Electric Vehicle Charging Controller

Abstract

An electric vehicle charging controller according to an embodiment of the present invention includes a switch device connected to a signal detection device of an electric vehicle power supply device through a signal line, generating a charging permission signal and transmitting the signal detection device to the signal detection device; and a control unit controlling the switch device through a plurality of switching signals, wherein the signal detection device of the electric vehicle power supply device includes a first resistor disposed on the signal line, and the switch device includes a first signal unit including a first switching element and turning on the first switching element based on a first switching signal of the plurality of switching signals to generate the charging permission signal; and a second signal unit including a second switching element and turning on the second switching element based on a second switching signal of the plurality of switching signals to generate the charging permission signal, and the first signal unit or the second signal unit generates the charging permission signal depending on a resistance value of the first resistor.

Description

[Technical field]

[0001] The embodiment relates to an electric vehicle charging controller. [Background technology]

[0002] Environmentally 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] For this purpose, an electric vehicle charging controller (EVCC) is installed in the EV, communicates with the EV and the EVSE, and controls the charging of the electric vehicle.

[0004] For example, when the EVCC receives a signal from the electric vehicle instructing it to start charging, it can be controlled to start charging, and when it receives a signal from the electric vehicle instructing it to end charging, it can be controlled to end charging.

[0005] Charging methods for electric vehicles can be divided into fast charging and slow charging depending on the charging time. In the case of fast charging, the battery is charged with a direct current supplied from the charger, and in the case of slow charging, the battery is charged with an alternating current supplied to the charger. Therefore, a charger used for fast charging is called a fast charger or a direct current charger, and a charger used for slow charging is called a slow charger or an alternating current charger.

[0006] An electric vehicle power supply device and an electric vehicle perform a multi-stage charging sequence while monitoring safety. The electric vehicle power supply device and the electric vehicle transmit and receive signals according to the charging sequence through multiple signal lines. Since high voltage power is used to charge an electric vehicle, high accuracy is required for the signals transmitted and received along the signal lines. If part of the circuit is changed due to an improvement in the charging system, changing the magnitude of the signal, etc., the charging sequence will not be performed. Therefore, a problem occurs in which it is necessary to change to parts that apply the improved circuit every time the charging system is improved. Summary of the Invention [Problem to be solved by the invention]

[0007] The embodiment is intended to provide a highly compatible electric vehicle charging controller.

[0008] The embodiment is intended to provide an electric vehicle charging controller capable of detecting a connection state of a signal line between an electric vehicle power supply device and an electric vehicle charging controller.

[0009] The problems to be solved by the examples are not limited to those described above, and may also include the objectives and effects that can be grasped from the means for solving the problems and embodiments described below. [Means for solving the problem]

[0010] An electric vehicle charging controller according to an embodiment of the present invention includes a switch device connected to a signal sensing device of an electric vehicle power supply device through a signal line, generating a charging permission signal and transmitting the signal to the signal sensing device; and a control unit controlling the switch device through a plurality of switching signals. The signal sensing device of the electric vehicle power supply device includes a first resistor disposed on the signal line. The switch device includes a first signal unit including a first switching element and turning on the first switching element based on a first switching signal of the plurality of switching signals to generate the charging permission signal; and a second signal unit including a second switching element and turning on the second switching element based on a second switching signal of the plurality of switching signals to generate the charging permission signal. The first signal unit or the second signal unit generates the charging permission signal depending on a resistance value of the first resistor.

[0011] The signal sensing device of the electric vehicle power supply device includes a first resistor disposed on the signal line, and the switching device allows the first signal unit or the second signal unit to generate the charging permission signal depending on a resistance value of the first resistor.

[0012] The control unit may control the first signal unit to generate the charging permission signal by turning on a first switching element via the first switching signal and turning off a second switching element via the second switching signal when a resistance value of the first resistor is greater than a first reference value and less than a second reference value.

[0013] The control unit may control the second signal unit to generate the charging permission signal by turning off a first switching element via the first switching signal and turning on a second switching element via the second switching signal when a resistance value of the first resistor is greater than the second reference value and less than a third reference value.

[0014] The control unit can receive a node voltage of a node included in the first signal unit or the second signal unit, and detect an electrical connection state between the electric vehicle power supply device and the electric vehicle based on the magnitude of the node voltage.

[0015] The controller may determine that the electrical connection state is an open state when the magnitude of the node voltage is within a first voltage range.

[0016] The controller may determine that the electrical connection state is poor contact when the magnitude of the node voltage is within a second voltage range or a fourth voltage range that is greater than the first voltage range.

[0017] The controller may determine that the electrical connection state is normal when the magnitude of the node voltage is within a third voltage range between the second voltage range and the fourth voltage range.

[0018] The controller may determine that the electrical connection state is an overvoltage state when the magnitude of the node voltage is within a fifth voltage range greater than the fourth voltage range.

[0019] The first signal unit may include a first switching element having a first stage connected to the first resistor and a third stage connected to the control unit; a second resistor having a first stage connected to a second stage of the first switching element and a second stage connected to a ground terminal; a third resistor having a first stage connected to a second stage of the second resistor; a fourth resistor having a first stage connected to the second stage of the third resistor and a second stage connected to the ground terminal; and a first diode having a cathode terminal connected to the second stage of the fourth resistor and an anode terminal connected to the ground terminal.

[0020] The second signal unit may include a second switching element having a first stage connected to the first resistor and a third stage connected to the control unit; a fifth resistor having a first stage connected to a second stage of the second switching element and a second stage connected to a ground terminal; a sixth resistor having a first stage connected to the second stage of the fifth resistor; a seventh resistor having a first stage connected to the second stage of the sixth resistor and a second stage connected to the ground terminal; and a second diode having a cathode terminal connected to the second stage of the seventh resistor and an anode terminal connected to the ground terminal.

[0021] A cathode terminal of the first diode and a cathode terminal of the second diode may be coupled to the controller.

[0022] The second resistor may have a resistance value greater than the fifth resistor, the third resistor may have a resistance value greater than the sixth resistor, and the fourth resistor may have a resistance value less than the seventh resistor.

