Ultra-low power consumption wireless hydrogen measuring device

Abstract

The invention provides an ultra-low power consumption wireless hydrogen measuring device, and relates to the technical field of ultra-low power consumption wireless hydrogen measurement, the ultra-low power consumption wireless hydrogen measuring device adopts a core hydrogen chip of a palladium-nickel alloy technology, the chip comprises two symmetrical hydrogen sensitive resistor strips, a temperature measuring resistor strip and a heating resistor strip, accurate hydrogen concentration calculation is realized through a temperature compensation method; the standby power consumption of the sensor is controlled within 10 microamperes through the ultra-low power consumption power management unit, and intelligent switching of a power supply can be realized without opening a shell by adopting a magnetically controlled switch design; the device supports wireless communication, and multi-node data transmission is carried out by utilizing the low-power-consumption ad hoc network radio frequency unit; meanwhile, the structure of the device adopts an all-metal shielding shell design, electromagnetic interference can be effectively resisted, the device is suitable for complex environments without wiring and strong electromagnetic interference, such as the top of a transformer bushing and a spindle box of a wind turbine generator, and the endurance time of equipment is remarkably prolonged through an efficient low-power-consumption design and a constant-temperature-free heating technology.

Description

Technical Field

[0001] The present invention relates to the technical field of hydrogen measurement using an ultra-low power wireless hydrogen sensor, and in particular to an ultra-low power wireless hydrogen measurement device. Background Art

[0002] An ultra-low-power wireless hydrogen sensor is a device used to measure hydrogen and transmit its data to a receiver or monitoring system via wireless communication. In industrial production, hydrogen sensors are primarily used for hydrogen leak detection and monitoring hydrogen content in transformer bushing oil at converter stations. The primary device is a 24V DC switching power supply powered hydrogen sensor. Data is processed by laying cables connecting the power and signal cables to the electrical control cabinet. Installation on transformer bushings, in particular, requires the use of armored cable, making the cabling installation cumbersome. Alternatively, a field-installed hydrogen sensor uses a 24V switching power supply to power the sensor. The output signal is then wirelessly transmitted to a receiver for data processing. This application also requires a wired power cable at the installation site. However, current hydrogen sensors, as gas detection modules, require a heating module, consuming a minimum of 0.5W, posing significant challenges for battery-powered applications.

[0003] Patent application CN109638942A proposes a passive wireless hydrogen sensor tag and system that uses a Wheatstone bridge to collect the sensor core impedance signal. After a pure analog circuit collects and amplifies the bridge sensor signal, it directly transmits the bridge sensor signal to the wireless transmitter. The entire circuit is powered by a high-power exciter. The balanced resistance bridge requires manual configuration to adjust the reference resistance value. Although a sliding resistance bridge is used, it can only be adjusted manually by a single module. The core signal acquisition circuit uses a pure analog circuit. The wireless radio frequency only transmits the bridge sensor signal and does not mention the accurate measurement of hydrogen concentration. It is also impossible to digitally mass-produce. The Wheatstone bridge also requires an excitation current of at least 2mA and consumes power continuously. The radio frequency part has no shutdown circuit, and overall power consumption is extremely high. Since it is designed for passive wireless applications, a high-power exciter is required, and the excitation distance is relatively short, less than 10 meters. Compared with the digital switching circuit used in the present invention, the standby power consumption is only 10μA and the data transmission and reception distance with the receiving end is greater than 1 km. It is not suitable for battery-powered use or places that require a long data transmission and reception distance.

[0004] Taking all the above disadvantages into consideration, a hydrogen sensor with ultra-low power consumption and wireless data transmission is designed. It is compact and easy to install, has an ultra-long standby time, and measures hydrogen at 5-minute intervals. The wireless hydrogen concentration data transmission distance in the LoRa-470MHz frequency band is more than 1 km, and the service life of the 19AH capacity 3.7V lithium-argon battery can reach more than 5 years.

