CN110618380A - Hall switch valve detection circuitry that targets in place - Google Patents

Abstract

The present invention relates to the field of smart gas meters, in particular to a Hall switch valve in-position detection circuit, comprising: a Hall sensor, used to detect the magnetic signal sent by the magnetic steel arranged on the valve, and output according to the detected magnetic signal In-position signal; the microprocessor connected to the Hall sensor circuit is used to send the valve opening drive signal or the valve closing drive signal to drive the valve to advance, and is also used to receive the in-position signal sent by the Hall sensor, and judge whether the valve is in place according to the in-position judgment signal. The valve is opened to the right position or the valve is closed to the right position; the power adapter circuit connected with the microprocessor and the Hall sensor circuit is used to receive the valve opening drive signal or the valve closing drive signal sent by the microprocessor. The distribution circuit supplies power to the Hall sensor and provides a reference ground connection for the Hall sensor circuit. The invention has the following beneficial effects: the detection of valve opening and closing positions is realized; the circuit structure is simple, and the cost of the product is reduced.

Description

A Hall switch valve in-position detection circuit

technical field

The invention relates to the field of intelligent gas meters, in particular to a Hall switch valve in-position detection circuit.

Background technique

With the improvement of people's living standards and quality of life, the demand for intelligent products required by modern families will promote the development of smart gas meters in the direction of safety, reliability, and smart convenience. At present, domestic smart gas meters mainly include IC card smart gas meters, CPU card smart gas meters, radio frequency card smart gas meters, wired remote meters, wireless remote meters, and Internet of Things smart gas meters. The application to realize the intelligentization of gas meters is not only the single-chip microcomputer chip, wired and wireless communication modules, but also a key component is the "gas meter motor valve". The smart gas meter can remotely control the opening or closing of its valve to realize the remote control of the opening and closing of the natural gas use of abnormal users' homes, so as to ensure the safe and reasonable use of natural gas.

In order to improve the safety and reliability of the smart gas meter, it is very important to detect the open or close position signal of the gas meter motor valve. If the valve is not closed in place, it will cause air leakage, which will bring great losses to the country and people's property; if the valve is not opened in place, it will not meet the normal use of the user's family. Therefore, whether the smart gas meter valve is opened or closed in place directly affects the product performance and quality of the smart gas meter.

The in-position detection device and its electronic circuit Hall sensor circuit used in the current industrial, commercial and domestic civil gas meters are mostly integrated with the motor valve to ensure the accuracy and timeliness of the detection. The currently used Hall switch valve in-position detection circuit uses the motor valve to drive the magnetic steel assembly on the connecting rod to move together. When the magnetic steel rotates to the magnetic operating point (BOP) of the Hall sensor, the Hall sensor output is triggered. The low-level signal is fed back to the single-chip microcomputer for processing, and it is judged that the valve closing position of the motor valve is in place, but the detection of the valve opening position of the valve cannot be realized. In addition, the power supply and reference ground used in the existing Hall sensor circuit are connected to the main control circuit board using separate wires, plus a signal line output by the Hall sensor, and two control valves for the motor valve switch valve. Wire, a total of 5 wires are used. The motor valve is connected to the main control circuit board through a wire harness. The drive signal line of the motor valve and the sensor detection circuit are designed separately from the main control circuit board. The connection with the main control circuit board uses multiple external wires to connect and perform data interaction. ; For electronic products, the more the number of external wires connecting the interactive signal lines, the more variable factors will lead to product failure; for mass-produced products, the more connecting wires, the higher the cost of connectors. It will increase needle by needle, thereby increasing the production cost, and at the same time reducing the efficiency of product production.

Contents of the invention

In order to solve the above problems, the present invention proposes a Hall switch valve in-position detection circuit to realize valve closing and valve opening in-position detection, and at the same time, there are fewer connecting wires and low cost.

A Hall switch valve in-position detection circuit, comprising:

The Hall sensor is used to detect the magnetic signal sent by the magnet set on the valve, and output the in-position signal according to the detected magnetic signal;

The microprocessor connected with the hall sensor circuit is used to send the valve opening drive signal or the valve closing drive signal to drive the valve to move forward, and is also used to receive the in-position signal from the Hall sensor, and judge whether the valve is in place according to the in-position judgment signal Or close the valve in place;

The power adapter circuit connected to the microprocessor and the Hall sensor circuit is used to receive the valve opening drive signal or the valve close drive signal sent by the microprocessor, and the microprocessor supplies power to the Hall sensor through the power adapter circuit, Also provide a reference ground connection for the Hall sensor circuit.

