Electric energy metering device and method for charging pile error self-checking

Abstract

The invention discloses an electric energy metering device and method for charging pile error self-checking. Wherein the electric energy metering device comprises a home terminal electric energy sensor and a public electric energy sensor; one side of the home terminal electric energy sensor is connected in series with one side of the public electric energy sensor; a first port arranged in parallel on the other side of the public electric energy sensor is connected in series with the AC-DC converter switch, and a second port is connected in series with the adjacent first electric energy metering device; a fourth port at the other side of the public electric energy sensor is connected in series with the adjacent second electric energy metering device; an electric energy metering device is arranged on each charging pile, so that a self-checking circuit of the electric energy metering device of each charging pile is formed. According to the invention, only one standard electric energy sensor needs to be arranged on the selected charging pile error self-checking line, error self-checking of each charging pile electric energy metering device is realized through reading of the standard electric energy sensor and the home terminal electric energy sensor of each charging pile connected in series, the charging pile error detection efficiency is improved, and the detection cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy error detection, and in particular to an electric energy metering device and method for self-detection of charging pile errors. Background Art

[0002] With the development of society, people pay more and more attention to environmental protection. Clean energy is becoming more and more popular in society. Electric vehicles are being manufactured and used all over the world. As time goes by, the world pays more attention to environmental protection. Electric energy as a clean energy will be more and more valued by people. Some experts believe that electric vehicles will gradually replace gas vehicles and become the new mainstream means of transportation.

[0003] Electric vehicle charging piles are measuring instruments for charging electricity trading. With the increase in electric vehicles, the error detection technology of electric vehicle charging piles is very important. The rapid development of electric vehicles has led to a sharp increase in the number of charging piles. However, existing electric vehicle charging piles mostly adopt a direct connection method, so that one error detection can only calibrate one charging pile. This method is not only time-consuming, but also unable to meet the market demand for rapid calibration of multiple connected charging piles. In addition, the error detection or calibration of each charging pile in the traditional detection process requires the addition of a standard electric energy meter or other metering components on the charging line of each charging pile. This method greatly increases the error detection cost of the charging pile and affects the reliability of the safe operation of the charging pile.

[0004] In view of this, overcoming the defects of the prior art is an urgent problem to be solved in this technical field. Summary of the invention

[0005] The technical problem to be solved by the present invention is that a solution is urgently needed to quickly detect or calibrate the errors of each charging pile in a charging pile cluster while saving costs as much as possible, so as to solve the problem of improving the efficiency of charging pile error detection and reducing detection costs.

[0006] The present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides an electric energy metering device for charging pile error self-checking, comprising: a local electric energy sensor and a common electric energy sensor;

[0008] One side of the local power sensor is connected in series with one side of the public power sensor through a wire to monitor the power of the charging pile where the local power sensor is located;

[0009] The other side of the common electric energy sensor is provided with a first port and a second port in parallel, the first port is used for serial connection with an AC / DC converter, and the second port is used for serial connection with an output end of a second local electric energy sensor in an adjacent second electric energy metering device;

[0010] A third port is also led out between the public power sensor and the connection port of the local power sensor for connecting to the charging gun of this pile.

[0011] On the other side of the local power sensor, a fourth port is provided for connecting to the second port in the adjacent third power metering device.

[0012] Among them, the error calibration of one of the power metering devices and the public power sensor in the adjacent power metering device connected to its fourth port is realized by connecting external standard power sensors between the power metering devices. Then, taking the public power sensor of the calibrated power metering device as a link, the error detection of the public power sensor and the local power sensor in the adjacent power metering device is obtained and calibrated, so as to recursively realize the error detection of each charging metering device.

[0013] Preferably, in the charging pile system architecture, the error calibration of one of the power metering devices and the public power sensor in the adjacent power metering device connected to its fourth port by connecting external standard power sensors between the power metering devices specifically includes:

[0014] Select the first charging pile. The power metering function in the first charging pile is completed by the power metering device. A standard power sensor is connected in series on the self - circuit of the corresponding metering device to form a self - inspection error circuit of the first charging pile.

[0015] When the charging pile where the adjacent charging metering device of the power metering device of the first charging pile exits the charging operation, the charging gun is in the vacant state, the switch between the power metering device and the AC - DC converter of the charging pile is in the off state, and the charging gun of the first charging pile and the switch between the power metering device and the AC - DC converter of the first charging pile are closed, so as to complete the error calibration of the power metering device of the first charging pile and the public power sensor in the adjacent power metering device on the self - inspection error circuit of the first charging pile.

[0016] Preferably, taking the public power sensor of the calibrated power metering device as a link specifically means:

[0017] In addition to the local power sensor and the public power sensor in the power metering device, the self - inspection circuit of the charging pile after installing the power metering device also includes the public power sensor of the power metering device of the adjacent charging pile.

[0018] After calibrating the power sensors on its self-checking circuit, the common power sensors of the power metering devices of adjacent charging piles can be used as standard power sensors to calibrate the power sensors on the self-checking circuits of adjacent charging piles. The common power sensors of adjacent charging piles serve as a link to achieve the self-check of the power metering devices of the charging pile cluster.

[0019] Preferably, the error detection of each charging metering device is recursively realized, specifically including:

[0020] After completing the error detection and calibration of one of the power metering devices, connect the self-checking circuit of the charging pile that includes adjacent metering devices, and keep the self-checking circuits of other charging piles in a disconnected state. Use the common power sensor of the calibrated adjacent metering device as a standard power sensor to realize the error self-check of the adjacent circuit metering device;

[0021] Sequentially detect one by one from the power metering devices of the charging piles connected to the self-checking circuit with the standard power sensor to both sides until the error self-check of the power metering devices of each charging pile in the charging pile cluster is completed.

[0022] Preferably, the error self-check system of the charging pile power metering device further includes a power data collector and a calculation system;

[0023] Among them, the power data collector is used to collect the metering values of the local power sensors, common power sensors, and standard power sensors of the power metering devices of each charging pile and transmit them to the calculation system;

[0024] The calculation system is used to complete the calculation of the metering errors of the local power sensors and common power sensors of the power metering devices of each charging pile.

[0025] Preferably, the charging pile cluster circuit further includes:

[0026] There is a toggle switch or a wireless transmitter in the charging gun of each charging pile;

[0027] Among them, the toggle switch is used to be in a closed state when the charging gun is working, so as to trigger the switch located between the power metering device and the AC-DC converter of the charging pile to be in a closed state; it is also used to be in an open state when the charging gun is idle, so as to trigger the switch located between the power metering device and the AC-DC converter of the charging pile to be in an open state;

[0028] Wherein, the wireless transmitter is configured to transmit a first wireless signal when the charging gun is in operation, thereby triggering a switch located between the energy metering device and the AC / DC converter of the charging pile to be in a closed state; and is further configured to transmit a second wireless signal when the charging gun is idle, thereby triggering the switch located between the energy metering device and the AC / DC converter of the charging pile to be in an open state.

[0029] Preferably, when performing the error detection of the energy metering device of each charging pile, it is necessary to switch the charging state to the error self-check state, specifically: the corresponding charging state and error self-check state are the states when switching to the corresponding line. At this time, there are no connected contacts between the energy metering device and the power supply circuits of each charging pile, presenting an electrically isolated state; and it shows that in the corresponding connection relationship, the energy metering devices of each charging pile are sequentially connected to the corresponding ports by the detection wires.

[0030] Preferably, the two electrodes of the standard energy sensor are set as pluggable plugs, and the pluggable plugs are matched with the charging gun.

[0031] Preferably, the energy sensor in the energy metering device of the charging pile and the standard energy sensor for detection are both composed of an energy metering sensor and a standard energy meter, and the measurement error is composed of the error of the energy metering sensor and the error of the standard energy metering device for detection.

