An emergency power supply system for smart gas meters

Abstract

The utility model relates to an emergency power supply system for a smart gas meter. The system is characterized in that it includes a smart gas meter and an emergency power supply device. When the smart gas meter is in a low voltage state, an external emergency power supply device can be selected to provide emergency power supply for the smart gas meter. When the two are reliably connected, they need to communicate. After the two parties communicate, the external emergency power supply device provides the smart gas meter with the stable voltage required by the smart gas meter, and the smart gas meter accesses the power supply of the emergency power supply device through its internal power switching module. When the smart gas meter no longer needs the support of the external emergency power supply device, the smart gas meter timely interrupts the power supply of the external emergency power supply device through the communication of the security authentication module 1 and the voltage switching of the power switching module, and switches to its own power supply, so as to ensure that the smart gas meter can obtain electricity in time in an emergency, ensure the normal operation of the equipment, minimize the downtime, and improve the user experience and safety.

Description

Technical Field

[0001] The utility model relates to an emergency power supply system of an intelligent gas meter. Background Art

[0002] With the development of technology, smart gas meters have been widely used in homes and commercial places to measure and monitor gas usage. These smart gas meters are usually powered by batteries. When the battery power is low, the battery needs to be replaced to ensure the normal operation of the gas meter. However, with the upgrade and development of smart gas meters, the power supply batteries of smart gas meters on the market are diversified, and the working voltage points are also different. Therefore, the battery replacement process of some smart gas meters requires professional after-sales maintenance personnel to replace on-site, which undoubtedly increases the timeliness of battery replacement for smart gas meters.

[0003] If the smart gas meter is in a low battery state and the battery is not replaced in time, it will not work properly, thus interrupting the gas supply. 1) In scientific research, laboratories and innovation fields, such as high temperature experiments, catalyst reactions or gas analysis, the gas meter needs to work continuously, and the gas supply will not be affected by the valve being closed due to battery exhaustion. 2) In places where power supply is difficult, such as temporary construction sites or construction sites, gas is the main source of energy. 3) In the daily use of users, gas is one of the energy sources required for residents to cook, heat and other lives. Therefore, the timely replacement of the power supply of the smart gas meter ensures the normal operation of the smart gas meter. Otherwise, it will directly affect the normal operation of construction equipment, heating or gas furnaces on the construction site, affect the living standards of residents, and directly affect the experimental results in scientific research, wasting experimental resources and time. Utility Model Content

[0004] In view of the problems existing in the prior art, the purpose of the utility model is to provide a technical solution for an emergency power supply system of an intelligent gas meter.

[0005] The emergency power supply system of the intelligent gas meter is characterized in that it includes an intelligent gas meter and an emergency power supply device, the intelligent gas meter includes an intelligent gas meter controller, a human-computer interaction module 1, a power switching module, a storage module, a sampling and metering module, a valve control module, a power detection module, an external power protection module, a safety authentication communication module 1, a second channel module and a remote communication module, and the intelligent gas meter controller is respectively connected to the human-computer interaction module 1, the power switching module, the storage module, the sampling and metering module, the valve control module, the power detection module, the external power protection module, the safety authentication communication module 1, the second channel module and the remote communication module; the emergency power supply device includes an emergency power supply, an emergency power supply device controller, an output power protection module, a power management module, a safety authentication communication module 2 and a human-computer interaction module 2, and the emergency power supply device controller is respectively connected to the output power protection module, the power management module, the safety authentication communication module 2 and the human-computer interaction module 2; the intelligent gas meter and the emergency power supply device are connected by connecting lines, and the connecting lines are respectively the power connection line of the emergency power supply device, the connection detection line of the emergency power supply device and the communication line of the safety communication.

[0006] The emergency power supply system of the smart gas meter is characterized by:

[0007] Smart gas meter controller: controls and coordinates the modules in the smart gas meter. After the smart gas meter is powered on normally, the smart gas meter controller adopts low power consumption working mode.

