charger. A ground fault / short circuit detection method in a charging system.

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