[0032] In a second aspect, the present invention further provides a method for self-checking the error of an energy metering device. By using the energy metering device for charging pile error self-checking described in the first aspect, a charging line of a charging pile is selected as the self-checking line, and a standard energy sensor is externally connected to calibrate the common energy sensors in the energy metering device on the self-checking line of the charging pile and the energy metering devices of adjacent charging piles. Using the calibrated common energy sensors in the energy metering devices of adjacent charging piles as a link, through a recursive method, the self-checking of the energy metering devices of each charging pile in the charging pile cluster is realized.

[0033] In a third aspect, the present invention further provides an energy metering device for charging pile error self-checking, including: an auxiliary energy sensor, a local energy sensor, and a common energy sensor;

[0034] One side of the local energy sensor is connected in series with one side of the common energy sensor through a wire, and is used to monitor the electric energy of the charging pile where the local energy sensor is located;

[0035] On the other side of the public power sensor, a first port and a second port are connected in parallel. The first port is used for connecting in series with an AC-DC converter, and the second port is used for connecting in series with the output end of the second local power sensor in an adjacent second power metering device. Among them, the auxiliary power sensor is arranged between the second port and the public power sensor, and forms a parallel relationship with respect to the connection between the first port and the public power sensor. The auxiliary power sensor switches through a switch the electrical energy introduced from the second port to be the electrical energy data of an adjacent charging pile or the electrical energy data generated inside the pile itself.

[0036] A third port is also led out between the connection port of the public power sensor and the local power sensor for connecting with an adjacent charging gun.

[0037] On the other side of the local power sensor, a fourth port is provided for connecting in series with the second port in an adjacent third power metering device.

[0038] Among them, taking the public power sensor of the calibrated power metering device as a link, the error detection of the public power sensor and the local power sensor in the adjacent power metering device is obtained and calibrated, so as to recursively realize the error detection of each charging metering device.

[0039] Preferably, the auxiliary power sensor switches through a switch the electrical energy introduced from the second port to be the electrical energy data of an adjacent charging pile or the electrical energy data generated inside the pile itself, specifically including:

[0040] When the adjacent charging pile electrically connected to the second port is in an unoperated state, the switch switches the electrical energy introduced from the second port to be the electrical energy data generated inside the pile itself; and the charging gun of the pile is set to an operated state.

[0041] At this time, the sum of the electrical energy data passing through the auxiliary power sensor and the electrical energy data passing through the local power sensor satisfies the law of conservation of electrical energy with the electrical energy data passing through the public power sensor.

[0042] Preferably, one of the auxiliary power sensor, the local power sensor and the public power sensor is selected as a reference standard meter, and the true error detection of the reference standard meter is completed by removing the corresponding reference standard meter for true error detection of the reference standard meter or by connecting a standard meter in series.

[0043] Using the true error detection result of the reference standard meter and the relationship that satisfies the law of conservation of electrical energy, the remaining two power sensors among the auxiliary power sensor, the local power sensor and the public power sensor except the reference standard meter are calculated, so as to complete the error calibration of the local power sensor.

[0044] Preferably, the public power sensor of the calibrated electric energy metering device is used as a link, specifically:

[0045] In addition to the local power sensor and the public power sensor in the electric energy metering device on the self-checking line of the charging pile after installing the electric energy metering device, the public power sensor of the electric energy metering device of the adjacent charging pile is also included;

[0046] After calibrating the power sensors on its self-checking line, the public power sensor of the electric energy metering device of the adjacent charging pile can be used as a standard power sensor to calibrate the power sensors on the self-checking line of the adjacent charging pile. The public power sensor of the adjacent charging pile is used as a link to realize the self-check of the electric energy metering devices of the charging pile cluster.

[0047] Preferably, the error detection of each charging metering device is recursively realized, specifically including:

[0048] After completing the error detection and calibration of one of the electric energy metering devices, select the self-checking line of the charging pile including the adjacent metering device for connection, and disconnect the self-checking lines of other charging piles. Use the calibrated public power sensor of the adjacent metering device as a standard power sensor to realize the error self-check of the adjacent circuit metering device;

[0049] Sequentially detect one by one from the electric energy metering device of the charging pile connected to the self-checking line with the standard power sensor to both sides until the error self-check of the electric energy metering devices of each charging pile in the charging pile cluster is completed.

[0050] Preferably, the error self-check system of the charging pile electric energy metering device further includes an electric energy data collector and a calculation system;

[0051] Among them, the electric energy data collector is used to collect the metering values of the local power sensor, the public power sensor, and the standard power sensor of the electric energy metering device of each charging pile, and transmit them to the calculation system;

[0052] The calculation system is used to calculate the metering errors of the local power sensor and the public power sensor of the electric energy metering device of each charging pile.

[0053] Preferably, the charging pile cluster line further includes:

[0054] A toggle switch or a wireless transmitter is provided in the charging gun of each charging pile;

[0055] Among them, the toggle switch is used to be in a closed state when the charging gun is working, so as to trigger the switch located between the electric energy metering device and the AC / DC converter of the charging pile to be in a closed state; it is also used to be in an open state when the charging gun is idle, so as to trigger the switch located between the electric energy metering device and the AC / DC converter of the charging pile to be in an open state.

[0056] Among them, the wireless transmitter is used to send a first wireless signal when the charging gun is working, so as to trigger the switch located between the energy metering device and the AC / DC converter of the charging pile to be in a closed state; it is also used to send a second wireless signal when the charging gun is idle, so as to trigger the switch located between the electric energy metering device and the AC / DC converter of the charging pile to be in an open state.

[0057] Preferably, when detecting the error of the electric energy metering device of each charging pile, the charging state needs to be switched to the error self-check state. Specifically: the corresponding charging state and error self-check state are the states when switching to the corresponding line. At this time, there is no connected contact between the electric energy metering device and the power supply circuit of each charging pile, showing an electrically isolated state; and it shows that in the corresponding connection relationship, the electric energy metering devices of each charging pile are sequentially connected to the corresponding ports by the detection wire.

[0058] Preferably, the electric energy sensor in the electric energy metering device of the charging pile and the standard electric energy sensor for detection are both composed of an electric energy metering sensor and a standard electric energy meter, and the measurement error is composed of the error of the electric energy metering sensor and the error of the standard electric energy metering device for detection.

[0059] In a fourth aspect, the present invention also provides a method for self-checking the error of an electric energy metering device, which is characterized in that by using the electric energy metering device for self-checking the error of a charging pile according to any one of claims 1-9, selecting a charging line of a charging pile as a self-check line, and realizing the calibration of the electric energy metering device on the self-check line of the charging pile and the common electric energy sensor in the electric energy metering device of the adjacent charging pile by externally connecting a standard electric energy sensor, and using the common electric energy sensor in the calibrated electric energy metering device of the adjacent charging pile as a link, the self-check of the electric energy metering devices of each charging pile in the charging pile cluster is realized in a recursive manner.