[0005] The above information disclosed in this Background section is only for enhancement of understanding of the background of the present disclosure and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Summary of the Invention

[0006] The object of the present invention is to provide an ultra-low power consumption wireless hydrogen measurement device to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An ultra-low power wireless hydrogen measurement device, comprising:

[0009] The sensor module includes two sets of hydrogen-sensitive resistor strips with the same resistance temperature coefficient and two sets of voltage acquisition units, one of which is used to react with hydrogen to generate heat and change the resistance value, and the other is isolated from hydrogen. The voltage acquisition unit is used to respectively collect the voltage value of each hydrogen-sensitive resistor strip;

[0010] A constant current source module is electrically connected to the two hydrogen-sensitive resistor strips, and is used to supply power to the two hydrogen-sensitive resistor strips and perform analog-to-digital conversion on the collected voltage value to convert the voltage value into a digital value;

[0011] A sensor interface module, electrically connected to the constant current source module, configured to receive a digital value converted from the voltage values ​​of the two hydrogen-sensitive resistor strips and send the digital value to the main control module;

[0012] A main control module, electrically connected to the sensor interface module, configured to receive the digital value sent by the sensor interface module and calculate the resistance change value of the hydrogen-sensitive resistor strip that reacts with hydrogen;

[0013] The communication module is electrically connected to the main control module and is used to send the resistance change value calculated by the main control module to a receiving end using a wireless network.

[0014] Preferably, the constant current source module includes a power supply unit, a constant current source control unit, two groups of operational amplifier units, and an A / D conversion unit;

[0015] The output end of the power supply unit is electrically connected to the A / D conversion unit and the two hydrogen-sensitive resistor strips for power supply;

[0016] The input end of the constant current source control unit is electrically connected to the main control module, and the output end is electrically connected to the power supply unit, and is used to control the switch of the power supply unit according to the control signal sent by the main control module;

[0017] The input terminals of the two groups of operational amplifier units are electrically connected to the voltage acquisition unit, and the output terminals are electrically connected to the input terminal of the A / D conversion unit, for amplifying the detected voltage values;

[0018] The output end of the A / D conversion unit is electrically connected to the sensor interface module and is used to convert the amplified voltage value into a digital value.

[0019] Preferably, the measuring device further comprises a device battery, a power management unit, a magnetic control switch unit, and a power monitoring unit;

[0020] The power management unit is electrically connected to the device battery and is used to power the entire measuring device;

[0021] The magnetic control switch unit is electrically connected to the power management unit and is used to shut down the power management unit when the change in the ambient magnetic field exceeds a preset threshold;

[0022] The power monitoring unit is electrically connected to the device battery and is used to monitor the remaining power of the device battery.

[0023] Preferably, the measuring device further comprises a boost heating unit;

[0024] The boost heating unit is electrically connected to the main control module and the hydrogen-sensitive resistor strip, and is used to increase the voltage value of the hydrogen-sensitive resistor strip, thereby increasing the heating speed of the hydrogen-sensitive resistor strip.

[0025] Preferably, the measuring device further comprises a data communication unit;

[0026] The data communication unit includes a UART interface circuit and an external power interface circuit, which are used to exchange data with external devices during production debugging;

[0027] The UART interface circuit is only connected to the external device for communication and data exchange during the production debugging phase;

[0028] The external power interface circuit is electrically connected to the power management module and is electrically connected to the external power supply only during the production and debugging phase, and is used to replace the device battery to power the entire measuring device during the production and debugging phase.

[0029] Preferably, the communication module is a radio frequency self-organizing network unit, which adopts a LoRa self-organizing network radio frequency chip, whose sleep power consumption is 1.8 to 2.2 μA, and the full network wake-up signal strength threshold is -110 to -90 dBm.

[0030] Preferably, the measuring device adopts a time-intermittent working method during normal operation, with a working time of 3 seconds and a working interval of 5 minutes.

[0031] Preferably, the hydrogen-sensitive resistor strip is made of palladium-nickel alloy.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] Compared to the prior art, the present invention solves three major technical challenges in wireless hydrogen concentration measurement. First, it addresses the fact that all current hydrogen sensors require constant temperature heating to provide hydrogen measurement output. Hydrogen sensors are gas detection circuit sensors that require a circuit to heat the core hydrogen-sensitive core to a constant temperature of at least 50°C to ensure rapid hydrogen response and output. This consumes extremely high power and is not suitable for battery-powered applications. The present invention utilizes the latest palladium-nickel alloy hydrogen chip technology, which can achieve a relatively fast hydrogen response speed without the need for heating. The chip contains two symmetrical hydrogen-sensitive resistors: a temperature-measuring resistor and a heating resistor. The two hydrogen-sensitive resistors have the same temperature coefficient of resistance. One hydrogen-sensitive resistor is selected to be non-responsive to hydrogen and serves as a reference for the resistance value of the other hydrogen-sensitive resistor. The temperature-measuring resistor in the core is then used to accurately compensate for temperature and estimate the measured hydrogen concentration, achieving the same response speed and measurement accuracy as hydrogen sensors that require constant temperature heating.

