An anti-counterfeiting detection method and circuit for an intrinsically safe pressure sensor for mining

Abstract

The present invention relates to an anti-counterfeiting detection method and circuit for an intrinsically safe pressure sensor for use in a mine. The anti-counterfeiting detection method includes collecting an electrical signal output by a sensor and determining whether a frequency signal output by the sensor is collected at the same time; if not, a warning is issued that the sensor does not match an associated device; if so, determining whether the relationship between the electrical signal and the frequency signal conforms to a calibration ratio; if not, a warning is issued that the sensor does not match an associated device; if so, calculating the duration of the frequency signal being zero or a fixed value, and comparing the calculated time with the calibration time; if not, a warning is issued that the sensor does not match an associated device; if matching, determining that the sensor matches the associated device. In the present invention, by collecting the electrical signal and the frequency signal output by the sensor, it is possible to determine whether the sensor matches the associated device, thereby avoiding the huge safety hazards brought to coal mines by using counterfeit and inferior sensors.

Description

Technical Field

[0001] The invention relates to the field of sensors, and in particular to an anti-counterfeiting detection method and circuit for an intrinsically safe pressure sensor for mining. Background Art

[0002] Pressure sensors are the most widely used sensors in mining equipment, and are mainly used to measure fluid pressure, gas pressure, etc. in mining equipment. For intrinsically safe pressure sensors for mining, the circuit design must meet coal safety standards, and there are strict regulations on parameters such as maximum operating voltage, operating current, load capacitance, and load inductance. The equipment that matches it must also be inspected with the sensor before it can be used underground. In order to avoid the huge safety hazards to coal mines caused by the use of ordinary pressure sensors that have not been inspected underground, a mining intrinsically safe pressure sensor with anti-counterfeiting measures has been developed. However, how to detect the output signal of the mining intrinsically safe pressure sensor with anti-counterfeiting measures is a problem that needs to be solved urgently. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an anti-counterfeiting detection method and circuit for an intrinsically safe pressure sensor for mining.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: an anti-counterfeiting detection method for an intrinsically safe pressure sensor for mining, wherein the intrinsically safe pressure sensor for mining outputs an electrical signal and a frequency signal; wherein the electrical signal is formed by signal conversion and conditioning of the pressure physical quantity sensed by the intrinsically safe pressure sensor for mining, and the frequency signal is converted from the electrical signal that is short-circuited to the ground at a fixed time; when the electrical signal is short-circuited to the ground, the frequency signal output by the intrinsically safe pressure sensor for mining is zero or a fixed value; when the electrical signal is not short-circuited to the ground, the frequency signal output by the intrinsically safe pressure sensor for mining is proportional to the electrical signal;

[0005] The anti-counterfeiting detection method comprises the following steps:

[0006] When using for the first time:

[0007] Powering on the intrinsically safe pressure sensor for mining, collecting the electrical signal and frequency signal output by the intrinsically safe pressure sensor for mining, obtaining the duration of the frequency signal being zero or a fixed value and storing it as the calibration time; and calibrating the proportional relationship between the electrical signal and the frequency signal output by the intrinsically safe pressure sensor for mining to obtain a calibration proportional relationship;

[0008] In normal use:

[0009] Installing the intrinsically safe pressure sensor for mining on associated equipment, collecting the electrical signal output by the intrinsically safe pressure sensor for mining, and determining whether the frequency signal output by the intrinsically safe pressure sensor for mining is collected at the same time;

[0010] If the frequency signal is not collected, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment, and the associated equipment is controlled to shut down;

[0011] If the frequency signal is collected, determining whether the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship;

[0012] If the relationship between the collected electrical signal and the frequency signal does not conform to the calibration ratio relationship, a warning is issued that the mining intrinsically safe pressure sensor does not match the associated equipment and the associated equipment is controlled to shut down;

[0013] If the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship, the duration of the frequency signal being zero or a fixed value is calculated based on the collected frequency signal, and the calculated time is compared with the calibration time stored during initial use;

[0014] If the calculated time does not match the calibration time stored during initial use, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment, and the associated equipment is controlled to shut down;

[0015] If the calculated time matches the calibration time stored during initial use, it is determined that the intrinsically safe pressure sensor for mining matches the associated equipment.

