Charging device and method for error verification of charging pile cluster

Abstract

The invention discloses a charging device and method for error verification of a charging pile cluster. The device comprises an AC / DC power supply, a charging gun, a charging switch, a pile electric energy sensor and a standard electric energy sensor. The AC / DC power supply, the charging switch, the pile electric energy sensor, the standard electric energy sensor and the charging gun are sequentially connected through wires to form a self-checking circuit of the charging device; a lead is led out from each of joints at two ends of the charging gun to serve as a first port and a second port, the first port is connected in series with a first charging pile at the head part of the charging pile cluster, and the second port is connected in series with a second charging pile at the tail part of the charging pile cluster. And obtaining a charging error verification line of the charging pile cluster. Through the standard electric energy sensor and switching of the corresponding switches, error verification of the electric energy sensor of each charging pile of the charging pile cluster is realized, and the error verification efficiency of the charging pile cluster is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric energy error detection, and particularly to a charging device and method for error verification of a charging pile cluster. Background Art

[0002] With the development of society, people pay more and more attention to environmental protection. As a result, clean energy is increasingly favored by society, and electric vehicles are being manufactured and used all over the world. As time goes by, the world pays more attention to environmental protection, and 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 as the new mainstream means of transportation.

[0003] An electric vehicle charging pile is a measuring instrument for charging electric energy transactions. 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, the existing technology adopts a method of detecting and verifying the error of one charging pile at a time for connected electric vehicle charging piles. This method not only takes a long time and cannot meet the market demand for quickly verifying the charging pile cluster, but also in the traditional detection process, adding a standard electric energy meter or other metering components to the charging line of each charging pile for error detection or calibration of each charging pile 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 existing technology 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 to urgently need a solution to quickly verify or calibrate the error of the charging pile cluster on the premise of saving costs as much as possible, so as to solve the market problems of improving the error detection efficiency of the charging pile cluster and reducing the detection cost.

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

[0007] In a first aspect, the present invention provides a charging device for error verification of a charging pile cluster, including: an AC / DC power supply, a charging gun, a charging switch, a local pile electric energy sensor, and a standard electric energy sensor;

[0008] The AC / DC power supply is used to supply power to the charging pile;

[0009] The local pile electric energy sensor is used to monitor the electric energy of the charging pile;

[0010] The standard electric energy sensor is used to calibrate the local pile electric energy sensors of the respective charging piles in the charging pile cluster;

[0011] The charging gun is used to provide an interface for load charging;

[0012] Connect the AC / DC power supply, the charging switch, the on-board power sensor of this pile, the standard power sensor, and the charging gun in sequence through wires to form a self-checking circuit of the charging device;

[0013] Connect the on-board power sensors of each charging pile in the charging pile cluster through layout detection wires to form a series connection relationship under the electrical characteristics of the detection wires. Among them, one end of the on-board power sensor of the first charging pile located at the head of the series connection relationship close to the AC / DC converter is led out through a wire as the first input end of the series connection relationship, and the other end of the on-board power sensor of the second charging pile located at the end close to the charging gun is used as the second input end of the series connection relationship;

[0014] Connect the charging device to the positive and negative poles at both ends of the charging gun, and lead out a wire from each as the first port and the second port. Connect the first port to the first input end, and connect the second port to the second input end. By adjusting the on-off of the charging device and the switches of each charging pile in the charging pile cluster, the charging error verification circuit of the charging pile cluster is obtained.

[0015] Preferably, the step of connecting the on-board power sensors of each charging pile in the charging pile cluster through layout detection wires to form a series connection relationship under the electrical characteristics of the detection wires is specifically as follows:

[0016] Successively establish the series connection relationship between the on-board power sensors of each charging pile in the charging pile cluster in such a way that one end of the on-board power sensor of the subsequent charging pile close to the AC / DC converter is connected to the other end of the on-board power sensor of the previous charging pile close to the charging gun.

[0017] Preferably, it further includes a first switch and a second switch. Both ends of the first switch are connected in parallel to the self-checking circuit of the charging device through wires to protect the standard power sensor; the second switch is arranged on the wire connecting the second port and the second connection point to control the on-off of the charging error verification circuit of the charging pile cluster.

