A power meter with a low-power wake-up circuit

Abstract

This utility model discloses an energy meter with a low-power wake-up circuit, comprising: a main control module, a carrier communication module, a hierarchical wake-up circuit module, a wireless communication module, a pulse output module, a metering module, a trip control module, an infrared module, a clock wake-up circuit, and an indicator light module. The main control module is connected to the carrier communication module, the hierarchical wake-up circuit module, the pulse output module, the metering module, the trip control module, the infrared module, the clock wake-up circuit, and the indicator light module. The carrier communication module is connected to the hierarchical wake-up circuit module, and the hierarchical wake-up circuit module is connected to the wireless communication module. This energy meter achieves a balance between low power consumption and high accuracy. The hierarchical wake-up circuit reduces power consumption, metering accuracy reaches 0.2S level, communication is stable, tripping is rapid, and the multi-module collaboration improves reliability and energy management efficiency.

Description

Technical Field

[0001] This utility model belongs to the field of electricity meter technology, and relates to an electricity meter with a low-power wake-up circuit. Background Technology

[0002] With the advancement of smart grid construction and the increasing demands for refined energy management, electricity meters are being used more and more widely in power systems. Traditional electricity meters suffer from high power consumption during operation, especially during prolonged standby. Unnecessary power consumption not only wastes energy but also increases operating costs. Furthermore, traditional wake-up circuits suffer from untimely responses and insufficient accuracy, failing to meet the needs of real-time data acquisition and transmission. Signal interference during communication can also lead to false wake-ups. In addition, the metering accuracy, tripping control stability, and clock synchronization reliability of electricity meters face challenges. Therefore, it is necessary to design an electricity meter with low-power wake-up functionality. By optimizing the wake-up circuit structure and improving the performance of each functional module, energy saving, accurate metering, and reliable control can be achieved to meet the requirements of efficient and stable operation of modern smart grids. Summary of the Invention

[0003] To address the problems existing in the background technology, this utility model proposes an energy meter with a low-power wake-up circuit.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an energy meter with a low-power wake-up circuit, comprising: a main control module, a carrier communication module, a hierarchical wake-up circuit module, a wireless communication module, a pulse output module, a metering module, a trip control module, an infrared module, a clock wake-up circuit, and an indicator light module;

[0005] The main control module is connected to the carrier communication module, the hierarchical wake-up circuit module, the pulse output module, the metering module, the trip control module, the infrared module, the clock wake-up circuit, and the indicator light module. The carrier communication module is connected to the hierarchical wake-up circuit module, and the hierarchical wake-up circuit module is connected to the wireless communication module.

[0006] The hierarchical wake-up circuit module includes a carrier wake-up unit, a wireless wake-up unit, and a power control unit;

[0007] The carrier wake-up unit includes: diode D1, resistor R3, resistor R4, transistor Q3, capacitor C2, Schmitt trigger, diode D2, resistor R1, and capacitor C1;

[0008] The wireless wake-up unit includes: a comparator, a resistor R2, and a reference voltage source;

[0009] The power control unit includes: a driver chip, transistor Q1, and transistor Q2;

[0010] The RXD pin of the carrier communication module is connected to the anode of diode D1. The cathode of diode D1 is connected to the base of transistor Q3 via resistor R3. The collector of transistor Q3 is connected to the +5V power supply via resistor R4. The emitter of transistor Q3 is connected to one end of capacitor C2 and the input of a Schmitt trigger. The other end of capacitor C2 is connected to ground. The Schmitt trigger is connected to the cathode of diode D2. The anode of diode D2 is connected to ground. The Schmitt trigger is connected to one end of capacitor C1 via series resistor R1 and the IN1 pin of the driver chip. The other end of capacitor C1 is connected to ground. Wireless communication... The module's INT pin is connected to the non-inverting input of the comparator, the reference voltage source is connected to the inverting input of the comparator, the comparator's output is connected to the IN2 pin of the driver chip through a series resistor R2, the driver chip's OUT1 pin is connected to the gate of MOSFET Q1, the drain of MOSFET Q1 is connected to the +5V power supply, the source of MOSFET Q1 is connected to the VCC pin of the main control module, the driver chip's OUT2 pin is connected to the gate of MOSFET Q2, the drain of MOSFET Q2 is connected to the +3.3V power supply, and the source of MOSFET Q2 is connected to the VDD pin of the wireless communication module.

