Electric vehicle charging controller and electric vehicle charger including the same

Abstract

An electric vehicle charger includes: an inlet including first to sixth signal pins configured to be connected to first to sixth signal lines, respectively; and a sensing unit connected to the electric vehicle power supply device through a third signal line and a fourth signal line to receive the third signal and the fourth signal; wherein the sensing unit includes: a first processing unit configured to receive the third signal and the fourth signal from the electric vehicle power supply device through the third signal line and the fourth signal line; a second processing unit configured to receive the third signal and the fourth signal from the first processing unit and transmit the third signal and the fourth signal to a control unit; and an insulation unit configured to electrically isolate the first processing unit from the second processing unit.

Description

This application is a divisional application of the Chinese patent application with application number 202180021267.7. Technical Field

[0001] Embodiments relate to an electric vehicle charging controller and an electric vehicle charger including the electric vehicle charging controller. Background Art

[0002] An environmentally friendly vehicle such as an electric vehicle (EV) or a plug-in hybrid electric vehicle (PHEV) charges a battery using electric vehicle supply equipment (EVSE) installed at a power source.

[0003] To this end, an electric vehicle charging controller (EVCC) is installed in the EV, communicates with the EV and the EVSE, and controls charging of the EV.

[0004] For example, when the EVCC receives a signal from the EV indicating to start charging, the EVCC may control the start of charging, and when the EVCC receives a signal from the EV indicating to end charging, the EVCC may control the end of charging.

[0005] According to the charging time, the charging method of EV can be classified into fast charging and slow charging. In the case of fast charging, the battery is charged by direct current (DC) supplied from the charger, and in the case of slow charging, the battery is charged by alternating current (AC) supplied to the charger. Therefore, the charger for fast charging is called a fast charger or a DC charger, and the charger for slow charging is called a slow charger or an AC charger.

[0006] Since the electric vehicle charging system uses high voltage power, there are various processes to improve safety. For example, even when some connection pins are not connected by detecting whether the connector and the inlet are close to each other (coupled with each other), the charging process is not performed. In particular, equipotential bonding between EVSE and EV is a very important safety issue.

[0007] However, since the conventional electric vehicle charging system only determines whether the connector and the inlet are close to each other but has no method of determining whether the ground line is connected between the EVSE and the EV, a method is needed for this. Summary of the invention Technical issues

[0008] An embodiment is directed to providing an electric vehicle charging controller and an electric vehicle charger including the electric vehicle charging controller, which can determine whether a ground line is connected between an electric vehicle power supply equipment and an electric vehicle.

[0009] The purpose of the embodiment is not limited thereto, and may also include a purpose or effect that can be identified from a configuration or an embodiment to be described below. Technical Solution

[0010] The electric vehicle charger according to an embodiment of the present invention includes an electric vehicle charging controller, which includes: an inlet, the inlet includes a ground pin, a first signal pin and a second signal pin, the ground pin is coupled to a coupler and is configured to connect a first ground line and a second ground line, the first ground line is connected to a first ground power supply at an electric vehicle power supply device, the second ground line is connected to a second ground power supply at an electric vehicle, the first signal pin is coupled to a coupler and is configured to connect a first signal line at the electric vehicle power supply device and a first signal line at the electric vehicle, the second signal pin is coupled to a coupler and is configured to connect a second signal line at the electric vehicle power supply device and a second signal line at the electric vehicle; and a sensing unit, through a third The signal line and the fourth signal line are connected to the electric vehicle power supply equipment to receive the third signal and the fourth signal; wherein the entrance includes a signal unit, which is arranged between the second signal line and the third signal line, and is configured to generate a second signal and transmit the second signal to the electric vehicle charging controller, and the sensing unit includes: a first processing unit, which is electrically connected to the electric vehicle power supply equipment through the third signal line and the fourth signal line, and is configured to receive the third signal and the fourth signal from the electric vehicle power supply equipment; a second processing unit, which is configured to receive the third signal and the fourth signal that have been received by the first processing unit, and transmit the third signal and the fourth signal to the control unit; and an insulating unit, which is configured to electrically isolate the first processing unit from the second processing unit.

[0011] The insulating unit may convert the third and fourth signals received from the first processing unit from electrical signals into optical signals and then convert the third and fourth signals from optical signals into electrical signals to transmit the converted third and fourth signals to the second processing unit.

[0012] The insulating unit may be electrically connected to a second ground power source.

[0013] The insulating unit may include a photocoupler.

[0014] The first processing unit may include: a first diode configured to control the voltage amplitude of the third signal received through the third signal line to a preset value or less; a second diode configured to block a reverse voltage applied to the electric vehicle power supply equipment through the third signal line; and a third diode configured to block a reverse voltage applied to the electric vehicle charging controller through the fourth signal line.

[0015] The signal unit may include a first resistor having a first end connected to the third signal line and a second end connected to the second signal line.

[0016] The coupler may include a second resistor having a first end connected to the second signal line and a second end connected to the ground line, and when the first ground line and the second ground line are connected, a current passing through the first resistor and the second resistor may be generated.

[0017] The coupler may include a third resistor having a first end connected to the ground line and a second end connected to the first signal line, the input may include a fourth resistor having a first end connected to the first signal line and a second end connected to the ground line, and when the first ground line and the second ground line are disconnected, the control unit may generate a current through the first resistor to the fourth resistor.

[0018] When the voltage amplitude of the second signal is greater than the first voltage value and less than or equal to the second voltage value, the control unit may determine that the first ground line is connected to the second ground line.

[0019] When the voltage amplitude of the second signal is greater than the second voltage value and less than the third voltage value, the control unit may determine that the ground line at the electric vehicle supply equipment and the ground line at the electric vehicle are not connected.

[0020] The electric vehicle charging controller according to an embodiment of the present invention includes a sensing unit, which has a third signal line and a fourth signal line connected to the electric vehicle power supply device through an inlet and is configured to receive the third signal and the fourth signal, wherein the sensing unit includes: a first processing unit, which is electrically connected to the electric vehicle power supply device through the third signal line and the fourth signal line, and is configured to receive the third signal and the fourth signal from the electric vehicle power supply device; a second processing unit, which is configured to receive the third signal and the fourth signal received by the first processing unit, and transmit the third signal and the fourth signal to the control unit; and an insulating unit, which is configured to electrically isolate the first processing unit from the second processing unit, and the inlet It includes: a ground pin, coupled to a coupler and configured to connect a first ground line and a second ground line, the first ground line is connected to a first ground power supply at an electric vehicle power supply device, and the second ground line is connected to a second ground power supply at an electric vehicle; a first signal pin, coupled to the coupler and configured to connect a first signal line at the electric vehicle power supply device and a first signal line at the electric vehicle; a second signal pin, coupled to the coupler and configured to connect a second signal line at the electric vehicle power supply device and a second signal line at the electric vehicle; and a signal unit, arranged between the second signal line and the third signal line, and configured to generate a second signal and transmit the second signal to an electric vehicle charging controller.

[0021] The signal unit may include a first resistor having a first end connected to the third signal line and a second end connected to the second signal line.

[0022] The coupler may include a second resistor having a first end connected to the second signal line and a second end connected to the ground line, and when the first ground line and the second ground line are connected, a current passing through the first resistor and the second resistor may be generated.

[0023] The coupler may include a third resistor having a first end connected to the ground line and a second end connected to the first signal line; the input may include a fourth resistor having a first end connected to the first signal line and a second end connected to the ground line, and when the first ground line and the second ground line are disconnected, the control unit may generate a current through the first resistor to the fourth resistor. Beneficial Effects

[0024] According to an embodiment, it may be determined whether a ground line is disconnected in an electric vehicle charging system.

[0025] Various advantages and effects of the present invention are not limited to the above contents and will be more easily understood in the course of describing specific embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a view for describing an electric vehicle charging system according to an embodiment of the present invention.