[0016] Based on the above technical solution, the present invention can also be improved as follows.

[0017] Furthermore, the electrical signal is short-circuited to the ground at a fixed time by outputting a low level at a fixed time to act on the electrical signal.

[0018] Furthermore, the electrical signal is a voltage signal or a current signal.

[0019] Based on the above-mentioned anti-counterfeiting detection method of an intrinsically safe pressure sensor for use in a mine, the present invention also provides an anti-counterfeiting detection circuit of an intrinsically safe pressure sensor for use in a mine.

[0020] An anti-counterfeiting detection circuit for an intrinsically safe pressure sensor for use in a mine, the anti-counterfeiting detection circuit being applied to the anti-counterfeiting detection method for the intrinsically safe pressure sensor for use in a mine as described above, comprising a frequency signal acquisition circuit, an electrical signal acquisition circuit and a main control chip;

[0021] The frequency signal acquisition circuit is used to collect the frequency signal output by the mining intrinsically safe pressure sensor;

[0022] The electrical signal acquisition circuit is used to collect the electrical signal output by the mining intrinsically safe pressure sensor;

[0023] The main control chip is used to obtain the duration of the frequency signal being zero or a fixed value through the collected frequency signal during initial use and store it as a calibration time; and at the same time, calibrate the proportional relationship between the electrical signal output by the intrinsically safe pressure sensor for mining and the frequency signal to obtain a calibration proportional relationship;

[0024] The main control chip is also used to determine, during normal use, whether the frequency signal output by the intrinsically safe pressure sensor for mining is collected while the electrical signal output by the intrinsically safe pressure sensor for mining is collected; if the frequency signal is not collected, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment and the associated equipment is controlled to shut down; if the frequency signal is collected, it is determined whether the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship; if the relationship between the collected electrical signal and the frequency signal does not conform to the calibration ratio relationship, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment. A warning is issued for mismatch with associated equipment and the associated equipment is controlled to shut down; if the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship, the duration of the frequency signal being zero or a fixed value is calculated through the collected frequency signal, and the calculated time is compared with the calibration time stored at the time of initial use; if the calculated time does not match the calibration time stored at the time of initial use, a warning is issued for mismatch between the intrinsically safe pressure sensor for mining and the associated equipment and the associated equipment is controlled to shut down; if the calculated time matches the calibration time stored at the time of initial use, it is determined that the intrinsically safe pressure sensor for mining matches the associated equipment.

[0025] Based on the above technical solution, the present invention can also be improved as follows.

[0026] Further, the frequency signal acquisition circuit includes a Schmitt trigger, a first resistor, a second resistor, a first capacitor and a second capacitor; the input end of the Schmitt trigger is grounded through the first capacitor, the input end of the Schmitt trigger is also connected to one end of the first resistor, the other end of the first resistor is connected to the frequency signal output end of the mining intrinsically safe pressure sensor, the other end of the first resistor is also grounded through the second capacitor, the other end of the first resistor is also connected to the power supply voltage through the second resistor, the power supply end of the Schmitt trigger is connected to the power supply voltage, the ground end of the Schmitt trigger is grounded, and the output end of the Schmitt trigger is connected to the frequency signal input end of the main control chip.

[0027] Further, the electrical signal acquisition circuit includes a diode pair, a programmable amplifier, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a third resistor and a fourth resistor; the diode pair is composed of two first diodes and a second diode connected in series in the same direction, the positive electrode of the first diode is connected to the negative electrode of the second diode, the positive electrode of the second diode is grounded, and the negative electrode of the first diode is connected to the power supply voltage; the input end of the programmable amplifier is connected to the positive electrode of the first diode and the negative electrode of the second diode, the input end of the programmable amplifier is also connected to one end of the third resistor, and the other end of the third resistor is connected to the intrinsically safe pressure sensor for mining. The electrical signal output end of the sensor is connected, the other end of the third resistor is also grounded through the fourth resistor, the other end of the third resistor is also grounded through the third capacitor, the input end of the programmable amplifier is also grounded through the fourth capacitor, the grounding end of the programmable amplifier is grounded through the fifth capacitor, the negative power supply voltage end of the programmable amplifier is grounded, the positive power supply voltage end of the programmable amplifier is connected to the power supply voltage, the positive power supply voltage end of the programmable amplifier is also grounded through the sixth capacitor, the gain control end of the programmable amplifier is connected to the gain control output end of the main control chip, and the output end of the programmable amplifier is connected to the electrical signal input end of the main control chip.

