Construction method and detection method capable of switching charging circuit to error detection circuit

Abstract

The invention relates to the technical field of charging pile metering, and provides a construction method capable of switching a charging circuit to an error detection circuit and a detection method. The construction method comprises the following steps of: connecting the metering modules in the charging piles in the charging pile cluster into a serial connection relationship under the electrical characteristics of the detection wires by arranging the detection wires; and when each charging pile quits the charging operation, the charging gun is in a vacant state, and the switch between the metering module and the AC / DC converter of the charging pile is in an off state, so that the metering module of each charging pile is switched from the original electrical connection of the charging pile to the series connection relationship. According to the invention, the electric energy metering error of the charging pile cluster can be detected on a large scale, a corresponding construction method of the detection circuit is provided, 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 charging pile metering, and particularly to a construction method and a detection method capable of switching a charging line to an error detection line.

Background Art

[0002] At present, there are two types of detection methods for the electrical energy metering error of a charging pile cluster. One is to use a dedicated charging pile metering error detection device to detect one charging pile at a time for the primary error detection. This technology takes a long time and has a high cost, and cannot meet the market demand for the error verification of the charging pile cluster. The other is to study adding intelligent devices, standard electric energy meters, and / or other metering components to the charging piles. Such methods will increase the cost of charging pile error detection and affect the reliability of the safe operation of the charging piles.

[0003] 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

[0004] The technical problem to be solved by the present invention is to urgently need a solution and a construction of a detection line that can scale the detection of the electrical energy metering error of a charging pile cluster, so as to solve the market pain points of improving the charging pile error detection efficiency and reducing the detection cost.

[0005] The present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a construction method capable of switching a charging line to an error detection line. A metering module for charging metering is connected in series on the respective neutral lines of each charging pile. The construction method includes:

[0007] Connect the metering modules in each charging pile in the charging pile cluster into a series connection relationship under the electrical characteristics of the detection wire by arranging the detection wire;

[0008] When each charging pile exits the charging operation, the charging gun is in an empty state, and moreover, the switch located between the metering module and the AC / DC converter of the charging pile is in an open state, so that the metering module of each charging pile is switched from its original electrical connection of the charging pile to the series connection relationship, and a charging pile cluster electrical energy metering error detection line is obtained.

[0009] Preferably, for the metering module of each charging pile, the end closer to the AC / DC converter is described as the first port, and the other end closer to the charging gun is described as the second port. Then, the connecting the metering modules in each charging pile in the charging pile cluster into a series connection relationship under the electrical characteristics of the detection wire specifically includes:

[0010] Lead out the first port of the metering module of the first charging pile at the head of the cascading relationship through a wire as one input end of the cascading relationship; successively establish the cascading relationship between the metering modules of each charging pile in the charging pile cluster in the way that the second port of the metering module of the previous charging pile is connected to the first port of the metering module of the next charging pile; wherein, the second port of the metering module of the charging pile at the end is used as the other input end of the cascading relationship.

[0011] Preferably, the construction method further includes:

[0012] Connect both ends of the power metering error detection circuit of the charging pile cluster to a power metering error detection system composed of a detection power supply, a detection load, and a standard power metering device respectively;

[0013] Obtain the metering error of each metering module by comparing the metering result of the standard power metering device with the metering result of the metering module in each charging pile.

[0014] Preferably, the power metering error detection system further includes a power data collector and a calculation system;

[0015] Wherein, the power data collector is used to collect the metering values of the metering modules in each charging pile and the standard power metering device, and transmit them to the calculation system;

[0016] The calculation system is used to complete the calculation of the metering error of each metering module.

[0017] Preferably, the detection load includes an actual load using the power battery of an electric vehicle as the detection load, a specially designed equivalent load, or a virtual load simulated by independent current sources and voltage sources respectively.

[0018] Preferably, the construction method further includes:

[0019] A toggle switch or a wireless transmitter is provided in the charging gun of each charging pile;

[0020] Wherein, 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 metering module and the AC / DC converter of the charging pile to be in a closed state; and is also used to be in an open state when the charging gun is idle, so as to trigger the switch between the metering module and the AC / DC converter of the charging pile to be in an open state;

[0021] 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 metering module and the AC / DC converter of the charging pile to be in a closed state; and is also used to send a second wireless signal when the charging gun is idle, so as to trigger the switch between the metering module and the AC / DC converter of the charging pile to be in an open state.

