Direct current charging pile internal communication method and system

Abstract

The invention relates to the technical field of energy storage charging, in particular to a direct current charging pile internal communication method and system, and the system comprises a communication module in a charging gun and a control module in a charging pile. A power line communication terminal of the charging gun is connected with the control module through a power line; the controller obtains first data information sent by the low-voltage auxiliary power supply terminal and sends the first data information to the carrier module; the carrier module modulates the first data information into a first high-frequency carrier signal, couples the first high-frequency carrier signal to a power line communication terminal for transmission, demodulates second data information and transmits the second data information to the controller; the filter filters a high-frequency carrier signal loaded in the current and shunts the current to the low-voltage auxiliary power supply terminal and the DC / DC isolation power supply; the DC / DC isolation power supply converts the voltage shunted by the filter into the power supply voltage of the controller; according to the invention, the functions of power supply and communication are simultaneously realized, and the material and maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of energy storage charging technology, and in particular to a direct current charging pile internal communication method and system. Background Art

[0002] As electric vehicles are increasingly used, the functions of charging guns used to charge electric vehicles are increasing, and the corresponding connection harnesses are also increasing. For example, according to the current standard, there are 24 signal lines between the control module and the charging gun of a dual-gun charging pile, which is a very large number, and each charging gun has a total of 15 cables with different thicknesses. The thickest cable is 80mm 2 ;The thinnest cable is only 0.75mm 2 ;Bundling these cables together can easily break the thin cables, and can also easily cause disconnection during assembly and wiring. In addition, too many signal lines in the charging gun can easily cause wiring errors, which increases the failure rate of production.

[0003] It can be seen that in the related art, there are hundreds of cables inside the charging pile. Too many cables make it difficult to troubleshoot the line faults and layout the lines. How to reduce the internal cables of the charging pile, reduce the cost and simplify the internal layout of the charging pile is a difficulty that every charging pile manufacturer needs to solve at present. Summary of the invention

[0004] In view of this, an object of an embodiment of the present invention is to provide a method and system for internal communication of a DC charging pile, which can simultaneously realize the functions of power supply and communication and reduce material and maintenance costs.

[0005] In a first aspect, an embodiment of the present invention provides an internal communication system of a DC charging pile, the system comprising: a communication module arranged on a charging gun and a control module arranged on the charging pile; the communication module comprises a controller, a DC / DC isolation power supply, a filter and a carrier module;

[0006] The charging gun is also provided with a low-voltage auxiliary power terminal and a power line communication terminal; the power line communication terminal of the charging gun is connected to the control module through a power line; the low-voltage auxiliary power terminal is used to connect to the BMS of the vehicle;

[0007] The power line communication terminal is respectively connected to the input end of the filter and one end of the carrier module; the other end of the carrier module is connected to the controller; one output end of the filter is connected to the low-voltage auxiliary power supply terminal, and the other output end is connected to the controller through a DC / DC isolation power supply;

[0008] The controller is used to obtain the first data information sent by the low-voltage auxiliary power terminal, and send the obtained first data information to the carrier module;

[0009] The carrier module is used to modulate the first data information into a first high-frequency carrier signal and then couple it to the power line communication terminal for transmission, and is used to demodulate the second high-frequency carrier signal into second data information after receiving the second high-frequency carrier signal and send it to the controller;

[0010] The filter is used to filter the high-frequency carrier signal loaded in the current transmitted from the power line communication terminal, and shunt the current to the low-voltage auxiliary power supply terminal and the DC / DC isolation power supply;

[0011] The DC / DC isolation power supply is used to convert the voltage shunted by the filter into the power supply voltage of the controller.

[0012] Preferably, the communication module further includes a first signal isolation circuit, and the low-voltage auxiliary power terminal is connected to the controller via the first signal isolation circuit.

[0013] Preferably, the communication module includes a relay, which is connected between an output end of the filter and the low-voltage auxiliary power supply terminal; the controller is connected to the coil terminal of the relay; the controller is also used to control the on and off of the relay to control the on and off of the path between the low-voltage auxiliary power supply terminal and the power line communication terminal.

