Electric vehicle charging device

Abstract

An electric vehicle charging device according to one embodiment of the present invention includes a charging control unit that generates a control signal for charging, a connection unit connected to an EVSE (Electric Vehicle Supply Equipment) that transmits power received from the EVSE to the battery in accordance with the control signal for charging, and a detection unit, wherein the connection unit includes a first pin that receives a first charging sequence signal from the EVSE, a second pin that receives a second charging sequence signal from the EVSE, a third pin that receives a connector proximity detection signal from the EVSE, a fourth pin that transmits a charging permission signal to the EVSE, and a rapid terminal that receives power from the EVSE, and the detection unit detects a short circuit or open circuit between the EVSE and the fourth pin.

Description

Technical Field

[0001] The present invention relates to electric vehicles, and more particularly to charging of electric vehicles.

Background Art

[0002] Environmentally friendly vehicles such as electric vehicles (EVs) or plug-in hybrid electric vehicles (PHEVs) utilize electric vehicle supply equipment (EVSE) installed at charging stations to charge their batteries.

[0003] For charging an electric vehicle, the EV and the EVSE communicate via a charging connector connected between the EVSE and the EV. When the charging connector is connected between the EVSE and the EV, signaling for charging is performed between the EVSE and the EV, and then charging is started.

[0004] At this time, there is a need to detect a short circuit or disconnection between the connection pins of the EVSE and the EV during the signaling process between the EVSE and the EV.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The technical problem to be achieved by the present invention is to provide a charging device for charging an electric vehicle.

Means for Solving the Problems

[0006] An electric vehicle charging device according to one embodiment of the present invention includes a charging control unit that generates a control signal for charging, a connection unit connected to an EVSE (Electric Vehicle Supply Equipment) that transmits power received from the EVSE to the battery in accordance with the control signal for charging, and a detection unit, wherein the connection unit includes a first pin that receives a first charging sequence signal from the EVSE, a second pin that receives a second charging sequence signal from the EVSE, a third pin that receives a connector proximity detection signal from the EVSE, a fourth pin that transmits a charging permission signal to the EVSE, and a rapid terminal that receives power from the EVSE, and the detection unit detects a short circuit or open circuit between the EVSE and the fourth pin.

[0007] The detection unit can detect at least one of the following: a disconnection between the EVSE and the fourth pin, a ground short circuit between the EVSE and the fourth pin, and a battery short circuit between the EVSE and the fourth pin.

[0008] A disconnection between the EVSE and the fourth pin and a ground short circuit between the EVSE and the fourth pin can be detected depending on the connection status between the EVSE and the connector, while a battery short circuit between the EVSE and the fourth pin can be detected when the EVSE and the connector are not connected.

[0009] When the EVSE and the connection part are connected, if the detection unit reads 0V, it indicates a disconnection between the EVSE and the fourth pin or a ground short circuit between the EVSE and the fourth pin. When the EVSE and the connection part are not connected, if the detection unit reads a voltage greater than 0V, it may indicate a battery short circuit between the EVSE and the fourth pin.

[0010] The fourth pin further includes a transistor connected to the EVSE and a resistor placed between the transistor and ground, and the detection unit may be connected to the node between the transistor and the resistor.

[0011] The detection unit can detect the voltage across the resistor.

[0012] The detection unit may include an amplifier.

[0013] The fourth pin may further include a filter positioned between the EVSE and the transistor.

[0014] The aforementioned resistance may be 3.5 kΩ or less.

[0015] The maximum voltage across the transistor may be 0.5V.

