Dual-mainboard electric energy meter

Abstract

The utility model relates to intelligent electric energy meter technical field discloses a double mainboard electric energy meter, include: electric energy meter casing, first mainboard, second mainboard, sampling module, measurement module, control module, display module and switching power module, wherein, first mainboard and second mainboard are laminatedly arranged in electric energy meter casing, and there is reserved isolated gap between first mainboard and second mainboard, sampling module and switching power module are integrated on first mainboard, measurement module, control module and display module are integrated on second mainboard. The first mainboard of integrated strong current module and the second mainboard of integrated weak current module in the electric energy meter of the utility model are through physical isolation, improve the heat dissipation capacity of electric energy meter, eliminate the strong electric interference of switching power module to measurement module and control module, reduce the electric energy meter calculation parameter drift that thermal stress brought, improve the operation stability of electric energy meter.

Description

Technical Field

[0001] This utility model relates to the field of smart energy meter technology, specifically to a dual-motherboard energy meter. Background Technology

[0002] Three-phase smart energy digital display meters are core equipment for energy metering, data acquisition, and management in modern power systems. Their metering accuracy, operational reliability, and long-term stability directly affect the efficiency of power grid operation. Currently, the mainboard designs of mainstream three-phase smart energy digital display meters on the market primarily adopt the following two schemes:

[0003] 1. Highly integrated single-board design: To reduce cost and size, the current trend is to integrate all functional circuits, including voltage sampling, current sampling, communication modules, pulse output, switching power supplies, and metering and management microcontrollers, onto a single printed circuit board. While this design reduces the number of connectors and simplifies assembly, it introduces inherent drawbacks that cannot be ignored.

[0004] 2. Inefficient multi-board design with poor functional partitioning: Some designs use multiple boards, but typically only the human-machine interface (such as the LCD screen) and buttons are separated into daughterboards, while the core high-voltage and low-voltage circuits, interference sources, and sensitive units are not effectively isolated. This design fails to fundamentally solve the interference problem and introduces new reliability risks by increasing the number of inter-board connectors. Utility Model Content

[0005] In view of this, the present invention provides a dual-motherboard power meter to solve the problem of poor anti-interference capability of existing power meters.

[0006] This utility model provides a dual-mainboard energy meter, comprising: an energy meter housing, a first mainboard, a second mainboard, a sampling module, a metering module, a control module, a display module, and a switching power supply module. The first and second mainboards are stacked within the energy meter housing, with an isolation gap between them. The sampling module and the switching power supply module are integrated on the first mainboard; the metering module, control module, and display module are integrated on the second mainboard. The input terminal of the sampling module receives electrical signals from the power line, and its output terminal is connected to the input terminal of the metering module. The communication terminal of the metering module is connected to the communication terminal of the control module. The input terminal of the switching power supply module is connected to an external power source, and its output terminal is connected to the power supply terminals of both the metering module and the control module. The first terminal of the control module is connected to the display module.

[0007] This utility model provides a dual-mainboard energy meter. The first mainboard integrates high-voltage modules such as a sampling module and a switching power supply module, while the second mainboard integrates low-voltage modules such as a metering module, a control module, and a display module. A gap between the two mainboards provides physical isolation, reducing interference from high-voltage to low-voltage circuits and even fundamentally eliminating interference from the switching power supply module to the metering and control modules. This significantly improves the metering accuracy and stability of the metering module, meeting high-precision requirements. Furthermore, the separate board design simplifies the complexity of single-board design, disperses heat sources, reduces overall temperature rise, lowers the overall failure rate of the energy meter, reduces parameter drift in the metering module caused by thermal stress, and improves long-term circuit stability. In addition, the two mainboards can be produced and tested in parallel, improving production efficiency and facilitating product series expansion and upgrades.

[0008] In one optional implementation, the sampling module includes: a three-phase voltage sampling voltage divider resistor network and a three-phase current sampling transformer, wherein the input terminal of the three-phase voltage sampling voltage divider resistor network is connected in parallel with the power line, and the output terminal of the three-phase voltage sampling voltage divider resistor network is connected to the input terminal of the metering module; the input terminal of the three-phase current sampling transformer is connected in series with the power line, and the output terminal of the three-phase current sampling transformer is connected to the input terminal of the metering module.

