Low-voltage transformer area alternating current charging device with flexible control function

Abstract

The invention discloses a low-voltage transformer area alternating current charging device with a flexible control function, and the device is provided with a communication module which comprises a wireless communication unit, an HPLC carrier communication unit and an RS485 communication unit, so that the problem that an existing alternating current charging pile cannot directly communicate with a transformer area intelligent fusion terminal is solved. The communication protocol processing unit is configured, and various mainstream communication protocols in the power industry are built in, so that the problem that a power communication protocol of an existing alternating current charging pile cannot be compatible with a transformer area intelligent fusion terminal is solved. The power utilization condition of the charging pile is monitored in real time through the alternating current sampling execution module, the power utilization data is fed back to the transformer area intelligent fusion terminal in real time through the communication module and the communication protocol processing unit, and the problem that the charging data cannot be effectively monitored and counted through an existing alternating current charging pile is solved. In addition, the charging power of the alternating current charging device is controlled through the charging execution module, and the problem that the charging power cannot be dynamically adjusted in the charging process of the alternating current charging pile is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of charging piles, and in particular to a low-voltage AC charging device with a flexible control function. Background Art

[0002] With the increasing global awareness of environmental protection and the rapid development of science and technology, the electric vehicle (EV) industry has experienced explosive growth. As a clean energy means of transportation, the popularization and application of electric vehicles are of great significance to 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 distribution networks.

[0003] When buying an electric car, the owner usually gets a convenient AC charging device or installs a home AC charging pile in a private parking space so that the electric car can be charged at any time. Due to the lack of effective external communication means, it is difficult for the substation fusion terminal on the low-voltage distribution network side to conduct real-time and effective regulation of the charging behavior of electric vehicles in the substation. The disordered charging behavior of users leads to greater randomness and volatility in the power load on the low-voltage distribution network side, which not only increases the risk of heavy overload and low voltage in the substation area of ​​the power grid, but also increases the difficulty of power grid dispatching and control, seriously affecting the safe and stable operation of the low-voltage distribution network.

[0004] In the prior art, a communication device is generally installed on the outside of the charging pile for communication transfer, so as to realize the control of the charging behavior of the charging pile by the station fusion terminal. This solution requires additional hardware equipment, which is not only inconvenient for on-site installation, but also because the communication protocols of the charging piles are not unified and the communication interface forms are inconsistent, resulting in complex functions of the installed communication equipment and the inability to achieve functional unification. In particular, for most private AC charging piles, there is no data communication interface for external communication. Even if external communication equipment is installed, effective communication with the charging pile cannot be achieved, and effective flexible control cannot be achieved. The purpose of regulation can only be achieved by installing an external circuit breaker for rigid control, but this solution has a poor user experience. Summary of the invention

[0005] The embodiment of the present application provides a low-voltage AC charging device with a 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 level of the low-voltage distribution network.

[0006] In order to achieve the above object, the technical solution of the embodiment of the present invention is:

[0007] In the first aspect, an embodiment of the present invention provides a low-voltage area AC charging device with a flexible control function, including: 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, which is used to realize communication with a low-voltage area intelligent fusion terminal; the charging management module includes a communication protocol processing unit, an exchange data processing unit and a charging control unit; wherein the communication protocol processing unit is used to parse the communication message carrying the control instruction or the query instruction sent by the low-voltage area intelligent fusion terminal, and transmit the parsing result to the exchange 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 acquisition data processing unit is used to calculate the power consumption of the charging device according to the charging voltage and current data of the charging device when receiving a query instruction. The charging control unit is used to formulate a charging curve of the charging device according to the control instruction and the power consumption of the charging device when receiving a control instruction. The AC sampling execution module is used to use a current transformer and a voltage transformer to perform real-time digital sampling of the charging voltage and current of the charging device. The charging execution module is used to adjust the charging power of the electric vehicle according to the charging curve and the PWM square wave duty cycle to achieve dynamic flexible adjustment.

[0008] In some possible implementations, the wireless communication unit and the HPLC carrier communication unit are detachable; the wireless communication unit implements wireless networking function through Bluetooth, StarFlash or LoRa wireless communication media, and is used to provide supplementary information when the HPLC carrier communication unit fails to communicate smoothly.

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

[0010] In some possible implementations, the charging management module further includes an information security unit for performing an information security check on the communication messages received by the communication module using a preset encryption algorithm.

[0011] In some possible implementations, the charging management module also includes a device self-management unit for implementing firmware upgrades, self-checks, and fault alarms for the charging device itself.

[0012] In some possible implementations, the communication protocol processing unit presets a plurality of communication protocol libraries, which can automatically identify and match the mainstream power communication protocols in the market.