[0016] An electric vehicle charging system according to one embodiment of the present invention comprises a first charging device installed in an EV (Electric Vehicle) and an EVSE (Electric Vehicle Supply) The first charging device includes a second charging device located in the EVSE, and the first charging device includes a first pin for receiving a first charging sequence signal from the EVSE, a second pin for receiving a second charging sequence signal from the EVSE, a third pin for receiving a connector proximity detection signal from the EVSE, a fourth pin for transmitting a charging permission signal to the EVSE, a detection unit for detecting a disconnection or short circuit between the EVSE and the fourth pin, and a first fast terminal for receiving power from the EVSE. The second charging device includes a fifth pin for transmitting the first charging sequence signal to the EV, a sixth pin for transmitting the second charging sequence signal to the EV, a seventh pin for transmitting the connector proximity detection signal to the EV, an eighth pin for receiving the charging permission signal from the EV, and a second fast terminal for supplying power to the EV. The first pin, second pin, third pin, fourth pin, and first fast terminal of the first charging device correspond to the fifth pin, sixth pin, seventh pin, eighth pin, and second fast terminal of the second charging device, respectively.

[0017] The aforementioned eighth pin may include an optocoupler. [Effects of the Invention]

[0018] According to an embodiment of the present invention, in the signaling process between an EVSE and an EV, a short circuit or an open circuit between the EVSE and the connection pins of the EV can be detected. In particular, according to an embodiment of the present invention, an open circuit, a ground short circuit, or a battery short circuit between the EVSE and the pin for transmitting a charging permission signal of the EV can be detected.

Brief Description of the Drawings

[0019] [Figure 1] It is a diagram showing a charging system for an electric vehicle according to an embodiment of the present invention. [Figure 2] It is a diagram showing a charging system for an electric vehicle according to an embodiment of the present invention. [Figure 3] It is a diagram showing a charging system for an electric vehicle according to an embodiment of the present invention.

[0020] [Figure 4] It is an example of a pinout of a connection part included in a charging device according to an embodiment of the present invention.

[0021] [Figure 5] It is an example of a charging interface between an EVSE and an EV according to an embodiment of the present invention.

[0022] [Figure 6] It is another example of a charging interface between an EVSE and an EV according to an embodiment of the present invention.

[0023] [Figure 7] It is a circuit diagram of an interface between an EVSE and a DCP pin among charging interfaces between an EVSE and an EV according to an embodiment of the present invention.

[0024] [Figure 8] It is a circuit diagram for simulating whether detection is possible for each type of failure between an EVSE and a DCP pin. [Modes for carrying out the invention]

[0025] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0026] However, the technical concept of the present invention is not limited to the embodiments described, and can be realized in a variety of different forms. Within the scope of the technical concept of the present invention, one or more components of the embodiments can be selectively combined and substituted for each other.

[0027] Furthermore, unless explicitly defined and described, terms used in embodiments of the present invention (including technical and scientific terms) can be interpreted as meanings generally understood by those skilled in the art to which the present invention pertains, and commonly used terms, such as those predefined, can be interpreted considering their meaning in the context of the relevant art.

[0028] Furthermore, the terminology used in the embodiments of the present invention is for illustrative purposes only and is not intended to limit the present invention.

[0029] In this specification, the singular form may include the plural form unless otherwise specified in the text, and when it is written as "A and at least one (or more) of B and C", it may include one or more of all possible combinations of A, B, and C.

[0030] Furthermore, when describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used.

[0031] Such terminology is merely used to distinguish one component from another, and is not limited by the nature, order, sequence, or anything else of that component.

[0032] Furthermore, when it is stated that one component is “linked,” “joined,” or “connected” to another component, this includes not only cases where the component is directly linked, joined, or connected to the other component, but also cases where it is “linked,” “joined,” or “connected” by another component that lies between it and the other component.

[0033] Furthermore, when it is stated that a component is formed or positioned "above or below" each component, "above or below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or positioned between two components. Also, when expressed as "above or below," it can include not only the upward direction but also the downward direction relative to one component.

[0034] The embodiments will be described in detail below with reference to the attached drawings. Regardless of the reference numerals, identical or corresponding components will be given the same reference numerals, and redundant descriptions thereof will be omitted.

