Self-opening and closing electric meter box

Abstract

The utility model discloses a kind of self-opening and closing electric power meter box, belong to electric meter box technical field, solve the electric meter box in use, internal strong current wire wiring is not standard, alternating current generates strong alternating magnetic field, penetrates metal component induction eddy current;Eddy current causes local heating of metal, causes energy loss, accelerates cable and element aging insulation breakdown, and strong magnetic field interference electronic electric energy meter and intelligent circuit breaker sampling circuit, cause the problem of inaccuracy of measurement or protection judgment error. Including box, and the state remote monitoring circuit being set in box, the state remote monitoring circuit includes clock source module, counter and addressing module, address coding and dual-tone multi-frequency signal generation module. The utility model is through time division multiple access cycle mechanism, temperature and magnetic field signal collected by each sensor are converted into specific audio frequency in turn, and after being mixed with dual-tone multi-frequency address coding signal representing identity recognition, it is transmitted to remote monitoring center through the voice channel of 4G network.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter box technology, and in particular to an automatic opening and closing electricity meter box. Background Technology

[0002] An electricity meter box is a specialized protective enclosure for housing electrical components such as electricity meters, circuit breakers, and terminals. Its core function is to protect metering and distribution components and ensure electrical safety. Its outer casing is typically made of rust-resistant cold-rolled steel or flame-retardant engineering plastics, with a protection rating often reaching IP30 or higher, suitable for indoor corridors, outdoor corners, and other similar locations. The internal layout is organized, supporting the installation of different meter sizes, facilitating meter reading and maintenance. It isolates the meter from dust, moisture, and accidental contact, preventing component damage or electric shock risks, and ensuring accurate electricity metering and stable power distribution.

[0003] During the use of the meter box, the internal high-current wires are not wired in a standardized manner. The alternating current generates a strong alternating magnetic field, which penetrates the metal parts and induces eddy currents. The eddy currents cause local heating of the metal, resulting in energy loss, accelerated aging of cables and components, and damage to insulation. In addition, the strong magnetic field interferes with the sampling circuit of electronic energy meters and smart circuit breakers, resulting in inaccurate measurement or protection judgment errors.

[0004] Therefore, a self-opening and closing power meter box is proposed to solve or alleviate the above problems. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a self-opening and closing power meter box.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A self-opening and closing power meter box includes a box body and a remote status monitoring circuit installed inside the box body. The remote status monitoring circuit includes a clock source module, a counter and addressing module, an address encoding and dual-tone multi-frequency (DTMF) signal generation module, an analog switch array and enable logic module, an analog adder and audio driver module, a voltage-controlled oscillator (VCO) array, a sensor signal conditioning module, and a fourth-generation mobile communication module. The signal output terminal of the clock source module is connected to the clock signal input terminal of the counter and addressing module. The address signal output terminal of the counter and addressing module is connected to the address signal input terminal of the address encoding and DTMF signal generation module and the address signal input terminal of the analog switch array and enable logic module. The address encoding and dual-tone multi-frequency signal generation module's dual-tone multi-frequency signal output terminal is connected to the analog adder and the first signal input terminal of the audio driver module. The sensor signal conditioning module's voltage signal output terminal is connected to the voltage control input terminal of the voltage-controlled oscillator array. The voltage-controlled oscillator array's sine wave signal output terminal is connected to the analog switch array and the enable logic module's signal input terminal. The analog switch array and the enable logic module's multiplexed signal output terminal is connected to the analog adder and the second signal input terminal of the audio driver module. The analog adder and the audio driver module's mixed audio signal output terminal is connected to the microphone signal input terminal of the fourth-generation mobile communication module.

[0008] Preferably, the clock source module includes an NE555 timer and a first capacitor. The reset terminal and positive power terminal of the NE555 timer are connected to a +5V power supply. The ground terminal of the NE555 timer is grounded. The trigger terminal and threshold terminal of the NE555 timer are connected to the first terminal of the first capacitor. The second terminal of the first capacitor is grounded. The discharge terminal of the NE555 timer is connected to the +5V power supply through a first resistor. The control voltage terminal of the NE555 timer is grounded through a second capacitor. The output terminal of the NE555 timer outputs a clock signal.

