A low-voltage AC charging device with flexible control function

Abstract

This application discloses a low-voltage AC charging device for distribution areas with flexible control functionality. This device addresses the problem of existing AC charging piles being unable to directly communicate with the intelligent integrated terminal of the distribution area by configuring a communication module including a wireless communication unit, an HPLC carrier communication unit, and an RS485 communication unit. By configuring a communication protocol processing unit with various mainstream communication protocols of the power industry built-in, it solves the problem of incompatibility between the power communication protocols of existing AC charging piles and the intelligent integrated terminal of the distribution area. Through an AC sampling execution module, the power consumption of the charging pile is monitored in real time, and the power consumption data is fed back to the intelligent integrated terminal of the distribution area in real time using the communication module and the communication protocol processing unit, solving the problem that existing AC charging piles cannot effectively monitor and statistically analyze charging data. Furthermore, by controlling the charging power of the AC charging device through the charging execution module, it effectively solves the problem that AC charging piles cannot dynamically adjust the charging power during the charging process.

Description

Technical Field

[0001] This application relates to the field of charging pile technology, and in particular to a low-voltage AC charging device with flexible control function. Background Technology

[0002] With increasing global awareness of environmental protection and rapid technological development, the electric vehicle (EV) industry has experienced explosive growth. As a clean energy mode of transportation, the widespread adoption and application of electric vehicles is of great significance for reducing greenhouse gas emissions and improving air quality. However, the charging activities of electric vehicles have brought unprecedented challenges to the operation and management of low-voltage power distribution networks.

[0003] During the purchase of electric vehicles, owners typically acquire convenient AC charging devices or install home AC charging piles in their private parking spaces to charge their vehicles at any time. However, due to a lack of effective external communication methods, the integrated terminal for distribution transformers on the low-voltage distribution network side struggles to effectively and in real-time regulate electric vehicle charging behavior within the transformer area. This disorderly charging behavior by users leads to significant randomness and fluctuations in the power load on the low-voltage distribution network side. This not only increases the risk of heavy overload and low voltage in the distribution transformer area but also complicates grid dispatch and control, severely impacting the safe and stable operation of the low-voltage distribution network.

[0004] In existing technologies, communication is typically achieved by installing an external communication device on the charging pile for communication relay, thereby enabling the integrated terminal in the charging area to control the charging behavior of the charging pile. This approach requires additional hardware, which is not only inconvenient for on-site installation but also results in complex functionality due to inconsistent communication protocols and interface types among different charging piles, making it impossible to achieve unified functionality. Especially for most private AC charging piles, which lack external data communication interfaces, even with external communication devices, effective communication with the charging pile cannot be achieved, hindering effective flexible control. The only remaining option is rigid control via external circuit breakers, but this approach offers a poor user experience. Summary of the Invention

[0005] This application provides a low-voltage AC charging device with flexible control function to achieve real-time and effective regulation of electric vehicle charging behavior, thereby improving user experience and the safe and stable operation of the low-voltage power distribution network.

[0006] To achieve the above objectives, the technical solution of this invention is as follows:

[0007] In a first aspect, embodiments of the present invention provide a low-voltage distribution area AC charging device with flexible control function, comprising: a communication module, a charging management module, an AC sampling execution module, and a charging execution module; the communication module is configured with a wireless communication unit, an HPLC carrier communication unit, and an RS485 communication unit for communicating with a low-voltage distribution area intelligent fusion terminal; the charging management module includes a communication protocol processing unit, an AC sampling data processing unit, and a charging control unit; wherein, the communication protocol processing unit is used to parse communication messages carrying control commands or query commands sent by the low-voltage distribution area intelligent fusion terminal, and transmit the parsing results to the AC sampling data processing unit or the charging control unit. The communication protocol processing unit supports multiple power communication protocols and can adaptively match different power communication protocols; the AC sampling data processing unit is used to calculate the power consumption of the charging device based on the charging voltage and current data of the charging device when a query command is received; the charging control unit is used to formulate the charging curve of the charging device based on the control command and the power consumption of the charging device when a control command is received; the AC sampling execution module is used to perform real-time digital sampling of the charging voltage and current of the charging device using current transformers and voltage transformers; the charging execution module is used to adjust the charging power of the electric vehicle using the PWM square wave duty cycle according to the charging curve to achieve dynamic and flexible adjustment.