[0011] The power control unit also includes a leakage current suppression circuit, which includes: diode D3, diode D4, resistor R5, diode D6, and resistor R6.

[0012] The anode of diode D3 is connected to the gate of MOSFET Q1, the cathode of diode D4, and one end of resistor R5. The cathode of diode D3 is connected to ground. The source of MOSFET Q1 is connected to the anode of diode D4, the other end of resistor R5, and the VCC pin of the main control module. The anode of diode D5 is connected to the gate of MOSFET Q2, the cathode of diode D6, and one end of resistor R6. The cathode of diode D5 is connected to ground. The source of MOSFET Q2 is connected to the anode of diode D6, the other end of resistor R6, and the VDD pin of the wireless communication module.

[0013] The metering module includes: a current transformer, a resistor R7, a capacitor C3, a capacitor C4, a metering chip, a three-phase voltage input terminal, a resistor R8, a resistor R9, a resistor R10, and a capacitor C5.

[0014] A resistor R7 is connected in parallel across the secondary side of the current transformer. The two ends of resistor R7 are grounded via capacitors C3 and C4, respectively. The two ends of resistor R7 are connected to the IAP and IAN pins of the metering chip, respectively. The three-phase voltage input terminal is connected to one end of resistor R8. The other end of resistor R8 is connected in series with resistor R9. The other end of resistor R8 is also connected to the common terminal of resistors R9 and R10, and one end of capacitor C5. The common terminal of resistors R10 and C5 is grounded. The common terminal of resistors R8 and R9 is connected to the VAP pin of the metering chip. The common terminal of resistors R9 and R10 is connected to the VAN pin of the metering chip. The SPI interface of the metering chip is connected to the SPI bus of the main control module.

[0015] The trip control module includes: resistor R11, MOSFET Q3, MOSFET Q4, resistor R12, resistor R13, trip relay, and diode D7;

[0016] The PA1 pin of the main control module is connected to the gate of transistor Q5 through a series resistor R11. The drain of MOSFET Q5 is connected to the gate of MOSFET Q4. The sources of MOSFET Q5 and MOSFET Q4 are connected to ground. The drain of MOSFET Q4 is connected to one end of the coil of the trip relay through a series resistor R12. The other end of the coil of the trip relay is connected to the +12V power supply. Resistor R13 is connected in parallel across resistor R12. Diode D7 is connected in reverse parallel across the trip relay.

[0017] The clock wake-up circuit includes: resistor R14, real-time clock chip, crystal oscillator, and capacitor C6;

[0018] The INT pin of the real-time clock chip is connected to the hierarchical wake-up circuit module via a series resistor R14. The clock chip and the main control module's I... 2 The C bus is connected, and the VCC pin of the real-time clock chip is connected to ground through a series capacitor C6. The crystal oscillator is connected in parallel across the real-time clock chip.

[0019] Compared with existing technologies, this utility model has the following advantages: The energy meter achieves low-power operation through a hierarchical wake-up circuit module. The carrier wake-up unit and the wireless wake-up unit can work independently or collaboratively, accurately receiving external wake-up signals. After processing by a Schmitt trigger and comparator, the power control unit is triggered, effectively reducing standby power consumption. The leakage current suppression circuit further reduces MOSFET leakage current through a combination of diodes and resistors, improving energy saving. The metering module uses a current transformer and a voltage divider resistor network, combined with a high-precision metering chip, to ensure accurate and reliable energy data acquisition. The trip control module uses two-stage MOSFET drive to achieve stable control of the trip relay by the main control module; the configuration of resistors and diodes enhances circuit safety. The clock wake-up circuit, utilizing a real-time clock chip and crystal oscillator, provides precise timing functionality, ensuring accurate timed wake-up and data synchronization. The collaborative work of each module enables the energy meter to maintain high reliability in a low-power state, meeting the smart grid's requirements for energy saving, accurate metering, and stable communication. Attached Figure Description

[0020] Figure 1 This is a main block diagram of a power meter circuit with a low-power wake-up circuit according to the present invention.