[0008] Power supply detection module: It contains 2-channel power supply detection circuits, which can detect the power supply voltage of the smart gas meter itself or the input power supply voltage of the external emergency power supply device by switching the channels of the power supply detection circuit, so as to detect, control and convert the power input to the smart gas meter, ensure the normal operation of each module and component in the smart gas meter system, and monitor the power supply and power status of the smart gas meter in real time;

[0009] Human-computer interaction module 1: includes a display screen, indicator lights and buttons. The display screen displays the working status and information of the smart gas meter; the indicator lights serve as prompts; the smart gas meter is triggered to open the valve and the screen is turned to display relevant information of the smart gas meter by pressing buttons;

[0010] Sampling and metering module: real-time sampling and metering of gas usage flowing through the smart gas meter;

[0011] Storage module: used to store relevant parameters and working information of smart gas meters;

[0012] Valve control module: completes related valve opening and closing operations according to the instructions of the smart gas meter controller;

[0013] Second channel module: As the second channel for information interaction of smart gas meters, production and after-sales maintenance personnel use this module to read or set relevant information and status of smart gas meters;

[0014] Remote communication module: realizes remote communication and control of smart gas meters. Smart gas meters can upload meter information and status or abnormalities to the control background in real time or in real time, and inform relevant managers in time. Managers can realize remote control and remote recharge through this module;

[0015] Power switching module: a channel for the smart gas meter to select the power source. The smart gas meter can choose whether to connect to an external emergency power supply device through the power switching circuit of the power switching module;

[0016] External power supply protection module: The smart gas meter can confirm whether the external emergency power supply device is connected to the smart gas meter by detecting the connection line level status in the external power supply protection module;

[0017] Safety authentication communication module 1: used to realize communication authentication and data exchange with external emergency power supply equipment.

[0018] The emergency power supply system of the intelligent gas meter is characterized in that the power switching circuit is as follows: Pin 2 of the output power interface DB1 of the external emergency power supply device is the input voltage VBB, and Pin 1 of the output power interface DB1 of the external emergency power supply device is grounded; the input voltage VBB is connected to GND after passing through the voltage regulator diode Z4, and at the same time, the input voltage VBB is divided into two paths after passing through the diode D1, one path is connected to the gate of the MOS tube Q18 after passing through the current limiting resistor R29, and the other path is directly connected to the drain of the MOS tube Q18, the source of the MOS tube Q18 is the output voltage VCC, and the output voltage VCC is grounded after passing through the decoupling capacitor C1; AUTO_MC is the control port of the intelligent gas meter controller module, the control port AUTO_MC is connected to the gate of the MOS tube Q21 after passing through the current limiting resistor R30, and at the same time, the control port AUTO_MC is grounded after passing through the pull-down resistor R91, the source of the MOS tube Q21 is connected to GND, and the drain of the MOS tube Q21 is connected to the drain of the MOS tube Q18.

[0019] The emergency power supply system of the smart gas meter is characterized by:

[0020] Emergency power supply equipment controller: controls and coordinates each module in the emergency power supply equipment;

[0021] Human-computer interaction module 2: It includes a display screen, indicator lights and buttons. The display screen displays the working status and information of the emergency power supply equipment; the indicator lights serve as prompts; the buttons are used to trigger the screen to display relevant information of the emergency power supply equipment;

[0022] Output power protection module: corresponds to the external power protection module;

[0023] Power management module: It can be charged by mains electricity or solar energy, and store the energy of input power as its own electric energy to the greatest extent; the voltage conversion of the power management module can meet the voltage requirements of each module inside the emergency power supply equipment to achieve normal operation, and can convert and output different voltages;

[0024] Security authentication communication module 2: used to realize communication authentication and data exchange with external electrical equipment.

[0025] The emergency power supply system of the smart gas meter is characterized in that the emergency power supply equipment can be charged using municipal electricity or solar energy.

[0026] The emergency power supply system of the intelligent gas meter is characterized in that the power management module can also monitor the output current and voltage, and automatically cut off the power output when an overload or short circuit is detected.

