Charging metering device of alternating current charging pile

Abstract

The utility model relates to a charging metering device of an alternating current charging pile, which is characterized in that a voltage acquisition pin of an electric energy metering module is connected with a power supply of the alternating current charging pile for acquiring the power supply voltage of the alternating current charging pile, and a current acquisition pin is connected with a current transformer; the current transformer is used for being connected with a charging gun of the alternating current charging pile to measure charging current of the charging gun, and then electric energy data are obtained through internal calculation of the metering chip. Since the current acquisition pin acquires the charging current of the charging gun instead of the total current of the alternating current charging pile, the electric energy data of the charging gun, namely the electric energy consumed by automobile charging, are obtained, and the electric energy data do not include the electric energy consumed by the alternating current charging pile. According to the utility model, each module is designed based on low power consumption and low economical efficiency, so that the waste of electric energy is reduced, the electric energy consumed by the charging of the electric automobile using the alternating current charging pile can be independently measured, the accuracy of the consumed electric energy during the charging of a user is ensured, and the consumer rights and interests of the user are guaranteed.

Description

Technical Field

[0001] This application relates to the field of charging pile metering, and in particular to a charging metering device for an AC charging pile. Background Technology

[0002] Currently, as electric vehicles become increasingly popular in people's lives, the general public is gradually learning about and mastering the use of related supporting facilities. In particular, they not only want to know about various information related to their own economic interests in real time, but also hope that the accuracy and impartiality of such information can be reliably guaranteed, so that the charging consumption in daily use is accurate and reliable, and the charging payment is safe and secure.

[0003] Currently, high-power DC charging stations, due to their fast charging capabilities and high price, are primarily used in paid charging services. Low-power AC charging stations, which come with vehicles, are typically installed next to users' parking spaces due to their smaller size and power consumption, mainly for slow charging during users' downtime. The power company provides an AC meter for daily electricity billing during installation. Users calculate their electricity consumption monthly, just like with household electricity. However, AC charging stations are inexpensive due to their low single-phase power draw, making them readily available. Users can use the charging stations that come with their vehicles or purchase them online. This low price and diverse availability make it difficult to guarantee the quality of AC charging stations. Especially considering the long charging time of AC charging, any additional losses during the charging process accumulate over time and become significant. This cumulative loss not only results in financial losses for users but also wastes national energy resources. Because the charging data recorded by the existing AC charging pile meters mixes the energy consumption of the charging pile itself with the energy consumption of the actual electric vehicle charging, it is impossible to provide a data comparison. Therefore, it is necessary to develop a device suitable for AC charging pile metering. However, the current technology lacks a metering device that can independently measure the charging energy consumed by the AC charging pile during the charging process of the vehicle. Summary of the Invention

[0004] To address the technical problem of the lack of a device in the existing technology that can independently measure the amount of electricity consumed during the charging process of a car, this utility model provides a charging metering device for an AC charging pile.

[0005] Firstly, this utility model provides a charging metering device for an AC charging pile, the charging metering device comprising:

[0006] A current transformer is used to connect to the charging gun of an AC charging station to measure the charging current of the charging gun.

[0007] The MCU module has a data input pin, a first data read / write pin, and a first data communication pin;

[0008] The power metering module includes a single-phase metering chip RN8209D. The RN8209D has a voltage acquisition pin for acquiring voltage, a current acquisition pin for acquiring current, and a data output pin for outputting power data. The power data is the time integral of the product of voltage and current. The voltage acquisition pin is connected to the power supply of the AC charging pile to acquire the supply voltage of the AC charging pile. The current acquisition pin is connected to the current transformer to acquire the charging current of the charging gun. The data output pin and the data input pin are connected to send the power data to the MCU module.

[0009] A communication module has a second data communication pin, which is connected to the first data communication pin to receive the power data. The communication module is used to send the power data to a host computer.

[0010] A storage module has a second data read / write pin, which is connected to the first data read / write pin to receive the power data. The storage module is used to store the power data.

[0011] A power supply module that supplies power to the MCU module, the power metering module, the communication module, and the storage module.

[0012] In some of these embodiments, the MCU module includes a 32-bit microcontroller STM32F103VET6.

[0013] In some embodiments, both the data output pin and the data input pin are SPI interface pins.