[0021] Figure 2 This is a circuit connection diagram of the hierarchical wake-up circuit module of this utility model;

[0022] Figure 3 This is the circuit connection diagram of the leakage current suppression circuit of this utility model;

[0023] Figure 4 This is the circuit connection diagram of the metering module of this utility model;

[0024] Figure 5 This is the circuit connection diagram of the trip control module of this utility model;

[0025] Figure 6 This is the connection diagram of the clock wake-up circuit 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 1-6As shown, the technical solution adopted by this utility model is as follows: an energy meter with a low-power wake-up circuit, comprising: a main control module, a carrier communication module, a hierarchical wake-up circuit module, a wireless communication module, a pulse output module, a metering module, a trip control module, an infrared module, a clock wake-up circuit, and an indicator light module.

[0028] The main control module is connected to the carrier communication module, the hierarchical wake-up circuit module, the pulse output module, the metering module, the trip control module, the infrared module, the clock wake-up circuit, and the indicator light module. The carrier communication module is connected to the hierarchical wake-up circuit module, and the hierarchical wake-up circuit module is connected to the wireless communication module.

[0029] The main control module uses an STM32L476RG microcontroller to coordinate the operation of various modules, process metering data, communication protocols, and control logic. It supports low-power mode and can be woken up via RTC or external interrupt. The microcontroller has a built-in ADC for acquiring analog signals and a DAC for outputting control signals.

[0030] During normal operation, it communicates with the metering chip via SPI to obtain power data, and then uses I... 2 C synchronizes time with RTC. Upon receiving a wake-up signal, it wakes up from standby mode, initializes peripherals, and handles communication requests. It controls indicator lights, pulse output, and the trip module via GPIO.

[0031] The carrier communication module uses a carrier chip of model HPLC-SSC1699, which realizes data transmission through power lines, supports high-speed power line carrier protocol, and has automatic routing and signal strength adaptive adjustment functions.

[0032] When transmitting signals, the carrier communication module modulates the digital signal onto a 1.8–30MHz carrier wave, amplifies it, and then injects it into the power line through a coupling circuit. When receiving signals, the carrier communication module extracts the carrier signal from the power line, filters and demodulates it to restore the digital signal. Employing OFDM modulation technology, it boasts strong anti-interference capabilities and a transmission rate of up to 10Mbps.

[0033] The wireless communication module uses the CC2652RB wireless chip, supporting short-range wireless communication for local configuration and data transmission. It features a low-power design with a sleep current of <1μA.

[0034] When the wireless communication module receives an external wireless signal, it wakes up the INT pin, triggering a tiered wake-up circuit. It communicates with the main control module via SPI to transmit configuration commands or meter reading data. It supports Mesh network topologies and automatically extends the communication range via relay.

[0035] The pulse output module outputs power metering data in the form of optical pulses for verification or linkage with other devices. The main control module outputs pulse signals based on the accumulated power, which are then output to external terminals after optocoupler isolation. The optocoupler ensures electrical isolation between internal and external circuits, improving anti-interference capabilities.

[0036] The infrared module uses the TSOP4038 infrared transceiver, which supports close-range configuration and meter reading using infrared handheld terminals.

[0037] The indicator light module visually displays the operating status of the electricity meter, such as power supply, communication, and alarm. It supports flashing frequencies to indicate different operating conditions, such as communication speed.

[0038] The hierarchical wake-up circuit module includes a carrier wake-up unit, a wireless wake-up unit, and a power control unit.

[0039] The carrier wake-up unit includes: diode D1, resistor R3, resistor R4, transistor Q3, capacitor C2, Schmitt trigger, diode D2, resistor R1, and capacitor C1.

[0040] The wireless wake-up unit includes: a comparator, a resistor R2, and a reference voltage source.

[0041] The power control unit includes: a driver chip, transistor Q1, and transistor Q2.