[0027] Advantages of the utility model:

[0028] 1. Safety: After the smart gas meter and the emergency power supply device are reliably connected through the buckle, the smart gas meter and the emergency power supply device perform communication authentication. After the communication is successful, the emergency power supply device can supply power to the smart gas meter, and the smart gas meter can switch to the external emergency power supply device power supply working mode through the internal power switching module; when the voltage of the smart gas meter itself returns to normal, the smart gas meter can interrupt the power supply of the external emergency power supply device through the power switching module and switch to the power supply working mode using the smart gas meter's own power supply. This realizes the reliable switching selection of the power supply, ensures the security and reliability of the interaction of security authentication information, and also ensures the safety and reliability of the power consumption of electrical equipment.

[0029] 2. Flexibility: Emergency power supply equipment can be charged by mains electricity or solar energy. The voltage conversion can not only meet the voltage requirements of each module inside the emergency power supply equipment to achieve normal operation, but also convert different voltage points for stable output to meet the different voltage requirements of external power equipment. Smart gas meters can send the required power supply voltage information to emergency power supply equipment according to actual needs. In this way, emergency power supply equipment can be adjusted according to the needs of smart gas meters to ensure appropriate power support. This flexibility can adapt to smart gas meters of different models and different needs.

[0030] 3. Reliability: When the smart gas meter encounters a low voltage situation, it uses the voltage of the emergency power supply equipment to work, which can ensure that the smart gas meter can obtain power support in time in an emergency, ensure the normal operation of the equipment and minimize downtime, and improve user experience and safety. While the smart gas meter is working with the power of the external emergency power supply equipment, it will periodically inform the user or after-sales personnel through the human-computer interaction module 1 or the remote module that the smart gas meter battery needs to be changed. In order to ensure the working reliability of the smart gas meter and the emergency needs of the emergency power supply equipment, if the smart gas meter has not changed the battery after using the emergency power supply equipment for a period of time, the smart gas meter will interrupt the power supply of the external emergency power supply equipment through the power switching module until the gas user or after-sales maintenance personnel replace the new battery of the smart gas meter. The meter resumes normal operation, further ensuring the stability and reliability of the smart gas meter and the emergency power supply equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural diagram of the utility model intelligent gas meter;

[0032] Figure 2 This is a structural diagram of the emergency power supply equipment of the utility model;

[0033] Figure 3 This is a circuit schematic diagram of the power switching module in the intelligent gas meter of the utility model. DETAILED DESCRIPTION

[0034] The utility model is further described below in conjunction with the accompanying drawings:

[0035] An emergency power supply system for an intelligent gas meter comprises an intelligent gas meter and an emergency power supply device that cooperate with each other.

[0036] like Figure 1 As shown: the smart gas meter includes: a smart gas meter controller, a human-computer interaction module 1, a power switching module, a storage module, a sampling and metering module, a valve control module, a power detection module, an external power protection module, a safety authentication communication module 1, a second channel module and a remote communication module.

[0037] Smart gas meter controller: This module is the core of the smart gas meter, controlling and coordinating the various modules in the smart gas meter; after the smart gas meter is powered on normally, the smart gas meter controller adopts a low-power working mode.

[0038] Power supply detection module: an important module to ensure the normal operation of the smart gas meter. It contains a 2-channel power supply detection circuit, which can detect the power supply voltage of the smart gas meter itself or the input power supply voltage of the external emergency power supply device by switching the detection circuit channel. It can detect, control and convert the power input to the smart gas meter, ensure the normal operation of each module and component in the smart gas meter system, and monitor the power supply and power status of the smart gas meter in real time.

[0039] Human-computer interaction module 1: includes display screen, indicator light, button and other modules. The display screen displays some working status and information of the smart gas meter; the indicator light can serve as a prompt; the button can be used to trigger the smart gas meter to open the valve and flip the screen to display relevant information of the smart gas meter.