[0008] In some possible implementations, the wireless communication unit and the HPLC carrier communication unit are detachable; the wireless communication unit uses Bluetooth, StarFlash, or LoRa wireless communication media to achieve wireless networking functionality, which can be used to supplement the communication when the HPLC carrier communication unit is not working properly.

[0009] In some possible implementations, the wireless communication unit can perform remote operation and maintenance of the device and firmware update operations through a wireless channel.

[0010] In some possible implementations, the charging management module also includes an information security unit, which uses a preset encryption algorithm to perform information security checks on the communication messages received by the communication module.

[0011] In some possible implementations, the charging management module also includes a device self-management unit, which is used to implement firmware upgrades, self-tests, and fault alarms for the charging device itself.

[0012] In some possible implementations, the communication protocol processing unit has multiple pre-set communication protocol libraries that can automatically identify and match mainstream power communication protocols in the market.

[0013] In some possible implementations, the charging device is a mobile AC charging station or a home AC charging station.

[0014] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0015] In this embodiment of the invention, a communication module comprising a wireless communication unit, an HPLC carrier communication unit, and an RS485 communication unit is configured to solve the problem that existing AC charging piles cannot directly communicate with the smart integrated terminal of the distribution area. A communication protocol processing unit is configured, incorporating various mainstream communication protocols of the power industry, to solve the problem that the power communication protocols of existing AC charging piles are incompatible with the smart integrated terminal of the distribution area. An AC sampling execution module monitors the power consumption of the charging pile in real time, and uses the communication module and communication protocol processing unit to feed the power consumption data back to the smart integrated terminal of the distribution area in real time, solving the problem that existing AC charging piles cannot effectively monitor and statistically analyze charging data. Furthermore, the charging execution module controls the charging power of the AC charging device, effectively solving the problem that AC charging piles cannot dynamically adjust the charging power during the charging process. Attached Figure Description

[0016] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the existing low-voltage charging piles in the distribution area;

[0018] Figure 2 A schematic diagram of a low-voltage AC charging device with flexible control function provided for the implementation of the present invention;

[0019] Figure 3 This is a schematic diagram of the communication module in an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of another structure of the low-voltage AC charging device with flexible control function in the embodiment of the invention.

[0021] Figure 5 This is a flowchart illustrating the operation of the charging management module in an embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the AC sampling execution module in an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0024] In the relevant descriptions of this embodiment, the terms "including," "containing," and "possessing" are all open terms and are generally understood to include but not be limited to; the term "at least one" is generally understood to mean one or more, where "multiple" refers to two or more; the term "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items, for example, "at least one of a, b, or c", or "at least one of a, b, and c", which can all mean: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can be single or multiple; the symbol "A / B" is used to describe the selection relationship of associated objects, generally indicating an "or" relationship.

[0025] In the following description of the embodiments, the terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms "a" and "the" as used in the embodiments of this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0026] Those skilled in the art should understand that, in the following description of the embodiments of this application, the sequence of numbers does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0027] Those skilled in the art will understand that the numerical ranges in the embodiments of this application should be understood to specifically disclose each intermediate value between the upper and lower limits of the range. Any stated value or intermediate value within a stated range, as well as any other stated value or each smaller range between intermediate values ​​within a range, are also included within this invention. The upper and lower limits of these smaller ranges may be independently included or excluded from the range.

[0028] Unless otherwise stated, the technical / scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. While this application describes only preferred methods and materials, any methods and materials similar or equivalent to those described herein may be used in the implementation or testing of this application. All references to this specification are incorporated by way of citation to disclose and describe the methods and / or materials associated with those references. In the event of any conflict with any incorporated reference, the content of this specification shall prevail.

[0029] To illustrate the technical solution of the present invention, specific embodiments are described below.

[0030] With increasing global awareness of environmental protection and rapid technological development, the electric vehicle (EV) industry has experienced explosive growth. As a clean energy mode of transportation, the widespread adoption and application of electric vehicles is of great significance for reducing greenhouse gas emissions and improving air quality. However, the charging activities of electric vehicles have brought unprecedented challenges to the operation and management of low-voltage power distribution networks.