[0042] The RXD pin of the carrier communication module is connected to the anode of diode D1. The cathode of diode D1 is connected to the base of transistor Q3 via resistor R3. The collector of transistor Q3 is connected to the +5V power supply via resistor R4. The emitter of transistor Q3 is connected to one end of capacitor C2 and the input of a Schmitt trigger. The other end of capacitor C2 is connected to ground. The Schmitt trigger is connected to the cathode of diode D2. The anode of diode D2 is connected to ground. The Schmitt trigger is connected to one end of capacitor C1 via series resistor R1 and the IN1 pin of the driver chip. The other end of capacitor C1 is connected to ground. Wireless communication... The module's INT pin is connected to the non-inverting input of the comparator, the reference voltage source is connected to the inverting input of the comparator, the comparator's output is connected to the IN2 pin of the driver chip through a series resistor R2, the driver chip's OUT1 pin is connected to the gate of MOSFET Q1, the drain of MOSFET Q1 is connected to the +5V power supply, the source of MOSFET Q1 is connected to the VCC pin of the main control module, the driver chip's OUT2 pin is connected to the gate of MOSFET Q2, the drain of MOSFET Q2 is connected to the +3.3V power supply, and the source of MOSFET Q2 is connected to the VDD pin of the wireless communication module.

[0043] The Schmitt trigger uses a 74HC14 to shape the waveform and enhance anti-interference capabilities. The comparator uses an LM393 to compare the wireless signal with a reference voltage and output a digital signal. The reference voltage source uses a TL431 to provide a stable reference voltage, ensuring accurate wake-up threshold. The driver chip uses a TC4420 to quickly drive MOSFETs Q1 and Q2, reducing switching losses.

[0044] The graded wake-up circuit module is the core component for the low-power operation of this energy meter. Through a three-level wake-up mechanism and power control strategy, it reduces standby power consumption to below 50μA. This module includes three units: carrier wake-up, wireless wake-up, and power control. The carrier wake-up unit rectifies the RXD signal of the carrier communication module through diode D1, and drives transistor Q3 to conduct after voltage division by resistors R3 and R4. This triggers a Schmitt trigger to shape the signal, and then outputs a stable wake-up signal to the IN1 pin of the driver chip through a delay circuit with resistor R1 and capacitor C1.

[0045] The wireless wake-up unit compares the INT signal from the wireless communication module with the 2.5V reference voltage provided by the reference voltage source in the comparator, and outputs a digital signal that is transmitted to the IN2 pin of the driver chip via R2.

[0046] The power control unit uses a driver chip to quickly switch between MOSFETs Q1 and Q2, enabling independent power supply control for the main control module and the wireless module.

[0047] The power control unit also includes a leakage current suppression circuit, which includes: diode D3, diode D4, resistor R5, diode D6, and resistor R6.

[0048] The anode of diode D3 is connected to the gate of MOSFET Q1, the cathode of diode D4, and one end of resistor R5. The cathode of diode D3 is connected to ground. The source of MOSFET Q1 is connected to the anode of diode D4, the other end of resistor R5, and the VCC pin of the main control module. The anode of diode D5 is connected to the gate of MOSFET Q2, the cathode of diode D6, and one end of resistor R6. The cathode of diode D5 is connected to ground. The source of MOSFET Q2 is connected to the anode of diode D6, the other end of resistor R6, and the VDD pin of the wireless communication module.

[0049] The leakage current suppression circuit completely eliminates leakage current in the MOSFET's off-state state through the coordinated operation of diodes and resistors. This circuit consists of two symmetrical structures: In the main control module's power path, when the driver chip OUT1 outputs a low level to turn off MOSFET Q1, diode D3 conducts, clamping the gate voltage of MOSFET Q1 to 0V. Simultaneously, diode D4 is reverse-biased, blocking the leakage path from the source of MOSFET Q1 to its gate through parasitic capacitance; resistor R5 provides a discharge channel for diode D4, ensuring a fast response.

[0050] In the power supply path of the wireless module, when the driver chip OUT2 outputs a low level to turn off the MOSFET Q2, diode D5 conducts to clamp the gate voltage of MOSFET Q2 to 0V. At the same time, diode D6 is reverse biased, blocking the leakage path from the source of MOSFET Q2 to the gate of MOSFET Q2 through parasitic capacitance. Resistor R6 provides a discharge channel for diode D6 to ensure fast response.

[0051] The metering module includes: a current transformer, a resistor R7, a capacitor C3, a capacitor C4, a metering chip, a three-phase voltage input terminal, a resistor R8, a resistor R9, a resistor R10, and a capacitor C5.

