Internet of Things remote control electric energy meter circuit

Abstract

The utility model discloses an internet of things remote control electric energy meter circuit. The internet of things remote control electric energy meter circuit comprises a main control module, an edge calculation coprocessor module, a pulse metering module, a dual-mode communication module, a safety tripping module, a safety protection module, a three-phase voltage detection module and an infrared interaction module. The main control module is connected with the edge calculation coprocessor module, the dual-mode communication module, the safety tripping module, the safety protection module, the three-phase voltage detection module and the infrared interaction module, the pulse metering module is connected with the edge calculation coprocessor module, and the three-phase voltage detection module is connected with the dual-mode communication module. The internet of things remote control electric energy meter circuit has obvious advantages. High-precision electric energy metering and local data processing are realized, and the data reliability is guaranteed; dual-mode communication ensures stable and efficient data transmission; the safety tripping and protection module ensures the electricity utilization safety in all directions; and the intelligent level and the operation convenience of the electric energy meter are improved through a three-phase voltage detection and infrared interaction function.

Description

Technical Field

[0001] This utility model belongs to the field of electricity meter technology and relates to an Internet of Things (IoT) remote control electricity meter circuit. Background Technology

[0002] With the rapid development of smart grids and the Internet of Things (IoT) technologies, traditional electricity meters can no longer meet the demands of intelligent and automated management in modern power systems. Traditional electricity meters have limitations in remote control functionality, employing a single communication method that fails to achieve efficient and stable data transmission. They also lack security mechanisms, making them vulnerable to external interference and attacks. Furthermore, their data processing capabilities are limited, making it difficult to handle large volumes of complex electricity consumption data and enabling timely and accurate electricity metering and analysis. To achieve remote monitoring, accurate metering, and security protection for electricity meters, and to improve the operational efficiency and management level of power systems, it is necessary to develop an IoT-based remote control electricity meter circuit to meet the higher requirements of the modern electricity market for electricity metering equipment. Summary of the Invention

[0003] To address the problems existing in the background technology, this utility model proposes an Internet of Things (IoT) remote control power meter circuit.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an Internet of Things remote control energy meter circuit, comprising: a main control module, an edge computing coprocessor module, a pulse metering module, a dual-mode communication module, a safety tripping module, a safety protection module, a three-phase voltage detection module, and an infrared interaction module;

[0005] The main control module is connected to the edge computing coprocessor module, the dual-mode communication module, the safety trip module, the safety protection module, the three-phase voltage detection module, and the infrared interaction module. The pulse metering module is connected to the edge computing coprocessor module, and the three-phase voltage detection module is connected to the dual-mode communication module.

[0006] The edge computing coprocessor module includes: edge computing coprocessor 1, edge computing coprocessor 2, backup battery BT1, energy accumulation register, and metering dedicated chip;

[0007] The backup battery BT1 is connected to the energy accumulation register. The edge computing coprocessor 1, the edge computing coprocessor 2, and the energy accumulation register are respectively connected to the metering dedicated chip. The metering dedicated chip is connected to the SPI interface of the main control module.

[0008] The pulse metering module includes: the PA_H terminal of the energy meter, the PA_L terminal of the energy meter, resistor R1, resistor R2, optocoupler PH1, optocoupler PH2, Schmitt trigger U6, Schmitt trigger U7, and AND gate U8;

[0009] The PA_H terminal of the energy meter is connected to the optocoupler PH1 through a series resistor R1. The optocoupler PH1 is connected to the Schmitt trigger U6. The Schmitt trigger U6 is connected to the edge computing coprocessor 1 and the AND gate U8. The PA_L terminal of the energy meter is connected to the optocoupler PH2 through a series resistor R2. The optocoupler PH2 is connected to the Schmitt trigger U7. The Schmitt trigger U7 is connected to the edge computing coprocessor 2 and the AND gate U8. The AND gate U8 is connected to the INTO pin of the main control module.