[0060] The power metering device of the present invention replaces the metering module of the existing direct-connected charging pile. The corresponding ports of the power metering devices of each charging pile are connected through wires to connect the charging pile cluster together, obtaining the error self-checking circuit of the power metering device of each charging pile. Then, a charging pile is selected, and a standard power sensor is set on the error self-checking circuit of this charging pile. By comparing the metering readings of the standard power sensor and the local power sensors of each series-connected charging pile, the error self-checking of the power metering device of this charging pile is realized. Then, the error self-checking of adjacent power metering devices is realized through the common power sensor of adjacent power metering devices after calibration. In this way, the error self-checking of each charging pile in the charging pile cluster is realized recursively, improving the error detection efficiency of the charging pile and reducing the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0062] Figure 1 It is a schematic structural diagram of a power metering device for error self-checking of a charging pile provided in Embodiment 1 of the present invention;

[0063] Figure 2 It is a self-checking flow chart of a power metering device for error self-checking of a charging pile provided in Embodiment 1 of the present invention;

[0064] Figure 3 It is a circuit diagram after a power metering device for error self-checking of a charging pile provided in the embodiments of the present invention is connected to a charging pile cluster;

[0065] Figure 4 It is an equivalent circuit diagram for error self-checking of a power metering device for error self-checking of a charging pile provided in Embodiment 1 of the present invention;

[0066] Figure 5 It is a schematic structural principle diagram of a toggle switch provided in Embodiment 1 of the present invention;

[0067] Figure 6 It is a schematic structural diagram of a power metering device for error self-checking of a charging pile provided in Embodiment 3 of the present invention;

[0068] Figure 7 It is a self-checking flow chart of a power metering device for error self-checking of a charging pile provided in Embodiment 3 of the present invention;

[0069] Figure 8It is a schematic diagram of the architecture of a charging pile cluster in the prior art provided by an embodiment of the present invention;

[0070] Figure 9 It is a circuit diagram after a power metering device for self-checking the error of a charging pile is connected to a charging pile cluster provided by Embodiment 3 of the present invention;

[0071] Figure 10 It is an equivalent circuit diagram for self-checking the error of a power metering device for self-checking the error of a charging pile provided by Embodiment 3 of the present invention;

[0072] Figure 11 It is a schematic diagram of the connection relationship structure of an auxiliary power sensor provided by Embodiment 4 of the present invention. Detailed implementation manners

[0073] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0074] In the description of the present invention, the orientation or positional relationship indicated by terms such as "inner", "outer", "longitudinal", "lateral", "upper", "lower", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0075] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0076] Embodiment 1:

[0077] An embodiment of the present invention provides a power metering device for self-checking the error of a charging pile. The power metering device is circulated and used as an independent product. Two power sensors are integrated in the power metering device. One power sensor is used as a common power sensor, and the other power sensor is used as a local power sensor. The power metering device reserves a first port, a second port, a third port and a fourth port. The first port is used to be connected in series with a power sensor through an AC / DC converter, the second port is used to be connected in series with the output end of the local power sensor in an adjacent power metering device, the third port is used to be connected to the charging gun of this pile, and the fourth port is used to be connected to the common power sensor in another adjacent power metering device.

[0078] In actual use, one power metering device is correspondingly arranged for each charging pile, and the charging lines corresponding to different charging piles are cascaded together through the power metering device.

[0079] In an actual application scenario, the power metering device of this embodiment is used as an independent product. From the market side, the power metering device circulates as a specific product. From the engineering usage side, in actual use, the ports of the power metering device can be connected to different objects.

[0080] Embodiment 1 of the present invention provides a power metering device for self-checking the error of a charging pile, which focuses on protecting the power metering device with the product form described below, including: a local power sensor and a common power sensor;

[0081] One side of the local power sensor is connected in series with one side of the common power sensor through a wire, and is used to monitor the electric energy of the charging pile where the local power sensor is located;

[0082] A first port and a second port are connected in parallel on the other side of the common power sensor. The first port is used to be connected in series with an AC / DC converter, and the second port is used to be connected in series with the output end of the second local power sensor in an adjacent second power metering device;

[0083] A third port is also led out between the connection port of the common power sensor and the local power sensor, and is used to be connected to the charging gun of this pile;

[0084] A fourth port is provided on the other side of the local power sensor, and is used to be connected to the second port in an adjacent third power metering device;

[0085] Among them, the error calibration of one of the power metering devices and the common power sensor in the adjacent power metering device connected to its fourth port is realized by connecting external standard power sensors between each power metering device; then, taking the calibrated common power sensor of the power metering device as a link, the error detection of the common power sensor and the local power sensor in the adjacent power metering device is obtained and calibrated, so as to recursively realize the error detection of each charging metering device.

[0086] Such as Figure 1As shown, existing charging piles are isolated, and there is no connection relationship between them. The local power sensor of the charging pile is replaced with the power metering device of the embodiment of the present invention to transform the charging pile. Corresponding ports are set on the power metering device, and adjacent front and rear charging piles are interconnected through the ports, so that the originally isolated and directly connected charging piles are aggregated into a charging pile cluster. Only by installing a standard power sensor on the self-checking circuit of any one charging pile can all the power sensors on the self-checking circuits of each charging pile in the charging pile cluster be calibrated. Then, the calibrated common power sensor (there are 2 common power sensors on the error self-checking circuit of each charging pile) is used as the standard power sensor to realize the error self-check of the power metering devices of adjacent charging piles. And then, through this method, until the error self-check of the power metering devices of each charging pile in the charging pile cluster is completed. Compared with the traditional directly connected charging piles, the present invention does not need to install standard power sensors one by one on each charging pile and conduct one-by-one comparison and calibration, which greatly improves the efficiency of error verification of the charging pile. In addition, through the modularization of the power metering device of the present invention, the production manufacturer only needs to produce according to the present invention and set corresponding docking ports on the corresponding charging piles. Through the connection of the corresponding ports, the transformation of the charging pile can be completed, and the isolated charging piles can also be assembled together to form an interconnected charging pile cluster. Thus, the time spent on laying the circuit is saved, the operation is simple, and the production efficiency is improved. It should be noted that when a certain metering device is selected for description, the second port and the fourth port of the metering device are respectively connected to the adjacent previous and next power metering devices (if it is at the first position, there is no previous power metering device; if it is at the last position, there is no previous power metering device; if the power metering device to be connected does not exist, it is not connected). The adjacent first power metering device and the second power metering device of the embodiment of the present invention respectively correspond to the previous and next power metering devices of the selected metering device. To describe this solution more clearly, the embodiment of the present invention sets corresponding marks on the ports of the power metering device of each charging pile, such as Figure 1 , the four ports of the power metering device are marked as the first, second, third, and fourth ports, and the four ports of different power metering devices use a set of the same marks.

[0087] Next, the details of the embodiment of the present invention will be further elaborated. In the charging pile system architecture, the power metering devices are installed on each charging pile, and the power metering devices of adjacent charging piles are interconnected in pairs to form an error self-checking charging pile cluster circuit, as Figure 2 shown, which specifically includes:

[0088] Step 101: Select the first charging pile. The electric energy metering function in the first charging pile is completed by the electric energy metering device. A standard electric energy sensor is connected in series on the self - circuit of the corresponding metering device to form a self - inspection error circuit of the first charging pile.

[0089] Among them, the self - inspection error circuit of the first charging pile is actually connected in series with the common electric energy sensor of the charging metering device of the first charging pile and the subsequent electric energy metering device. As Figure 3 shown (for the sake of distinction, the local electric energy sensor of each end is represented by the corresponding Wi, and the value of i is the same as the corresponding charging pile number. And in the figure, the standard electric energy sensor is set on the connection line of the No. 1 charging gun), the fourth port of the electric energy metering device of the first charging pile is connected to the second port of the subsequent electric energy metering device through a wire. From the characteristics of the circuit, the common electric energy sensor of each electric energy metering device obtains the comprehensive value of the previous charging pile and the self - inspection error circuit of the charging pile where the metering device itself is located. On the self - inspection error circuit of the first charging pile, the local electric energy sensor of the electric energy metering device of the first charging pile can be directly calibrated through the standard electric energy sensor. The standard electric energy sensor obtains the value of the self - inspection error circuit of the first charging pile, and the influence of the previous charging pile needs to be eliminated. At this time, the self - inspection error circuit of the previous charging pile needs to be disconnected. Similarly, the self - inspection error circuit of the corresponding first charging pile is connected in series with the common electric energy sensor of the subsequent electric energy metering device. At this time, when calibrating it on the self - inspection error circuit of the first charging pile, the self - inspection error circuit of the subsequent charging pile needs to be disconnected. For example: as Figure 3 shown, when the first charging pile is the charging pile numbered 3, the previous charging pile at this time represents the charging pile numbered 2 in the figure, and the subsequent charging pile is the charging pile numbered 4; when the first charging pile is at the first position, the previous charging pile does not exist, and when the first charging pile is at the last position, the subsequent charging pile does not exist. The disconnection effect between non - existent charging piles is the same and will not cause any impact on the embodiment scheme of the present invention.