[0009] Preferably, the counter and addressing module includes a CD4020 binary counter and a CD4051 8-to-1 analog multiplexer. The positive power supply terminal of the CD4020 binary counter is connected to a +5V power supply, the negative power supply terminal of the CD4020 binary counter is grounded, the clock input terminal of the CD4020 binary counter receives a clock signal, and the fourth, fifth, and sixth stage output terminals of the CD4020 binary counter are respectively connected to the first, second, and third address input terminals of the CD4051 8-to-1 analog multiplexer.

[0010] Preferably, the address encoding and dual-tone multi-frequency (DTMF) signal generation module includes a CM8880 DTMF encoder. The positive power supply terminal of the CM8880 DTMF encoder is connected to a +5V power supply, and the negative power supply terminal of the CM8880 DTMF encoder is grounded. The first row input terminal, second row input terminal, third row input terminal, fourth row input terminal, first column input terminal, second column input terminal, third column input terminal, and fourth column input terminal of the CM8880 DTMF encoder are respectively grounded through pull-down resistors. The DTMF signal output terminal of the CM8880 DTMF encoder outputs a dual-tone multi-frequency (DTMF) signal.

[0011] Preferably, the sensor signal conditioning module includes a PT100 platinum resistance temperature sensor, a sampling resistor, a first OP07 operational amplifier, and an ACS712 Hall sensor. The first terminal of the PT100 platinum resistance temperature sensor is connected to a +5V power supply. The second terminal of the PT100 platinum resistance temperature sensor is connected to the first terminal of the sampling resistor, and the second terminal of the sampling resistor is grounded. The sampling node of the PT100 platinum resistance temperature sensor is connected to the non-inverting input terminal of the first OP07 operational amplifier. The inverting input terminal of the first OP07 operational amplifier is connected to the power supply ground through a second resistor. The inverting input terminal of the first OP07 operational amplifier is connected to the output terminal through a third resistor. The positive terminal of the ACS712 Hall sensor is connected to a +5V power supply. The ground terminal of the ACS712 Hall sensor is grounded. The voltage output terminal of the ACS712 Hall sensor outputs a sensing signal.

[0012] Preferably, the voltage-controlled oscillator array includes an ICL8038 precision waveform generator, the positive power supply terminal of the ICL8038 precision waveform generator is connected to a +12V power supply, the frequency adjustment terminal of the ICL8038 precision waveform generator is connected to a control voltage input, and the sine wave output terminal of the ICL8038 precision waveform generator outputs a sine wave signal.

[0013] Preferably, the analog switch array and enable logic module include a CD4066 quad bidirectional analog switch chip and a CD4081 quad two-input AND gate chip. The input terminals of each channel of the CD4066 quad bidirectional analog switch chip are respectively connected to the output signal of a voltage-controlled oscillator. The control terminals of each channel of the CD4066 quad bidirectional analog switch chip are connected to the output terminals of the CD4081 quad two-input AND gate chip. The input terminals of the CD4081 quad two-input AND gate chip are connected to the address signal.

[0014] Preferably, the analog adder and audio driver module includes a TL072 dual operational amplifier. The non-inverting input of the first operational amplifier in the TL072 dual operational amplifier is connected to a dual-tone multi-frequency (DTMF) signal input via a fourth resistor. The analog switch output signal is connected to the TL072 dual operational amplifier via a fifth resistor. The inverting input of the first operational amplifier in the TL072 dual operational amplifier is grounded via a sixth resistor. The inverting input of the first operational amplifier in the TL072 dual operational amplifier is connected to the output of the first operational amplifier via a seventh resistor. The audio signal is output from the output of the first operational amplifier in the TL072 dual operational amplifier.

[0015] Preferably, the fourth-generation mobile communication module includes an EC20 4G module, wherein the power supply pin of the EC20 4G module is connected to a +3.3V power supply, the ground pin of the EC20 4G module is grounded, the microphone input positive pin of the EC20 4G module is connected to an audio signal input, and the microphone input negative pin of the EC20 4G module is grounded.