[0014] Preferably, the charging gun is further provided with an electronic lock power supply terminal, and the communication module further includes a drive circuit and a second signal isolation circuit; the electronic lock power supply terminal, the drive circuit, the second signal isolation circuit and the controller are connected in sequence;

[0015] The controller is also used to send an electronic lock control signal, which passes through the second signal isolation circuit and then the drive circuit to the electronic lock power supply terminal to control the electronic lock of the charging gun to lock or unlock.

[0016] Preferably, the charging gun is further provided with an electronic lock feedback terminal, and the communication module further includes a third signal isolation circuit; the electronic lock feedback terminal is connected to the controller via the third signal isolation circuit;

[0017] The electronic lock feedback terminal is used to detect the electronic lock status signal. The electronic lock status signal is sent to the controller after passing through the third signal isolation circuit to feedback the status of the charging gun electronic lock as locked or unlocked.

[0018] Preferably, the charging gun is further provided with a CAN signal terminal, the communication module further comprises a CAN transceiver, and the CAN signal terminal is connected to the controller via the CAN transceiver;

[0019] The electronic lock feedback terminal is used to detect the electronic lock status signal. The electronic lock status signal is sent to the controller after passing through the third signal isolation circuit to feedback the status of the charging gun electronic lock as locked or unlocked.

[0020] Preferably, the charging gun is further provided with a temperature acquisition terminal, and the communication module further comprises a signal processing circuit and a fourth signal isolation circuit; the temperature acquisition terminal, the signal processing circuit, the fourth signal isolation circuit and the controller are connected in sequence;

[0021] The temperature acquisition terminal is used to detect the temperature signal at the charging gun head;

[0022] The signal processing circuit is used to amplify the temperature signal and send the amplified temperature signal to the controller through the fourth signal isolation circuit, and the controller converts the amplified temperature signal into a digital value.

[0023] Preferably, the charging gun is further provided with a connection confirmation terminal, and the communication module further comprises a fifth signal isolation circuit; the connection confirmation terminal is connected to the controller via the fifth signal isolation circuit;

[0024] The connection confirmation terminal is used to detect the connection confirmation signal between the charging gun and the vehicle socket. The connection confirmation signal passes through the fifth signal isolation circuit and is sent to the controller, which converts the connection confirmation signal into a digital quantity.

[0025] In a second aspect, an embodiment of the present invention provides a DC charging pile internal communication method, which is applied to any of the above-mentioned DC charging pile internal communication systems, and the method comprises the following steps:

[0026] S100, the controller obtains first data information sent by the low-voltage auxiliary power terminal, and sends the obtained first data information to the carrier module;

[0027] S200, the carrier module modulates the first data information into a first high-frequency carrier signal and couples it to the power line communication terminal for transmission, and after receiving a second high-frequency carrier signal, demodulates the second high-frequency carrier signal into second data information and sends it to the controller;

[0028] S300, a filter filters a high-frequency carrier signal loaded in the current transmitted from the power line communication terminal, and shunts the current to the low-voltage auxiliary power supply terminal and the DC / DC isolation power supply;

[0029] S400, the DC / DC isolation power supply converts the voltage shunted by the filter into a power supply voltage for the controller.

[0030] The embodiments of the present invention include the following beneficial effects: the internal communication method and system of the DC charging pile provided in the present embodiment transmits the charging gun signal by adopting the power carrier mode, separates the high-frequency carrier signal loaded in the current by a filter, and shunts the current to the low-voltage auxiliary power supply terminal and the DC / DC isolation power supply, thereby respectively powering the charging gun and the controller; modulates the first data information into the first high-frequency carrier signal through the carrier module and couples it to the power line communication terminal, and sends the first high-frequency carrier signal to the control module through the power line communication, thereby realizing the communication connection between the charging gun and the charging pile. The present invention realizes the functions of power supply and communication at the same time, reducing the material and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0032] Figure 1 It is a connection diagram of an internal communication system of a DC charging pile provided by an embodiment of the present invention;

[0033] Figure 2 It is a flow chart of a DC charging pile internal communication method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein are only for the purpose of describing the embodiments of this application and are not intended to limit this application.

[0036] First, some nouns involved in the invention are analyzed:

[0037] PLC is the abbreviation of Power Line Communication, which is a communication method that uses power lines as a data transmission medium. Power line carrier communication refers to the information data at the sending end being modulated by a modem to form a high-frequency carrier signal. The sending end coupler couples this high-frequency carrier signal to the power line for transmission, and the receiving end coupler decouples the signal from the power line, and then restores the original data information through the receiving end modem, and then transmits the original data information to the receiving source to complete the information transmission.

