Direct current charging pile internal communication system

Abstract

The utility model relates to the technical field of energy storage charging, in particular to a direct current charging pile internal communication system which comprises a communication board arranged in a charging gun and a main control board arranged in a charging pile. A power line communication terminal of the charging gun is connected with the main control board through a power line; the first 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 first 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 first 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 and charging technology, and in particular to an internal communication system of a DC charging pile. Background Art

[0002] As electric vehicles become more and more widely used, the charging guns used to charge electric vehicles have more and more functions, and the corresponding connection harnesses are also increasing. For example, according to the current standard, there are 24 signal lines between the main control board and the charging gun of a dual-gun charging pile, which is a very large number. 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 cause disconnection during assembly and wiring. In addition, too many signal lines in the charging gun can easily cause wiring errors, which increases the rejection rate of production.

[0003] As can be seen, in related technologies, charging piles contain hundreds of cables. This excessive number of cables makes troubleshooting and routing difficult. Reducing the number of cables within charging piles, reducing costs while simplifying the internal layout, is a challenge that every charging pile manufacturer currently faces. Summary of the Invention

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

[0005] An embodiment of the present invention provides an internal communication system for a DC charging pile, comprising: a communication board provided on a charging gun and a main control board provided on the charging pile; the communication board includes a first controller, a DC / DC isolation power supply, a filter, and a first carrier module; the first carrier module includes a first coupler and a first modem;

[0006] The charging gun is further provided with a first low-voltage auxiliary power supply terminal and a first power line communication terminal, and is further provided with a second power line communication terminal; the first power line communication terminal and the second power line communication terminal are connected via a power line, and the second power line communication terminal is also connected to the main control board; the first low-voltage auxiliary power supply terminal is used to connect to the vehicle's BMS;

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

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

[0009] The first modem is configured to modulate the first data information into a first high-frequency carrier signal and send the signal to the first coupler, and receive the second data information sent by the first coupler and send the signal to the first controller;

[0010] The first coupler is configured to couple the first high-frequency carrier signal to the power line and transmit the signal to the main control board via the first power line communication terminal, and to decouple the second high-frequency carrier signal from the power line, demodulate the second high-frequency carrier signal into second data information, and transmit the second data information to the first modem;

[0011] The filter is configured to filter the first high-frequency carrier signal carried in the current transmitted from the first power line communication terminal, and shunt the current to the first low-voltage auxiliary power terminal and the DC / DC isolated power supply;

[0012] The DC / DC isolated power supply is used to convert the voltage shunted by the filter into the power supply voltage of the first controller.

[0013] Optionally, the communication board further includes a photoelectric coupler connected between the first controller and the first low-voltage auxiliary power terminal.

[0014] Optionally, the communication board includes a relay, which is connected between an output end of the filter and the low-voltage auxiliary power supply terminal; the first controller is connected to the coil terminal of the relay; the first 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.

[0015] Optionally, the charging gun is further provided with an electronic lock power supply terminal, and the communication board further includes a drive circuit and a first signal isolation circuit; the electronic lock power supply terminal, the drive circuit, the first signal isolation circuit and the first controller are connected in sequence;

[0016] The first controller is also used to send an electronic lock control signal. After passing through the first signal isolation circuit, the electronic lock control signal is given to the electronic lock power supply terminal through the drive circuit to control the electronic lock of the charging gun to lock or unlock.

[0017] Optionally, the charging gun is further provided with an electronic lock feedback terminal, and the communication board further includes a second signal isolation circuit; the electronic lock feedback terminal is connected to the first controller via the second signal isolation circuit;

[0018] The electronic lock feedback terminal is used to detect an electronic lock status signal. After passing through the second signal isolation circuit, the electronic lock status signal is sent to the first controller to feedback whether the status of the charging gun electronic lock is locked or unlocked.

[0019] Optionally, the charging gun is further provided with a CAN signal terminal, and the communication board further includes a CAN transceiver. The CAN signal terminal is connected to the first controller via the CAN transceiver; the first controller communicates with the vehicle's BMS via the CAN signal terminal.