[0027] Figure 2 is a view showing a configuration of an electric vehicle charging system according to an embodiment of the present invention.

[0028] Figure 3 : is a view showing a circuit configuration of an electric vehicle charging system according to an embodiment of the present invention.

[0029] Figure 4 is a view showing a circuit configuration of an electric vehicle charging system according to another embodiment of the present invention.

[0030] Figure 5 and Figure 6 It is used to describe the detection Figure 4 A view of the process of a ground wire disconnection state in an electric vehicle charging system.

[0031] Figure 7 is a view schematically showing an electric vehicle charging system according to an embodiment of the present invention.

[0032] Figure 8 is a view showing a circuit configuration of a sensing unit according to an embodiment of the present invention.

[0033] Fig. 9 and Fig.10 is a view for describing a configuration of a closed loop when a first ground line and a second ground line are connected according to an embodiment of the present invention.

[0034] Fig.11 is used to describe Fig. 9 and Fig.10 A view of a sensing signal received in a control unit.

[0035] Fig.12 and Fig.13 is a view for describing a configuration of a closed loop when a first ground line (PE) and a second ground line (PE) according to an embodiment of the present invention are disconnected.

[0036] Fig.14 is used to describe Fig.12 and Fig.13 A view of a sensing signal received in a control unit. DETAILED DESCRIPTION Best Mode

[0037] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0038] However, the technical spirit of the present invention is not limited to some of the described embodiments and may be implemented in various forms, and one or more of the components may be used by selective combination or replacement without departing from the scope of the technical spirit of the present invention.

[0039] In addition, unless clearly and specifically defined and described, the terms (including technical terms or scientific terms) used in the embodiments of the present invention may be interpreted as having the same meaning as can be generally understood by technicians in the field to which the present invention belongs, and general terms such as terms defined in dictionaries may be interpreted as meanings in the context of considering the relevant technology.

[0040] Furthermore, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

[0041] In this specification, unless otherwise specified in the phrase, the singular form may also include the plural form, and when described as "at least one (or one or more) of A, B and C", it may include one or more of all possible combinations of A, B and C.

[0042] Furthermore, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used.

[0043] These terms are only intended to distinguish the component from other components, and these terms do not limit the nature, order or sequence of the corresponding components.

[0044] In addition, when a component is described as being “connected,” “coupled” or “coupled” to another component, it may include a case where the component is not only directly connected, coupled or coupled to another component, but also a case where the component is “connected,” “coupled” or “coupled” to another component with other components interposed therebetween.

[0045] Furthermore, when described as being formed or disposed “on (above)” or “below (below)” of each component, “on (above)” or “below (below)” includes not only a case where two components are in direct contact with each other, but also a case where one or more other components are formed or disposed between the two components. Furthermore, when expressed as “top (above) or bottom (below)”, not only an upward direction relative to a component but also a downward direction relative to a component may be included.

[0046] Figure 1 is a view for describing an electric vehicle charging system according to an embodiment of the present invention.

[0047] The electric vehicle charging system according to an embodiment of the present invention may refer to a system for charging a battery of an electric vehicle that operates using electric energy as power.

[0048] Reference Figure 1 , an electric vehicle charging system according to an embodiment of the present invention may include an electric vehicle supply equipment (EVSE) 10 and an electric vehicle (EV) 20 .

[0049] The electric vehicle power supply device 10 is a facility for supplying AC or DC power, and can be set in a power supply or in a home, and can also be implemented as a portable device. The electric vehicle power supply device 10 can be used interchangeably with a power supply, an AC power supply, a DC power supply, etc. The electric vehicle power supply device 10 can receive AC or DC power from a main power supply. The main power supply may include a power system, etc. The electric vehicle power supply device 10 can transform or convert the AC or DC power received from the main power supply to supply the transformed or converted AC or DC power to the electric vehicle 20.

[0050] The electric vehicle 20 refers to a vehicle that operates by receiving all or part of the energy from the installed battery. The electric vehicle 20 may include a plug-in hybrid electric vehicle (PHEV) that travels with an engine using fossil fuels and an electric vehicle that travels only with the electric energy charged in the battery. The battery provided in the electric vehicle 20 may be charged by receiving power from the electric vehicle supply equipment 10.

[0051] Figure 2 is a view showing a configuration of an electric vehicle charging system according to an embodiment of the present invention.

[0052] The electric vehicle charging system according to an embodiment of the present invention may include an electric vehicle supply equipment (EVSE) 10, a cable 50, a connector 51, an inlet 52, a junction box 100, an electric vehicle charge controller (EVCC) 200, a battery 300, a battery management system (BMS) 400, and an electric power control unit (EPCU) 500. The configuration included in the electric vehicle charging system may be classified into a configuration on the electric vehicle supply equipment 10 side (EVSE side) and a configuration on the electric vehicle 20 side (EV side). The configuration on the electric vehicle supply equipment 10 side may include the electric vehicle supply equipment 10, a cable 50, and a connector 51. The configuration on the electric vehicle side may include an inlet 52, a junction box 100, an electric vehicle charge controller 200, a battery 300, a battery management system 400, and an electric power control unit 500. The classification is for convenience of description, but is not limited thereto.

[0053] First, the electric vehicle supply equipment 10 supplies power for charging the battery 300 of the electric vehicle. The electric vehicle supply equipment 10 may transmit power received from a main power source (e.g., a power system) to the electric vehicle 20, at which time the electric vehicle supply equipment 10 may reduce or convert the power received from the main power source to supply the reduced or converted power to the electric vehicle 20. According to one embodiment, when the electric vehicle supply equipment 10 supplies AC power to the electric vehicle 20, the electric vehicle supply equipment 10 may convert the AC power received from the main power source and supply the converted AC power to the electric vehicle 20. In another embodiment, when the electric vehicle supply equipment 10 supplies DC power to the electric vehicle 20, the electric vehicle supply equipment 10 may convert the AC power received from the main power source into DC power to supply the DC power to the electric vehicle 20. In order to convert or transform power, the electric vehicle supply equipment 10 may include a power conversion unit. According to an embodiment, the electric vehicle supply equipment 10 may include a rectifier, an isolation transformer, an inverter, a converter, and the like.

[0054] The electric vehicle power supply equipment 10 may include a charging control unit configured to transmit and receive various control signals required for charging the battery 300 of the electric vehicle 20, and control the battery charging process. The charging control unit may transmit and receive control signals to and from the electric vehicle 20, and perform the battery charging process. The control signal may include information such as ready to charge, end of charging, close range detection, etc. The charging control unit may include a communication unit configured to communicate with the electric vehicle 20, and the communication unit may communicate with the electric vehicle 20 using power line communication (PLC), a controller area network (CAN), etc. The communication unit may also be included in the charging control unit, or may also be configured separately.

[0055] Next, the cable 50 , the connector 51 , and the inlet 52 electrically connect the electric vehicle supply equipment 10 and the electric vehicle.

[0056] The cable 50 transmits power and signals between the EVSE 10 and the electric vehicle 20. The cable 50 may include a power line configured to transmit power, a signal line configured to transmit a control signal related to charging, a ground line configured to be connected to the ground, and the like.

[0057] The cable 50 is connected to the electric vehicle supply equipment 10. According to one embodiment, the electric vehicle supply equipment 10 and the cable 50 can be directly connected without a separate connection configuration. According to another embodiment, the electric vehicle supply equipment 10 and the cable 50 can be connected by coupling a socket provided in the electric vehicle supply equipment 10 with a plug provided in the cable 50.

[0058] The connector 51 may be connected to the cable 50, and the inlet 52 may be provided in the electric vehicle 20. The connector 51 and the inlet 52 may be combined together and named a coupler. The connector 51 and the inlet 52 have a structure that can be coupled to each other, and the electric vehicle 20 and the electric vehicle power supply device 10 may be electrically connected by coupling the connector 51 and the inlet 52. The inlet 52 and the connector 51 may be connected not only directly but also through an adapter.