[0016] This utility model has the following beneficial effects:

[0017] This invention uses a time-division multiple access (TDMA) cyclic mechanism to sequentially convert the temperature and magnetic field signals collected by each sensor into specific audio frequencies, mix them with dual-tone multi-frequency (DTMF) address codes representing identification, and then transmit them to a remote monitoring center through the voice channel of a 4G network. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a structural block diagram of the remote status monitoring circuit in this utility model.

[0021] In the diagram: 1. Cabinet; 2. Clock source module; 3. Counter and addressing module; 4. Address encoding and dual-tone multi-frequency signal generation module; 5. Analog switch array and enable logic module; 6. Analog adder and audio driver module; 7. Voltage-controlled oscillator array; 8. Sensor signal conditioning module; 9. Fourth-generation mobile communication module. Detailed Implementation

[0022] 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, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this utility model, it should be understood that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0026] Furthermore, the terms "first," "second," and "third" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0027] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] A self-opening and closing power meter box, such as Figure 1 and Figure 2As shown, the system includes a housing 1 and a remote status monitoring circuit housed within the housing 1. The remote status monitoring circuit includes a clock source module 2, a counter and addressing module 3, an address encoding and dual-tone multi-frequency (DTMF) signal generation module 4, an analog switch array and enable logic module 5, an analog adder and audio driver module 6, a voltage-controlled oscillator array 7, a sensor signal conditioning module 8, and a fourth-generation mobile communication module 9. The signal output of the clock source module 2 is connected to the clock signal input of the counter and addressing module 3. The address signal output of the counter and addressing module 3 is connected to the address signal input of the address encoding and DTMF signal generation module 4 and the address signal input of the analog switch array and enable logic module 5. The signal input terminal, the dual-tone multi-frequency signal output terminal of the address encoding and dual-tone multi-frequency signal generation module 4 is connected to the first signal input terminal of the analog adder and the audio driver module 6, the voltage signal output terminal of the sensor signal conditioning module 8 is connected to the voltage control input terminal of the voltage-controlled oscillator array 7, the sine wave signal output terminal of the voltage-controlled oscillator array 7 is connected to the signal input terminal of the analog switch array and the enable logic module 5, the multiplexed signal output terminal of the analog switch array and the enable logic module 5 is connected to the second signal input terminal of the analog adder and the audio driver module 6, and the mixed audio signal output terminal of the analog adder and the audio driver module 6 is connected to the microphone signal input terminal of the fourth-generation mobile communication module 9.

[0029] Clock source module 2 includes an NE555 timer and a first capacitor. The reset terminal and positive power terminal of the NE555 timer are connected to a +5V power supply. The ground terminal of the NE555 timer is grounded. The trigger terminal and threshold terminal of the NE555 timer are connected to the first terminal of the first capacitor. The second terminal of the first capacitor is grounded. The discharge terminal of the NE555 timer is connected to a +5V power supply through a first resistor. The control voltage terminal of the NE555 timer is grounded through a second capacitor. The output terminal of the NE555 timer outputs a clock signal.

[0030] The counter and addressing module 3 includes a CD4020 binary counter and a CD4051 8-to-1 analog multiplexer. The positive power supply terminal of the CD4020 binary counter is connected to a +5V power supply, and the negative power supply terminal of the CD4020 binary counter is grounded. The clock input terminal of the CD4020 binary counter receives a clock signal. The fourth, fifth, and sixth stage output terminals of the CD4020 binary counter are respectively connected to the first, second, and third address input terminals of the CD4051 8-to-1 analog multiplexer.

[0031] Address encoding and dual-tone multi-frequency signal generation module 4 includes a CM8880 dual-tone multi-frequency encoder. The positive power supply terminal of the CM8880 dual-tone multi-frequency encoder is connected to a +5V power supply, and the negative power supply terminal of the CM8880 dual-tone multi-frequency encoder is grounded. The first row input terminal, second row input terminal, third row input terminal, fourth row input terminal, first column input terminal, second column input terminal, third column input terminal, and fourth column input terminal of the CM8880 dual-tone multi-frequency encoder are grounded through pull-down resistors. The dual-tone multi-frequency signal output terminal of the CM8880 dual-tone multi-frequency encoder outputs a dual-tone multi-frequency signal.