[0010] The dual-mode communication module includes: comparator U4, carrier chip, common-mode choke L2, coupling transformer T1, SIM7600 chip, ferrite bead, level converter, RF end duplexer DPX1, antenna ANT, analog switch U5, and common communication bus;

[0011] The GPIO_A1 pin of the main control module is connected to comparator U4. Comparator U4 is connected to the EN_CP terminal of the carrier chip. The CP_IN / CP_OUT terminals of the carrier chip are connected to the common-mode choke L2. The common-mode choke L2 is connected to the coupling transformer T1. The UART1 interface of the main control module is connected to the coupling transformer T1. The coupling transformer T1 is connected to the analog switch U5. The UART_TX / RX pin of the SIM7600 chip is connected to the ferrite bead FB1. The ferrite bead FB1 is connected to the level converter U2. The UART2 interface of the main control module is connected to the level converter U2. The RF terminal of the SIM7600 chip is connected to the RF segment via duplexer DPX1. The RF segment is connected to the antenna ANT via duplexer DPX1. The level converter U2 is connected to the analog switch U5. The GPIO_B3 pin of the main control module is connected to the analog switch U5. The analog switch is connected to the common communication bus.

[0012] The safety trip module includes: resistor R3, resistor R4, optocoupler OC1, MOSFET Q1, relay K1, diode D4, self-diagnostic current sensor CT1, ADC chip U9, varistor RV1, resistor R15, and capacitor C18.

[0013] The TRIP_EN pin of the main control module drives the gate of MOSFET Q1 via optocoupler OC1. The TRIP_EN pin of the main control module is connected to resistors R3 and R4. The other end of resistor R3 is connected to the VCC power supply, and the other end of resistor R4 is connected to ground. The emitter of optocoupler OC1 is grounded, the source of MOSFET Q1 is grounded, and the drain of MOSFET Q1 is connected to the coil of relay K1. Diode D4 is connected in parallel across the coil of relay K1. The coil of relay K1 is connected to self-diagnostic current sensor CT1. The ground pin of self-diagnostic current sensor CT1 is connected to ground. Self-diagnostic current sensor CT1 is connected to ADC chip U9. The main control module is connected to ADC chip U9 via I2C bus. Varistor RV1 is connected in parallel across the contacts of relay K1. Resistor R15 and capacitor C18 are connected in series and then in parallel across the contacts of relay K1.

[0014] The safety protection module includes: gas discharge tube G1, self-resetting fuse PTC1, TVS diode array, UART circuit, ferrite bead FB2, ESD protection chip, shell sensing electrode PAD, and voltage detector.

[0015] The power input terminal is connected to the gas discharge tube G1, the gas discharge tube G1 is connected to the resettable fuse PTC1, the resettable fuse PTC1 is connected to the TVS diode array, the TVS diode array is connected to the internal power supply, the UART line is connected to the ESD protection chip through the series ferrite bead FB2, the outer casing sensing electrode PAD is connected to the voltage detector, and the voltage detector is connected to the interrupt pin of the main control module.

[0016] The three-phase voltage detection module includes: resistors R5, R7, R8, R10, R11, and R13, an operational amplifier, a multiplexer, and a current transformer CT2;

[0017] The live wire L1 is connected to one end of resistor R5. The other end of resistor R5 is connected to the operational amplifier and one end of resistor R7. The other end of resistor R7 is connected to ground. The live wire L2 is connected to one end of resistor R8. The other end of resistor R8 is connected to the operational amplifier and one end of resistor R10. The other end of resistor R10 is connected to ground. The live wire L3 is connected to one end of resistor R11. The other end of resistor R11 is connected to the operational amplifier and one end of resistor R13. The other end of resistor R13 is connected to ground. The operational amplifier is connected to the multiplexer. The multiplexer is connected to the ADC_IN interface of the main control module. The neutral wire is connected to the current transformer CT2. The current transformer CT2 is connected to the carrier chip.

