Device and method for switching wiring modes of single-phase electric energy meter

Abstract

The invention discloses a single-phase electric energy meter wiring mode switching device and method, and the device comprises an input unit which is used for providing a working power supply for the switching device and receiving a wiring mode switching instruction; the control and drive unit is used for responding to the switching instruction and outputting a drive signal to the execution unit; and the execution unit is used for reconstructing a wiring path according to the driving signal, and the wiring path comprises a symmetric wiring path and an asymmetric wiring path. When the switching instruction is to switch from the symmetric wiring mode to the asymmetric wiring mode, the driving signal is a first signal, and the wiring path is an asymmetric path; and when the switching instruction is to switch from the asymmetric wiring mode to the symmetric wiring mode, the driving signal is a second signal, and the wiring path is a symmetric path. The problems of complex installation, error proneness and high operation and maintenance cost caused by wiring incompatibility of a traditional single-phase electric energy meter are solved, and the single-phase electric energy meter is high in environmental adaptability, simple and reliable in structure, convenient and visual to operate and capable of remarkably improving the installation and maintenance efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric energy meter, in particular to a switching device of single-phase electric energy meter wiring mode and a method thereof. BACKGROUND

[0002] The current standardization wiring mode of single-phase electric energy meter mainly includes symmetric type and asymmetric type. The traditional electric energy meter usually only supports a single wiring mode, and the installer must match the corresponding wiring rules according to the meter model during actual operation. Once the wiring is wrong, it may not only cause the meter to reverse and abnormal metering, but also may cause safety hazards. Especially in the scenarios of old community renovation and meter replacement, due to historical reasons, there are a large number of meters with different wiring habits. The installer needs to carefully distinguish the meter model, which not only increases the installation cost, but also increases the risk of operation errors. In addition, the existing technology also has deficiencies in the degree of intelligence. Although some high-end electric energy meters have wiring diagnosis function and can identify abnormal wiring conditions such as voltage and current phase error and current reverse, such products mainly aim at detecting and alarming wiring errors, and cannot fundamentally solve the compatibility problem between different wiring modes.

[0003] Therefore, how to use an effective method to overcome the defects of the prior art has become a technical problem to be solved. SUMMARY

[0004] The purpose of the present application is to provide a switching device of single-phase electric energy meter wiring mode and a method thereof to solve the above problems.

[0005] The technical scheme of the present application is as follows: a switching device of single-phase electric energy meter wiring mode, comprising: an input unit for providing working power for the switching device and receiving a switching instruction of wiring mode; wherein the wiring mode includes symmetric wiring mode and asymmetric wiring mode; a control and driving unit for responding to the switching instruction and outputting a driving signal to an execution unit; an execution unit for reconstructing a wiring path according to the driving signal, wherein the wiring path includes symmetric wiring path and asymmetric wiring path; When the switching instruction is from symmetric wiring mode to asymmetric wiring mode, the driving signal is a first signal, and the wiring path is an asymmetric path; when the switching instruction is from asymmetric wiring mode to symmetric wiring mode, the driving signal is a second signal, and the wiring path is a symmetric path.

[0006] As an improvement of an embodiment of the present application, the input unit includes a power input interface and a mode switching button, the power input interface is used for accessing working power, and the mode switching button is used for triggering the switching instruction of symmetric wiring mode or asymmetric wiring mode.

[0007] As one improvement of the embodiment of the present application, the control and drive unit comprises a single-chip microcomputer and a relay drive chip, the single-chip microcomputer is used for detecting the switching instruction and outputting a control signal to the relay drive chip, and the relay drive chip is used for outputting a drive signal to the execution unit after power amplification of the control signal.

[0008] As one improvement of the embodiment of the present application, the execution unit is a magnetic latching relay, which is used for receiving the drive signal and switching the on-off state of the contact to reconfigure the wiring path.

[0009] As one improvement of the embodiment of the present application, when the magnetic latching relay receives the first signal, the second wiring terminal of the single-phase electric energy meter is controlled to be conductive with the fire wire output, and the third wiring terminal is controlled to be conductive with the zero wire input, thereby forming an asymmetric path.

[0010] As one improvement of the embodiment of the present application, when the magnetic latching relay receives the second signal, the second wiring terminal of the single-phase electric energy meter is controlled to be conductive with the zero wire input, and the third wiring terminal is controlled to be conductive with the fire wire output, thereby forming a symmetric path.

[0011] As one improvement of the embodiment of the present application, the switching device further comprises a state indication unit, which is used for feeding back the current wiring mode.