[0035] Figures 1 to 3 show a charging system for an electric vehicle according to one embodiment of the present invention.

[0036] Referring to Figures 1 to 3, an electric vehicle (EV) 10 can be charged from an electric vehicle supply equipment (EVSE) 20. For this purpose, a charging cable 22 connected to the EVSE 20 can be connected to the inlet of the EV 10. Here, the EVSE 20 is equipment that supplies AC or DC power and may be located at a charging station or in a home, or it may be implemented in a portable manner. The EVSE 20 may be used in conjunction with a charging station (supply), AC station (AC supply), DC station (DC supply), socket outlet, etc.

[0037] The charging device 100 (Electric Vehicle Charging Controller, EVCC) is installed inside the EV10 and connected to the EV10. For example, the charging device 100 may, but is not limited to, be installed in the trunk of the EV10.

[0038] Here, the charging device 100 can communicate with EV10 and EVSE20, respectively.

[0039] According to embodiments of the present invention, the charging device 100 includes a charging control unit 110, a connection unit 120, and a detection unit 130.

[0040] The charging control unit 110 generates a control signal for charging between the EV10 and the EVSE20. The control signal for charging generated by the charging control unit 110 may be transmitted to the EVSE20 via the connection unit 120, or to the ECU12 in the EV10.

[0041] The connection unit 120 is connected to the EVSE 20 and transmits signals between the charge control unit 110 and the EVSE 20. For example, the connection unit 120 can transmit charge-related signals received from the EVSE 20 to the charge control unit 110, and transmit control signals for charging generated by the charge control unit 110 to the EVSE 20. Then, the connection unit 120 transmits the power received from the EVSE 20 to the battery 14 in the EV10 according to the control signals for charging generated by the charge control unit 110.

[0042] The detection unit 130 detects a diagnostic trouble code (DTC) between the EV10 and the EVSE20. The detection unit 130 is connected to the connection unit 120 and the charge control unit 110, respectively, and can transmit the DTC detected by the connection unit 120 to the charge control unit 110.

[0043] Figure 4 shows an example of a pinout of a connection part included in a charging device according to an embodiment of the present invention. The pinout shown in Figure 4 may be the shape seen from the end of the EV-side connector.

[0044] Referring to Figure 4, the connector 120 can include a total of 10 pins. For example, the connector 120 can include the FG pin, SS1 pin, SS2 pin, N / C pin, DCP pin, DC+ pin, DC- pin, PP pin, CH pin, and CL pin.

[0045] Here, the FG pin is the ground pin and can serve as a reference for the control line.

[0046] The SS1 and SS2 pins are pins that receive charge sequence signals from the EVSE20, respectively, and can provide load current to the EV10 side relay. The SS1 and SS2 pins may be referred to as charge start and stop pin 1 and charge start and stop pin 2, respectively, or charge sequence signal pin 1 and charge sequence signal pin 2.

[0047] N / C pins can be pins that are not connected.

[0048] The DCP pin is the pin that transmits a charge permission signal to the EVSE20 and may be referred to as the charge permission and prohibition pin or the vehicle charge permission pin.

[0049] The DC- and DC+ pins may be fast terminals for receiving power from the EVSE20.

[0050] The PP pin is the pin that receives the connector proximity detection signal of the EVSE20 and may be referred to as the connector connection verification pin or connector proximity detection pin. The PP pin may be used to verify the connection of the charging cable.

[0051] The CH and CL pins may be CAN buses that communicate with the EV bus to set operating parameters. If the PP pin confirms the connection of the charging cable, battery information from EV10 may be transferred to EVSE20 via the CH and CL pins, and information from EVSE20 may be transferred to EV10, allowing for compatibility checks between EV10 and EVSE20.

[0052] On the other hand, the end of the EVSE20 side connector can also have a shape that corresponds to the end of the EV10 side connector.

