Communication control device of electric vehicle and charging control method thereof

Abstract

A communication control device of an electric vehicle, according to one embodiment of the present invention, comprises: a charge control unit for generating a control signal for charging; a connection unit connected to electric vehicle supply equipment (EVSE) and transmitting power received from the EVSE to a battery in response to the control signal for charging; and a detection unit. The connection unit comprises: a first line for receiving a first charge sequence signal from the EVSE; a second line for receiving a second charge sequence signal from the EVSE; a third line for receiving a connector proximity detection signal of the EVSE; a fourth line for transmitting a charge permission signal to the EVSE; and a rapid terminal for receiving power from the EVSE. The detection unit detects EVSE-side resistance, EVSE being connected to the fourth line, and voltage applied to the fourth line.

Description

Communication control device for electric vehicle and charging control method thereof

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

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

[0003] To charge an electric vehicle, the EV and EVSE communicate via a charging connector. Once the charging connector is connected, charging begins after signaling is performed between the EVSE and EV.

[0004] At this time, there is a need to detect shorts or open circuits between the EVSE and EV connection pins during the signaling process between the EVSE and EV. Furthermore, for efficient charging control, the communication control device mounted on the EV needs to detect the exact version of the EVSE.

[0005] The technical problem to be solved by the present invention is to provide a communication control device for charging an electric vehicle and a charging control method thereof.

[0006] According to one embodiment of the present invention, a communication control device for an electric vehicle includes a charging control unit that generates a control signal for charging, a connection unit that is connected to an Electric Vehicle Supply Equipment (EVSE) and transmits power received from the EVSE to a battery according to the control signal for charging, and a detection unit, wherein the connection unit includes a first line that receives a first charging sequence signal from the EVSE, a second line that receives a second charging sequence signal from the EVSE, a third line that receives a connector proximity detection signal of the EVSE, a fourth line 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 resistance of the EVSE connected to the fourth line and a voltage applied to the fourth line.

[0007] The detection unit includes a first detection unit that outputs a first voltage value, and the EVSE side resistance is detected using the first voltage value, and the EVSE side resistance can be between 0 ohm and 20 kOhm.

[0008] The charging control unit can estimate the standard version applied to the EVSE using the detected EVSE side resistance.

[0009] The standard version applicable to the above EVSE may be CHAdeMO 1.0 or CHAdeMO 0.9.1.

[0010] The above first detection unit may include a non-inverting operational amplifier.

[0011] The above first detection unit may further include a protection diode.

[0012] The detection unit further includes a second detection unit that outputs a second voltage value, and the voltage applied to the fourth line is detected using the EVSE side resistance and the second voltage value, and the voltage applied to the fourth line may be a DC voltage of 0 V to 25 V.

[0013] The charging control unit can detect a short circuit between the EVSE and the fourth line or a ground short circuit between the EVSE and the fourth line using the DC voltage.

[0014] If 0V is read in the second detection unit, there may be a short circuit between the EVSE and the fourth line or a ground short between the EVSE and the fourth line.

[0015] The second detection unit may include a voltage-dividing resistor unit and an operational amplifier connected to the voltage-dividing resistor unit.

[0016] The above operational amplifier may be a buffer amplifier.

[0017] It further includes a filter unit connected to the fourth line, and a switch unit disposed between the filter unit and the ground, and the detection unit can be connected between the filter unit and the switch unit.

[0018] A charging permission signal can be transmitted to the EVSE from the ground through the switch unit.

[0019] A charging control method of a communication control device for an electric vehicle according to an embodiment of the present invention includes the steps of connecting to an Electric Vehicle Supply Equipment (EVSE) and communicating with the EVSE, and generating a control signal for charging according to a result of communicating with the EVSE, wherein in the communicating step, a first charging sequence signal is received from the EVSE through a first line, a second charging sequence signal is received from the EVSE through a second line, a connector proximity detection signal of the EVSE is received through a third line, and a charging permission signal is received from the EVSE through a fourth line, and in the step of generating the control signal, a resistance of the EVSE connected to the fourth line is detected, and a voltage applied to the fourth line is detected.

[0020] In the step of generating the above control signal, the standard version applied to the EVSE can be estimated using the detected EVSE side resistance.

[0021] In the step of generating the above control signal, the voltage applied to the fourth line is detected using the detected EVSE side resistance, and the voltage applied to the fourth line may be a DC voltage of 0 V to 25 V.

[0022] In the step of generating the above control signal, a short circuit between the EVSE and the fourth line or a ground short circuit between the EVSE and the fourth line can be detected using the voltage applied to the detected fourth line.

[0023] The method may further include a step of controlling power received from the EVSE to be transferred to the battery according to the control signal for charging.