[0032] The sensor signal conditioning module 8 includes a PT100 platinum resistance temperature sensor, a sampling resistor, a first OP07 operational amplifier, and an ACS712 Hall sensor. The first terminal of the PT100 platinum resistance temperature sensor is connected to a +5V power supply. The second terminal of the PT100 platinum resistance temperature sensor is connected to the first terminal of the sampling resistor, and the second terminal of the sampling resistor is grounded. The sampling node of the PT100 platinum resistance temperature sensor is connected to the non-inverting input terminal of the first OP07 operational amplifier. The inverting input terminal of the first OP07 operational amplifier is connected to the power supply ground through a second resistor. The inverting input terminal of the first OP07 operational amplifier is connected to the output terminal through a third resistor. The positive terminal of the ACS712 Hall sensor is connected to a +5V power supply. The ground terminal of the ACS712 Hall sensor is grounded. The voltage output terminal of the ACS712 Hall sensor outputs a sensing signal.

[0033] The voltage-controlled oscillator array 7 includes an ICL8038 precision waveform generator. The positive power supply terminal of the ICL8038 precision waveform generator is connected to a +12V power supply, the frequency adjustment terminal of the ICL8038 precision waveform generator is connected to a control voltage input, and the sine wave output terminal of the ICL8038 precision waveform generator outputs a sine wave signal.

[0034] The analog switch array and enable logic module 5 includes a CD4066 quad bidirectional analog switch chip and a CD4081 quad two-input AND gate chip. The input terminals of each channel of the CD4066 quad bidirectional analog switch chip are connected to the output signal of the voltage-controlled oscillator, the control terminals of each channel of the CD4066 quad bidirectional analog switch chip are connected to the output terminal of the CD4081 quad two-input AND gate chip, and the input terminals of the CD4081 quad two-input AND gate chip are connected to the address signal.

[0035] The analog adder and audio driver module 6 includes a TL072 dual operational amplifier. In the TL072 dual operational amplifier, the non-inverting input of the first operational amplifier is connected to the dual-tone multi-frequency signal input through a fourth resistor. The TL072 dual operational amplifier is connected to the analog switch output signal through a fifth resistor. The inverting input of the first operational amplifier is grounded through a sixth resistor. The inverting input of the first operational amplifier is connected to the output of the first operational amplifier through a seventh resistor. The output of the first operational amplifier in the TL072 dual operational amplifier outputs an audio signal.

[0036] The fourth-generation mobile communication module 9 includes the EC20 4G module. The power supply pin of the EC20 4G module is connected to a +3.3V power supply, the ground pin of the EC20 4G module is grounded, the microphone input positive pin of the EC20 4G module is connected to the audio signal input, and the microphone input negative pin of the EC20 4G module is grounded.

[0037] When the remote status monitoring circuit in enclosure 1 is working, the NE555 timer in clock source module 2 starts generating stable low-frequency clock pulses. This pulse signal is directly fed into the clock input of the counter and the CD4020 binary counter in addressing module 3, driving it to start cyclic counting. The specific output of the CD4020 counter continuously outputs a three-bit binary address code in a cyclic manner. These three address lines act as the "command center" of the system, being synchronously transmitted to three key parts.

[0038] First, the address input of the CD4051 8-to-1 analog multiplexer is used for channel selection.

[0039] Secondly, the column encoding input terminal of the CM8880 dual-tone multi-frequency encoder is used to determine the address identifier that needs to be sent.

[0040] Thirdly, the input terminals of the CD4081 quad-input AND gate chip in the analog switch array and enable logic module 5 are used to generate the corresponding channel selection signals.

[0041] At the beginning of each counting cycle, the CM8880 dual-tone multi-frequency encoder generates a corresponding dual-tone multi-frequency signal composed of two specific frequency audio signals superimposed according to the received column address encoding. This signal represents the address of the sensor channel currently reporting data. This signal is sent through its signal output terminal to the non-inverting input terminal of the analog adder and the TL072 dual operational amplifier in the audio driver module 6 via a resistor.