[0023] An electric vehicle charging controller according to an embodiment of the present invention includes a switch device connected to a signal sensing device of an electric vehicle power supply device through a signal line; and a microcontroller connected to the switch device; the signal sensing device includes a first resistor disposed on the signal line, and the switch device includes a first switching element having a first stage connected to the first resistor and a third stage connected to the control unit; a second resistor having a first stage connected to a second stage of the first switching element and a second stage connected to a ground terminal; a third resistor having a first stage connected to a second stage of the second resistor; and a third resistor having a first stage connected to a second stage of the third resistor and a second stage connected to the ground terminal. a first signal section including a fourth resistor; and a first diode having a cathode terminal connected to the second stage of the fourth resistor and an anode terminal connected to a ground terminal; a second switching element having a first stage connected to the first resistor and a third stage connected to the control section; a fifth resistor having a first stage connected to the second stage of the second switching element and a second stage connected to a ground terminal; a sixth resistor having a first stage connected to the second stage of the fifth resistor; a seventh resistor having a first stage connected to the second stage of the sixth resistor and a second stage connected to the ground terminal; and a second diode having a cathode terminal connected to the second stage of the seventh resistor and an anode terminal connected to the ground terminal. Effect of the Invention

[0024] According to the embodiment, a highly compatible electric vehicle charging controller can be provided.

[0025] The connection state of the signal line between the electric vehicle power supply device and the electric vehicle charging controller can be detected.

[0026] The various and beneficial advantages and effects of the present invention are not limited to the above, but will be more easily understood in the course of describing specific embodiments of the present invention. [Brief description of the drawings]

[0027] [Figure 1] 1 is a diagram illustrating an electric vehicle charging system according to an embodiment of the present invention.

[0028] [Diagram 2] 1 is a diagram showing the configuration of an electric vehicle charging system according to an embodiment of the present invention.

[0029] [Diagram 3] 1 is a diagram showing a circuit configuration of an electric vehicle charging system according to an embodiment of the present invention.

[0030] [Figure 4] 4 is a diagram showing an embodiment of a circuit configuration between a fourth signal line and a signal sensing device in FIG. 3;

[0031] [Diagram 5] 4 is a diagram showing another embodiment of a circuit configuration between the fourth signal line and the signal sensing device of FIG. 3;

[0032] [Figure 6] FIG. 1 is a block diagram showing an electric vehicle charging controller according to an embodiment of the present invention.

[0033] [Figure 7] 1 is a circuit diagram of an electric vehicle charging controller according to an embodiment of the present invention;

[0034] [Figure 8] 4 is a first driving example of the switch device according to the embodiment of the present invention.

[0035] [Figure 9] 6 is a second driving example of the switch device according to the embodiment of the present invention.

[0036] [Figure 10] 4 is a diagram illustrating a voltage detected at a first node of a first signal unit according to an embodiment of the present invention.

[0037] [Figure 11]11 is a diagram illustrating a voltage detected at a second node of a second signal unit according to an embodiment of the present invention.

[0038] [Figure 12] 4 is a diagram illustrating a process of detecting an electrical connection state between an electric vehicle power supply device and an electric vehicle charging controller according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0040] However, the technical concept of the present invention is not limited to the embodiments described but may be embodied in various different forms, and one or more of the components of the embodiments may be selectively combined or substituted within the scope of the technical concept of the present invention.

[0041] Furthermore, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted in a manner that is commonly understood by a person having ordinary skill in the art to which the present invention belongs, unless otherwise clearly defined and described, and commonly used terms, such as terms defined in a dictionary, may be interpreted in light of the contextual meaning of the relevant art.

[0042] Furthermore, 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.

[0043] In this specification, the singular can include the plural unless otherwise specified in the context, and when it is stated that "A and (and) at least one (or more) of B and C" it can include one or more of all possible combinations of A, B, and C.

[0044] Additionally, terms such as first, second, A, B, (a), (b), etc. may be used to describe components of embodiments of the present invention.

[0045] Such terms are merely used to distinguish a component from other components, and are not intended to limit the nature, order, or sequence of the components.

[0046] Furthermore, when a component is described as being "coupled," "coupled," or "connected" to another component, it includes not only cases where the component is directly coupled, coupled, or connected to the other component, but also cases where the component is "coupled," "coupled," or "connected" by yet another component between the component and the other component.

[0047] In addition, when described as being formed or disposed "above or below" each component, "above" or "below" includes not only the case where two components are in direct contact with each other, but also the case where one or more other components are formed or disposed between the two components. In addition, when described as "above or below," it can include not only the upper direction but also the lower direction based on one component.

[0048] FIG. 1 is a diagram illustrating an electric vehicle charging system according to an embodiment of the present invention.

[0049] The electric vehicle charging system according to an embodiment of the present invention may refer to a system for charging the battery of an electric vehicle that operates using electric energy as its power source.

[0050] Referring to FIG. 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).

[0051] The electric vehicle power supply device 10 is a device that supplies AC or DC power, and may be installed in a charging station or in a home, or may be embodied as a portable device. The electric vehicle power supply device 10 may be used as a charging station (supply), an AC charging station (AC supply), a DC charging station (DC supply), etc. The electric vehicle power supply device 10 may receive AC or DC power from a main power source. The main power source may include a power system, etc. The electric vehicle power supply device 10 may transform or convert the AC or DC power supplied from the main power source and supply it to the electric vehicle 20.

[0052] The electric vehicle 20 refers to a vehicle that operates by receiving all or part of its energy from an installed battery. The electric vehicle 20 may include not only an electric vehicle that runs only on electric energy stored in a battery, but also a plug-in hybrid electric vehicle (PHEV) that runs in parallel with an engine that uses fossil fuels. The battery installed in the electric vehicle 20 may be charged by receiving power from the electric vehicle power supply device 10.

[0053] FIG. 2 is a diagram showing the configuration of an electric vehicle charging system according to an embodiment of the present invention.