[0059] The connector 51 and the inlet 52 may include a plurality of pins that can be coupled to each other. For example, one of the plurality of pins may be a pin for a CP port, through which a pilot (CP) signal is controlled to be transmitted between the electric vehicle power supply device 10 and the electric vehicle charging controller 200; another pin may be a pin for a proximity detection (PD) port, which senses whether the connector 51 and the inlet 52 are close to each other; another pin may be a pin for connecting to a protective ground (PE) port of the electric vehicle power supply device 10. Another of the plurality of pins may be a pin for driving a motor configured to open a fuel cap, another pin may be a pin for sensing temperature, another pin may be a pin for sensing a light emitting diode (LED), and another pin may be a pin for CAN communication. One of the plurality of pins may be a pin for a voltage line applied from a collision detection sensor in the electric vehicle 20, another pin may be a battery pin for supplying charging power to the electric vehicle 20, and yet another pin may be a pin for high voltage protection. However, the number and function of the pins are not limited thereto, and various modifications may be made.

[0060] The junction box 100 transmits the power supplied from the electric vehicle supply equipment 10 to the battery 300. The power supplied from the electric vehicle supply equipment 10 is a high voltage, and when the power is directly supplied to the battery 300, the battery 300 may be damaged due to the surge current. The junction box 100 may include at least one relay to prevent damage to the battery due to the surge current.

[0061] The electric vehicle charging controller 200 may control part or all of the processes associated with charging the battery of the electric vehicle 20. The electric vehicle charging controller 200 may be referred to as an electric vehicle communication controller (EVCC).

[0062] The electric vehicle charging controller 200 may communicate with the electric vehicle supply equipment 10. The electric vehicle charging controller 200 may transmit and receive control commands related to the battery charging process from the electric vehicle supply equipment 10. According to one embodiment, the electric vehicle charging controller 200 may communicate with a charging control unit provided in the electric vehicle supply equipment 10, and transmit and receive control commands related to the battery charging process from the charging control unit.

[0063] The electric vehicle charge controller 200 may communicate with the electric vehicle 20. The electric vehicle charge controller 200 may receive a control command related to a battery charging process from the electric vehicle 20. According to one embodiment, the electric vehicle charge controller 200 may communicate with a battery management system 400 of the electric vehicle 20, and also receive a control command related to a battery charging process from the battery management system 400. According to another embodiment, the electric vehicle charge controller 200 may communicate with a power control unit 500 of the electric vehicle 20, and receive a control command related to a battery charging process from the power control unit 500.

[0064] The electric vehicle charging controller 200 may include a microcontroller unit (MCU), a communication unit, a relay unit, etc. to perform the above functions.

[0065] The battery management system 400 manages the energy state of the battery 300 in the electric vehicle 20. The battery management system 400 can monitor the use state of the battery 300 and perform control for efficient energy distribution. For example, the battery management system 400 can transmit the available power state of the electric vehicle 20 to the vehicle control unit and the inverter for efficient use of energy. As another example, the battery management system 400 can correct the voltage deviation of each cell of the battery 300 or drive a cooling fan to maintain the battery 300 at an appropriate temperature.

[0066] The power control unit 500 is a unit configured to control the overall movement of the electric vehicle, including the control of the motor. The power control unit 500 may include a motor control unit (MCU), a low-voltage DC-DC converter (LDC), and a vehicle control unit (VCU). The motor control unit may be referred to as an inverter. The motor control unit may receive DC power from a battery, convert the DC power into three-phase AC power, and control the motor according to a command from the vehicle control unit. The low-voltage DC converter may convert high-voltage power into low-voltage (e.g., 12 [V]) power, and supply the low-voltage power to each component of the electric vehicle 20. The vehicle control unit is used to maintain system performance regarding the electric vehicle 20 as a whole. The vehicle control unit may perform various functions such as charging and driving together with various units such as a motor control unit and a battery management system 400.

[0067] Figure 3 : is a view showing a circuit configuration of an electric vehicle charging system according to an embodiment of the present invention.

[0068] Reference Figure 3 The electric vehicle charging system according to the embodiment of the present invention includes an electric vehicle power supply device 10 , a connector 51 , an inlet 52 , and an electric vehicle 20 .

[0069] First, the electric vehicle supply equipment 10 may include overload circuit breakers RCBO1 and RCBO2, a power conversion system (PCS), an insulation monitoring unit CT, a communication unit COM1, a plurality of power lines DC+ and DC-, a plurality of signal lines C1 to C6, and a ground line FE. The plurality of power lines DC+ and DC-, the plurality of signal lines C1 to C6, and the ground line FE may be extended to the electric vehicle 20 by coupling the connector 51 to the inlet 52.

[0070] The electric vehicle supply equipment 10 may receive AC power from the power system. The received AC power may pass through overload circuit breakers RCBO1 and RCBO2. The overload circuit breakers RCBO1 and RCBO2 may be used to block the reception of AC power when an overload occurs in the electric vehicle supply equipment 10.

[0071] The AC power passing through the overload circuit breaker RCBO1 is input to the power conversion system PCS and converted into DC power. The power conversion system PCS supplies the DC power to the electric vehicle 20 through two power lines DC+ and DC-. A diode a configured to block a reverse voltage from the electric vehicle 20 may be provided on the first power line DC+ of the two power lines DC+ and DC-, and a fuse u configured to prevent damage due to an overvoltage applied from the electric vehicle 20 may be provided on the second power line DC- thereof.

[0072] The insulation monitoring unit CT may be provided between the two power lines DC+ and DC- and the ground. The insulation monitoring unit CT may monitor the insulation state of the two power lines DC+ and DC-.

[0073] The first signal line C1 and the second signal line C2 may refer to signal lines indicating the start / stop state of the electric vehicle power supply device 10. The first signal line C1 and the second signal line C2 may transmit charging sequence signals (such as ready to charge and end of charging) from the electric vehicle power supply device 10 to the electric vehicle 20. To this end, a power supply with an amplitude of 12 [V] may be connected to one end of the first signal line C1, and a ground may be connected to one end of the second signal line C2. In addition, two switching units d1 and d2 may be respectively provided on the first signal line C1 and the second signal line C2. In the electric vehicle power supply device 10, the two switching units d1 and d2 may transmit the charging sequence signal to the electric vehicle through a switching operation.

[0074] The third signal line C3 may refer to a signal line indicating a connection state between the connector 51 and the inlet 52. The third signal line C3 transmits a short distance signal according to a connection state between the connector 51 and the inlet 52. One end of the third signal line C3 may be connected to the second signal line C2.

[0075] The fourth signal line C4 may refer to a signal line configured to allow charging of the electric vehicle 20. The fourth signal line C4 may transmit a control signal such as starting charging or stopping charging from the electric vehicle 20 to the electric vehicle supply equipment 10. The fourth signal line C4 may be connected to a signal sensing unit j, and the signal sensing unit j may sense the control signal transmitted through the fourth signal line C4.

[0076] The fifth signal line C5 and the sixth signal line C6 may refer to signal lines for data communication. The fifth signal line C5 and the sixth signal line C6 may be connected to the communication unit COM1.

[0077] Next, the electric vehicle may include a junction box 100, an electric vehicle charging controller 200, and a battery 300. The electric vehicle 20 may include a plurality of power lines DC+ and DC-, a plurality of signal lines C1 to C6, and a ground line FE.

[0078] The junction box 100 may be connected to the two power lines DC+ and DC-. The junction box 100 may include two contactors c respectively provided on the two power lines DC+ and DC-. The two contactors may be turned on and off by the electric vehicle charging controller 200. The junction box 100 may be connected to the battery 300 through the two power lines DC+ and DC-, and may transmit the DC power received from the electric vehicle power supply device 10 to the battery 300 to perform charging.

