A portable detection device for charging piles

Abstract

The utility model discloses an embodiment relates to charging pile technical field, especially, relate to a portable detection device of charging pile, through integration first interface, second interface, main control module, electric energy metering module and message communication module in portable detection device, the component and module all adopt miniaturized component, make the simple structure of detection device, small and exquisite, convenient to carry and on -the -spot operation use, can be directly inserted between charging socket and charging gun head, effectively avoid the accidental damage to charging socket. And, through message communication module, first CAN interface and second CAN interface monitoring and control between electric automobile and charging pile communication message, realized the automatic control of charging pile start -stop, and utilize the short characteristic of communication message refresh time period, real -time monitoring charging pile's communication message, realizes the accurate control to charging process, effectively reduced charging electric energy metering error, improved the accuracy of charging pile calibration result.

Description

Technical Field

[0001] This utility model relates to the field of charging pile technology, and in particular to a portable testing device for charging piles. Background Technology

[0002] With the rapid development and popularization of the electric vehicle industry, charging piles, as an important part of the electric vehicle industry infrastructure, have become a key factor in promoting the transformation and upgrading of automobiles and contributing to green transportation.

[0003] Currently, the operation and maintenance inspection of charging piles faces numerous challenges. First, traditional charging pile testing methods are time-consuming, require numerous and complex pieces of equipment, and are bulky and difficult to carry and use on-site, severely impacting charging pile inspection and maintenance work and failing to meet on-site operation and maintenance needs. Second, due to the continuous updates to electric vehicle standards and charging pile verification procedures, compatibility and adaptation between different electric vehicle models and different charging piles often require time, making it difficult to accurately measure the charging energy metering error generated during charging pile start-up and shutdown, thus reducing the accuracy of charging pile verification. Utility Model Content

[0004] In view of this, one objective of this utility model is to provide a portable testing device for charging piles, so as to solve the technical problems of existing charging pile testing equipment being numerous, complex in structure, and large in size, making them difficult to carry and use on site.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solutions: In a first aspect, embodiments of the present invention provide a portable testing device for charging piles, comprising: A first interface is used to connect to an electric vehicle, and the first interface includes a first CAN interface; The second interface is used to connect to the charging pile to be inspected, and the second interface includes a second CAN interface; Main control module; The power metering module is electrically connected to the main control module, and is electrically connected to the electric vehicle through the first interface and to the charging pile under test through the second interface, for measuring power parameters; The message communication module is communicatively connected to the main control module, and communicates with the electric vehicle through the first CAN interface and with the charging pile under test through the second CAN interface. It is used to monitor and manage the communication messages between the electric vehicle and the charging pile under test in order to control the start and stop of the charging pile under test.

[0006] In some embodiments, the power metering module includes a voltage sampling circuit, a current sampling circuit, and an analog-to-digital converter. The voltage sampling circuit is electrically connected between the charging socket of the electric vehicle and the charging gun of the charging pile to be tested. The voltage sampling circuit is also electrically connected to the analog-to-digital converter. The current sampling circuit is electrically connected to the power supply bus of the detection device and the analog-to-digital converter. The analog-to-digital converter is also electrically connected to the main control module.

[0007] In some embodiments, the voltage sampling circuit includes a first voltage / voltage conversion unit and a second voltage / voltage conversion unit. The first voltage / voltage conversion unit is electrically connected to the charging socket and the positive and negative terminals of the charging gun head. The first voltage / voltage conversion unit is also electrically connected to the second voltage / voltage conversion unit, and the second voltage / voltage conversion unit is also electrically connected to the analog-to-digital converter.

[0008] In some embodiments, the current sampling circuit includes a current comparator, a current sampling resistor, and a third voltage / voltage conversion unit. The primary winding of the current comparator is directly coupled to the power supply bus of the detection device, and the secondary winding of the current comparator is electrically connected to the current sampling resistor. The third voltage / voltage conversion unit is connected in parallel across the current sampling resistor and is also electrically connected to the analog-to-digital converter.

[0009] In some embodiments, the detection device further includes a power supply module, which is electrically connected to the main control module, the power metering module and the message communication module, respectively, and is used to provide power to the main control module, the power metering module and the message communication module.

[0010] In some embodiments, the analog-to-digital converter includes a 24-bit dual-channel ADC.

[0011] In some embodiments, the sampling rate of the dual-channel ADC is up to 1 million times per second.

[0012] In some embodiments, the length, width and height of the detection device are 210mm*130mm*130mm.

[0013] In some embodiments, the detection device weighs 2 kg.

[0014] In some embodiments, the message refresh time period of the message communication module is less than 5ms.