[0018] Compared with existing technologies, this utility model has the following advantages: The pulse metering module, in conjunction with the edge computing coprocessor module, enables high-precision energy metering. The backup mechanism of the edge computing coprocessor ensures no data loss, improving metering reliability. The dual-mode communication module integrates multiple communication methods, enabling the energy meter to stably transmit data via power line carrier communication and achieve remote real-time communication via mobile communication networks, ensuring efficient and flexible data transmission. The safety tripping module and safety protection module provide comprehensive protection for electricity safety. The former can accurately control circuit on / off and perform real-time self-diagnosis, while the latter can resist external interference such as lightning strikes and static electricity, preventing illegal intrusion. Furthermore, the three-phase voltage detection module monitors the three-phase voltage in real time, and the infrared interaction module facilitates local operation, greatly enhancing the intelligence and practicality of the energy meter. Attached Figure Description

[0019] Figure 1 This is a main block diagram of an IoT remote control energy meter circuit according to this utility model;

[0020] Figure 2 This is a circuit connection diagram of the edge computing coprocessor module of this utility model;

[0021] Figure 3 This is the circuit connection diagram of the pulse metering module of this utility model;

[0022] Figure 4 This is the circuit connection diagram of the dual-mode communication module of this utility model;

[0023] Figure 5 This is the circuit connection diagram of the safety trip module of this utility model;

[0024] Figure 6 This is the circuit connection diagram of the safety protection module of this utility model;

[0025] Figure 7 This is the circuit connection diagram of the three-phase voltage detection module of this utility model. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] like Figures 1-7As shown, the technical solution adopted by this utility model is as follows: an Internet of Things remote control energy meter circuit, including: a main control module, an edge computing coprocessor module, a pulse metering module, a dual-mode communication module, a safety tripping module, a safety protection module, a three-phase voltage detection module, and an infrared interaction module.

[0028] The main control module is connected to the edge computing coprocessor module, the dual-mode communication module, the safety trip module, the safety protection module, the three-phase voltage detection module, and the infrared interaction module. The pulse metering module is connected to the edge computing coprocessor module, and the three-phase voltage detection module is connected to the dual-mode communication module.

[0029] The main control module is connected to the edge computing coprocessor via the SPI bus.

[0030] The carrier channel of the dual-mode communication module is connected to the main control module UART1 via isolation transformer T1, and the 4G channel is connected to the main control module UART2 via level converter U2.

[0031] The active pulse PA_H and reactive pulse PA_L of the pulse metering module are connected to the TIMER1 / TIMER2 pins of the edge computing coprocessor via optocouplers PH1 / PH2, respectively.

[0032] The driver of the safety trip module is connected to the TRIP_EN pin of the main control module and controls relay K1 through a multi-level isolation circuit.

[0033] The IR_IN / IR_OUT pins of the infrared interaction module are connected to the main control module UART3 via the bidirectional buffer U3.

[0034] The main control module, as the core of the circuit, coordinates the work of each module, processes data, controls commands, and manages communication.

[0035] The main control module uses an STM32F407 series microcontroller and communicates with other modules through interfaces such as SPI, UART, and I²C. It executes data processing tasks uploaded by the edge computing coprocessor, interacts with the remote server through a dual-mode communication module, and controls the safety trip module according to instructions.

[0036] The core component of the infrared interaction module is the TSOP38238, an infrared receiver that receives 38kHz carrier signals. It supports local infrared programming and parameter setting without requiring the cover to be opened.

[0037] The infrared receiver converts the optical signal into an electrical signal, which is then decoded and parsed into control commands by the main control module.

[0038] The edge computing coprocessor module includes: edge computing coprocessor 1, edge computing coprocessor 2, backup battery BT1, energy accumulation register, and metering dedicated chip.

[0039] The backup battery BT1 is connected to the energy accumulation register. The edge computing coprocessor 1, the edge computing coprocessor 2, and the energy accumulation register are respectively connected to the metering dedicated chip. The metering dedicated chip is connected to the SPI interface of the main control module.

[0040] Both Edge Computing Coprocessor 1 and Edge Computing Coprocessor 2 use the ESP32-WROOM-32D, a dual-core 32-bit processor that supports WiFi and Bluetooth and is responsible for local data processing.

[0041] The backup battery BT1 uses a CR2032 button cell to maintain the energy accumulation register data when the main power is interrupted.

[0042] The power accumulation register uses the DS1307 real-time clock chip and has 56 bytes of built-in non-volatile RAM to store power data.

[0043] The dedicated metering chip uses the ADE7878, a high-precision three-phase energy metering chip that supports active / reactive / apparent energy measurement.