[0038] From the perspective of operating frequency, power line carrier communication can be divided into narrowband power line carrier (NB-PLC) and broadband power line carrier (BB-PLC). At present, when the transmission rate of broadband carrier module is 250Kbps, the maximum transmission distance is 1km, which is much higher than the transmission distance of CAN communication.

[0039] like Figure 1 As shown, Figure 1 An internal communication system of a DC charging pile provided in an embodiment of the present invention comprises: a communication module arranged on a charging gun and a control module arranged on a charging pile; the communication module comprises a controller, a DC / DC isolation power supply, a filter and a carrier module;

[0040] The charging gun is also provided with a low-voltage auxiliary power terminal and a power line communication terminal; the power line communication terminal of the charging gun is connected to the control module through a power line; the low-voltage auxiliary power terminal is used to connect to the BMS of the vehicle to supply power to the BMS of the vehicle;

[0041] In some embodiments, the control module corresponds to the communication module, and the control module also includes a controller and a carrier module; the power line communication terminal of the charging gun is connected to the power line communication terminal of the charging pile through a power line.

[0042] The power line communication terminal is respectively connected to the input end of the filter and one end of the carrier module; the other end of the carrier module is connected to the controller; one output end of the filter is connected to the low-voltage auxiliary power supply terminal, and the other output end is connected to the controller through a DC / DC isolation power supply;

[0043] Specifically, the low-voltage auxiliary power supply terminal includes a positive A+ terminal and a negative A- terminal, and the power line communication terminal includes a positive V+ terminal and a negative V- terminal; the controller is connected to the carrier module signal through a serial port, and the serial port includes a receiving port (RX port for receiving signals) and a sending port (TX port for sending signals); the low-voltage auxiliary power supply terminal is connected to a photocoupler to feed back the output status of the vehicle BMS to the controller in the form of first data information.

[0044] The controller is used to obtain the first data information sent by the low-voltage auxiliary power terminal, and send the obtained first data information to the carrier module; and is used to receive the second data information sent by the carrier module;

[0045] The carrier module is used to modulate the first data information into a first high-frequency carrier signal and then couple it to the power line communication terminal for transmission, and is used to demodulate the second high-frequency carrier signal into second data information after receiving the second high-frequency carrier signal and send it to the controller;

[0046] Specifically, the controller sends the acquired first data information to the carrier module for communication through the serial port. The carrier module modulates the first data information into a high-frequency carrier signal and couples it to the power line between the filter and the power line communication terminal through an internal coupler, thereby sending the first data information to the controller through the power line communication terminal; the coupler also receives the second data information sent from the controller in the control module, and sends the second data information to the controller through the carrier module, thereby realizing the communication between the control module and the communication module;

[0047] The filter is used to filter the high-frequency carrier signal loaded in the current transmitted from the power line communication terminal, and shunt the current to the low-voltage auxiliary power supply terminal and the DC / DC isolation power supply;

[0048] The DC / DC isolation power supply is used to convert the voltage shunted by the filter into the power supply voltage of the controller.

[0049] Specifically, the power line communication terminal receives the current loaded with a high-frequency carrier signal transmitted by the charging pile. After passing through a filter to block the high-frequency carrier signal, one path is sent to the low-voltage auxiliary power supply terminal of the charging gun through a relay to provide auxiliary power supply for the vehicle, and the other path is sent to the DC / DC isolated power supply to provide power for the controller and surrounding circuits; therefore, the power line communication terminal has the functions of power supply and communication.

[0050] In this embodiment, the low-voltage auxiliary power terminal is used to wake up the vehicle BMS and supply power to the vehicle BMS. The low-voltage auxiliary power terminal at the charging gun end is provided with 12V power by the communication module, and the timing is controlled by the controller. The controller modulates the modem to form a high-frequency carrier signal.

[0051] The carrier module includes a coupler and a modem; the coupler in the carrier module at the transmitting end (charging gun) couples the high-frequency carrier signal to the power line communication terminal for transmission. The coupler in the carrier module at the receiving end (charging pile) decouples the high-frequency carrier signal from the power line communication terminal, and then restores the original data information through the modem in the carrier module, and then transmits the original data information to the low-voltage auxiliary power terminal at the charging gun end to complete the control of the charging gun.