[0024] According to an embodiment of the present invention, a short circuit or disconnection between the connection pins of the EVSE and the EV can be detected during the signaling process between the EVSE and the EV. In particular, according to an embodiment of the present invention, a short circuit or ground short between the pins transmitting the charging permission signal between the EVSE and the EV can be detected. Furthermore, according to an embodiment of the present invention, the version of the EVSE connected to the communication control device of the EV can be detected.

[0025] Figures 1 to 3 are drawings showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0026] FIG. 4 is an example of a pinout of a connection part included in a communication control device according to an embodiment of the present invention.

[0027] FIG. 5 is an example of a charging interface between an EVSE and an EV according to one embodiment of the present invention.

[0028] FIG. 6 is another example of a charging interface between an EVSE and an EV according to one embodiment of the present invention.

[0029] FIG. 7 is a circuit diagram of an interface between an EVSE and a PERMISSION pin among charging interfaces between an EVSE and an EV according to one embodiment of the present invention.

[0030] FIG. 8 is a graph simulating the first detection unit of the circuit diagram of the interface between the EVSE and the PERMISSION pin illustrated in FIG. 7.

[0031] FIG. 9 is a graph simulating the second detection unit of the circuit diagram of the interface between the EVSE and the PERMISSION pins shown in FIG. 7.

[0032] Fig. 10 is a flowchart of a charging control method of a communication control device for an electric vehicle according to an embodiment of the present invention.

[0033] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0034] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0035] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0036] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0037] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0038] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0039] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0040] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0041] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0042] Hereinafter, embodiments will be described in detail with reference to the attached drawings. Regardless of the drawing numbers, identical or corresponding components are given the same reference numbers, and redundant descriptions thereof will be omitted.

[0043] Figures 1 to 3 are drawings showing a charging system for an electric vehicle according to one embodiment of the present invention.

[0044] Referring to FIGS. 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 an inlet of the EV (10). Here, the EVSE (20) is a device that supplies AC or DC, and can be placed at a charging station, placed at home, or implemented to be portable. The EVSE (20) can be used interchangeably with a charging station (supply), an AC charging station (AC supply), a DC charging station (DC supply), a socket-outlet, etc.

[0045] An electric vehicle communication controller (EVCC, 100) is mounted in an EV (10) and connected to the EV (10). For example, the communication control device (100) may be installed in the trunk of the EV (10), but is not limited thereto.

[0046] Here, the communication control device (100) can communicate with the EV (10) and EVSE (20), respectively.

[0047] In this specification, an EV (10) equipped with a communication control device (100) may be collectively referred to as an EV (10). Hereinafter, EV (10) may also refer to a communication control device (100) equipped in the EV (10). That is, communication between the EVSE (20) and the EV (10) may refer to communication between the EVSE (20) and the communication control device (100) equipped in the EV (10). In this specification, the communication control device (100) may also be referred to as a charging device.

[0048] According to an embodiment of the present invention, a communication control device (100) includes a charging control unit (110), a connection unit (120), and a detection unit (130).

[0049] The charging control unit (110) generates a control signal for charging between the EV (10) and the EVSE (20). The control signal for charging generated by the charging control unit (110) can be transmitted to the EVSE (20) through the connection unit (120) or to the ECU (12) in the EV (10).

[0050] The connection unit (120) is connected to the EVSE (20) and transmits signals between the charging control unit (110) and the EVSE (20). For example, the connection unit (120) may transmit a charging-related signal received from the EVSE (20) to the charging control unit (110) and transmit a control signal for charging generated by the charging control unit (110) to the EVSE (20). In addition, the connection unit (120) transmits power received from the EVSE (20) to the battery (14) in the EV (10) according to the control signal for charging generated by the charging control unit (110).

[0051] The detection unit (130) detects the connection between the EV (10) and the EVSE (20). The detection unit (130) is connected to the connection unit (120) and the charging control unit (110), respectively, and can transmit information detected from the connection unit (120) to the charging control unit (110). For example, the charging control unit (110) can diagnose a diagnostic trouble code (DTC) based on the information detected by the detection unit (130).

[0052] FIG. 4 is an example of a pinout connected to a connection part included in a communication control device according to an embodiment of the present invention. The pinout illustrated in FIG. 4 may be a shape shown at the end of an EV-side connector.

[0053] Referring to FIG. 4, the connection part (120) may include a total of 10 pins. For example, the connection part (120) may include an FG pin, an SS1 pin, an SS2 pin, an N / C pin, a DCP pin, a DC+ pin, a DC- pin, a PP pin, a CH pin, and a CL pin.

[0054] Here, the FG pin is a ground pin and can be a reference for the control line.