[0015] The present invention has the following advantages: Unlike existing technologies, the portable charging pile testing device provided in this invention integrates a first interface, a second interface, a main control module, an energy metering module, and a message communication module into a single portable testing device. Each component and module uses high-precision, miniaturized parts, resulting in ideal overall size and weight control. The device has a simple structure, is compact, and is easy to carry and operate on-site. It can be directly plugged into the charging socket of the electric vehicle and the charging gun of the charging pile, effectively avoiding accidental damage to the charging socket. Furthermore, the message communication module, the first CAN interface, and the second CAN interface monitor and control the communication messages between the electric vehicle and the charging pile. This enables automatic control of the charging pile's start-up and shutdown. Utilizing the short refresh cycle of the communication messages, the device monitors the charging pile's communication messages in real time, achieving precise control of the charging process. This reduces the energy metering error caused by communication message transmission delays during charging pile start-up and shutdown, significantly improving the accuracy of the charging pile calibration results. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below only show some embodiments of this utility model and should not be considered as limiting the scope of protection. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1a This is a schematic diagram of the structure of a portable detection device for a charging pile in some embodiments of this utility model; Figure 1b This is a schematic diagram showing the connection between the portable testing device for charging piles and the electric vehicle and the charging pile to be tested in some embodiments of this utility model. Figure 1c This is a schematic diagram of an actual product of the portable testing device for charging piles provided in some embodiments of this utility model; Figure 1d This is a schematic diagram showing the connection between a portable testing device for a charging pile and an electric vehicle and the charging pile to be tested in some embodiments of this utility model. Figure 1e This is a schematic diagram showing the connection between a portable testing device for a charging pile and a mobile terminal, as provided in some embodiments of this utility model. Figure 2a This is a schematic diagram of the structure of the power metering module in some embodiments of this utility model; Figure 2bThis is a schematic diagram of the voltage sampling circuit and current sampling circuit in the power metering module provided in some embodiments of this utility model; Figure 2c This is a schematic diagram of the structure of the analog-to-digital converter in the power metering module provided in some embodiments of this utility model; Figure 3a This is a structural schematic diagram of a portable testing device for a charging pile provided in some other embodiments of this utility model; Figure 3b This is a schematic diagram of the structure of the wireless communication module in some embodiments of this utility model; Figure 3c This is a schematic diagram of a portable testing device for a charging pile provided in some embodiments of the present invention, which is connected to a mobile terminal via a communication base station; Figure 4 This is a schematic diagram of the structure of a portable testing device for a charging pile provided in some other embodiments of this utility model; Figure 5 This is a schematic diagram of the structure of a portable testing device for a charging pile provided in some other embodiments of this utility model; Figure 6a This is a structural schematic diagram of a portable testing device for a charging pile provided in some other embodiments of this utility model; Figure 6b This is a schematic diagram showing the connection between the portable testing device for the charging pile and the charging pile to be tested in some embodiments of this utility model.

[0018] Explanation of reference numerals in the attached figures: 100. Portable testing device for charging piles; 10. First interface; 11. First CAN interface; 20. Second interface; 21. Second CAN interface; 30. Main control module; 40. Electricity metering module; 41. Voltage sampling circuit; 41a. First voltage / voltage conversion unit; 41b. Second voltage / voltage conversion unit; 42. Current sampling circuit; 42a. Current comparator; 42b. Current sampling resistor; 42c. Third voltage / voltage conversion unit; 43. Analog-to-digital converter; 43a. 24-bit dual-channel analog-to-digital converter (24-bit dual-channel ADC); 50. Message communication module; 60. Wireless communication module; 61. Cellular mobile communication module; 62. Wi-Fi module; 63. Bluetooth module; 70. Time synchronization module; 80. Power supply module; 90. Charging interface; 200. Electric vehicles; 210. Charging sockets; 300. Charging station to be inspected; 310. Charging gun head; 320. Low-voltage power interface; 400. Mobile terminal; 410. Laptop computer; 420. Tablet computer; 430. Smartphone; 500. Communication base station. Detailed Implementation

[0019] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. The detailed description of the embodiments of this utility model in the accompanying drawings is not intended to limit the scope of protection claimed by this utility model, but only to represent selected embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] It should be noted that when an element is referred to as being "fixed to" another element, it means that it can be directly attached to the other element or that an intervening element may be present. When an element is considered to be "connected to" another element, it can be directly connected to the other element or that an intervening element may be present simultaneously. The terms "vertical," "horizontal," "left," "right," "up," and "down," etc., used in this specification indicate orientation or position based on the orientation or position shown in the accompanying drawings.

[0021] It should be noted that the terms "first," "second," and other similar expressions used in this specification are for illustrative purposes and to distinguish between identical or similar items with substantially the same function and effect, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. "A plurality of" means two or more items, unless otherwise explicitly defined. It is worth noting that although functional modules are divided in the device or structural diagram, in some cases, a different module division may be used than that shown in the device or structure.

[0022] Unless otherwise defined, the technical and scientific terms used in this specification have the same meanings as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items. It should be understood that the technical features involved in the various embodiments of the invention described below can be combined with each other, provided that no conflict is established.