[0012] As one improvement of the embodiment of the present application, the state indication unit comprises two LED indicator lights, which respectively correspond to display the symmetric wiring mode and the asymmetric wiring mode.

[0013] To achieve one of the above-mentioned purposes, an embodiment of the present application provides a single-phase electric energy meter wiring mode switching method, which is used for the wiring mode switching device as described in any one of the above-mentioned embodiments, and comprises the following steps: S1: the input unit receives a wiring mode switching instruction; S2: when the switching instruction is switching from the symmetric wiring mode to the asymmetric wiring mode, the control and drive unit outputs a first signal to the execution unit; when the switching instruction is switching from the asymmetric wiring mode to the symmetric wiring mode, the control and drive unit outputs a second signal to the execution unit; S3: when the control unit receives the first signal, the wiring path is reconfigured to an asymmetric path; when the control unit receives the second signal, the wiring path is reconfigured to a symmetric path.

[0014] As one improvement of the embodiment of the present application, when the switching device is provided with a state indication unit, it further comprises a step S4: the state indication unit feeds back the current wiring mode.

[0015] The single-phase electric energy meter wiring mode switching device and method provided by the embodiment of the present application have the following advantages: the mode switching can be triggered by a button, which fundamentally solves the problems of complex installation, error-prone, and high operation and maintenance cost caused by the non-compatibility of the traditional single-phase electric energy meter wiring, has high environmental adaptability, and has simple and reliable structure, convenient and intuitive operation, and significantly improves the installation and maintenance efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the single-phase electric energy meter wiring mode switching device according to the present application Figure One ; Figure 2 is a schematic diagram of the single-phase electric energy meter wiring mode switching device according to the present application Figure Two ; Figure 3 is a schematic diagram of the single-phase electric energy meter wiring mode switching device according to the present application Figure 4 is a schematic diagram of the relay according to the present application Figure 5 is a schematic diagram of the relay control according to the present application Figure 6 is a schematic diagram of the asymmetric wiring mode according to the present application Figure 7 is a schematic diagram of the symmetric wiring mode according to the present application Figure 8 is a schematic diagram of the single-phase electric energy meter wiring mode switching method according to the present application Figure One ; Figure 9 is a schematic diagram of the single-phase electric energy meter wiring mode switching method according to the present application Figure Two . DETAILED DESCRIPTION

[0017] The present application will be described in detail below with reference to the specific embodiments shown in the drawings. However, these embodiments do not limit the present application, and the structural, method, or functional changes made by those of ordinary skill in the art based on these embodiments are included in the protection scope of the present application.

[0018] The scope of the embodiments herein includes the full scope of the claims, and all available equivalents of the claims. Herein, the terms "first", "second", and the like, do not denote any order, quantity, combination, or importance, but are used to distinguish one element from another. In fact, a first element can be termed a second element, and vice versa. Also, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a structure, device, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such structure, device, or apparatus. Without more limitations, an element defined by an "including a" does not exclude the existence of additional identical elements in the structure, device, or apparatus that includes the element. Various embodiments are described herein with progression in a progressive manner, each embodiment emphasizing a different aspect or a different implementation of the various embodiments. Each embodiment can be combined with another embodiment to form another embodiment.

[0019] The terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, as used herein, indicate relative positions or orientation relationships based on the positions or orientation relationships shown in the drawings, and are only used for the convenience of description herein and simplification of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description herein, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be a mechanical connection or an electrical connection, it can be a connection between two elements, it can be a direct connection or an indirect connection through an intermediate medium, and the specific meaning of the above terms can be understood by those skilled in the art according to the specific circumstances.

[0020] The present application provides a switching device for single-phase electric energy meter wiring mode, as shown in Figure 1 The switching device comprises: An input unit 101 is configured to provide working power for the switching device and receive a switching instruction of the wiring mode; wherein the wiring mode comprises a symmetric wiring mode and an asymmetric wiring mode; A control and driving unit 102 is configured to respond to the switching instruction and output a driving signal to an execution unit; specifically, the control and driving unit 102 comprises a single-chip microcomputer and a relay driving chip, the single-chip microcomputer is configured to detect the switching instruction and output a control signal to the relay driving chip, and the relay driving chip is configured to amplify the power of the control signal and output a driving signal to the execution unit.

[0021] The execution unit 103 is used for reconstructing a wiring path according to the driving signal, wherein the wiring path includes a symmetric wiring path and an asymmetric wiring path; specifically, the execution unit 103 is a magnetic latching relay, which is used for receiving the driving signal and switching the on-off state of the contact to reconstruct the wiring path.

