A kind of intrinsically safe pressure sensor for mine use with anti-counterfeiting function

Abstract

The present invention relates to a mine intrinsically safe pressure sensor with an anti-counterfeiting function, comprising: a physical quantity and electrical signal conversion module for sensing a pressure physical quantity and converting it into a voltage signal; a voltage-frequency conversion module for receiving the voltage signal; a timing module for periodically outputting a low level that shorts the voltage signal received by the voltage-frequency conversion module to the ground; the voltage-frequency conversion module is further configured to convert the voltage signal into a frequency signal corresponding to the voltage signal and output it when the timing module does not output a low level; and is further configured to convert the voltage signal shorted to the ground into a frequency signal with a frequency of zero or a fixed value and output it when the timing module outputs a low level; the present invention determines whether the mine intrinsically safe pressure sensor matches an associated device based on the correspondence between the voltage signal and the frequency signal or the time interval during which the voltage-frequency conversion module outputs a frequency signal with a frequency of zero or a fixed value.

Description

Technical Field

[0001] The present invention relates to the field of sensors, and particularly to a intrinsically safe type pressure sensor for mine use with an anti-counterfeiting function. Background Art

[0002] A pressure sensor is one of the most widely used sensors in mine equipment, mainly used for measuring the fluid pressure, gas pressure, etc. of mine equipment. Different from ordinary pressure sensors, a mine pressure sensor needs to obtain a corresponding license according to the coal mine safety standard before it can be used on mine equipment. At present, the mine pressure sensors mainly adopt two explosion-proof types: encapsulated type and intrinsically safe type, among which the intrinsically safe type accounts for the largest proportion. For an intrinsically safe type pressure sensor, when designing the circuit, it is necessary to meet the coal mine safety standard, and there are strict regulations on parameters such as the maximum working voltage, working current, load capacitance, and load inductance. The supporting equipment also needs to be jointly inspected with the sensor before it can be applied underground. However, at present, due to the large number of pressure sensor manufacturers, most of the output signals are voltage signals or current signals, with strong compatibility. When users replace accessories to reduce costs, they may purchase ordinary pressure sensors from the market and apply them underground, bringing huge safety hazards to coal mines. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an intrinsically safe type pressure sensor for mine use with an anti-counterfeiting function, and to judge whether the sensor is an intrinsically safe type sensor jointly inspected with the associated equipment through the output of the sensor.

[0004] The technical solution for the present invention to solve the above technical problem is as follows: An intrinsically safe type pressure sensor for mine use with an anti-counterfeiting function includes a physical quantity and electrical signal conversion module, a voltage-frequency conversion module, and a timing module;

[0005] The physical quantity and electrical signal conversion module is used to sense the pressure physical quantity, and convert the sensed pressure physical quantity into a voltage signal and output it;

[0006] The voltage-frequency conversion module is used to receive the voltage signal output by the physical quantity and electrical signal conversion module;

[0007] The timing module is used to periodically output a low level that shorts the voltage signal received by the voltage-frequency conversion module to the ground;

[0008] The voltage-frequency conversion module is further used to convert the voltage signal into a frequency signal corresponding to the voltage signal and output it when the timing module does not output the low level; and is further used to convert the voltage signal shorted to the ground into a frequency signal with a frequency of zero or a fixed value and output it when the timing module outputs the low level;

[0009] Among them, the correspondence between the voltage signal and the frequency signal, or the time interval when the frequency signal output by the voltage-frequency conversion module is zero or a fixed value, is used to determine whether the intrinsically safe pressure sensor for mine use matches the associated device.

[0010] Based on the above technical solutions, the present invention can be further improved as follows.

[0011] Furthermore, an intrinsically safe pressure sensor for mine use with an anti-counterfeiting function is externally provided with a sensor signal acquisition module; the sensor signal acquisition module is used to collect the voltage signal output by the physical quantity and electrical signal conversion module and the frequency signal output by the voltage-frequency conversion module, establish a correspondence between the voltage signal and the frequency signal, and determine whether the correspondence between the voltage signal and the frequency signal meets a preset correspondence; if the correspondence between the voltage signal and the frequency signal does not meet the preset correspondence, it is determined that the intrinsically safe pressure sensor for mine use does not match the associated device; if the correspondence between the voltage signal and the frequency signal meets the preset correspondence, it is determined that the intrinsically safe pressure sensor for mine use matches the associated device.