[0028] Furthermore, the anti-counterfeiting detection circuit also includes a power supply circuit for supplying power to the frequency signal acquisition circuit, the electrical signal acquisition circuit and the main control chip.

[0029] Further, the power supply circuit includes a voltage-adjustable LDO power supply chip, a third diode, a fourth diode, a seventh capacitor, an eighth capacitor, a ninth capacitor, a fifth resistor, a sixth resistor and a seventh resistor; the positive electrode of the third diode is connected to the external power supply, the negative electrode of the third diode is connected to the positive electrode of the fourth diode, the negative electrode of the fourth diode is grounded through the seventh capacitor, the negative electrode of the fourth diode is also connected to the input end of the LDO power supply chip, the grounding end of the LDO power supply chip is grounded, the shutdown control end of the LDO power supply chip is also grounded through the seventh capacitor, the bypass capacitor end of the LDO power supply chip is grounded through the eighth capacitor, the adjustable voltage end of the LDO power supply chip is grounded through the fifth resistor, the output end of the LDO power supply chip is grounded through the sixth resistor and the fifth resistor in sequence, the output end of the LDO power supply chip is also grounded through the ninth capacitor, the output end of the LDO power supply chip is also connected to one end of the seventh resistor, and the other end of the seventh resistor is used to output the power supply voltage for powering the frequency signal acquisition circuit, the electrical signal acquisition circuit and the main control chip.

[0030] The beneficial effect of the present invention is that in the anti-counterfeiting detection method and circuit of the intrinsically safe pressure sensor for mining of the present invention, by collecting the output electrical signal and frequency signal of the intrinsically safe pressure sensor for mining, it can be determined whether the intrinsically safe pressure sensor for mining matches the associated equipment, thereby avoiding the huge safety hazards brought to coal mines by using counterfeit and inferior pressure sensors. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the output signal of a mining intrinsically safe pressure sensor with anti-counterfeiting measures;

[0032] Figure 2 This is a flow chart of an anti-counterfeiting detection method for an intrinsically safe pressure sensor for use in a mine according to the present invention;

[0033] Figure 3 It is a structural block diagram of an anti-counterfeiting detection circuit of an intrinsically safe pressure sensor for mining use according to the present invention;

[0034] Figure 4 This is a structural principle diagram of an anti-counterfeiting detection circuit of an intrinsically safe pressure sensor for mining use according to the present invention;

[0035] Figure 5 This is the structural schematic diagram of the power supply circuit. DETAILED DESCRIPTION

[0036] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0037] In order to avoid the huge safety hazards brought to coal mines by the use of ordinary pressure sensors that have not undergone joint inspection underground, a mine-used intrinsically safe pressure sensor with anti-counterfeiting measures has been developed that outputs an electrical signal and a frequency signal; wherein, the electrical signal is formed by signal conversion and conditioning of the pressure physical quantity sensed by the mine-used intrinsically safe pressure sensor, and the frequency signal is converted from the electrical signal that is short-circuited to the ground at a certain time; when the electrical signal is short-circuited to the ground, the frequency signal output by the mine-used intrinsically safe pressure sensor is zero or a fixed value; when the electrical signal is not short-circuited to the ground, the frequency signal output by the mine-used intrinsically safe pressure sensor is proportional to the electrical signal. The output signal of the mine-used intrinsically safe pressure sensor with anti-counterfeiting measures is as follows: Figure 1 As shown: Figure 1 The curve in the middle and upper part is the electrical signal output by the intrinsically safe pressure sensor for mining according to the applied pressure. The electrical signal in this specific embodiment is specifically a voltage signal (in other embodiments, the electrical signal can also be a current signal). The voltage signal amplitude is different for different pressures. Figure 1 The square wave in the lower middle is the frequency signal converted by the intrinsically safe pressure sensor for mining according to the amplitude of the voltage signal. During the time period marked by the timer, the output frequency value is zero (it can also be a fixed value in other embodiments); Figure 1 In the process, the frequency signal is directly proportional to the voltage signal. The larger the voltage, the higher the frequency. The maximum frequency range can reach 1MHz. The Timer time is set by the internal circuit of the mining intrinsically safe pressure sensor and can be freely set according to the factory time of the mining intrinsically safe pressure sensor, the user, and the matching system.