[0020] Optionally, the charging gun is further provided with a temperature acquisition terminal, and the communication board further includes a signal processing circuit and a third signal isolation circuit; the temperature acquisition terminal, the signal processing circuit, the third signal isolation circuit and the first controller are connected in sequence;

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

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

[0023] Optionally, the charging gun is further provided with a connection confirmation terminal, and the communication board further includes a fourth signal isolation circuit; the connection confirmation terminal is connected to the first controller through the fourth signal isolation circuit;

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

[0025] Optionally, the main control board includes a second controller and a second carrier module, and the second carrier module includes a second coupler and a second modem;

[0026] The second power line communication terminal is connected to one end of the second coupler, and the other end of the second coupler is connected to the second controller via a second modem;

[0027] The second controller is configured to send the second data information to the second modem, and to receive the first data information sent by the second modem;

[0028] The second modem is configured to modulate the second data information into a second high-frequency carrier signal and send the signal to the second coupler, and receive the first data information sent by the second coupler and send the signal to the second controller;

[0029] The second coupler is used to couple the second high-frequency carrier signal to the power line and send it to the communication board through the second power line communication terminal, and is used to decouple the first high-frequency carrier signal from the power line, demodulate the first high-frequency carrier signal into first data information, and send it to the second modem.

[0030] The embodiments of the present invention include the following beneficial effects: The internal communication system of the DC charging pile provided in this embodiment transmits the charging gun signal by using a power carrier method, separates the high-frequency carrier signal loaded in the current through a filter, and diverts the current to the low-voltage auxiliary power terminal and the DC / DC isolation power supply, thereby respectively powering the charging gun and the first controller; modulates the first data information into a first high-frequency carrier signal through a carrier module and couples it to the power line communication terminal, and transmits the first high-frequency carrier signal to the second controller via power line communication, thereby realizing a communication connection between the charging gun and the charging pile. The present invention simultaneously realizes the functions of power supply and communication, reducing 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 following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

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

[0033] Figure 2 yes Figure 1 The connection diagram of the communication board. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

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

[0036] First, let’s analyze several nouns involved in the invention:

[0037] PLC, short for Power Line Communication, is a communication method that uses power lines as a data transmission medium. PLC involves modulating the data at the transmitting end through a modem to form a high-frequency carrier signal. A coupler at the transmitting end couples this high-frequency carrier signal onto the power line for transmission. A coupler at the receiving end decouples the signal from the power line, and the receiving modem recovers the original data. This data is then transmitted to the receiving source, completing the information transmission.

[0038] Based on operating frequency, power line carrier communication can be categorized as narrowband power line carrier (NB-PLC) and broadband power line carrier (BB-PLC). Currently, the maximum transmission distance of broadband carrier modules at a transmission rate of 250 kbps is 1 km, far exceeding the transmission distance of CAN communications.

[0039] like Figure 1 and Figure 2 As shown, Figure 1 An embodiment of the present invention provides an internal communication system for a DC charging pile, comprising: a communication board 100 provided on a charging gun and a main control board 200 provided on the charging pile; the communication board 100 includes a first controller 110, a DC / DC isolation power supply 120, a filter 130, and a first carrier module 140; the first carrier module 140 includes a first coupler 141 and a first modem 142;

[0040] The charging gun is further provided with a first low-voltage auxiliary power terminal 151 and a first power line communication terminal 152, and the charging pile is further provided with a second low-voltage auxiliary power terminal 221 and a second power line communication terminal 222; the first power line communication terminal 152 and the second power line communication terminal 222 are connected via a power line; the first low-voltage auxiliary power terminal 151 is used to connect to the vehicle's BMS to supply power to the vehicle's BMS;

[0041] In some embodiments, the main control board 200 corresponds to the communication board 100, the main control board 200 includes a second controller and a second carrier module 210, the second carrier module 210 includes a second coupler 211 and a second modem 212; the first power line communication terminal 152 of the charging gun is connected to the second power line communication terminal 222 of the charging pile through a power line.