[0012] Furthermore, an intrinsically safe pressure sensor for mine use with an anti-counterfeiting function is externally provided with a sensor signal acquisition module; the sensor signal acquisition module is used to collect the time interval when the frequency signal output by the voltage-frequency conversion module is zero or a fixed value, and determine whether the time interval meets a preset time interval; if the time interval does not meet the preset time interval, it is determined that the intrinsically safe pressure sensor for mine use does not match the associated device; if the time interval meets the preset time interval, it is determined that the intrinsically safe pressure sensor for mine use matches the associated device.

[0013] Furthermore, when it is determined that the intrinsically safe pressure sensor for mine use does not match the associated device, the sensor signal acquisition module is further used to emit a warning signal and control the associated device to stop.

[0014] Further, the physical quantity and electrical signal conversion module includes a pressure sensing bridge for sensing the physical quantity of pressure and a signal conditioning chip for converting the sensed physical quantity of pressure into a voltage signal. One bridge input terminal of the pressure sensing bridge is connected to the bridge drive pin of the signal conditioning chip, and the other bridge input terminal of the pressure sensing bridge is grounded. The two bridge output terminals of the pressure sensing bridge are respectively connected to the positive and negative data signal input pins of the signal conditioning chip. The negative power supply voltage pin of the signal conditioning chip is connected to the power supply, and the negative power supply voltage pin of the signal conditioning chip is also grounded through a parallel-connected tenth capacitor and eleventh capacitor. The positive power supply voltage pin of the signal conditioning chip and the positive power supply voltage pin of the EEPROM are both grounded through a ninth capacitor. The voltage signal output pin of the signal conditioning chip serves as the output terminal of the physical quantity and electrical signal conversion module for outputting the voltage signal.

[0015] Further, the physical quantity and electrical signal conversion module further includes a low-pass filter for filtering the voltage signal output from the voltage signal output pin of the signal conditioning chip. The low-pass filter includes a seventh resistor and a twelfth capacitor. One end of the seventh resistor is connected to the voltage signal output pin of the signal conditioning chip, the other end of the seventh resistor is grounded through the twelfth capacitor, and the other end of the seventh resistor is also used for outputting the filtered voltage signal.

[0016] Further, the voltage-frequency conversion module includes a voltage-frequency conversion chip and a crystal oscillator. The input terminal of the crystal oscillator is connected to the clock output pin of the voltage-frequency conversion chip, the output terminal of the crystal oscillator is connected to the clock input pin of the voltage-frequency conversion chip, the input terminal of the crystal oscillator is also grounded through a third capacitor, and the output terminal of the crystal oscillator is also grounded through a fourth capacitor. The reference power supply pin of the voltage-frequency conversion chip is connected to the power supply, the reference power supply pin of the voltage-frequency conversion chip is also grounded through a seventh capacitor, the buffer power supply pin and the power supply pin of the voltage-frequency conversion chip are both connected to the power supply, the buffer power supply pin and the power supply pin of the voltage-frequency conversion chip are also both grounded through a sixth capacitor. The signal input pin of the voltage-frequency conversion chip serves as the input terminal of the voltage-frequency conversion module for receiving the voltage signal. The signal output pin of the voltage-frequency conversion chip is connected to one end of a fourth resistor, and the other end of the fourth resistor is grounded through a fifth capacitor. The other end of the fourth resistor serves as the output terminal of the voltage-frequency conversion module for outputting the frequency signal.

[0017] Further, the timing module includes a timing chip. The power supply pin and the enable pin of the timing chip are both connected to a power supply. The power supply pin of the timing chip is also grounded through an eighth capacitor. The delay pin of the timing chip is grounded through a fifth resistor. The output pin of the timing chip is used to output the low level. The output pin of the timing chip is connected to the input end of the voltage-frequency conversion module. The output pin of the timing chip is also connected to the output end of the physical quantity and electrical signal conversion module through a sixth resistor.