[0023] Please see Figure 1a and Figure 1b , Figure 1a This invention provides a schematic diagram of the structure of a portable testing device for charging piles according to some embodiments of the present invention. Figure 1b The diagram shows the connection between a portable testing device for charging piles provided in some embodiments of the present invention and an electric vehicle and the charging pile to be tested.

[0024] For example, such as Figure 1a and Figure 1b As shown, the portable testing device 100 for the charging pile includes a first interface 10, a second interface 20, a main control module 30, an energy metering module 40, and a message communication module 50.

[0025] In this embodiment, the first interface 10 is used to connect to the electric vehicle 200. The first interface 10 includes a first CAN interface 11, meaning the portable testing device 100 of the charging pile connects to the electric vehicle 200 through the first interface 10. The second interface 20 is used to connect to the charging pile 300 to be tested. The second interface 20 includes a second CAN interface 21, meaning the portable testing device 100 connects to the charging pile 300 to be tested through the second interface 20. Clearly, after the portable testing device 100 connects to the electric vehicle 200 through the first interface 10 and to the charging pile 300 to be tested through the second interface 20, the first CAN interface 11 and the second CAN interface 21 establish a communication connection.

[0026] Please see Figure 1c and Figure 1d The main control module 30, the energy metering module 40, and the message communication module 50 are integrated within the housing of the portable testing device 100 for the charging pile. The first interface 10 and the second interface 20 are located on the housing. When the portable testing device 100 is used to test the charging pile 300 under test, the first interface 10 and the second interface 20 are exposed within the housing of the portable testing device 100. It can be understood that the main control module 30, as the control module of the portable testing device 100, is responsible for receiving and processing various instructions and data information, and issuing instructions to coordinate and control the operation of other modules of the portable testing device 100, so that the entire portable testing device 100 operates according to a predetermined program and rules, thereby testing the charging pile 300 under test. The main control module 30 can be any suitable type of device or component, such as an FPGA chip, microcontroller, or SOC chip; this embodiment of the invention does not impose any limitations on this.

[0027] Specifically, the energy metering module 40 is electrically connected to the main control module 30, and is electrically connected to the electric vehicle 200 through the first interface 10, and to the charging pile 300 under test through the second interface 20. The energy metering module 40 is used for energy parameter measurement. That is, when the portable testing device 100 of the charging pile is used to test the charging pile 300, the energy metering module 40 measures the actual charging energy parameters of the electric vehicle 200 and transmits them to the main control module 30. Then, the main control module 30 calculates the actual charging energy and reads the labeled charging energy of the charging pile 300 under test. Based on the actual charging energy and the labeled charging energy, the charging energy error is calculated, thereby realizing the testing of the charging pile 300 under test. Finally, the portable testing device 100 of the charging pile is calibrated based on the charging energy error, thereby realizing the testing and calibration of the charging pile 300 under test.

[0028] Understandably, during the process of connecting the portable testing device 100 of the charging pile between the electric vehicle 200 and the charging pile 300 to be tested for testing and calibration, the power metering module 40 samples and processes the voltage and current signals during the charging process. That is, the voltage / voltage conversion unit and the current / voltage conversion unit of the power metering module 40 sample and acquire the voltage and current signals respectively, and the analog voltage and current signals are converted into digital voltage and current signals by the analog-to-digital converter of the power metering module 40, and then transmitted to the main control module 30.

[0029] For example, the message communication module 50 is communicatively connected to the main control module 30, and also communicates with the electric vehicle 200 via the first CAN interface 11 and with the charging pile 300 under inspection via the second CAN interface 21. The message communication module 50 is used to monitor and manage the communication messages between the electric vehicle 200 and the charging pile 300 under inspection to control the start and stop of the charging pile 300. That is, the message communication module 50 monitors, manages, and controls the message communication process between the charging pile 300 and the electric vehicle 200, and monitors the transmission status of communication messages in real time at millisecond levels. Through real-time monitoring and analysis of the communication messages, it determines the current charging status of the charging pile 300 under inspection, and actively sends and manages communication messages according to the pre-set charging requirements or other instructions in the main control module 30, thereby controlling the entire charging process of the charging pile 300 under inspection. The message refresh time period of the message communication module 50 is less than 5ms, thus achieving real-time monitoring of the transmission status of communication messages at millisecond levels.

[0030] More specifically, in some embodiments, the charging pile 300 to be inspected includes a charging gun head 310, the electric vehicle 200 includes a charging socket 210, and the energy metering module 40 is electrically connected to the charging socket 210 through a first interface 10 to realize the energy metering module 40 is electrically connected to the electric vehicle 200, and is electrically connected to the charging gun head 310 through a second interface 20 to realize the energy metering module 40 is electrically connected to the charging pile 300 to be inspected.