[0014] In some embodiments, the power module includes an LS05-13B05R3 module and an 1117 module, wherein the LS05-13B05R3 module is used to convert 220V AC power into 5V DC power, and the 1117 module is used to convert 5V DC power into 3.3V DC power.

[0015] In some embodiments, the charging metering device further includes an interface module electrically connected to the MCU module for configuring parameters.

[0016] In some embodiments, the interface module includes a MAX3485 485 interface chip, the receive port 485RX1 and the transmit port 485TX1 of the interface module are both connected to the UART port of the MCU module, and the direction control port 485EN1 of the interface module is connected to the general-purpose I / O pin of the MCU.

[0017] In some embodiments, the communication module is an NBIoT module.

[0018] In some embodiments, the NBIoT module is a Quectel BC260Y module, which is configured to implement narrowband IoT communication in response to AT commands from the MCU module.

[0019] In some embodiments, the BC260Y module is provided with a SIM card slot.

[0020] In some embodiments, the storage module includes an E2ROM chip AT24C32, which is connected to the port of the MCU module via an I2C interface.

[0021] Compared with related technologies, the present invention has the following beneficial effects:

[0022] 1. The voltage acquisition pin of the energy metering module is connected to the power supply of the AC charging pile to acquire the supply voltage of the AC charging pile. The current acquisition pin is connected to a current transformer, which is used to connect to the charging gun of the AC charging pile to measure the charging current of the charging gun. Then, the energy data is obtained through internal calculation by the metering chip. Since the current acquisition pin acquires the charging current of the charging gun, not the total current of the AC charging pile, the calculated data is the energy data of the charging gun, that is, the energy consumed by the car charging, which does not include the energy consumed by the AC charging pile itself. Therefore, this utility model provides a charging metering device that can independently measure the charging energy consumed during the car charging process, thereby solving the technical problem of the lack of a metering device in the prior art that can independently measure the charging energy consumed by the AC charging pile during the car charging process.

[0023] 2. It adopts a domestically produced mainstream general-purpose single-channel metering chip, which can effectively verify various AC charging piles on the market. Moreover, its measurement accuracy is higher than that of the charging pile meter. The device compares the energy consumption during charging with the data measured by the charging pile meter. If the error is within the allowable range, the AC charging pile is considered to meet regulatory requirements; otherwise, it is unqualified. This ensures the accuracy of the energy consumption during charging and protects the consumer rights of users.

[0024] 3. Based on the economic considerations of the practical application of single-phase AC charging piles, all aspects of the device design are based on low power consumption and low cost. Data transmission is achieved based on the current low power consumption and low cost Narrowband Internet of Things (NBIoT) technology, which makes the long-term data transmission during device operation reliable and economical.

[0025] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0026] Figure 1 This is a structural diagram of the AC charging pile charging metering device in some embodiments;

[0027] Figure 2 These are circuit diagrams of the power metering module in some embodiments;

[0028] Figure 3 These are circuit diagrams of the communication module in some embodiments;

[0029] Figure 4 These are circuit diagrams of the storage module in some embodiments;

[0030] Figure 5 These are circuit diagrams of the power module in some embodiments;

[0031] Figure 6 These are circuit diagrams of the interface modules in some embodiments. Detailed Implementation

[0032] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0033] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these” used in this application do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include steps or modules (units) not listed, or may include other steps or modules (units) inherent to these processes, methods, products, or devices. Words such as “connected,” “linked,” and “coupled” used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. Normally, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific order of objects.

[0034] Figure 1 These are structural diagrams of the charging metering device for AC charging piles in some embodiments. (Refer to...) Figure 1 As shown, a charging metering device for an AC charging pile includes: a current transformer, an MCU module, an energy metering module, a communication module, a power supply module, and a storage module. The MCU module acts as the main controller, connecting to the other modules. The energy metering module collects data on the energy consumed by the charging pile. The storage module stores the energy data and other data that needs to be stored even when the power is off. The communication module transmits the energy data to a host computer. The power supply module provides power to the other modules.

[0035] In the charging metering device, the MCU module has data input pins, a first data read / write pin, and a first data communication pin. The MCU module connects to other modules via different pins. Various MCU module models are available, and the specific model can be selected based on usage requirements and compatibility with other modules.

[0036] In some of these embodiments, the MCU module includes a 32-bit microcontroller STM32F103VET6.