[0052] It should be noted that a communication module is added inside the charging gun of the present invention. The communication module includes a carrier module. The carrier module includes a coupler and a modem circuit to realize the loading and modulation and demodulation of high-frequency carrier signals. In actual applications, the communication module and the control module are connected by two 2.5mm 2 The cable connection is used to provide 12V power to the communication module. As long as the low-voltage auxiliary power terminal is turned on, the power supply line is always open.

[0053] In some embodiments, the communication module further includes a first signal isolation circuit, and the low-voltage auxiliary power terminal is connected to the controller via the first signal isolation circuit.

[0054] Specifically, the first signal isolation circuit uses a photocoupler.

[0055] In some embodiments, the communication module includes a relay, the relay is connected between an output terminal of the filter and the low-voltage auxiliary power terminal; the controller is connected to the coil terminal of the relay;

[0056] The controller is also used to control the on and off of the relay to control the on and off of the path between the low-voltage auxiliary power terminal and the power line communication terminal.

[0057] Specifically, the coil terminal of the relay is controlled by a controller (not marked in the figure). The controller controls the on and off of the relay, thereby controlling the path between the low-voltage auxiliary power supply terminal and the power line communication terminal, thereby realizing charging control of the vehicle's BMS.

[0058] In some embodiments, the charging gun is further provided with an electronic lock power supply terminal, and the communication module further includes a drive circuit and a second signal isolation circuit; the electronic lock power supply terminal, the drive circuit, the second signal isolation circuit and the controller are connected in sequence;

[0059] The controller is also used to send an electronic lock control signal, which passes through the second signal isolation circuit and then the drive circuit to the electronic lock power supply terminal to control the electronic lock of the charging gun to lock or unlock.

[0060] Specifically, the electronic lock power supply terminal includes a positive W+ terminal and a negative W- terminal, and the electronic lock power supply terminal is connected to the power supply circuit of the charging gun electronic lock. After the controller sends out the charging gun electronic lock control signal, it passes through the second signal isolation circuit (such as optocoupler, digital isolation signal and other devices), and then passes through the drive circuit to the electronic lock power supply terminal to control the electronic lock of the charging gun to lock or unlock.

[0061] The charging gun acts as the transmitting end. The electronic lock control signal of the charging gun sent by the controller is modulated by the modem in the carrier module to form a high-frequency carrier signal. The coupler in the carrier module couples this high-frequency carrier signal to the power line communication terminal for transmission.

[0062] The charging pile acts as the receiving end, and the coupler in the second carrier module decouples the high-frequency carrier signal from the power line communication terminal, and then restores the original data information through the modem of the communication module; the control of the electronic lock is completed by sending control information to the electronic lock power supply terminal at the charging gun end.

[0063] In some embodiments, the charging gun is further provided with an electronic lock feedback terminal, and the communication module further includes a third signal isolation circuit; the electronic lock feedback terminal is connected to the controller through the third signal isolation circuit;

[0064] The electronic lock feedback terminal is used to detect the electronic lock status signal. The electronic lock status signal is sent to the controller after passing through the third signal isolation circuit to feedback the status of the charging gun electronic lock as locked or unlocked.

[0065] Specifically, the electronic lock power supply terminal includes a K1 terminal with a locked status signal and a K2 terminal with an unlocked status signal. The electronic lock feedback terminal is a locked or unlocked status signal provided inside the charging gun electronic lock. The status signal is given to the controller after passing through a third signal isolation circuit (such as an optocoupler, digital isolation signal and other devices).

[0066] In some embodiments, the electronic lock feedback terminal provides status signal feedback of the electronic lock of the charging gun. When the charging gun is inserted into the vehicle interface, the micro switch of the feedback signal of the electronic lock feedback terminal is in a closed state, which indicates that the charging gun is locked normally. The status of the electronic lock feedback terminal needs to be uploaded to the first control module, and the first control module performs the next instruction. The communication module forms a high-frequency carrier signal after modulation by the modem, and the coupler in the communication module couples this high-frequency carrier signal to the power line communication terminal for transmission. The coupler of the control module decouples this high-frequency carrier signal from the power line communication terminal, and then restores the original data information through the modem on the control module end, and then passes the original data information to the control module for judgment.