[0031] More specifically, the message communication module 50 communicates with the charging socket 210 through the first CAN interface 11, thereby enabling the message communication module 50 to communicate with the electric vehicle 200. The message communication module 50 communicates with the charging gun head 310 through the second CAN interface 21, thereby enabling the message communication module 50 to communicate with the charging pile 300 under inspection.

[0032] The main control module 30 is configured to: receive and respond to a detection start command; generate and transmit a detection start signal to the energy metering module 40 and the message communication module 50; cause the energy metering module 40 to start energy parameter metering; and cause the message communication module 50 to generate and transmit a charging start message to the charging pile 300 under test. Upon receiving the charging start message, the charging pile 300 under test responds to the charging start message and initiates the charging process, thereby starting to charge the electric vehicle 200. Simultaneously, the energy metering module 40 begins measuring energy parameters and transmitting them to the main control module 30.

[0033] The main control module 30 is also configured to: receive and respond to a detection termination command, generate and transmit a detection end signal to the energy metering module 40 and the message communication module 50, so that the energy metering module 40 ends energy parameter metering and the message communication module 50 generates and transmits a charging end message to the charging pile 300 under test. After receiving the charging end message, the charging pile 300 under test responds to the charging end message, terminates the charging process, and thus ends the charging of the electric vehicle 200. At the same time, the energy metering module 40 stops energy parameter metering.

[0034] For example, the workflow for testing and calibrating the charging pile 300 using the portable testing device 100 for the charging pile is as follows: 1) Connect the first interface 10 of the portable testing device 100 of the charging pile to the charging socket 210 of the electric vehicle 200, and connect the charging gun head 310 of the charging pile 300 to be tested to the second interface 20 of the portable testing device 100 of the charging pile.

[0035] 2) The user turns on the detection switch of the portable detection device 100 of the charging station, and on an external mobile terminal (e.g.) Figure 1eThe mobile terminal 400 operates on an application installed on a laptop computer 410, tablet computer 420, or smartphone 430. With the help of the Wi-Fi and / or Bluetooth modules of the portable testing device 100 of the charging pile, the mobile terminal establishes a corresponding Wi-Fi network connection and / or Bluetooth network connection with the portable testing device 100 of the charging pile. Then, the corresponding detection or verification parameters are set in the application of the mobile terminal, and the charging pile 300 and the electric vehicle 200 are waited for handshake communication.

[0036] 3) After the charging pile 300 under test and the electric vehicle 200 successfully communicate, the message communication module 50 of the portable testing device 100 of the charging pile monitors and controls the communication messages between the charging pile 300 under test and the electric vehicle 200 in real time. The message communication module 50 determines the current charging status of the charging pile 300 under test by monitoring and analyzing the communication messages.

[0037] 4) Once it is confirmed that the charging pile 300 under test has started charging the electric vehicle 200, the main control module 30 of the portable detection device 100 of the charging pile calculates the cumulative energy value of the charging (i.e., the charging energy) based on the voltage and current data (i.e., voltage signal and current signal) collected by the energy metering module 40 and the charging time (i.e., the duration of the charging pile 300 under test charging the electric vehicle 200).

[0038] 5) When the accumulated charging energy (i.e., charging energy) or charging time reaches the user-set demand value or threshold value, the message communication module 50 actively sends a stop charging message to the charging pile 300 under test. The charging pile 300 under test responds to the stop charging message and ends the charging process for the electric vehicle 200. The main control module 30 analyzes and processes the messages transmitted by the message communication module 50 and extracts the charging data of the electric vehicle 200 (i.e., the indicated charging energy of the charging pile 300 under test).

[0039] 6) The main control module 30 of the portable testing device 100 for charging piles calculates the charging energy error of the charging pile 300 based on the calculated standard energy value / cumulative energy value (i.e., the actual charging energy of the electric vehicle 200) and the labeled charging energy of the charging pile 300 under test, which is input by the user in the mobile terminal or read directly from the charging pile 300 under test through image recognition or directly. This enables the testing of the charging pile 300 under test. Finally, the portable testing device 100 for charging piles is calibrated based on the charging energy error, thereby achieving the testing and calibration of the charging pile 300 under test.

[0040] In this embodiment of the utility model, the length, width, and height of the portable testing device 100 for the charging pile are approximately 210mm, 130mm, and 130mm, respectively. That is, the length, width, and height of the portable testing device 100 for the charging pile are approximately 210mm*130mm*130mm. Obviously, the length, width, and height of the portable testing device 100 for the charging pile can be exactly 210mm*130mm*130mm, or they can be dimensions with an error within a preset error range from 210mm, 130mm, and 130mm. For example, the length can be 215mm, the width can be 135mm, and the height can be 135mm.

[0041] In this embodiment of the utility model, the portable detection device 100 for the charging pile weighs approximately 2 kg. Similarly, the portable detection device 100 for the charging pile can weigh exactly 2 kg, or it can be a weight within a preset error range of 2 kg, such as 1.96 kg.