[0031] During the purchase of electric vehicles, owners typically receive a convenient AC charging device or have a home AC charging station installed in their private parking space to charge their electric vehicles at any time. For example... Figure 1 As shown, Figure 1 See the structural diagram of the existing low-voltage substation charging piles. Figure 1 As shown, these AC charging piles generally consist of three parts: a power supply control device, an AC charging system, and a local maintenance communication interface. However, not all AC charging piles are equipped with a local maintenance communication interface, and even if they are, its function is limited to the maintenance of the charging pile itself. Furthermore, its local maintenance communication interface is usually provided for the manufacturer's use during maintenance, which requires disassembling the panel and cannot directly achieve external communication functions.

[0032] Due to the lack of effective external communication methods, the integrated terminals of low-voltage distribution networks struggle to effectively regulate electric vehicle charging behavior within their respective distribution areas in real time. Disorderly charging by users leads to significant randomness and fluctuations in the power load on the low-voltage distribution network side. This not only increases the risk of heavy overload and low voltage in the distribution areas but also complicates grid dispatch and control, severely impacting the safe and stable operation of the low-voltage distribution network.

[0033] In existing technologies, communication is typically achieved by installing an external communication device on the charging pile for communication relay, thereby enabling the integrated terminal in the charging area to control the charging behavior of the charging pile. This approach requires additional hardware, which is not only inconvenient for on-site installation but also results in complex functionality due to inconsistent communication protocols and interface types among different charging piles, making it impossible to achieve unified functionality. Especially for most private AC charging piles, which lack external data communication interfaces, even with external communication devices, effective communication with the charging pile cannot be achieved, hindering effective flexible control. The only remaining option is rigid control via external circuit breakers, but this approach offers a poor user experience.

[0034] Based on this, embodiments of the present invention provide a low-voltage AC charging device with flexible control function, which enables real-time and effective regulation of electric vehicle charging behavior, improves user experience and the safe and stable operation of the low-voltage power distribution network.

[0035] It should be noted that the charging devices described below are all portable mobile AC charging piles or household AC charging piles that cannot directly communicate with the smart converged terminals in the distribution area.

[0036] Figure 2 A schematic diagram of a low-voltage AC charging device with flexible control function provided for implementation of the present invention is shown below. Figure 2 As shown, the aforementioned low-voltage AC charging device with flexible control function may include: a communication module 21, a charging management module 22, an AC sampling execution module 23, and a charging execution module 24.

[0037] Among them, the communication module 21 is mainly responsible for external communication functions, such as Figure 3 This is a schematic diagram of the communication module in an embodiment of the present invention. See also... Figure 3 As shown, the communication module 21 is equipped with a wireless communication unit 211, an HPLC carrier communication unit 212, and an RS485 communication unit 213. The wireless communication unit 211, HPLC carrier communication unit 212, and RS485 communication unit 213 are physically connected to the processor via a serial port. Through the communication module 21, communication with the intelligent converged terminal of the low-voltage distribution area is achieved.

[0038] The wireless communication unit 211 is adaptable to various complex communication environments. It supports multiple wireless communication media such as Bluetooth, Starlink, and LoRa, allowing selection based on site conditions and requirements. It also enables wireless networking using protocols like WAPI and ZigBee. When the HPLC carrier communication unit 212 experiences communication disruptions due to reasons such as power line faults or signal interference, the wireless communication unit 211 can quickly fill the gap, ensuring continuous and stable data communication. This complementary mechanism significantly enhances the reliability and fault tolerance of the entire communication system. The HPLC carrier communication unit 212, also known as the high-speed power line carrier module, can achieve data communication using the power supply lines of a low-voltage power grid, eliminating the need for separate communication lines and thus saving construction costs and improving installation efficiency. Therefore, it can be used as the preferred communication medium for external communication.

[0039] In some embodiments, the wireless communication unit 211 and the HPLC carrier communication unit 212 are detachable. If a functional unit fails or requires an upgrade, it can be easily removed and replaced with a new or upgraded unit. This design not only shortens maintenance time and reduces maintenance costs, but also facilitates field replacement of communication modules, improving system flexibility and maintainability.

[0040] In some embodiments, the wireless communication unit 211 not only provides communication assurance and ensures communication efficiency when HPLC communication is blocked, but also enables remote operation and maintenance of the equipment via the wireless channel.