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

[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 the embodiment of the present invention, by configuring a communication module including a wireless communication unit, an HPLC carrier communication unit and an RS485 communication unit, the problem that the existing AC charging pile cannot directly communicate with the intelligent fusion terminal of the substation is solved. By configuring a communication protocol processing unit and building in various mainstream communication protocols of the power industry, the problem that the power communication protocol of the existing AC charging pile is not compatible with the intelligent fusion terminal of the substation is solved. Through the AC sampling execution module, the power consumption of the charging pile is monitored in real time, and the communication module and the communication protocol processing unit are used to feed back the power consumption data to the intelligent fusion terminal of the substation in real time, thereby solving the problem that the existing AC charging pile cannot effectively monitor and count the charging data. In addition, the charging power of the AC charging device is controlled by the charging execution module, which effectively solves the problem that the AC charging pile cannot dynamically adjust the charging power during the charging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention, the accompanying drawings required for use in the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0017] Figure 1 This is a schematic diagram of the structure of the existing low-voltage charging pile;

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

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

[0020] Figure 4 It is another structural schematic diagram of a low-voltage AC charging device with a flexible control function in an embodiment of the invention;

[0021] Figure 5 is a working flow chart of the charging management module in an embodiment of the present invention;

[0022] Figure 6 It is a structural diagram of the AC sampling execution module in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0024] In the relevant description of this embodiment, the terms "including, containing, having" and the like are 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 "plurality" refers to two or more; the term "at least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items, for example, "at least one of a, b or c", or "at least one of a, b and c", can all represent: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, c can be single or multiple, respectively; the symbol "A / B" is used to describe the selection relationship of associated objects, generally indicating an "or" relationship before and after.

[0025] In the following description of the present embodiment, the terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0026] Those skilled in the art should understand that in the following description of the embodiments of the present application, the order of serial numbers does not mean the order of execution, some or all of the steps can be executed in parallel or sequentially, and 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 the present application.

[0027] Those skilled in the art will appreciate that the numerical ranges in the embodiments of the present application are to be construed as also specifically disclosing each intermediate value between the upper and lower limits of the scope. Each smaller range between the intermediate value in any stated value or stated range and any other stated value or intermediate value in the range is also included in the present invention. The upper and lower limits of these smaller ranges may be independently included or excluded in the scope.

[0028] Unless otherwise specified, the technical / scientific terms used herein have the same meanings as those generally understood by those skilled in the art to which this application belongs. Although this application only describes preferred methods and materials, any methods and materials similar or equivalent to these may also be used in the implementation or testing of this application. All documents mentioned in this specification are incorporated by reference to disclose and describe methods and / or materials related to the documents. In the event of a conflict with any incorporated document, the content of this specification shall prevail.

[0029] In order to illustrate the technical solution of the present invention, specific embodiments are provided below for illustration.

[0030] With the increasing global awareness of environmental protection and the rapid development of science and technology, the electric vehicle (EV) industry has experienced explosive growth. As a clean energy means of transportation, the popularization and application of electric vehicles are of great significance to 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 distribution networks.

[0031] When buying an electric car, the owner usually gets a convenient AC charging device or installs a home AC charging pile in a private parking space so that the electric car can be charged at any time. Figure 1 As shown, Figure 1 This is a schematic diagram of the structure of the existing low-voltage charging pile, see Figure 1 As shown in the figure, this type of AC charging pile generally consists of three parts: power supply control device, AC charging system and local maintenance communication interface. However, not all AC charging piles are equipped with a local maintenance communication interface. Even if they are equipped, their function is limited to the maintenance of the charging pile itself. In addition, the local maintenance communication interface is usually provided to the manufacturer for maintenance. During maintenance, the panel needs to be disassembled, and the external communication function cannot be directly realized.

[0032] Due to the lack of effective external communication means, it is difficult for the substation fusion terminal on the low-voltage distribution network side to conduct real-time and effective regulation of the charging behavior of electric vehicles in the substation. The disordered charging behavior of users leads to greater randomness and volatility in the power load on the low-voltage distribution network side, which not only increases the risk of heavy overload and low voltage in the power grid substation, but also increases the difficulty of grid dispatching and control, seriously affecting the safe and stable operation of the low-voltage distribution network.