[0042] The portable charging pile testing device provided in this embodiment integrates a first interface, a second interface, a main control module, an energy metering module, and a message communication module into a single portable testing device. Each component and module utilizes high-precision, miniaturized parts, resulting in ideal overall size and weight control. Its simple structure and compact size facilitate portability and on-site operation. It can be directly plugged into the charging socket of an electric vehicle and the charging gun of the charging pile, effectively preventing accidental damage to the charging socket. Furthermore, by monitoring and controlling the communication messages between the electric vehicle and the charging pile through the message communication module, the first CAN interface, and the second CAN interface, automatic control of the charging pile's start-up and shutdown is achieved. Utilizing the short refresh cycle of the communication messages, real-time monitoring of the charging pile's communication messages enables precise control of the charging process, reducing energy metering errors caused by communication message transmission delays during charging pile start-up and shutdown, and significantly improving the accuracy of charging pile verification results.

[0043] Please see Figure 2a In some embodiments, the energy metering module 40 specifically includes a voltage sampling circuit 41, a current sampling circuit 42, and an analog-to-digital converter 43. The voltage sampling circuit 41 is electrically connected between the charging socket 210 of the electric vehicle 200 and the charging gun head 310 of the charging pile 300 under test, that is, the voltage sampling circuit 41 is electrically connected to the positive and negative terminals of the charging socket 210 and the charging gun head 310. The voltage sampling circuit 41 is also electrically connected to the analog-to-digital converter 43, and is used to sample the voltage signal during the charging process of the electric vehicle 200 and transmit the voltage signal to the analog-to-digital converter 43.

[0044] For example, the current sampling circuit 42 is electrically connected to the power supply bus 101 of the portable detection device 100 of the charging pile and the analog-to-digital converter 43, respectively. The current sampling circuit 42 is used to sample the current signal during the charging process of the electric vehicle 200 and transmit the voltage signal to the analog-to-digital converter 43. Understandably, the analog-to-digital converter 43 is a dual-channel analog-to-digital converter, and the analog-to-digital converter 43 is also electrically connected to the main control module 30. The analog-to-digital converter 43 is used to receive the voltage signal and current signal during the charging process, process the voltage signal and current signal into digital signal form, and transmit the digital signal form of the voltage signal and current signal to the main control module 30.

[0045] In this embodiment, the power metering module 40 uses high-precision, miniaturized components. The sampling rate of the voltage sampling circuit 41 and the current sampling circuit 42 reaches 1 MSPS (1 million times / second), which can ensure the accuracy and real-time performance of the measured voltage and current signals. This allows the portable detection device 100 of the charging pile to maintain high measurement accuracy and real-time performance while keeping the overall size and weight of the portable detection device 100 of the charging pile very small, thus achieving a simple structure and compact size design.

[0046] Please see Figure 2b In some embodiments, the voltage sampling circuit 41 includes a first voltage / voltage conversion unit 41a and a second voltage / voltage conversion unit 41b. The first voltage / voltage conversion unit 41a is electrically connected to the positive and negative terminals of the charging socket 210 and the charging gun head 310, that is, the first voltage / voltage conversion unit 41a is electrically connected between the charging socket 210 and the charging gun head 310. The first voltage / voltage conversion unit 41a is also electrically connected to the second voltage / voltage conversion unit 41b, and the second voltage / voltage conversion unit 41b is also electrically connected to the analog-to-digital converter 43.

[0047] Please continue reading. Figure 2b In some embodiments of this utility model, the current sampling circuit 42 includes a current comparator 42a, a current sampling resistor 42b, and a third voltage / voltage conversion unit 42c. The primary winding of the current comparator 42a is directly coupled to the power supply bus 101 of the portable detection device 100 of the charging pile, and the secondary winding of the current comparator 42a is electrically connected to the current sampling resistor 42b. The third voltage / voltage conversion unit 42c is connected in parallel across the current sampling resistor 42b and is also electrically connected to the analog-to-digital converter 43.

[0048] In this embodiment, the first voltage / voltage conversion unit 41a, the second voltage / voltage conversion unit 41b, and the third voltage / voltage conversion unit 42c all employ high-precision, miniaturized resistor dividers. These resistor dividers are very lightweight and compact, thus achieving a lightweight and simplified design for the voltage sampling circuit 41 and the current sampling circuit 42. Furthermore, the magnetic core of the current comparator 42a can be directly mounted on the copper pillar of the power supply bus 101 of the portable testing device 100 of the charging pile, thereby saving internal space in the portable testing device 100. This results in a simple and compact structure for the portable testing device 100, making it easy to carry and operate on-site.