[0055] The SS1 pin and the SS2 pin are pins that receive a charge sequence signal from the EVSE (20), respectively, and can provide load current to a relay on the EV (10). The SS1 pin and the SS2 pin may be referred to as a charge start and stop 1 pin and a charge start and stop 2 pin, respectively, or as a charge sequence signal 1 pin and a charge sequence signal 2 pin.

[0056] The N / C pin may be a not connected pin.

[0057] The DCP pin is a pin that transmits a charging permission signal to the EVSE (20), and may be referred to as a charge permission and prohibition pin, a vehicle charge permission pin, or a PERMISSION pin.

[0058] The DC-pin and DC+ pin may be rapid terminals that receive power from the EVSE (20).

[0059] The PP pin is a pin that receives a connector proximity detection signal from the EVSE (20) and may be referred to as a verification of connector connection pin or a connector proximity detection pin. The PP pin may be a pin for verifying the connection of a charging cable.

[0060] The CH pin and CL pin may be CAN bus that communicates with the EV bus to set operating parameters. When the PP pin confirms the connection of the charging cable, battery information of the EV (10) is transmitted to the EVSE (20) through the CH pin and CL pin, information of the EVSE (20) is transmitted to the EV (10), and compatibility checks can be performed between the EV (10) and the EVSE (20).

[0061] In this specification, the SS1 pin may be referred to as the first line or the first pin, the SS2 pin may be referred to as the second line or the second pin, the PP pin may be referred to as the third line or the third pin, and the PERMISSION pin may be referred to as the fourth line or the fourth pin.

[0062] Meanwhile, the end of the EVSE (20) side connector may also have a shape corresponding to the end of the EV (10) side connector.

[0063] That is, the end of the connector on the EVSE (20) side may include a pin corresponding to the SS1 pin of FIG. 4 for transmitting a first charging sequence signal to the EV (10), a pin corresponding to the SS2 pin of FIG. 4 for transmitting a second charging sequence signal to the EV (10), a pin corresponding to the PP pin of FIG. 4 for transmitting a connector proximity detection signal to the EV (10), a pin corresponding to the PERMISSION pin of FIG. 4 for receiving a charging permission signal from the EV (10), and a rapid terminal corresponding to the DC- pin and DC+ pin of FIG. 4 for transmitting power to the EV (10).

[0064] Additionally, the end of the EVSE (20) side connector may further include a pin corresponding to at least one of the FG pin, N / C pin, CH pin, and CL pin of FIG. 4.

[0065] Fig. 5 is an example of a charging interface between an EVSE and an EV according to one embodiment of the present invention. The charging interface between an EVSE and an EV may be a circuit diagram in which an end of a connector on the EV (10) side and an end of a connector on the EVSE (20) side are connected.

[0066] Referring to FIG. 5, when switch d1 is pressed on the EVSE (20) side, a first charging sequence signal is transmitted from the EVSE (20) to the EV (10) through the SS1 pin, i.e., the charging start and stop 1 pin, and accordingly, current flows to the optocoupler f on the EV (10) side.

[0067] And, when switch d2 is pressed on the EVSE (20) side, a second charging sequence signal is transmitted from the EVSE (20) to the EV (10) through the SS2 pin, i.e., the charging start stop 2 pin, and accordingly, current flows to the optocoupler g on the EV (10) side.

[0068] When a connector proximity detection signal of the EVSE (20) is transmitted from the EVSE (20) to the EV (10) through the PP pin, i.e., the verification of connector connection pin, current flows to the optocoupler h, and thus the EV (10) can detect whether the connector is properly connected.

[0069] Afterwards, when charging is prepared on the EV (10) side and the transistor k is pressed, the ground is conducted and a current path is formed, and a charge permission signal is transmitted to the EVSE (20) through the charge permission and prohibition pin, and accordingly, current flows to the optocoupler j on the EVSE (20) side.

[0070] When the first charging sequence signal transmission from EVSE (20) to EV (10), the second charging sequence signal transmission from EVSE (20) to EV (10), the connector proximity detection signal transmission from EVSE (20) to EV (10), and the charging permission signal transmission from EV (10) to EVSE (20) are completed, the battery relay on the EV (10) side is turned ON so that charging can begin.

[0071] The order of transmitting a first charging sequence signal from EVSE (20) to EV (10), transmitting a second charging sequence signal from EVSE (20) to EV (10), transmitting a connector proximity detection signal from EVSE (20) to EV (10), and transmitting a charging permission signal from EV (10) to EVSE (20) is not limited thereto. For example, the order of transmitting a first charging sequence signal from EVSE (20) to EV (10), transmitting a connector proximity detection signal from EVSE (20) to EV (10), transmitting a charging permission signal from EV (10) to EVSE (20), and transmitting a second charging sequence signal from EVSE (20) to EV (10) may be performed.