[0044] When the edge computing coprocessor module is working, the dedicated metering chip ADE7878 collects power data in real time and converts it into a processable signal form. Edge computing coprocessor 1 and edge computing coprocessor 2 process this data in parallel, performing preliminary analysis, calculation, and processing of the power data, such as determining power consumption status and calculating power consumption, thus achieving preliminary analysis and processing of local data and reducing the computational burden on the main control module. Backup battery BT1 supplies power to the power accumulation register DS1307, ensuring that the power data stored in the register is not lost when the main power supply fails. After processing, the data is transmitted to the main control module via the SPI interface, enabling the main control module to perform subsequent higher-level control and communication management.

[0045] The pulse metering module includes: the PA_H terminal of the energy meter, the PA_L terminal of the energy meter, resistor R1, resistor R2, optocoupler PH1, optocoupler PH2, Schmitt trigger U6, Schmitt trigger U7, and AND gate U8.

[0046] The PA_H terminal of the energy meter is connected to the optocoupler PH1 through a series resistor R1. The optocoupler PH1 is connected to the Schmitt trigger U6. The Schmitt trigger U6 is connected to the edge computing coprocessor 1 and the AND gate U8. The PA_L terminal of the energy meter is connected to the optocoupler PH2 through a series resistor R2. The optocoupler PH2 is connected to the Schmitt trigger U7. The Schmitt trigger U7 is connected to the edge computing coprocessor 2 and the AND gate U8. The AND gate U8 is connected to the INTO pin of the main control module.

[0047] Optocouplers PH1 and PH2 use PC817 to isolate high-voltage and low-voltage circuits and convert electrical pulses into digital signals.

[0048] Schmitt triggers U6 and U7 use a 74HC14 to shape pulse signals and improve anti-interference capabilities.

[0049] The AND gate U8 uses a 74HC08 for logical AND operation to ensure dual-channel pulse consistency verification.

[0050] When the pulse metering module is working, the pulse signal output from the PA_H terminal of the energy meter enters the optocoupler PH1 after passing through the series resistor R1. The optocoupler converts the high-voltage pulse signal into a low-voltage signal to achieve electrical isolation. The converted signal is then transmitted to the Schmitt trigger U6 for shaping to remove glitches and interference from the signal, making the pulse signal more regular.

[0051] Similarly, the pulse signal output from the PA_L terminal of the energy meter undergoes the same processing through resistor R2, optocoupler PH2, and Schmitt trigger U7.

[0052] The shaped signals are transmitted to edge computing coprocessors 1 and 2 respectively, while the other signal is input to AND gate U8. The AND gate performs logical checks to ensure the consistency of the two pulse signals. Finally, AND gate U8 outputs the processed signal to the INTO pin of the main control module for calculations and processing related to power metering.

[0053] The dual-mode communication module includes: comparator U4, carrier chip, common-mode choke L2, coupling transformer T1, SIM7600 chip, ferrite bead, level converter, RF end duplexer DPX1, antenna ANT, analog switch U5, and common communication bus. The carrier chip is Dingxin DX-CC01.

[0054] The GPIO_A1 pin of the main control module is connected to comparator U4. Comparator U4 is connected to the EN_CP terminal of the Dingxin chip DX-CC01. The CP_IN / CP_OUT terminals of the Dingxin chip DX-CC01 are connected to the common-mode choke L2. The common-mode choke L2 is connected to the coupling transformer T1. The UART1 interface of the main control module is connected to the coupling transformer T1. The coupling transformer T1 is connected to the analog switch U5. The UART_TX / RX pin of the SIM7600 chip is connected to the ferrite bead FB1. The ferrite bead FB1 is connected to the level converter U2. The UART2 interface of the main control module is connected to the level converter U2. The RF terminal and RF segment of the SIM7600 chip are connected to the RF segment via duplexer DPX1. The RF segment is connected to the antenna ANT via duplexer DPX1. The level converter U2 is connected to the analog switch U5. The GPIO_B3 pin of the main control module is connected to the analog switch U5. The analog switch is connected to the common communication bus.