[0018] Preferably, by adjusting the on-off of the first switch, the second switch, the charging switch of the charging device, the switch between the AC / DC converters in the charging pile cluster, and the switches of each charging gun, the charging error verification circuit of the charging pile cluster is obtained. Specifically:

[0019] When the charging device and each charging pile in the charging pile cluster exit the charging operation, the charging gun is in an idle state, and the switch between the AC / DC converters of each charging pile is in an off state, and the charging switch of the charging device is in a closed state. The first switch is off and the second switch is on, so that the charging device is switched from the original self-checking circuit to a new charging pile cluster error verification circuit, and the charging error verification circuit of the charging pile cluster is obtained.

[0020] Preferably, it further includes an electric energy data collector and a computing system;

[0021] Wherein, the electric energy data collector is used to collect the metering values of the on-pile electric energy sensors of each charging pile including the charging device and the standard electric energy sensors, and transmit them to the computing system;

[0022] The computing system is used to calculate the metering errors of the on-pile electric energy sensors and the common electric energy sensors of each charging pile and the charging device.

[0023] Preferably, the charging error verification circuit of the charging pile cluster further includes:

[0024] A toggle switch or a wireless transmitter is provided in the charging gun of each charging pile;

[0025] Wherein, the toggle switch is in a closed state when the charging gun is working, so as to trigger the switch between the electric energy metering device and the AC / DC converter of the charging pile to be in a closed state; it is also in an open state when the charging gun is idle, so as to trigger the switch between the electric energy metering device and the AC / DC converter of the charging pile to be in an open state;

[0026] Wherein, the wireless transmitter is used to send a first wireless signal when the charging gun is working, so as to trigger the switch 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 between the electric energy metering device and the AC / DC converter of the charging pile to be in an open state.

[0027] Preferably, the on-pile electric energy sensor 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 metering error is composed of the error of the on-pile electric energy metering sensor and the error of the standard electric energy metering device for detection.

[0028] Preferably, the charging device is permanently fixed to be connected to the charging pile cluster, or, before the charging pile error detection, the charging device is temporarily connected to the charging pile cluster.

[0029] Preferably, the on-pile electric energy sensor of each charging pile is switched from the original electrical connection of the charging pile to the charging error verification circuit of the charging pile cluster, specifically:

[0030] The on-pile electric energy sensors of each charging pile have no connected contacts with the power supply circuit of each charging pile and are in an electrically isolated state; while the on-pile electric energy sensors of each charging pile on the charging error verification circuit of the charging pile cluster are sequentially connected in series by detection wires to form the error verification circuit of the charging pile cluster.

[0031] In a second aspect, the present invention also provides a method for calibrating the error of a charging pile cluster. Based on the charging device for calibrating the error of a charging pile cluster in the first aspect, the first port of the charging device is connected in series with the first charging pile at the head of the charging pile cluster, and the second port is connected in series with the second charging pile at the tail of the charging pile cluster to form a charging error calibration circuit for the series-connected charging pile cluster. By comparing the measurement results of the on-site power sensor of each charging pile (including the charging device) with those of the standard power sensor, the measurement error of the on-site power sensor within the charging pile cluster can be obtained.

[0032] Connect the charging device of the present invention to the charging pile cluster to form an on-site power sensor error calibration circuit for the charging pile cluster. By switching each set switch to the corresponding position, the charging state of each charging pile is switched to the error calibration circuit of the charging pile cluster, thereby realizing the error calibration and calibration of the charging pile cluster. Compared with the traditional method, the present invention does not require calibrating each charging pile one by one, nor does it need to install corresponding standard power sensors on the charging lines of each charging pile for calibration. Only by installing the charging device of the present invention within the charging pile cluster, the errors of the power sensors of each charging pile in the charging pile cluster can be calibrated, and the errors of the charging pile cluster can be calibrated on a large scale, improving the efficiency of calibrating the errors of the charging pile cluster. Description of the Drawings

[0033] 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, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic diagram of a charging device for calibrating the error of a charging pile cluster provided by an embodiment of the present invention;

[0035] Figure 2 It is a flowchart of the connection process between a charging device for calibrating the error of a charging pile cluster and the charging pile cluster provided by an embodiment of the present invention;

[0036] Figure 3 It is a schematic diagram of a charging device for calibrating the error of a charging pile cluster being connected to the charging pile cluster provided by an embodiment of the present invention;

[0037] Figure 4 It is a schematic diagram of the structural principle of a toggle switch provided by an embodiment of the present invention;

[0038] Figure 5 It is an equivalent circuit diagram of a charging error calibration circuit for a charging pile cluster provided by an embodiment of the present invention. Detailed implementation mode

[0039] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, 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.