[0034] Secondly, it solves the current problem that all hydrogen sensors require constant temperature heating for production calibration. During normal operation, the hydrogen sensor needs to be heated and maintained in a constant temperature environment to measure the output hydrogen concentration, which consumes a lot of power. During the production calibration stage, the present invention heats and maintains the temperature of the sensor core, achieving fast and efficient batch calibration. After calibration, the heating function is permanently turned off when the device leaves the factory. During normal operation, the hydrogen concentration is accurately calculated using ultra-low power software algorithms and temperature compensation methods, without the need for heating, thus saving power consumption and ensuring measurement accuracy.

[0035] Third, it solves the problem of power consumption when the device is in standby mode. The present invention adopts a magnetically controlled switch design, which only requires an external strong magnet to turn on or off the power supply. There is no need to open the device casing. The power supply is turned off in the inventory state, saving battery consumption; in normal working conditions, the magnetically controlled switch is combined with the low-power design to effectively extend the battery life of the device.

[0036] The present invention significantly reduces the standby power consumption of the device by setting a low-power power management module, so that the standby power consumption of the entire device is controlled within 10μA, while providing stable and reliable power supply and extending the battery life; through the magnetic control switch module integrating the TMR sensor, intelligent switching of the entire power supply of the device is realized, and power supply control can be achieved without opening the shell, which effectively reduces power consumption, simplifies operation, and improves the standby performance of the device; by setting a low-power constant current source, the accuracy of the sensor core core signal acquisition is ensured, and it can be flexibly turned off as needed to achieve an ultra-low power design; through the low-power, high-reliability radio frequency self-organizing network module, multi-node wireless communication can be realized, supporting data acquisition and transmission in large-scale scenarios; through the reasonably designed shell structure, stable operation of the device in harsh environments is ensured, while shielding of antenna signals is avoided, thereby improving signal transmission performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of the module structure of the present invention;

[0038] Figure 2 This is a schematic diagram of the circuit structure of the sensor module of the present invention;

[0039] Figure 3 This is a schematic diagram of the circuit structure of the constant current source module of the present invention;

[0040] Figure 4 This is a schematic diagram of the circuit structure of the sensor interface module of the present invention;

[0041] Figure 5 This is a schematic diagram of the circuit structure of the main control module of the present invention;

[0042] Figure 6 This is a schematic diagram of the circuit structure of the communication module of the present invention;

[0043] Figure 7 This is a schematic diagram of the circuit structure of the power management unit of the present invention;

[0044] Figure 8 This is a schematic diagram of the circuit structure of the magnetic control switch unit of the present invention;

[0045] Figure 9 This is a schematic diagram of the circuit structure of the power monitoring unit of the present invention;

[0046] Figure 10 This is a schematic diagram of the circuit structure of the boost heating unit of the present invention;

[0047] Figure 11 This is a schematic diagram of the circuit structure of the data communication unit of the present invention. DETAILED DESCRIPTION

[0048] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0049] It should be noted that, unless otherwise defined, the technical or scientific terms used in the present invention should have the usual meanings understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0050] Example:

[0051] See also Figures 1 to 11 , the present invention provides a technical solution:

[0052] An ultra-low power consumption wireless hydrogen measurement device comprises: a sensor module, a constant current source module, a sensor interface module, a main control module, and a communication module.

[0053] The sensor module includes two groups of hydrogen-sensitive resistor strips with consistent resistance temperature coefficients and two groups of voltage acquisition units. One of the hydrogen-sensitive resistor strips is used to react with hydrogen to generate heat and change the resistance value, and the other is isolated from hydrogen. The voltage acquisition unit is used to collect the voltage value of each hydrogen-sensitive resistor strip separately, and the hydrogen-sensitive resistor strips are made of palladium-nickel alloy.