[0018] Further, the intrinsically safe type pressure sensor for mine use with an anti-counterfeiting function further includes a sensor power supply module, which is used to supply power to the physical quantity and electrical signal conversion module, the voltage-frequency conversion module, and the timing module.

[0019] Further, the sensor power supply module includes a voltage conversion chip. The power supply input pin of the voltage conversion chip is connected to an external power supply. The power supply input pin of the voltage conversion chip is also grounded through a second capacitor. The enable pin of the voltage conversion chip is connected to the external power supply through a second resistor. The power supply output pin of the voltage conversion chip is used to output a power supply for supplying power to the physical quantity and electrical signal conversion module, the voltage-frequency conversion module, and the timing module. The power supply output pin of the voltage conversion chip is also grounded through a first capacitor. The power supply output pin of the voltage conversion chip is also connected to the voltage adjustment pin of the voltage conversion chip through a first resistor. The voltage adjustment pin of the voltage conversion chip is also grounded through a third resistor.

[0020] The beneficial effects of the present invention are as follows: In a intrinsically safe pressure sensor for mine use with an anti-counterfeiting function according to the present invention, while the physical quantity and electrical signal conversion module outputs a voltage signal, it also outputs a frequency signal corresponding to the voltage signal through the voltage-frequency conversion module, and the output frequency of the frequency signal changes with the change of the output voltage of the voltage signal; and the timing module outputs a low level according to the set time, shorting the input voltage of the voltage-frequency conversion module to the ground, so that the frequency of the frequency signal output by the voltage-frequency conversion module can be changed to zero or a certain fixed value without affecting the output voltage of the physical quantity and electrical signal conversion module; when normally collecting the voltage signal output by the physical quantity and electrical signal conversion module, the frequency signal output by the voltage-frequency conversion module is collected at the same time, and the two are corrected. If the corresponding relationship between the two is different from the preset relationship, it indicates that the pressure sensor is a counterfeit sensor and cannot be applied to the associated equipment underground in the mine; it is also possible to further collect the time interval of the frequency signal with the output frequency of the voltage-frequency conversion module being zero or a fixed value and make a judgment. If the collected interval time is inconsistent with the preset interval, it indicates that the pressure sensor is not an intrinsically safe pressure sensor for mine use jointly inspected with the associated equipment, that is, the pressure sensor is a counterfeit sensor and cannot be applied to the associated equipment underground in the mine; in this way, the huge safety hazards brought by using counterfeit pressure sensors to the coal mine can be eliminated. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural block diagram of an intrinsically safe pressure sensor for mine use with an anti-counterfeiting function according to the present invention;

[0022] Figure 2 is a circuit schematic diagram of the sensor power supply module;

[0023] Figure 3 is a circuit schematic diagram of the voltage-frequency conversion module;

[0024] Figure 4 is a circuit schematic diagram of the timing module;

[0025] Figure 5 is a circuit schematic diagram of the physical quantity and electrical signal conversion module;

[0026] Figure 6 is an overall circuit schematic diagram of an intrinsically safe pressure sensor for mine use with an anti-counterfeiting function according to the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0027] The principles and features of the present invention will be described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0028] As Figure 1As shown in the figure, a intrinsically safe pressure sensor for mine use with anti-counterfeiting function includes a physical quantity and electrical signal conversion module, a voltage-frequency conversion module, and a timing module;

[0029] The physical quantity and electrical signal conversion module is used to sense the pressure physical quantity, and convert the sensed pressure physical quantity into a voltage signal and output it;

[0030] The voltage-frequency conversion module is used to receive the voltage signal output by the physical quantity and electrical signal conversion module;

[0031] The timing module is used to periodically output a low level that shorts the voltage signal received by the voltage-frequency conversion module to the ground;

[0032] The voltage-frequency conversion module is also used to convert the voltage signal into a frequency signal corresponding to the voltage signal and output it when the timing module does not output the low level; it is also used to convert the voltage signal shorted to the ground into a frequency signal with a frequency of zero or a fixed value and output it when the timing module outputs the low level;

[0033] Among them, the correspondence between the voltage signal and the frequency signal or the time interval when the voltage-frequency conversion module outputs a frequency signal with a frequency of zero or a fixed value is used to determine whether the intrinsically safe pressure sensor for mine use matches the associated device.