[0052] A resistor R7 is connected in parallel across the secondary side of the current transformer. The two ends of resistor R7 are grounded via capacitors C3 and C4, respectively. The two ends of resistor R7 are connected to the IAP and IAN pins of the metering chip, respectively. The three-phase voltage input terminal is connected to one end of resistor R8. The other end of resistor R8 is connected in series with resistor R9. The other end of resistor R8 is also connected to the common terminal of resistors R9 and R10, and one end of capacitor C5. The common terminal of resistors R10 and C5 is grounded. The common terminal of resistors R8 and R9 is connected to the VAP pin of the metering chip. The common terminal of resistors R9 and R10 is connected to the VAN pin of the metering chip. The SPI interface of the metering chip is connected to the SPI bus of the main control module.

[0053] The current transformer uses the LA125-P, rated at 5A, to convert high current into a low current signal. The metering chip is the ADE7758, providing high-precision energy metering and supporting SPI communication. The three-phase voltage input terminals are terminal blocks connected to the three-phase grid voltage.

[0054] The metering module achieves a metering accuracy of 0.2S through hardware redundancy design and digital calibration algorithms. The module adopts a current-voltage dual-channel sampling architecture. In the current measurement path, the current transformer converts the main circuit current into a secondary small current, which is then converted into a millivolt-level voltage signal by a high-precision sampling resistor R7. After high-frequency noise is filtered out by capacitors C3 and C4, the signal is connected to the IAP / IAN pin of the metering chip.

[0055] In the voltage measurement path, the three-phase voltage is attenuated to the measurable range of the chip through resistors R8, R9, and R10, while capacitor C5 filters out voltage fluctuations. The metering chip synchronously samples the voltage and current, calculates the instantaneous power through a digital multiplier, and accumulates the energy value.

[0056] The trip control module includes: resistor R11, MOSFET Q3, MOSFET Q4, resistor R12, resistor R13, trip relay, and diode D7.

[0057] The PA1 pin of the main control module is connected to the gate of transistor Q5 through a series resistor R11. The drain of MOSFET Q5 is connected to the gate of MOSFET Q4. The sources of MOSFET Q5 and MOSFET Q4 are connected to ground. The drain of MOSFET Q4 is connected to one end of the coil of the trip relay through a series resistor R12. The other end of the coil of the trip relay is connected to the +12V power supply. Resistor R13 is connected in parallel across resistor R12. Diode D7 is connected in reverse parallel across the trip relay.

[0058] The trip relay uses HF115F to control the on / off state of the circuit.

[0059] The trip control module ensures that the tripping action is completed within 10ms through a two-stage amplification drive and energy discharge circuit. The module adopts a redundant drive architecture: the control signal output from the PA1 pin of the main control module is current-limited by a 10kΩ resistor R11, which drives the S8050 transistor Q3 to conduct, grounding the gate of the IRF3205 power MOSFET Q4 and saturating it.

[0060] The +12V power supply drives the HF115F trip relay to engage via MOSFET Q4 and a 10Ω current-limiting resistor R12, cutting off the main circuit. A 100Ω shunt resistor R13 is connected in parallel with R12, shunting 70% of the current after the relay engages, reducing power consumption and extending contact life. A 1N4007 diode D7 connected in reverse parallel forms a freewheeling circuit, releasing the coil's stored energy at the moment the relay is de-energized, clamping the back electromotive force at 12.7V to protect the MOSFET from breakdown. This module supports overcurrent, overvoltage, and leakage protection modes, and can be configured via software to achieve instantaneous trip, definite-time, and inverse-time operating characteristics.

[0061] The clock wake-up circuit includes: resistor R14, real-time clock chip, crystal oscillator, and capacitor C6.

[0062] The INT pin of the real-time clock chip is connected to the hierarchical wake-up circuit module via a series resistor R14. The clock chip and the main control module's I... 2 The C bus is connected, and the VCC pin of the real-time clock chip is connected to ground through a series capacitor C6. The crystal oscillator is connected in parallel across the real-time clock chip.

[0063] The real-time clock chip uses the DS3231, a high-precision clock with a built-in temperature-compensated crystal oscillator, providing year, month, day, hour, minute, and second timing.

[0064] The crystal oscillator uses 32.768kHz to provide a precise frequency reference for the clock chip.