[0049] Please see Figure 2c In some embodiments of this invention, the analog-to-digital converter 43 includes a 24-bit dual-channel analog-to-digital converter 43a (i.e., a 24-bit dual-channel ADC 43a). It can be understood that 24 bits refers to the resolution specification of the analog-to-digital converter, representing its ability to distinguish subtle changes in analog signals. Resolution is measured in "bits," and 24 bits means that the analog-to-digital converter can divide its measurable full-scale analog signal range into... The quantization interval consists of several equal small intervals. The higher the resolution (i.e., the more bits), the smaller the quantization interval. This makes the analog-to-digital converter more sensitive to subtle changes in the analog signal, resulting in a smaller error (quantization error) between the converted digital signal and the original analog signal, and thus higher accuracy.

[0050] In essence, "dual-channel" means that the analog-to-digital converter (ADC) has two independent (or partially shared) analog signal input channels, capable of simultaneously or alternately converting two different analog signals to digital signals. The two channels are connected to different analog signal sources (e.g., voltage signals from two sensors, or voltage and current signals from two sensors). Internally, the ADC processes the analog signals through switching circuits or a separate conversion core. In other words, a dual-channel ADC is an electronic device capable of simultaneously or alternately sampling, quantizing, and converting two different analog signals into digital signals, efficiently handling multiple analog signal inputs.

[0051] In this embodiment, the two channels of the 24-bit dual-channel analog-to-digital converter 43a are respectively connected to the voltage sampling circuit 41 and the current sampling circuit 42. The voltage analog signal and the current analog signal output by the voltage sampling circuit 41 and the current sampling circuit 42 are processed and converted by the conversion core or chip inside the 24-bit dual-channel analog-to-digital converter 43a to obtain the voltage digital signal and the current digital signal.

[0052] In this embodiment, the 24-bit dual-channel analog-to-digital converter 43a is implemented using high-precision, miniaturized components. The sampling rate of the 24-bit dual-channel analog-to-digital converter 43a reaches 1 MSPS (1 million times / second), which can ensure the accuracy and real-time performance of the measured voltage and current signals. As a result, the portable detection device 100 for charging piles can maintain high measurement accuracy and high real-time performance while keeping the overall size and weight of the portable detection device 100 for charging piles to a very small range, thus achieving a simple structure and compact size design.

[0053] Please see Figure 3a In some embodiments, the portable testing device 100 for the charging pile further includes a wireless communication module 60, which is communicatively connected to the main control module 30. The portable testing device 100 for the charging pile communicates with a mobile terminal via the wireless communication module 60; that is, the wireless communication module 60 enables wireless communication between the portable testing device 100 for the charging pile and the mobile terminal. For example, please refer to... Figure 1e The portable detection device 100 of the charging pile communicates wirelessly with the mobile terminal 400 (e.g., laptop 410, tablet 420 or smartphone 430) via the wireless communication module 60.

[0054] In this embodiment, a wireless communication module 60 is provided to enable wireless communication between the portable testing device 100 of the charging pile and the mobile terminal. This allows the user to transmit data and interact with the portable testing device 100 of the charging pile via the mobile terminal, so as to facilitate the testing and calibration of the charging pile 300 under test.

[0055] Please see Figure 3b and Figure 3c In some embodiments of this utility model, the wireless communication module 60 includes a cellular mobile communication module 61, which is communicatively connected to the main control module 30 and the communication base station 500. The portable testing device 100 of the charging pile is communicatively connected to the mobile terminal 400 through the cellular mobile communication module 61 and the communication base station 500. The cellular mobile communication module 61 is used to enable wireless communication between the portable testing device 100 of the charging pile and the mobile terminal 400.

[0056] It is understood that the cellular mobile communication module 61, based on communication standards such as 3G, 4G, or 5G, establishes a wireless communication connection with the communication base station 500 through its built-in radio frequency circuit and baseband chip. This allows the portable detection device 100 of the charging pile to interact with external devices (e.g., mobile terminal 400) or other devices via the cellular mobile communication network. The cellular mobile communication module 61 can be a 3G network module, a 4G network module, or a 5G network module, etc.

[0057] Please continue reading. Figure 3b In some embodiments of this utility model, the wireless communication module 60 further includes a Wi-Fi module 62, which is communicatively connected to the main control module 30. The portable detection device 100 of the charging pile is communicatively connected to the mobile terminal 400 through the Wi-Fi module 62, that is, the Wi-Fi module 62 is used to enable wireless communication between the portable detection device 100 of the charging pile and the mobile terminal 400.

[0058] Understandably, the Wi-Fi module 62 is a Wi-F communication network based on the IEEE 802.11 standard or any other suitable communication standard. It can realize data transmission and command interaction between devices and between devices and wireless networks. Obviously, the main function of the Wi-Fi module 62 is to enable wireless communication between the portable detection device 100 of the charging pile and the mobile terminal 400.