[0037] In the above embodiments, the MCU module is implemented based on the currently mainstream low-cost general-purpose 32-bit microcontroller STM32F103VET6. It integrates an ARM Cortex-M3 core and can provide support for consumer electronics, industrial control, medical, and security fields. It features high performance, low power consumption, reliability, and scalability, meeting the needs of various application scenarios. The MCU has a maximum frequency of 72MHz, 128KB of Flash memory, 20KB of SRAM memory, and supports multiple peripherals, meeting the design requirements of corresponding functional modules in the device.

[0038] In charging metering devices, current transformers are used to connect to the charging gun of an AC charging station to measure the charging current of the charging gun. A current transformer is a special type of transformer, connected in series with the charging gun of the vehicle. Based on the principle of electromagnetic induction, the current transformer can measure the magnitude of the charging current of the charging gun.

[0039] In the charging metering device, the energy metering module includes a single-phase metering chip RN8209D, which has a voltage acquisition pin for acquiring voltage, a current acquisition pin for acquiring current, and a data output pin for outputting energy data. The energy data is the time integral of the product of voltage and current. The voltage acquisition pin is connected to the power supply of the AC charging pile to acquire the power supply voltage of the AC charging pile, the current acquisition pin is connected to the current transformer to acquire the charging current of the charging gun, and the data output pin and data input pin are connected to send the energy data to the MCU module.

[0040] For the aforementioned single-phase metering chip RN8209D, since the current acquisition pin acquires the charging current of the charging gun, not the total current of the AC charging pile, the calculated data is the electrical energy data of the charging gun, that is, the electrical energy consumed by the car charging, which does not include the electrical energy consumed by the AC charging pile itself.

[0041] It should be noted that since the charging gun cannot be connected in an intrusive manner, this application uses a current transformer to measure the charging current of the charging gun, and the two are connected in a non-intrusive manner.

[0042] Figure 2 These are circuit diagrams of the energy metering module in some embodiments. (Refer to...) Figure 2 As shown, when the MCU module is a 32-bit microcontroller STM32F103VET6, the single-phase metering chip RN8209D and the 32-bit microcontroller STM32F103VET6 can be connected via an SPI interface. Furthermore, in some embodiments, both the data output pin and the data input pin are SPI interface pins.

[0043] In the above embodiment, the single-phase metering chip RN8209D collects the charging voltage of the AC charging pile and the charging current of the charging gun. The chip internally calculates the charging power and charging energy. The MCU module can read the energy data of the charging process through the SPI interface, thereby knowing the charging amount of each charge, which is the energy consumption of the electric vehicle.

[0044] In the above embodiments, the RN8209D can measure active power, reactive power, effective values ​​(RMS) of voltage and current, and voltage line frequency, and can provide active energy metering and reactive energy metering. It supports two independent outputs of active power, reactive power and current effective values.

[0045] In the charging metering device, the communication module has a second data communication pin, which is connected to the first data communication pin to receive power data. The communication module is used to send the power data to the host computer.

[0046] Figure 3 These are circuit diagrams of the communication module in some embodiments. (Refer to...) Figure 3 As shown, in some embodiments, the communication module is an NBIoT module. Further, the NBIoT module is a Quectel BC260Y module, which is configured to implement narrowband IoT communication in response to AT commands from the MCU module. The BC260Y module is equipped with a SIM card slot.

[0047] In the above embodiment, the NBIoT module is implemented using Quectel's BC260Y module. Data communication with the MCU is achieved via a serial port; specifically, the second data communication pin and the first data communication pin are serial port pins. The MCU controls the BC260Y module for narrowband IoT communication via AT commands. The BC260Y module provides a SIM card slot for operator SIM card installation, offering user authentication and data security protection.

[0048] In the charging metering device, the storage module has a second data read / write pin, which is connected to the first data read / write pin to receive electrical energy data. The storage module is used to store electrical energy data.

[0049] Figure 4 These are circuit diagrams of the storage module in some embodiments. (Refer to...) Figure 4 As shown, in some embodiments, the storage module includes an E2ROM chip AT24C32, which is connected to the port of the MCU module via an I2C interface.

[0050] In the above embodiment, the storage module is implemented using the conventional E2ROM chip AT24C32. The AT24C32 is suitable for embedded applications that require data retention after system power failure, such as storing system configuration, user data, calibration parameters, etc. It connects to the MCU port via an I2C interface; that is, the second data read / write pin and the first data read / write pin are I2C interface pins. The device stores the metered power data and other critical data that needs to be preserved after power failure into the storage module, achieving secure storage of critical data.