[0072] The requirements for each component in the circuit diagram shown in Fig. 5 are as shown in Table 1.

[0073] Component Requirements Charge start and stop 1, 2 Rated 2AOptocoupler f, g 2 mA~Optocoupler h~50 mAOptocoupler j~50 mA

[0074] Fig. 6 is another example of a charging interface between an EVSE and an EV according to one embodiment of the present invention. The charging interface between an EVSE and an EV may be a circuit diagram in which an end of a connector on the EV (10) side and an end of a connector on the EVSE (20) side are connected.

[0075] Referring to Fig. 6, when switch d1 is pressed on the EVSE (20) side, a first charge sequence signal is transmitted from the EVSE (20) to the EV (10) through the SS1 pin, i.e., the charge sequence signal 1 pin, and accordingly, current flows to the EV side optocoupler f.

[0076] And, when switch d2 is pressed on the EVSE (20) side, a second charging sequence signal is transmitted from the EVSE (20) to the EV (10) through the SS2 pin, i.e., the charging sequence signal 2 pin, and accordingly, current flows to the optocoupler g on the EV (10) side.

[0077] And, when a connector proximity detection signal of the EVSE (20) is transmitted from the EVSE (20) to the EV (10) through the PP pin, i.e., the connector proximity detection pin, the EV (10) can detect whether the connector is properly connected.

[0078] Afterwards, when charging is prepared on the EV (10) side and the transistor k is pressed, the ground is connected and a current path is formed, and a charging permission signal is transmitted to the EVSE (20) through the vehicle charge permission pin, and accordingly, current flows to the optocoupler j on the EVSE (20) side.

[0079] When the first charging sequence signal transmission from EVSE (20) to EV (10), the second charging sequence signal transmission from EVSE (20) to EV (10), the connector proximity detection signal transmission from EVSE (20) to EV (10), and the charging permission signal transmission from EV (10) to EVSE (20) are completed, the battery relay on the EV (10) side is turned ON so that charging can begin.

[0080] The order of transmitting a first charging sequence signal from EVSE (20) to EV (10), transmitting a second charging sequence signal from EVSE (20) to EV (10), transmitting a connector proximity detection signal from EVSE (20) to EV (10), and transmitting a charging permission signal from EV (10) to EVSE (20) is not limited thereto. For example, the order of transmitting a first charging sequence signal from EVSE (20) to EV (10), transmitting a connector proximity detection signal from EVSE (20) to EV (10), transmitting a charging permission signal from EV (10) to EVSE (20), and transmitting a second charging sequence signal from EVSE (20) to EV (10) may be performed.

[0081] The requirements for each EVSE component in the circuit diagram shown in Fig. 6 are as shown in Table 2.

[0082] TerminalItemMinimum valueTypical valueMaximum valueUnitCharge sequence signal 1Charger DC12V10.812.013.2VConnector proximity detectionResistor R1190200210ΩVehicle charge permissionResistor R295010001050ΩCharge sequence signal 1Relay d1 load current22000mACharge sequence signal 2Relay d2 load current22000mA

[0083] The requirements for each EV-side component in the circuit diagram shown in Fig. 6 are as shown in Table 3.

[0084] TerminalItemMinimum valueTypical valueMaximum valueUnitCharge sequence signal 1Load current(when d1 ON)102000mACharge sequence signal 2Load current(when d1 an d2 ON)102000mAConnector proximity detectionResistor R395010001050ΩOn-board DC 12V81216VVehicle charge permissionResistor R4190200210ΩVehicle charge permissionLoad current (leakage current) between ab when switch k OFF2mAVce(collector-emitter voltage of transistor "k") at collector current=10mA0.5V

[0085] The charging interface between the EVSE and the EV according to FIG. 5 and the charging interface between the EVSE and the EV according to FIG. 6 may be charging interfaces conforming to the CHAdeMO standard. In particular, the charging interface between the EVSE and the EV according to FIG. 5 may be a charging interface conforming to CHAdeMO version 0.9.1, and the charging interface between the EVSE and the EV according to FIG. 6 may be a charging interface conforming to CHAdeMO version 1.0.

[0086] As described above, in the charging interface of FIG. 6 according to CHAdeMO version 1.0, the requirement for the EVSE (20) side resistance (R2) of the vehicle charge permission pin is 1 kΩ, and the requirement for the EV (10) side resistance (R4) is 200 Ω. In contrast, in the charging interface of FIG. 5 according to CHAdeMO version 0.9.1, the requirement for the EVSE (20) side resistance of the charge permission and prohibition pins is not specifically defined. For example, in the charging interface of FIG. 5 according to CHAdeMO version 0.9.1, the resistance of the EVSE (20) side of the charge permission and prohibition pins may be, but is not limited to, 3.5 kΩ.