[0054] By setting up the sensor modules into two groups, they can be compared with each other, making it easier to compensate for temperature drift of the detected data later, thereby eliminating measurement errors caused by changes in ambient temperature. In addition, the use of palladium-nickel alloy as the material for the hydrogen-sensitive resistor strips can improve the hydrogen adsorption sensitivity compared to the Pd film of the hydrogen concentration sensor in traditional technology. Not only is the response speed faster under heating conditions, but it also maintains a relatively fast response speed under normal temperature conditions. In other words, one of the hydrogen-sensitive resistor strips is chosen not to respond to hydrogen and is used as a reference for the resistance value of the other hydrogen-sensitive resistor strip. Then, precise temperature compensation and the measured hydrogen concentration are calculated. This can achieve the same response speed and measurement accuracy as hydrogen sensors that require constant temperature heating, solving the problem that existing hydrogen concentration sensors still need to be heated under normal working conditions, and greatly reducing the overall power consumption of the device.

[0055] The constant current source module is electrically connected to the two hydrogen-sensitive resistor strips, and is used to supply power to the two hydrogen-sensitive resistor strips and perform analog-to-digital conversion on the collected voltage value to convert the voltage value into a digital value.

[0056] The constant current source module includes a power supply unit, a constant current source control unit, two sets of operational amplifier units, and an A / D conversion unit;

[0057] The power supply unit can be a constant current source power supply circuit built by the LMP2021 series operational amplifier. Its output end is electrically connected to the A / D conversion unit and two hydrogen sensitive resistors for power supply.

[0058] The input end of the constant current source control unit is electrically connected to the main control module, and the output end is electrically connected to the power supply unit, and is used to control the switch of the power supply unit according to the control signal sent by the main control module;

[0059] The input ends of the two groups of operational amplifier units are electrically connected to the voltage acquisition unit, and the output ends are electrically connected to the input end of the A / D conversion unit, for amplifying the detected voltage values.

[0060] The constant current source control unit and the two sets of operational amplifier units can be implemented using functional circuits constructed using AD8554 series operational amplifiers.

[0061] The A / D conversion unit can adopt an A / D conversion chip of the DAC8562 series, whose output end is electrically connected to the sensor interface module for converting the amplified voltage value into a digital value.

[0062] By setting up two groups of operational amplifier units to amplify the detected voltage value, the μV-level resistance change signal can be amplified to the ADC effective range. In addition, this closed-loop constant current control can ensure output stability, thereby ensuring measurement repeatability and improving the accuracy of the detected data.

[0063] The sensor interface module is electrically connected to the constant current source module, receiving the digital value converted from the voltage across the two hydrogen-sensitive resistor strips and transmitting it to the main control module. The sensor interface module utilizes a four-wire resistance acquisition method, effectively eliminating errors in the interface lead resistance and providing more accurate measurements of the actual core impedance. Furthermore, an impedance matching circuit can be configured as needed to eliminate high-frequency reflections and ensure signal integrity.

[0064] The main control module uses the ADuCM362 series microprocessor chip, and the specific model can be ADuCM362BCPZ256. It is electrically connected to the sensor interface module, and is used to receive the digital value sent by the sensor interface module and calculate the resistance change value of the hydrogen-sensitive resistor strip that reacts with hydrogen.

[0065] The microprocessor chip used in the main control module is a low-power ARM Cortex-M3 processor, a 32-bit RISC machine with direct programmable control and configurable into a number of low-power operating modes, including a sleep mode that consumes only 4μA. In sleep mode, peripherals such as external interrupts or an internal wake-up timer can wake the device. This mode allows the device to operate at extremely low power while still responding to external asynchronous or periodic events. This means that basic functions such as power management and data exchange can still be performed in sleep mode, further reducing the overall power consumption of the measurement device.

[0066] The communication module is electrically connected to the main control module. It is a radio frequency self-organizing network unit. Specifically, it can adopt the ZLS420 series LoRa self-organizing network radio frequency chip. Its sleep power consumption is 1.8~2.2μA, and the full network wake-up signal strength threshold is -110~-90dBm. It is used to use the wireless network to send the resistance change value calculated by the main control module to the receiving end.

[0067] The measuring device also includes a device battery, a power management unit, a magnetic control switch unit, and a power monitoring unit;

[0068] The device battery here can be any battery that meets the requirements. The power management unit can use a control chip of the MAX77642ANA series, which is electrically connected to the device battery to power the entire measuring device;

[0069] The magnetic control switch unit can be obtained by integrating the TMR1302 magnetic switch chip and the MAX40203 model ideal diode current switch, which is electrically connected to the power management unit and is used to shut down the power management unit when the ambient magnetic field changes exceed a preset threshold.