[0079] The electric vehicle charging controller 200 may include a relay unit e, a plurality of signal sensing units f, g, and h, a switch k, and a communication unit COM2. The electric vehicle charging controller 200 may be connected to the plurality of signal lines C1 to C6 and a ground line FE.

[0080] The relay unit e may be disposed between the first signal line C1 and the second signal line C2. Specifically, one end of the relay unit e may be connected to the second signal line C2, and the other end may be connected to the first signal line C1. At this time, two contactors C may be connected between the other end of the relay unit e and the first signal line C1. The relay unit E may control the opening and closing of the two contactors C by opening and closing operations.

[0081] The first signal sensing unit f and the second signal sensing unit g are connected to the first signal line C1 and the second signal line C2, respectively. The two signal sensing units f and g can sense signals generated when the two switch units D1 and D2 provided in the electric vehicle power supply device 10 are turned on. The two signal sensing units f and g can transmit the sensed signals to a microcontroller included in the electric vehicle charging controller 200, a vehicle control unit, etc.

[0082] The third signal sensing unit h is connected to the third signal line C3 . The third signal sensing unit h may sense a signal for sensing a connection state between the connector 51 and the inlet 52 .

[0083] The switch k is connected to the fourth signal line C4. When the switch K is turned on, a signal notifying the start of charging may be transmitted to the electric vehicle supply equipment 10.

[0084] The communication unit COM2 is connected to the fifth signal line C5 and the sixth signal line C6. The communication unit COM2 can communicate with the communication unit COM1 through the fifth signal line C5 and the sixth signal line C6.

[0085] Figure 4 is a view showing a circuit configuration of an electric vehicle charging system according to another embodiment of the present invention.

[0086] Reference Figure 4, the electric vehicle charging system according to an embodiment of the present invention includes an electric vehicle power supply device 10, a connector 51, an inlet 52, and an electric vehicle 20. The electric vehicle charging system includes a plurality of power lines DC+ and DC-, a plurality of signal lines S+, S-, CC1, CC2, A+ and A-, and a ground line PE, which connect the electric vehicle power supply device 10, the connector 51, the inlet 52, and the electric vehicle 20. The plurality of power lines DC+ and DC-, the plurality of signal lines S+, S-, CC1, CC2, A+ and A-, and the ground line PE provided in the electric vehicle power supply device 10 and the electric vehicle 20 can be electrically connected through coupling of the connector 51 and the inlet 52.

[0087] The electric vehicle power supply device 10 may include first to fourth relays K1 to K4, a first resistor R1, a first ground power source, a first pull-up power source VP1, and a first charging control unit CONT1. In addition, a first power line DC+, a second power line DC-, first to third signal lines S+, S-, and CC1, fifth and sixth signal lines A+ and A-, and a ground line PE may be provided in the electric vehicle power supply device 10.

[0088] The first relay K1 may be provided on the first power line DC+. The second relay K2 may be provided on the second power line DC-. By connecting the first relay K1 and the second relay K2, DC power may be supplied to the first power line DC+ and the second power line DC-. A positive (+) DC voltage may be applied to the first power line DC+, and a negative (-) DC voltage may be applied to the second power line DC-. The rated voltage applied to each of the first power line DC+ and the second power line DC- may be 750 [V] or 125 [V], and the rated current may be 250 [A].

[0089] The first ground power source may be connected to the ground line PE.

[0090] The first charging control unit CONT1 may be connected to a first signal line S+ and a second signal line S-. The first charging control unit CONT1 may transmit signals related to charging control to and receive signals related to charging control from a second charging control unit CONT2 of the electric vehicle. Each of the first signal line S+ and the second signal line S- may be a controller area network (CAN) communication line. The first signal line S+ may be a communication line through which a CAN_high signal is transmitted and received, and the second signal line S- may be a communication line through which a CAN_low signal is transmitted and received. The CAN_high signal and the CAN_low signal may be differential signals.

[0091] The first pull-up power supply VP1 may be connected to the third signal line CC1. The first resistor R1 may be disposed on the third signal line CC1. The first resistor R1 may have a first end connected to the first pull-up power supply VP1 and a second end connected to the connector 51. The second end of the first resistor R1 may be connected to the first charging control unit CONT1. The first charging control unit CONT1 may receive a sensing signal corresponding to a voltage value of the first end of the first resistor R1. The first resistor R1 may be a pull-up resistor.

[0092] The third relay K3 may be provided on the fifth signal line A+. The fourth relay K4 may be provided on the sixth signal line A-. When the third relay K3 and the fourth relay K4 are turned on, a signal may be supplied to the fifth signal line A+ and the sixth signal line A-. At this time, the signal may be a charging sequence signal.

[0093] The first power line DC+, the second power line DC-, the first to the sixth signal lines S+, S-, CC1, CC2, A+ and A-, and the ground line PE may be provided on the connector. The first power line DC+, the second power line DC-, the first to the third signal lines S+, S- and CC1, the fifth and sixth signal lines A+ and A-, and the ground line PE provided on the connector may extend from the first power line DC+, the second power line DC-, the first to the third signal lines S+, S- and CC1, the fifth and sixth signal lines A+ and A-, and the ground line PE of the electric vehicle power supply device 10, respectively.

[0094] The connector 51 may include a second resistor R2 and a third resistor R3. The second resistor R2 may be disposed between the ground line PE and the third signal line CC1. The switch may be disposed between the second resistor R2 and the ground line PE. The switch may be operated by a mechanical unit disposed outside the connector 51. For example, the switch may be turned on by a user pressing the mechanical unit disposed outside the connector 51, and the third resistor R3 may be disposed between the ground line PE and the fourth signal line CC2.

[0095] The first power line DC+, the second power line DC-, the first to sixth signal lines S+, S-, CC1, CC2, A+ and A-, and the ground line PE may be arranged on the inlet 52. The inlet 52 may include a plurality of connection pins for coupling with the connector 51. The inlet 52 may include a connection pin corresponding to each of the first power line DC+, the second power line DC-, the first to sixth signal lines S+, S-, CC1, CC2, A+ and A-, and the ground line PE. The first power line DC+, the second power line DC-, the first to third signal lines S+, S- and CC1, the fifth and sixth signal lines A+ and A-, and the ground line PE arranged on the inlet 52 may extend from the first power line DC+, the second power line DC-, the first and second signal lines S+ and S-, the fourth to sixth signal lines CC2, A+ and A-, and the ground line PE of the electric vehicle 20, respectively. The third signal line CC1 arranged on the inlet 52 does not extend toward the electric vehicle 20.

[0096] The inlet 52 may include a fourth resistor R4. The fourth resistor R4 may be disposed between the ground line PE and the third signal line CC1.

[0097] The electric vehicle 20 may include a junction box 100 , an electric vehicle charging controller 200 , a battery 300 , a fifth resistor R5 , a second pull-up power source VP2 , and a second ground power source.

[0098] The junction box 100 may include a fifth relay K5 and a sixth relay K6. The fifth relay K5 may be arranged on the first power line DC+. The sixth relay K6 may be arranged on the second power line DC-. When the fifth relay K5 and the sixth relay K6 are turned on, DC power may be supplied to the first power line DC+ and the second power line DC-. A positive (+) DC voltage may be applied to the first power line DC+, and a negative (-) DC voltage may be applied to the second power line DC-. The rated voltage applied to each of the first power line DC+ and the second power line DC- may be 750 [V] or 125 [V], and the rated current may be 250 [A].

[0099] The battery 300 may be connected to the first power line DC+ and the second power line DC-, and charged by receiving DC power.

[0100] The second ground power source may be connected to the ground line PE.