[0087] The EV (10) may be connected to an EVSE (20) based on CHAdeMO version 0.9.1 or may be connected to an EVSE (20) based on CHAdeMO version 1.0. The operation of the communication control device (100) mounted on the EV (10) may vary depending on the standard version applied to the EVSE (20). Accordingly, there is a need for the communication control device (100) to detect the standard version applied to the EVSE (20) connected to the EV (10).

[0088] Meanwhile, the communication control device (100) has a need to detect a DTC (diagnostic trouble code) between the EV (10) and the EVSE (20). For example, during the charging sequence between the EVSE (20) and the EV (10), when a charging permission signal is transmitted from the EV (10) to the EVSE (20), there is a need to detect whether the connection between the EVSE (20) and the EV (10) is normal or not, that is, during the transmission of the charging permission signal between the EVSE (20) and the EV (10), there is a need to detect a battery short circuit, a ground short circuit, or a short circuit.

[0089] Hereinafter, for convenience of explanation, the charge permission and prohibition pins in the charging interface of FIG. 5 and the vehicle charge permission pin in the charging interface of FIG. 6 may all be referred to as the PERMISSION pin, the fourth line, or the fourth pin.

[0090] According to an embodiment of the present invention, a diagnostic trouble code (DTC) between an EV (10) and an EVSE (20) is detected using a voltage applied to a vehicle charging permission pin. To this end, the resistance of the vehicle charging permission pin on the EVSE (20) side is detected to estimate the standard version applied to the EVSE (20), and a diagnostic trouble code (DTC) is detected more precisely according to the standard version applied to the EVSE (20).

[0091] FIG. 7 is a circuit diagram of an interface between an EVSE and a PERMISSION pin among charging interfaces between an EVSE and an EV according to one embodiment of the present invention.

[0092] Referring to Fig. 7, the circuit diagram (700) of the interface between the EVSE and the PERMISSION pin includes an EVSE-side circuit diagram (710) and an EV-side circuit diagram (720), and the EVSE-side circuit diagram (710) and the EV-side circuit diagram (720) can be connected at a connection node (N1). The connection node (N1) can mean a contact point between an end of an EVSE (20)-side connector and an end of an EV (10)-side connector.

[0093] 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).

[0094] According to an embodiment of the present invention, when charging is prepared on the EV (10) side and the switch unit (722) is turned on, the ground is connected, a current path is formed, and a charging permission signal is transmitted to the EVSE (20), and accordingly, current flows to the optocoupler U1 on the EVSE (20) side.

[0095] According to an embodiment of the present invention, a filter unit (721) may be placed between a connection node (N1) between an EVSE-side circuit diagram (710) and an EV-side circuit diagram (720) and a switch unit (722). The filter unit (721) may include at least one of an electrostatic discharge (ESD) filter, a surge filter, an electromagnetic compatibility (EMC) filter, and an electromagnetic interference (EMI) filter.

[0096] According to an embodiment of the present invention, the switch unit (722) is disposed between the filter unit (721) and the ground, and includes a resistor R13 and a transistor k. Here, the resistor R13 may have a configuration corresponding to the resistor R4 illustrated in FIG. 6, and the transistor k may have a configuration corresponding to the transistor k illustrated in FIG. 5 and the transistor k illustrated in FIG. 6. As illustrated, according to an embodiment of the present invention, the connection node (N1), the filter unit (721), the resistor R13, the transistor k, and the ground may be sequentially disposed. For example, the connection node (N1), the filter unit (721), the resistor R13, the transistor k, and the ground may be sequentially connected in series. At this time, the voltage Vce applied across the two terminals of the transistor k is set to 0.5 V or less, and the resistor R13 may be set to a value of 3.5 kΩ or less, preferably 190Ω to 210Ω, for example, 200Ω. Accordingly, when charging is prepared on the EV (10) side and the transistor k is pressed, the ground is conducted and a current path is formed, and a charging permission signal is transmitted to the EVSE (20), and thus current can flow to the optocoupler U1 on the EVSE (20) side.

[0097] Meanwhile, according to an embodiment of the present invention, the circuit diagram of the interface between the EVSE (20) and the PERMISSION pin among the charging interfaces between the EVSE (20) and the EV (10) further includes a detection unit (723) that detects the EVSE (20) side resistance connected to the PERMISSION pin and the voltage applied to the PERMISSION pin. The standard version applied to the EVSE (20) can be estimated by the EVSE (20) side resistance R12 detected by the detection unit (723). For example, when the EVSE (20) side resistance R12 is 1 kΩ, the standard version applied to the EVSE (20) may be CHAdeMO 1.0, and when the EVSE (20) side resistance R12 is a value other than 1 kΩ, the standard version applied to the EVSE (20) may be CHAdeMO 0.9.1. Additionally, a diagnostic trouble code (DTC) can be detected by the voltage applied to the PERMISSION pin detected by the detection unit (723). The DTC between the EVSE (20) and the PERMISSION pin may be a disconnection or a short circuit between the EVSE (20) and the PERMISSION pin, and specifically, may be one of a disconnection between the EVSE and the PERMISSION pin, a ground short circuit between the EVSE and the PERMISSION pin, and a battery short circuit between the EVSE and the PERMISSION pin.