[0034] In this specific embodiment: An intrinsically safe pressure sensor for mine use with anti-counterfeiting function is externally equipped with a sensor signal acquisition module; the sensor signal acquisition module is used to acquire the voltage signal output by the physical quantity and electrical signal conversion module and the frequency signal output by the voltage-frequency conversion module, establish a correspondence between the voltage signal and the frequency signal, and determine whether the correspondence between the voltage signal and the frequency signal meets a preset correspondence; if the correspondence between the voltage signal and the frequency signal does not meet the preset correspondence, it is determined that the intrinsically safe pressure sensor for mine use does not match the associated device; if the correspondence between the voltage signal and the frequency signal meets the preset correspondence, it is determined that the intrinsically safe pressure sensor for mine use matches the associated device.

[0035] In another embodiment: An intrinsically safe pressure sensor for mines with an anti-counterfeiting function is externally equipped with a sensor signal acquisition module; the sensor signal acquisition module is used to collect the time interval of the frequency signal with an output frequency of zero or a fixed value by the voltage-frequency conversion module, and determine whether the time interval meets a preset time interval; if the time interval does not meet the preset time interval, it is determined that the intrinsically safe pressure sensor for mines does not match the associated device; if the time interval meets the preset time interval, it is determined that the intrinsically safe pressure sensor for mines matches the associated device.

[0036] In this embodiment or another embodiment: The sensor signal acquisition module is further used to emit a warning signal and control the shutdown of the associated device when it is determined that the intrinsically safe pressure sensor for mines does not match the associated device. Among them, the sensor signal acquisition module can be installed in the associated device related to the sensor, and whether the sensor matches the associated device can be judged by the associated device.

[0037] In this embodiment: The intrinsically safe pressure sensor for mines with an anti-counterfeiting function further includes a sensor power supply module, and the sensor power supply module is used to supply power to the physical quantity and electrical signal conversion module, the voltage-frequency conversion module, and the timing module.

[0038] The circuit principles of each module are explained below:

[0039] As Figure 2 shown: The sensor power supply module includes a voltage conversion chip U1. The power input pin VIN of the voltage conversion chip U1 is connected to an external power supply POWER_IN. The power input pin VIN of the voltage conversion chip U1 is also grounded through a second capacitor C2. The enable pin EN of the voltage conversion chip U1 is connected to the external power supply POWER_IN through a second resistor R2. The power output pin VOUT of the voltage conversion chip U1 is used to output a power supply VCC for supplying power to the physical quantity and electrical signal conversion module, the voltage-frequency conversion module, and the timing module. The power output pin VOUT of the voltage conversion chip U1 is also grounded through a first capacitor C1. The power output pin VOUT of the voltage conversion chip U1 is also connected to the voltage adjustment pin ADJ of the voltage conversion chip U1 through a first resistor R1. The voltage adjustment pin ADJ of the voltage conversion chip U1 is also grounded through a third resistor R3.

[0040] In the sensor power supply module:

[0041] 1) The power supply for the sensor is provided by a intrinsically safe power supply for coal mines. After being filtered by the second capacitor C2 at the input end, it is connected to the voltage conversion chip U1. The output voltage of U1 can be adjusted by the first resistor R1 and the third resistor R3. The first capacitor C1 is the output filter capacitor for the voltage conversion chip U1.

[0042] 2) The voltage conversion chip U1 is a linear power supply with a wide input voltage range (2.7V - 40V), low dropout voltage (200mV), and high precision (±0.8%) to ensure the output accuracy of the sensor signal.