[0033] In the prior art, a communication device is generally installed on the outside of the charging pile for communication transfer, so as to realize the control of the charging behavior of the charging pile by the station fusion terminal. This solution requires additional hardware equipment, which is not only inconvenient for on-site installation, but also because the communication protocols of the charging piles are not unified and the communication interface forms are inconsistent, resulting in complex functions of the installed communication equipment and the inability to achieve functional unification. In particular, for most private AC charging piles, there is no data communication interface for external communication. Even if external communication equipment is installed, effective communication with the charging pile cannot be achieved, and effective flexible control cannot be achieved. The purpose of regulation can only be achieved by installing an external circuit breaker for rigid control, but this solution has a poor user experience.

[0034] Based on this, an embodiment of the present invention provides a low-voltage AC charging device with flexible control function, which can realize real-time and effective regulation of electric vehicle charging behavior, improve user experience and the safe and stable operation level of the low-voltage 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 intelligent fusion terminal in the station area.

[0036] Figure 2 A schematic diagram of a low-voltage AC charging device with flexible control function provided for the implementation of the present invention, see Figure 2 As shown, the 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] The communication module 21 is mainly responsible for external communication functions, such as Figure 3 FIG. 1 is a schematic diagram of the structure of the communication module in the embodiment of the present invention. Figure 3 As shown, the communication module 21 is configured with a wireless communication unit 211, an HPLC carrier communication unit 212 and an RS485 communication unit 213. The wireless communication unit 211, the HPLC carrier communication unit 212 and the RS485 communication unit 213 are physically connected and communicated with the processor through the serial port. Through the communication module 21, communication with the low-voltage area intelligent fusion terminal is realized;

[0038] Among them, the wireless communication unit 211 can flexibly adapt to various complex communication environments. It can support a variety of wireless communication media such as Bluetooth, Star Flash, LoRa, etc., and can be selected according to the on-site environment and needs, and realize wireless networking using wireless communication protocols such as WAPI and ZigBee. When the HPLC carrier communication unit 212 causes poor communication due to some reasons (such as power line failure, signal interference, etc.), the wireless communication unit 211 can quickly fill in the position to ensure the continuity and stability of data communication. This complementary mechanism greatly improves the reliability and fault tolerance of the entire communication system. The HPLC carrier communication unit 212, that is, the high-speed power carrier module, can realize data communication with the help of the power supply line of the low-voltage distribution network, without the need to arrange communication lines separately, thereby 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. Once a functional unit fails or needs to be upgraded, it can be removed with a simple operation and replaced with a new or upgraded functional unit. This design not only shortens maintenance time and reduces maintenance costs. The detachable design facilitates on-site communication module replacement, thereby improving the flexibility and maintainability of the system.

[0040] In some embodiments, the wireless communication unit 211 can not only provide communication guarantee and ensure communication efficiency when HPLC communication is blocked, but also realize remote operation and maintenance of the equipment through the wireless channel.

[0041] For example, with the help of operation and maintenance tools such as mobile APP and mini-programs, convenient operation and maintenance, testing and acceptance channels are provided. Specifically, on the mobile APP, a comprehensive service platform integrating operation and maintenance, testing and acceptance is provided for operation and maintenance personnel. Through the connection of the wireless communication unit 211, the operation and maintenance personnel can obtain the operating status, equipment parameters and alarm information of the charging station in real time. This not only makes the operation and maintenance work more intuitive and efficient, but also shortens the time to respond to and handle problems.

[0042] In some embodiments, the RS485 communication interface is used as a reserved communication interface and can be used as an extended application for subsequent devices. Through the RS485 interface, cascade communication between different AC charging devices can be realized, or the communication module 21 can be used to enable the AC charging pile to directly log in to the remote cloud platform, etc., further improving the scalability and application flexibility of the system.

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

[0044] The communication protocol processing unit 221 is used to parse the communication message carrying the control instruction or query instruction sent by the low-voltage area intelligent fusion terminal, and transmit the parsing result to the traffic 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 is capable of parsing the communication messages sent by the low-voltage area intelligent fusion terminal. These messages may contain complex control instructions, such as adjusting the charging power, setting the charging time, etc., and may also contain query requests for device status or charging parameters. Through precise parsing, the communication protocol processing unit 221 can extract key information from the message. After the parsing is completed, the communication protocol processing unit 221 will pass the parsing results to the corresponding processing unit according to the type and content of the instruction. For control instructions, they will be passed to the acquisition data processing unit 222 to adjust the charging parameters in real time; for query instructions, they will be passed to the charging control unit 223 to obtain the real-time status or charging parameters of the device.