[0070] Specifically, the magnetic control switch unit can convert the changing magnetic field signal into a digital voltage signal to achieve accurate position detection. The magnetic switch chip operates in full-time power supply mode, maintaining low power consumption while achieving true continuous detection of magnetic field signals, avoiding the sampling errors caused by the traditional time-sharing power supply mode. The static power supply current of the magnetic control chip is as low as 1.5μA, and it maintains a magnetic signal response frequency of 5kHz. When in use, only an external strong magnet is needed to turn on or off the power supply of the sensor, and it can be shut down without opening the shell. After production is completed, it can be convenient for inexperienced workers to operate independently, thereby saving energy and reducing consumption.

[0071] The power monitoring unit can use the BQ35100PWR power monitoring chip, which is electrically connected to the device battery to monitor the remaining charge of the device battery. This chip provides accurate results with ultra-low average power consumption and can be controlled by the main control module via the GAUGEENABLE (GE) pin, achieving power consumption of less than 2μA. The chip only needs to be powered for a long enough time at the update frequency determined by the system to collect data and perform calculations to support the selected algorithm. Because the monitor does not need to be powered to measure all discharge activities, it does not consume additional power and can better perform power monitoring on the device battery.

[0072] The measuring device also includes a boost heating unit;

[0073] The boost heating unit can be composed of a TPS61230ARNST model synchronous DC-DC current converter, plus AD8554 series and INA333 series operational amplifiers. It is electrically connected to the main control module and the hydrogen-sensitive resistor strip to increase the voltage value of the hydrogen-sensitive resistor strip, thereby increasing the heating rate of the hydrogen-sensitive resistor strip.

[0074] The boost heating unit is designed to meet the dual requirements of speed and efficiency during production and debugging. This unit heats the hydrogen-sensitive resistor strip to improve its response speed and sensitivity to hydrogen. After calibration, the device is permanently deactivated when shipped. This allows accurate hydrogen measurement output even without the need for constant temperature heating. This addresses the current issue of excessive calibration time in wireless hydrogen sensor production. In other words, heating is activated during calibration to achieve fast and efficient mass production, while heating is permanently deactivated during normal operation to conserve power consumption and accurately calculate hydrogen concentration output values ​​using an ultra-low-power software algorithm for compensation.

[0075] The measuring device also includes a data communication unit;

[0076] The data communication unit includes a UART interface circuit and an external power interface circuit, which are used to exchange data with external devices during production debugging;

[0077] The UART interface circuit communicates with external devices and exchanges data only during the production debugging phase;

[0078] The external power interface circuit is electrically connected to the power management module and is only electrically connected to the external power supply during the production and debugging phase. It is used to replace the device battery to power the entire measuring device during the production and debugging phase.

[0079] The measuring device adopts the time-interrupted working method during normal operation, with a working time of 3S and a working interval of 5min.

[0080] In summary, the present invention adopts a core hydrogen chip based on palladium-nickel alloy technology. The chip contains two symmetrical hydrogen-sensitive resistors, a temperature-measuring resistor and a heating resistor, and realizes accurate hydrogen concentration estimation through temperature compensation method. The sensor controls the standby power consumption within 10μA through an ultra-low power management unit, and adopts a magnetically controlled switch design, which can realize intelligent switching of power without opening the shell. The device supports wireless communication and uses a low-power self-organizing network radio frequency unit for multi-node data transmission. At the same time, the device structure adopts an all-metal shielding shell design, which can effectively resist electromagnetic interference and is suitable for complex environments without wiring and strong electromagnetic interference such as the top of the transformer bushing and the main shaft box of a wind turbine. The efficient low-power design and constant temperature heating technology can significantly extend the equipment life.

[0081] The above formulas are all dimensionless and numerical calculations. The formulas are obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formulas are set by technicians in this field according to actual conditions.

[0082] The above embodiments can be implemented in whole or in part by software, hardware, firmware, or any other combination thereof. When implemented using software, the above embodiments can be implemented in whole or in part in the form of a computer program product. Those skilled in the art will appreciate that the modules and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed by hardware or software depends on the specific application and design constraints of the technical solution.