[0038] In this specific embodiment, the method for making the electrical signal short-circuited to the ground at a fixed time is to output a low level at a fixed time to act on the electrical signal so that the electrical signal is short-circuited to the ground at a fixed time. Specifically, Figure 1 As shown, during the time period marked by the timer, a low level is output to short-circuit the electrical signal to the ground, and the frequency signal output by the mining intrinsically safe pressure sensor is zero.

[0039] The present application is directed to a signal detection method and circuit for a mining intrinsically safe pressure sensor with anti-counterfeiting measures developed above.

[0040] like Figure 2 As shown, a method for detecting anti-counterfeiting of an intrinsically safe pressure sensor for use in a mine comprises the following steps:

[0041] When using for the first time:

[0042] Powering on the intrinsically safe pressure sensor for mining, collecting the electrical signal and frequency signal output by the intrinsically safe pressure sensor for mining, obtaining the duration of the frequency signal being zero or a fixed value and storing it as the calibration time; and calibrating the proportional relationship between the electrical signal and the frequency signal output by the intrinsically safe pressure sensor for mining to obtain a calibration proportional relationship;

[0043] In normal use:

[0044] Installing the intrinsically safe pressure sensor for mining on associated equipment, collecting the electrical signal output by the intrinsically safe pressure sensor for mining, and determining whether the frequency signal output by the intrinsically safe pressure sensor for mining is collected at the same time;

[0045] If the frequency signal is not collected, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment, and the associated equipment is controlled to shut down;

[0046] If the frequency signal is collected, determining whether the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship;

[0047] If the relationship between the collected electrical signal and the frequency signal does not conform to the calibration ratio relationship, a warning is issued that the mining intrinsically safe pressure sensor does not match the associated equipment and the associated equipment is controlled to shut down;

[0048] If the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship, the duration of the frequency signal being zero or a fixed value is calculated based on the collected frequency signal, and the calculated time is compared with the calibration time stored during initial use;

[0049] If the calculated time does not match the calibration time stored during initial use, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment, and the associated equipment is controlled to shut down;

[0050] If the calculated time matches the calibration time stored during initial use, it is determined that the intrinsically safe pressure sensor for mining matches the associated equipment.

[0051] Based on the above-mentioned anti-counterfeiting detection method of an intrinsically safe pressure sensor for use in a mine, the present invention also provides an anti-counterfeiting detection circuit of an intrinsically safe pressure sensor for use in a mine.

[0052] like Figure 3 As shown, an anti-counterfeiting detection circuit of an intrinsically safe pressure sensor for use in a mine, the anti-counterfeiting detection circuit is applied to the anti-counterfeiting detection method of the intrinsically safe pressure sensor for use in a mine as described above, comprising a frequency signal acquisition circuit, an electrical signal acquisition circuit and a main control chip;

[0053] The frequency signal acquisition circuit is used to collect the frequency signal output by the mining intrinsically safe pressure sensor;

[0054] The electrical signal acquisition circuit is used to collect the electrical signal output by the mining intrinsically safe pressure sensor;

[0055] The main control chip is used to obtain the duration of the frequency signal being zero or a fixed value through the collected frequency signal during initial use and store it as a calibration time; and at the same time, calibrate the proportional relationship between the electrical signal output by the intrinsically safe pressure sensor for mining and the frequency signal to obtain a calibration proportional relationship;