[0067] In some embodiments, the charging gun is also provided with a CAN signal terminal, the communication module further includes a CAN transceiver, the CAN signal terminal is connected to the controller via the CAN transceiver; the controller communicates with the vehicle's BMS via the CAN signal terminal.

[0068] Specifically, the CAN signal terminal includes a positive S+ terminal and a negative S- terminal. The electronic lock feedback terminal is a locked or unlocked status signal provided inside the charging gun electronic lock. The status signal is given to the controller after passing through a third signal isolation circuit (such as an optocoupler, digital isolation signal and other devices).

[0069] The CAN signal terminal is the CAN signal for communication between the MCU and the vehicle BMS (battery management system). The CAN signal terminal is connected to the isolated CAN transceiver chip and is powered by a DC / DC isolated power supply, so that the controller is electrically isolated from the CAN signal terminal. The purpose of isolation is to improve communication reliability.

[0070] The CAN signal terminal is for charging communication, and the control module communicates with the vehicle BMS through the CAN signal terminal. The communication method is CAN bus communication, with a maximum communication rate of 500kbps. The signal transmission adopts differential mode, which can achieve long-distance communication. The CAN communication between the control module and the communication module also adopts the power carrier mode.

[0071] In some embodiments, the charging gun is further provided with a temperature acquisition terminal, and the communication module further includes a signal processing circuit and a fourth signal isolation circuit; the temperature acquisition terminal, the signal processing circuit, the fourth signal isolation circuit and the controller are connected in sequence;

[0072] The temperature acquisition terminal is used to detect the temperature signal at the charging gun head;

[0073] The signal processing circuit is used to amplify the temperature signal and send the amplified temperature signal to the controller through the fourth signal isolation circuit, and the controller converts the amplified temperature signal into a digital value.

[0074] Specifically, the temperature acquisition terminal can use a PT1000 type platinum resistor to acquire the temperature signal at the tip of the charging gun; the T1+ terminal is the positive temperature signal acquisition terminal, the T2+ terminal is the negative temperature signal acquisition terminal, and the T- terminal is the common terminal of the two temperature probes; the signals of the T1+ terminal and the T2+ terminal are relatively weak, and are amplified by the signal processing circuit and given to the controller through the fourth signal isolation circuit (such as an isolation amplifier, a linear optocoupler, etc.), and the analog quantity acquired by the controller is converted into a digital quantity.

[0075] When the control module detects that the charging gun is over-temperature, it will reduce power or shut down. Therefore, the data of the T1+ terminal, T- terminal and T2+ terminal need to be uploaded to the control module through the communication module.

[0076] In some embodiments, the charging gun is further provided with a connection confirmation terminal, and the communication module further includes a fifth signal isolation circuit; the connection confirmation terminal is connected to the controller through the fifth signal isolation circuit;

[0077] The connection confirmation terminal is used to detect the connection confirmation signal between the charging gun and the vehicle socket. The connection confirmation signal passes through the fifth signal isolation circuit and is sent to the controller, which converts the connection confirmation signal into a digital quantity.

[0078] Specifically, the connection confirmation terminal provides a connection confirmation signal between the charging gun and the vehicle socket. The connection confirmation signal exists in 4V, 6V, and 12V states. The connection confirmation signal is given to the controller through the fifth signal isolation circuit (such as an isolation amplifier, linear optocoupler, etc.), and the controller collects the analog quantity and converts it into a digital quantity; since the signal forms a loop with the casing earth PE, the circuit is powered by an isolated DC / DC power supply.

[0079] The charging connection confirmation method of the connection confirmation terminal is: when the charging gun is inserted into the vehicle interface, there will be a voltage change at the connection confirmation terminal. The conventional solution is to design the circuit of the connection confirmation terminal to the control module, so that a cable connection must be used to detect the voltage change for judgment. The present invention designs the circuit of the connection confirmation terminal to the communication module, that is, inside the charging gun. In this way, the communication module can obtain the voltage change of the connection confirmation terminal when the gun is inserted or removed, and then transmit it to the control module through the power carrier for the next step of instruction. That is, the communication module end forms a high-frequency carrier signal after modulation by the modem, and the coupler at the communication module end couples this high-frequency carrier signal to the power line communication terminal for transmission. The coupler at the control module end decouples the signal from the power line communication terminal, and then restores the original data information through the modem at the control module end, and then transmits the original data information to the control module for judgment.