[0009] In one optional embodiment, the switching power supply module includes: an input filtering and rectifying unit, a control unit, and a transformer unit. The first terminal of the input filtering and rectifying unit is connected to an external power source; the second terminal of the input filtering and rectifying unit is connected to the first terminal of the control unit and the first terminal of the transformer unit; the third terminal of the input filtering and rectifying unit is connected to the second terminal of the control unit; the third and fourth terminals of the control unit are respectively connected to the second and third terminals of the transformer unit; and the fourth terminal of the transformer unit is connected to the power supply terminal of the metering module.

[0010] In one optional implementation, the display module includes a driving unit and a display screen, wherein the input terminal of the driving unit is connected to the first terminal of the control module, and the output terminal of the driving unit is connected to the input terminal of the display screen.

[0011] In one optional implementation, the dual-motherboard energy meter further includes: a communication module integrated on the first motherboard; the communication module is connected to the second end of the control module; the communication module adopts the MODBUS communication protocol.

[0012] In one alternative implementation, the dual-motherboard energy meter further includes: a touch button module integrated on the second motherboard; the touch button module is connected to a third terminal of the control module.

[0013] In one optional implementation, the dual-motherboard energy meter further includes: a storage module integrated on the second motherboard; the storage module is connected to the fourth terminal of the control module; the storage module is a dual-verification dual-backup memory.

[0014] In one optional implementation, the dual-motherboard energy meter further includes: an energy pulse output module integrated on the first motherboard; the energy pulse output module is connected to the output terminal of the metering module.

[0015] In one alternative implementation, the first motherboard and the second motherboard are connected via a pin header connector.

[0016] In one alternative implementation, thermal pads are attached to the back of both the first motherboard and the second motherboard. Attached Figure Description

[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a structural diagram of a dual-motherboard energy meter according to an embodiment of the present utility model;

[0019] Figure 2 This is a schematic diagram of the electrical connections of a dual-motherboard energy meter according to an embodiment of the present utility model;

[0020] Figure 3 This is a detailed circuit diagram of the metering module according to an embodiment of the present utility model;

[0021] Figure 4 This is a detailed circuit diagram of the control module according to an embodiment of the present utility model;

[0022] Figure 5 This is a composition diagram of the sampling module according to an embodiment of the present utility model;

[0023] Figure 6 This is a detailed circuit diagram of the sampling module according to an embodiment of the present utility model;

[0024] Figure 7 This is a composition diagram of a switching power supply module according to an embodiment of the present utility model;

[0025] Figure 8 This is a detailed circuit diagram of the switching power supply module according to an embodiment of the present utility model;

[0026] Figure 9This is a composition diagram of the display module according to an embodiment of the present utility model;

[0027] Figure 10 This is a detailed circuit diagram of the display module according to an embodiment of the present utility model;

[0028] Figure 11 This is a structural diagram of another dual-motherboard power meter according to an embodiment of the present utility model;

[0029] Figure 12 This is a schematic diagram of the electrical connection of another dual-motherboard power meter according to an embodiment of the present utility model;

[0030] Figure 13 This is a detailed circuit diagram of the communication module and the power pulse output module according to an embodiment of the present utility model;

[0031] Figure 14 This is a detailed circuit diagram of the touch button module according to an embodiment of the present utility model. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or a simple connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0036] Existing electricity meters have the following drawbacks:

[0037] (1) Severe internal electromagnetic interference: The switching power supply module in the energy meter operates in a high-frequency switching state, and its transformer, switching transistors, and other components are strong noise sources. The voltage and current sampling circuits process weak analog signals at the millivolt level, which are extremely sensitive to noise. Placing both on the same circuit board, high-frequency noise can easily enter the sampling circuit through spatial radiation and common ground impedance coupling paths, resulting in distorted sampling values, introducing metering errors that are difficult to compensate for, and restricting further improvement of the accuracy level of the energy meter (such as 0.5S class).