[0056] The main control chip is also used to determine, during normal use, whether the frequency signal output by the intrinsically safe pressure sensor for mining is collected while the electrical signal output by the intrinsically safe pressure sensor for mining is collected; if the frequency signal is not collected, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment and the associated equipment is controlled to shut down; if the frequency signal is collected, it is determined whether the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship; if the relationship between the collected electrical signal and the frequency signal does not conform to the calibration ratio relationship, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment. A warning is issued for mismatch with associated equipment and the associated equipment is controlled to shut down; if the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship, the duration of the frequency signal being zero or a fixed value is calculated through the collected frequency signal, and the calculated time is compared with the calibration time stored at the time of initial use; if the calculated time does not match the calibration time stored at the time of initial use, a warning is issued for mismatch between the intrinsically safe pressure sensor for mining and the associated equipment and the associated equipment is controlled to shut down; if the calculated time matches the calibration time stored at the time of initial use, it is determined that the intrinsically safe pressure sensor for mining matches the associated equipment.

[0057] In this specific embodiment, Figure 4As shown: the frequency signal acquisition circuit includes a Schmitt trigger U1, a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2; the input end of the Schmitt trigger U1 is grounded through the first capacitor C1, the input end of the Schmitt trigger U1 is also connected to one end of the first resistor R1, the other end of the first resistor R1 is connected to the frequency signal output end of the mining intrinsically safe pressure sensor, the other end of the first resistor R1 is also grounded through the second capacitor C2, the other end of the first resistor R1 is also connected to the power supply voltage VCC through the second resistor R2, the power supply end of the Schmitt trigger U1 is connected to the power supply voltage VCC, the ground end of the Schmitt trigger U1 is grounded, and the output end of the Schmitt trigger U1 is connected to the frequency signal input end of the main control chip.

[0058] exist Figure 4 In the figure, I_S_PRE is the frequency signal output by the intrinsically safe pressure sensor for mining, the second capacitor C2 is a filter capacitor, which is connected to the Schmitt trigger U1 for shaping after passing through the low-pass filter composed of the first resistor R1 and the first capacitor C1 to improve the anti-interference ability of the frequency signal; the second resistor R2 is a pull-up resistor at the frequency signal input end, which provides current for the frequency signal output by the intrinsically safe pressure sensor for mining, increases the anti-interference ability, and when the intrinsically safe pressure sensor for mining has no I_S_PRE signal output, the frequency signal acquisition circuit acquires a fixed low level.

[0059] In this specific embodiment, Figure 4As shown: the electrical signal acquisition circuit includes a diode pair, a programmable amplifier U2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a third resistor R3 and a fourth resistor R4; the diode pair is composed of two first diodes D1 and a second diode D2 connected in series in the same direction, the positive electrode of the first diode D1 is connected to the negative electrode of the second diode D2, the positive electrode of the second diode D2 is grounded, and the negative electrode of the first diode D1 is connected to the power supply voltage VCC; the input terminal IN of the programmable amplifier U2 is connected to the positive electrode of the first diode D1 and the negative electrode of the second diode D2, the input terminal IN of the programmable amplifier U2 is also connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the intrinsically safe pressure sensor for mining The electrical signal output end of the program-controlled amplifier U2 is connected, the other end of the third resistor R3 is also grounded through the fourth resistor R4, the other end of the third resistor R3 is also grounded through the third capacitor C3, the input end IN of the program-controlled amplifier U2 is also grounded through the fourth capacitor C4, the ground end AGND of the program-controlled amplifier U2 is grounded through the fifth capacitor C5, the negative power supply voltage end V- of the program-controlled amplifier U2 is grounded, the positive power supply voltage end V+ of the program-controlled amplifier U2 is connected to the power supply voltage VCC, the positive power supply voltage end V+ of the program-controlled amplifier U2 is also grounded through the sixth capacitor C6, the gain control end of the program-controlled amplifier U2 is connected to the gain control output end of the main control chip, and the output end OUT of the program-controlled amplifier U2 is connected to the electrical signal input end of the main control chip.