[0041] For example, in conjunction with mobile apps and mini-programs, it provides convenient channels for operation, maintenance, testing, and acceptance. Specifically, the mobile app provides maintenance personnel with a comprehensive service platform integrating operation, maintenance, testing, and acceptance. Through the connection of the wireless communication unit 211, maintenance personnel can obtain the charging station's operating status, equipment parameters, and alarm information in real time. This not only makes maintenance work more intuitive and efficient but also shortens the response and problem-solving time.

[0042] In some embodiments, the RS485 communication interface is a reserved communication interface that can be used for extended applications of subsequent devices. Through the RS485 interface, cascaded communication between different AC charging devices can be achieved, or the communication module 21 can be used to enable AC charging piles to directly log into a remote cloud platform, further enhancing the system's scalability and application flexibility.

[0043] The charging management module 22 is primarily responsible for data processing. The charging management module 22 includes a communication protocol processing unit 221, a cross-data processing unit 222, and a charging control unit 223; wherein:

[0044] The communication protocol processing unit 221 is used to parse the communication messages sent by the low-voltage distribution area intelligent fusion terminal carrying control instructions or query instructions, and transmit the parsing results to the data processing unit 222 or the charging control unit 223; wherein, the communication protocol processing unit 221 supports multiple power communication protocols and can adaptively match different power communication protocols;

[0045] The communication protocol processing unit 221 can parse communication messages sent by the intelligent converged terminal in the low-voltage distribution area. These messages may contain complex control commands, such as adjusting charging power or setting charging time, or they may contain query requests for equipment status or charging parameters. Through precise parsing, the communication protocol processing unit 221 can extract key information from the messages. After parsing, the communication protocol processing unit 221 will transmit the parsing results to the corresponding processing unit according to the type and content of the command. For control commands, they will be transmitted to the data acquisition and processing unit 222 for real-time adjustment of charging parameters; for query commands, they will be transmitted to the charging control unit 223 to obtain the real-time status of the equipment or charging parameters.

[0046] The communication protocol processing unit 221 has multiple pre-set communication protocol libraries, which can automatically identify and match mainstream power communication protocols in the market, including but not limited to DLT645, DLT698, DLMS, and other mainstream domestic and international communication protocols. This broad protocol support capability enables the system to easily cope with various complex communication environments and requirements, improving the system's compatibility and flexibility. Furthermore, this unit can adaptively match protocols based on their characteristics. When a new communication message is received, the communication protocol processing unit 221 automatically identifies and applies the most suitable communication protocol for the current message without manual intervention. This automatic adaptive matching capability not only simplifies the operation process but also improves the system's processing efficiency and accuracy.

[0047] The data processing unit 222 is used to calculate the power consumption of the charging device based on the charging voltage and current data of the charging device when a query command is received.

[0048] The data processing unit 222 can receive query commands from the communication protocol processing unit 221 in real time. These commands typically request the acquisition of real-time charging voltage and current data of the charging device. Once the command is received, the unit immediately initiates the data processing flow, acquiring the corresponding voltage and current data from the AC sampling execution module 23. Based on the acquired charging voltage and current data, the data processing unit 222 can use preset algorithms or mathematical models to calculate the power consumption of the charging device, mainly including information such as voltage, current, active power, reactive power, and cumulative power consumption. These calculation results not only reflect the working status of the charging device but also provide data support for subsequent energy efficiency analysis and optimization. Through the calculation of power consumption, the intelligent terminal in the distribution area can easily monitor the charging status of each AC charging pile in real time and, based on the overall power consumption of the distribution area, ultimately realize personalized charging management strategies for each charging device.

[0049] The charging control unit 223 is used to formulate a charging curve for the charging device based on the control command and the power consumption of the charging device when it receives a control command.

[0050] Specifically, the charging control unit 223 can receive control commands from the communication protocol processing unit 221 in real time. These commands may include adjusting charging power, setting charging time, and optimizing charging strategies. Once a command is received, the charging control unit 223 immediately parses it to clarify the specific control requirements. Based on the control commands and the real-time power consumption of the charging device (such as charging voltage, current, and power), the charging control unit 223 formulates the current actual charging curve using a preset algorithm or an existing mathematical model. This curve can describe in detail the changes of parameters such as power and current over time during the charging process, providing precise guidance for the subsequent charging process. According to the charging curve, the charging control unit 223 can flexibly adjust the charging parameters according to the control commands from the smart terminal in the charging station area and the actual charging status of the current charging pile, thereby achieving flexible control of the current charging process.