[0055] Dingxin DX-CC01 is a power line carrier communication chip that supports high-speed data transmission.

[0056] The SIM7600 chip is a 4G communication module that supports multiple frequency bands including LTE-FDD, LTE-TDD, WCDMA, and GSM.

[0057] The analog switch U5 uses ADG706 to switch between two communication modes.

[0058] The main control module outputs a control signal from its GPIO_A1 pin to comparator U4. Comparator U4 processes the signal and controls the EN_CP pin of the Dingxin DX-CC01 chip to enable or disable the power line carrier communication function. The signals output from the CP_IN / CP_OUT pins of the Dingxin DX-CC01 chip are coupled to the power line for transmission via a common-mode choke L2 and a coupling transformer T1. Simultaneously, the main control module is connected to the coupling transformer T1 through the UART1 interface to achieve data interaction with the Dingxin chip.

[0059] On the other hand, the signal output from the UART_TX / RX pins of the SIM7600 chip is first filtered by the ferrite bead FB1, then level-converted by the level converter U2 before being connected to the UART2 interface of the main control module. The RF terminal of the SIM7600 chip is connected to the antenna ANT via the duplexer DPX1 to realize 4G wireless communication. The GPIO_B3 pin of the main control module controls the analog switch U5. According to the communication requirements, the analog switch U5 switches between power line carrier communication and 4G wireless communication, selecting the corresponding communication channel and transmitting data through the common communication bus, thereby realizing dual-mode communication.

[0060] The safety trip module includes: resistor R3, resistor R4, optocoupler OC1, MOSFET Q1, relay K1, diode D4, self-diagnostic current sensor CT1, ADC chip U9, varistor RV1, resistor R15, and capacitor C18.

[0061] The TRIP_EN pin of the main control module drives the gate of MOSFET Q1 via optocoupler OC1. The TRIP_EN pin of the main control module is connected to resistors R3 and R4. The other end of resistor R3 is connected to the VCC power supply, and the other end of resistor R4 is connected to ground. The emitter of optocoupler OC1 is grounded, the source of MOSFET Q1 is grounded, and the drain of MOSFET Q1 is connected to the coil of relay K1. Diode D4 is connected in parallel across the coil of relay K1. The coil of relay K1 is connected to self-diagnostic current sensor CT1. The ground pin of self-diagnostic current sensor CT1 is connected to ground. Self-diagnostic current sensor CT1 is connected to ADC chip U9. The main control module is connected to ADC chip U9 via I2C bus. Varistor RV1 is connected in parallel across the contacts of relay K1. Resistor R15 and capacitor C18 are connected in series and then in parallel across the contacts of relay K1.

[0062] The optocoupler OC1 uses MOC3063 to isolate control signals from high-voltage circuits.

[0063] The MOSFET Q1 is an IRF540N, which drives the relay coil.

[0064] Relay K1 uses JQC-3FF / 12V and controls the on / off state of the main circuit.

[0065] The self-diagnostic current sensor CT1 uses the ACS758 to monitor the relay coil current in real time.

[0066] The ADC chip U9 uses the ADS1115, a high-precision analog-to-digital converter, to acquire current data from the self-diagnostic current sensor CT1.

[0067] The TRIP_EN pin of the main control module outputs a control signal, which is divided by resistors R3 and R4 and then input to optocoupler OC1. Optocoupler OC1 converts the weak current control signal into a drive signal for the gate of MOSFET Q1, controlling the conduction and cutoff of MOSFET Q1. The drain of MOSFET Q1 is connected to the coil of relay K1. When MOSFET Q1 is on, the coil of relay K1 is energized, the contacts close, and the main circuit is on; conversely, the main circuit is off. Diode D4 is connected in parallel across the coil of relay K1 to suppress the back electromotive force generated when the coil is de-energized, protecting circuit components. The self-diagnostic current sensor CT1 monitors the current in the coil of relay K1 in real time, converts the current signal into a voltage signal, and inputs it to ADC chip U9. ADC chip U9 converts the analog signal into a digital signal and transmits it to the main control module via the I2C bus. The main control module analyzes the current data to determine whether the operating status of relay K1 is normal. A varistor RV1 is connected in parallel across the contacts of relay K1. When the contacts open and a voltage surge occurs, the resistance of varistor RV1 drops rapidly, absorbing the surge energy and protecting the circuit. Resistor R15 and capacitor C18 are connected in series and then in parallel across the contacts of relay K1, forming an RC absorption circuit to suppress the arc generated when the contacts open, thus extending the service life of the relay.