[0054] The electric vehicle charging system according to an embodiment of the present invention may include an electric vehicle power supply device (10, Electric Vehicle Supply Equipment, EVSE), a cable (50), a connector (51), an inlet (52), a junction box (100), an electric vehicle charging controller (200, Electric Vehicle Charging Controller, EVCC), a battery 300, a battery management system (400, Battery Management System, BMS), and an integrated power control device (500, Electric Power Control Unit, EPCU). The components included in the electric vehicle charging system may be divided into an electric vehicle power supply device 10 side (EVSE side) component and an electric vehicle 20 side (EV side) component. The electric vehicle power supply device 10 side component may include an electric vehicle power supply device 10, a cable 50, and a connector 51. The configuration on the electric vehicle side can include an inlet 52, a junction box 100, an electric vehicle charging controller 200, a battery 300, a battery management system 400, and an integrated power control device 500. This division is for convenience of explanation and is not limiting.

[0055] First, the electric vehicle power supply device 10 supplies power for charging the battery 300 of the electric vehicle. The electric vehicle power supply device 10 can transmit power supplied from a main power source (e.g., a power grid) to the electric vehicle 20. At this time, the electric vehicle power supply device 10 can reduce or convert the power supplied from the main power source and supply it to the electric vehicle 20. According to one embodiment, when the electric vehicle power supply device 10 supplies AC power to the electric vehicle 20, the electric vehicle power supply device 10 can transform the AC power supplied from the main power source and supply it to the electric vehicle 20. In another embodiment, when the electric vehicle power supply device 10 supplies DC power to the electric vehicle 20, the electric vehicle power supply device 10 can convert the AC power supplied from the main power source into DC power and supply it to the electric vehicle 20. In order to transform or convert power, the electric vehicle power supply device 10 can include a power conversion device. According to an embodiment, the electric vehicle power supply device 10 may include a rectifier, an isolation transformer, an inverter, a converter, and the like.

[0056] The electric vehicle power supply device 10 may include a charging control device for transmitting and receiving various control signals required to charge the battery 300 of the electric vehicle 20 and controlling the battery charging process. The charging control device may transmit and receive control signals to and from the electric vehicle 20 to perform the battery charging process. The control signals may include information such as charging preparation, charging completion, and proximity detection. The charging control device may include a communication device for communicating with the electric vehicle 20. The communication device may communicate with the electric vehicle 20 using power line communication (PLC), a controller area network (CAN), etc. The communication device may be included in the charging control device or may be configured separately.

[0057] Next, the cable 50, the connector 51 and the inlet 52 electrically connect the electric vehicle power supply device 10 to the electric vehicle.

[0058] The cable 50 transmits power and signals between the electric vehicle power supply device 10 and the electric vehicle 20. The cable 50 may include a power line for transmitting power, a signal line for transmitting a control signal related to charging, a ground line for connecting to the ground, etc.

[0059] The cable 50 is connected to the electric vehicle power supply device 10. According to one embodiment, the electric vehicle power supply device 10 and the cable 50 may be directly connected without a separate connection structure. According to another embodiment, the electric vehicle power supply device 10 and the cable 50 may be connected through a connection between a socket-outlet provided in the electric vehicle power supply device 10 and a plug provided in the cable 50.

[0060] 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 bundled together and referred to as 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 through the coupling of the connector 51 and the inlet 52. The inlet 52 and the connector 51 may be directly connected or may be connected via an adaptor.

[0061] The connector 51 and the inlet 52 may have 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 CP (Control Pilot) signal is transmitted between the electric vehicle power supply device 10 and the electric vehicle charging controller 200, another may be a pin for a Proximity Detection (PD) port that detects whether the connector 51 and the inlet 52 are in proximity, and yet another may be a pin for a Protective Earth (PE) port that is connected to the protective earth of the electric vehicle power supply device 1010. Yet another of the plurality of pins may be a pin for driving a motor for opening a fuel filler flap, another may be a pin for sensing the motor, another may be a pin for temperature sensing, another may be a pin for LED sensing, and yet another may be a pin for CAN communication. One of the pins may be a pin for a voltage line applied from a collision detection sensor in the electric vehicle 20, another may be a battery pin for supplying charging power to the electric vehicle 20, and still another may be a high voltage protection pin. However, the number and functions of the pins are not limited thereto and may be variously modified.

[0062] The junction box 100 transfers the power supplied from the electric vehicle power supply device 10 to the battery 300. The power supplied from the electric vehicle power supply device 10 is a high voltage, and if this is supplied directly to the battery 300, the battery 300 may be damaged by inrush current. The junction box 100 may include at least one relay to prevent damage to the battery due to inrush current.

[0063] Electric vehicle charging controller 200 may control some or all of the processes related to charging the battery of electric vehicle 20. Electric vehicle charging controller 200 may also be named an Electric Vehicle Communication Controller (EVCC).

[0064] The electric vehicle charging controller 200 can communicate with the electric vehicle power supply apparatus 10. The electric vehicle charging controller 200 can transmit and receive control commands related to the battery charging process from the electric vehicle power supply apparatus 10. According to one embodiment, the electric vehicle charging controller 200 can communicate with a charging control device provided in the electric vehicle power supply apparatus 10, and can transmit and receive control commands related to the battery charging process from the charging control device.

[0065] The electric vehicle charging controller 200 can communicate with the electric vehicle 20. The electric vehicle charging controller 200 can receive control commands related to the battery charging process from the electric vehicle 20. According to one embodiment, the electric vehicle charging controller 200 can communicate with a battery management system 400 of the electric vehicle 20 and can receive control commands related to the battery charging process from the battery management system 400. According to yet another embodiment, the electric vehicle charging controller 200 can communicate with an integrated power controller 500 of the electric vehicle 20 and can receive control commands related to the battery charging process from the integrated power controller 500.

[0066] The electric vehicle charging controller 200 may include a microcontroller unit (MCU), a communication device, a relay device, etc. to perform the above functions.

[0067] 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 current usage status of the battery 300 and perform control for efficient energy distribution. For example, the battery management system 400 can transmit the available power status of the electric vehicle 20 to a vehicle integrated controller and an inverter, etc., for efficient use of energy. As another example, the battery management system 400 can correct the voltage deviation for each cell of the battery 300 or drive a cooling fan to maintain the battery 300 at an appropriate temperature.