[0051] In some embodiments, see Figure 4 As shown, Figure 4 This is another structural schematic diagram of the low-voltage AC charging device with flexible control function in the embodiment of the invention; wherein, the charging management module 22 further includes an information security unit 224 and a device self-management unit 225.

[0052] The information security unit 224 is used to perform information security checks on the communication messages received by the communication module 21 using a preset encryption algorithm.

[0053] The information security unit 224 performs rigorous information security checks on all communication messages received by the communication module 21. The check process covers multiple dimensions, including data integrity, authenticity, and confidentiality, ensuring that only verified and authorized data can proceed to subsequent protocol processing. To address increasingly complex network security threats, the information security unit 224 can employ commonly used encryption algorithms in the field, such as public-key cryptography (SM2), cryptographic hashing (SM3), and block ciphers (SM4). Communication messages that pass the security check are forwarded to the communication protocol processing unit 221 for further protocol parsing; otherwise, they are discarded. The information security unit 224 ensures communication security and prevents unauthorized data intrusion by external users, thus avoiding security risks.

[0054] The device self-management unit 225 is used to realize firmware upgrade, operation self-test and fault alarm functions of the charging device itself.

[0055] The following describes the workflow of the charging management module 22 using a specific embodiment. For example, Figure 5 This is a flowchart illustrating the operation of the charging management module 22 in this embodiment of the invention. See also... Figure 5 As shown, after receiving a communication data frame, the communication module 21 first uses the information security unit 224 to perform trusted verification and decryption of the security information of the communication message data frame according to the information security algorithm. Verification methods include, but are not limited to, plaintext + MAC, ciphertext, and ciphertext + MAC. Communication messages that fail verification are discarded directly; those that pass verification are considered trusted communication and are handed over to the communication protocol processing unit 221 for protocol screening. The communication protocol processing unit 221 checks the communication message according to the characteristics of its respective protocol, identifying the current communication protocol type, such as DLT645, DLT698, DLMS, or other mainstream communication protocols. Based on the identification result, it calls the corresponding communication protocol library to parse the current communication message, defining the expected operation of the current communication, such as querying current charging information or flexibly adjusting the charging power.

[0056] If it is a flexible control operation, the control command is transmitted to the charging control unit 223. The charging control unit 223 calculates the desired charging curve based on the desired control value and the current charging state. For example, charging is performed according to the current value D1 during time period 1, and charging is performed according to the current value D2 during charging time period 2, etc.

[0057] It should be noted that D1 and D2 here are merely exemplary examples and are not fixed current values. The specific current values ​​can be determined based on the actual situation, and the embodiments of the present invention do not impose specific limitations on them.

[0058] If the command is related to charging information query, the query command is transmitted to the data acquisition and processing unit 222, which calculates the current voltage, current, power and other real-time quantities, as well as the operating status quantities, based on the query content.

[0059] The AC sampling execution module 23 is used to perform real-time digital sampling of the charging voltage and current of the charging device using a current transformer (CT) and a voltage transformer (PT).

[0060] For details, see Figure 6 As shown, Figure 6 This is a schematic diagram of the AC sampling execution module in an embodiment of the present invention. The AC sampling execution module 23 uses a current transformer (CT) and a current transformer (PT) to scale the charging voltage and charging current of the AC charging device according to a certain transformation ratio, converting them into small signals that can be processed by the processor. During this process, the AC sampling execution module 23 can sample the charging voltage and current in real time, ensuring the timeliness and accuracy of the data. The sampled small signals are sent to the processor for digital signal processing. This process includes steps such as filtering, amplification, and A / D conversion, converting the analog signal into a digital signal to achieve real-time digital sampling of the charging voltage and current, facilitating subsequent data analysis and processing.

[0061] The charging execution module 24 is used to adjust the charging power of the electric vehicle by using the duty cycle of the PWM square wave according to the charging curve, so as to achieve dynamic and flexible adjustment.