[0060] exist Figure 4 In the figure, I_V_PRE is the voltage signal output by the intrinsically safe pressure sensor for mining, which is filtered by the low-pass filter composed of the third resistor R3 and the fourth capacitor C4 and connected to the program-controlled amplifier U2 after the diode is embedded; the third capacitor C3, the fifth capacitor C5, and the sixth capacitor C6 are all filter capacitors; in this embodiment, the program-controlled amplifier U2 has three gain control terminals, namely G0, G1, and G2, and I_S_G0, I_S_G1, and I_S_G2 are the program-controlled amplification signals output by the main control chip, according to the intrinsically safe pressure sensor for mining. The signal output amplitude can flexibly configure the amplification factor of the programmable amplifier through the main control chip to improve the sampling accuracy. In other embodiments, I_V_PRE can also be the current signal output by the intrinsically safe pressure sensor for mining. The current signal is sampled through the fourth resistor R4. When collecting smaller current signals, in order to ensure the collection accuracy, the sampling resistor should not be too large. Therefore, the voltage value on the fourth resistor R4 is small. At this time, the amplification factor of the programmable amplifier U2 can be set through the main control chip to amplify the voltage signal output by the programmable amplifier U2 to a reasonable range.

[0061] In this specific embodiment, Figure 3As shown: the anti-counterfeiting detection circuit also includes a power supply circuit for supplying power to the frequency signal acquisition circuit, the electrical signal acquisition circuit and the main control chip.

[0062] In this specific embodiment, Figure 5 As shown: the power supply circuit includes a voltage-adjustable LDO power supply chip U3, a third diode D3, a fourth diode D4, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7; the anode of the third diode D3 is connected to the external power supply, the cathode of the third diode D3 is connected to the anode of the fourth diode D4, the cathode of the fourth diode D4 is grounded through the seventh capacitor C7, the cathode of the fourth diode D4 is also connected to the input terminal IN of the LDO power supply chip U3, the ground terminal of the LDO power supply chip U3 is grounded, and the shutdown control terminal of the LDO power supply chip U3 is The LDO power chip U3 is also grounded through the seventh capacitor C7, the bypass capacitor terminal BYP of the LDO power chip U3 is grounded through the eighth capacitor C8, the adjustable voltage terminal ADJ of the LDO power chip U3 is grounded through the fifth resistor R5, the output terminal OUT of the LDO power chip U3 is grounded through the sixth resistor R6 and the fifth resistor R5 in sequence, the output terminal OUT of the LDO power chip U3 is also grounded through the ninth capacitor C9, the output terminal OUT of the LDO power chip U3 is also connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is used to output the power supply voltage VCC for powering the frequency signal acquisition circuit, the electrical signal acquisition circuit and the main control chip.

[0063] Since the intrinsically safe pressure sensor for mining is an intrinsically safe device, its signal detection circuit must also meet the requirements of the intrinsically safe circuit. The signal detection circuit is a micro-power circuit, so the power supply circuit that supplies power to the signal detection circuit can adopt a simple capacitor circuit model in the intrinsically safe circuit, and add a current limiting resistor at the output end of the power supply to save the isolation power supply and the two-stage voltage and current limiting protection circuit, saving costs. Figure 5In the figure, POWER_IN is the input terminal of the power circuit, which is connected to the input terminal of the LDO power chip U3 after passing through the third diode D3 and the fourth diode D4. The third diode D3 and the fourth diode D4 can ensure that the frequency signal acquisition circuit and the internal capacitors, inductors and other energy storage elements of the electrical signal acquisition circuit will not discharge to the outside and make the intrinsic safety circuit invalid. The LDO power chip U3 adopts an LDO power chip with adjustable output voltage. The ninth capacitor C9 is the output capacitor, and its capacity is less than 3.3uF. The fifth resistor R5 and the sixth resistor R6 are the output voltage feedback network. By adjusting the resistance value, the output voltage of the LDO power chip U3 is set. The seventh resistor R7 is an output current limiting resistor. The resistor power is selected according to the POWER_IN input voltage. The resistance value ensures that when the LDO power chip U3 fails, the power circuit still meets the requirements of the intrinsic safety circuit.