[0080] In this embodiment, the 12 cables between the charging gun and the control module of the charging pile are reduced to 2 cables, which greatly reduces the workload of assembly and the defective rate of the product. The charging gun is a consumable part. During the later after-sales maintenance, the workload is greatly reduced when changing the gun line. The most important thing is to reduce the possibility of disconnection. The 10 cables that are reduced are all 0.75mm2. They are also the 10 most fragile cables.

[0081] The present invention adopts power line carrier communication to solve the communication problem between the charging gun and the control module. The innovation of the present invention is to realize the transmission of information based on the DC cable of the auxiliary power supply, reduce the number of cables, and ensure that the communication of the charging pile meets the national standard requirements.

[0082] During use, the AC power has 50HZ and 60HZ, and its cycle is 20ms and 16.7ms. In each AC cycle, there are two peaks, which will bring two pulse interferences, that is, there is a fixed 100HZ or 120HZ pulse interference on the power line, and the interference time is about 2ms, so the interference must be processed. Therefore, the present invention chooses to use DC cables instead of AC cables to realize information transmission.

[0083] Compared with the prior art, the present invention has the following advantages:

[0084] The present invention adopts a power carrier mode to transmit charging gun signals. Each charging gun only needs to be connected to 5 cables instead of 15 cables originally, which greatly reduces the number of cables and makes the layout of the charging pile simpler.

[0085] The present invention adopts a power carrier mode to transmit the charging gun signal, which reduces the risk of signal line breakage and reduces the failure points of the charging pile.

[0086] The present invention adopts the power carrier mode to transmit the charging gun signal, which reduces the workload of production, assembly and after-sales, and reduces the labor cost of the pile.

[0087] refer to Figure 2 The embodiment of the present invention provides a DC charging pile internal communication method, which is applied to the DC charging pile internal communication system described in any one of the above embodiments, and the method comprises the following steps:

[0088] S100, the controller obtains first data information sent by the low-voltage auxiliary power terminal, and sends the obtained first data information to the carrier module;

[0089] S200, the carrier module modulates the first data information into a first high-frequency carrier signal and couples it to the power line communication terminal for transmission, and after receiving a second high-frequency carrier signal, demodulates the second high-frequency carrier signal into second data information and sends it to the controller;

[0090] S300, a filter filters a high-frequency carrier signal loaded in the current transmitted from the power line communication terminal, and shunts the current to the low-voltage auxiliary power supply terminal and the DC / DC isolation power supply;

[0091] S400, the DC / DC isolation power supply converts the voltage shunted by the filter into a power supply voltage for the controller.

[0092] It can be seen that the contents of the above system embodiments are all applicable to the present method embodiments, the functions specifically implemented by the present method embodiments are the same as those of the above system embodiments, and the beneficial effects achieved are also the same as those achieved by the above system embodiments.

[0093] It should be understood that in the present application, the terms "include" and "have" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units need not be limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. "At least one (item)" refers to one or more, and "plurality" refers to two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist, for example, "A and / or B" can represent: only A exists, only B exists, and A and B exist at the same time, wherein A, B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in a "or" relationship. "At least one of the following (individuals)" or similar expressions thereof refer to any combination of these items, including any combination of singular (individuals) or plural (individuals). For example, at least one item among a, b or c can be represented by: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or plural.

[0094] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0095] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but the scope of the rights of the present invention is not limited thereto. Any modification, equivalent substitution and improvement made by a person skilled in the art without departing from the scope and essence of the present invention should be within the scope of the rights of the present invention.