Preferably, the power adaptation circuit includes: transistors Q1, Q2, diodes D1, D2,

The base of the triode Q1 is connected to the microprocessor, the emitter of the triode Q1 is connected to the microprocessor, the collector of the triode Q1 is connected to the reference ground, the base of the triode Q2 is connected to the microprocessor, and the emitter of the triode Q2 is connected to the microprocessor. processor, the collector of the transistor Q2 is connected to the reference ground, the anode of the diode D1 is connected to the microprocessor, the cathode of the diode D1 is connected to the reference ground and the power input terminal of the Hall sensor circuit, and the anode of the diode D2 is connected to the microprocessor , the cathode of the diode D2 is connected to the reference ground and the power input terminal of the Hall sensor circuit.

Preferably, the power adaptation circuit further includes: resistors R1, R2, R3,

One end of the resistor R1 is connected to the microprocessor, the other end of the resistor R1 is connected to the base of the transistor Q1, one end of the resistor R2 is connected to the microprocessor, the other end of the resistor R2 is connected to the base of the transistor Q2, and the resistor R3 One end of the resistor R3 is connected to the cathode of the diode D1 and the cathode of the diode D2, and the other end of the resistor R3 is connected to the Hall sensor circuit.

Preferably, the Hall sensor circuit includes: a Hall sensor and a capacitor C1,

The power input terminal of the Hall sensor is connected to the output terminal of the power adapter circuit, the ground terminal of the Hall sensor is connected to the reference ground, the output terminal of the Hall sensor is connected to the microprocessor, and one end of the capacitor C1 is connected to the power input of the Hall sensor end, and the other end of capacitor C1 is connected to the ground end of the Hall sensor.

Preferably, the Hall sensor circuit includes: at least two Hall sensors installed in different orientations and the same number of capacitors as the Hall sensors,

The power input terminals of the Hall sensors are all connected to the output terminals of the power adapter circuit, the ground terminals of the Hall sensors are connected to the reference ground, the output terminals of the Hall sensors are connected to the microprocessor, and the power input terminals of the Hall sensors are connected to the Hall sensor. A capacitor is connected between the ground terminals of the sensor.

Preferably, it also includes: a level conversion module connected to the output end of the Hall sensor circuit, used for level conversion of the output of the Hall sensor circuit to the bit signal, and the output end of the level conversion module is connected to the microprocessor.

Preferably, the level shifting module includes: a first level shifting circuit having the same number as the Hall sensor, and the first level shifting circuit is connected to the output terminal of the Hall sensor, and is used for the Hall sensor to output an in-position signal The level conversion of the first level conversion circuit, the output end of the first level conversion circuit is connected to the microprocessor.

Preferably, the first level conversion circuit includes: a resistor R4 and a diode D3,

One end of the resistor R4 is connected to the power supply terminal, the other end of the resistor R4 is connected to the microprocessor and the anode of the diode D3, and the cathode of the diode D3 is connected to the output end of the Hall sensor.

Preferably, the level conversion module includes: a second level conversion circuit, the second level conversion circuit is connected to the output terminal of the Hall sensor, and is used for level conversion of the Hall sensor output to the position signal, and the The output end of the second level conversion circuit is connected to the microprocessor,

The second level conversion circuit includes: diodes D4, D5 and resistor R5, the cathode of the diode D4 is connected to the output terminal of the Hall sensor, the anode of the diode D5 is connected to the microprocessor, one end of the resistor R5 and the anode of the diode D5 , the other end of the resistor R5 is connected to the power supply end, and the cathode of the diode D5 is connected to the output end of the Hall sensor.

Preferably, it also includes: an output circuit having the same number as the Hall sensor, and the output circuit is connected to the output terminal of the Hall sensor, including: a resistor R6 and a capacitor C2,

One end of the resistor R6 is connected to the output end of the Hall sensor, the other end is connected to the microprocessor and one end of the capacitor C2, and the other end of the capacitor C2 is connected to the reference ground.

The present invention has the following beneficial effects:

1. The operation of the circuit is safe and reliable, and the number of connecting wires to the main control board is reduced. Only two driving signal wires and one output signal wire for the Hall sensor to detect the output after the valve is opened and closed are in place. , and connected to the microprocessor for signal processing, it is not necessary to connect the VCC power line and the GND reference ground line separately from the main control board, which reduces the variable factors of product failure and reduces the cost of the product. At the same time, the floating ground design is used to suppress the access of interference signals on the main control board and improve the anti-interference performance of the circuit.

2. Independent detection can be realized for the opening and closing of the valve. During the high-low level conversion of the driving signal output by the microprocessor, there will always be a high-level signal that conducts the forward diode, which is used for the rear Hall sensor. The circuit provides power to make it work;

3. The Hall sensor circuit is powered by the high-level voltage of the power adapter circuit directly, which can ensure the action response time of the Hall sensor. At the same time, when there is no driving signal, the Hall sensor has no working power. The static power consumption of the switch valve in-position detection circuit is zero power consumption, which improves the service life;

4. Add multiple Hall sensors to the Hall sensor circuit. The Hall sensors are placed in different orientations to detect the magnetism of the magnetic steel. The detection sensitivity can be improved from the detection of multiple spatial orientations, and the long-stroke distance can also be realized. Judgment of valve opening or closing in place signal;

5. The second level conversion circuit performs multiple judgments on the signal output by the Hall sensor circuit to realize two judgments on the valve in-position signal to prevent misjudgment.