[0101] The second charging control unit CONT2 may be connected to the first signal line S+ and the second signal line S-. The second charging control unit CONT2 may transmit and receive signals related to charging control to and from the first charging control unit CONT1 of the electric vehicle power supply device 10. Each of the first signal line S+ and the second signal line S- may be a controller area network (CAN) communication line. The first signal line S+ may be a communication line through which a CAN_high signal is transmitted and received, and the second signal line S- may be a communication line through which a CAN_low signal is transmitted and received. The CAN_high signal and the CAN_low signal may be differential signals.

[0102] The second pull-up power supply VP2 may be connected to the fourth signal line CC2. The fifth resistor R5 may be disposed on the fourth signal line CC2. The fifth resistor R5 may have a first end connected to the second pull-up power supply VP2 and a second end connected to the inlet 52. The second end of the fifth resistor R5 may be connected to the second charging control unit CONT2. The second charging control unit CONT2 may receive a sensing signal corresponding to a voltage value of the second end of the fifth resistor R5. The fifth resistor R5 may be a pull-up resistor.

[0103] The second charging control unit CONT2 may be connected to the fifth signal line A+ and the sixth signal line A-. The second charging control unit CONT2 may receive a signal through the fifth signal line A+ and the sixth signal line A-. At this time, the signal may be a charging sequence signal. The charging sequence signal may also be used as a low-voltage auxiliary power supply for driving the second charging control unit CONT2.

[0104] Figure 5 and Figure 6 is used to describe Figure 4 A view of the process of detecting an open ground wire condition in an electric vehicle charging system.

[0105] Figure 5 Flow of current in a state where the ground line PE on the electric vehicle supply equipment 10 side and the ground line PE on the electric vehicle 20 side are connected is shown. At this time, the switch connected to the first end of the second resistor R2 may be turned off.

[0106] Reference Figure 5 When the inlet 52 and the connector 51 are coupled and the ground line PE is connected to each other, a current flows from the first pull-up power source VP1 to the first ground power source through the first resistor R1 and the fourth resistor R4. In other words, a closed loop is formed.

[0107] The first charging control unit CONT1 may determine whether the connector 51 and the inlet 52 are coupled to each other through a sensing signal corresponding to a voltage value of the second end of the first resistor R1. According to an embodiment, when the sensing signal is sensed, the first charging control unit CONT1 may determine that the connector 51 and the inlet 52 are coupled through a ground pin configured to connect the ground line PE and a third signal pin configured to connect the third signal line CC1.

[0108] Furthermore, when the inlet 52 and the connector 51 are coupled and the ground line PE is connected to each other, a current flows from the second pull-up power source VP2 to the second ground power source through the fifth resistor R5 and the third resistor R3. In other words, a closed loop is formed.

[0109] The second charging control unit CONT2 may determine whether the connector 51 and the inlet 52 are coupled to each other through a sensing signal corresponding to a voltage value of the second end of the fifth resistor R5. According to an embodiment, when the sensing signal is sensed, the second charging control unit CONT1 may determine that the connector 51 and the inlet 52 are coupled through a ground pin configured to connect the ground line PE and a fourth signal pin configured to connect the fourth signal line CC2.

[0110] As described above, the first charging control unit CONT1 and the second charging control unit CONT2 may determine whether the connector 51 and the inlet 52 are connected by the presence or absence of a sensing signal transmitted to each of the first charging control unit CONT1 and the second charging control unit CONT2. According to an embodiment, the first charging control unit CONT1 and the second charging control unit CONT2 may determine whether the connector 51 and the inlet 52 are connected by the presence or absence of a sensing signal transmitted to each of the first charging control unit CONT1 and the second charging control unit CONT2.

[0111] Figure 6 The flow of current in a state where the ground line PE on the electric vehicle electric supply equipment 10 side and the ground line PE on the electric vehicle side are disconnected is shown.

[0112] In a state where the switch coupled to the connector 51 and the inlet 52 and connected to the first end of the second resistor R2 is turned off, when any one of the ground line PE, the third signal line CC1, and the fourth signal line CC2 is not electrically connected, any one of the first charging control unit CONT1 and the second charging control unit CONT2 may not receive a sensing signal. For example, when the ground line PE is not connected, neither the first charging control unit CONT1 nor the second charging control unit CONT2 can receive a sensing signal. As another example, when the third signal line CC1 is not connected, the first charging control unit CONT1 may not receive a sensing signal. As another example, when the fourth signal line CC2 is not connected, the second charging control unit CONT2 may not receive a sensing signal. The first charging control unit CONT1 and the second charging control unit CONT2 may determine the connection state between the connector 51 and the inlet 52, respectively, based on whether a sensing signal is received. In this case, the first charging control unit CONT1 and the second charging control unit CONT2 may not determine which part of the ground line PE, the first signal line CC1, and the second signal line CC2 has been disconnected.

[0113] However, if Figure 6 As shown, when the connector 51 and the inlet 52 are coupled and the switch connected to the first end of the second resistor R2 is turned on, the second charging control unit CONT2 can receive the sensing signal even when the inlet 52 and the connector 51 are not coupled and thus the connection between the ground line PE is disconnected. This is because a current is formed that flows from the first pull-up power source VP1 through the first resistor R1 and the second to fourth resistors R2 to R4 to the second ground power source. In other words, a closed loop is formed.

[0114] As described above, since a closed loop is formed even when the ground wire PE is not connected, the problem may arise that the second charging control unit CONT2 determines that the ground wire PE on the electric vehicle power supply equipment 10 side and the ground wire PE on the electric vehicle side are connected through a sensing signal corresponding to the voltage value of the second end of the fifth resistor R5.

[0115] Figure 7 is a view schematically showing an electric vehicle charging system according to one embodiment of the present invention.

[0116] The electric vehicle charging system according to an embodiment of the present invention may include an electric vehicle supply equipment 10 and a connector 51. The electric vehicle supply equipment 10 and the connector 51 may be connected by a cable.

[0117] The electric vehicle charging system according to an embodiment of the present invention may include an inlet 52 and an electric vehicle 20. The inlet 52 may be integrally formed by being included in the electric vehicle. Here, the inlet 52 and the electric vehicle may be collectively referred to as an electric vehicle charger.

[0118] The electric vehicle power supply device 10 may include first to fourth relays K1 to K4, a first resistor R1, a first ground power source, a pull-up power source VP1, and a charging control unit CONT1. In addition, a first power line DC+, a second power line DC-, a first signal line CC1, third to sixth signal lines A+, A-, S+ and S-, and a ground line PE may be provided in the electric vehicle power supply device 10.

[0119] The first relay K1 may be provided on the first power line DC+. The second relay K2 may be provided on the second power line DC-. By connecting the first relay K1 and the second relay K2, DC power may be supplied to the first power line DC+ and the second power line DC-. A positive (+) DC voltage may be applied to the first power line DC+, and a negative (-) DC voltage may be applied to the second power line DC-. The rated voltage applied to each of the first power line DC+ and the second power line DC- may be 750 [V] or 125 [V], and the rated current may be 250 [A].

[0120] The first ground power source may be connected to a first ground line PE.

[0121] The pull-up power supply VP1 may be connected to the first signal line CC1. The first resistor R1 may be disposed on the first signal line CC1. The first resistor R1 may have a first end connected to the pull-up power supply VP1 and a second end connected to the connector 51. The second end of the first resistor R1 may be connected to the charging control unit CONT1. The charging control unit CONT1 may receive a sensing signal corresponding to a voltage value of the first end of the first resistor R1.

[0122] The third relay K3 may be provided on the third signal line A+. The fourth relay K4 may be provided on the fourth signal line A-. When the third relay K3 and the fourth relay K4 are turned on, the third signal and the fourth signal may be supplied to the third signal line A+ and the fourth signal line A-, respectively. At this time, each of the third signal and the fourth signal may be a charging sequence signal.