Claims

1. A DC charging pile internal communication system, characterized in that: The system comprises: a communication module arranged on the charging gun and a control module arranged on the charging pile; the communication module comprises a controller, a DC / DC isolation power supply, a filter and a carrier module; The charging gun is also provided with a low-voltage auxiliary power terminal and a power line communication terminal; the power line communication terminal of the charging gun is connected to the control module through a power line; the low-voltage auxiliary power terminal is used to connect to the BMS of the vehicle; The power line communication terminal is respectively connected to the input end of the filter and one end of the carrier module; the other end of the carrier module is connected to the controller; one output end of the filter is connected to the low-voltage auxiliary power supply terminal, and the other output end is connected to the controller through a DC / DC isolation power supply; The controller is used to obtain the first data information sent by the low-voltage auxiliary power terminal, and send the obtained first data information to the carrier module; and is used to receive the second data information sent by the carrier module; The carrier module is used to modulate the first data information into a first high-frequency carrier signal and then couple it to the power line communication terminal for transmission, and is used to demodulate the second high-frequency carrier signal into second data information after receiving the second high-frequency carrier signal and send it to the controller; The filter is used to filter the high-frequency carrier signal loaded in the current transmitted from the power line communication terminal, and shunt the current to the low-voltage auxiliary power supply terminal and the DC / DC isolation power supply; The DC / DC isolation power supply is used to convert the voltage shunted by the filter into the power supply voltage of the controller.

2. The system according to claim 1, characterized in that The communication module further includes a first signal isolation circuit, and the low-voltage auxiliary power terminal is connected to the controller via the first signal isolation circuit.

3. The system according to claim 1, characterized in that The communication module includes a relay, which is connected between an output end of the filter and the low-voltage auxiliary power supply terminal; the controller is connected to the coil terminal of the relay; the controller is also used to control the on and off of the relay to control the on and off of the path between the low-voltage auxiliary power supply terminal and the power line communication terminal.

4. The system according to claim 1, characterized in that The charging gun is also provided with an electronic lock power supply terminal, and the communication module further includes a drive circuit and a second signal isolation circuit; the electronic lock power supply terminal, the drive circuit, the second signal isolation circuit and the controller are connected in sequence; The controller is also used to send an electronic lock control signal, which passes through the second signal isolation circuit and then the drive circuit to the electronic lock power supply terminal to control the electronic lock of the charging gun to lock or unlock.

5. The system according to claim 4, characterized in that The charging gun is also provided with an electronic lock feedback terminal, and the communication module further includes a third signal isolation circuit; the electronic lock feedback terminal is connected to the controller via the third signal isolation circuit; The electronic lock feedback terminal is used to detect the electronic lock status signal. The electronic lock status signal is sent to the controller after passing through the third signal isolation circuit to feedback the status of the charging gun electronic lock as locked or unlocked.

6. The system according to claim 1, characterized in that The charging gun is also provided with a CAN signal terminal, and the communication module also includes a CAN transceiver. The CAN signal terminal is connected to the controller via the CAN transceiver; the controller communicates with the BMS of the vehicle via the CAN signal terminal.

7. The system according to claim 1, characterized in that The charging gun is also provided with a temperature acquisition terminal, and the communication module further includes a signal processing circuit and a fourth signal isolation circuit; the temperature acquisition terminal, the signal processing circuit, the fourth signal isolation circuit and the controller are connected in sequence; The temperature acquisition terminal is used to detect the temperature signal at the charging gun head; The signal processing circuit is used to amplify the temperature signal and send the amplified temperature signal to the controller through the fourth signal isolation circuit, and the controller converts the amplified temperature signal into a digital value.

8. The system according to claim 1, characterized in that The charging gun is further provided with a connection confirmation terminal, and the communication module further includes a fifth signal isolation circuit; the connection confirmation terminal is connected to the controller via the fifth signal isolation circuit; The connection confirmation terminal is used to detect the connection confirmation signal between the charging gun and the vehicle socket. The connection confirmation signal passes through the fifth signal isolation circuit and is sent to the controller, which converts the connection confirmation signal into a digital quantity.

9. A DC charging pile internal communication method, characterized in that: Applied to the internal communication system of a DC charging pile according to any one of claims 1 to 8, the method comprises the following steps: S100, the controller obtains first data information sent by the low-voltage auxiliary power terminal, and sends the obtained first data information to the carrier module; S200, the carrier module modulates the first data information into a first high-frequency carrier signal and couples it to the power line communication terminal for transmission, and after receiving a second high-frequency carrier signal, demodulates the second high-frequency carrier signal into second data information and sends it to the controller; S300, a filter filters a high-frequency carrier signal loaded in the current transmitted from the power line communication terminal, and shunts the current to the low-voltage auxiliary power supply terminal and the DC / DC isolation power supply; S400, the DC / DC isolation power supply converts the voltage shunted by the filter into a power supply voltage for the controller.

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