[0062] Specifically, during charging control, the charging execution module 24 receives a charging curve from the charging control unit 223. This curve details the changes in parameters such as power and current over time during charging. Based on this curve information, the charging execution module 24 can precisely control the charging process of the electric vehicle, ensuring that the charging process remains consistent with the preset charging curve. To achieve dynamic and flexible adjustment of charging power, the charging execution module 24 employs PWM technology. By adjusting the duty cycle of the PWM square wave—the ratio of high to low levels—the module can precisely control the charging current, thereby adjusting the charging power. This technology not only improves the controllability of the charging process but also reduces energy consumption and heat generation, extending the lifespan of the charging equipment and the electric vehicle. Simultaneously, the charging execution module 24 exhibits excellent dynamic response capabilities. It can detect changes in parameters during the charging process in real time, such as charging voltage and current, and quickly adjust the PWM duty cycle accordingly, ensuring that the charging process remains in optimal condition. This helps avoid safety issues such as overcharging and over-discharging, improving charging efficiency and safety.

[0063] In this embodiment of the invention, a communication module comprising a wireless communication unit, an HPLC carrier communication unit, and an RS485 communication unit is configured to solve the problem that existing AC charging piles cannot directly communicate with the smart integrated terminal of the distribution area. A communication protocol processing unit is configured, incorporating various mainstream communication protocols of the power industry, to solve the problem that the power communication protocols of existing AC charging piles are incompatible with the smart integrated terminal of the distribution area. An AC sampling execution module monitors the power consumption of the charging pile in real time, and uses the communication module and communication protocol processing unit to feed the power consumption data back to the smart integrated terminal of the distribution area in real time, solving the problem that existing AC charging piles cannot effectively monitor and statistically analyze charging data. An information security module is designed to perform identity security authentication on all interactive data, especially control commands, ensuring communication reliability and solving the problem of existing AC charging piles lacking information security protection. Furthermore, the charging execution module controls the charging power of the AC charging device, effectively solving the problem that AC charging piles cannot dynamically adjust the charging power during the charging process.

[0064] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0065] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A low-voltage area AC charging device with flexible control function, characterized in that, The application relates to a low-voltage power supply area intelligent fusion terminal charging device. The device comprises a communication module, a charging management module, an alternating current sampling and executing module and a charging executing module. The device is a portable mobile alternating current charging pile or a household alternating current charging pile which cannot directly communicate with the intelligent fusion terminal in a low-voltage power supply area. The communication module is provided with a wireless communication unit, an HPLC carrier communication unit and an RS485 communication unit, and is used for realizing communication with the low-voltage power supply area intelligent fusion terminal. The charging management module comprises a communication protocol processing unit, an alternating current sampling data processing unit and a charging control unit. The communication protocol processing unit is used for analyzing the communication message carrying the regulation and control instruction or the query instruction sent by the low-voltage power supply area intelligent fusion terminal, and transmitting the analysis result to the alternating current sampling data processing unit or the charging control unit; the communication protocol processing unit supports multiple power communication protocols and can adaptively match different power communication protocols; the alternating current sampling data processing unit is used for calculating the power consumption of the charging device according to the charging voltage and current data of the charging device when the query instruction is received; and the charging control unit is used for formulating the charging curve of the charging device according to the regulation and control instruction and the power consumption of the charging device when the regulation and control instruction is received. The alternating current sampling and executing module is used for realizing real-time digital sampling of the charging voltage and current of the charging device by using a current transformer and a voltage transformer. The charging executing module is used for accurately controlling the size of the charging current by using a PWM square wave duty cycle according to the charging curve, adjusting the charging power of the electric vehicle and realizing dynamic flexible adjustment; wherein the charging executing module can detect the changes of the charging voltage and current in the charging process in real time, and quickly adjusts the PWM duty cycle according to the changes, so that the charging process can always be kept in the best state.

2. The charging device of claim 1, wherein, The wireless communication unit and the HPLC carrier communication unit are detachable; the wireless communication unit realizes wireless networking function by using Bluetooth, star flash or LoRa wireless communication medium, and provides supplement when the HPLC carrier communication unit communication is not smooth.

3. The charging device of claim 2, wherein, The wireless communication unit can realize remote operation and maintenance operation of the device through a wireless channel.

4. The charging device of claim 3, wherein, The charging management module further comprises an information security unit which is used for performing information security inspection on the communication message received by the communication module by using a preset encryption algorithm.

5. The charging device of claim 4, wherein, The charging management module further comprises a device self-management unit which is used for realizing the firmware upgrade, operation self-check and fault alarm functions of the charging device itself.

6. The charging device of claim 5, wherein, The communication protocol processing unit is provided with multiple communication protocol libraries, and can automatically identify and match the mainstream power communication protocol in the market.

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