[0098] For this purpose, the detection unit (723) can be connected to the node (N2) between the filter unit (721) and the switch unit (722).

[0099] According to an embodiment of the present invention, the detection unit (723) may include a first detection unit (810) and a second detection unit (820).

[0100] The first detection unit (810) is connected to the node (N2) between the filter unit (721) and the switch unit (722), outputs a first voltage value, and the EVSE (20) side resistance R12 can be detected using the first voltage value detected by the first detection unit (810). The detected EVSE (20) side resistance R12 can be 0Ω to 20kΩ, for example, more than 0Ω to 20kΩ or less. Here, the EVSE (20) side resistance R12 can mean the EVSE side resistance illustrated in FIG. 5 or the EVSE side resistance R2 illustrated in FIG. 6.

[0101] For this purpose, the first detection unit (810) includes an operational amplifier (OP Amp, X1). The operational amplifier (X1) included in the first detection unit (810) may be a non-inverting amplifier. Resistors R3 and R4 may be set so that the closed-loop voltage gain of the operational amplifier (X1) becomes approximately 2, for example, 2±0.2. In this way, when the closed-loop voltage gain of the operational amplifier (X1) becomes approximately 2, the change in the resistance value on the EVSE (20) side can be precisely detected. The first detection unit (810) outputs a first voltage value, and the MCU connected to the first detection unit (810) can estimate the resistance R12 on the EVSE (20) side from the first voltage value using a pre-stored table. Here, the MCU may be a part of the charging control unit (110) of FIG. 3.

[0102] Table 4 is an example of a table pre-stored in the MCU regarding the relationship between the first voltage value and the EVSE (20) side resistor R12.

[0103] EVSE side voltage V110.8V13.2VEVSE side resistance R12EVSE side forward current (mA)Voltage value (V) read by the MCU connected to the first detection unit (810)EVSE side forward current (mA)Voltage value (V) read by the EV side MCUShort to battery-4.99-4.99045.34.9957.114.991kΩ7.732.729.73.423.5kΩ2.530.893.171.125kΩ1.80.642.260.810kΩ0.920.321.150.4115kΩ0.620.220.770.2720kΩ0.460.170.580.21Open-0-0Short to ground-0-0

[0104] Referring to Table 4, for each case where the EVSE (20) voltage V1 is 10.8 V and the EVSE (20) voltage V1 is 13.2 V, the MCU connected to the first detection unit (810) stores the EVSE (20) side resistor R12 corresponding to the read voltage value. When the EVSE (20) voltage V1 is 10.8 V and the voltage value read by the MCU connected by the first detection unit (810) is 0.89 V, the EVSE (20) side resistor R12 can be estimated to be 3.5 kΩ, and accordingly, it can be seen that the standard applied to the EVSE (20) is CHAdeMO version 0.9.1. Likewise, if the voltage V1 of the EVSE (20) is 10.8 V and the voltage value read by the MCU connected by the first detection unit (810) is 2.72 V, the resistance R12 on the EVSE (20) side can be estimated to be 1 kΩ, and accordingly, it can be seen that the standard applied to the EVSE (20) is CHAdeMO version 1.0.

[0105] Meanwhile, referring to Table 4, regardless of the standard version to which the EVSE (20) is applied, if the forward current on the EVSE (20) side is not read and the voltage value read by the MCU connected to the first detection unit (810) is 4.99 V, it can be diagnosed as a short to battery. Alternatively, regardless of the standard version to which the EVSE (20) is applied, if the voltage value read by the MCU connected to the first detection unit (810) is 0 V, it can be diagnosed as a short to ground or open.

[0106] According to an embodiment of the present invention, due to the voltage generated from the EVSE (20), high energy may be applied from the EVSE (20), which may have a negative effect on the EMC (electromagnetic compatibility) performance of the EV (10). Accordingly, the first detection unit (810) may further include a protection diode (D1). The protection diode (D1) is arranged between the node (N2) between the filter unit (731) and the switch unit (732) and the input terminal (+) of the operational amplifier (X1), and may be connected to the ground.