[0043] 3) To be compatible with the intrinsically safe parameters of the sensor-connected device, two diodes for double reverse connection prevention inside the sensor are removed, and relatively small filter capacitors are selected as much as possible.

[0044] As Figure 3 shown: The voltage-frequency conversion module includes a voltage-frequency conversion chip U2 and a crystal oscillator Y1. The input end of the crystal oscillator Y1 is connected to the clock output pin CLKOUT of the voltage-frequency conversion chip U2, the output end of the crystal oscillator Y1 is connected to the clock input pin CLKIN of the voltage-frequency conversion chip U2. The input end of the crystal oscillator Y1 is also grounded through the third capacitor C3, and the output end of the crystal oscillator Y1 is also grounded through the fourth capacitor C4; the reference power supply pin REF of the voltage-frequency conversion chip U2 is connected to the power supply VCC, the reference power supply pin REF of the voltage-frequency conversion chip U2 is also grounded through the seventh capacitor C7, the buffer power supply pin BUF and the power supply pin VDD of the voltage-frequency conversion chip U2 are both connected to the power supply VCC, the buffer power supply pin BUF and the power supply pin VDD of the voltage-frequency conversion chip U2 are also both grounded through the sixth capacitor C6. The signal input pin VIN of the voltage-frequency conversion chip U2 is used as the input end of the voltage-frequency conversion module to receive the voltage signal. The signal output pin FOUT of the voltage-frequency conversion chip U2 is connected to one end of the fourth resistor R4, and the other end of the fourth resistor R4 is grounded through the fifth capacitor C5. The other end of the fourth resistor R4 is used as the output end of the voltage-frequency conversion module to output the frequency signal.

[0045] In the voltage-frequency conversion module:

[0046] The voltage-frequency conversion module converts the voltage signal output by the physical quantity and electrical signal conversion module into a frequency signal for output, mutually corrects with the voltage signal, and is used in conjunction with a sensor signal acquisition device with an anti-counterfeiting function. While increasing the reliability of the sensor, it has a certain anti-counterfeiting effect.

[0047] 1) The voltage-frequency conversion chip U2 can output different frequencies according to the amplitude of the voltage signal, and the highest output frequency can reach 1MHz.

[0048] 2) The crystal oscillator Y1 provides a frequency reference source for the voltage-frequency conversion chip U2. The third capacitor C3 and the fourth capacitor C4 are the load capacitors of the crystal oscillator Y1.

[0049] 3) The sixth capacitor C6 and the seventh capacitor C7 are filter capacitors. The fourth resistor R4 and the fifth capacitor C5 form a low-pass filter to improve the output quality of the frequency signal.

[0050] 4) The voltage signal output by the physical quantity and electrical signal conversion module is connected to the 4th pin (signal name V_VF) of the voltage-frequency conversion chip U2 after passing through the sixth resistor R6 (see Figure 6 ).

[0051] As Figure 4 shown: The timing module includes a timing chip U3. The power supply pin VDD and the enable pin EN of the timing chip U3 are both connected to the power supply VCC. The power supply pin VDD of the timing chip U3 is also grounded through the eighth capacitor C8. The delay pin DELAY of the timing chip U3 is grounded through the fifth resistor R5. The output pin DRV of the timing chip U3 is used to output the low level. The output pin DRV of the timing chip U3 is connected to the input end of the physical quantity and electrical signal conversion module, and the output pin DRV of the timing chip U3 is also connected to the output end of the physical quantity and electrical signal conversion module through the sixth resistor R6.

[0052] In the timing module:

[0053] The timing module outputs a low level according to the set time, short-circuits the V_VF signal to the ground, makes the V_VF signal become 0V, and changes the frequency of the signal output by the voltage-frequency conversion module.

[0054] 1) The timing chip U3 has a built-in reference frequency source inside, and the set time interval can be 100 ms to 7200 s, and the timing accuracy is as high as ±1%.