[0040] 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. It is only for the convenience of describing the present invention and does not require the present invention to be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0041] 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.

[0042] Embodiment 1:

[0043] Embodiment 1 of the present invention provides a charging device for charging pile cluster error verification, as Figure 1 shown, including: an AC / DC power supply, a charging gun, a charging switch, a local pile power sensor, and a standard power sensor;

[0044] The AC / DC power supply is used to supply power to the charging pile;

[0045] The local pile power sensor is used to monitor the power of the charging pile;

[0046] The standard power sensor is used to calibrate the local pile power sensors of the respective charging piles in the charging pile cluster;

[0047] The charging gun is used to provide an interface for load charging;

[0048] The AC / DC power supply, the charging switch, the local pile power sensor, the standard power sensor, and the charging gun are sequentially connected by wires to form a self-checking circuit of the charging device;

[0049] The local pile power sensors in each charging pile in the charging pile cluster are connected by layout detection wires to form a series connection relationship under the electrical characteristics of the detection wires. Among them, one end of the first charging pile local pile power sensor located at the head of the series connection relationship close to the AC / DC converter is led out by a wire as the first input end of the series connection relationship, and the other end of the second charging pile local pile power sensor located at the end close to the charging gun is used as the second input end of the series connection relationship;

[0050] Connect the charging device, and lead a wire from each of the positive and negative electrodes at both ends of the charging gun as the first port and the second port. Connect the first port to the first input end and the second port to the second input end. By adjusting the on / off states of the switches of the charging device and each charging pile in the charging pile cluster, obtain the charging error verification circuit of the charging pile cluster.

[0051] The charging device of the present invention is actually a charging pile connected in series with a standard power sensor. To distinguish the present invention from each charging pile, the present invention is called a charging device. Connect the respective local power sensors of each charging pile in the charging pile cluster in series through wires (before being connected in series, each charging pile in the charging pile cluster is isolated from each other, and each charging pile only has its own charging circuit, and there is no wire connection between the charging circuits of the charging piles). Then, connect the first port and the second port of the charging device of the present invention to the charging piles at the first and last positions in the charging pile cluster respectively, forming an error verification circuit for the local power sensors of each charging pile in the charging pile cluster. By switching each set switch to the corresponding position, switch the charging states of each charging pile to the error verification circuit of the charging pile cluster, and realize the error verification and calibration of the local power sensors of each charging pile in the charging pile cluster through the standard power sensor in the charging device. Compared with the traditional method, the present invention only needs to install the charging device of the present invention in the charging pile cluster to realize the verification and calibration of the errors of each charging pile in the charging pile cluster, scale the verification of the errors of each charging pile in the charging pile cluster, and improve the efficiency of charging pile cluster error verification.

[0052] Next, further elaborate on the details of the present invention. The local power sensors in each charging pile in the charging pile cluster are connected through the layout of detection wires to form a series connection relationship under the electrical characteristics of the detection wires, as Figure 2 shown, which represents the circuit diagram of the charging pile cluster that forms an interconnected relationship between each charging pile using wires. To be consistent with the numbers of each charging pile in the charging circuit diagram formed by connecting the charging device of the embodiment of the present invention to the charging pile cluster later, set the number of the first charging pile at the first position in the series connection relationship to No. 2. The figure shows multiple charging piles, and only 5 charging piles are drawn due to drawing limitations. And the second charging pile always represents the charging pile at the very end of the charging pile cluster, specifically:

[0053] Successively establish the series connection relationship between the local power sensors of each charging pile in the charging pile cluster in such a way that one end of the local power sensor of the subsequent charging pile close to the AC / DC converter is connected to the other end of the local power sensor of the previous charging pile close to the charging gun.