[0042] The first power line communication terminal 152 is respectively connected to the input end of the filter 130 and one end of the first coupler 141; the other end of the first modem 142 is connected to the first controller 110 through the first modem 142; one output end of the filter 130 is connected to the first low-voltage auxiliary power supply terminal 151, and the other output end is connected to the first controller 110 through the DC / DC isolation power supply 120;

[0043] Specifically, the first low-voltage auxiliary power terminal 151 includes a positive A+ terminal and a negative A- terminal, and the first power line communication terminal 152 includes a positive V+ terminal and a negative V- terminal; the first controller 110 is connected to the first carrier module 140 signal through a serial port, and the serial port includes a receiving port (RX port for receiving signals) and a transmitting port (TX port for transmitting signals); the first low-voltage auxiliary power terminal 151 is connected to the optocoupler 161, and the output status of the vehicle BMS is fed back to the first controller 110 in the form of first data information.

[0044] The first controller 110 is configured to obtain first data information sent by the first low-voltage auxiliary power terminal 151 and send the obtained first data information to the first modem 142;

[0045] The first modem 142 is configured to modulate the first data information into a first high-frequency carrier signal and send the signal to the first coupler 141 , and receive the second data information sent by the first coupler 141 and send the signal to the first controller 110 ;

[0046] The first coupler 141 is configured to couple the first high-frequency carrier signal to the power line and transmit the signal to the main control board 200 via the first power line communication terminal 152, and to decouple the second high-frequency carrier signal from the power line, demodulate the second high-frequency carrier signal into second data information, and transmit the second data information to the first modem 142.

[0047] Specifically, after the first data information is modulated into a first high-frequency carrier signal through the first modem 142, it is coupled to the power line between the filter 130 and the first power line communication terminal 152 through the first coupler 141, thereby sending the first data information to the first controller 110 through the first power line communication terminal 152; after the second high-frequency carrier signal is decoupled from the power line through the first coupler 141, the second high-frequency carrier signal is demodulated into second data information through the first modem 142 and sent to the first controller 110, thereby realizing two-way communication between the first controller 110 and the second controller.

[0048] The filter 130 is configured to filter the first high-frequency carrier signal carried in the current transmitted from the first power line communication terminal 152 and divert the current to the first low-voltage auxiliary power terminal 151 and the DC / DC isolation power supply 120 ;

[0049] The DC / DC isolation power supply 120 is used to convert the voltage shunted by the filter 130 into a power supply voltage for the first controller 110 .

[0050] Specifically, the first power line communication terminal 152 receives the current loaded with a high-frequency carrier signal transmitted by the charging pile. After passing through the filter 130 to block the high-frequency carrier signal, one path is passed through the relay 162 and then supplied to the first low-voltage auxiliary power supply terminal 151 of the charging gun to provide auxiliary power supply for the vehicle, and the other path is supplied to the DC / DC isolation power supply 120 to provide power for the first controller 110 and surrounding circuits; therefore, the first power line communication terminal 152 has the functions of power supply and communication.

[0051] In this embodiment, the first low-voltage auxiliary power terminal 151 is used to wake up the vehicle's BMS and provide power. The communication board 100 provides 12V power to the charging cable's first low-voltage auxiliary power terminal 151, which is time-controlled by the first controller 110. The first data signal is modulated by the first modem 142 to form a first high-frequency carrier signal.

[0052] The first carrier module 140 includes a first coupler 141 and a first modem 142. The first coupler 141 in the first carrier module 140 at the transmitting end (charging gun) couples the first high-frequency carrier signal to the first power line communication terminal 152 for transmission. The second coupler 211 in the second carrier module 210 at the receiving end (charging station) decouples the first high-frequency carrier signal from the second power line communication terminal 222, and then restores the original first data information through the second modem 212 in the second carrier module 210. The original second data information is then transmitted to the first low-voltage auxiliary power terminal 151 of the charging gun to complete the control of the charging gun.

[0053] It should be noted that the present invention incorporates a communication board 100 within the charging gun and a main control board 200 within the charging station to enable the loading, modulation, and demodulation of high-frequency carrier signals. In practice, two 2.5mm² cables connect the communication board 100 and the main control board 200, providing a 12V power supply to the communication board 100. As long as the first low-voltage auxiliary power terminal 151 is conductive, the power supply circuit remains open.