[0064] In the anti-counterfeiting detection method and circuit of an intrinsically safe pressure sensor for mining of the present invention, by collecting the output electrical signal and frequency signal of the intrinsically safe pressure sensor for mining, it can be determined whether the intrinsically safe pressure sensor for mining matches the associated equipment, thereby avoiding the huge safety hazards brought to coal mines by using counterfeit and inferior pressure sensors.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-counterfeiting detection method for an intrinsically safe pressure sensor for mining, characterized in that: The mine-used intrinsically safe pressure sensor outputs an electrical signal and a frequency signal; wherein the electrical signal is formed by signal conversion and conditioning of the pressure physical quantity sensed by the mine-used intrinsically safe pressure sensor, and the frequency signal is converted from the electrical signal that is short-circuited to the ground at a fixed time; when the electrical signal is short-circuited to the ground, the frequency signal output by the mine-used intrinsically safe pressure sensor is zero or a fixed value; when the electrical signal is not short-circuited to the ground, the frequency signal output by the mine-used intrinsically safe pressure sensor is proportional to the electrical signal; The anti-counterfeiting detection method comprises the following steps: When using for the first time: Powering on the intrinsically safe pressure sensor for mining, collecting the electrical signal and frequency signal output by the intrinsically safe pressure sensor for mining, obtaining the duration of the frequency signal being zero or a fixed value and storing it as the calibration time; and calibrating the proportional relationship between the electrical signal and the frequency signal output by the intrinsically safe pressure sensor for mining to obtain a calibration proportional relationship; In normal use: Installing the intrinsically safe pressure sensor for mining on associated equipment, collecting the electrical signal output by the intrinsically safe pressure sensor for mining, and determining whether the frequency signal output by the intrinsically safe pressure sensor for mining is collected at the same time; If the frequency signal is not collected, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment, and the associated equipment is controlled to shut down; If the frequency signal is collected, determining whether the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship; If the relationship between the collected electrical signal and the frequency signal does not conform to the calibration ratio relationship, a warning is issued that the mining intrinsically safe pressure sensor does not match the associated equipment and the associated equipment is controlled to shut down; If the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship, the duration of the frequency signal being zero or a fixed value is calculated based on the collected frequency signal, and the calculated time is compared with the calibration time stored during initial use; If the calculated time does not match the calibration time stored during initial use, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment, and the associated equipment is controlled to shut down; If the calculated time matches the calibration time stored during initial use, it is determined that the intrinsically safe pressure sensor for mining matches the associated equipment.

2. The anti-counterfeiting detection method of the intrinsically safe pressure sensor for mining according to claim 1 is characterized in that: The electrical signal is short-circuited to the ground by timely outputting a low level to the electrical signal.

3. The anti-counterfeiting detection method of the intrinsically safe pressure sensor for mining according to claim 1 is characterized in that: The electrical signal is a voltage signal or a current signal. 4.An anti-counterfeiting detection circuit for an intrinsically safe pressure sensor for mining, characterized in that: The anti-counterfeiting detection circuit is applied to the anti-counterfeiting detection method of the intrinsically safe pressure sensor for mining as claimed in any one of claims 1 to 3, comprising a frequency signal acquisition circuit, an electrical signal acquisition circuit and a main control chip; The frequency signal acquisition circuit is used to collect the frequency signal output by the mining intrinsically safe pressure sensor; The electrical signal acquisition circuit is used to collect the electrical signal output by the mining intrinsically safe pressure sensor; The main control chip is used to obtain the duration of the frequency signal being zero or a fixed value through the collected frequency signal during initial use and store it as a calibration time; and at the same time, calibrate the proportional relationship between the electrical signal output by the intrinsically safe pressure sensor for mining and the frequency signal to obtain a calibration proportional relationship; The main control chip is also used to determine, during normal use, whether the frequency signal output by the intrinsically safe pressure sensor for mining is collected while the electrical signal output by the intrinsically safe pressure sensor for mining is collected; if the frequency signal is not collected, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment and the associated equipment is controlled to shut down; if the frequency signal is collected, it is determined whether the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship; if the relationship between the collected electrical signal and the frequency signal does not conform to the calibration ratio relationship, a warning is issued that the intrinsically safe pressure sensor for mining does not match the associated equipment. A warning is issued for mismatch with associated equipment and the associated equipment is controlled to shut down; if the relationship between the collected electrical signal and the frequency signal conforms to the calibration ratio relationship, the duration of the frequency signal being zero or a fixed value is calculated through the collected frequency signal, and the calculated time is compared with the calibration time stored at the time of initial use; if the calculated time does not match the calibration time stored at the time of initial use, a warning is issued for mismatch between the intrinsically safe pressure sensor for mining and the associated equipment and the associated equipment is controlled to shut down; if the calculated time matches the calibration time stored at the time of initial use, it is determined that the intrinsically safe pressure sensor for mining matches the associated equipment.