[0053] In other words, the end of the EVSE20 side connector may include a pin that transmits a first charging sequence signal to the EV10 and corresponds to the SS1 pin in Figure 4, a pin that transmits a second charging sequence signal to the EV10 and corresponds to the SS2 pin in Figure 4, a pin that transmits a connector proximity detection signal to the EV10 and corresponds to the PP pin in Figure 4, a pin that receives a charging permission signal from the EV10 and corresponds to the DCP pin in Figure 4, and a rapid terminal that supplies power to the EV10 and corresponds to the DC- and DC+ pins in Figure 4.

[0054] Furthermore, the end of the EVSE20 connector may further include a pin corresponding to at least one of the FG pin, N / C pin, CH pin, and CL pin shown in Figure 4.

[0055] Figure 5 shows an example of a charging interface between an EVSE and an EV according to one embodiment of the present invention. The charging interface between the EVSE and the EV can be a circuit diagram showing the end of the EV10-side connector connected to the end of the EVSE20-side connector.

[0056] Referring to Figure 5, when switch d1 is pressed on the EVSE20 side, a first charging sequence signal is sent from the EVSE20 to the EV10 via the SS1 pin, i.e., the charging start and stop 1 pin, which causes current to flow to the optocoupler f on the EV10 side.

[0057] Then, when switch d2 is pressed on the EVSE20 side, a second charging sequence signal is sent from the EVSE20 to the EV10 via the SS2 pin, i.e., the charging start stop 2 pin, which causes current to flow to the optocoupler g on the EV10 side.

[0058] When the EVSE20 transmits a connector proximity detection signal to the EV10 via the PP pin, or connector connection verification pin, current flows through the optocoupler h, allowing the EV10 to sense whether the connector is properly fastened or not.

[0059] Subsequently, when EV10 is prepared for charging and transistor k is pressed, a current path is formed while ground conduction is established, and a charge permission signal is sent to EVSE20 via the DCP pin, i.e., the charge permission and prohibition pin, causing current to flow to the optocoupler j on the EVSE20 side.

[0060] Once the transmission of the first charging sequence signal from EVSE20 to EV10, the transmission of the second charging sequence signal from EVSE20 to EV10, the transmission of the connector proximity detection signal from EVSE20 to EV10, and the transmission of the charging permission signal from EV10 to EVSE20 are complete, the battery relay on the EV10 side may be turned ON and charging may begin.

[0061] The order in which the first charging sequence signal is transmitted from EVSE20 to EV10, the second charging sequence signal is transmitted from EVSE20 to EV10, the connector proximity detection signal is transmitted from EVSE20 to EV10, and the charging permission signal is transmitted from EV10 to EVSE20 is not limited to this. For example, the transmission may occur in the following order: first charging sequence signal transmission from EVSE20 to EV10, connector proximity detection signal transmission from EVSE20 to EV10, charging permission signal transmission from EV10 to EVSE20, and second charging sequence signal transmission from EVSE20 to EV10.

[0062] The requirements for each component in the circuit diagram shown in Figure 5 are as shown in Table 1.

[0063] [Table 1]

[0064] Figure 6 shows another example of a charging interface between an EVSE and an EV according to one embodiment of the present invention. The charging interface between the EVSE and the EV may be a circuit diagram showing the end of the EV10-side connector connected to the end of the EVSE20-side connector.

[0065] Referring to Figure 6, when switch d1 is pressed on the EVSE20 side, the first charge sequence signal is sent from the EVSE20 to the EV10 via the SS1 pin, i.e., the charge sequence signal 1 pin, which causes current to flow to the optocoupler f on the EV side.

[0066] Then, when switch d2 is pressed on the EVSE20 side, a second charging sequence signal is sent from the EVSE20 to the EV10 via the SS2 pin, i.e., the charging sequence signal 2 pin, which causes current to flow to the optocoupler g on the EV10 side.

[0067] Then, when the EVSE20 transmits a connector proximity detection signal to the EV10 via the PP pin, or connector proximity detection pin, the EV10 can sense whether or not the connector is properly fastened.