[0090] On the self - inspection error circuit of the first charging pile in the embodiment of the present invention, a standard electric energy sensor is connected in series to calibrate the electric energy metering device on the self - inspection error circuit of the first charging pile and the common electric energy sensor of the adjacent common electric energy metering device (subsequent electric energy metering device). Then, the two calibrated common electric energy sensors are used as standard electric energy sensors, and the inspection is carried out one by one from the first charging pile to both ends respectively, and finally the self - inspection of the electric energy metering devices of each charging pile is realized.

[0091] Step 102: When the charging pile where the charging metering device adjacent to the power metering device of the first charging pile exits the charging operation, the charging gun is in an idle state, the switch located between the power metering device and the AC / DC converter of the charging pile is in an open state, and the charging gun of the first charging pile and the switch of the first charging pile located between the power metering device and the AC / DC converter of the charging pile are closed, so as to complete the error calibration of the power metering device of the first charging pile and the common power sensors in the adjacent power metering devices on the self-check error line of the first charging pile.

[0092] Among them, in the process of detection in the embodiment of the present invention, all the power sensors (including two common power sensors and one local power sensor) on the self-check line of a certain charging pile are calibrated first, and then the two calibrated common power sensors are used as standard power sensors to calibrate towards both ends one by one. When calibrating the power sensor or power metering device on the self-check line of a certain charging pile, the self-check lines of the previous and the next charging piles need to be in an open state. The switch located between the power metering device and the AC / DC converter of the charging pile in the embodiment of the present invention is one of the improvement points proposed in the embodiment of the present invention. In the prior art, it usually shows that a charging pile is equipped with two independent charging guns, and an AC / DC converter can be independently connected to each of the metering devices. For better illustration, in the embodiment of the present invention, one charging pile corresponds to one charging gun, and one metering device corresponds to one AC / DC converter for description. Essentially, the description method selected in the embodiment of the present invention does not conflict with the existing charging pile existence method. When performing the error self-check of the power metering device of the first charging pile, only the error self-check line of the previous charging pile needs to be in an idle state. Here, the idle state is the open state. However, considering the detection method towards both sides, in actual detection, the error self-check lines of the previous and the next charging piles of the first charging pile are both in an idle state. Analyzing from the perspective of the circuit diagram, theoretically, as long as any one of the switch of the charging gun and the switch between the power metering device and the AC / DC converter of the charging pile on the error self-check line of the charging pile is in an open state, it can be achieved. Considering that the present invention has made an improved association between the charging gun and the switch of the AC / DC converter of the charging pile. For the rigor of the scheme, when the charging pile exits the charging operation, both switches are described as in an empty state. The adjacent power metering devices of the power metering device of the first charging pile in the embodiment of the present invention include two metering devices, the previous and the next one, which have been described before and will not be elaborated here.

[0093] The embodiment of the present invention detects the power metering error of the charging pile cluster in a recursive manner, and provides an error self-check line of the power metering device of the charging pile cluster including the error detection lines of each charging pile, which improves the charging pile error detection efficiency and reduces the detection cost.

[0094] For the following description of the technical solution, a charging pile corresponding to a charging gun is taken as an example scenario, and Figure 4 is used to illustrate the series connection relationship of the error self-checking circuits of the power metering devices of each charging pile. It should be noted that in order to avoid the situation of content coverage caused by too many labeled objects in the attached drawings, therefore, Figure 3 in does not label the four ports of the power metering devices of each charging pile. The corresponding ports refer to Figure 1 . By installing corresponding ports on the power metering device in the embodiment of the present invention and connecting the corresponding ports of the power metering devices of adjacent charging piles before and after through wires to form an interconnection relationship, the error self-checking circuit of the power metering device of the charging pile cluster is obtained.

[0095] After the above content is expanded, the core part of the construction method for detecting the metering error of the charging pile cluster proposed by the present invention has been presented. If the power metering device as shown in Figure 3 is to be applied to a specific detection method, it also includes using the common power sensor of the calibrated power metering device as a link to recursively realize the error self-check of each metering device. Among them, using the common power sensor of the calibrated power metering device as a link specifically means:

[0096] In addition to the local power sensor and the common power sensor in the power metering device on the self-checking circuit of the charging pile after installing the power metering device, the common power sensors of the power metering devices of adjacent charging piles are also included;

[0097] After calibrating the power sensors on its self-checking circuit, the common power sensors of the power metering devices of adjacent charging piles can be used as standard power sensors to calibrate the power sensors on the self-checking circuits of adjacent charging piles. The common power sensors of adjacent charging piles are used as a link to realize the self-check of the power metering devices of the charging pile cluster. The error detection of each charging metering device is recursively realized, specifically including:

[0098] After completing the error detection and calibration of one power metering device, select the self-checking circuits of the charging piles including adjacent metering devices for connection, and disconnect the self-checking circuits of other charging piles. Use the common power sensor of the calibrated adjacent metering device as a standard power sensor to realize the error self-check of the adjacent circuit metering device;

[0099] Sequentially detect one by one from the power metering device of the charging pile connected to the self-checking circuit with the standard power sensor to both sides until the error self-check of the power metering devices of each charging pile in the charging pile cluster is completed.

[0100] Among them, there are two common power sensors on each error self-checking circuit of the charging pile, including the common power sensor of the charging pile power metering device and the common power sensor of the adjacent charging pile power metering device. After calibrating these two power sensors, the common power sensor of the charging pile power metering device itself can be used as the standard power sensor of the power metering device of the previous charging pile for calibration work, and the common power sensor of the adjacent charging pile power metering device can be used as the standard power sensor of the power metering device of the next charging pile for calibration work. Through this method, the error self-checking of each charging pile power metering device is realized recursively. The error self-checking system of the charging pile power metering device also includes a power data collector and a calculation system; among them, the power data collector is used to collect the metering values of the local power sensor, the common power sensor, and the standard power sensor of the power metering device of each charging pile, and transmit them to the calculation system; the calculation system is used to complete the calculation of the metering errors of the local power sensor and the common power sensor of the power metering device of each charging pile. Among them, the transmission method usually uses wireless transmission, such as transmission through the Bluetooth protocol, transmission through the wifi network, or transmission through the 5G network, etc.

[0101] In the embodiment of the present invention, when detecting the error of each charging pile power metering device, it is necessary to switch the charging state to the error self-checking state. Specifically: the corresponding charging state and the error self-checking state are the states when switching to the corresponding line. At this time, there is no connected contact between the power metering device and the power supply circuit of each charging pile, showing an electrically isolated state; and it shows that in the corresponding connection relationship, the power metering devices of each charging pile are sequentially connected to the corresponding ports by detection wires, as Figure 4 shown, which is the equivalent circuit diagram for error self-checking of the power metering devices of each charging pile. As Figure 3 shown, each charging pile in the figure corresponds to an AC / DC converter A / D and a charging gun, and a switch is set between the metering unit and the AC / DC converter. The construction method of the corresponding switch also includes:

[0102] A toggle switch or a wireless transmitter is provided in the charging gun of each charging pile;