[0068] The integrated power control device 500 is a device that controls the overall operation of the electric vehicle, including controlling the motor. The integrated power control device 500 may include a motor control unit (Motor Control Unit, MCU), a low voltage DC-DC converter (LDC), and a vehicle control unit (VCU). The motor control device may be called an inverter. The motor control device may receive DC power from a battery and convert it into a three-phase AC power, and may control the motor according to a command from the vehicle integrated controller. The low voltage DC converter may convert a high voltage power source into a low voltage (e.g., 12 V) power source and supply it to each component of the electric vehicle 20. The vehicle integrated controller plays a role in maintaining the performance of the entire system related to the electric vehicle 20. The vehicle integrated controller may perform various functions, such as charging and driving, together with various devices such as the motor control device and the battery management system 400.

[0069] FIG. 3 is a diagram showing a circuit configuration of an electric vehicle charging system according to an embodiment of the present invention.

[0070] Referring to FIG. 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 .

[0071] First, the electric vehicle power supply device 10 may include overload circuit breakers RCBO1 and RCBO2, a power converter PCS, an insulation monitor CT, a communication device 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 through the coupling of a connector 51 and an inlet 52.

[0072] The electric vehicle power supply device 10 can receive AC power from a power grid. The received AC power can pass through overload circuit breakers RCBO1 and RCBO2. The overload circuit breakers RCBO1 and RCBO2 can cut off the reception of AC power when an overload occurs in the electric vehicle power supply device 10.

[0073] The AC power that has passed through the overload circuit breaker RCBO1 is input to the power conversion device PCS and converted into DC power. The power conversion device PCS supplies DC power to the electric vehicle 20 through two power lines DC+ and DC-. Of the two power lines DC+ and DC-, a diode (a) for blocking reverse voltage from the electric vehicle 20 may be disposed on the first power line DC+, and a fuse (u) for preventing damage due to overvoltage applied from the electric vehicle 20 may be disposed on the second power line DC-.

[0074] The insulation monitoring device CT can be arranged between the two power lines DC+, DC- and the ground. The insulation monitoring device CT can monitor the insulation condition of the two power lines DC+, DC-.

[0075] The first signal line C1 and the second signal line C2 may represent signal lines indicating a start / stop state of the electric vehicle power supply device 10. The first signal line C1 and the second signal line C2 may transmit a charge sequence signal such as "ready to charge" and "end of charge" from the electric vehicle power supply device 10 to the electric vehicle 20. To this end, a power source 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. Two switch devices d1 and d2 may be disposed on the first signal line C1 and the second signal line C2, respectively. The electric vehicle power supply device 10 may transmit a charge sequence signal to the electric vehicle through an on / off operation of the two switch devices d1 and d2.

[0076] The third signal line C3 may represent a signal line indicating a connection state between the connector 51 and the inlet 52. The third signal line C3 may transmit a proximity 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.

[0077] The fourth signal line C4 may represent a signal line for approving permission to charge the electric vehicle 20. The fourth signal line C4 may transmit a control signal, such as to start or stop charging, from the electric vehicle 20 to the electric vehicle power supply device 10. The fourth signal line C4 is connected to a signal sensing device j, and the signal sensing device j may sense the control signal transmitted through the fourth signal line C4.

[0078] The fifth signal line C5 and the sixth signal line C6 may represent signal lines for data communication. The fifth signal line C5 and the sixth signal line C6 may be coupled to the communication device COM1.

[0079] In turn, 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+, DC-, a plurality of signal lines C1 to C6, and a ground line FE.

[0080] The junction box 100 may be connected to two power lines DC+ and DC-. The junction box 100 may include two contactors (c) arranged on the two power lines DC+ and DC-, respectively. 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 DC power received from the electric vehicle power supply device 10 to the battery 300 to perform charging.

[0081] The electric vehicle charging controller 200 may include a relay device e, a plurality of signal sensing devices f, g, h, a switch k, and a communication device COM2. The electric vehicle charging controller 200 may be connected to a plurality of signal lines C1 to C6 and a ground line FE.

[0082] The relay device e may be disposed between the first signal line C1 and the second signal line C2. Specifically, one end of the relay device 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 device e and the first signal line C1. The relay device e may control the opening and closing of the two contactors c through an opening and closing operation.

[0083] The first signal sensing device f and the second signal sensing device g are respectively connected to the first signal line C1 and the second signal line C2. The two signal sensing devices f and g can sense signals generated when two switch devices d1 and d2 provided in the electric vehicle power supply device 10 are turned on. The two signal sensing devices f and g can transmit the sensed signals to a microcontroller or a vehicle integrated controller included in the electric vehicle charging controller 200.

[0084] The third signal sensing device h is connected to the third signal line C3 and can detect a signal for sensing a connection state between the connector 51 and the inlet 52.

[0085] The switch k is connected to the fourth signal line C4. When the switch k is turned on, a signal informing the electric vehicle power supply device 10 of the start of charging may be transmitted.

[0086] The communication device COM2 is connected to the fifth signal line C5 and the sixth signal line C6, and can communicate with the communication device COM1 through the fifth signal line C5 and the sixth signal line C6.

[0087] Fig. 4 is a diagram showing one embodiment of a circuit configuration between the fourth signal line and the signal sensing device of Fig. 3. Fig. 5 is a diagram showing another embodiment of a circuit configuration between the fourth signal line and the signal sensing device of Fig. 3.

[0088] FIG. 4 may be a circuit configuration in CHAdeMO 0.9, which is a standard charging specification for electric vehicles. Referring to FIG. 4, the signal sensing device j connected to the fourth signal line C4 in the electric vehicle power supply device 10 may include an optocoupler and a first resistor RA. A voltage of 12 [V] may be connected to the first stage of the optocoupler, and a first resistor may be connected to the second stage. The fourth signal line C4 may be connected to the switch device k of the electric vehicle charging controller 200 through a pin 6 of the coupler. In this case, the magnitude of the first resistor RA should be 264 [Ω] or less, and the current flowing through the fourth signal line C4 should be 50 [mA] or less.