[0107] Meanwhile, the second detection unit (820) is connected to the node (N2) between the filter unit (721) and the switch unit (722), outputs a second voltage value, and the voltage applied to the PERMISSION pin can be detected using the second voltage value detected by the second detection unit (820). The voltage applied to the PERMISSION pin can be a DC voltage of 0 V to 25 V, i.e., a DC voltage of 0 V or more and 25 V or less.

[0108] To this end, the second detection unit (820) includes a voltage-dividing resistor unit and an operational amplifier (OP Amp, X2). Here, the voltage-dividing resistor unit is arranged between the node (N2) and the operational amplifier (X2) to distribute the voltage input to the operational amplifier (X2). For example, the voltage-dividing resistor unit includes a first resistor (Ra) and a second resistor (Rb), one end of the first resistor (Ra) may be connected to the node (N2), and the other end of the first resistor (Ra) may be connected to one end of the second resistor (Rb) and the operational amplifier (X2). At this time, the first resistor (Ra) may be 100 kΩ or more, preferably 100 kΩ or more and 1000 kΩ or less, and more preferably 100 kΩ or more and 500 kΩ or less. In this way, if the first resistance (Ra) of the voltage distribution resistor is designed to be 100 kΩ or more, a structure capable of detecting an accurate voltage value without electrically affecting the surrounding circuit can be obtained.

[0109] The operational amplifier (X2) included in the second detection unit (820) may be a buffer amplifier. The second detection unit (820) outputs a second voltage value, and the MCU connected to the second detection unit (820) can estimate the voltage applied to the PERMISSION pin from the second voltage value using a pre-stored table. Here, the MCU may be a part of the charging control unit (110) of FIG. 3.

[0110] For example, a table pre-stored in the MCU connected to the second detection unit (820) may store a voltage applied to the PERMISSION pin corresponding to a voltage value read by the MCU connected to the second detection unit (820) according to a standard applicable to the EVSE (20). Alternatively, a table pre-stored in the MCU connected to the second detection unit (820) may store a voltage applied to the PERMISSION pin corresponding to a voltage value read by the MCU connected to the second detection unit (820) according to the resistor R12 on the EVSE (20).

[0111] Table 5 is an example of a table pre-stored in the MCU regarding the relationship between the second voltage value and the voltage applied to the PERMISSION pin when the CHAdeMO standard applied to the EVSE (20) is version 1.0.

[0112] Voltage (V) applied to the PERMISSION pin Second voltage value (V) read by the MCU connected to the second detection unit (820) Open / short to ground 0 5 0.96 10 1.93 15 2.92 0 3.87 25 4.83

[0113] Referring to Table 5, if the CHAdeMO standard applied to the EVSE (20) is version 1.0, that is, if the resistance R12 on the EVSE (20) side is estimated to be 1 kΩ by the first detection unit (810), the voltage applied to the PERMISSION pin can be detected using the second voltage value read by the MCU connected to the second detection unit (820). That is, the voltage applied to the PERMISSION pin can be detected using the resistance R12 on the EVSE (20) side estimated from the value detected by the first detection unit (810) and the second voltage value detected by the second detection unit (820). At this time, if the second voltage value read by the MCU connected to the second detection unit (820) is 0 V, it can be determined that there is a short circuit between the EVSE (20) and the PERMISSION pin or a ground short circuit between the EVSE (20) and the PERMISSION pin.

[0114] FIG. 8 is a graph simulating the first detection unit of the circuit diagram of the interface between the EVSE and the PERMISSION pins illustrated in FIG. 7, and FIG. 9 is a graph simulating the second detection unit of the circuit diagram of the interface between the EVSE and the PERMISSION pins illustrated in FIG. 7.

[0115] Referring to Fig. 8, the horizontal axis represents the resistance R12 on the EVSE (20) side, and the vertical axis represents the first voltage value output from the first detection unit (810). By varying the resistance R12 on the EVSE (20) side between 0 and 20 kΩ, a first voltage value as shown in the graph of Fig. 8 can be obtained. From this, the resistance R12 on the EVSE (20) side can be estimated from the first voltage value output from the first detection unit (810), and accordingly, the standard version applied to the EVSE (20) can be known.

[0116] Referring to Fig. 9, the horizontal axis is the voltage value applied to the PERMISSION pin, and the vertical axis is the second voltage value output from the second detection unit (820). By changing the voltage applied to the PERMISSION pin between 0 and 25 V, a second voltage value as in the graph of Fig. 9 can be obtained. By using the standard version applied to the EVSE (20) estimated by the first voltage value output from the first detection unit (810) and the second voltage value output from the second detection unit (820), the voltage applied to the PERMISSION pin can be estimated, and accordingly, it can be seen that a battery short circuit, a ground short circuit, a short circuit, etc. between the EVSE (20) and the EV (10) can be diagnosed.

[0117] Fig. 10 is a flowchart of a charging control method of a communication control device for an electric vehicle according to an embodiment of the present invention.