[0022] Preferably, the serial connection relationship is permanently fixed and maintained, or the serial connection relationship is temporarily established before the error detection of the charging pile.

[0023] Preferably, the metering module of each charging pile is switched from its original electrical connection of the charging pile to the serial connection relationship. Specifically:

[0024] The metering module in the serial connection relationship has no connected contacts with the power circuits of each charging pile and is in an electrically isolated state; and it shows the characteristic that the metering modules of each charging pile in the serial connection relationship are sequentially connected in series by the detection wires; wherein, the power circuit includes the AC-DC converter and the load to be charged.

[0025] Preferably, the metering module of the charging pile and the standard electrical energy metering device for detection are both composed of a metering sensor and a standard electrical energy meter, and the metering error is composed of the error of the metering sensor and the error of the standard electrical energy metering device for detection.

[0026] In a second aspect, the present invention provides a detection method for detecting the metering error of a charging pile cluster. By using the construction method described in the first aspect that can switch the charging line to the error detection line, a serial connection relationship composed of metering modules in each charging pile is constructed, and the serial connection relationship is connected to an electrical energy metering error detection system composed of a detection power supply, a detection load, and a standard electrical energy metering device. By comparing the metering results of the standard electrical energy metering device and the metering results of the metering modules in each charging pile, the metering error of each metering module can be obtained.

[0027] The present invention can detect the electrical energy metering error of a charging pile cluster on a large scale, provides a construction method for the corresponding detection line, improves the efficiency of charging pile error detection, and reduces the detection cost.

Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly introduced below. Obviously, the following described drawings 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.

[0029] Figure 1 It is a flowchart of a construction method for switching a charging line to an error detection line provided by an embodiment of the present invention;

[0030] Figure 2 It is a schematic diagram of the architecture of a charging pile cluster in the prior art provided by an embodiment of the present invention;

[0031] Figure 3 It is a schematic structural diagram of a metering error detection for a charging pile cluster provided by an embodiment of the present invention;

[0032] Figure 4 It is a schematic structural diagram of a metering error detection for a charging pile cluster provided by an embodiment of the present invention, cooperating with the architecture of an electric energy metering error detection system;

[0033] Figure 5 It is an equivalent circuit diagram of a metering error detection for a charging pile cluster provided by an embodiment of the present invention;

[0034] Figure 6 It is a schematic structural principle diagram of a toggle switch provided by an embodiment of the present invention.

Specific Embodiments

[0035] 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.

[0036] In the description of the present invention, the orientation or positional relationship indicated by terms such as "inner", "outer", "longitudinal", "transverse", "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 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.

[0037] 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.

[0038] Example 1:

[0039] The core idea of the embodiment of the present invention is to adjust each charging pile in the charging station. First, ensure that the metering modules of the charging piles are all set to the negative pole. In this way, even during the charging process of the charging pile, the metering module on the charging pile can be switched from the charging line to the error detection circuit by disconnecting the switch set on the negative pole transmission power wire.

[0040] To achieve the foregoing objectives, on the basis of ensuring that the corresponding metering module is set at the negative electrode, the embodiments of the present invention also set the switch proposed by the present invention between the connection wires of the metering module and the input power supply of each charging pile. The biggest technical feature of the embodiments of the present invention is that for adjacent charging piles, an electrical connection wire is led out from the connection wire between the metering module and the charging gun of one side of the charging pile and connected to the connection wire between the metering module and the new switch of the adjacent side of the charging pile. In this way, by adding connection wires between adjacent charging piles, a series relationship of the respective metering modules in the entire charging station is established under specific conditions.

[0041] In the above-mentioned specific state, when the switches are all in the off state, the power metering devices of each charging pile in the entire charging station form a detection circuit in a series relationship. Therefore, as long as a standard power metering device is connected in series between the head and the tail of the corresponding series relationship, the metering calculation of the metering modules on each charging pile can be completed by comparing with the metering data collected by the metering modules on each charging pile. According to the solution of the embodiments of the present invention, by adding as few components and device objects as possible, the metering errors of each charging pile in the existing charging station can be efficiently detected. For specific introductions, please refer to the following description.