[0089] FIG. 5 may be a circuit configuration in CHAdeMO 1.0, which is a standard for charging electric vehicles. Referring to FIG. 5, the signal sensing device j connected to the fourth signal line C4 in the electric vehicle power supply device 10 may include an optocoupler and a first resistor. A voltage of 12 [V] may be connected to the first stage of the optocoupler, and a first resistor may be connected to the second stage. The fourth signal line C4 may be connected to the electric vehicle charging controller 200 through a pin 6 of the coupler. The electric vehicle charging controller 200 may have a resistor RB and a switch device k disposed in the fourth signal line C4. In this case, the first resistor RA should be 1 k [Ω], the resistor RB should be 200 [Ω], and the current flowing through the fourth signal line C4 should be 11 [mA] or less.

[0090] 4 and 5, the maximum current values ​​allowed by the fourth signal line C4 are different. Therefore, the electric vehicle charging controllers 200 for the electric vehicle standards CHAdeMO 0.9 and CHAdeMO 1.0 are not compatible with each other. The electric vehicles for the electric vehicle standards CHAdeMO 0.9 and CHAdeMO 1.0 must have different electric vehicle charging controllers 200 to charge the batteries.

[0091] FIG. 6 is a configuration diagram showing an electric vehicle charging controller according to an embodiment of the present invention.

[0092] Referring to FIG. 6, an electric vehicle charging controller 200 according to an embodiment of the present invention includes a switch device 210 and a control unit 220 , and the switch device 210 includes a first signal unit 211 and a second signal unit 212 .

[0093] The switch device 210 is connected to a signal sensing device of the electric vehicle power supply device through a signal line, and generates a charging permission signal and transmits it to the signal sensing device.

[0094] The switch device 210 includes a first signal portion 211 and a second signal portion 212 .

[0095] The first signal unit 211 includes a first switching element. The first signal unit 211 turns on the first switching element based on a first switching signal among a plurality of switching signals output by the control unit 220, thereby generating a charging permission signal.

[0096] The second signal unit 212 includes a second switching element. The second signal unit 212 turns on the second switching element based on a second switching signal among the switching signals output by the control unit 220, thereby generating a charging permission signal.

[0097] The first signal unit 211 and the second signal unit 212 selectively operate. That is, when the first signal unit 211 generates a charging permission signal, the second signal unit 212 does not generate a charging permission signal. Conversely, when the first signal unit 211 does not generate a charging permission signal, the second signal unit 212 generates a charging permission signal. In other words, when the first switching element is turned on by the first switching signal, the second switching element is turned off by the second switching signal. And, when the first switching element is turned off by the first switching signal, the second switching element is turned on by the second switching signal.

[0098] The control unit 220 controls the switching device 210 through a plurality of switching signals. The control unit 220 controls the switching element of the switching device 210 according to the resistance value of a first resistor included in the electric vehicle power supply device.

[0099] When the resistance value of the first resistor is greater than the first reference value and less than the second reference value, the control unit 220 can control the first signal unit 211 to generate a charging permission signal by turning on the first switching element through a first switching signal and turning off the second switching element through a second switching signal.

[0100] When the resistance value of the first resistor is greater than the second reference value and less than the third reference value, the control unit 220 can control the second signal unit 212 to generate a charging permission signal by turning off the first switching element through a first switching signal and turning on the second switching element through a second switching signal.

[0101] The control unit 220 receives the node voltage of the first signal unit 211 or the second signal unit 212, and can detect the electrical connection state between the electric vehicle power supply device and the electric vehicle according to the magnitude of the node voltage.

[0102] In one embodiment, the control unit 220 may determine that the electrical connection state is an open state when the magnitude of the node voltage falls within a first voltage range. In one embodiment, the control unit 220 may determine that the electrical connection state is a poor contact when the magnitude of the node voltage falls within a second voltage range or a fourth voltage range that is larger than the first voltage range. In one embodiment, the control unit 220 may determine that the electrical connection state is a normal state when the magnitude of the node voltage falls within a third voltage range between the second and fourth voltage ranges. In one embodiment, the control unit 220 may determine that the electrical connection state is an overvoltage state when the magnitude of the node voltage falls within a fifth voltage range that is larger than the fourth voltage range.

[0103] The control unit 220 may transmit the detection result of the electrical connection state to a power supply device for the electric vehicle. The control unit 220 may transmit the detection result of the electrical connection state to a battery management system, an integrated power management device, etc. in the electric vehicle. In another example, the control unit 220 may transmit the detection result of the electrical connection state to a user terminal.

[0104] The control unit 220 may be implemented as a microcontroller (MCU).

[0105] FIG. 7 is a circuit diagram of an electric vehicle charging controller according to an embodiment of the present invention.

[0106] The electric vehicle charging controller 200 according to the embodiment of the present invention includes a switch device 210 and a control unit 220 , and the switch device 210 includes a first signal unit 211 and a second signal unit 212 .

[0107] The first signal section 211 includes a first switching element Q1, a second resistor RB, a third resistor RC, a fourth resistor RD, and a first diode D1.

[0108] The first switching element Q1 has a first stage connected to the first resistor RA of the electric vehicle power supply device 10. The second stage of the first switching element Q1 is connected to the first stage of the second resistor RB. The third stage of the first switching element Q1 is connected to the control unit 220. The first switching element Q1 may be a bipolar junction transistor (BJT). The first switching element Q1 may include a collector terminal, an emitter terminal, and a base terminal. The collector terminal of the first switching element Q1 may be connected to the first resistor RA. The emitter terminal of the first switching element Q1 may be connected to the first stage of the second resistor RB. The base terminal of the second switching element Q2 may be connected to the control unit 220.

[0109] The second resistor RB has a first stage connected to the second stage of the first switching element Q1, a second stage connected to a ground terminal, and a second stage connected to the first stage of the third resistor RC.

[0110] The third resistor RC has a first stage connected to the second stage of the second resistor RB. The third resistor RC has a first stage connected to a ground terminal. The third resistor RC has a second stage connected to the first stage of the fourth resistor RD. The third resistor RC has a second stage connected to the cathode terminal of the first diode D1. The third resistor RC has a second stage connected to the controller 220.