[0054] In order to achieve the switching between the charging state and the verification state of the charging pile cluster, a first switch and a second switch are further included on the verification circuit of the corresponding charging device. Both ends of the first switch are connected in parallel with a standard power sensor through wires and are connected into the self-checking circuit of the charging device to protect the standard power sensor. The second switch is arranged on the wire connecting the second port and the second connection point and is used to control the on-off of the charging error verification circuit of the charging pile cluster.

[0055] Among them, through the first port and the second port set by the charging device of the present invention, they are connected to the first input port set on the charging circuit of the first charging pile at the head of the charging pile cluster and the second input port set on the charging circuit of the second charging pile at the end of the charging pile cluster respectively, forming a self-checking circuit for the charging error of the charging pile cluster. Through the adjustment of the corresponding switch, the switching between the charging state and the verification state of the charging pile cluster is realized. It should be noted that the connection relationship between the first port and the second port set by the charging gun of the charging device and the corresponding first input end and second input end can be understood as that one pole (positive or negative) of the charging gun is connected to the first input end, and the other pole (negative or positive) is connected to the other input end. For example: the two ports set by the charging gun of the charging device are respectively called port A and port B, and the two input ends of the corresponding charging pile cluster are respectively end a and end b. At this time, it can be that port A is connected to end a and port B is connected to end b, or port A is connected to end b and port B is connected to end a. The corresponding numbers first and second in the embodiments of the present invention (for example, the first port, the second port) are only numbers set to distinguish the same structure or device and have no substantial difference.

[0056] As Figure 3 shown, a first switch is connected in parallel with the standard power sensor on the verification circuit of the charging pile cluster of the present invention. When the charging device charges the vehicle, the first switch is closed, and the standard power sensor is not connected to the circuit (is short-circuited), playing a role in protecting the standard power sensor (preventing the self-error of the standard power sensor from becoming larger during use and causing inaccurate self-measurement). The second switch mainly plays a role in controlling the on-off of the charging error verification circuit of the charging pile cluster. As Figure 3 shown in the charging circuit diagram, when the charging device and each charging pile of the charging pile cluster exit the charging operation, the charging gun is in the vacant state, and moreover, when the switch between the AC-DC converters of each charging pile is in the off state and the charging switch of the charging device is in the on state, the first switch is turned off and the second switch is turned on, so that the charging device is switched from the original self-checking circuit to a new charging error verification circuit of the charging pile cluster, and the charging error verification circuit of the charging pile cluster is obtained.

[0057] After the above content is expanded, the core part of the function and usage method of the charging device for error verification of the charging pile cluster of the present invention has been presented. For detection, the charging device of the present invention also includes an electric energy data collector and a calculation system;

[0058] Among them, the electric energy data collector is used to collect the measured values of the on-pile electric energy sensors of each charging pile including the charging device and the standard electric energy sensor, and transmit them to the calculation system;

[0059] The calculation system is used to calculate the measurement errors of the on-pile electric energy sensors of each charging pile and the charging device and the common electric energy sensors. 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.

[0060] In the embodiment of the present invention, the load for verification is provided by the AC-DC power supply in the electric energy device. In order to enable the on-pile electric energy sensors of each charging pile to freely switch from the original electrical connection of the charging pile to the charging error verification line of the charging pile cluster, wires are required to connect the corresponding devices. Specifically: the on-pile electric energy sensors of each charging pile have no connected contacts with the power supply circuit of each charging pile and are in an electrically isolated state; and the on-pile electric energy sensors of each charging pile on the charging error verification line of the charging pile cluster are sequentially connected in series by detection wires to form the error verification line of the charging pile cluster.

[0061] Such as Figure 3 shown, for the charging device of the embodiment of the present invention, as well as each charging pile in the charging pile cluster, a switch is provided between the AC-DC converter and the on-pile electric energy sensor. Therefore, the charging error verification line of the charging pile cluster further includes:

[0062] A toggle switch or a wireless transmitter is provided in the charging gun of each charging pile;

[0063] 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 between the on-pile electric energy sensor of the charging pile 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 between the on-pile electric energy sensor of the charging pile and the AC-DC converter of the charging pile to be in an open state; as Figure 4 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 inserted into the charging port on the vehicle, the charging male port on the vehicle pushes open the toggle switch provided on the side wall of the charging female port of the charging gun, so that Figure 4The 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 loop is formed in the corresponding weak current, and an electromagnetic adsorption force is provided to the electromagnetic switch, thus completing as Figure 4 shown in the closing of the electromagnetic switch, so as to ensure that after having the improved structure as Figure 4 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 supply circuit of the charging pile. Otherwise, the electric energy sensor of this pile 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 verification line connected in series with the standard electric energy sensor, the error verification and calibration of this charging pile cluster are realized.