[0042] Embodiment 1 of the present invention provides a construction method for switching a charging line to an error detection line. A metering module for charging metering is connected in series on the respective neutral lines of each charging pile, as Figure 1 shown. The construction method includes:

[0043] In step 201, the metering modules in each charging pile in the charging pile cluster are connected into a series relationship under the electrical characteristics of the detection wire through layout of the detection wire.

[0044] In the present invention, to achieve the above series relationship, it can be in a way of permanently fixing and maintaining the series relationship, or in a way of temporarily completing the connection of the series relationship before the charging pile error detection.

[0045] For the permanent method, its impact on the accuracy of the final metering error calculation is smaller; for the temporary method, on the one hand, the convenience of assembly is not easy to control. Even if a plug-and-play method is set at the corresponding interface to connect the detection wire in series in the original charging pile charging line, it will also bring problems of impedance consistency, thus bringing unnecessary noise interference to the final calculation result. Therefore, the recommended implementation method of the present invention is the above-mentioned permanent method.

[0046] In step 202, when each charging pile exits the charging operation, the charging gun is in an idle state, and the switch located between the metering module and the AC / DC converter of the charging pile is in an open state, so that the metering module of each charging pile is switched from its original electrical connection of the charging pile to the series connection relationship, and a detection line for the power metering error of the charging pile cluster is obtained.

[0047] The above-mentioned charging pile exiting the charging operation and the charging gun being in an idle state are actually equivalent concepts. The difference is that the former is described from the overall perspective of the charging pile, while the latter specifically refers to the state described from the perspective of the charging gun. Among them, the switch located between the metering module and the AC / DC converter of the charging pile is one of the improvement points proposed in the embodiment of the present invention. As Figure 2 shown, it 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 of the two charging guns has its own independent metering unit, and above the metering unit, an AC / DC converter can be independently connected respectively (as Figure 2 shown, the AC / DC converters A / D:1 and A / D:2 are respectively connected to the metering units W1 and W2, and respectively provide the electric energy required for charging for the #1 charging gun and the #2 charging gun), or a relatively powerful AC / DC converter can provide the electric energy required for charging for the two charging guns (not directly shown in Figure 2 ).

[0048] The embodiment of the present invention can detect the power metering error of the charging pile cluster on a large scale, and provides a construction method for the corresponding detection line, improving the efficiency of charging pile error detection and reducing the detection cost.

[0049] In the embodiment of the present invention, for the metering module of each charging pile, the end close to the AC / DC converter is described as the first port, and the other end close to the charging gun is described as the second port. Then, by arranging the detection wires, the metering modules in each charging pile in the charging pile cluster are connected into a series connection relationship under the electrical characteristics of the detection wires, specifically including (the following technical solutions will still take Figure 2 as the example scenario and will be described through Figure 3 to illustrate the structural characteristics of the series connection relationship here. It should be noted that in order to avoid the situation of content coverage due to too many labeled objects in the drawings, therefore, Figure 3 does not mark the first port and the second port of the metering module, and the corresponding content can refer to the marked content in Figure 2 ):

[0050] The metering module of the first charging pile located at the head of the series connection relationship (in Figure 3In the figure, the first port of the metering module W1) is led out through a wire as an input end of the series connection relationship; in turn, the second port of the metering module of the previous charging pile is connected to the first port of the metering module of the next charging pile to complete the establishment of the series connection relationship between the metering modules of each charging pile in the charging pile cluster; among them, the second port of the metering module of the last charging pile is used as the other input end of the series connection relationship. In Figure 3 it, one input end of the corresponding series connection relationship and the other input end of the series connection relationship respectively correspond to Figure 3 the two ports led out from the leftmost side in the figure, and, the one with a relatively higher position is the one input end of the series connection relationship, and the one with a relatively lower position is the other input end of the series connection relationship.