[0118] Referring to FIG. 10, a communication control device (100) is connected to an EVSE (Electric Vehicle Supply Equipment) and communicates with the EVSE (S1000). Here, a first charging sequence signal is received from the EVSE through a first line, a second charging sequence signal is received from the EVSE through a second line, a connector proximity detection signal of the EVSE is received through a third line, and a charging permission signal is received from the EVSE through a fourth line.

[0119] Next, the communication control device (100) generates a control signal for charging based on the result of communication with the EVSE (S1010). Here, the communication control device (100) detects the resistance of the EVSE connected to the fourth line and detects the voltage applied to the fourth line.

[0120] In the step of generating a control signal, the communication control device (100) can estimate the standard version applied to the EVSE using the detected EVSE side resistance.

[0121] In the step of generating a control signal, the communication control device (100) detects the voltage applied to the fourth line using the detected EVSE side resistance, and the voltage applied to the fourth line may be a DC voltage of 0 V to 25 V.

[0122] In the step of generating a control signal, the communication control device (100) can detect a short circuit between the EVSE and the fourth line or a ground short circuit between the EVSE and the fourth line using the voltage applied to the detected fourth line.

[0123] Although not shown, the charging control method according to an embodiment of the present invention may further include a step of controlling power received from the EVSE to be transferred to the battery according to a control signal for charging.

[0124] Although the present invention has been described above with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below.

[0125] [Explanation of symbols]

[0126] 10: Electric cars

[0127] 20: Electric vehicle charging facilities

[0128] 22: Charging cable

[0129] 100: Communication control device

[0130] 110: Charging control unit

[0131] 120: Connection

[0132] 130: Detection unit

[0133] 710: EVSE side circuit diagram

[0134] 720: EV side circuit diagram

[0135] 721: Filter section

[0136] 722: Switch section

[0137] 723: Detection Unit

[0138] 810: First detection unit

[0139] 820: Second detection unit

Claims

1. In a communication control device of an electric vehicle, A charging control unit that generates a control signal for charging, A connection part that is connected to the EVSE (Electric Vehicle Supply Equipment) and transmits the power received from the EVSE to the battery according to the control signal for charging, and Including a detection unit, The above connection part, A first line receiving a first charging sequence signal from the EVSE; A second line receiving a second charging sequence signal from the EVSE; A third line for receiving a connector proximity detection signal of the above EVSE, A fourth line for transmitting a charging permission signal to the above EVSE, and Includes a rapid terminal that receives power from the EVSE, The above detection unit is a communication control device that detects the EVSE side resistance connected to the fourth line and the voltage applied to the fourth line.

2. In paragraph 1, The above detection unit includes a first detection unit that outputs a first voltage value, The above EVSE side resistance is detected using the first voltage value, A communication control device having the above EVSE side resistance between 0 ohm and 20 kOhm.

3. In paragraph 2, The charging control unit is a communication control device that estimates the standard version applied to the EVSE by using the detected EVSE side resistance.

4. In paragraph 2, The above detection unit further includes a second detection unit that outputs a second voltage value, The voltage applied to the fourth line is detected using the EVSE side resistance and the second voltage value, A communication control device in which the voltage applied to the fourth line is a DC voltage of 0 V to 25 V.

5. In paragraph 4, The charging control unit is a communication control device that detects a short circuit between the EVSE and the fourth line or a ground short circuit between the EVSE and the fourth line using the DC voltage.

6. In paragraph 5, A communication control device that is a short circuit between the EVSE and the fourth line or a ground short circuit between the EVSE and the fourth line when 0V is read in the second detection unit.

7. In paragraph 4, The second detection unit is a communication control device including a voltage distribution resistor and an operational amplifier connected to the voltage distribution resistor.

8. In a charging control method of a communication control device for an electric vehicle, A step of connecting to EVSE (Electric Vehicle Supply Equipment) and communicating with the EVSE, and A step of generating a control signal for charging based on the result of communication with the EVSE is included. In the above communicating step, a first charging sequence signal is received from the EVSE through a first line, a second charging sequence signal is received from the EVSE through a second line, a connector proximity detection signal of the EVSE is received through a third line, and a charging permission signal is received from the EVSE through a fourth line. A charging control method for detecting the EVSE side resistance connected to the fourth line and detecting the voltage applied to the fourth line in the step of generating the control signal.

9. In paragraph 8, A charging control method for estimating a standard version applied to the EVSE by using the detected EVSE side resistance in the step of generating the above control signal.

10. In paragraph 8, In the step of generating the above control signal, the voltage applied to the fourth line is detected using the detected EVSE side resistance, A charging control method wherein the voltage applied to the fourth line is a DC voltage of 0 V to 25 V.

Images