[0123] The charging control unit CONT1 may be connected to the fifth signal line S+ and the sixth signal line S-. The charging control unit CONT1 may transmit and receive signals related to charging control to and from the electric vehicle charging controller 200 of the electric vehicle 20. Each of the fifth signal line S+ and the sixth signal line S- may be a controller area network (CAN) communication line. The fifth signal line S+ may be a communication line through which a CAN_high signal is transmitted and received, and the sixth signal line S- may be a communication line through which a CAN_low signal is transmitted and received. The CAN_high signal and the CAN_low signal may be differential signals.

[0124] The first power line DC+, the second power line DC-, the first to sixth signal lines CC1, CC2, A+, A-, S+ and S-, and the ground line PE may be provided on the connector 51. The first power line DC+, the second power line DC-, the first signal line CC1, the third to sixth signal lines A+, A-, S+ and S-, and the ground line PE provided on the connector 51 may extend from the first power line DC+, the second power line DC-, the first signal line CC1, the third to sixth signal lines A+, A-, S+ and S-, and the ground line PE of the electric vehicle power supply device 10, respectively.

[0125] The connector 51 may include a third resistor R3 and a second resistor R2. The third resistor R3 may be disposed between the ground line PE and the second signal line CC2. The third resistor R3 may be disposed between the ground line PE and the first signal line CC1. The switch may be disposed between the second resistor R2 and the ground line PE. The switch may be operated by a mechanical unit disposed outside the connector 51, for example, the switch may be turned on by a user pressing the mechanical unit disposed outside the connector 51.

[0126] The first power line DC+, the second power line DC-, the first to sixth signal lines CC1, CC2, A+, A-, S+ and S-, and the ground line PE may be provided on the inlet 52, and the first power line DC+, the second power line DC-, the second to sixth signal lines CC2, A+, A-, S+ and S-, and the ground line PE provided on the inlet 52 may extend respectively from the first power line DC+, the second power line DC-, the second to sixth signal lines CC2, A+, A-, S+ and S-, and the ground line PE of the electric vehicle 20. The first signal line CC1 provided on the inlet 52 does not extend toward the electric vehicle.

[0127] The inlet 52 may include a plurality of connection pins P1 to P9 for coupling with the connector 51. The inlet 52 may include connection pins corresponding to each of the first power line DC+, the second power line DC-, the first to sixth signal lines CC1, CC2, A+, A-, S+ and S-, and the ground line PE. The connection pins may include a first power pin P1, a second power pin P2, first to sixth signal pins P4 to P9, and a ground pin P3.

[0128] The ground pin P3 may be coupled to the connector 51 to connect a first ground line PE connected to a first ground power source on the electric vehicle power supply device 10 side and a second ground line PE connected to a second ground power source on the electric vehicle 20 side. The first signal pin P6 may be coupled to the connector 51 to connect a first signal line CC1 on the electric vehicle power supply device 10 side and a first signal line CC1 on the electric vehicle 20 side. The second signal pin P7 may be coupled to the connector 51 to connect a second signal line CC2 on the electric vehicle power supply device 10 side and a second signal line CC2 on the electric vehicle 20 side. The third signal pin P8 may be coupled to the connector 51 to connect a third signal line A+ on the electric vehicle power supply device 10 side and a third signal line A+ on the electric vehicle 20 side. The fourth signal pin P9 may be coupled to the connector 51 to connect a fourth signal line A- on the electric vehicle power supply device 10 side and a fourth signal line A- on the electric vehicle 20 side. The first power pin P1 may be coupled to the connector 51 to connect the first power line DC+ on the electric vehicle supply device 10 side and the first power line DC+ on the electric vehicle 20 side. The second power pin P2 may be coupled to the connector 51 to connect the second power line DC- on the electric vehicle supply device 10 side and the second power line DC- on the electric vehicle 20 side. The fifth signal pin P4 may be coupled to the connector 51 to connect the fifth signal line S+ on the electric vehicle supply device 10 side and the fifth signal line S+ on the electric vehicle 20 side. The sixth signal pin P5 may be coupled to the connector 51 to connect the sixth signal line S- on the electric vehicle supply device 10 side and the sixth signal line S- on the electric vehicle 20 side.

[0129] The inlet 52 may include a signal unit 53. The signal unit 53 may be disposed between the second signal line CC2 and the third signal line A+, and may generate a second signal and transmit the second signal to the electric vehicle charging controller 200. The signal unit 53 may include a fifth resistor R5. The fifth resistor R5 may have a first end connected to the third signal line A+ and a second end connected to the second signal line CC2. A voltage may be applied from the third signal line A+ to the first end of the fifth resistor R5. The voltage applied from the third signal line A+ may be a pull-up power source, and the fifth resistor R5 may be a pull-up resistor.

[0130] The inlet 52 may include a fourth resistor R4. The fourth resistor R4 may be disposed between the ground line PE and the first signal line CC1.

[0131] The electric vehicle 20 may include a junction box 100 , an electric vehicle charging controller 200 , a battery 300 , a second pull-up power source VP1 , and a second ground power source.

[0132] The junction box 100 may include a fifth relay K5 and a sixth relay K6. The fifth relay K5 may be arranged on the first power line DC+. The sixth relay K6 may be arranged on the second power line DC-. When the fifth relay K5 and the sixth relay K6 are turned on, DC power may be supplied to the first power line DC+ and the second power line DC-. A positive (+) DC voltage may be applied to the first power line DC+, and a negative (-) DC voltage may be applied to the second power line DC-. The rated voltage applied to each of the first power line DC+ and the second power line DC- may be 750 [V] or 125 [V], and the rated current may be 250 [A].

[0133] The battery 300 may be connected to the first power line DC+ and the second power line DC-, and charged by receiving DC power.

[0134] The second ground power source may be connected to the second ground line PE.

[0135] The electric vehicle charging controller 200 may be connected to the fifth signal line S+ and the sixth signal line S-. The electric vehicle charging controller 200 may transmit signals related to charging control to the charging control unit CONT1 of the electric vehicle power supply device 10, and receive signals related to charging control therefrom. Each of the fifth signal line S+ and the sixth signal line S- may be a controller area network (CAN) communication line. The fifth signal line S+ may be a communication line through which a CAN_high signal is transmitted and received, and the sixth signal line S- may be a communication line through which a CAN_low signal is transmitted and received. The CAN_high signal and the CAN_low signal may be differential signals.

[0136] The electric vehicle charging controller 200 may be connected to the second signal line CC2. The electric vehicle charging controller 200 may be connected to the signal unit of the inlet 52 through the second signal line CC2.

[0137] The electric vehicle charging controller 200 may be connected to the third signal line A+ and the fourth signal line A-. The electric vehicle charging controller 200 may receive a signal through the third signal line A+ and the fourth signal line A-. At this time, the signal may be a charging sequence signal. The charging sequence signal may be used as a low-voltage auxiliary power supply for driving the electric vehicle charging controller 200.

[0138] The electric vehicle charging controller 200 may include a sensing unit 210. The sensing unit 210 may be connected to the electric vehicle supply equipment 10 through a third signal line A+ and a fourth signal line A- to receive a third signal and a fourth signal.

[0139] The sensing unit 210 may include a first processing unit, a second processing unit, and an insulating unit. The first processing unit may be electrically connected to the electric vehicle power supply device 10 through a third signal line A+ and a fourth signal line A-, and may receive a third signal and a fourth signal from the electric vehicle power supply device 10. The second processing unit may receive the third signal and the fourth signal received by the first sensing unit 210, and transmit the received third signal and the fourth signal to the control unit. The insulating unit may electrically isolate the first processing unit from the second processing unit. The insulating unit may convert the third signal and the fourth signal received from the first processing unit from an electrical signal to an optical signal, and then convert the third signal and the fourth signal from an optical signal to an electrical signal to transmit the converted third signal and the fourth signal to the second processing unit. The insulating unit may be electrically connected to a second ground power supply. The insulating unit may include an optical coupler.