[0064] 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 between the electric energy sensor of this pile located in the charging pile 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 between the electric energy sensor of this pile located in the charging pile and the AC / DC converter of the charging pile to be in an open state. Compared with Figure 4 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 electric energy sensor of this pile as Figure 3 shown and the AC / DC converter of the charging pile needs to be in an open state. In this way, 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, in the implementation process of the embodiment of the present invention, it is utilized that the charging interface of the charged load (such as an electric vehicle) will also release current after being connected with 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, and the first wireless signal is sent, thus completing Figure 3 shown in the closing of the switch on the side of the AC / DC converter, so that the charging gun is connected to the AC / DC converter, and then enters the normal charging state.

[0065] In the embodiment of the present invention, the electric energy sensor of this pile 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. The metering error is composed of the error of the electric energy metering sensor of this pile and the error of the standard electric energy metering device for detection.

[0066] In addition, the charging device according to the embodiment of the present invention needs to be connected to the charging pile cluster. The corresponding connection method can be to permanently fix the charging device to the charging pile cluster, or to temporarily connect the charging device to the charging pile cluster before the charging pile error detection.

[0067] For the permanent method, its impact on the accuracy of the final measurement error calculation is smaller; for the temporary method, even if the charging device is connected to the charging pile cluster by means of a plug-and-play connection at the connection between the corresponding interface and the corresponding port to complete the series connection of the charging pile cluster error verification line, it will also bring problems of impedance consistency, thus bringing unnecessary noise interference to the final calculation result. Therefore, the permanent method recommended by the present invention is the above-mentioned permanent method.

[0068] Embodiment 2:

[0069] The embodiment of the present invention provides a method for verifying the error of a charging pile cluster. Based on the charging device for verifying the error of a charging pile cluster in Embodiment 1, the first port of the charging device is connected in series with the first charging pile at the head of the charging pile cluster, and the second port is connected in series with the second charging pile at the tail of the charging pile cluster to form a charging error verification line for the series-connected charging pile cluster. By comparing the measurement results of the on-pile power sensors of each charging pile including the charging device with the measurement results of the standard power sensors, the measurement error of the on-pile power sensors in the charging pile cluster can be obtained.

[0070] As Figure 5 shown, it represents the equivalent circuit diagram of the charging device according to the embodiment of the present invention. When the power switch and the second switch are closed, the first switch is opened, and the charging gun of the charging device is disconnected, and the charging lines of each charging pile in the charging pile cluster are disconnected, the circuit will switch to the verification line of the corresponding charging pile cluster. At this time, the components of the verification line of the charging pile cluster are in a series connection relationship. The error verification of the on-pile power sensors of each charging pile in the charging pile cluster is completed through the standard power sensor in the series connection relationship, thus realizing the high-efficiency verification of the error of the charging pile cluster on a large scale.

[0071] 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 in the protection scope of the present invention.

Claims

1. A charging device for error verification of a charging pile cluster, characterized in that, Including: AC / DC power supply, charging gun, charging switch, on-site power sensor and standard power sensor; The AC / DC power supply is used to supply power to the charging pile; The on-site power sensor is used to monitor the power of the charging pile; The standard power sensor is used to calibrate the on-site power sensors of the respective charging piles in the charging pile cluster; The charging gun is used to provide an interface for load charging; The AC / DC power supply, charging switch, on-site power sensor, standard power sensor and charging gun are connected in sequence through wires to form a self-checking circuit of the charging device; The on-site power sensors in each charging pile in the charging pile cluster are connected by layout detection wires to form a series connection relationship under the electrical characteristics of the detection wires. Among them, one end of the first charging pile on-site power sensor located at the head of the series connection relationship close to the AC / DC converter is led out through a wire as the first input end of the series connection relationship, and the other end of the second charging pile on-site power sensor located at the end close to the charging gun is used as the second input end of the series connection relationship; A wire is led out from each of the positive and negative poles at both ends of the charging gun of the charging device as the first port and the second port. The first port is connected to the first input end, and the second port is connected to the second input end. By adjusting the on-off of the charging device and the switches of each charging pile in the charging pile cluster, a charging error verification circuit of the charging pile cluster is obtained.