[0022] When the switching instruction is switching from the symmetric wiring mode to the asymmetric wiring mode, the driving signal is a first signal, and the wiring path is an asymmetric path; when the switching instruction is switching from the asymmetric wiring mode to the symmetric wiring mode, the driving signal is a second signal, and the wiring path is a symmetric path.

[0023] In practice, as shown in the figure, Figure 3 The input unit includes a power input interface and a mode switching button, the power input interface is connected with the power pin of the control and driving unit through a power line, and provides working power for the switching device; the mode switching button can adopt a self-resetting touch button, includes a symmetric mode switching button S1 and an asymmetric mode switching button S2, one end of the mode switching button is connected to the I / O port of the single-chip microcomputer, and the other end is grounded, when the button is pressed, a low-level trigger signal is detected by the corresponding I / O port, so that the input of the switching instruction is realized, and the mode mark is marked on the surface of the button, so that the installation personnel can quickly identify and operate.

[0024] The single-chip microcomputer can adopt STC8G1K08A type, the symmetric mode switching button S1 is connected through the P3.0 pin, the asymmetric mode switching button S2 is connected through the P3.2 pin, the trigger state of the button is detected in real time, and the logic control signal is output through the P5.4 pin and the P5.5 pin at the same time, which is used for controlling the working state of the relay driving chip; The relay driving chip can adopt MD7620A type, the relay driving chip is a special driving chip for a double-way magnetic latching relay, the 1 pin and the 2 pin of the chip are connected to the P5.4 pin and the P5.5 pin of the single-chip microcomputer respectively, the logic control signal output by the single-chip microcomputer is received, the 3 pin and the 4 pin of the chip are connected to the 12V power supply provided by the power input interface, the OA pin and the OB pin of the chip are used as output ends and are connected to both ends of the coil of the magnetic latching relay, and are used for outputting forward and reverse pulse currents to drive the magnetic latching relay to act.

[0025] In the application, when the magnetic latching relay receives the first signal, the second wiring end of the single-phase electric energy meter is controlled to be conducted with the live wire output, and the third wiring end is controlled to be conducted with the zero line input, so as to form an asymmetric path.

[0026] In the application, when the magnetic latching relay receives the second signal, the second wiring end of the single-phase electric energy meter is controlled to be conducted with the zero line input, and the third wiring end is controlled to be conducted with the live wire output, so as to form a symmetric path.

[0027] As shown in Figure 4 and Figure 5 , the magnetic latching relay can be a magnetic latching relay containing multiple sets of conversion contacts, with three sets of independent contacts; the two ends of the coil of the magnetic latching relay are respectively connected to the OA pin and the OB pin of the relay driving chip, and receive the positive and negative pulse currents output by the driving chip; the three sets of main contacts of the relay correspondingly connect the 2, 3, and 4 terminals of the meter terminal block to the zero line input, zero line output, and live line output of the external circuit, respectively, and the reconstruction of the wiring path is realized through the on-off combination of the contacts.

[0028] In some specific embodiments, when the magnetic latching relay receives the first signal output by the driving chip, the first signal is a negative pulse current, the coil is reversely energized to generate a magnetic field, and the internal three sets of contacts are driven to switch to an asymmetric wiring state, and the wiring path is an asymmetric path, as shown in Figure 6 , the asymmetric path can specifically be that the 2 terminal of the terminal block is closed through the 11 pin main contact and the 22 pin contact of the magnetic latching relay, and the circuit is connected with the external live line output L_OUT; the 3 terminal of the terminal block is closed through the 12 pin main contact and the 24 pin contact of the magnetic latching relay, and the circuit is connected with the external zero line input N_IN; the 4 terminal of the terminal block is closed through the 13 pin main contact and the 26 pin contact of the magnetic latching relay, and the circuit is connected with the external zero line output N_OUT; the 1 terminal of the terminal block still maintains direct connection with the external live line, and the connection relationship does not change; it can be understood that in this case, the wiring rule of the single-phase electric energy meter is that 1 and 3 are the incoming line terminals, and 2 and 4 are the outgoing line terminals, and the asymmetric wiring is realized.