[0140] The electric vehicle charging controller 200 may also include a control unit (not shown). The control unit may determine whether the ground wire PE on the electric vehicle power supply equipment 10 side and the ground wire PE on the electric vehicle side are connected based on the second signal. Specifically, when the voltage amplitude of the second signal is greater than the first voltage value and less than or equal to the second voltage value, the control unit may determine that the first ground wire PE and the second ground wire PE are connected. When the voltage amplitude of the second signal is greater than the second voltage value and less than the third voltage value, the control unit may determine that the ground wire PE on the electric vehicle power supply equipment 10 side and the ground wire PE on the electric vehicle side are not connected. The third voltage value may be less than the voltage amplitude of the third signal. According to another embodiment of the present invention, the control unit may also be included in a battery management system.

[0141] Figure 8 is a view showing a circuit configuration of a sensing unit according to an embodiment of the present invention.

[0142] Reference Figure 8 , the sensing unit 210 may include a first processing unit 211 , a second processing unit 213 , and an insulating unit 212 .

[0143] The first processing unit 211 may include first to third diodes D1 to D3. The first processing unit 211 may include sixth to ninth resistors R6 to R9.

[0144] The first diode D1 can control the voltage amplitude of the third signal received through the third signal line A+ to be less than or equal to a preset value. The first diode D1 can have a first end connected to the third signal line A+ and a second end connected to the anode terminal of the second diode D2. The second end of the first diode D1 can be connected to a second ground power supply. The first diode D1 can be a transient voltage suppressor (TVS) diode. According to one embodiment, the first diode D1 can block a voltage of 30 [V] or more from being input through the third signal line A+.

[0145] The second diode D2 may block a reverse voltage applied to the electric vehicle supply equipment 10 through the third signal line A+. The second diode D2 may have an anode terminal connected to the third signal line A+ and a cathode terminal connected to the sixth resistor R6.

[0146] The third diode D3 may block a reverse voltage applied to the electric vehicle charging controller 200 through the fourth signal line A−. A cathode terminal of the third diode D3 may be connected to the fourth signal line A−, and an anode terminal thereof may be connected to the insulating unit 212 .

[0147] The sixth resistor R6 may have a first end connected to the cathode terminal of the second diode D2. The sixth resistor R6 may have a first end connected to a first end of the eighth resistor R8. The sixth resistor R6 may have a second end connected to a first end of the seventh resistor R7.

[0148] The seventh resistor R7 may have a first end connected to the second end of the sixth resistor R6 and a second end connected to the insulation unit 212 .

[0149] The eighth resistor R8 may have a first end connected to the cathode terminal of the second diode D2. The eighth resistor R8 may have a first end connected to the first end of the sixth resistor R6. The eighth resistor R8 may have a second end connected to the first end of the ninth resistor R9.

[0150] The ninth resistor R9 may have a first end connected to the second end of the eighth resistor R8 and a second end connected to the insulating unit 212 .

[0151] The second processing unit 213 may include a relay K7 , a first switching element SW1 , a second switching element SW2 , first to fourth capacitors C1 to C4 , and tenth to thirteenth resistors R10 to R13 .

[0152] The first end of the relay K7 may be connected to the power supply unit VCC, and the second end thereof may be connected to the insulating unit 212. The power supply unit VCC may be a power supply provided in the electric vehicle. According to the switching state of the relay K7, the insulating unit 212 may receive the power required for driving.

[0153] The first switching element SW1 may have a first end connected to the second end of the relay K7, a second end connected to the first end of the tenth resistor R10, and a third end connected to the insulating unit 212. The first switching element SW1 may be a field effect transistor (FET). The first switching element SW1 may be a bipolar junction transistor (BJT). In this case, the first switching element SW1 may have an emitter terminal connected to the second end of the relay K7, a collector terminal connected to the first end of the tenth resistor R10, and a base terminal connected to the insulating unit 212.

[0154] The second switching element SW2 may have a first end connected to the insulating unit 212, a second end connected to the first end of the twelfth resistor R12, and a third end connected to the insulating unit 212. The second switching element SW2 may be a field effect transistor (FET). The second switching element SW2 may be a bipolar junction transistor (BJT). In this case, the second switching element SW2 may have an emitter terminal connected to the insulating unit 212, a collector terminal connected to the first end of the twelfth resistor R12, and a base terminal connected to the insulating unit 212.

[0155] The first capacitor C1 may have a first end connected to the first switching element SW1 and a second end connected to the second ground terminal.

[0156] The second capacitor C2 may have a first end connected to the first end of the first switching element SW1. The second capacitor C2 may have a first end connected to the first end of the second switching element SW2. The second capacitor C2 may have a second end connected to the second ground terminal.

[0157] The third capacitor C3 may have a first end connected to the tenth resistor R10 and a second end connected to the second ground terminal.

[0158] The fourth capacitor C4 may have a first end connected to the twelfth resistor R12 and a second end connected to the second ground terminal.

[0159] The tenth resistor R10 may have a first end connected to the second end of the first switching element SW1 and a second end connected to the second ground terminal.

[0160] The eleventh resistor R11 may have a first end connected to the tenth resistor R10 and a second end connected to the control unit.

[0161] The twelfth resistor R12 may have a first end connected to the second end of the second switching element SW2 and a second end connected to the second ground terminal.

[0162] The thirteenth resistor R13 may have a first end connected to the twelfth resistor R12 and a second end connected to the control unit.

[0163] The insulating unit 212 may include an optical coupler. The optical coupler may be isolated into an input side and an output side. The optical coupler may have an electrically isolated input side and an output side. The optical coupler may include four terminals (first to fourth terminals) on the input side and four terminals (fifth to eighth terminals) on the output side. The optical coupler may have four terminals on the input side and four terminals on the output side that are electrically isolated. The input side of the first processing unit 211 and the insulating unit 212 connected to the third signal line A+ and the fourth signal line A- is electrically isolated from the output side of the second processing unit 213 and the insulating unit 212.

[0164] The first terminal of the optocoupler may be connected to the second end of the seventh resistor R7. The second terminal of the optocoupler may be connected to the second ground power supply. The third terminal of the optocoupler may be connected to the anode terminal of the third diode D3. The fourth terminal of the optocoupler may be connected to the third end of the ninth resistor R9.

[0165] The fifth terminal of the optocoupler can be connected to the second end of the relay K7 and the first end of the first switching element SW1. The sixth terminal of the optocoupler can be connected to the third end of the first switching element SW1. The seventh terminal of the optocoupler can be connected to the third end of the second switching element SW2. The eighth terminal of the optocoupler can be connected to the second ground power supply.

[0166] Fig. 9 and Fig.10 is a view for describing a configuration of a closed loop when a first ground line and a second ground line are connected according to an embodiment of the present invention.

[0167] Reference Fig. 9 and Fig.10 , the second ground power supply connected to the second ground line PE on the electric vehicle 20 side and the second ground power supply connected to the input side of the optical coupler 212 can be the same ground power supply. Therefore, a current can be generated through the sixth resistor R6, the seventh resistor R7, the second diode D2, the fifth resistor R5 and the third resistor R3 of the optical coupler 212. In other words, a closed loop can be formed. The voltage supplied to the closed loop can be provided from the third signal line A+ connected to the second end of the fifth resistor R5. At this time, the switch connected to the first end of the third resistor R2 can be turned off.

[0168] Since the input side of the optical coupler 212 is electrically isolated from the output side of the optical coupler 212, the closed loop may not be affected by other voltage sources applied to the electric vehicle charging controller 200. Therefore, the sensing signal corresponding to the state in which the first ground line PE and the second ground line PE are connected, sensed at the second end of the fifth resistor R5, may have a constant voltage value.