[0040] Sampling and metering module: real-time sampling and metering of gas usage flowing through the gas meter, is an important module for statistics and billing.

[0041] Storage module: used to store relevant parameters and working information of the smart gas meter, such as metering sampling values, abnormal information, etc.

[0042] Valve control module: completes related valve opening and closing operations according to the instructions of the smart gas meter controller; determines the on and off of gas, ensuring the safety of users' gas use.

[0043] Second channel module: As the second channel for information interaction of smart gas meters, production and after-sales maintenance personnel can use this module to read or set relevant information and status of smart gas meters; this channel can select infrared, Bluetooth or serial port communication methods according to actual product requirements.

[0044] Remote communication module: The main module for smart gas meters to achieve remote communication and control. Smart gas meters can upload meter information and status or abnormalities to the control background in real time or at a scheduled time, and inform relevant managers in time. Managers can use this module to achieve remote control, remote recharge and other operations, thus solving the huge manpower and material costs generated by on-site meter reading.

[0045] Power switching module: The power switching module is used for the smart gas meter to select the channel for the power supply source.

[0046] like Figure 3As shown: DB1 is the output power interface of the external emergency power supply device. When the external emergency power supply device is connected to the smart gas meter, VBB is the voltage input to the smart gas meter by the external emergency power supply device. The input voltage VBB is connected to GND after passing through the voltage regulator diode Z4. At the same time, the input voltage VBB is divided into two paths after passing through the anti-reverse current protection of the diode D1 with unidirectional conduction characteristics. One path is connected to the gate of the MOS tube Q18 after the current limiting resistor R29; the other path is directly connected to the drain of the MOS tube Q18; the source of the MOS tube Q18 is the output voltage VCC; the output voltage VCC is grounded after filtering the high-frequency noise through the decoupling capacitor C1. AUTO_MC is the control port of the smart gas meter controller module. The control port AUTO_MC is connected to the gate of the MOS tube Q21 after passing through the current limiting resistor R30. At the same time, the control port AUTO_MC is grounded after passing through the pull-down resistor R91, and the source of the MOS tube Q21 is connected to GND. The drain of the MOS tube Q21 is connected to the drain of the MOS tube Q18.

[0047] When the external emergency power supply device is input to the smart gas meter through the DB1 port, the input voltage VBB is directly connected to the drain of the MOS tube Q18 after passing through the diode D1, and is connected to the gate of the MOS tube Q18 after connecting to the current limiting resistor R29; when the smart gas meter controller module controls the AUTO_MC control port to output a low level, the gate of the MOS tube Q21 is a low level, the source of the MOS tube Q21 is connected to GND, and the MOS tube Q21 is in the cut-off state; then the drain and gate of the MOS tube Q18 are both in a high level state, and the conduction condition of the MOS tube Q18 is not met, then the output voltage VCC is connected to GND and remains in a low level state, and the power of the external emergency power supply device cannot be input to the smart gas meter. When the smart gas meter controller module controls the AUTO_MC control port to output a high level, the gate of the MOS tube Q21 is at a high level, the source of the MOS tube Q21 is connected to GND, and the MOS tube Q21 is in a conducting state; the drain of the MOS tube Q21 is connected to GND at a low level, and the drain of the MOS tube Q18 connected to the drain of the MOS tube Q21 is also in a low level state. At this time, the drain of the MOS tube Q18 is in a high level state due to the input voltage VBB, so the MOS tube Q18 is in a conducting state, and the voltage output terminal VCC is connected to the voltage from the VBB terminal. At this time, the power supply of the external emergency power supply equipment can be input to the smart gas meter.

[0048] Therefore, the smart gas meter can choose whether to connect to an external emergency power supply device through its internal power switching circuit.