[0068] Subsequently, when the EV10 is prepared for charging and transistor k is pressed, a current path is formed while the ground is connected, and a charge permission signal is sent to the EVSE20 via the DCP pin, i.e., the vehicle charge permission pin, causing current to flow to the optocoupler j on the EVSE20 side.

[0069] Once the transmission of the first charging sequence signal from EVSE20 to EV10, the transmission of the second charging sequence signal from EVSE20 to EV10, the transmission of the connector proximity detection signal from EVSE20 to EV10, and the transmission of the charging permission signal from EV10 to EVSE20 are complete, the battery relay on the EV10 side may be turned ON and charging may begin.

[0070] The order in which the first charging sequence signal is transmitted from EVSE20 to EV10, the second charging sequence signal is transmitted from EVSE20 to EV10, the connector proximity detection signal is transmitted from EVSE20 to EV10, and the charging permission signal is transmitted from EV10 to EVSE20 is not limited to this. For example, the transmission may occur in the following order: first charging sequence signal transmission from EVSE20 to EV10, connector proximity detection signal transmission from EVSE20 to EV10, charging permission signal transmission from EV10 to EVSE20, and second charging sequence signal transmission from EVSE20 to EV10.

[0071] The requirements for each EVSE-side component in the circuit diagram shown in Figure 6 are as shown in Table 2.

[0072] [Table 2]

[0073] The requirements for each EV-side component in the circuit diagram shown in Figure 6 are as shown in Table 3.

[0074] [Table 3]

[0075] On the other hand, according to an embodiment of the present invention, the detection unit 130 detects a diagnostic trouble code (DTC) between the EV10 and the EVSE20. In particular, during the charging sequence between the EVSE20 and the EV10, in the process in which a charging permission signal is transmitted from the EV10 to the EVSE20, there is a need to detect whether the connection state between the EVSE20 and the EV10 is normal, that is, to detect a short circuit or open circuit between the DCP pins of the EVSE20 and the EV10.

[0076] Figure 7 is a circuit diagram of the interface between the EVSE and the DCP pin, which is part of the charging interface between the EVSE and the EV according to one embodiment of the present invention.

[0077] Referring to Figure 7, the schematic diagram 700 of the interface between the EVSE and the DCP pin includes the EVSE side schematic 710 and the EV side schematic 720, which may be connected by a connection node N1. The connection node N1 may represent the contact between the end of the EVSE20 side connector and the DCP pin at the end of the EV10 side connector.

[0078] The EV side circuit diagram 720 includes a filter unit 721, a switch unit 722 connected to the filter unit 721, and a detection unit 723 connected to the switch unit 722.

[0079] According to an embodiment of the present invention, when charging is prepared on the EV10 side and the switch unit 722 is turned on, the ground is made conductive and a current path is formed, a charging permission signal is sent to the EVSE20, and as a result current flows to the optocoupler U1 on the EVSE20 side.

[0080] According to embodiments of the present invention, the filter unit 721 may be located between the connection node N1 between the EVSE side circuit diagram 710 and the EV side circuit diagram 720 and the switch unit 722. The filter unit 721 may include at least one of the following: an ESD (electrostatic discharge) filter, a surge filter, an EMC (electromagnetic compatibility) filter, and an EMI (electromagnetic interference) filter.

[0081] According to an embodiment of the present invention, the switch unit 722 is positioned between the filter unit 721 and the ground and includes a transistor k and a resistor R13. Here, the transistor k may be a configuration corresponding to the transistor k shown in Figure 5 and the transistor k shown in Figure 6. As shown in the figures, according to an embodiment of the present invention, the connection node N1, the filter unit 721, the transistor k, the resistor R13, and the ground may be arranged sequentially. For example, the connection node N1, the filter unit 721, the transistor k, the resistor R13, and the ground may be connected in series sequentially. In this case, the voltage Vce across the transistor k is set to 0.5V or less, and the resistor R13 may be set to a value of 3.5kΩ or less, preferably 190Ω to 210Ω, for example, 200Ω. As a result, when the EV10 side is prepared for charging and the transistor k is pressed, the ground conducts and a current path is formed, a charge permission signal is sent to the EVSE20, and as a result, current can flow to the optocoupler U1 on the EVSE20 side.