[0103] Among them, the toggle switch is used to be in a closed state when the charging gun is working, so as to trigger the switch located between the power metering device and the AC / DC converter of the charging pile to be in a closed state; it is also used to be in an open state when the charging gun is idle, so as to trigger the switch located between the power metering device and the AC / DC converter of the charging pile to be in an open state; as Figure 5 shown, the most suitable placement position of the toggle switch is on the side wall of the charging port of the charging gun. Utilizing the characteristic that the charging gun is plugged into the charging port on the vehicle, the charging male port on the vehicle pushes open the toggle switch arranged on the side wall of the charging female port of the charging gun, so that Figure 5The shown toggle switch is closed, and the corresponding toggle switch is connected to the AC / DC converter switch of the corresponding charging pile. The corresponding switch belongs to a weak-current controlled electromagnetic switch. That is, when the toggle switch is closed, a corresponding weak-current forms a loop and provides an electromagnetic adsorption force to the electromagnetic switch, thus completing as Figure 5 shown by the closing of the electromagnetic switch, so as to ensure that after having the improved structure as Figure 5 shown, only when charging a load such as an electric vehicle, the metering unit of the corresponding charging pile will be connected to the power circuit of the charging pile. Otherwise, the local power sensor is in an electrically isolated state relative to the charging pile. In the entire charging pile cluster, each charging gun is in an off state. By closing the error self-checking line in series with the standard power sensor, the error self-checking and calibration of this charging pile are realized. Then, by disconnecting the switch of the previous charging gun and closing the switch of a charging gun of an adjacent charging pile, the error self-checking of the power metering device of the adjacent charging pile is realized. Through this method, the error self-checking of the power metering devices of all charging piles is recursively obtained and calibrated (during the detection process, it should be ensured that the charging lines of the previous and the next charging piles of the charging pile to which the power metering device to be detected belongs are in an off state).

[0104] Among them, the wireless transmitter is used to send a first wireless signal when the charging gun is working, so as to trigger the switch located between the energy metering device and the AC / DC converter of the charging pile to be in a closed state; it is also used to send a second wireless signal when the charging gun is idle, so as to trigger the switch located between the power metering device and the AC / DC converter of the charging pile to be in an open state. Compared with Figure 5 the shown structure, here, if a wireless transmitter is used, because it is necessary to ensure that when the charging gun is not working, the switch between the AC / DC power supply and the power metering device as Figure 3 shown needs to be in an open state. In this case, the wireless transmitter lacks power supply, and when the charging gun is inserted into the charging interface of the load object, it cannot send the first wireless signal. Therefore, during the implementation process of the embodiment of the present invention, it is utilized that the charging interface of the load to be charged (such as an electric vehicle) will also release current after being connected with the charging gun. Therefore, the power interface of the wireless transmitter can be connected to the power supply interface of the charging gun, so that when the charging gun is inserted into the load for charging, first, the remaining electricity in the load supplies power to the wireless transmitter to send the first wireless signal, thus completing Figure 3 shown by the closing of the switch on the side of the AC / DC converter, enabling the charging gun to be connected to the AC / DC converter, and thus entering the normal charging state.

[0105] In addition, the two electrodes of the standard power sensor are set as pluggable plugs, and the pluggable plugs are matched with the charging gun. By means of plugging and unplugging, the detection is made more efficient.

[0106] In the embodiments of the present invention, both the power sensor in the charging pile power metering device and the standard power sensor for detection are composed of a power metering sensor and a standard watt-hour meter, and the metering error is composed of the error of the power metering sensor and the error of the standard power metering device for detection.

[0107] Embodiment 2:

[0108] The embodiments of the present invention provide a method for self-checking the error of a power metering device. Based on the power metering device for self-checking the error of a charging pile in Embodiment 1, a charging line of a charging pile is selected as the self-checking line, and a standard power sensor is externally connected to calibrate the common power sensor in the power metering device on the self-checking line of the charging pile and the power metering devices of adjacent charging piles. Using the calibrated common power sensor in the power metering devices of adjacent charging piles as a link, through a recursive method, self-checking of each power metering device in the charging pile cluster is realized.

[0109] Embodiment 3:

[0110] In terms of the product form of the power metering device, this embodiment expands the power metering device in Embodiment 1. Different from Embodiment 1, this embodiment provides another power metering device for self-checking the error of a charging pile. The power metering device further includes an auxiliary power sensor, which is arranged between the second port and the common power sensor and is in a parallel relationship with respect to the connection between the first port and the common power sensor; the power introduced by the auxiliary power sensor through switch switching from the second port is the power data of an adjacent charging pile or the power data generated inside this pile.

[0111] According to the method of this embodiment, the power signal that originally entered the common power sensor through one line is artificially split into a part that passes through the auxiliary power sensor and finally combined onto the common power sensor, thus forming an energy conservation system where the power detected by the auxiliary power sensor + the power detected by the local power sensor = the power detected by the common power sensor. In actual operation, the auxiliary power sensor can be made into a pluggable structure. Thus, after removing the auxiliary power sensor to complete the inspection of its own error, relying on the above energy conservation relationship to calculate the metering errors of the local power sensor and the common power sensor, and using the calibrated common power sensor of the power metering device as a link, obtaining the error detection of the common power sensor and the local power sensor in the adjacent power metering devices and performing calibration, thereby recursively realizing the error detection process of each charging metering device.

[0112] Embodiment 3 of the present invention provides a power metering device for self-checking the error of a charging pile, including: an auxiliary power sensor, a local power sensor, and a common power sensor;

[0113] One side of the local power sensor is connected in series with one side of the public power sensor through a wire, and is used to monitor the power of the charging pile where the local power sensor is located;

[0114] The other side of the public power sensor is provided with a first port and a second port in parallel. The first port is used for series connection with an AC / DC converter, and the second port is used for series connection with the output end of the second local power sensor in the adjacent second power metering device; wherein, the auxiliary power sensor is arranged between the second port and the public power sensor, and forms a parallel relationship with respect to the connection between the first port and the public power sensor; the auxiliary power sensor switches through a switch to introduce the power of the adjacent charging pile or the power data generated inside the pile from the second port;

[0115] A third port is also led out between the connection port of the public power sensor and the local power sensor, and is used for connection with an adjacent charging gun;

[0116] The other side of the local power sensor is provided with a fourth port, which is used for series connection with the second port in the adjacent third power metering device;

[0117] Among them, taking the public power sensor of the calibrated power metering device as a link, the error detection of the public power sensor and the local power sensor in the adjacent power metering device is obtained and calibrated, so as to recursively implement the error detection of each charging metering device.

[0118] Such as Figure 6As shown in the figure, by setting corresponding ports on the error self-checking power metering device provided in the embodiment of the present invention and interconnecting adjacent front and rear charging piles through the ports, the originally isolated and directly connected charging piles are aggregated into a charging pile cluster. Only after the metering error of the common power sensor included in the local power metering device proposed in the embodiment of the present invention is effectively calculated, can all the power sensors on the self-checking lines of each charging pile in the charging pile cluster be calibrated. Then, the common power sensors of the calibrated adjacent power metering devices are used as standard power sensors to realize the error self-checking of the power metering devices of adjacent charging piles. This method is repeated until the error self-checking of the power metering devices of each charging pile in the charging pile cluster is completed. Compared with the traditional directly connected charging piles, the present invention does not require installing standard power sensors one by one on each charging pile and performing one-by-one comparison and calibration, which greatly improves the efficiency of error verification of charging piles. In addition, through the modularization of the power metering device of the present invention, the manufacturer only needs to produce according to the present invention and set corresponding docking ports on the corresponding charging piles to complete the transformation of the charging piles, thus saving the time spent on laying circuits, with simple operation and improved production efficiency. It should be noted that when a certain power metering device is selected for description, the second port and the fourth port of the power metering device are respectively connected to the adjacent previous and next power metering devices. The adjacent first power metering device and the second power metering device in the embodiment of the present invention respectively correspond to the previous and next power metering devices of the selected metering device.