[0055] 2) The timing time is adjusted through the fifth resistor R5. The DRV signal terminal (the 5th pin) of the timing chip U3 outputs a low level periodically according to the set value of the fifth resistor R5. When the low level is output, the V_VF signal becomes 0V, and the frequency of the frequency signal F_OUT output by the voltage-frequency conversion module becomes 0 or a certain fixed value, but the sensor output voltage signal V_OUT is not affected. When the low level is not output, the frequency of the frequency signal F_OUT output by the voltage-frequency conversion module is proportional to the sensor output voltage signal V_OUT.

[0056] 3) The eighth capacitor C8 is a filter capacitor.

[0057] As Figure 5As shown in the figure: The physical quantity and electrical signal conversion module includes a pressure sensing bridge U4 for sensing the physical quantity of pressure and a signal conditioning chip U5 for converting the sensed physical quantity of pressure into a voltage signal. One electrical bridge input terminal P of the pressure sensing bridge U4 is connected to the electrical bridge drive pin BDR of the signal conditioning chip U5. The other electrical bridge input terminal N of the pressure sensing bridge U4 is grounded. The two electrical bridge output terminals of the pressure sensing bridge U4 are respectively connected to the positive and negative data signal input pins IN+ and IN- of the signal conditioning chip U5. The negative power supply voltage pin VDDX of the signal conditioning chip U5 is connected to the power supply VCC, and the negative power supply voltage pin VDDX of the signal conditioning chip U5 is also grounded through a parallel connection of a tenth capacitor C10 and an eleventh capacitor C11. The positive power supply voltage pin VDD of the signal conditioning chip U5 and the positive power supply voltage pin VDDF of the EEPROM are both grounded through a ninth capacitor C9. The voltage signal output pin OUT of the signal conditioning chip U5 serves as the output terminal of the physical quantity and electrical signal conversion module for outputting the voltage signal V_VR. The physical quantity and electrical signal conversion module further includes a low-pass filter for filtering the voltage signal V_VR output from the voltage signal output pin OUT of the signal conditioning chip U5. The low-pass filter includes a seventh resistor R7 and a twelfth capacitor C12. One end of the seventh resistor R7 is connected to the voltage signal output pin OUT of the signal conditioning chip U5, and the other end of the seventh resistor R7 is grounded through the twelfth capacitor C12. The other end of the seventh resistor R7 is also used for outputting the filtered voltage signal.

[0058] In the physical quantity and electrical signal conversion module:

[0059] The physical quantity and electrical signal conversion module mainly converts the physical variables generated by pressure into voltage signals through circuit conversion. For example, it converts the resistance signal output by the piezoresistive pressure sensing bridge U4 into a voltage signal for output. It can also use a piezoelectric pressure sensing bridge U4, a capacitive pressure sensing bridge U4, etc. according to the usage conditions of the sensor.

[0060] 1) According to different pressures, the resistance value output by the electrical bridge of the pressure sensing bridge U4 changes. This piezoresistive sensing unit can detect a pressure range of 1 MPa to 180 Mpa, with an accuracy of 0.2% FS.

[0061] 2) U5 is a high-precision signal conditioning chip. This signal conditioning chip has functions of amplification, calibration, and temperature compensation. It has an internal 32-stage programmable gain amplifier, which can adjust the output voltage range of the sensor within the full scale and can work reliably in the range of -40°C to 125°C.

[0062] 3) The ninth capacitor C9, the tenth capacitor C10, and the eleventh capacitor C11 are all filter capacitors. The seventh resistor R7 and the twelfth capacitor C12 form a low-pass filter to improve the quality of the output signal.

[0063] The overall structure formed by Figures 2 to 5 is as shown in Figure 6 Figure.

[0064] In a kind of intrinsically safe pressure sensor for mine use with an anti-counterfeiting function according to the present invention: 1) While the sensor outputs a conventional voltage signal, it outputs a frequency signal that is proportional to the voltage signal. The voltage signal is the main signal and the frequency signal is the auxiliary signal. The voltage signal and the frequency signal can be corrected with each other to improve the reliability of the sensor. 2) The sensor is internally equipped with a timer that can output a low level, changing the frequency of the output frequency signal to zero or a fixed value without affecting the voltage output signal. 3) The time interval for the timer to output a low level is adjustable and can be differentially set according to the factory time of the sensor, the connected equipment, and different users, etc., increasing the difficulty of forging the sensor. 4) The signal acquisition module of the sensor simultaneously acquires the voltage signal, the frequency signal, and the time interval when the frequency signal changes to zero or a fixed frequency, and makes a judgment, which can effectively identify whether it is a forged sensor.