[0082] Table 4 shows the simulation results of the voltage values ​​read by the EV-side MCU in accordance with the EVSE-side voltage V1 and EVSE-side resistance R7 in the circuit diagram of Figure 7.

[0083] [Table 4]

[0084] Referring to Table 4, when the EVSE20 voltage V1 is 10.8V, and the EVSE20 resistor R7 is set between 0 and 20kΩ, the EV10 MCU reads a voltage value of 0.33V to 2.2V. This results in a forward current of 0.4mA to 10.6mA on the EVSE20 side, thus satisfying the requirement in Table 1, namely that the current flowing through the optocoupler j must be 50mA or less. Similarly, when the EVSE20 voltage V1 is 13.2V, and the EVSE20 resistor R7 is set between 0 and 20kΩ, the EV10 MCU reads a voltage value of 0.35V to 2.2V. This results in a forward current of 0.35mA to 10.7mA on the EVSE20 side, thus satisfying the requirement in Table 1, namely that the current flowing through the optocoupler j must be 50mA or less.

[0085] Furthermore, referring to Table 4, it can be seen that in both cases where the EVSE20 voltage V1 is 10.8V and EVSE20 voltage V1 is 13.2V, if the EVSE20 resistor R7 is set to 1kΩ, the voltage value is read by the EV10 MCU, thus satisfying the requirements of Tables 2 and 3.

[0086] Thus, according to the circuit diagram of the embodiment of the present invention, it can be seen that when EVSE20 and EV10 are properly connected, all the requirements of Tables 1 to 3 are met.

[0087] On the other hand, according to an embodiment of the present invention, the circuit diagram of the interface between the EVSE20 and the DCP pin, which is part of the charging interface between the EVSE20 and the EV10, further includes a detection unit 723 for detecting a DTC (diagnostic trouble code) between the EVSE20 and the DCP pin. The DTC between the EVSE20 and the DCP pin may be an open circuit or a short circuit between the EVSE20 and the DCP pin. According to an embodiment of the present invention, the detection unit 723 can detect at least one of the following: an open circuit between the EVSE and the DCP pin, a ground short circuit between the EVSE and the DCP pin, and a battery short circuit between the EVSE and the DCP pin. The detection unit 723 may be configured as shown in the detection unit 130 in Figure 3.

[0088] For this purpose, the resistor R13 of the switch unit 722 is placed between transistor k and ground, and the detection unit 723 can be connected to node N2 between transistor k and resistor R13. This allows the detection unit 723 to detect the voltage across resistor R13.

[0089] According to an embodiment of the present invention, the detection unit 723 may include an amplifier X1. In this case, the signal entering the input node N2 of the detection unit 723 may be amplified by the amplifier X1, thereby improving the accuracy of the detection.

[0090] According to an embodiment of the present invention, if 0V is read by the detection unit 723 while EVSE20 and EV10 are connected by a charging cable, it may indicate an open circuit between EVSE and the DCP pin or a short circuit to ground between EVSE and the DCP pin. Here, 0V does not necessarily mean a voltage of exactly 0V, but can mean a voltage within an error range. For example, if the voltage expected in a steady state is 2.2V, if a voltage within 20% of the expected voltage, preferably within 10% of the expected voltage, is read, it can be determined that there is an open circuit between EVSE and the DCP pin or a short circuit to ground between EVSE and the DCP pin. If a voltage exceeding 0V is read by the detection unit 723 while EVSE and EV are not connected by a charging cable, it may indicate a battery short circuit between EVSE and the DCP pin. Thus, the EV-side charging device according to an embodiment of the present invention can detect a DTC (Diagnostic trouble code) between EVSE and the DCP pin.