[0169] Fig.11 is used to describe the Fig. 9 and Fig.10 A view of the sensing signal received by the control unit.

[0170] Fig.11 (a) shows a schematic circuit diagram for describing the formation of a sensing signal, and Fig.11 (b) shows an example of a voltage range of the sensing signal when the first ground line PE is connected to the second ground line PE.

[0171] like Fig.11 As shown in (a), the sensing signal may be generated between the fifth resistor R5 and the third resistor R3. The sensing signal may have a voltage value obtained by dividing the voltage supplied from the third signal line A+ by the fifth resistor R5 and the third resistor R3. The sensing signal may be transmitted to the electric vehicle charging controller 200. The sensing signal may be transmitted to the control unit of the electric vehicle charging controller 200.

[0172] like Fig.11 As shown in (b), when the sensing signal is included in the predetermined voltage range, the control unit can determine that the first ground wire PE is connected to the second ground wire PE. According to an embodiment, when the voltage range is greater than the first voltage value (e.g., 1.9 [V]) and less than or equal to the second voltage value (e.g., 3.1 [V]), the control unit can determine that the first ground wire PE and the second ground wire PE are connected.

[0173] Fig.12 and Fig.13 1 is a view for describing a configuration of a closed loop when the first ground line PE and the second ground line PE according to an embodiment of the present invention are disconnected.

[0174] Reference Fig.12 and Fig.13 , since the ground pin of the inlet 52 is not connected to the optical coupler 212, the first ground line PE and the second ground line PE may be disconnected. Therefore, equipotential bonding may not be performed between the first ground power source and the second ground power source.

[0175] In this case, if Fig.12 and Fig.13As shown, a current can be generated through the second to fifth resistors R2 to R5, the optical coupler 212, the sixth resistor R6, the seventh resistor R7 and the second diode D2. Since the second ground power supply connected to the second ground line PE and the second ground power supply connected to the input side of the optical coupler 212 can be the same ground power supply, a closed loop can be formed. The voltage supplied to the closed loop can be supplied from the third signal line A+ connected to the second end of the fifth resistor R5. At this time, the switch connected to the first end of the second resistor R2 can be turned on.

[0176] Since the input side of the optocoupler 212 is electrically isolated from the output side of the optocoupler 212, the closed loop may not be affected by other voltage sources, etc., applied to the electric vehicle charging controller 200. Therefore, the detection signal detected at the second end of the fifth resistor R5 may have a constant voltage value in response to a state in which the first ground line PE and the second ground line PE are disconnected.

[0177] Fig.14 is used to describe the Fig.12 and Fig.13 A view of the sensing signal received by the control unit.

[0178] Fig.14 (a) shows a schematic circuit diagram for forming a sensing signal, Fig.14 (b) shows an example of a voltage range of the sensing signal when the first ground line PE and the second ground line PE are disconnected.

[0179] like Fig.14 As shown in (a), the sensing signal may be generated between the fifth resistor R5 and the third resistor R3. The sensing signal may have a voltage value obtained by dividing the voltage supplied from the third signal line A+ by the fifth resistor R5 and the second to fourth resistors R2 to R4. The sensing signal may be transmitted to the electric vehicle charging controller 200. The sensing signal may be transmitted to the control unit of the electric vehicle charging controller 200.

[0180] like Fig.14 As shown in (b), when the sensing signal is included in the predetermined voltage range, the control unit can determine that the first ground wire PE and the second ground wire PE are to be connected. According to an embodiment, when the voltage range is greater than the second voltage value (e.g., 3.1 [V]) and less than or equal to the third voltage value (e.g., 4.3 [V]), the control unit can determine that the first ground wire PE and the second ground wire PE are disconnected.

[0181] Although the above mainly describes the embodiment, this is only illustrative and does not limit the present invention. It will be understood by those skilled in the art that various modifications and applications not exemplified above are possible without departing from the basic characteristics of the embodiment. For example, each component specifically shown in the embodiment can be implemented by modification. In addition, differences related to modifications and applications should be understood to be included within the scope of the present invention defined in the appended claims.

Claims

1. An electric vehicle charger, comprising: an inlet, comprising a first signal pin to a sixth signal pin, wherein the first signal pin to the sixth signal pin are configured to be connected to a first signal line to a sixth signal line, respectively; and a sensing unit connected to the electric vehicle power supply equipment through a third signal line and a fourth signal line to receive the third signal and the fourth signal; Wherein, the sensing unit comprises: a first processing unit configured to receive the third signal and the fourth signal from the electric vehicle supply equipment through the third signal line and the fourth signal line; a second processing unit configured to receive the third signal and the fourth signal from the first processing unit, and transmit the third signal and the fourth signal to a control unit; and The insulating unit is configured to electrically isolate the first processing unit from the second processing unit.

2. The electric vehicle charger according to claim 1, wherein: The inlet includes a ground pin coupled to a coupler and configured to connect a first ground wire connected to a first ground power source at the electric vehicle supply equipment and a second ground wire connected to a second ground power source at the electric vehicle.

3. The electric vehicle charger according to claim 2, wherein: The insulating unit is electrically connected to the second ground power source.

4. The electric vehicle charger according to claim 2, wherein: The inlet includes a signal unit disposed between the second signal line and the third signal line and configured to generate a second signal and transmit the second signal to the electric vehicle charging controller.

5. The electric vehicle charger according to claim 4, wherein: The signal unit includes a first resistor having a first end connected to the third signal line and a second end connected to the second signal line.

6. The electric vehicle charger according to claim 4, wherein: When the voltage amplitude of the second signal is greater than the first voltage value and less than or equal to the second voltage value, the control unit determines that the first ground line and the second ground line are connected.

7. The electric vehicle charger according to claim 6, wherein: When the voltage amplitude of the second signal is greater than the second voltage value and less than a third voltage value, the control unit determines that the ground line at the electric vehicle supply equipment and the ground line at the electric vehicle are not connected.

8. The electric vehicle charger according to claim 1, wherein: The insulating unit converts the third signal and the fourth signal received from the first processing unit from electrical signals to optical signals, and then converts the third signal and the fourth signal from the optical signals to the electrical signals to transmit the converted third signal and fourth signal to the second processing unit.

9. The electric vehicle charger according to claim 1, wherein: The insulating unit includes an optical coupler.

10. The electric vehicle charger according to claim 2, wherein: The first processing unit comprises: a first diode configured to control a voltage amplitude of the third signal received through the third signal line to be a preset value or less; a second diode configured to block a reverse voltage applied to the electric vehicle supply equipment through the third signal line; and The third diode is configured to block a reverse voltage applied to the electric vehicle charging controller through the fourth signal line.

11. The electric vehicle charger according to claim 5, wherein: The coupler comprises: a second resistor having a first end connected to the second signal line and a second end connected to a ground line, and When the first ground line and the second ground line are connected, a current passing through the first resistor and the second resistor is generated.

12. The electric vehicle charger according to claim 11, wherein: The coupler comprises: a third resistor having a first end connected to the ground line and a second end connected to the first signal line, and The entrance includes: A fourth resistor has a first end connected to the first signal line and a second end connected to the ground line.

13. The electric vehicle charger according to claim 12, wherein: The control unit generates a current through the first resistor to the fourth resistor when the first ground line and the second ground line are disconnected.

14. The electric vehicle charger according to claim 1, wherein: A first signal pin of the inlet is coupled to a connector and is configured to connect a first signal line at the electric vehicle supply equipment to a first signal line at an electric vehicle.

15. The electric vehicle charger according to claim 1, wherein: A second signal pin of the inlet is coupled to a connector and is configured to connect a second signal line at the electric vehicle supply equipment to a second signal line at the electric vehicle.

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