[0111] A first stage of the fourth resistor RD is connected to a second stage of the third resistor RC. A first stage of the fourth resistor RD may be connected to a cathode terminal of the first diode D1. A first stage of the fourth resistor RD may be connected to the control unit 220. A second stage of the fourth resistor RD is connected to a ground terminal.

[0112] The first diode D1 has a cathode terminal connected to the second stage of the fourth resistor RD. The first diode D1 has a cathode terminal connected to the control unit 220. The first diode D1 has an anode terminal connected to the ground terminal.

[0113] As described above, the second stage of the third resistor RC, the first stage of the fourth resistor RD, and the cathode terminal of the first diode D1 are connected to the first node. The first node is connected to the control unit 220, and the control unit 220 can receive the node voltage of the first node.

[0114] The second signal section 212 includes a second switching element Q2, a fifth resistor RE, a sixth resistor RF, a seventh resistor RG, and a second diode D2.

[0115] The second switching element Q2 has a first stage connected to the first resistor RA of the electric vehicle power supply device 10. The second switching element Q2 has a second stage connected to the first stage of the fifth resistor RE. The second switching element Q2 has a third stage connected to the control unit 220. The second switching element Q2 may be a bipolar junction transistor. The second switching element Q2 may include a collector terminal, an emitter terminal, and a base terminal. The collector terminal of the second switching element Q2 may be connected to the first resistor RA. The emitter terminal of the second switching element Q2 may be connected to the first stage of the fifth resistor RE. The base terminal of the second switching element Q2 may be connected to the control unit 220.

[0116] The fifth resistor RE has a first stage connected to the second stage of the second switching element Q2, a second stage connected to a ground terminal, and a second stage connected to the first stage of the sixth resistor RF.

[0117] The sixth resistor RF has a first stage connected to the second stage of the fifth resistor RE. The sixth resistor RF has a first stage connected to a ground terminal. The sixth resistor RF has a second stage connected to the first stage of the seventh resistor RG. The sixth resistor RF has a second stage connected to the cathode terminal of the second diode D2. The sixth resistor RF has a second stage connected to the controller 220.

[0118] The seventh resistor RG has a first stage connected to the second stage of the sixth resistor RF. The seventh resistor RG has a first stage connected to the cathode terminal of the second diode D2. The seventh resistor RG has a first stage connected to the control unit 220. The seventh resistor RG has a second stage connected to the ground terminal.

[0119] The second diode D2 has a cathode terminal connected to the second stage of the seventh resistor RG. The second diode D2 has a cathode terminal connected to the control unit 220. The second diode D2 has an anode terminal connected to the ground terminal.

[0120] As described above, the second stage of the sixth resistor RF, the first stage of the seventh resistor RG, and the cathode terminal of the second diode D2 are connected through the second node. The second node is connected to the control unit 220, and the control unit 220 can receive the node voltage of the second node.

[0121] The following Table 1 shows the resistance values ​​of the first to seventh resistors RA to RG according to an embodiment of the present invention.

[0122] [Table 1]

[0123] Referring to Table 1, the first resistor RA of the electric vehicle power supply device 10 may have a resistance value of 1 kΩ or 264Ω. The first signal unit 211 and the second signal unit 212 may have a circuit structure corresponding to each other. The second resistor RB may correspond to the fifth resistor RE, the third resistor RC may correspond to the sixth resistor RF, and the fourth resistor RD may correspond to the seventh resistor RG. However, the resistance values ​​of the corresponding resistors may be different. This is to allow the same node voltage to be input to the control unit 220 at the first node or the second node depending on the connection state even if the first signal unit 211 and the second signal unit 212 are selectively operated depending on the resistance value of the first resistor RA.

[0124] The second resistor RB may have a resistance value greater than the fifth resistor RE. The second resistor RB of the first signal part 211 may have a resistance value of 200 [Ω], and the fifth resistor RE of the second signal part 212 may have a resistance value of 1 k [Ω], which is greater than 200 [Ω].

[0125] The third resistor RC may have a resistance value greater than the sixth resistor RF. The third resistor RC of the first signal part 211 may have a resistance value of 1 k[Ω], and the sixth resistor RF of the second signal part 212 may have a resistance value of 10 k[Ω], which is greater than 1000[Ω].

[0126] The fourth resistor RD may have a resistance value smaller than that of the seventh resistor RG. The fourth resistor RD of the first signal part 211 may have a resistance value of 10 k[Ω], and the seventh resistor RG of the second signal part 212 may have a resistance value of 2.4 k[Ω], which is smaller than 10 k[Ω].

[0127] FIG. 8 shows a first driving example of the switch device according to the embodiment of the present invention.

[0128] The first driving example shown in FIG. 8 represents a current flow when the charging permission signal is generated through the first signal unit 211.

[0129] The electric vehicle power supply device 10 may include a signal sensing device including a first resistor RA and a predetermined circuit for sensing a charging permission signal. The predetermined circuit is connected to a first stage of the first resistor RA, and a voltage is applied to the first resistor RA through a voltage source connected to the predetermined circuit. Since the voltage source applies a voltage to the first resistor RA through the predetermined circuit, a voltage drop may occur in the voltage of the voltage source due to the predetermined circuit.

[0130] In the first driving example, the first switching element Q1 is turned on and the second switching element Q2 is turned off. Therefore, the current I1 from the voltage source of the signal sensing device of the electric vehicle power supply device 10 flows through the second to fourth resistors RD and does not flow through the fifth to seventh resistors RG. Therefore, the signal sensing device of the electric vehicle power supply device 10 senses the charge permission signal generated by the second to fourth resistors RD.

[0131] In the case of the first diode D1, the current I1 does not flow because the cathode terminal is connected to the second stage of the second resistor RB. However, if the voltage applied to the first diode D1 exceeds the breakdown voltage of the first diode D1, the electrical resistance is broken and the current I1 flows. According to an embodiment, if an excessive current such as an inrush current is applied to the first signal unit 211 and a breakdown voltage is applied to the first diode D1, the electrical resistance of the first diode D1 is broken and the current I1 flows to the ground terminal. This is to prevent the control unit 220 connected to the cathode terminal of the first diode D1 from being damaged by an excessive current such as an inrush current.