[0059] Please continue reading. Figure 3b In some embodiments of this utility model, the wireless communication module 60 further includes a Bluetooth module 63, which is communicatively connected to the main control module 30. The portable detection device 100 of the charging pile is communicatively connected to the mobile terminal 400 via the Bluetooth module 63; that is, the Bluetooth module 63 is used to enable wireless communication between the portable detection device 100 of the charging pile and the mobile terminal 400.

[0060] Understandably, the Bluetooth module 63 is based on Bluetooth 5.0, Bluetooth 6.0 or any other suitable technical standard and is used for short-range wireless communication. It can establish wireless communication connections between multiple devices, thereby realizing data exchange, command interaction, control, etc. of multiple devices. The main function of the Bluetooth module 63 is to enable wireless communication between the portable detection device 100 of the charging pile and the mobile terminal 400.

[0061] Please see Figure 4 In some embodiments, the portable detection device 100 of the charging pile further includes a time synchronization module 70, which is communicatively connected to the main control module 30. The time synchronization module 70 is configured to receive and acquire precise time based on time signals, providing a time reference for components, modules, or devices requiring precise time synchronization. Understandably, the time synchronization module 70 is an electronic component or device capable of providing precise time information. Its main function is to acquire precise time through specific technical means, output the precise time in a specific format, and provide a time reference for various electronic systems, equipment, devices, and components, ensuring time synchronization between different devices, devices, or systems.

[0062] It should be understood that the time synchronization module 70 may be a GPS time synchronization module, which receives time signals transmitted by Global Positioning System (GPS) satellites and obtains accurate time based on the time signals. GPS satellites are equipped with high-precision atomic clocks, whose time accuracy can reach the nanosecond level.

[0063] In some embodiments, the time synchronization module 70 may be a BeiDou time synchronization module. The BeiDou time synchronization module achieves time synchronization based on China's independently developed BeiDou satellite navigation system, that is, by receiving time signals transmitted by BeiDou satellites and obtaining precise time based on these signals. It is understood that the BeiDou satellite navigation system also uses high-precision atomic clocks, resulting in extremely high time accuracy.

[0064] In some embodiments, the time synchronization module 70 may be an NTP time synchronization module (network time synchronization). The NTP time synchronization module is connected to an NTP (Network Time Protocol) server through a communication network. The NTP server is synchronized with an atomic clock or other high-precision time source and transmits time information to the time synchronization module 70 through the communication network, so that the time synchronization module 70 obtains accurate time based on the time information.

[0065] In some embodiments, the time synchronization module 70 may be an IRIG-B code time synchronization module. IRIG-B code is a time coding standard widely used in the industrial field. The IRIG-B code time synchronization module receives IRIG-B code signals (such as AC signals, DC signals, or optical signals) and obtains accurate time based on the IRIG-B code signals.

[0066] In some embodiments, the timing module 70 includes a receiving unit (for receiving external time signals, such as satellite antennas, network interfaces, signal receivers, etc.), a processing unit (for decoding, verifying, and processing the received time signals, etc.), and an output unit (for outputting the processed time information in a specific format, such as RS232, RS485, TTL level, or pulse signal, for use by other devices, apparatuses, or components, etc.).

[0067] Please see Figure 5In some embodiments, the portable testing device 100 for the charging pile further includes a power module 80, which is electrically connected to the main control module 30, the energy metering module 40, and the message communication module 50. The power module 80 has a built-in energy storage unit, capable of stably outputting voltage and current to provide the main control module 30, the energy metering module 40, and the message communication module 50 with the necessary power for normal operation. In this embodiment, the energy storage unit of the power module 80 is a supercapacitor. Compared with conventional lithium battery power supply solutions, this ensures power supply stability while further saving internal space in the portable testing device 100, making the structure of the portable testing device 100 for the charging pile more compact.

[0068] In this embodiment, by setting the power module 80 to provide the electrical energy required for normal operation of each component or part of the portable testing device 100 of the charging pile, the portable testing device 100 of the charging pile can be used normally to achieve the testing and calibration of the charging pile 300 to be tested.

[0069] Please see Figure 6a and Figure 6b In some embodiments, the portable testing device 100 for the charging pile further includes a charging interface 90, and the charging pile 300 under test further includes a low-voltage power interface 320. The power module 80 is electrically connected to both the charging interface 90 and the low-voltage power interface 320. The power module 80 can be charged from an external power source via the charging interface 90, or it can be charged by connecting to the low-voltage power interface 320 of the charging pile 300 under test. The charging interface 90 can be any suitable type of interface, such as a Type-C interface or a USB interface; this embodiment of the invention does not impose any limitations on this.

[0070] For example, when the charging interface 90 is electrically connected to an external power source, the external power source charges the power module 80 through the charging interface 90. And / or, when the charging pile 300 under test starts the charging process to charge the electric vehicle 200, the charging pile 300 under test charges the power module 80 through the low-voltage power interface 320.