[0065] The clock wake-up circuit, through hardware redundancy design and temperature compensation algorithm, controls the annual timing error to within one minute. This circuit uses a high-precision real-time clock chip with a built-in temperature-compensated crystal oscillator and temperature sensor, and communicates via I...2 The C interface communicates with the main control module, providing precise timekeeping for year, month, day, hour, minute, and second. A crystal oscillator provides the reference frequency for the clock, and decoupling capacitor C6 ensures stable power supply. When the preset wake-up time is reached, the INT pin of the real-time clock chip outputs a low level, triggering the driver chip of the hierarchical wake-up circuit via a 10kΩ pull-up resistor R14, waking the main control module within 5ms. A dual-crystal backup mechanism automatically switches to the MCU's internal RC oscillator when the main crystal oscillator fails, ensuring continuous timing. A temperature compensation algorithm dynamically adjusts the crystal oscillator load capacitance based on built-in sensor data. This circuit supports multi-task timed wake-up and can simultaneously set up to 8 independent alarms. In the event of a power outage, the real-time clock chip automatically switches to built-in lithium battery power. (The last sentence appears to be incomplete and possibly refers to a different circuit.) 2 With its C interface, the main control module can also calibrate the real-time clock chip to achieve time synchronization with the main station system, providing a precise time reference for functions such as time-of-use electricity billing and demand cycle statistics.

[0066] This technical solution addresses the low-power, high-precision, and intelligent requirements of electricity meters by constructing a complete system with multiple collaborative modules. The main control module, centered on a low-power STM32L476RG microprocessor, coordinates the operation of various functional units, reducing standby current to below 2μA through sleep and wake-up strategies. The hierarchical wake-up circuit employs a triple-redundant wake-up mechanism of carrier, wireless, and clock. The carrier wake-up unit is sensitive to power line signals, the wireless wake-up unit supports Zigbee / Bluetooth multi-protocol access, and the clock wake-up circuit achieves precise timing wake-up. These three components work together to activate the electricity meter on demand during sleep mode, reducing unnecessary power consumption. The metering module, utilizing the ADE7758 chip and precision current transformer, achieves high-precision energy metering. The trip control module, through two-stage MOSFET drive and back EMF protection, ensures reliable power-off within 10ms and supports multiple protection modes and remote control. The carrier communication module achieves high-speed power line data transmission based on the HPLC protocol, the wireless communication module provides near-field configuration and Mesh networking capabilities, and the infrared module supports rapid meter reading via handheld terminals. The three-channel communication ensures the stability and flexibility of data interaction. The pulse output module outputs standard electrical pulses via optocoupler isolation for verification and linkage. The indicator light module uses color and frequency coding to intuitively display the device status. Through modular design and innovative circuit optimization, the overall solution enables the energy meter to meet the high-precision metering and remote control requirements of the smart grid while achieving an annual standby power consumption of <0.05kWh, significantly improving energy efficiency and equipment reliability.

[0067] 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 electric energy meter having a low power consumption wake-up circuit, characterized by, It includes: main control module, carrier communication module, hierarchical wake-up circuit module, wireless communication module, pulse output module, metering module, trip control module, infrared module, clock wake-up circuit, and indicator light module; The main control module is connected to the carrier communication module, the hierarchical wake-up circuit module, the pulse output module, the metering module, the trip control module, the infrared module, the clock wake-up circuit, and the indicator light module. The carrier communication module is connected to the hierarchical wake-up circuit module, and the hierarchical wake-up circuit module is connected to the wireless communication module.