[0068] The safety protection module includes: gas discharge tube G1, self-resetting fuse PTC1, TVS diode array, UART circuit, ferrite bead FB2, ESD protection chip, housing sensing electrode PAD, and voltage detector.

[0069] The power input terminal is connected to the gas discharge tube G1, the gas discharge tube G1 is connected to the resettable fuse PTC1, the resettable fuse PTC1 is connected to the TVS diode array, the TVS diode array is connected to the internal power supply, the UART line is connected to the ESD protection chip through the series ferrite bead FB2, the outer casing sensing electrode PAD is connected to the voltage detector, and the voltage detector is connected to the interrupt pin of the main control module.

[0070] The gas discharge tube G1 adopts UN2E230L, which is protected against lightning surges and has a current carrying capacity of ≥10kA.

[0071] The self-resetting fuse PTC1 uses the JK60-090 type, provides overcurrent protection, and has an operating current of 0.9A.

[0072] The TVS diode array uses SM712 to suppress static electricity and surges, with a response time of <1ns.

[0073] The ESD protection chip uses LC05CI to protect the UART circuit, with a contact discharge capability of ±15kV.

[0074] A gas discharge tube G1 is connected to the power input terminal. In the event of a lightning strike or surge, G1 quickly conducts, discharging most of the surge current to ground and initially reducing voltage impact. Remaining energy is further limited by a resettable fuse PTC1. When an overcurrent occurs, the resistance of PTC1 increases sharply, limiting current flow. After the fault is cleared, it automatically returns to a low-resistance state. A TVS diode array is connected in parallel to the internal power supply line. It breaks down rapidly during instantaneous overvoltage, clamping the voltage within a safe range and protecting downstream circuit components. A ferrite bead FB2 is connected in series with the UART communication line. The bead's high-frequency impedance characteristics filter out high-frequency interference, and it is further protected by an ESD protection chip to prevent electrostatic discharge from damaging the internal circuitry. The outer casing's sensing electrode PAD continuously monitors the external environment. When an abnormal voltage is detected, such as static electricity from a human body or electromagnetic interference, the voltage detector transmits a signal to the interrupt pin of the main control module, triggering the system protection mechanism to prevent interference from affecting the normal operation of the circuit.

[0075] Besides UART communication lines, serial communication lines such as SPI and I2C can also be protected using similar circuit connections. This ensures stable operation of communication interfaces like SPI and I2C in harsh electromagnetic environments, and the protection principle is the same as that for UART lines.

[0076] The three-phase voltage detection module includes: resistors R5, R7, R8, R10, R11, and R13, an operational amplifier, a multiplexer, and a current transformer CT2.

[0077] The live wire L1 is connected to one end of resistor R5. The other end of resistor R5 is connected to the operational amplifier and one end of resistor R7. The other end of resistor R7 is connected to ground. The live wire L2 is connected to one end of resistor R8. The other end of resistor R8 is connected to the operational amplifier and one end of resistor R10. The other end of resistor R10 is connected to ground. The live wire L3 is connected to one end of resistor R11. The other end of resistor R11 is connected to the operational amplifier and one end of resistor R13. The other end of resistor R13 is connected to ground. The operational amplifier is connected to the multiplexer. The multiplexer is connected to the ADC_IN interface of the main control module. The neutral wire is connected to the current transformer CT2. The current transformer CT2 is connected to the Dingxin chip DX-CC01.

[0078] The operational amplifier used is LM358, which amplifies voltage signals.

[0079] The multiplexer uses CD4051 to switch the three-phase voltage sampling channels.

[0080] The current transformer CT2 uses the HCT2025 and is used to detect the neutral current.