[0054] In some embodiments, the communication board 100 further includes a photocoupler 161 , which is connected between the first controller 110 and the first low-voltage auxiliary power terminal 151 .

[0055] Specifically, the anode of the photocoupler 161 is connected to the negative terminal A- of the first low-voltage auxiliary power supply terminal 151 via a first resistor, the cathode of the photocoupler 161 is connected to the positive terminal A+ of the first low-voltage auxiliary power supply terminal 151, the collector of the photocoupler 161 is connected to the first controller 110, and the emitter of the photocoupler 161 is grounded. The first low-voltage auxiliary power supply terminal 151 converts the output state of the vehicle's BMS into first data information through the photocoupler 161 and then feeds it back to the first controller 110.

[0056] In some embodiments, the communication board 100 includes a relay 162 , the relay 162 being connected between an output terminal of the filter 130 and the first low-voltage auxiliary power terminal 151 ; the first controller 110 being connected to a coil terminal of the relay 162 ;

[0057] The first controller 110 is further configured to control the on / off switching of the relay 162 , so as to control the on / off switching of the path between the first low-voltage auxiliary power terminal 151 and the first power line communication terminal 152 .

[0058] Specifically, the coil terminal of the relay 162 is controlled by the first controller 110 (not marked in the figure). The first controller 110 controls the on and off of the relay 162, thereby controlling the path between the first low-voltage auxiliary power terminal 151 and the first power line communication terminal 152, thereby realizing charging control of the vehicle's BMS.

[0059] In some embodiments, the charging gun is further provided with an electronic lock power supply terminal 153, and the communication board 100 further includes a drive circuit 163 and a first signal isolation circuit 164; the electronic lock power supply terminal 153, the drive circuit 163, the first signal isolation circuit 164 and the first controller 110 are connected in sequence;

[0060] The first controller 110 is also used to send an electronic lock control signal. After passing through the first signal isolation circuit 164, the electronic lock control signal is sent to the electronic lock power supply terminal 153 through the drive circuit 163 to control the electronic lock of the charging gun to lock or unlock.

[0061] Specifically, the electronic lock power supply terminal 153 includes a positive W+ terminal and a negative W- terminal. The electronic lock power supply terminal 153 is connected to the power supply circuit of the charging gun electronic lock. After the first controller 110 sends the charging gun electronic lock control signal, it passes through the first signal isolation circuit 164 (such as an optical coupler, digital isolation signal device, etc.) and then passes through the drive circuit 163 to the electronic lock power supply terminal 153 to control the locking or unlocking of the charging gun electronic lock.

[0062] In some embodiments, the charging gun is further provided with an electronic lock feedback terminal 155, and the communication board 100 further includes a second signal isolation circuit 166; the electronic lock feedback terminal 155 is connected to the first controller 110 through the second signal isolation circuit 166;

[0063] The electronic lock feedback terminal 155 is used to detect the electronic lock status signal. After passing through the second signal isolation circuit 166, the electronic lock status signal is sent to the first controller 110 to feedback whether the status of the charging gun electronic lock is locked or unlocked.

[0064] Specifically, the electronic lock feedback terminal 155 includes a K1 terminal with a locked status signal and a K2 terminal with an unlocked status signal. The electronic lock feedback terminal 155 is a locked or unlocked status signal provided by the charging gun's electronic lock. The electronic lock feedback terminal 155 provides status signal feedback of the charging gun's electronic lock. When the charging gun is plugged into the vehicle interface, the microswitch of the electronic lock feedback terminal 155 feedback signal is closed, indicating that the charging gun is normally locked. The status of the electronic lock feedback terminal 155 needs to be uploaded to the first controller 110. This status signal passes through the second signal isolation circuit 166 (such as an optocoupler, digital isolation signal, etc.) and is then given to the first controller 110 so that the first controller 110 can take the next instruction.

[0065] In some embodiments, the charging gun is further provided with a CAN signal terminal 154, and the communication board 100 further includes a CAN transceiver 165. The CAN signal terminal 154 is connected to the first controller 110 through the CAN transceiver 165; the first controller 110 communicates with the vehicle's BMS through the CAN signal terminal 154.