2. The electric energy meter with low-power consumption wake-up circuit according to claim 1, characterized in that, The hierarchical wake-up circuit module includes a carrier wake-up unit, a wireless wake-up unit, and a power control unit; The carrier wake-up unit includes: diode D1, resistor R3, resistor R4, transistor Q3, capacitor C2, Schmitt trigger, diode D2, resistor R1, and capacitor C1; The wireless wake-up unit includes: a comparator, a resistor R2, and a reference voltage source; The power control unit includes: a driver chip, transistor Q1, and transistor Q2; The RXD pin of the carrier communication module is connected to the anode of diode D1. The cathode of diode D1 is connected to the base of transistor Q3 via resistor R3. The collector of transistor Q3 is connected to the +5V power supply via resistor R4. The emitter of transistor Q3 is connected to one end of capacitor C2 and the input of a Schmitt trigger. The other end of capacitor C2 is connected to ground. The Schmitt trigger is connected to the cathode of diode D2. The anode of diode D2 is connected to ground. The Schmitt trigger is connected to one end of capacitor C1 via series resistor R1 and the IN1 pin of the driver chip. The other end of capacitor C1 is connected to ground. Wireless communication... The module's INT pin is connected to the non-inverting input of the comparator, the reference voltage source is connected to the inverting input of the comparator, the comparator's output is connected to the IN2 pin of the driver chip through a series resistor R2, the driver chip's OUT1 pin is connected to the gate of MOSFET Q1, the drain of MOSFET Q1 is connected to the +5V power supply, the source of MOSFET Q1 is connected to the VCC pin of the main control module, the driver chip's OUT2 pin is connected to the gate of MOSFET Q2, the drain of MOSFET Q2 is connected to the +3.3V power supply, and the source of MOSFET Q2 is connected to the VDD pin of the wireless communication module.

3. The electric energy meter with low-power wake-up circuit according to claim 2, characterized in that, The power control unit also includes a leakage current suppression circuit, which includes: diode D3, diode D4, resistor R5, diode D6, and resistor R6. The anode of diode D3 is connected to the gate of MOSFET Q1, the cathode of diode D4, and one end of resistor R5. The cathode of diode D3 is connected to ground. The source of MOSFET Q1 is connected to the anode of diode D4, the other end of resistor R5, and the VCC pin of the main control module. The anode of diode D5 is connected to the gate of MOSFET Q2, the cathode of diode D6, and one end of resistor R6. The cathode of diode D5 is connected to ground. The source of MOSFET Q2 is connected to the anode of diode D6, the other end of resistor R6, and the VDD pin of the wireless communication module.

4. The electric energy meter having a low-power consumption wake-up circuit according to claim 1, characterized in that, The metering module includes: a current transformer, a resistor R7, a capacitor C3, a capacitor C4, a metering chip, a three-phase voltage input terminal, a resistor R8, a resistor R9, a resistor R10, and a capacitor C5. A resistor R7 is connected in parallel across the secondary side of the current transformer. The two ends of resistor R7 are grounded via capacitors C3 and C4, respectively. The two ends of resistor R7 are connected to the IAP and IAN pins of the metering chip, respectively. The three-phase voltage input terminal is connected to one end of resistor R8. The other end of resistor R8 is connected in series with resistor R9. The other end of resistor R8 is also connected to the common terminal of resistors R9 and R10, and one end of capacitor C5. The common terminal of resistors R10 and C5 is grounded. The common terminal of resistors R8 and R9 is connected to the VAP pin of the metering chip. The common terminal of resistors R9 and R10 is connected to the VAN pin of the metering chip. The SPI interface of the metering chip is connected to the SPI bus of the main control module.

5. The electric energy meter having a low power consumption wake-up circuit according to claim 1, characterized in that, The trip control module includes: resistor R11, MOSFET Q5, MOSFET Q4, resistor R12, resistor R13, trip relay, and diode D7; The PA1 pin of the main control module is connected to the gate of transistor Q5 through a series resistor R11. The drain of MOSFET Q5 is connected to the gate of MOSFET Q4. The sources of MOSFET Q5 and MOSFET Q4 are connected to ground. The drain of MOSFET Q4 is connected to one end of the coil of the trip relay through a series resistor R12. The other end of the coil of the trip relay is connected to the +12V power supply. Resistor R13 is connected in parallel across resistor R12. Diode D7 is connected in reverse parallel across the trip relay.

6. The electric energy meter having a low power consumption wake-up circuit according to claim 2, wherein, The clock wake-up circuit includes: resistor R14, real-time clock chip, crystal oscillator, and capacitor C6; The INT pin of the real-time clock chip is connected to the hierarchical wake-up circuit module via a series resistor R14. The clock chip and the main control module's I... 2 The C bus is connected, and the VCC pin of the real-time clock chip is connected to ground through a series capacitor C6. The crystal oscillator is connected in parallel across the real-time clock chip.

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