[0038] (2) Prominent contradictions in ground system design: Digital circuits (e.g., MCU, communication circuits), analog circuits (e.g., sampling circuits), and noise sources (e.g., power supplies) have drastically different requirements for "ground". Single-circuit motherboard design forces these circuits to share a ground plane. Digital ground noise will seriously pollute the purity of analog ground, destroy the reference ground potential of high-precision metering chips, and directly affect the accuracy of A / D conversion.

[0039] (3) Concentrated heat dissipation and thermal stress interference: Switching power supplies, linear regulators, communication interface chips, etc. are all major heat sources. The heat generated by their concentrated layout will cause local temperature rise on the circuit board, causing the sampling resistor value to drift and the reference voltage source to fluctuate, thus generating temperature drift error and affecting the long-term stability of the metering chip.

[0040] (4) Reduced reliability and maintenance difficulties: For a pre-integrated single-circuit motherboard, if any functional module (especially the vulnerable power module) is damaged, the entire motherboard may need to be replaced, resulting in high maintenance costs and significant waste.

[0041] To solve the above problems, this utility model provides a dual-motherboard energy meter, such as... Figure 1 As shown, it includes: an energy meter housing 1, a first main board 2, a second main board 3, a sampling module 4, a metering module 5, a control module 6, a display module 7, and a switching power supply module 8.

[0042] Figure 1 In the device, the first main board 2 and the second main board 3 are stacked inside the energy meter housing 1, and an isolation gap is reserved between the first main board 2 and the second main board 3; the sampling module 4 and the switching power supply module 8 are integrated on the first main board 2; the metering module 5, the control module 6 and the display module 7 are integrated on the second main board 3.

[0043] Specifically, Figure 1In this design, high-voltage modules such as the sampling module and switching power supply module are mounted on the first main board; low-voltage modules such as the metering module, control module, and display module are mounted on the second main board. The first and second main boards are stacked vertically, achieving functional separation while preventing electromagnetic interference from the high-voltage modules from affecting the accuracy of the low-voltage modules. A gap is reserved between the first and second main boards, using air to further enhance physical isolation. The internal area division and isolation structure of each main board naturally creates a heat dissipation effect, preventing heat accumulation and improving the service life of each module.

[0044] Optionally, operators can connect the first and second motherboards to different ground planes to form a layered grounding structure, thereby improving anti-interference capabilities.

[0045] Optionally, the first motherboard and the second motherboard are connected by a high-reliability board connector, such as ribbon cable soldering, pin header connector connection, or plug-in connection, so that the components on the two motherboards are electrically connected.

[0046] Figure 2 The diagram shows the electrical connections between the modules. The input terminal of the sampling module 4 receives the electrical signal from the power line, and the output terminal of the sampling module 4 is connected to the input terminal of the metering module 5. The communication terminal of the metering module 5 is connected to the communication terminal of the control module 6. The input terminal of the switching power supply module 8 is connected to an external power source, and the output terminal of the switching power supply module 8 is connected to the power supply terminals of the metering module 5 and the control module 6. The first terminal of the control module 6 is connected to the display module 7.

[0047] Optionally, the sampling module may include voltage transformers, voltage sampling divider resistor networks, current transformers, etc., for collecting voltage and current signals on the power line and sending them to the metering module.

[0048] Specifically, the control module controls the metering module to calculate and store electrical energy parameters based on electrical signals. The display module displays the electrical energy parameters.

[0049] Optionally, the electrical energy parameters include the total harmonic content of voltage and the total harmonic content of current. The electrical energy parameters may also include other parameters that can reflect the operating status of the power line, such as voltage, current, power, power factor, frequency, and electrical energy.

[0050] For example, Figure 3 The metering module consists of a metering chip U20 and its peripheral circuitry. Figure 4 It is a control module consisting of the main control chip U21 and its peripheral circuits.

[0051] It should be noted that the control module incorporates various existing and mature electrical energy parameter calculation software programs. This allows the control module to send calculation commands to the metering module via a communication terminal, and the metering module to calculate the corresponding electrical energy parameters based on the collected electrical signals. Those skilled in the art can adjust the types and number of software programs according to actual usage requirements to modify the metering module's ability to calculate various electrical energy parameters.