[0132] FIG. 9 shows a second driving example of the switch device according to the embodiment of the present invention.

[0133] The electric vehicle power supply device 10 may include a signal sensing device including a first resistor RA and a predetermined circuit for sensing a charging permission signal. The predetermined circuit is connected to a first stage of the first resistor RA, and a voltage is applied to the first resistor RA through a voltage source connected to the predetermined circuit. Since the voltage source applies a voltage to the first resistor RA through the predetermined circuit, a voltage drop may occur in the voltage of the voltage source due to the predetermined circuit.

[0134] In the second driving example, the first switching element Q1 is turned off and the second switching element Q2 is turned on. Therefore, the current I2 from the voltage source of the signal sensing device of the electric vehicle power supply device 10 does not flow through the second to fourth resistors RD but flows through the fifth to seventh resistors RG. Therefore, the signal sensing device of the electric vehicle power supply device 10 senses the charge permission signal generated by the fifth to seventh resistors RG.

[0135] In the case of the second diode D2, the current I2 does not flow because the cathode terminal is connected to the second stage of the second resistor RB. However, if the voltage applied to the second diode D2 exceeds the breakdown voltage of the second diode D2, the electrical resistance is broken and the current I2 flows. According to an embodiment, if an excessive current such as an inrush current is applied to the second signal unit 212 and a breakdown voltage is applied to the second diode D2, the electrical resistance of the second diode D2 is broken and the current flows to the ground terminal. This is to prevent the control unit 220 connected to the cathode terminal of the second diode D2 from being damaged by the excessive current such as an inrush current.

[0136] FIG. 10 is a diagram illustrating a voltage detected at a first node of a first signal unit according to an embodiment of the present invention.

[0137] FIG. 10 illustrates a circuit configuration when the first switching signal of the first signal section is turned on and the second switching signal of the second signal section is turned off.

[0138] The controller may receive a node voltage Va from a first node a to which the third resistor RC, the fourth resistor RD and the first diode D1 are connected.

[0139] The following Equation 1 represents the node voltage Va detected at the first node a.

[0140] TIFF0007657812000002.tif20131

[0141] Table 2 below shows resistance and voltage values ​​according to one embodiment.

[0142] [Table 2]

[0143] As shown in Table 2, when the voltage (Vs) is 12 [V], the first resistor RA is 1 k [Ω], the second resistor RB is 200 [Ω], the third resistor RC is 1 k [Ω], and the fourth resistor RD is 10 k [Ω], the node voltage Va of the first node a is about 1.8 [V] according to Equation 1. That is, when the first receiving unit operates normally and generates a charging permission signal, the control unit can receive an input of a node voltage Va of about 1.8 [V]. FIG 11 is a diagram for explaining a voltage detected at the second node of the second signal unit according to an embodiment of the present invention.

[0144] FIG. 11 illustrates a circuit configuration when the first switching signal of the first signal section is turned off and the second switching signal of the second signal section is turned on.

[0145] The controller may receive a node voltage Vb from a second node b to which the sixth resistor RF, the seventh resistor RG and the second diode D2 are connected.

[0146] The following mathematical formula 1 represents the node voltage Vb detected at the second node b.

[0147] TIFF0007657812000004.tif21152

[0148] Table 3 below shows resistance and voltage values ​​according to one embodiment.

[0149] [Table 3]

[0150] As shown in Table 2, when the voltage (Vs) is 12 [V], the first resistor RA is 264 [Ω], the fifth resistor RE is 1 k [Ω], the sixth resistor RF is 1 k [Ω], and the seventh resistor RG is 2.4 k [Ω], the node voltage Vb of the first node is about 1.8 [V] according to Equation 1. That is, when the second receiver operates normally and generates a charging permission signal, the controller can receive an input of the node voltage Vb of about 1.8 [V]. Figure 12 is a diagram for explaining a process of detecting an electrical connection state between an electric vehicle power supply device and an electric vehicle charging controller according to an embodiment of the present invention.

[0151] The control unit can detect an electrical connection state between the electric vehicle power supply device and the electric vehicle charging controller based on the voltage magnitude of the node voltage input from the first receiving unit or the second receiving unit.

[0152] The controller may determine that the electrical connection state is an open case when the magnitude of the node voltage is within a first voltage range. According to an embodiment, the first voltage range may refer to a range greater than a zeroth voltage V0 and less than a first voltage V1. The zeroth voltage V0 may be 0 [V].

[0153] The controller may determine that the electrical connection is out of contact if the magnitude of the node voltage is within a second voltage range that is greater than the first voltage range. According to one embodiment, the first voltage range may refer to a range greater than 0 [V] and less than a first voltage V1, and the second voltage range may refer to a range greater than the first voltage V1 and less than a second voltage V2.

[0154] The control unit may determine that the electrical connection state is normal when the magnitude of the node voltage is within a third voltage range greater than the second voltage range. According to one embodiment, the second voltage range may mean a range greater than the first voltage V1 and less than the second voltage V2, and the third voltage range may mean a range greater than the second voltage V2 and less than the third voltage V3. The third voltage range may be a range including a value of 1.8 [V] that can be detected when the first receiving unit or the second receiving unit is operating normally.

[0155] The controller may determine that the electrical connection is out of contact if the magnitude of the node voltage is within a fourth voltage range greater than the third voltage range. According to one embodiment, the third voltage range may refer to a range greater than the second voltage V2 and less than the third voltage V3, and the fourth voltage range may refer to a range greater than the third voltage V3 and less than the fourth voltage V4.

[0156] The controller may determine that the electrical connection state is an overvoltage state when the magnitude of the node voltage is within a fifth voltage range greater than the fourth voltage range. According to one embodiment, the fourth voltage range may be greater than the third voltage V3 and less than the fourth voltage V4, and the fifth voltage range may be greater than the fourth voltage V4 and less than the fifth voltage V5. The fifth voltage V5 may be 5V.