[0066] Specifically, the CAN signal terminal 154 includes a positive S+ terminal and a negative S- terminal. The CAN signal terminal 154 is a CAN signal for communication between the MCU and the vehicle's BMS (battery management system). The CAN signal terminal 154 is connected to the isolated CAN transceiver 165 and is powered by the DC / DC isolation power supply 120, so that the first controller 110 is electrically isolated from the CAN signal terminal 154. The purpose of isolation is to improve communication reliability. The CAN signal terminal 154 is for charging communication, and the first controller 110 communicates with the vehicle's BMS through the CAN signal terminal 154. The communication method is CAN bus communication, which can achieve a maximum communication rate of 500kbps. The signal transmission adopts a differential method, which can achieve longer distance communication. The CAN communication between the main control board 200 and the communication board 100 also adopts a power carrier method.

[0067] In some embodiments, the charging gun is further provided with a temperature acquisition terminal 156, and the communication board 100 further includes a signal processing circuit 167 and a third signal isolation circuit 168; the temperature acquisition terminal 156, the signal processing circuit 167, the third signal isolation circuit 168 and the first controller 110 are connected in sequence;

[0068] The temperature acquisition terminal 156 is used to detect the temperature signal at the charging gun tip;

[0069] The signal processing circuit 167 is used to amplify the temperature signal and send the amplified temperature signal to the first controller 110 through the third signal isolation circuit 168. The first controller 110 converts the amplified temperature signal into a digital value.

[0070] Specifically, the temperature acquisition terminal 156 can use a PT1000 type platinum resistor to collect 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 end 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 167 and given to the first controller 110 through the third signal isolation circuit 168 (such as an isolation amplifier, a linear optocoupler, etc.), and the analog quantity collected by the first controller 110 is converted into a digital quantity.

[0071] When the main control board 200 detects that the charging gun is overheated, it will reduce power or shut down the device. Therefore, the data of the T1+ terminal, T- terminal, and T2+ terminal must be uploaded to the main control board 200 through the communication board 100.

[0072] In some embodiments, the charging gun is further provided with a connection confirmation terminal 157, and the communication board 100 further includes a fourth signal isolation circuit 169; the connection confirmation terminal 157 is connected to the first controller 110 through the fourth signal isolation circuit 169;

[0073] The connection confirmation terminal 157 is used to detect the connection confirmation signal between the charging gun and the vehicle socket. The connection confirmation signal passes through the fourth signal isolation circuit 169 and is sent to the first controller 110, which converts the connection confirmation signal into a digital quantity.

[0074] Specifically, the connection confirmation terminal 157 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 first controller 110 through the fourth signal isolation circuit 169 (such as an isolation amplifier, a linear optocoupler, etc.), and the first controller 110 collects the analog quantity and converts it into a digital quantity; since the signal forms a loop with the casing ground PE, the circuit is powered by an isolated DC / DC power supply.

[0075] The charging connection confirmation method for connection confirmation terminal 157 is as follows: when the charging plug is plugged into the vehicle interface, a voltage change occurs at connection confirmation terminal 157. Conventional solutions typically integrate the circuitry for connection confirmation terminal 157 into the main control board 200, requiring a separate cable connection to detect the voltage change and make a determination. The present invention integrates the circuitry for connection confirmation terminal 157 into the charging plug. This allows the communication board 100 to detect the voltage change during connection confirmation terminal 157 insertion and removal, and then transmits it to the main control board 200 via a power line carrier for further instructions. Specifically, the first modem 142 in the communication board 100 modulates the signal into a high-frequency carrier signal, which is then coupled by the first coupler 141 to the first power line communication terminal 152 for transmission. The second coupler 211 in the main control board 200 decouples the signal from the second power line communication terminal 222, and the second modem 212 in the main control board 200 recovers the original data information, which is then transmitted to the main control board 200 for determination.