[0052] Optionally, the main control module is also used for user power data management, rate control, event logging, etc.

[0053] Optionally, the display module consists of a display screen and a driving circuit. The display screen can be a liquid crystal display (LCD) or an LED digital tube, and the driving circuit can control the display screen to display the electrical energy parameters stored in the control module.

[0054] Optionally, the first motherboard is located on the lower layer of the second motherboard, and the first motherboard is close to the inlet terminal of the energy meter housing, which facilitates the connection of the first motherboard with the external power supply and power lines; the second motherboard is located on the upper layer, which facilitates the window of the display module facing the energy meter and makes the energy meter assembly easier.

[0055] The dual-mainboard energy meter provided in this embodiment has the function of displaying the total harmonic content of three-phase voltage and the total harmonic content of three-phase current, so that users can directly observe the changes in harmonic content through the display module. When a power line fault occurs, the harmonic content data can be used as a reference to fundamentally and quickly eliminate the fault. At the same time, the power quality can be analyzed in real time based on the harmonic content, thereby accurately obtaining the current working status of the power line and avoiding the occurrence of faults.

[0056] This utility model provides a dual-mainboard energy meter. The first mainboard integrates high-voltage modules such as a sampling module and a switching power supply module, while the second mainboard integrates low-voltage modules such as a metering module, a control module, and a display module. A gap between the two mainboards provides physical isolation, reducing interference from high-voltage to low-voltage circuits and even fundamentally eliminating interference from the switching power supply module to the metering and control modules. This significantly improves the metering accuracy and stability of the metering module, meeting high-precision requirements. Furthermore, the separate board design simplifies the complexity of single-board design, disperses heat sources, reduces overall temperature rise, lowers the overall failure rate of the energy meter, reduces parameter drift in the metering module caused by thermal stress, and improves long-term circuit stability. In addition, the two mainboards can be produced and tested in parallel, improving production efficiency and facilitating product series expansion and upgrades.

[0057] In some alternative implementations, such as Figure 5As shown, the sampling module 4 includes a three-phase voltage sampling voltage divider resistor network 41 and a three-phase current sampling transformer 42. The input terminal of the three-phase voltage sampling voltage divider resistor network 41 is connected in parallel with the power line, and the output terminal of the three-phase voltage sampling voltage divider resistor network 41 is connected to the input terminal of the metering module 5. The input terminal of the three-phase current sampling transformer 42 is connected in series with the power line, and the output terminal of the three-phase current sampling transformer 42 is connected to the input terminal of the metering module 5.

[0058] Specifically, Figure 6 In the three-phase current sampling transformer, there are transformers U4, U5, and U6, which collect the currents of phases A, B, and C respectively. Resistors R1, R2, and R3 divide the voltage of phase A, resistors R4, R5, and R6 divide the voltage of phase B, and resistors R7, R8, and R9 divide the voltage of phase C.

[0059] Alternatively, voltage transformers can be used to collect voltage on power lines.

[0060] Optionally, when the power line is single-phase, those skilled in the art can adjust the topology of the components in the sampling module according to actual needs.

[0061] In some alternative implementations, such as Figure 7 As shown, the switching power supply module 8 includes: an input filter and rectifier unit 81, a control unit 82, and a transformer unit 83. The first end of the input filter and rectifier unit 81 is connected to an external power supply, the second end of the input filter and rectifier unit 81 is connected to the first end of the control unit 82 and the first end of the transformer unit 83, and the third end of the input filter and rectifier unit 81 is connected to the second end of the control unit 82. The third and fourth ends of the control unit 82 are respectively connected to the second and third ends of the transformer unit 83. The fourth end of the transformer unit 83 is connected to the power supply terminal of the metering module 5.

[0062] For example, Figure 8 In the input filter rectifier unit 81, resistors R40 and R71 are used to suppress electromagnetic interference and transient surge voltage or current to protect the subsequent circuits; the full-bridge rectifier D7 in the input filter rectifier unit 81 is used to convert AC input into unidirectional pulsating DC; the filter capacitor C11 in the input filter rectifier unit 81 is used to smooth the pulsating DC to obtain a more stable DC voltage and provide primary power supply for the transformer unit 83.