[0029] When the magnetic latching relay receives the second signal output by the driving chip, the second signal is a positive pulse current, the coil is forwardly energized to generate a magnetic field, and the internal three sets of contacts are driven to switch to a symmetric wiring state, and the wiring path is a symmetric path, as shown in Figure 7 , the symmetric wiring state can specifically be that the 2 terminal of the terminal block is closed through the 11 pin main contact and the 21 pin contact of the magnetic latching relay, and the circuit is connected with the external zero line input N_IN; the 3 terminal of the terminal block is closed through the 12 pin main contact and the 23 pin contact of the magnetic latching relay, and the circuit is connected with the external zero line output N_OUT; the 4 terminal of the terminal block is closed through the 13 pin main contact and the 25 pin contact of the magnetic latching relay, and the circuit is connected with the external live line output L_OUT; the 1 terminal of the terminal block is the live line input L_IN, and is directly connected with the external live line regardless of the wiring mode, and the connection relationship does not change; it can be understood that in this case, the wiring rule of the single-phase electric energy meter is that 1 and 2 are the incoming line terminals, and 3 and 4 are the outgoing line terminals, and the symmetric wiring is realized.

[0030] In the present application, as shown in Figure 2 The switching device further comprises a state indicating unit 104 for feeding back the current wiring mode. In some specific embodiments, the state indicating unit comprises two LED indicators, which correspond to the symmetric wiring mode and the asymmetric wiring mode respectively.

[0031] In practice, the LED indicators can be patch-type light-emitting diodes, including a symmetric mode indicator LED1 and an asymmetric mode indicator LED2. The symmetric mode indicator LED1 can be green, and the asymmetric mode indicator LED2 can be red. The anode of the symmetric mode indicator LED1 is connected to the P3.3 pin of the single-chip microcomputer, and the cathode is grounded. The anode of the asymmetric mode indicator LED2 is connected to the P3.2 pin of the single-chip microcomputer, and the cathode is grounded. When the single-chip microcomputer outputs a high level, the corresponding LED indicator is turned on and emits light. When switched to the symmetric wiring mode, the P3.1 pin of the single-chip microcomputer outputs a high level, the symmetric mode indicator LED1 is turned on and emits light, and the installation personnel is fed back that the current wiring mode is the symmetric wiring mode. When switched to the asymmetric wiring mode, the P3.2 pin of the single-chip microcomputer outputs a high level, the asymmetric mode indicator LED2 is turned on and emits light, and the installation personnel is fed back that the current wiring mode is the asymmetric wiring mode. When the switching device does not receive a switching instruction or is in a standby state, the P3.1 pin and the P3.2 pin of the single-chip microcomputer both output a low level, and the symmetric mode indicator LED1 and the asymmetric mode indicator LED2 are both turned off to avoid power consumption.

[0032] The present application also provides a single-phase electric energy meter wiring mode switching method, which is used for the wiring mode switching device as claimed in any one of the above, as shown in Figure 8 The method comprises the following steps: S1: The input unit receives a wiring mode switching instruction. Specifically, the installation personnel presses the switching button corresponding to the mode according to the wiring type of the on-site line, S1 for the symmetric mode, and S2 for the asymmetric mode. S2: When the switching instruction is to switch from the symmetric wiring mode to the asymmetric wiring mode, the control and driving unit outputs a first signal to the execution unit. When the switching instruction is to switch from the asymmetric wiring mode to the symmetric wiring mode, the control and driving unit outputs a second signal to the execution unit. In practice, the single-chip microcomputer detects the low-level signal triggered by the button through the corresponding I / O port, analyzes and determines the target wiring mode, and then outputs the corresponding logic control signal from the P5.4 pin or the P5.5 pin. The relay driving chip receives the logic control signal output by the single-chip microcomputer, processes it through the internal pulse amplification circuit, and then outputs a 12V pulse current in the corresponding direction to the magnetic latching relay coil. S3: when the control unit receives the first signal, reconfiguring the wiring passage to an asymmetric passage; when the control unit receives the second signal, reconfiguring the wiring passage to a symmetric passage.

[0033] Here, the magnetic latching relay coil generates a magnetic field under the action of pulse current, drives the internal three groups of contacts to switch to the on-off state corresponding to the target wiring mode, and completes the wiring passage reconfiguration; In the application, when the switching device is provided with a state indicating unit, as shown in the figure, it further comprises the following step S4: the state indicating unit feeds back the current wiring mode. Figure 9

[0034] In practice, the single-chip microcomputer synchronously outputs a high-level signal to the driving circuit of the corresponding LED indicator light, lights up the LED indicator light of the target mode, and the installer confirms the switching result through the light state; after the contact switching is completed, the magnetic latching relay coil is powered off, and the current contact state is maintained by relying on the self magnetic latching characteristic, and the switching device enters a low-power steady-state operation until the next switching instruction is received.