[0051] After the above content is expanded, the core part of the construction method of the present invention that can switch the charging line to the error detection line has been shown. If the detection architecture as Figure 3 shown is to be applied to a specific detection method, as Figure 4 shown, the method further includes:

[0052] Connect both ends of the power metering error detection line of the charging pile cluster to a power metering error detection system composed of a detection power supply, a detection load, and a standard power metering device respectively;

[0053] By comparing the metering results of the standard power metering device and the metering results of the metering modules in each charging pile, the metering errors of each metering module can be obtained.

[0054] The power metering error detection system further includes a power data collector and a calculation system; among them, the power data collector is used to collect the metering values of the metering modules in each charging pile and the standard power metering device, and transmit them to the calculation system; the calculation system is used to complete the calculation of the metering errors of each metering module. 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.

[0055] In an embodiment of the present invention, the detection load includes a real load using the power battery of an electric vehicle as the detection load, a specially designed equivalent load, or a virtual load simulated by an independent current source and voltage source respectively.

[0056] In an embodiment of the present invention, in order to enable the metering module in the series connection relationship to have no connection point with the power supply circuit of each charging pile and be in an electrically isolated state; and show the characteristic that the metering modules of each charging pile in the series connection relationship are sequentially connected in series by detection wires, as Figure 5The figure shows an equivalent structure diagram of the corresponding series connection relationship; among them, the power supply circuit includes the AC-DC converter and the load to be charged. As Figure 3 and Figure 4 shown, a switch is provided between the metering unit and the AC-DC converter. Corresponding to each AC-DC converter A / D:n in the figure, a switch n is connected in series at its negative pole, where n is a natural number. Therefore, the construction method further includes:

[0057] A toggle switch or a wireless transmitter is provided in the charging gun of each charging pile;

[0058] 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 metering module 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 metering module and the AC-DC converter of the charging pile to be in an open state; as Figure 6 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 provided on the side wall of the charging female port of the charging gun, so that Figure 6 the shown toggle switch is closed, and the corresponding toggle switch is connected to the switch shown in Figure 4 such as (for example: switch 1, switch 2 or switch n). And 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, so as to complete the closing of the electromagnetic switch shown in Figure 6 so as to ensure that after having the improved structure shown in Figure 6 , 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 metering unit will be in an electrically isolated state relative to the charging pile. Then, once it can be confirmed that each charging gun in the entire charging pile cluster is in an idle state, then the detection process shown in Figure 4 can be directly and smoothly carried out. By Figure 4 and Figure 3 comparison, it is not difficult to find that to enter the detection state shown in Figure 4 , it is necessary to ensure that each charging gun in the charging pile cluster is in an idle state (i.e., the OFF state shown in 4). Relatively speaking, Figure 3 the state of the charging gun in is relatively random, and there are also those in the IN state, that is, the connected state.

[0059] 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 metering module and the AC / DC converter of the charging pile to be in a closed state; and is also used to send a second wireless signal when the charging gun is idle, so as to trigger the switch located between the metering module and the AC / DC converter of the charging pile to be in an open state. Compared with Figure 6 the structure shown, here, if a wireless transmitter is used, because it is necessary to ensure that when the charging gun is not working, for example, Figure 4 as shown, switch 1 needs to be in an open state, then 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, during the implementation of the embodiments 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 power in the load supplies the wireless transmitter, and the first wireless signal is sent, so as to complete Figure 4 the closing of the switch on the side of the AC / DC converter as shown, so that the charging gun is connected to the AC / DC converter, and then enters the normal charging state.

[0060] In the embodiments of the present invention, the metering module of the charging pile and the standard electric energy metering device for detection are both composed of a metering sensor and a standard electric energy meter, and the metering error is composed of the metering sensor error and the error of the standard electric energy metering device for detection.

[0061] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the embodiments can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. The storage medium can include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, etc.

[0062] 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 should be included in the protection scope of the present invention.