[0157] The above description is centered on the embodiment, but it is merely illustrative and does not limit the present invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the present embodiment. For example, each component specifically illustrated in the embodiment can be modified and implemented. Differences related to such modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

Claims

1. A switch device connected to a signal sensing device of the electric vehicle power supply device through a signal line, generating a charging permission signal and transmitting the signal to the signal sensing device; and A control unit controls the switch device through a plurality of switching signals; The signal sensing device of the electric vehicle power supply device includes: A first resistor is disposed on the signal line; The switch device comprises: a first signal unit including a first switching element, the first switching element being turned on based on a first switching signal among the plurality of switching signals to generate the charging permission signal; and a second signal unit including a second switching element, the second switching element being turned on based on a second switching signal among the plurality of switching signals to generate the charging permission signal; The first signal unit including the first switching element connected to the first resistor or the second signal unit including the second switching element connected to the first resistor generates the charging permission signal based on a resistance value of the first resistor. Electric vehicle charging controller.

2. The control unit is 2. The electric vehicle charging controller of claim 1, wherein when a resistance value of the first resistor is greater than a first reference value and less than a second reference value, the first signal unit controls to generate the charging permission signal by turning on a first switching element through the first switching signal and turning off a second switching element through the second switching signal.

3. The control unit is 3. The electric vehicle charging controller of claim 2, wherein when the resistance value of the first resistor is greater than the second reference value and less than a third reference value, the controller controls the second signal unit to generate the charging permission signal by turning off a first switching element through the first switching signal and turning on a second switching element through the second switching signal.

4. The control unit is The electric vehicle charging controller of any one of claims 1 to 3, further comprising: a node voltage of a first node of the first signal unit connected to the control unit or a second node of the second signal unit connected to the control unit; and detects an electrical connection state between the electric vehicle power supply device and the electric vehicle based on a magnitude of the node voltage.

5. The control unit is The electric vehicle charging controller of claim 4 , wherein the electrical connection state is determined to be an open state when the magnitude of the node voltage is within a first voltage range.

6. The control unit is The electric vehicle charging controller of claim 5 , wherein the electrical connection state is determined to be poor contact when the magnitude of the node voltage is within a second voltage range or a fourth voltage range that is greater than the first voltage range.

7. The control unit is The electric vehicle charging controller of claim 6 , wherein the electrical connection state is determined to be normal when the magnitude of the node voltage is within a third voltage range between the second voltage range and the fourth voltage range.

8. The control unit is The electric vehicle charging controller of claim 7 , wherein the electrical connection state is determined to be an overvoltage state when the magnitude of the node voltage is within a fifth voltage range greater than the fourth voltage range.

9. The electric vehicle charging controller according to any one of claims 4 to 8, wherein the control unit transmits the result of the electrical connection state to the electric vehicle power supply device.

10. The first signal portion: a first switching element having a first stage connected to the first resistor and a third stage connected to the controller; a second resistor, the first stage of which is connected to the second stage of the first switching element and the second stage of which is connected to a ground terminal; a third resistor whose first stage is coupled to the second stage of the second resistor; a fourth resistor, the first stage of which is coupled to the second stage of the third resistor and the second stage of which is coupled to the ground terminal; and The electric vehicle charging controller of any one of claims 1 to 9, further comprising: a first diode having a cathode terminal coupled to the second stage of the fourth resistor and an anode terminal coupled to a ground terminal.

11. The second signal unit is a second switching element, a first stage of which is connected to the first resistor and a third stage of which is connected to the controller; a fifth resistor, the first stage of which is connected to the second stage of the second switching element and the second stage of which is connected to a ground terminal; a sixth resistor, the first stage of which is coupled to the second stage of the fifth resistor; a seventh resistor, the first stage of which is coupled to the second stage of the sixth resistor and the second stage of which is coupled to the ground terminal; and 11. The electric vehicle charging controller of claim 10, further comprising: a second diode having a cathode terminal coupled to the second stage of the seventh resistor and an anode terminal coupled to a ground terminal.

12. The electric vehicle charging controller of claim 11 , wherein a cathode terminal of the first diode and a cathode terminal of the second diode are coupled to the control unit.

13. the second resistor has a resistance value greater than the fifth resistor; the third resistor has a resistance value greater than that of the sixth resistor; 13. The electric vehicle charging controller of claim 12, wherein the fourth resistor has a smaller resistance value than the seventh resistor.

14. The electric vehicle charging controller according to any one of claims 1 to 13, wherein the first signal section and the second signal section are selectively operable.

15. A switch device connected to the signal sensing device of the electric vehicle power supply device through a signal line; and a microcontroller coupled to the switch device; The signal sensing device comprises: A first resistor is disposed on the signal line; The switch device comprises: a first signal section including: a first switching element, the first stage of which is coupled to the first resistor and the third stage of which is coupled to the microcontroller; a second resistor, the first stage of which is coupled to the second stage of the first switching element and the second stage of which is coupled to a ground terminal; a third resistor, the first stage of which is coupled to the second stage of the second resistor; a fourth resistor, the first stage of which is coupled to the second stage of the third resistor and the second stage of which is coupled to the ground terminal; and a first diode, the cathode terminal of which is coupled to the second stage of the fourth resistor and the anode terminal of which is coupled to the ground terminal; and a second signal unit including: a second switching element, the first stage of which is coupled to the first resistor and the third stage of which is coupled to the microcontroller; a fifth resistor, the first stage of which is coupled to the second stage of the second switching element and the second stage of which is coupled to a ground terminal; a sixth resistor, the first stage of which is coupled to the second stage of the fifth resistor; a seventh resistor, the first stage of which is coupled to the second stage of the sixth resistor and the second stage of which is coupled to the ground terminal; and a second diode, the cathode terminal of which is coupled to the second stage of the seventh resistor and the anode terminal of which is coupled to the ground terminal.

16. 16. The electric vehicle charging controller of claim 15, wherein the cathode terminal of the first diode and the cathode terminal of the second diode are coupled to the microcontroller.

17. the second resistor has a resistance value greater than the fifth resistor; the third resistor has a resistance value greater than that of the sixth resistor; The electric vehicle charging controller according to any one of claims 15 to 16, wherein the fourth resistor has a resistance value smaller than that of the seventh resistor.

18. The electric vehicle charging controller according to any one of claims 15 to 17, wherein at least one of the first switching element and the second switching element is a bipolar junction transistor.

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