[0063] For example, Figure 8 In the process, the control chip U16 generates pulse width modulation signals to control the power supply and disconnection of the transformer unit 83, thereby achieving voltage regulation and energy transmission.

[0064] For example, Figure 8In this circuit, T3 is a high-frequency isolation transformer used to achieve energy transfer and electrical isolation from the primary to the secondary winding. It outputs DC voltage to different loads through the secondary windings Ns1 and Ns2. When the energy meter circuit includes a 485 circuit, diode U14 and resistor C7 rectify and filter the AC current induced by Ns2, respectively, to provide a stable DC voltage supply for the 485 circuit.

[0065] Optionally, Figure 8 In the switching power supply module, there may also be a voltage regulator circuit 84 consisting of a voltage regulator U12 and peripheral circuitry. This is used to stabilize the input voltage at a 5V output when the energy meter circuit includes a 485 circuit, thereby improving the power supply stability of subsequent circuits.

[0066] In some alternative implementations, such as Figure 9 As shown, the display module 7 includes a driving unit 71 and a display screen 72, wherein the input terminal of the driving unit 71 is connected to the first terminal of the control module 6, and the output terminal of the driving unit 71 is connected to the input terminal of the display screen 72.

[0067] For example, such as Figure 10 As shown, the driving unit includes a driving chip U1 and its peripheral circuits, and the display screen includes a 16×16 dot matrix display LED1. The driving unit drives the display screen to display characters or simple graphics at corresponding positions based on the power parameters stored in the control module. That is, it controls the voltage of the rows and columns of the dot matrix display LED1 to light up specific LEDs, thereby displaying characters or graphics.

[0068] Optionally, those skilled in the art can adjust the display screen model, dot matrix arrangement, etc., according to actual needs.

[0069] In some alternative implementations, such as Figure 11 As shown, the dual-motherboard energy meter also includes a communication module 9 integrated on the first motherboard 2. (As shown...) Figure 12 As shown, the communication module 9 is connected to the second end of the control module 6; the communication module 9 adopts the MODBUS communication protocol.

[0070] For example, such as Figure 13 As shown, the communication module 9 includes 485 transceivers U17 and U18, and a transceiver chip U10 for processing 485 signals. The communication module 9 adopts the MODBUS communication protocol and can simultaneously collect three-phase electrical parameters from the primary and secondary sides.

[0071] In some alternative implementations, such as Figure 11 As shown, the dual-motherboard energy meter also includes a touch button module 10 integrated on the second motherboard 3. (As shown...) Figure 12 As shown, the touch button module 10 is connected to the third end of the control module 6.

[0072] For example, such as Figure 14 As shown, users can perform data addition, subtraction, setting, and confirmation operations on the electricity meter using the data subtraction button U25, the data addition button U26, the setting button U27, and the confirmation button U2.

[0073] In some alternative implementations, such as Figure 11 As shown, the dual-motherboard energy meter also includes a storage module 11 integrated on the second motherboard 3. (As...) Figure 12 As shown, the storage module 11 is connected to the fourth terminal of the control module 6; the storage module 11 is a dual-verification dual-backup memory.

[0074] Optionally, the storage module uses electrically erasable programmable read-only memory (EEPROM) to store data, with dual data verification and dual backup. The stored data has its own backup address. When the main data verification fails, the data at the backup address is read, making data storage more secure and reliable.

[0075] In some alternative implementations, such as Figure 11 As shown, the dual-motherboard power meter also includes: a power pulse output module 12 integrated on the first motherboard 2. (As shown...) Figure 12 As shown, the power pulse output module 12 is connected to the output terminal of the metering module 5.

[0076] For example, such as Figure 13 As shown, the electrical pulse output module 12 includes an optocoupler U8, which can isolate input and output signals and prevent electrical interference.

[0077] In some alternative implementations, such as Figure 11 As shown, the first motherboard 2 and the second motherboard 3 are connected by a pin header connector 13.