[0076] In some embodiments, the main control board 200 includes a second controller and a second carrier module 210 , and the second carrier module 210 includes a second coupler 211 and a second modem 212 ;

[0077] The second power line communication terminal 222 is connected to one end of the second coupler 211 , and the other end of the second coupler 211 is connected to the second controller via the second modem 212 ;

[0078] The second controller is configured to send the second data information to the second modem 212 and to receive the first data information sent by the second modem 212;

[0079] The second modem 212 is configured to modulate the second data information into a second high-frequency carrier signal and send the signal to the second coupler 211, and receive the first data information sent by the second coupler 211 and send the signal to the second controller;

[0080] The second coupler 211 is used to couple the second high-frequency carrier signal to the power line and send it to the communication board 100 through the second power line communication terminal 222, and is used to decouple the first high-frequency carrier signal from the power line, demodulate the first high-frequency carrier signal into first data information, and send it to the second modem 212.

[0081] In this embodiment, the 12 cables between the charging gun and the charging pile's main control board 200 are reduced to two, significantly reducing assembly workload and product defect rates. The charging gun is a consumable part, significantly reducing the workload during after-sales maintenance and cable replacement. Most importantly, the possibility of cable breakage is reduced. The 10 cables removed are all 0.75 mm², making them the most fragile.

[0082] The present invention uses power line carrier communication to solve the communication problem between the charging gun and the main control board 200. The innovation of the present invention is to realize information transmission 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.

[0083] During use, AC power has 50Hz and 60Hz frequencies, with periods of 20ms and 16.7ms, respectively. Within each AC cycle, there are two peaks, each of which introduces two pulse interferences. This means that the power line experiences a fixed 100Hz or 120Hz pulse interference, lasting approximately 2ms. Therefore, this interference must be addressed. Therefore, the present invention utilizes DC cables rather than AC cables for information transmission.

[0084] Compared with the prior art, the present invention has the following advantages:

[0085] The present invention uses a power carrier to transmit charging gun signals. Each charging gun only needs to connect 5 cables instead of the original 15 cables, which greatly reduces the number of cables and makes the layout of the charging pile simpler.

[0086] 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.

[0087] 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.

[0088] It should be understood that in this application, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or that are 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 can exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, wherein A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following items" or similar expressions refer to any combination of these items, including any combination of single items or plural items. 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 multiple.

[0089] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0090] The preferred embodiments of the present invention are described above with reference to the accompanying drawings, but are not intended to limit the scope of the present invention. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and essence of the present invention should be within the scope of the present invention.

Claims

1. A DC charging pile internal communication system, characterized in that: The system comprises: a communication board (100) arranged on a charging gun and a main control board (200) arranged on a charging pile; the communication board (100) comprises a first controller (110), a DC / DC isolation power supply (120), a filter (130) and a first carrier module (140); the first carrier module (140) comprises a first coupler (141) and a first modem (142); The charging gun is further provided with a first low-voltage auxiliary power supply terminal (151) and a first power line communication terminal (152), and is further provided with a second power line communication terminal (222); the first power line communication terminal (152) and the second power line communication terminal (222) are connected via a power line, and the second power line communication terminal (222) is also connected to the main control board (200); the first low-voltage auxiliary power supply terminal (151) is used to connect to the vehicle's BMS; The first power line communication terminal (152) is respectively connected to the input end of the filter (130) and one end of the first coupler (141), and the other end of the first coupler (141) is connected to the first controller (110) via the first modem (142); one output end of the filter (130) is connected to the low-voltage auxiliary power supply terminal, and the other output end is connected to the first controller (110) via the DC / DC isolation power supply (120); The first controller (110) is configured to obtain first data information sent by the first low-voltage auxiliary power terminal (151), and send the obtained first data information to a first modem (142); The first modem (142) is used to modulate the first data information into a first high-frequency carrier signal and send the signal to the first coupler (141), and to receive the second data information sent by the first coupler (141) and send the signal to the first controller (110); The first coupler (141) is used to couple the first high-frequency carrier signal to the power line and send it to the main control board (200) through the first power line communication terminal (152); and is used to decouple the second high-frequency carrier signal from the power line, demodulate the second high-frequency carrier signal into second data information, and send it to the first modem (142); The filter (130) is used to filter a first high-frequency carrier signal loaded in the current transmitted from the first power line communication terminal (152), and to shunt the current to the first low-voltage auxiliary power terminal (151) and the DC / DC isolation power supply (120); The DC / DC isolation power supply (120) is used to convert the voltage shunted by the filter (130) into a power supply voltage for the first controller (110).