[0051] In the charging metering device, the power supply module supplies power to the MCU module, the energy metering module, the communication module, and the storage module.

[0052] Figure 5 These are circuit diagrams of the power module in some embodiments. (Refer to...) Figure 5 As shown, in some embodiments, the power supply module includes an LS05-13B05R3 module and an 1117 module. The LS05-13B05R3 module is used to convert 220V AC power to 5V DC power, and the 1117 module is used to convert 5V DC power to 3.3V DC power.

[0053] In the above embodiment, the power module is based on the single-phase 220AC power supply design of the AC charging pile. It is converted into DC 5V through the LS05-13B05R3 module. The 5V power supply is then converted into 3.3V through the 1117 module. The two DC power supplies can meet the power needs of different modules in the charging metering device.

[0054] Figure 6 These are circuit diagrams of the interface modules in some embodiments. (Refer to...) Figure 6 As shown, in some embodiments, the device further includes an interface module electrically connected to the MCU module for configuring parameters. Further, the interface module includes a MAX3485 485 interface chip. The interface module's receive port 485RX1 and transmit port 485TX1 are both connected to the UART port of the MCU module, and its direction control port 485EN1 is connected to a general-purpose I / O pin of the MCU, for implementing 485-level and 232-level conversion and transmit / receive control.

[0055] In the above embodiment, the 485 interface chip is implemented using MAX3485. Its transmit and receive ports 485RX1 and 485TX1 are connected to the UART port of the MCU module, and the direction control port 485EN1 is connected to the general-purpose IO pin of the MCU to realize the conversion between 485 level and 232 level and transmit and receive control. The other end provides an external interface through a terminal to realize the specific application parameter configuration of the device.

[0056] This invention uses an MCU module as the main controller to connect to other modules. A power supply module supplies power to these modules, and an energy metering module collects the charging energy consumed by the charging gun. A metering chip collects the voltage of the charging pile and the current of the charging gun. The chip internally calculates the charging energy consumed by the charging gun as energy data. Since the current acquisition pin collects the charging current of the charging gun, not the total current of the AC charging pile, the calculated data represents the energy consumed by the charging gun, i.e., the energy consumed by the car charging. This does not include the energy consumed by the AC charging pile itself. The MCU module can then read this energy data through the SPI interface. A storage module stores the metered energy data, and finally, a communication module sends the energy data to a host computer to display to the user. This energy data represents the energy consumed by the car charging process alone, thus providing a charging metering device for AC charging piles. This solves the technical problem of existing AC charging piles lacking a metering device capable of independently measuring the charging energy consumed by the AC charging pile during car charging. It ensures the accuracy of energy consumption during charging and protects the user's consumer rights.

[0057] Because the electricity consumption data recorded by the electricity meter of an AC charging pile generally includes both its own consumption and the consumption of the vehicle charging, the electricity consumption of the device when providing charging is compared with the data measured by the electricity meter of the charging pile. If the error is within the allowable range, the AC charging pile is considered to meet the regulatory requirements; otherwise, it is considered unqualified.

[0058] The following is a specific embodiment of a charging metering device for an AC charging pile.

[0059] This invention addresses the practical need for single-charge energy metering in current AC charging piles by proposing a device capable of collecting the energy generated during a single charge. The device's functionality and usage must consider cost-effectiveness. Its structural diagram is shown in the figure. The overall structure consists of an MCU module, a power supply module, a 485 interface module, an energy metering module, an NBIoT communication module, and a storage module. The power supply module provides power to all modules within the device; the serial port module configures various application parameters; the energy metering module measures the charging energy; the NBIoT communication module enables external data exchange; and the storage module stores critical energy and temperature data even after power loss.

[0060] The design principles of each part of the device are as follows:

[0061] 1) MCU module.

[0062] The MCU module is based on the mainstream low-cost general-purpose 32-bit microcontroller STM32F103VET6. It integrates an ARM Cortex-M3 core and provides support for consumer electronics, industrial control, medical, and security applications. It features high performance, low power consumption, reliability, and scalability to meet the needs of various application scenarios. The MCU can reach a maximum frequency of 72MHz, has 128KB of Flash memory and 20KB of SRAM memory, supports multiple peripherals, and meets the design requirements of corresponding functional modules in the device.