[0081] In the three-phase voltage detection module, the live wires L1, L2, and L3 are divided by resistors R5, R8, and R11 respectively, and then grounded through resistors R7, R10, and R13. Simultaneously, they are connected to an operational amplifier for signal amplification. The amplified three-phase voltage signal is input to a multiplexer. Under the control of the main control module, the multiplexer selects each phase voltage signal in a time-division manner and sends it to the ADC_IN interface of the main control module for conversion into digital signals for processing. The neutral wire current signal is converted into a measurable electrical signal through the current transformer CT2 and transmitted to the Dingxin DX-CC01 chip for signal coupling and processing in power line carrier communication, achieving synchronous monitoring of the three-phase voltage and neutral wire current.

[0082] When the IoT remote control of the electricity meter circuit is in operation, the main control module acts as the core, coordinating the operation of each module. The pulse metering module converts the pulse signal output by the electricity meter into a digital signal through an optocoupler, and after being shaped by a Schmitt trigger and verified by an AND gate, it is transmitted to the edge computing coprocessor module. The edge computing coprocessor module processes and stores the electricity data locally, and then feeds the results back to the main control module via the SPI interface. In the dual-mode communication module, the main control module controls the analog switch through GPIO pins based on environmental signals, selecting the Dingxin DX-CC01 chip for power line carrier communication, or using the SIM7600 chip for 4G wireless communication to complete remote data transmission. The safety trip module receives the TRIP_EN signal from the main control module, drives the MOSFET after optocoupler isolation, controls the relay on / off circuit, and at the same time, the self-diagnostic current sensor monitors the relay status, which is fed back to the main control module via the ADC chip to form a closed-loop control. The safety protection module starts from the power supply end, with gas discharge tubes, self-resetting fuses, and TVS diode arrays providing sequential protection against surges, overcurrents, and overvoltages. The communication lines are protected against interference by ferrite beads and ESD protection chips. The outer casing electrodes monitor abnormal voltages and trigger the main control protection. The three-phase voltage detection module uses resistors to divide the voltage, amplifies it with an operational amplifier, and then uses a multiplexer to collect the three-phase voltages in a time-division manner, inputting them to the main control module's ADC interface. The neutral current is collected by a current transformer for carrier coupling. The infrared interaction module receives infrared signals, decodes them, and provides the main control module with local operation commands, ultimately achieving remote control, accurate metering, and safe operation of the energy meter.

[0083] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An Internet of Things remote control electric energy meter circuit, characterized in that, It includes: main control module, edge computing coprocessor module, pulse metering module, dual-mode communication module, safety trip module, safety protection module, three-phase voltage detection module, and infrared interaction module; The main control module is connected to the edge computing coprocessor module, the dual-mode communication module, the safety trip module, the safety protection module, the three-phase voltage detection module, and the infrared interaction module. The pulse metering module is connected to the edge computing coprocessor module, and the three-phase voltage detection module is connected to the dual-mode communication module.

2. The IoT remote control electric energy meter circuit according to claim 1, wherein, The edge computing coprocessor module includes: edge computing coprocessor 1, edge computing coprocessor 2, backup battery BT1, energy accumulation register, and metering dedicated chip; The backup battery BT1 is connected to the energy accumulation register. The edge computing coprocessor 1, the edge computing coprocessor 2, and the energy accumulation register are respectively connected to the metering dedicated chip. The metering dedicated chip is connected to the SPI interface of the main control module.

3. The IoT remote control electric energy meter circuit according to claim 2, wherein, The pulse metering module includes: the PA_H terminal of the energy meter, the PA_L terminal of the energy meter, resistor R1, resistor R2, optocoupler PH1, optocoupler PH2, Schmitt trigger U6, Schmitt trigger U7, and AND gate U8; The PA_H terminal of the energy meter is connected to the optocoupler PH1 through a series resistor R1. The optocoupler PH1 is connected to the Schmitt trigger U6. The Schmitt trigger U6 is connected to the edge computing coprocessor 1 and the AND gate U8. The PA_L terminal of the energy meter is connected to the optocoupler PH2 through a series resistor R2. The optocoupler PH2 is connected to the Schmitt trigger U7. The Schmitt trigger U7 is connected to the edge computing coprocessor 2 and the AND gate U8. The AND gate U8 is connected to the INTO pin of the main control module.