[0119] The electric energy introduced by the auxiliary power sensor through switch switching from the second port is the electric energy data of the adjacent charging pile or the electric energy data generated inside the local pile, specifically including:

[0120] When the adjacent charging pile electrically connected to the second port is in an unoperated state, the electric energy introduced by the switch switching from the second port is the electric energy data generated inside the local pile; and the charging gun of the local pile is set to the operating state;

[0121] At this time, the sum of the electric energy data passing through the auxiliary power sensor and the electric energy data passing through the local power sensor satisfies the law of conservation of electric energy with the electric energy data passing through the common power sensor.

[0122] Select one of the auxiliary power sensor, the local power sensor, and the common power sensor as the reference standard meter, and complete the real error detection of the reference standard meter by removing the corresponding reference standard meter for real error detection of the reference standard meter or by connecting the standard meter in series.

[0123] Using the true error detection result of the reference standard table and the relationship that satisfies the law of conservation of electric energy, calculate the remaining two electric energy sensors among the auxiliary electric energy sensor, the local electric energy sensor, and the public electric energy sensor except the reference standard table, so as to complete the error calibration of the local electric energy sensor.

[0124] Next, further elaboration will be made on the details of the embodiments of the present invention. In the charging pile system architecture, by installing an electric energy metering device on each charging pile, the electric energy metering devices of adjacent charging piles are interconnected in pairs to form a charging pile cluster line for self-checking errors, as Figure 7 shown, specifically including:

[0125] Step 201: After replacing the metering module in the conventional existing first charging pile with the electric energy metering device proposed in the embodiments of the present invention, connect a standard electric energy sensor in series on the self-circuit of the corresponding metering device, so as to complete the self-checking error line of the charging pile.

[0126] In the embodiments of the present invention, connecting the electric energy metering device into the charging pile can be in a permanently fixed connection manner, or the connection of the electric energy metering device can be temporarily completed before the charging pile error detection.

[0127] Step 202: When other charging piles in the charging pile cluster exit the charging operation, the charging guns of each charging pile are in the vacant state, and the switch located between the electric energy metering device and the AC / DC converter of the charging pile is in the off state. Close the charging gun of the first charging pile and the switch located between the electric energy metering device and the AC / DC converter of the first charging pile, so as to obtain the self-checking line of the electric energy metering device error of the first charging pile.

[0128] The above-mentioned charging pile exiting the charging operation and the charging gun being in the vacant state are actually equivalent concepts. The difference is that the former is described from the overall perspective of the charging pile, while the latter is a state description specifically from the perspective of the charging gun. The switch located between the electric energy metering device and the AC / DC converter of the charging pile is one of the improvement points proposed in the embodiments of the present invention, as Figure 8 shown, which is a schematic diagram of the architecture of an existing charging pile cluster. In the prior art, usually one charging pile is equipped with two independent charging guns, and each metering device can be independently connected to an AC / DC converter. For better illustration, the embodiments of the present invention select one charging pile corresponding to one charging gun and one metering device corresponding to one AC / DC converter for description. Essentially, the description method selected in the embodiments of the present invention does not conflict with the existing charging pile mode.

[0129] Step 203: Use a standard power sensor to detect the error of the first charging pile and calibrate the common power sensors in the power metering devices of adjacent charging piles; Use the calibrated common power sensors in the power metering devices of adjacent charging piles as the standard meters of adjacent charging piles, and obtain the self-check errors of the common power sensors and the local power sensors in the power metering devices of adjacent charging piles; Thus, the self-check of the power metering devices in the charging pile cluster is realized through recursion.

[0130] The error self-check circuit of the first charging pile includes the common power sensors of two adjacent power metering devices and the local power sensor of the charging pile itself. By externally connecting a standard power sensor in series on the error self-check circuit of the first charging pile, the error detection and calibration of all power sensors on the error self-check circuit of the first charging pile are realized. Then, use the calibrated common power sensor as the standard power sensor to calibrate the adjacent power metering devices on the error self-check circuit of the adjacent charging pile. Then, the self-check of the power metering devices in the charging pile cluster is realized through recursion.

[0131] The embodiment of the present invention detects the power metering error of the charging pile cluster in a recursive manner, and provides an error self-check circuit for the power metering devices in the charging pile cluster including the error detection circuits of each charging pile, improving the charging pile error detection efficiency and reducing the detection cost.

[0132] In the embodiment of the present invention, the error detection circuits of each charging pile are obtained by laying out detection wires, as Figure 9 shown (for the sake of distinction, the local power sensors of each are represented by corresponding Wi, the value of i is the same as the corresponding charging pile number, and the standard power sensor in the figure is set on the connection line of the No. 1 charging gun), specifically including:

[0133] Select the first charging pile. After connecting to the power metering device, connect a standard power sensor in series on the self-circuit of the corresponding metering device to form the self-check error circuit of the first charging pile;

[0134] When other charging piles are out of charging operation, the charging guns are in the vacant state, and the switches located between the power metering device and the AC / DC converter of the charging pile are in the off state. Close the charging gun of the first charging pile and the switch located between the power metering device and the AC / DC converter of the first charging pile, so as to obtain the error self-check circuit of the power metering device of the first charging pile.

[0135] Use a standard power sensor to detect the error of the first charging pile and calibrate the common power sensor in the power metering device of the adjacent charging piles; use the calibrated common power sensor in the power metering device of the adjacent charging piles as the standard meter of the adjacent charging piles, and obtain the self-checking errors of the common power sensor and the local power sensor in the power metering device of the adjacent charging piles; thus, realize the self-checking of the power metering devices in the charging pile cluster through recursion.

[0136] For the following description of the technical solution, take one charging pile corresponding to one charging gun as an example scenario, and Figure 10 describe the series connection relationship of the error self-checking circuits of the power metering devices of each charging pile. It should be noted that, in order to avoid the situation of content coverage caused by too many labeled objects in the attached drawings, therefore, Figure 10 the four ports of the power metering devices of each charging pile are not marked in Figure 6 . Install corresponding ports on the power metering device in the embodiment of the present invention, and form an interconnection relationship by connecting the corresponding ports of the power metering devices of the adjacent charging piles before and after through wires, so as to obtain the error self-checking circuit of the power metering devices in the charging pile cluster.

[0137] After the above content is expanded, the core part of the construction method for detecting the metering error of the charging pile cluster proposed by the present invention has been shown. If the power metering device as shown in Figure 9 is to be applied to a specific detection method, it further includes using the calibrated common power sensor of the power metering device as a link to realize the error self-checking of each metering device through recursion. Among them, using the calibrated common power sensor of the power metering device as a link specifically means:

[0138] In addition to including the local power sensor and the common power sensor in the power metering device on the self-checking circuit of the charging pile after installing the power metering device, it also includes the common power sensor of the power metering device of the adjacent charging pile;

[0139] After calibrating the power sensors on its self-checking circuit, the common power sensor of the power metering device of the adjacent charging pile can be used as a standard power sensor to calibrate the power sensors on the self-checking circuit of the adjacent charging pile. The common power sensor of the adjacent charging pile serves as a link to realize the self-checking of the power metering devices in the charging pile cluster.

[0140] The recursive realization of the error detection of each charging metering device specifically includes:

[0141] After the error detection and calibration of one of the electric energy metering devices, select the self-checking circuit of the charging pile that includes adjacent metering devices for connection, and keep the self-checking circuits of other charging piles in a disconnected state. Use the common electric energy sensor of the calibrated adjacent metering device as the standard electric energy sensor to achieve the error self-check of the adjacent circuit metering device;

[0142] Sequentially detect one by one from the electric energy metering devices of the charging piles connected to the self-checking circuit of the standard electric energy sensor to both sides until the error self-check of the electric energy metering devices of each charging pile in the charging pile cluster is completed.