[0035] The switching device and method for the wiring mode of the single-phase electric energy meter provided by the application solve the compatibility problem of the symmetric and asymmetric wiring modes of the single-phase electric energy meter. Through the one-key switching mechanism, the professional operation depending on manual judgment is simplified to ordinary mechanical action, the installer does not need to identify the line sequence, and only needs to press the corresponding key according to the on-site situation, so that the internal relay can automatically complete the circuit connection, and the installation time is greatly shortened.

[0036] The application can be a device, a method and / or a computer program product. The computer program product can include a readable storage medium on which is loaded a computer readable program instruction for causing a processor to implement various aspects of the application.

[0037] The storage medium can be a tangible device that maintains and stores instructions for use by an instruction execution device. The storage medium, for example, can include but is not limited to an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the storage medium include a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch cards or punched tape, and any suitable combination of the foregoing. A non-transitory, or non-transmission, medium as used herein refers to a medium that does not change characteristics of the medium over time during which it is used to store or transport the instructions.

[0038] ​It should be understood that although the present specification describes only a single embodiment, the disclosure of features or combinations of features in this specification is not to be construed as an exclusion of the same from other embodiments. It is therefore contemplated that the features and combinations thereof described throughout this specification can be subject to alteration without departing from the scope or spirit of the present disclosure.

[0039] The above detailed description merely describes preferred embodiments of the application, and is not intended to limit the scope of the application. Various modifications and alterations to this description will become apparent to those skilled in the art from this disclosure, and it is intended that the scope of the application should be determined by the scope of the appended claims and any equivalents thereof.

Claims

1. A switching device for the wiring mode of a single-phase energy meter, characterized in that, include: The input unit is used to provide operating power to the switching device and receive switching commands for the wiring mode; wherein, the wiring mode includes a symmetrical wiring mode and an asymmetrical wiring mode; A control and drive unit is used to respond to the switching command and output a drive signal to the execution unit; An execution unit is configured to reconstruct a wiring path based on the drive signal, wherein the wiring path includes a symmetrical wiring path and an asymmetrical wiring path; When the switching instruction is to switch from a symmetrical wiring mode to an asymmetrical wiring mode, the driving signal is a first signal and the wiring path is an asymmetrical path; when the switching instruction is to switch from an asymmetrical wiring mode to a symmetrical wiring mode, the driving signal is a second signal and the wiring path is a symmetrical path.

2. The switching device according to claim 1, characterized in that, The input unit includes a power input interface and a mode switching button. The power input interface is used to connect to a working power supply, and the mode switching button is used to trigger a switching command between symmetrical wiring mode and asymmetrical wiring mode.

3. The switching device according to claim 1, characterized in that, The control and drive unit includes a microcontroller and a relay driver chip. The microcontroller is used to detect switching commands and output control signals to the relay driver chip. The relay driver chip is used to amplify the control signals and output drive signals to the execution unit.

4. The switching device according to claim 1, characterized in that, The execution unit is a magnetic latching relay, which is used to receive the drive signal and switch the on / off state of the contacts to reconstruct the wiring path.

5. The switching device according to claim 4, characterized in that, When the magnetic latching relay receives the first signal, it controls the second terminal of the single-phase energy meter to connect with the live wire output and the third terminal to connect with the neutral wire input, forming an asymmetrical path.

6. The switching device according to claim 4, characterized in that, When the magnetic latching relay receives the second signal, it controls the second terminal of the single-phase energy meter to be connected to the neutral wire input and the third terminal to be connected to the live wire output, forming a symmetrical path.

7. The switching device according to claim 1, characterized in that, The switching device also includes a status indication unit for providing feedback on the current wiring mode.

8. The switching device according to claim 7, characterized in that, The status indicator unit includes two LED indicators, which respectively display the symmetrical wiring mode and the asymmetrical wiring mode.

9. A method for switching the wiring mode of a single-phase energy meter, used in the wiring mode switching device as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1: The input unit receives a wiring mode switching command; S2: When the switching instruction is to switch from a symmetrical wiring mode to an asymmetrical wiring mode, the control and drive unit outputs a first signal to the execution unit; when the switching instruction is to switch from an asymmetrical wiring mode to a symmetrical wiring mode, the control and drive unit outputs a second signal to the execution unit. S3: When the control unit receives the first signal, it reconstructs the wiring path into an asymmetric path; when the control unit receives the second signal, it reconstructs the wiring path into a symmetric path.

10. The switching method according to claim 9, characterized in that, When the switching device is equipped with a status indicator unit, the method further includes step S4: the status indicator unit provides feedback on the current wiring mode.

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