[0046] The communication protocol processing unit 221 presets a variety of communication protocol libraries, which can automatically identify and match the mainstream power communication protocols in the market, including but not limited to DLT645, DLT698, DLMS and other domestic and international mainstream communication protocols. This wide range of protocol support capabilities enables the system to easily cope with various complex communication environments and requirements, improves the compatibility and flexibility of the system, and the unit can perform adaptive matching according to the characteristics of different power communication protocols. When a new communication message is received, the communication protocol processing unit 221 will automatically identify and apply the communication protocol that best suits the current message without manual intervention. This automatic adaptive matching capability not only simplifies the operating process, but also improves the processing efficiency and accuracy of the system.

[0047] The data processing unit 222 is used to calculate the power consumption of the charging device according to the charging voltage and current data of the charging device when receiving the query instruction;

[0048] The cross-collection data processing unit 222 can receive query instructions from the communication protocol processing unit 221 in real time. These instructions usually require obtaining real-time charging voltage and current data of the charging device. Once the instruction is received, the unit will immediately start the data processing process and obtain the corresponding voltage and current data from the AC sampling execution module 23. Based on the acquired charging voltage and current data, the cross-collection data processing unit 222 can use a preset algorithm or mathematical model to calculate the power consumption of the charging device, mainly including voltage, current, active power, reactive power, accumulated power and other information. 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, it is convenient for the intelligent terminal in the substation to monitor the charging status of each AC charging pile in real time, and according to the overall power consumption of the substation, it is finally possible to formulate personalized charging control strategies for each charging device.

[0049] The charging control unit 223 is used to formulate a charging curve for the charging device according to the control instruction and the power consumption of the charging device when receiving the control instruction;

[0050] Specifically, the charging control unit 223 can receive control instructions from the communication protocol processing unit 221 in real time. These instructions may include adjusting the charging power, setting the charging time, optimizing the charging strategy, etc. Once the instruction is received, the charging control unit 223 will immediately parse it and clarify the specific requirements of the control. Based on the control instructions and the real-time power consumption of the charging device (such as charging voltage, current, power, etc.), the charging control unit 223 formulates the current actual charging curve through 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, and provide accurate 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 instructions of the intelligent terminal in the substation area and the actual charging situation of the current charging pile, thereby realizing flexible control of the current charging process.

[0051] In some embodiments, see Figure 4 As shown, Figure 4 It is another structural schematic diagram of a low-voltage AC charging device with flexible control function in an embodiment of the invention; wherein the charging management module 22 also 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 check on the communication message received by the communication module 21 using a preset encryption algorithm.

[0053] The function of the information security unit 224 is to perform strict information security checks on all communication messages received by the communication module 21. The inspection process covers multiple dimensions such as data integrity, authenticity and confidentiality, ensuring that only verified and authorized data can enter the subsequent protocol processing flow. In order to cope with increasingly complex network security threats, the information security unit 224 can adopt encryption algorithms commonly used in this field such as public key cryptography algorithms (SM2), cryptographic hash algorithms (SM3) and block cipher algorithms (SM4). Communication message data that passes the security check will be transferred to the communication protocol processing unit 221 for further protocol analysis, otherwise, it will be directly discarded. The use of the information security unit 224 ensures the security of communication and avoids data intrusion by external illegal users, which may cause security risks.

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

[0055] The following is a specific example to illustrate the working process of the charging management module 22. Figure 5 FIG. 2 is a flowchart of the charging management module 22 in an embodiment of the present invention. Figure 5 As shown, after the communication module 21 receives the communication data frame, the information security unit 224 first performs trusted verification and message decryption on the security information of the communication message data frame according to the information security algorithm. The verification methods include but are not limited to plain text + mac, ciphertext, ciphertext + mac, etc. For communication messages that fail the verification, they are directly discarded, and those that pass the verification are considered to be trusted communications and are handed over to the communication protocol processing unit 221 for protocol screening. The communication protocol processing unit 221 checks the communication messages according to the characteristics of each protocol and identifies the current communication protocol type, such as DLT645, DLT698, DLMS or other mainstream communication protocols. According to the identification results, the corresponding communication protocol library is called to parse the current communication message to define the desired operation of the current communication, such as querying the current charging information or flexibly regulating the charging power.

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

[0057] It should be noted that D1 and D2 are merely illustrative examples and are not definite current values. The specific current values ​​may be determined based on actual conditions, and the embodiments of the present invention do not specifically limit this.

[0058] If it is a charging information query related instruction, the query instruction is passed to the acquisition data processing unit 222, and the current voltage, current, power and other real-time quantities, as well as the operating status quantity, etc. are calculated in real time according to 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 Schematic diagram of the structure of the AC sampling execution module in the embodiment of the present invention. The AC sampling execution module 23 uses CT and PT to scale the charging voltage and charging current of the AC charging device according to a certain transformation ratio and convert them into small signals that can be processed by the processor. In this process, the AC sampling execution module 23 can sample the charging voltage and current in real time to ensure the timeliness and accuracy of the data. The sampled small signal will be sent to the processor for digital signal processing. This process includes steps such as filtering, amplification, and A / D conversion to convert analog signals into digital signals, and realize real-time digital sampling of charging voltage and current to facilitate subsequent data analysis and processing.