[0143] The error self-check system of the charging pile electric energy metering device further includes an electric energy data collector and a calculation system; wherein, the electric energy data collector is used to collect the metering values of the local electric energy sensor, the common electric energy sensor, and the standard electric energy sensor of the electric energy metering devices of each charging pile and transmit them to the calculation system; the calculation system is used to complete the calculation of the metering errors of the local electric energy sensor and the common electric energy sensor of the electric energy metering devices of each charging pile. Among them, the transmission method usually adopts wireless transmission, such as transmission through the Bluetooth protocol, transmission through the wifi network, or transmission through the 5G network, etc.

[0144] In the embodiment of the present invention, when performing the error detection of the electric energy metering device of each charging pile, it is necessary to switch the charging state to the error self-check state. Specifically: the corresponding charging state and the error self-check state are the states when switching to the corresponding circuit. At this time, the electric energy metering device has no connected contacts with the power supply circuits of each charging pile and is in an electrically isolated state; and it shows that in the corresponding connection relationship, the electric energy metering devices of each charging pile are sequentially connected to the corresponding ports by the detection wires, as Figure 10 shown, which is the equivalent circuit diagram for the error self-check of the electric energy metering devices of each charging pile. As Figure 9 shown, each charging pile in the figure corresponds to an AC / DC converter A / D and a charging gun, and a switch is provided between the metering unit and the AC / DC converter. The construction method of the corresponding switch further includes:

[0145] A toggle switch or a wireless transmitter is provided in the charging gun of each charging pile;

[0146] Among them, the toggle switch is used to be in a closed state when the charging gun is working, so as to trigger the switch located between the electric energy metering device and the AC / DC converter of the charging pile to be in a closed state; it is also used to be in an open state when the charging gun is idle, so as to trigger the switch located between the electric energy metering device and the AC / DC converter of the charging pile to be in an open state; as Figure 5As shown, the most suitable placement position of the toggle switch is on the side wall of the charging port of the charging gun. By utilizing the characteristic that the charging gun is plugged into the charging port on the vehicle, the toggle switch arranged on the side wall of the female charging port of the charging gun is pushed open by the male charging port on the vehicle, so that Figure 5 the shown toggle switch closes. The corresponding toggle switch is connected to the AC / DC converter switch of the corresponding charging pile. The corresponding switch belongs to a weak-current controlled electromagnetic switch. That is, when the toggle switch is closed, a corresponding weak-current forms a loop and provides an electromagnetic adsorption force to the electromagnetic switch, thereby completing the closing of the electromagnetic switch as shown in Figure 5 shown, so as to ensure that after having the improved structure as shown in Figure 5 only when charging a load such as an electric vehicle, the metering unit of the corresponding charging pile will be connected to the power supply circuit of the charging pile. Otherwise, the local power sensor is in an electrically isolated state relative to the charging pile. In the entire charging pile cluster, each charging gun is in an off state. By closing the error self-checking line in series with the standard power sensor, the error self-checking and calibration of the charging pile are realized. Then, by disconnecting the switch of the previous charging gun and closing the switch of a charging gun of an adjacent charging pile, the error self-checking of the power metering device of the adjacent charging pile is realized. Through this method, the error self-checking of the power metering devices of all charging piles is recursively obtained and calibrated.

[0147] Among them, the wireless transmitter is used to send a first wireless signal when the charging gun is working, so as to trigger the switch located between the energy metering device and the AC / DC converter of the charging pile to be in a closed state; it is also used to send a second wireless signal when the charging gun is idle, so as to trigger the switch located between the energy metering device and the AC / DC converter of the charging pile to be in an open state. Compared with the structure shown in Figure 5 if a wireless transmitter is used here, because it is necessary to ensure that when the charging gun is not working, the switch between the AC / DC power supply and the energy metering device as shown in Figure 9 needs to be in an open state. In this case, the wireless transmitter lacks power supply, and when the charging gun is inserted into the charging interface of the load object, the first wireless signal cannot be sent. Therefore, in the implementation process of the embodiment of the present invention, it is utilized that the charging interface of the load to be charged (such as an electric vehicle) will also release current after being connected to the charging gun. Therefore, the power supply interface of the wireless transmitter can be connected to the power supply interface of the charging gun, so that when the charging gun is inserted into the load for charging, first, the remaining power in the load supplies the wireless transmitter to send the first wireless signal, thereby completing the closing of the switch on the side of the AC / DC converter as shown in Figure 9 so that the charging gun is connected to the AC / DC converter and enters the normal charging state.

[0148] In addition, the two electrodes of the standard power sensor are set as pluggable plugs, and the pluggable plugs are matched with the charging gun. In this way, the detection is more efficient through plugging and unplugging.

[0149] In the embodiment of the present invention, the power sensor in the charging pile power metering device and the standard power sensor for detection are both composed of a power metering sensor and a standard power meter, and the measurement error is composed of the error of the power metering sensor and the error of the standard power metering device for detection.

[0150] Embodiment 4:

[0151] As Figure 11 shown, it is the connection structure of the auxiliary power sensor in the power metering device provided by the embodiment of the present invention as Figure 6 shown, and the actual characteristic performance of the switch switching between the adjacent voltage and the auxiliary voltage. In Figure 11 , the corresponding port identification names follow the identification method in Figure 6 .

[0152] In Figure 11 , the auxiliary power sensor adopted is a voltage sensor, and in the implementation manner, a current sensor can also be adopted. Since the two belong to the prior art in terms of principle mechanism, after the embodiment of the present invention provides how to implement the corresponding voltage sensor, those skilled in the art can correspondingly apply it to the current sensor. Therefore, the solution corresponding to the implementation using the current sensor also belongs to the protection scope of the present invention.

[0153] In Figure 11 , the introduction of the auxiliary voltage can be seen, and it is actually more complex than that presented in Figure 6 . The corresponding auxiliary voltage is provided by this charging pile. For example, in Figure 9 , the auxiliary voltage can be provided by the converter marked with A / D:2. In fact, it is to artificially split a part of the power signal that originally enters the common power sensor through a line, pass it through the auxiliary power sensor, and finally merge it onto the common power sensor, thereby forming an energy conservation system where the power detected by the auxiliary power sensor + the power detected by the local power sensor = the power detected by the common power sensor. In actual operation, the auxiliary power sensor can be made into a pluggable structure. Thus, after removing the auxiliary power sensor to complete the inspection of its own error, then rely on the above energy conservation relationship to calculate Figure 11The measurement errors of the local power sensor and the common power sensor shown, so as to further complete the process of using the common power sensor of the calibrated power metering device as a link as described in steps 201-203 of Embodiment 3, obtaining the error detection of the common power sensor and the local power sensor in the adjacent power metering device, and performing calibration, so as to recursively implement the error detection process of each charging metering device.

[0154] In Figure 9 only one line associated with the corresponding power sensor is presented, while in actual situations, the presentation of the corresponding lines is more complex. For example Figure 11 shown, for the auxiliary power sensor, it also uses the coil on the left side in Figure 11 to couple with the power circuit of the adjacent charging pile, so as to be able to collect the power data coming from the adjacent charging pile; and Figure 11 the coil on the right side in

[0155] is used to collect the auxiliary voltage generated inside the pile, that is, a part of the power that can be shunted as described above so that it can be detected by the auxiliary power sensor. Figure 11 also identifies the corresponding three switches, including two auxiliary voltage switches and one adjacent voltage switch. Their relationship is as described in Embodiment 3. If it is confirmed that the charging pile adjacent to this pile is not in the working state, the adjacent charging pile here specifically refers to Figure 9 the charging pile on the left side of the power metering device proposed in Embodiment 3 of the present invention. At this time, the adjacent voltage switch can be controlled to disconnect, and the two auxiliary voltage switches can be closed, so as to avoid the influence of the adjacent charging pile on the above energy conservation system. Once it is confirmed that the charging gun of the adjacent charging pile enters the working state, the two auxiliary voltage switches are disconnected, and the adjacent voltage switch is closed, so as to ensure that the adjusted charging pile cluster can be in the normal process of charging the electric vehicle. The switching between the above auxiliary voltage switch and the adjacent voltage switch can be realized by using a linkage mechanism with a structure as shown in Figure 5 shown, and no more details will be elaborated here.