[0049] External power supply protection module: It is an important module to ensure that the external emergency power supply equipment is reliably connected to the smart gas meter. The smart gas meter and the emergency power supply equipment are connected through a buckle. The connection lines on the buckle include the power connection line connected to the emergency power supply equipment, the connection detection line of the emergency power supply, and the communication line for safety authentication (when the safety authentication communication method is selected as wireless, the connection line may not have a communication line). The connection detection line of the smart gas meter is pulled up to maintain a high level state, and the connection detection line of the emergency power supply equipment is pulled down to maintain a low level state. When the connection line between the smart gas meter and the emergency power supply equipment is disconnected, the connection detection line of the smart gas meter is in a high level state, indicating that the emergency power supply equipment is not connected; when the smart gas meter is connected to the emergency power supply equipment, since the connection detection line of the emergency power supply is grounded, the connection detection line of the smart gas meter is also in a low level state, indicating that the emergency power supply equipment has been connected. Therefore, the smart gas meter can confirm whether the external emergency power supply equipment is connected to the smart gas meter by detecting the connection line level state in the external power supply protection module.

[0050] Safety authentication communication module 1: used to realize safety communication authentication and data exchange with external emergency power supply equipment, and the communication method is conventional technology.

[0051] The emergency power supply equipment includes an emergency power supply, an emergency power supply equipment controller, an output power protection module, a power management module, a safety authentication communication module 2 and a human-computer interaction module 2.

[0052] Emergency power supply equipment controller: This module is the core of the emergency power supply equipment, controlling and coordinating the various modules in the emergency power supply equipment.

[0053] Human-computer interaction module 2: includes display screen, indicator lights, buttons and other modules. The display screen displays some working status and information of the emergency power supply equipment; the indicator lights can serve as prompts; the buttons can be used to trigger the screen to display relevant information of the emergency power supply equipment.

[0054] Output power protection module: cooperate with the external power protection module, it is the necessary guarantee for the safe connection between the emergency power supply equipment and the smart gas meter, and the connection is made by snap-on.

[0055] Power management module: It has the ability of efficient energy storage and voltage conversion; on the one hand, it can use the mains or solar energy for charging, and store the energy of the input power supply as its own electrical energy to the greatest extent; on the other hand, the voltage conversion of the power management module can meet the voltage requirements of each module inside the emergency power supply equipment to achieve normal operation, and it also has the function of converting and outputting different voltages, and maintains the stability of the output voltage through voltage stabilization control to meet the different voltage requirements of external electrical equipment. The power management module can also monitor the output current and voltage, and once an overload or short circuit is detected, it will automatically cut off the power output to protect the safety of external electrical equipment and itself.

[0056] Security authentication communication module 2: used to realize secure communication authentication and data exchange with the smart gas meter.

[0057] When the smart gas meter is in normal working condition after the pipeline is installed, the power detection module of the smart gas meter monitors the power supply and power status of the smart gas meter in real time. When the circuit of the smart gas meter is detected to be low, the smart gas meter will report the pressure loss alarm through the remote communication module, and at the same time display the pressure loss alarm error code on the display screen of the human-computer interaction module 1, prompting gas users and after-sales maintenance personnel to replace the battery. A smart gas meter with low power can periodically check the connection line level status in its internal external power protection module to confirm whether an external emergency power supply device is connected to the smart gas meter. When it is detected that no emergency power supply device is connected for a period of time, stop checking the connection line level status to save its own power. When the subsequent power emergency power supply device is connected to the smart gas meter, the button in the human-computer interaction module 1 can be used to trigger the detection of the connection line level status in the external power protection module of the smart gas meter.