2. The charging device for charging pile cluster error verification according to claim 1, wherein, The connection of the on-site power sensors in each charging pile in the charging pile cluster by layout detection wires to form a series connection relationship under the electrical characteristics of the detection wires is specifically: The series connection relationship between the on-site power sensors of each charging pile in the charging pile cluster is established in the way that one end of the on-site power sensor of the latter charging pile close to the AC / DC converter is connected to the other end of the on-site power sensor of the previous charging pile close to the charging gun in sequence.

3. The charging device for error verification of a charging pile cluster according to claim 1, characterized in that, It also includes a first switch and a second switch. Both ends of the first switch are connected in parallel to the standard power sensor through wires and are connected into the self-checking circuit of the charging device to protect the standard power sensor; the second switch is arranged on the wire connecting the second port and the second connection point and is used to control the on-off of the charging error verification circuit of the charging pile cluster.

4. The charging device for charging pile cluster error verification according to claim 3, characterized in that, By adjusting the on-off of the first switch, second switch and charging switch of the charging device, the switch between the AC / DC converters of each charging pile in the charging pile cluster and the switches of each charging gun, a charging error verification circuit of the charging pile cluster is obtained. Specifically: When the charging device and each charging pile in the charging pile cluster exit the charging operation, the charging gun is in an idle state, and the switch between the AC / DC converters of each charging pile is in an off state. When the charging switch of the charging device is in a closed state, the first switch is off and the second switch is on, so that the charging device is switched from the original self-checking circuit to a new charging pile cluster error verification circuit, and a charging error verification circuit of the charging pile cluster is obtained.

5. The charging device for charging pile cluster error verification according to claim 1, characterized in that It also includes a power data collector and a calculation system; Among them, the power data collector is used to collect the measurement values of the on-site power sensors of each charging pile including the charging device and the standard power sensor, and transmit them to the calculation system; The computing system is used to calculate the measurement errors of the on-site power sensors and the common power sensors of each charging pile and charging device.

6. The charging device for charging pile cluster error verification according to any one of claims 1-5, characterized in that The charging error verification circuit of the charging pile cluster further includes: A toggle switch or a wireless transmitter is provided 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 between the on-site power sensor of the charging pile 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 between the on-site power sensor of the charging pile 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 between the on-site power sensor of the charging pile 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 between the on-site power sensor of the charging pile and the AC / DC converter of the charging pile to be in an open state.

7. The charging device for charging pile cluster error verification according to any one of claims 1-5, characterized in that The on-site power sensor of the charging pile and the standard power sensor for detection are both composed of an electric energy measurement sensor and a standard electric energy meter, and the measurement error is composed of the error of the on-site electric energy measurement sensor and the error of the standard electric energy measurement device for detection.

8. The charging device for charging pile cluster error verification according to any one of claims 1-5, characterized in that, The charging device is connected to the charging pile cluster permanently, or, before the charging pile error detection, the charging device is temporarily connected to the charging pile cluster.

9. The charging device for charging pile cluster error verification according to any one of claims 1-5, characterized in that, The on-site power sensor of each charging pile is switched from the original electrical connection of the charging pile to the charging error verification circuit of the charging pile cluster, specifically: The on-site power sensor of each charging pile has no connected contact with the power supply circuit of each charging pile and is in an electrically isolated state; and the on-site power sensors of each charging pile on the charging error verification circuit of the charging pile cluster are sequentially connected in series by detection wires to form an error verification circuit of the charging pile cluster.

10. A method for error verification of a charging pile cluster, characterized in that, Using the charging device for charging pile cluster error verification according to any one of claims 1-9, the first port of the charging device is connected in series with the first charging pile at the head of the charging pile cluster, and the second port is connected in series with the second charging pile at the tail of the charging pile cluster to form a charging error verification circuit of the series-connected charging pile cluster. By comparing the measurement results of the on-site power sensors of each charging pile including the charging device with the standard power sensor, the measurement error of the on-site power sensors in the charging pile cluster can be obtained.

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