[0156] Through the above Figure 11 shown connection relationship structure, it can not only ensure the normal operation of the charging pile cluster as shown in Figure 9 shown, but also realize an alternative implementation method other than similar Figure 9 series-connected standard meters; that is, taking the auxiliary power sensor that can be removed for error calibration as an opportunity, using the switching method described in the embodiments of the present invention to complete the calibration of the measurement errors of the local power sensor and the common power sensor in this pile, and relying on Figure 9The connection relationship of the metering devices in the presented cluster is such that the corresponding calibrated common power sensors are used as standard meters, and the calibration processes of the power sensors in each adjacent charging pile are passed on.

[0157] Embodiment 5:

[0158] An embodiment of the present invention provides a method for self-checking the error of an electric energy metering device. Based on the electric energy metering device for self-checking the error of a charging pile in Embodiment 3, a charging line of a charging pile is selected as the self-checking line, and the electric energy metering device on the self-checking line of the charging pile and the common power sensors in the electric energy metering devices of adjacent charging piles are calibrated by externally connecting a standard electric energy sensor. Using the calibrated common power sensors in the electric energy metering devices of adjacent charging piles as a link, the self-checking of each electric energy metering device in the charging pile cluster is realized in a recursive manner.

[0159] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An electric energy metering device for self-checking the error of a charging pile, characterized in that, Including: The local power sensor and the public power sensor; One side of the local power sensor is connected in series with one side of the public power sensor through a wire, and is used to monitor the power of the charging pile where the local power sensor is located; The other side of the public power sensor is provided with a first port and a second port in parallel. The first port is used for connecting in series with an AC-DC converter, and the second port is used for connecting in series with the output end of the second local power sensor in the adjacent second power metering device; A third port is also led out between the connection port of the public power sensor and the local power sensor, and is used for connecting with the charging gun of this pile; The other side of the local power sensor is provided with a fourth port, which is used for connecting with the second port in the adjacent third power metering device; Among them, the error calibration of one of the power metering devices and the public power sensor in the adjacent power metering device connected to its fourth port is realized by connecting an external standard power sensor between each power metering device. Then, taking the public power sensor of the calibrated power metering device as a link, the error detection of the public power sensor and the local power sensor in the adjacent power metering device is obtained and calibrated, so as to recursively realize the error detection of each charging metering device.

2. The electric energy metering device for error self-check of a charging pile according to claim 1, wherein, In the charging pile system architecture, the error calibration of one of the power metering devices and the public power sensor in the adjacent power metering device connected to its fourth port by connecting an external standard power sensor between each power metering device specifically includes: Select the first charging pile. The power metering function in the first charging pile is completed by the power metering device. A standard power sensor is connected in series on the self-circuit of the corresponding metering device to form a self-check error line of the first charging pile; When the charging pile where the adjacent charging metering device of the power metering device of the first charging pile exits the charging operation, the charging gun is in a vacant state, the switch between the power metering device and the AC-DC converter of the charging pile is in an open state, and the charging gun of the first charging pile and the switch between the power metering device and the AC-DC converter of the first charging pile are closed, so as to complete the error calibration of the power metering device of the first charging pile and the public power sensor in the adjacent power metering device on the self-check error line of the first charging pile.

3. The electric energy metering device for error self-check of a charging pile according to claim 2, characterized in that The specific description of "then taking the public power sensor of the calibrated power metering device as a link" is as follows: In addition to including the local power sensor and the public power sensor in the power metering device on the self-check line of the charging pile after installing the power metering device, the public power sensor of the power metering device of the adjacent charging pile is also included; After calibrating the power sensors on its self-check line, the public power sensor of the power metering device of the adjacent charging pile can be used as a standard power sensor to calibrate the power sensors on the self-check line of the adjacent charging pile. Taking the public power sensor of the adjacent charging pile as a link, the self-check of the power metering devices of the charging pile cluster is realized.

4. The electric energy metering device for error self-check of a charging pile according to claim 2, wherein, The specific description of "so as to recursively realize the error detection of each charging metering device" includes: After completing the error detection and calibration of one of the electric energy metering devices, select the self-checking circuit of the charging pile that includes adjacent metering devices for connection. And keep the self-checking circuits of other charging piles in a disconnected state. Use the common electric energy sensor of the calibrated adjacent metering devices as the standard electric energy sensor to achieve the error self-check of the adjacent circuit metering devices. Sequentially detect one by one from the electric energy metering devices of the charging piles connected with the self-checking circuit of the standard electric energy sensor to both sides until the error self-check of the electric energy metering devices of each charging pile in the charging pile cluster is completed.

5. The electric energy metering device for error self-check of a charging pile according to claim 2, characterized in that, The error self-check system of the charging pile electric energy metering device further includes an electric energy data collector and a calculation system. Among them, the electric energy data collector is used to collect the metering values of the local electric energy sensors, common electric energy sensors, and standard electric energy sensors of the electric energy metering devices of each charging pile and transmit them to the calculation system. The calculation system is used to complete the calculation of the metering errors of the local electric energy sensors and common electric energy sensors of the electric energy metering devices of each charging pile.

6. The electric energy metering device for error self-check of a charging pile according to any one of claims 1-5, characterized in that, The charging pile cluster circuit further includes: There is a toggle switch or a wireless transmitter in the charging gun of each charging pile. Among them, the toggle switch is used to be in a closed state when the charging gun is working, so as to trigger the switch located between the electric energy metering device and the AC-DC converter of the charging pile to be in a closed state; it is also used to be in an open state when the charging gun is idle, so as to trigger the switch located between the electric energy metering device and the AC-DC converter of the charging pile to be in an open state. Among them, the wireless transmitter is used to send a first wireless signal when the charging gun is working, so as to trigger the switch located between the energy metering device and the AC-DC converter of the charging pile to be in a closed state; it is also used to send a second wireless signal when the charging gun is idle, so as to trigger the switch located between the electric energy metering device and the AC-DC converter of the charging pile to be in an open state.

7. The electric energy metering device for error self-check of a charging pile according to any one of claims 1-5, characterized in that When performing the error detection of the electric energy metering device of each charging pile, it is necessary to switch the charging state to the error self-check state. Specifically: the corresponding charging state and error self-check state are the states when switching to the corresponding circuit. At this time, there is no connected contact between the electric energy metering device and the power supply circuit of each charging pile, showing an electrically isolated state; and it shows that the electric energy metering devices of each charging pile in the corresponding connection relationship are sequentially connected to the corresponding ports by the detection wires.

8. The electric energy metering device for error self-check of a charging pile according to any one of claims 1-5, characterized in that, The two electrodes of the standard electric energy sensor are set as pluggable plugs, and the pluggable plugs are matched with the charging gun.

9. The electric energy metering device for error self-check of a charging pile according to any one of claims 1-5, characterized in that The electric energy sensors in the charging pile electric energy metering device and the standard electric energy sensors for detection are both composed of an electric energy metering sensor and a standard electric energy meter. The metering error is composed of the electric energy metering sensor error and the standard electric energy metering device error for detection.

10. A method for self-checking the error of an electric energy metering device, characterized in that, Using the electric energy metering device for error self-check of charging piles according to any one of claims 1-9, select the charging line of a charging pile as the self-check line, and calibrate the electric energy metering device on the self-check line of this charging pile and the common electric energy sensor in the electric energy metering device of the adjacent charging pile by externally connecting a standard electric energy sensor. Using the common electric energy sensor in the calibrated electric energy metering device of the adjacent charging pile as a link, realize the self-check of each electric energy metering device in the charging pile cluster in a recursive manner.

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