[0091] Figure 8 is a circuit diagram for simulating the detection of each fault type between the EVSE and DCP pins.

[0092] Referring to Figure 8, a fault type section 800 is further positioned between the EVSE-side circuit diagram 710 and the EV-side circuit diagram 720, which are interfaces through which a charging permission signal is transmitted from EV10 to EVSE20.

[0093] The fault type section 800 includes a first switch 801, a second switch 802, and a third switch 803.

[0094] When the first switch 801 is closed, it indicates a short to ground fault between the EVSE20 and the DCP pin; when the second switch 802 is open, it indicates an open fault between the EVSE20 and the DCP pin; and when the third switch 803 is closed, it indicates a short to battery fault between the EVSE20 and the DCP pin.

[0095] Table 5 shows the voltages read by the detection unit for each fault type when the EVSE20 and EV10 are connected by a charging cable and when they are not connected.

[0096] [Table 5]

[0097] Referring to Figure 8 and Table 5, if the EVSE20 voltage is 10.8V, the EVSE20 resistor R7 is set to 0Ω, the EVSE20 and EV10 are connected by a charging cable, and the connection between the EVSE20 and the DCP pin is in a steady state, then it is expected that the EV side detection unit 723 will read a voltage of 2.2V.

[0098] If, in the fault type section 800 of Figure 8, the first switch 801 is closed, the second switch 802 is closed, and the third switch 803 is open, that is, if there is a short-to-ground condition, the EV10 side detection unit 723 will read a voltage of 0V. Thus, while it is expected that the EV10 side detection unit 723 will read a voltage of 2.2V when the EVSE20 and EV10 are connected by a charging cable, if a voltage of 0V is read, it is possible to detect that there is a short-to-ground condition between the EVSE20 and the DCP pin.

[0099] Next, in the fault type section 800 of Figure 8, if the second switch 802 is open, i.e., in an open state, a voltage of 0V is read by the EV10 side detection unit 723. Thus, it is expected that a voltage of 2.2V will be read by the EV10 side detection unit 723 when the EVSE20 and EV10 are connected by the charging cable. However, if a voltage lower than 2.2V and close to 0V is read, it is possible to detect that there is an open state between the EVSE20 and the DCP pin.

[0100] However, in the fault type section 800 of Figure 8, if the first switch 801 is open, the second switch 802 is closed, and the third switch 803 is closed, i.e., if there is a short circuit to battery, the EV10 side detection unit 723 reads a voltage of 2.2V. This is because the voltage read by the EV10 side detection unit 723 is the same as when the connection between EVSE20 and the DCP pin is in a steady state while EVSE20 and EV10 are connected by a charging cable, making it difficult to detect a short circuit to battery between EVSE20 and the DCP pin.

[0101] On the other hand, if the EVSE20 voltage is 10.8V, the EVSE20 resistor R7 is set to 0Ω, and the EVSE20 and EV10 are not connected by a charging cable, it is expected that the EV10 detection unit 723 will read a voltage of 0V.

[0102] If, in the fault type section 800 of Figure 8, the first switch 801 is closed, the second switch 802 is closed, and the third switch 803 is open, that is, if there is a short-to-ground condition, the EV side detection unit 723 will read a voltage of 0V. This is the same as the voltage predicted by the EV10 side detection unit 723 when the EVSE20 and EV10 are not connected by a charging cable, making it difficult to detect the short-to-ground condition.

[0103] Next, in the fault type section 800 of Figure 8, if the second switch 802 is open, i.e., in an open state, a voltage of 0V is read by the EV10 side detection unit 723. Since this is the same as the voltage predicted by the EV10 side detection unit 723 when the EVSE20 and EV10 are not connected by a charging cable, it may be difficult to detect a short-circuit condition.