[0063] 2) Power module.

[0064] The power module is designed to draw power from a single-phase 220V AC charging pile. It converts the AC power to 5V DC via LS05-13B05R3, and then converts the 5V power to 3.3V via 1117 module. These two DC power supplies provide the power to all modules of the device.

[0065] 3) 485 interface module

[0066] The MAX3485 485 interface chip is used for implementation. Its transmit and receive ports 485RX1 and 485TX1 are connected to the UART port of the MCU module, and the direction control port 485EN1 is connected to the general-purpose I / O pin of the MCU to realize the conversion between 485 level and 232 level and transmit and receive control. The other end provides an external interface through a terminal block to realize the specific application parameter configuration of the device.

[0067] 4) Electricity metering module

[0068] The device's energy metering module uses a single-phase metering chip, RN8209D. The voltage is directly taken from the single-phase 220V power supply of the AC charging pile, and connected to the voltage acquisition pin of the metering chip via a sampling resistor. The current is taken from the output of an external current transformer, and similarly connected to the current acquisition pin of the metering chip via a sampling resistor. The metering chip communicates with the MCU via an SPI interface; that is, the MCU obtains the metered energy value collected by the metering chip through the SPI interface, thus obtaining the single-charge data information of the AC charging pile.

[0069] 5) NBIoT communication module

[0070] The NBIoT module is implemented using Quectel's BC260Y module. It communicates with the MCU via a serial port. The MCU controls the BC260Y module to perform narrowband IoT communication via AT commands. The BC260Y module provides SIM card installation for operators through the SIM1 card slot.

[0071] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0072] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

Claims

1. A charging metering device for an AC charging pile, characterized in that, The charging metering device includes: A current transformer is used to connect to the charging gun of an AC charging station to measure the charging current of the charging gun. The MCU module has a data input pin, a first data read / write pin, and a first data communication pin; The power metering module includes a single-phase metering chip RN8209D. The RN8209D has a voltage acquisition pin for acquiring voltage, a current acquisition pin for acquiring current, and a data output pin for outputting power data. The power data is the time integral of the product of voltage and current. The voltage acquisition pin is connected to the power supply of the AC charging pile to acquire the supply voltage of the AC charging pile. The current acquisition pin is connected to the current transformer to acquire the charging current of the charging gun. The data output pin and the data input pin are connected to send the power data to the MCU module. A communication module has a second data communication pin, which is connected to the first data communication pin to receive the power data. The communication module is used to send the power data to a host computer. A storage module has a second data read / write pin, which is connected to the first data read / write pin to receive the power data. The storage module is used to store the power data. A power supply module that supplies power to the MCU module, the power metering module, the communication module, and the storage module.

2. The charging metering device for an AC charging pile according to claim 1, characterized in that, The MCU module includes a 32-bit microcontroller STM32F103VET6.

3. The charging metering device for an AC charging pile according to claim 2, characterized in that, Both the data output pin and the data input pin are SPI interface pins.

4. The charging metering device for an AC charging pile according to claim 1, characterized in that, The power supply module includes an LS05-13B05R3 module and an 1117 module. The LS05-13B05R3 module is used to convert 220V AC power into 5V DC power, and the 1117 module is used to convert 5V DC power into 3.3V DC power.

5. The charging metering device for an AC charging pile according to claim 1, characterized in that, The charging metering device also includes an interface module, which is electrically connected to the MCU module and is used to configure parameters.

6. The charging metering device for an AC charging pile according to claim 5, characterized in that, The interface module includes a MAX3485 485 interface chip. The receive port 485RX1 and the transmit port 485TX1 of the interface module are both connected to the UART port of the MCU module. The direction control port 485EN1 of the interface module is connected to the general-purpose I / O pin of the MCU module.

7. The charging metering device for an AC charging pile according to claim 1, characterized in that, The communication module is an NBIoT module.

8. The charging metering device for an AC charging pile according to claim 7, characterized in that, The NBIoT module is a Quectel BC260Y module, which is configured to respond to AT commands from the MCU module to achieve narrowband IoT communication.

9. A charging metering device for an AC charging pile according to claim 8, characterized in that, The BC260Y module is equipped with a SIM card slot.

10. A charging metering device for an AC charging pile according to claim 1, characterized in that, The storage module includes an E2ROM chip AT24C32, which is connected to the port of the MCU module via an I2C interface.

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