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

[0062] Specifically, when performing charging control, the charging execution module 24 can receive the charging curve from the charging control unit 223, and the charging curve describes in detail the changes of parameters such as power and current over time during the charging process. The charging execution module 24 can accurately control the charging process of the electric vehicle according to the charging curve information to ensure that the charging process is consistent with the preset charging curve. In order to achieve dynamic and flexible adjustment of the charging power, the charging execution module 24 adopts PWM technology. By adjusting the duty cycle of the PWM square wave, that is, the ratio of the high level to the low level, the module can accurately control the size of the charging current, thereby achieving the adjustment of the charging power. This technology not only improves the controllability of the charging process, but also reduces energy consumption and heat generation, and prolongs the service life of the charging equipment and the electric vehicle. At the same time, the charging execution module 24 has excellent dynamic response capabilities. It can detect parameter changes in the charging process in real time, such as charging voltage, current, etc., and quickly adjust the PWM duty cycle according to these changes to ensure that the charging process is always in the best state. This helps to avoid safety problems such as overcharging and over-discharging, and improve charging efficiency and safety.

[0063] In the embodiment of the present invention, by configuring a communication module including a wireless communication unit, an HPLC carrier communication unit and an RS485 communication unit, the problem that the existing AC charging pile cannot directly communicate with the intelligent fusion terminal of the substation is solved. By configuring a communication protocol processing unit, various mainstream communication protocols of the power industry are built-in, and the problem that the power communication protocol of the existing AC charging pile is not compatible with the intelligent fusion terminal of the substation is solved. Through the 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 fusion terminal of the substation in real time by using the communication module and the communication protocol processing unit, so as to solve the problem that the existing AC charging pile cannot effectively monitor and count the charging data. By designing an information security module, identity security authentication is performed on all interactive data, especially the control instructions, to ensure the reliability of communication and solve the problem that the existing AC charging pile has no information security protection; in addition, the charging power of the AC charging device is controlled by the charging execution module, which effectively solves the problem that the AC charging pile cannot realize dynamic adjustment of the charging power during the charging process.

[0064] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0065] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some or all of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A low-voltage AC charging device with flexible control function, characterized in that: include: Communication module, charging management module, AC sampling execution module and charging execution module; The communication module is configured with a wireless communication unit, an HPLC carrier communication unit and an RS485 communication unit, and is used to realize communication with the low-voltage area intelligent fusion terminal; The charging management module includes a communication protocol processing unit, a traffic data processing unit and a charging control unit; Among them, the communication protocol processing unit is used to parse the communication message carrying the control instruction or query instruction sent by the low-voltage area intelligent fusion terminal, and transmit the analysis result to the traffic 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 traffic data processing unit is used to calculate the power consumption of the charging device according to the charging voltage and current data of the charging device when receiving the query instruction; the charging control unit is used to formulate the charging curve of the charging device according to the control instruction and the power consumption of the charging device when receiving the control instruction; The AC sampling execution module is used to perform real-time digital sampling of the charging voltage and current of the charging device using a current transformer and a voltage transformer; The charging execution module is used to adjust the charging power of the electric vehicle according to the charging curve using the PWM square wave duty cycle to achieve dynamic flexible regulation.

2. The charging device according to claim 1, characterized in that: The wireless communication unit and the HPLC carrier communication unit are detachable; the wireless communication unit realizes wireless networking function through Bluetooth, Star Flash or LoRa wireless communication medium, and is used to provide supplement when the HPLC carrier communication unit fails to communicate smoothly.

3. The charging device according to claim 2, characterized in that: The wireless communication unit can realize remote operation and maintenance of the equipment through a wireless channel.

4. The charging device according to claim 3, characterized in that: The charging management module also includes an information security unit, which is used to perform information security checks on the communication messages received by the communication module using a preset encryption algorithm.

5. The charging device according to claim 4, characterized in that: The charging management module also includes a device self-management unit, which is used to implement the firmware upgrade, operation self-check and fault alarm functions of the charging device itself.

6. The charging device according to claim 5, characterized in that: The communication protocol processing unit presets a variety of communication protocol libraries, which can automatically identify and match the mainstream power communication protocols in the market.

7. The charging device according to any one of claims 1 to 6, characterized in that: The charging device is a mobile AC charging pile or a household AC charging pile.

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