2. The system according to claim 1, wherein: The communication board (100) further comprises a photoelectric coupler (161), wherein the photoelectric coupler (161) is connected between the first controller (110) and the first low-voltage auxiliary power terminal (151).

3. The system according to claim 1, wherein: The communication board (100) includes a relay (162), the relay (162) being connected between an output end of the filter (130) and the low-voltage auxiliary power supply terminal; the first controller (110) being connected to a coil terminal of the relay (162); The first controller (110) is further configured to control the on / off switching of the relay (162) to control the on / off switching of the path between the low-voltage auxiliary power terminal and the power line communication terminal.

4. The system according to claim 1, wherein: The charging gun is further provided with an electronic lock power supply terminal (153), and the communication board (100) further includes a drive circuit (163) and a first signal isolation circuit (164); the electronic lock power supply terminal (153), the drive circuit (163), the first signal isolation circuit (164) and the first controller (110) are connected in sequence; The first controller (110) is further configured to send an electronic lock control signal, which passes through a first signal isolation circuit (164) and then a drive circuit (163) before being fed to an electronic lock power supply terminal (153) 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 further provided with an electronic lock feedback terminal (155), and the communication board (100) further includes a second signal isolation circuit (166); the electronic lock feedback terminal (155) is connected to the first controller (110) via the second signal isolation circuit (166); The electronic lock feedback terminal (155) is used to detect an electronic lock status signal, and the electronic lock status signal is sent to the first controller (110) after passing through the second signal isolation circuit (166) to feedback whether the state of the charging gun electronic lock is locked or unlocked.

6. The system according to claim 1, wherein: The charging gun is further provided with a CAN signal terminal (154), and the communication board (100) further includes a CAN transceiver (165). The CAN signal terminal (154) is connected to the first controller (110) via the CAN transceiver (165); and the first controller (110) communicates with the vehicle's BMS via the CAN signal terminal (154).

7. The system according to claim 1, wherein: The charging gun is further provided with a temperature acquisition terminal (156), and the communication board (100) further includes a signal processing circuit (167) and a third signal isolation circuit (168); the temperature acquisition terminal (156), the signal processing circuit (167), the third signal isolation circuit (168) and the first controller (110) are connected in sequence; The temperature acquisition terminal (156) is used to detect the temperature signal at the charging gun head; The signal processing circuit (167) is used to amplify the temperature signal and send the amplified temperature signal to the first controller (110) through the third signal isolation circuit (168), and the first controller (110) converts the amplified temperature signal into a digital value.

8. The system according to claim 1, wherein: The charging gun is further provided with a connection confirmation terminal (157), and the communication board (100) further includes a fourth signal isolation circuit (169); the connection confirmation terminal (157) is connected to the first controller (110) via the fourth signal isolation circuit (169); The connection confirmation terminal (157) is used to detect a connection confirmation signal between the charging gun and the vehicle socket. The connection confirmation signal is sent to the first controller (110) after passing through the fourth signal isolation circuit (169), and the first controller (110) converts the connection confirmation signal into a digital quantity.

9. The system according to claim 1, wherein: The main control board (200) includes a second controller and a second carrier module (210), and the second carrier module (210) includes a second coupler (211) and a second modem (212); The second power line communication terminal (222) is connected to one end of the second coupler (211), and the other end of the second coupler (211) is connected to the second controller via a second modem (212); The second controller is configured to send second data information to a second modem (212), and to receive first data information sent by the second modem (212); The second modem (212) is used for modulating the second data information into a second high-frequency carrier signal and sending the signal to the second coupler (211), and receiving the first data information sent by the second coupler (211) and sending the signal to the second controller; The second coupler (211) is used to couple the second high-frequency carrier signal to the power line and send it to the communication board (100) via the second power line communication terminal (222), and is used to decouple the first high-frequency carrier signal from the power line, demodulate the first high-frequency carrier signal into first data information, and send it to the second modem (212).

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