[0058] When a gas user is in an emergency gas use situation, an external emergency power supply device can be selected to be inserted into the smart gas meter for emergency power supply. When selecting and using the emergency power supply device, the gas user can check whether the display on the display screen shows abnormalities to confirm whether the emergency power supply device is available. When the smart gas meter is connected to the emergency power supply with a buckle, the user can trigger the detection of the connection line level status in the external power supply protection module of the smart gas meter by triggering the button in the human-computer interaction module 1 of the smart gas meter. When it is detected that the smart gas meter has an external emergency power supply device connected, the smart gas meter communicates safely with the external emergency power supply device. When the communication between the two parties fails, the external emergency power supply device will not supply power to the smart gas meter, ensuring the safety of the electricity and gas equipment. When the communication between the two parties is successful, the external emergency power supply device provides the smart gas meter with the voltage required by the smart gas meter, and the smart gas meter will connect to the power supply of the emergency power supply device through its internal power switching module. At the same time, the power detection module starts to detect the power supply of the connected emergency power supply, and the smart gas meter controller automatically records the start time of connecting to the emergency power supply. The smart gas meter can then use the power of the external emergency power supply device to work. When the smart gas meter uses the power of the external emergency power supply device to work, the user or after-sales personnel can be periodically informed through the human-computer interaction module 1 or the remote module that the smart gas meter battery needs to be changed. In order to ensure the working reliability of the smart gas meter and the emergency needs of the emergency power supply device, if the smart gas meter has not changed the battery after using the emergency power supply device for a period of time, the power supply of the external emergency power supply device will be interrupted through the internal security authentication communication module 1 and the power switching module until the gas user or after-sales maintenance personnel replace the new battery of the smart gas meter and the meter resumes normal operation.

[0059] When the smart gas meter is in the working state of being powered by an external emergency power supply device, the smart gas meter replaces a new battery, and the voltage of the smart gas meter itself returns to normal, the smart gas meter interrupts the power supply of the external emergency power supply device through the internal security authentication communication module 1 and the power switching module, and switches to the working mode of using the smart gas meter's own power supply. Avoid energy waste and ensure that the emergency power supply device can release resources in time. If the external emergency power supply device is plugged in or out or the voltage of the external emergency power supply device is too low while the smart gas meter is in the working state of being powered by an external emergency power supply device, the smart gas meter will immediately issue an abnormal alarm, display the relevant abnormal status code, and immediately close the valve to cut off the gas source to ensure gas safety.

[0060] The emergency power supply equipment can be charged by the mains or solar energy, and the energy of the input power supply can be stored as its own electrical energy to the greatest extent; through voltage conversion, it can not only meet the voltage requirements of each module inside the emergency power supply equipment to achieve normal operation, but also can convert different voltage points for stable output to meet the different voltage requirements of external electrical equipment. The energy status and working status of the emergency power supply equipment can be viewed through the buttons and display screen in the human-computer interaction module 2 of the emergency power supply equipment.

[0061] The utility model provides a structure for connecting an intelligent gas meter to an emergency power supply device and switching power supply after the connection. The means of communication between the two are existing technologies and will not be described in detail here.

[0062] The utility model can ensure that the smart gas meter can obtain power support in time in an emergency, ensure the normal operation of the equipment and minimize downtime, thereby improving user experience and safety.

Claims

1. An emergency power supply system for a smart gas meter, characterized in that It includes an intelligent gas meter and an emergency power supply device. The intelligent gas meter includes an intelligent gas meter controller, a human-computer interaction module 1, a power switching module, a storage module, a sampling and metering module, a valve control module, a power detection module, an external power protection module, a safety authentication communication module 1, a second channel module and a remote communication module. The intelligent gas meter controller is respectively connected to the human-computer interaction module 1, the power switching module, the storage module, the sampling and metering module, the valve control module, the power detection module, the external power protection module, the safety authentication communication module 1, the second channel module and the remote communication module; the emergency power supply device includes an emergency power supply, an emergency power supply device controller, an output power protection module, a power management module, a safety authentication communication module 2 and a human-computer interaction module 2, and the emergency power supply device controller is respectively connected to the output power protection module, the power management module, the safety authentication communication module 2 and the human-computer interaction module 2; the intelligent gas meter and the emergency power supply device are connected via connecting lines, and the connecting lines are respectively a power connection line of the emergency power supply device, a connection detection line of the emergency power supply device and a communication line for safety communication.