[0071] In this embodiment, by setting up a charging interface 90 and / or a low-voltage power interface 320 to charge the power module 80, it is ensured that the power module 80 can store enough electrical energy to provide the electrical energy required for normal operation of various components or parts of the portable testing device 100 of the charging pile.

[0072] Through the optimization of the structure and component selection described above, the overall size of the portable charging pile testing device 100 is controlled to be approximately 210mm*130mm*130mm (length*width*height), and the weight is approximately 2kg. Furthermore, the communication message refresh time cycle is controlled to be less than 5ms (as low as 2ms). Even for DC supercharging piles with a maximum charging power of 300kW, when using the portable charging pile testing device 100 provided by this utility model to test the charging pile, the charging energy measurement error caused by the communication message transmission delay during the start-up and shutdown of the charging pile will not exceed 0.05% of the minimum verification energy. Even for the highest-level charging piles currently on the market, an error of no more than 0.05% of the minimum verification energy is negligible, thus significantly improving the accuracy of the charging pile testing results.

[0073] In summary, the portable charging pile testing device provided by this utility model integrates a first interface, a second interface, a main control module, an energy metering module, and a message communication module into a single portable testing device. Each component and module utilizes high-precision, miniaturized parts, resulting in ideal overall size and weight control. The device has a simple structure, is compact, and is easy to carry and operate on-site. It can be directly plugged into the charging socket of the electric vehicle and the charging gun of the charging pile, effectively preventing accidental damage to the charging socket. Furthermore, by monitoring and controlling the communication messages between the electric vehicle and the charging pile through the message communication module, the first CAN interface, and the second CAN interface, automatic control of the charging pile's start-up and shutdown is achieved. Utilizing the short refresh cycle of the communication messages, real-time monitoring of the charging pile's communication messages enables precise control of the charging process, reducing energy metering errors caused by communication message transmission delays during charging pile start-up and shutdown, and significantly improving the accuracy of charging pile verification results.

[0074] Those skilled in the art will understand that the above-mentioned technical features can be used in any combination without limitation. The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to more clearly understand the technical features, purpose and effects of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, should also be included within the scope of protection of the claims of this utility model.

Claims

1. A portable testing device for charging piles, characterized in that, include: A first interface is used to connect to an electric vehicle, and the first interface includes a first CAN interface; The second interface is used to connect to the charging pile to be inspected, and the second interface includes a second CAN interface; Main control module; The power metering module is electrically connected to the main control module, and is electrically connected to the electric vehicle through the first interface and to the charging pile under test through the second interface, for measuring power parameters; The message communication module is communicatively connected to the main control module, and communicates with the electric vehicle through the first CAN interface and with the charging pile under test through the second CAN interface. It is used to monitor and manage the communication messages between the electric vehicle and the charging pile under test in order to control the start and stop of the charging pile under test.

2. The detection device according to claim 1, characterized in that, The power metering module includes a voltage sampling circuit, a current sampling circuit, and an analog-to-digital converter. The voltage sampling circuit is electrically connected between the charging socket of the electric vehicle and the charging gun of the charging pile under test. The voltage sampling circuit is also electrically connected to the analog-to-digital converter. The current sampling circuit is electrically connected to the power supply bus of the detection device and the analog-to-digital converter. The analog-to-digital converter is also electrically connected to the main control module.

3. The detection device according to claim 2, characterized in that, The voltage sampling circuit includes a first voltage / voltage conversion unit and a second voltage / voltage conversion unit. The first voltage / voltage conversion unit is electrically connected to the charging socket and the positive and negative terminals of the charging gun head. The first voltage / voltage conversion unit is also electrically connected to the second voltage / voltage conversion unit, and the second voltage / voltage conversion unit is also electrically connected to the analog-to-digital converter.

4. The detection device according to claim 2, characterized in that, The current sampling circuit includes a current comparator, a current sampling resistor, and a third voltage / voltage conversion unit. The primary winding of the current comparator is directly coupled to the power supply bus of the detection device, and the secondary winding of the current comparator is electrically connected to the current sampling resistor. The third voltage / voltage conversion unit is connected in parallel across the current sampling resistor and is also electrically connected to the analog-to-digital converter.

5. The detection device according to claim 1, characterized in that, It also includes a power supply module, which is electrically connected to the main control module, the power metering module and the message communication module, respectively, and is used to provide power to the main control module, the power metering module and the message communication module.

6. The detection device according to claim 2, characterized in that, The analog-to-digital converter includes a 24-bit dual-channel ADC.

7. The detection device according to claim 6, characterized in that, The dual-channel ADC has a sampling rate of up to 1 million times per second.

8. The detection device according to any one of claims 1-7, characterized in that, The length, width, and height of the detection device are 210mm*130mm*130mm.

9. The detection device according to any one of claims 1-7, characterized in that, The detection device weighs 2 kg.

10. The detection device according to any one of claims 1-7, characterized in that, The message refresh time period of the message communication module is less than 5ms.

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