[0065] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A kind of intrinsically safe pressure sensor for mine use with anti-counterfeiting function, characterized in that: It includes a physical quantity and electrical signal conversion module, a voltage-frequency conversion module, and a timing module; The physical quantity and electrical signal conversion module is used to sense the pressure physical quantity, convert the sensed pressure physical quantity into a voltage signal and output it; The voltage-frequency conversion module is used to receive the voltage signal output by the physical quantity and electrical signal conversion module; The timing module is used to periodically output a low level that shorts the voltage signal received by the voltage-frequency conversion module to the ground; The voltage-frequency conversion module is further used to convert the voltage signal into a frequency signal corresponding to the voltage signal and output it when the timing module does not output the low level; it is also used to convert the voltage signal shorted to the ground into a frequency signal with a frequency of zero or a fixed value and output it when the timing module outputs the low level; Among them, the correspondence between the voltage signal and the frequency signal or the time interval during which the voltage-frequency conversion module outputs a frequency signal with a frequency of zero or a fixed value is used to determine whether the intrinsically safe type pressure sensor for mine use matches the associated device.

2. The intrinsically safe type pressure sensor for mine use with an anti-counterfeiting function according to claim 1, characterized in that: The intrinsically safe type pressure sensor for mine use with an anti-counterfeiting function is externally provided with a sensor signal acquisition module; the sensor signal acquisition module is used to acquire the voltage signal output by the physical quantity and electrical signal conversion module and the frequency signal output by the voltage-frequency conversion module, establish a correspondence between the voltage signal and the frequency signal, and determine whether the correspondence between the voltage signal and the frequency signal meets a preset correspondence; if the correspondence between the voltage signal and the frequency signal does not meet the preset correspondence, it is determined that the intrinsically safe type pressure sensor for mine use does not match the associated device; if the correspondence between the voltage signal and the frequency signal meets the preset correspondence, it is determined that the intrinsically safe type pressure sensor for mine use matches the associated device.

3. The intrinsically safe type pressure sensor for mine use with anti-counterfeiting function according to claim 1, characterized in that: The intrinsically safe type pressure sensor for mine use with an anti-counterfeiting function is externally provided with a sensor signal acquisition module; the sensor signal acquisition module is used to acquire the time interval during which the voltage-frequency conversion module outputs a frequency signal with a frequency of zero or a fixed value, and determine whether the time interval meets a preset time interval; if the time interval does not meet the preset time interval, it is determined that the intrinsically safe type pressure sensor for mine use does not match the associated device; if the time interval meets the preset time interval, it is determined that the intrinsically safe type pressure sensor for mine use matches the associated device.

4. The intrinsically safe type pressure sensor for mine use with anti-counterfeiting function according to claim 2 or 3, characterized in that: The sensor signal acquisition module is further used to emit a warning signal and control the associated device to stop when it is determined that the intrinsically safe type pressure sensor for mine use does not match the associated device.

5. The intrinsically safe type pressure sensor for mine use with anti-counterfeiting function according to any one of claims 1 to 3, characterized in that: The physical quantity and electrical signal conversion module includes a pressure sensing bridge for sensing the physical quantity of pressure and a signal conditioning chip for converting the sensed physical quantity of pressure into a voltage signal. One bridge input terminal of the pressure sensing bridge is connected to the bridge drive pin of the signal conditioning chip, and the other bridge input terminal of the pressure sensing bridge is grounded. The two bridge output terminals of the pressure sensing bridge are respectively connected to the positive and negative data signal input pins of the signal conditioning chip. The negative power supply voltage pin of the signal conditioning chip is connected to the power supply, and the negative power supply voltage pin of the signal conditioning chip is also grounded through a parallel-connected tenth capacitor and eleventh capacitor. The positive power supply voltage pin of the signal conditioning chip and the positive power supply voltage pin of the EEPROM are both grounded through a ninth capacitor. The voltage signal output pin of the signal conditioning chip serves as the output terminal of the physical quantity and electrical signal conversion module for outputting the voltage signal.