[0078] Specifically, the pin header connector transmits electrical signals from the first motherboard to the second motherboard, and can also transmit the sampling electrical signals of the sampling module to the metering module on the second motherboard, and can also exchange communication signals between the two boards.

[0079] Optionally, thermal pads are attached to the back of both the first and second motherboards to further dissipate heat.

[0080] Optionally, the electrical components on the first and second motherboards are arranged in functional zones, with each zone physically isolated by copper-free isolation; the second motherboard adopts a double-layer board design, independent of the analog circuit, to provide a quiet working environment for the metering module.

[0081] It should be noted that those skilled in the art can adjust the stacked layout of the first and second motherboards, the types of interconnection components between boards, the internal area division and isolation structure of each motherboard, and the layered grounding structure of each motherboard according to actual usage requirements.

[0082] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A dual-mainboard energy meter, characterized in that, include: The electricity meter casing, first main board, second main board, sampling module, metering module, control module, display module, and switching power supply module, among which, The first motherboard and the second motherboard are stacked inside the energy meter housing, and an isolation gap is reserved between the first motherboard and the second motherboard; The sampling module and the switching power supply module are integrated on the first motherboard; The metering module, the control module, and the display module are integrated on the second motherboard; The sampling module receives the electrical signal from the power line at its input terminal, and its output terminal is connected to the input terminal of the metering module. The communication terminal of the metering module is connected to the communication terminal of the control module; The input terminal of the switching power supply module is connected to an external power source, and the output terminal of the switching power supply module is connected to the power supply terminals of the metering module and the control module. The first end of the control module is connected to the display module.

2. The dual-mainboard energy meter according to claim 1, characterized in that, The sampling module includes: a three-phase voltage sampling voltage divider resistor network and a three-phase current sampling transformer, wherein... The input terminal of the three-phase voltage sampling voltage divider resistor network is connected in parallel with the power line, and the output terminal of the three-phase voltage sampling voltage divider resistor network is connected to the input terminal of the metering module. The input terminal of the three-phase current sampling transformer is connected in series on the power line, and the output terminal of the three-phase current sampling transformer is connected to the input terminal of the metering module.

3. The dual-mainboard energy meter according to claim 1, characterized in that, The switching power supply module includes: an input filtering and rectification unit, a control unit, and a transformer unit, wherein... The first end of the input filtering and rectifying unit is connected to the external power supply, the second end of the input filtering and rectifying unit is connected to the first end of the control unit and the first end of the transformer unit, and the third end of the input filtering and rectifying unit is connected to the second end of the control unit. The third and fourth terminals of the control unit are respectively connected to the second and third terminals of the transformer unit; The fourth terminal of the transformer unit is connected to the power supply terminal of the metering module.

4. The dual-mainboard energy meter according to claim 1, characterized in that, The display module includes: a driving unit and a display screen, wherein... The input terminal of the drive unit is connected to the first terminal of the control module, and the output terminal of the drive unit is connected to the input terminal of the display screen.

5. The dual-mainboard energy meter according to claim 1, characterized in that, Also includes: The communication module integrated on the first motherboard; The communication module is connected to the second end of the control module; The communication module uses the MODBUS communication protocol.

6. The dual-mainboard energy meter according to claim 1, characterized in that, Also includes: A touch button module integrated on the second motherboard; The touch button module is connected to the third end of the control module.

7. The dual-mainboard energy meter according to claim 1, characterized in that, Also includes: The storage module is integrated on the second motherboard; The storage module is connected to the fourth terminal of the control module; The storage module is a dual-verification, dual-backup storage device.

8. The dual-mainboard energy meter according to claim 1, characterized in that, Also includes: An energy pulse output module integrated on the first motherboard; The power pulse output module is connected to the output terminal of the metering module.

9. The dual-mainboard energy meter according to claim 1, characterized in that, The first motherboard and the second motherboard are connected by a pin header connector.

10. The dual-mainboard energy meter according to claim 1, characterized in that, Both the first motherboard and the second motherboard have thermal pads attached to their backs.

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