2. The emergency power supply system of a smart gas meter according to claim 1, characterized in that: Smart gas meter controller: controls and coordinates the modules in the smart gas meter. After the smart gas meter is powered on normally, the smart gas meter controller adopts low power consumption working mode. Power supply detection module: It contains 2-channel power supply detection circuits, which can detect the power supply voltage of the smart gas meter itself or the input power supply voltage of the external emergency power supply device by switching the channels of the power supply detection circuit, so as to detect, control and convert the power input to the smart gas meter, ensure the normal operation of each module and component in the smart gas meter system, and monitor the power supply and power status of the smart gas meter in real time; Human-computer interaction module 1: includes a display screen, indicator lights and buttons. The display screen displays the working status and information of the smart gas meter; the indicator lights serve as prompts; the smart gas meter is triggered to open the valve and the screen is turned to display relevant information of the smart gas meter by pressing buttons; Sampling and metering module: real-time sampling and metering of gas usage flowing through the smart gas meter; Storage module: used to store relevant parameters and working information of smart gas meters; Valve control module: completes related valve opening and closing operations according to the instructions of the smart gas meter controller; Second channel module: As the second channel for information interaction of smart gas meters, production and after-sales maintenance personnel use this module to read or set relevant information and status of smart gas meters; Remote communication module: realizes remote communication and control of smart gas meters. Smart gas meters can upload meter information and status or abnormalities to the control background in real time or in real time, and inform relevant managers in time. Managers can realize remote control and remote recharge through this module; Power switching module: a channel for the smart gas meter to select the power source. The smart gas meter can choose whether to connect to an external emergency power supply device through the power switching circuit of the power switching module; External power supply protection module: The smart gas meter can confirm whether the external emergency power supply device is connected to the smart gas meter by detecting the connection line level status in the external power supply protection module; Safety authentication communication module 1: used to realize communication authentication and data exchange with external emergency power supply equipment.

3. The emergency power supply system of a smart gas meter according to claim 2, characterized in that The power switching circuit is as follows: Pin 2 of the external emergency power supply device output power interface DB1 is the input voltage VBB, and Pin 1 of the external emergency power supply device output power interface DB1 is grounded; the input voltage VBB is connected to GND after passing through the voltage stabilizing diode Z4, and at the same time, the input voltage VBB is divided into two paths after passing through the diode D1, one path is connected to the gate of the MOS tube Q18 after passing through the current limiting resistor R29, and the other path is directly connected to the drain of the MOS tube Q18, the source of the MOS tube Q18 is the output voltage VCC, and the output voltage VCC is grounded after passing through the decoupling capacitor C1; AUTO_MC is the control port of the smart gas meter controller module, the control port AUTO_MC is connected to the gate of the MOS tube Q21 after passing through the current limiting resistor R30, and at the same time, the control port AUTO_MC is grounded after passing through the pull-down resistor R91, the source of the MOS tube Q21 is connected to GND, and the drain of the MOS tube Q21 is connected to the drain of the MOS tube Q18.

4. The emergency power supply system of a smart gas meter according to claim 1, characterized in that: Emergency power supply equipment controller: controls and coordinates each module in the emergency power supply equipment; Human-computer interaction module 2: It includes a display screen, indicator lights and buttons. The display screen displays the working status and information of the emergency power supply equipment; the indicator lights serve as prompts; the buttons are used to trigger the screen to display relevant information of the emergency power supply equipment; Output power protection module: corresponds to the external power protection module; Power management module: can be charged by mains electricity or solar energy, and store the energy of input power as its own electric energy to the greatest extent; The voltage conversion of the power management module can meet the voltage requirements of each module inside the emergency power supply equipment to achieve normal operation, and can also convert and output different voltages; Security authentication communication module 2: used to realize communication authentication and data exchange with external electrical equipment.

5. The emergency power supply system of a smart gas meter according to claim 1, characterized in that The emergency power supply device can be charged by using mains electricity or solar energy.

6. The emergency power supply system of a smart gas meter according to claim 4, characterized in that The power management module can also monitor the output current and voltage, and automatically cut off the power output when an overload or short circuit is detected.

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