[0042] Meanwhile, sensors located at different key positions within the meter box 1, such as the PT100 platinum resistance temperature sensor and the ACS712 Hall sensor, continuously monitor the temperature changes and the surrounding magnetic field strength of the box 1.

[0043] The first OP07 operational amplifier in the sensor signal conditioning module 8 converts these physical quantities into proportional and precise voltage signals.

[0044] These voltage signals are respectively sent to the frequency control terminals of each ICL8038 precision waveform generator in the corresponding voltage-controlled oscillator array 7.

[0045] Each ICL8038 precision waveform generator linearly converts the input voltage signal into a sinusoidal audio signal of a specific frequency, the frequency of which faithfully reflects the magnitude of the measured physical quantity. These sinusoidal signals, representing real-time data, are then fed into the individual channel inputs of the CD4066 quad bidirectional analog switch chips in the analog switch array.

[0046] At this time, the channel selection signal generated by the CD4081 quad 2-input AND gate chip according to the address code arrives at the control terminal of each channel of the CD4081 quad 2-input AND gate chip, thus uniquely selecting a corresponding sensor channel within this time slice.

[0047] The selected channel sends the sinusoidal data signal generated by its VCO to the analog adder, where it is analog-mixed with the previously arrived DTMF address code signal.

[0048] The mixed composite audio signal, after being buffered and driven by the TL072 operational amplifier, is directly fed into the positive input pin of the 4G communication module's microphone via a coupling capacitor. The EC20 4G module, acting as a transparent audio transmission channel, continuously transmits the received analog audio signal to a remote monitoring center server via the mobile network in the form of a voice call.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A self-opening and closing power meter box, characterized in that, The system includes a housing (1) and a remote status monitoring circuit installed inside the housing (1). The remote status monitoring circuit includes a clock source module (2), a counter and addressing module (3), an address encoding and dual-tone multi-frequency signal generation module (4), an analog switch array and enable logic module (5), an analog adder and audio driver module (6), a voltage-controlled oscillator array (7), a sensor signal conditioning module (8), and a fourth-generation mobile communication module (9). The signal output terminal of the clock source module (2) is connected to the clock signal input terminal of the counter and addressing module (3). The address signal output terminal of the counter and addressing module (3) is connected to the address signal input terminal of the address encoding and dual-tone multi-frequency signal generation module (4) and the ground of the analog switch array and enable logic module (5). The address signal input terminal, the dual-tone multi-frequency signal output terminal of the address encoding and dual-tone multi-frequency signal generation module (4) is connected to the first signal input terminal of the analog adder and the audio driver module (6), the voltage signal output terminal of the sensor signal conditioning module (8) is connected to the voltage control input terminal of the voltage controlled oscillator array (7), the sine wave signal output terminal of the voltage controlled oscillator array (7) is connected to the signal input terminal of the analog switch array and the enable logic module (5), the multiplexed signal output terminal of the analog switch array and the enable logic module (5) is connected to the second signal input terminal of the analog adder and the audio driver module (6), and the mixed audio signal output terminal of the analog adder and the audio driver module (6) is connected to the microphone signal input terminal of the fourth generation mobile communication module (9).

2. The self-opening and closing power meter box according to claim 1, characterized in that, The clock source module (2) includes an NE555 timer and a first capacitor. The reset terminal and the positive terminal of the NE555 timer are connected to a +5V power supply. The ground terminal of the NE555 timer is grounded. The trigger terminal and the threshold terminal of the NE555 timer are connected to the first terminal of the first capacitor. The second terminal of the first capacitor is grounded. The discharge terminal of the NE555 timer is connected to a +5V power supply through a first resistor. The control voltage terminal of the NE555 timer is grounded through a second capacitor. The output terminal of the NE555 timer outputs a clock signal.

3. The self-opening and closing power meter box according to claim 1, characterized in that, The counter and addressing module (3) includes a CD4020 binary counter and a CD4051 8-to-1 analog multiplexer. The positive power supply terminal of the CD4020 binary counter is connected to a +5V power supply, the negative power supply terminal of the CD4020 binary counter is grounded, the clock input terminal of the CD4020 binary counter receives a clock signal, and the fourth, fifth, and sixth stage output terminals of the CD4020 binary counter are respectively connected to the first, second, and third address input terminals of the CD4051 8-to-1 analog multiplexer.