Claims

1. A construction method for switching a charging circuit to an error detection circuit, characterized in that, A metering module for providing charging billing is connected in series on each neutral wire of each charging pile. The construction method includes: Connecting the metering modules in each charging pile in the charging pile cluster into a series connection relationship under the electrical characteristics of the detection wire through a layout detection wire; When each charging pile exits the charging operation, the charging gun is in an idle state, and the switch located between the metering module and the AC / DC converter of the charging pile is in an open state, so that the metering module of each charging pile is switched from its original electrical connection of the charging pile to the series connection relationship, obtaining a detection line for the power metering error of the charging pile cluster.

2. The construction method for switching a charging circuit to an error detection circuit according to claim 1, wherein For the metering module of each charging pile, the end close to the AC / DC converter is described as the first port, and the other end close to the charging gun is described as the second port. Then, the step of connecting the metering modules in each charging pile in the charging pile cluster into a series connection relationship under the electrical characteristics of the detection wire specifically includes: Leading out the first port of the metering module of the first charging pile at the head of the series connection relationship through a wire as one input end of the series connection relationship; successively establishing the series connection relationship between the metering modules of each charging pile in the charging pile cluster in the manner that the second port of the metering module of the previous charging pile is connected to the first port of the metering module of the next charging pile; among them, the second port of the metering module of the last charging pile is used as the other input end of the series connection relationship.

3. The construction method for switching a charging circuit to an error detection circuit according to claim 1, characterized in that, The construction method further includes: Connecting the two ends of the detection line for the power metering error of the charging pile cluster to a power metering error detection system composed of a detection power supply, a detection load, and a standard power metering device respectively; Obtaining the metering error of each metering module by comparing the metering result of the standard power metering device with the metering result of the metering module in each charging pile.

4. The construction method for switching a charging line to an error detection line according to claim 3, characterized in that The power metering error detection system further includes a power data collector and a calculation system; Among them, the power data collector is used to collect the metering values of the metering modules in each charging pile and the standard power metering device, and transmit them to the calculation system; The calculation system is used to complete the calculation of the metering error of each metering module.

5. The construction method capable of switching a charging line to an error detection line according to claim 3, characterized in that The detection load includes an actual load using the power battery of an electric vehicle as the detection load, a specially designed equivalent load, or a virtual load simulated by independent current sources and voltage sources respectively.

6. The construction method capable of switching a charging circuit to an error detection circuit according to any one of claims 1-5, characterized in that The construction method 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 located between the metering module and the AC / DC converter of the charging pile to be in a closed state; and is also used to be in an open state when the charging gun is idle, so as to trigger the switch located between the metering module 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 metering module and the AC / DC converter of the charging pile to be in a closed state; and is also used to send a second wireless signal when the charging gun is idle, so as to trigger the switch located between the metering module and the AC / DC converter of the charging pile to be in an open state.

7. The construction method capable of switching a charging circuit to an error detection circuit according to any one of claims 1-5, characterized in that In a way that permanently fixes and maintains the series connection relationship, or, in a way that temporarily completes the connection of the series connection relationship before the error detection of the charging pile.

8. The construction method capable of switching a charging circuit to an error detection circuit according to any one of claims 1-5, characterized in that, The metering modules of each charging pile are switched from their original electrical connections of the charging piles to the series connection relationship. Specifically: The metering modules in the series connection relationship have no connected contacts with the power circuits of each charging pile and are in an electrically isolated state; and it shows the characteristic that the metering modules of each charging pile in the series connection relationship are sequentially connected in series by the detection wires; wherein, the power circuit includes the AC-DC converter and the load to be charged.

9. The construction method capable of switching a charging circuit to an error detection circuit according to any one of claims 1-5, characterized in that The metering module of the charging pile and the standard electrical energy metering device for detection are both composed of a metering sensor and a standard electrical energy meter, and the metering error is composed of the error of the metering sensor and the error of the standard electrical energy metering device for detection.

10. A detection method for detecting the metering error of a charging pile cluster, characterized in that, Using the structural method according to any one of claims 1-9 that can switch the charging line to the error detection line to construct a series connection relationship composed of the metering modules in each charging pile, and connecting the series connection relationship to an electrical energy metering error detection system composed of a detection power supply, a detection load, and a standard electrical energy metering device, and by comparing the metering results of the standard electrical energy metering device and the metering results of the metering modules in each charging pile, the metering errors of each metering module can be obtained.

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