[0083] The modules described as separate components may or may not be physically separated, and the components displayed as modules may or may not be physical modules, and may be located in one place or distributed across multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the present embodiment. The above is only a specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should all be covered by the scope of protection of the present application.

Claims

1. An ultra-low power wireless hydrogen measurement device, characterized in that: include: The sensor module includes two sets of hydrogen-sensitive resistor strips with the same resistance temperature coefficient and two sets of voltage acquisition units, one of which is used to react with hydrogen to generate heat and change the resistance value, and the other is isolated from hydrogen. The voltage acquisition unit is used to respectively collect the voltage value of each hydrogen-sensitive resistor strip; A constant current source module is electrically connected to the two hydrogen-sensitive resistor strips, and is used to supply power to the two hydrogen-sensitive resistor strips and perform analog-to-digital conversion on the collected voltage value to convert the voltage value into a digital value; A sensor interface module, electrically connected to the constant current source module, configured to receive a digital value converted from the voltage values ​​of the two hydrogen-sensitive resistor strips and send the digital value to the main control module; A main control module, electrically connected to the sensor interface module, configured to receive the digital value sent by the sensor interface module and calculate the resistance change value of the hydrogen-sensitive resistor strip that reacts with hydrogen; The communication module is electrically connected to the main control module and is used to send the resistance change value calculated by the main control module to a receiving end using a wireless network.

2. The ultra-low power consumption wireless hydrogen measurement device according to claim 1, characterized in that: The constant current source module includes a power supply unit, a constant current source control unit, two sets of operational amplifier units, and an A / D conversion unit; The output end of the power supply unit is electrically connected to the A / D conversion unit and the two hydrogen-sensitive resistor strips for power supply; The input end of the constant current source control unit is electrically connected to the main control module, and the output end is electrically connected to the power supply unit, and is used to control the switch of the power supply unit according to the control signal sent by the main control module; The input terminals of the two groups of operational amplifier units are electrically connected to the voltage acquisition unit, and the output terminals are electrically connected to the input terminal of the A / D conversion unit, for amplifying the detected voltage values; The output end of the A / D conversion unit is electrically connected to the sensor interface module and is used to convert the amplified voltage value into a digital value.

3. The ultra-low power consumption wireless hydrogen measurement device according to claim 1, characterized in that: The measuring device also includes a device battery, a power management unit, a magnetic control switch unit, and a power monitoring unit; The power management unit is electrically connected to the device battery and is used to power the entire measuring device; The magnetic control switch unit is electrically connected to the power management unit and is used to shut down the power management unit when the change in the ambient magnetic field exceeds a preset threshold; The power monitoring unit is electrically connected to the device battery and is used to monitor the remaining power of the device battery.

4. The ultra-low power consumption wireless hydrogen measurement device according to claim 1, characterized in that: The measuring device further comprises a boost heating unit; The boost heating unit is electrically connected to the main control module and the hydrogen-sensitive resistor strip, and is used to increase the voltage value of the hydrogen-sensitive resistor strip, thereby increasing the heating speed of the hydrogen-sensitive resistor strip.

5. The ultra-low power consumption wireless hydrogen measurement device according to claim 1, characterized in that: The measuring device further comprises a data communication unit; The data communication unit includes a UART interface circuit and an external power interface circuit, which are used to exchange data with external devices during production debugging; The UART interface circuit is only connected to the external device for communication and data exchange during the production debugging phase; The external power interface circuit is electrically connected to the power management module and is electrically connected to the external power supply only during the production and debugging phase, and is used to replace the device battery to power the entire measuring device during the production and debugging phase.

6. The ultra-low power consumption wireless hydrogen measurement device according to claim 1, characterized in that: The communication module is a radio frequency self-organizing network unit, which adopts the LoRa self-organizing network radio frequency chip. Its sleep power consumption is 1.8 to 2.2 μA, and the full network wake-up signal strength threshold is -110 to -90 dBm.

7. The ultra-low power consumption wireless hydrogen measurement device according to claim 1, characterized in that: The measuring device adopts a time-interrupted working method during normal operation, with a working time of 3 seconds and a working interval of 5 minutes.

8. The ultra-low power consumption wireless hydrogen measurement device according to claim 1, characterized in that: The hydrogen-sensitive resistor strip is made of palladium-nickel alloy.

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