4. The self-opening and closing power meter box according to claim 1, characterized in that, The address encoding and dual-tone multi-frequency signal generation module (4) includes a CM8880 dual-tone multi-frequency encoder. The positive power supply terminal of the CM8880 dual-tone multi-frequency encoder is connected to a +5V power supply, and the negative power supply terminal of the CM8880 dual-tone multi-frequency encoder is grounded. The first row input terminal, the second row input terminal, the third row input terminal, the fourth row input terminal, the first column input terminal, the second column input terminal, the third column input terminal, and the fourth column input terminal of the CM8880 dual-tone multi-frequency encoder are grounded through pull-down resistors. The dual-tone multi-frequency signal output terminal of the CM8880 dual-tone multi-frequency encoder outputs a dual-tone multi-frequency signal.

5. A self-opening and closing power meter box according to claim 1, characterized in that, The sensor signal conditioning module (8) includes a PT100 platinum resistance temperature sensor, a sampling resistor, a first OP07 operational amplifier, and an ACS712 Hall sensor. The first end of the PT100 platinum resistance temperature sensor is connected to a +5V power supply. The second end of the PT100 platinum resistance temperature sensor is connected to the first end of the sampling resistor. The second end of the sampling resistor is grounded. The sampling node of the PT100 platinum resistance temperature sensor is connected to the non-inverting input of the first OP07 operational amplifier. The inverting input of the first OP07 operational amplifier is connected to the power supply ground through a second resistor. The inverting input of the first OP07 operational amplifier is connected to the output terminal through a third resistor. The positive power supply terminal of the ACS712 Hall sensor is connected to a +5V power supply. The ground terminal of the ACS712 Hall sensor is grounded. The voltage output terminal of the ACS712 Hall sensor outputs a sensing signal.

6. The self-opening and closing power meter box according to claim 1, characterized in that, The voltage-controlled oscillator array (7) includes an ICL8038 precision waveform generator. The positive power supply terminal of the ICL8038 precision waveform generator is connected to a +12V power supply. The frequency adjustment terminal of the ICL8038 precision waveform generator is connected to a control voltage input. The sine wave output terminal of the ICL8038 precision waveform generator outputs a sine wave signal.

7. A self-opening and closing power meter box according to claim 1, characterized in that, The analog switch array and enable logic module (5) includes a CD4066 quad bidirectional analog switch chip and a CD4081 quad two-input AND gate chip. The input terminals of each channel of the CD4066 quad bidirectional analog switch chip are connected to the output signal of the voltage-controlled oscillator. The control terminals of each channel of the CD4066 quad bidirectional analog switch chip are connected to the output terminal of the CD4081 quad two-input AND gate chip. The input terminals of the CD4081 quad two-input AND gate chip are connected to the address signal.

8. A self-opening and closing power meter box according to claim 1, characterized in that, The analog adder and audio driver module (6) includes a TL072 dual operational amplifier. The non-inverting input terminal of the first operational amplifier in the TL072 dual operational amplifier is connected to the dual-tone multi-frequency signal input through a fourth resistor. The analog switch output signal is connected to the TL072 dual operational amplifier through a fifth resistor. The inverting input terminal of the first operational amplifier in the TL072 dual operational amplifier is grounded through a sixth resistor. The inverting input terminal of the first operational amplifier in the TL072 dual operational amplifier is connected to the output terminal of the first operational amplifier through a seventh resistor. The audio signal is output from the output terminal of the first operational amplifier in the TL072 dual operational amplifier.

9. A self-opening and closing power meter box according to claim 1, characterized in that, The fourth-generation mobile communication module (9) includes an EC20 type 4G module. The power supply pin of the EC20 type 4G module is connected to a +3.3V power supply. The ground pin of the EC20 type 4G module is grounded. The microphone input positive pin of the EC20 type 4G module is connected to an audio signal input. The microphone input negative pin of the EC20 type 4G module is grounded.

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