4. The IoT remote control electric energy meter circuit according to claim 1, wherein, The dual-mode communication module includes: comparator U4, carrier chip, common-mode choke L2, coupling transformer T1, SIM7600 chip, ferrite bead, level converter, RF end duplexer DPX1, antenna ANT, analog switch U5, and common communication bus; The GPIO_A1 pin of the main control module is connected to comparator U4. Comparator U4 is connected to the EN_CP terminal of the carrier chip. The CP_IN / CP_OUT terminals of the carrier chip are connected to the common-mode choke L2. The common-mode choke L2 is connected to the coupling transformer T1. The UART1 interface of the main control module is connected to the coupling transformer T1. The coupling transformer T1 is connected to the analog switch U5. The UART_TX / RX pin of the SIM7600 chip is connected to the ferrite bead FB1. The ferrite bead FB1 is connected to the level converter U2. The UART2 interface of the main control module is connected to the level converter U2. The RF terminal of the SIM7600 chip is connected to the RF segment via duplexer DPX1. The RF segment is connected to the antenna ANT via duplexer DPX1. The level converter U2 is connected to the analog switch U5. The GPIO_B3 pin of the main control module is connected to the analog switch U5. The analog switch is connected to the common communication bus.

5. The IoT remote control electric energy meter circuit according to claim 1, wherein, The safety trip module includes: resistor R3, resistor R4, optocoupler OC1, MOSFET Q1, relay K1, diode D4, self-diagnostic current sensor CT1, ADC chip U9, varistor RV1, resistor R15, and capacitor C18. The TRIP_EN pin of the main control module drives the gate of MOSFET Q1 via optocoupler OC1. The TRIP_EN pin of the main control module is connected to resistors R3 and R4. The other end of resistor R3 is connected to the VCC power supply, and the other end of resistor R4 is connected to ground. The emitter of optocoupler OC1 is grounded, the source of MOSFET Q1 is grounded, and the drain of MOSFET Q1 is connected to the coil of relay K1. Diode D4 is connected in parallel across the coil of relay K1. The coil of relay K1 is connected to self-diagnostic current sensor CT1. The ground pin of self-diagnostic current sensor CT1 is connected to ground. Self-diagnostic current sensor CT1 is connected to ADC chip U9. The main control module is connected to ADC chip U9 via I2C bus. Varistor RV1 is connected in parallel across the contacts of relay K1. Resistor R15 and capacitor C18 are connected in series and then in parallel across the contacts of relay K1.

6. The IoT remote control electric energy meter circuit according to claim 1, wherein, The safety protection module includes: gas discharge tube G1, self-resetting fuse PTC1, TVS diode array, UART circuit, ferrite bead FB2, ESD protection chip, shell sensing electrode PAD, and voltage detector. The power input terminal is connected to the gas discharge tube G1, the gas discharge tube G1 is connected to the resettable fuse PTC1, the resettable fuse PTC1 is connected to the TVS diode array, the TVS diode array is connected to the internal power supply, the UART line is connected to the ESD protection chip through the series ferrite bead FB2, the outer casing sensing electrode PAD is connected to the voltage detector, and the voltage detector is connected to the interrupt pin of the main control module.

7. The IoT remote control electric energy meter circuit according to claim 4, wherein, The three-phase voltage detection module includes: resistors R5, R7, R8, R10, R11, and R13, an operational amplifier, a multiplexer, and a current transformer CT2; The live wire L1 is connected to one end of resistor R5. The other end of resistor R5 is connected to the operational amplifier and one end of resistor R7. The other end of resistor R7 is connected to ground. The live wire L2 is connected to one end of resistor R8. The other end of resistor R8 is connected to the operational amplifier and one end of resistor R10. The other end of resistor R10 is connected to ground. The live wire L3 is connected to one end of resistor R11. The other end of resistor R11 is connected to the operational amplifier and one end of resistor R13. The other end of resistor R13 is connected to ground. The operational amplifier is connected to the multiplexer. The multiplexer is connected to the ADC_IN interface of the main control module. The neutral wire is connected to the current transformer CT2. The current transformer CT2 is connected to the carrier chip.

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