5. The anti-counterfeiting detection circuit of the intrinsically safe pressure sensor for mining use according to claim 4 is characterized in that: The frequency signal acquisition circuit includes a Schmitt trigger, a first resistor, a second resistor, a first capacitor and a second capacitor; the input end of the Schmitt trigger is grounded through the first capacitor, the input end of the Schmitt trigger is also connected to one end of the first resistor, the other end of the first resistor is connected to the frequency signal output end of the mining intrinsically safe pressure sensor, the other end of the first resistor is also grounded through the second capacitor, the other end of the first resistor is also connected to the power supply voltage through the second resistor, the power supply end of the Schmitt trigger is connected to the power supply voltage, the ground end of the Schmitt trigger is grounded, and the output end of the Schmitt trigger is connected to the frequency signal input end of the main control chip.

6. The anti-counterfeiting detection circuit of the intrinsically safe pressure sensor for mining use according to claim 4 is characterized in that: The electrical signal acquisition circuit includes a diode pair, a programmable amplifier, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a third resistor and a fourth resistor; the diode pair is composed of two first diodes and a second diode connected in series in the same direction, the positive electrode of the first diode is connected to the negative electrode of the second diode, the positive electrode of the second diode is grounded, and the negative electrode of the first diode is connected to the power supply voltage; the input end of the programmable amplifier is connected to the positive electrode of the first diode and the negative electrode of the second diode, the input end of the programmable amplifier is also connected to one end of the third resistor, and the other end of the third resistor is connected to the intrinsically safe pressure sensor for mining The electrical signal output terminal of the programmable amplifier is connected, the other end of the third resistor is also grounded through the fourth resistor, the other end of the third resistor is also grounded through the third capacitor, the input terminal of the programmable amplifier is also grounded through the fourth capacitor, the ground terminal of the programmable amplifier is grounded through the fifth capacitor, the negative power supply voltage terminal of the programmable amplifier is grounded, the positive power supply voltage terminal of the programmable amplifier is connected to the power supply voltage, the positive power supply voltage terminal of the programmable amplifier is also grounded through the sixth capacitor, the gain control terminal of the programmable amplifier is connected to the gain control output terminal of the main control chip, and the output terminal of the programmable amplifier is connected to the electrical signal input terminal of the main control chip.

7. The anti-counterfeiting detection circuit of the intrinsically safe pressure sensor for mining use according to claim 4 is characterized in that: The anti-counterfeiting detection circuit also includes a power supply circuit for supplying power to the frequency signal acquisition circuit, the electrical signal acquisition circuit and the main control chip.

8. The anti-counterfeiting detection circuit of the intrinsically safe pressure sensor for mining use according to claim 7 is characterized in that: The power supply circuit includes a voltage-adjustable LDO power supply chip, a third diode, a fourth diode, a seventh capacitor, an eighth capacitor, a ninth capacitor, a fifth resistor, a sixth resistor and a seventh resistor; the positive electrode of the third diode is connected to an external power supply, the negative electrode of the third diode is connected to the positive electrode of the fourth diode, the negative electrode of the fourth diode is grounded through the seventh capacitor, the negative electrode of the fourth diode is also connected to the input end of the LDO power supply chip, the grounding end of the LDO power supply chip is grounded, the shutdown control end of the LDO power supply chip is also grounded through the seventh capacitor, the bypass capacitor end of the LDO power supply chip is grounded through the eighth capacitor, the adjustable voltage end of the LDO power supply chip is grounded through the fifth resistor, the output end of the LDO power supply chip is grounded through the sixth resistor and the fifth resistor in sequence, the output end of the LDO power supply chip is also grounded through the ninth capacitor, the output end of the LDO power supply chip is also connected to one end of the seventh resistor, and the other end of the seventh resistor is used to output a power supply voltage for supplying power to the frequency signal acquisition circuit, the electrical signal acquisition circuit and the main control chip.

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