[0104] However, in the fault type section 800 of Figure 8, if the first switch 801 is open, the second switch 802 is closed, and the third switch 803 is closed, i.e., if there is a short-circuit condition, the EV10 side detection unit 723 reads a voltage of 2.2V. Thus, although it is expected that the EV10 side detection unit 723 will read a voltage of 0V when the EVSE20 and EV10 are not connected by a charging cable, if a voltage of 2.2V is read, it is possible to detect that there is a short-circuit condition.

[0105] As described above, according to the embodiment of the present invention, a Diagnostic Trouble Code (DTC) can be detected using the voltage read by the detection unit 723. That is, a DTC can be detected when a voltage different from the voltage expected to be read by the detection unit 723 is read when the EVSE20 and EV10 are connected by a charging cable or when they are not connected. For example, a short to ground and an open circuit can be detected using the voltage value read by the detection unit 723 when the EVSE20 and EV10 are connected by a charging cable, and a short to battery can be detected using the voltage value read by the detection unit 723 when the EVSE20 and EV10 are not connected by a charging cable.

[0106] While the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will understand that the present invention can be modified and altered in various ways without departing from the spirit and scope of the invention as set forth in the following claims. [Explanation of symbols]

[0107] 10: Electric vehicles

[0108] 20: Electric vehicle charging facilities

[0109] 22: Charging cable

[0110] 100: Charging device

[0111] 110: Charging control unit

[0112] 120: Connection part

[0113] 130: Detection unit

[0114] 710: EVSE side circuit diagram

[0115] 720: EV side circuit diagram

[0116] 721: Filter section

[0117] 722: Switch section

[0118] 723: Detection unit

[0119] 800: Fault Type Section

Claims

1. In electric vehicle charging devices, A charging control unit that generates a control signal for charging, A connection unit that is connected to an EVSE (Electric Vehicle Supply Equipment) and transmits power received from the EVSE to the battery in accordance with the control signal for charging, Includes a detection unit, The aforementioned connection part is A first pin that receives a first charging sequence signal from the EVSE, A second pin that receives a second charging sequence signal from the EVSE, The third pin of the EVSE receives the connector proximity detection signal, A fourth pin which transmits a charging permission signal to the EVSE, Includes a rapid terminal for receiving power from the EVSE, The detection unit is a charging device that detects a short circuit or open circuit between the EVSE and the fourth pin.

2. The charging device according to claim 1, wherein the detection unit detects at least one of the following: a disconnection between the EVSE and the fourth pin, a ground short circuit between the EVSE and the fourth pin, and a battery short circuit between the EVSE and the fourth pin.

3. The charging device according to claim 2, wherein a disconnection between the EVSE and the fourth pin and a ground short circuit between the EVSE and the fourth pin are detected when the EVSE and the connection part are connected, and a battery short circuit between the EVSE and the fourth pin is detected when the EVSE and the connection part are not connected.

4. The charging device according to claim 3, wherein when 0V is read by the detection unit while the EVSE and the connection part are connected, it indicates a disconnection between the EVSE and the fourth pin or a ground short circuit between the EVSE and the fourth pin, and when the EVSE and the connection part are not connected, it indicates a battery short circuit between the EVSE and the fourth pin.

5. The fourth pin further includes a transistor connected to the EVSE and a resistor placed between the transistor and ground. The charging device according to claim 3, wherein the detection unit is connected to the node between the transistor and the resistor.

6. The charging device according to claim 5, wherein the detection unit detects the voltage across the resistor.

7. The charging device according to claim 5, wherein the detection unit includes an amplifier.

8. The charging device according to claim 5, wherein the fourth pin further includes a filter disposed between the EVSE and the transistor.

9. The charging device according to claim 5, wherein the aforementioned resistance is 3.5 kΩ or less.

10. The charging device according to claim 5, wherein the maximum voltage across the transistor is 0.5V.

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