6. The intrinsically safe type pressure sensor for mine use with anti-counterfeiting function according to claim 5, characterized in that: The physical quantity and electrical signal conversion module further includes a low-pass filter for filtering the voltage signal output from the voltage signal output pin of the signal conditioning chip. The low-pass filter includes a seventh resistor and a twelfth capacitor. One end of the seventh resistor is connected to the voltage signal output pin of the signal conditioning chip, the other end of the seventh resistor is grounded through the twelfth capacitor, and the other end of the seventh resistor is also used for outputting the filtered voltage signal.

7. The intrinsically safe type pressure sensor for mine use with anti-counterfeiting function according to any one of claims 1 to 3, characterized in that: The voltage-frequency conversion module includes a voltage-frequency conversion chip and a crystal oscillator. The input terminal of the crystal oscillator is connected to the clock output pin of the voltage-frequency conversion chip, the output terminal of the crystal oscillator is connected to the clock input pin of the voltage-frequency conversion chip. The input terminal of the crystal oscillator is also grounded through a third capacitor, and the output terminal of the crystal oscillator is also grounded through a fourth capacitor. The reference power supply pin of the voltage-frequency conversion chip is connected to the power supply, and the reference power supply pin of the voltage-frequency conversion chip is also grounded through a seventh capacitor. The buffer power supply pin and the power supply pin of the voltage-frequency conversion chip are both connected to the power supply, and the buffer power supply pin and the power supply pin of the voltage-frequency conversion chip are also both grounded through a sixth capacitor. The signal input pin of the voltage-frequency conversion chip serves as the input terminal of the voltage-frequency conversion module for receiving the voltage signal. The signal output pin of the voltage-frequency conversion chip is connected to one end of a fourth resistor, and the other end of the fourth resistor is grounded through a fifth capacitor. The other end of the fourth resistor serves as the output terminal of the voltage-frequency conversion module for outputting the frequency signal.

8. The intrinsically safe type pressure sensor for mine use with anti-counterfeiting function according to any one of claims 1 to 3, characterized in that: The timing module includes a timing chip. The power supply pin and the enable pin of the timing chip are both connected to the power supply. The power supply pin of the timing chip is also grounded through an eighth capacitor. The delay pin of the timing chip is grounded through a fifth resistor. The output pin of the timing chip is used to output the low level. The output pin of the timing chip is connected to the input end of the voltage-frequency conversion module. The output pin of the timing chip is also connected to the output end of the physical quantity and electrical signal conversion module through a sixth resistor.

9. The intrinsically safe type pressure sensor for mine use with anti-counterfeiting function according to any one of claims 1 to 3, characterized in that: The intrinsically safe type pressure sensor for mine use with anti-counterfeiting function further includes a sensor power supply module, which is used to supply power to the physical quantity and electrical signal conversion module, the voltage-frequency conversion module, and the timing module.

10. The intrinsically safe type pressure sensor for mine use with anti-counterfeiting function according to claim 9, characterized in that: The sensor power supply module includes a voltage conversion chip. The power input pin of the voltage conversion chip is connected to an external power supply. The power input pin of the voltage conversion chip is also grounded through a second capacitor. The enable pin of the voltage conversion chip is connected to the external power supply through a second resistor. The power output pin of the voltage conversion chip is used to output the power supply for supplying power to the physical quantity and electrical signal conversion module, the voltage-frequency conversion module, and the timing module. The power output pin of the voltage conversion chip is also grounded through a first capacitor. The power output pin of the voltage conversion chip is also connected to the voltage adjustment pin of the voltage conversion chip through a first resistor. The voltage adjustment pin of the voltage conversion chip is also grounded through a third resistor.

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