Description of drawings

The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of module connection of a Hall switch valve in-position detection circuit according to an embodiment of the present invention;

Fig. 2 is a schematic circuit diagram of a power supply adaptation circuit and a Hall sensor circuit in a Hall switch valve in-position detection circuit according to an embodiment of the present invention;

3 is a schematic circuit diagram of a Hall switch valve in-position detection circuit in Embodiment 2 of the present invention;

Fig. 4 is a schematic circuit diagram of a Hall switch valve in-position detection circuit according to Embodiment 3 of the present invention;

5 is a schematic circuit diagram of a Hall switch valve in-position detection circuit according to Embodiment 4 of the present invention;

Fig. 6 is a schematic circuit diagram of a Hall switch valve in-position detection circuit according to Embodiment 5 of the present invention.

Detailed ways

The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

Embodiment one

The basic idea of Embodiment 1 of the present invention is to provide power supply and reference ground connection for the Hall sensor circuit through the power adapter circuit, and only keep the correspondence between the first drive signal and the second drive signal output by the microprocessor and the output signal of the Hall sensor circuit. The 3 wires reduce the variable factors of product failure and reduce the cost of the product; during the high-low level conversion of the drive signal output by the microprocessor, there will always be a high-level signal that conducts the forward diode, which is used for the later Hall The sensor circuit provides power to make it work, so as to realize the independent detection of the valve opening and closing position.

Based on the above ideas, Embodiment 1 of the present invention proposes a Hall switch valve in-position detection circuit, as shown in Figure 1, including: a Hall sensor, used to detect the magnetic signal sent by the magnetic steel installed on the valve, and according to The detected magnetic signal outputs an in-position signal; the microprocessor connected to the Hall sensor circuit is used to send a valve-opening drive signal or a valve-closing drive signal to drive the valve to advance, and is also used to receive the in-position signal sent by the Hall sensor. The in-position judgment signal judges whether the valve is fully opened or closed; the power adapter circuit connected to the microprocessor and the Hall sensor circuit is used to receive the valve-opening drive signal or the valve-closing drive signal sent by the microprocessor. The microprocessor supplies power to the Hall sensor through the power adapter circuit, and at the same time provides a reference ground connection for the Hall sensor circuit.

When the valve needs to be opened or closed, the microprocessor sends a drive signal to the power adapter circuit to open or close the valve; the power adapter circuit receives the drive signal sent by the microprocessor and uses the level voltage of the drive signal as the Huo Hall sensor power supply, while providing a reference ground connection for the Hall sensor circuit; at this time, the Hall sensor circuit directly uses the level voltage of the on or off drive signal output by the power adapter circuit as the power supply; when the valve travels to When the magnetic field of the magnetic steel can be sensed and the magnetic working point of the Hall sensor is reached, the Hall sensor circuit outputs an in-position signal, which is fed back to the microprocessor for processing. The microprocessor judges whether the valve is open or closed according to the in-position signal. When the valve is in place, the microprocessor stops sending the valve opening or closing command to the power adapter circuit at the same time, so the driving signal also disappears, the opening or closing action of the valve stops, and finally completes the in-position detection of the valve opening or closing.

The Hall sensor circuit and the power adaptation circuit will be described in detail below in conjunction with FIG. 2 .

The power supply adaptation circuit includes: transistors Q1, Q2, diodes D1, D2, resistors R1, R2, R3. The base of the transistor Q1 is connected to one end of the resistor R1, the other end of the resistor R1 is connected to the first drive signal FA_ON output by the microprocessor, the emitter of the transistor Q1 is connected to the second drive signal FA_OFF output by the microprocessor, and the collector of the transistor Q1 Connect to reference ground GND. The base of the transistor Q2 is connected to one end of the resistor R2, the other end of the resistor R2 is connected to the second drive signal FA_OFF output by the processor, the emitter of the transistor Q2 is connected to the first drive signal FA_ON output by the processor, and the collector of the transistor Q2 Connect to reference ground GND. The anode of the diode D1 is connected to the first drive signal FA_ON output by the processor, the cathode of the diode D1 is connected to one end of the resistor R3, and the other end of the resistor R3 is connected to the Hall sensor circuit. The anode of the diode D2 is connected to the second drive signal FA_OFF output by the processor, and the cathode of the diode D2 is connected to one end of the resistor R3.

The Hall sensor circuit includes a Hall sensor U1 and a capacitor C1. The power input terminal VCC of the Hall sensor U1 is connected to the output terminal of the resistor R3, the ground terminal GND of the Hall sensor is connected to the reference ground GND, and the output terminal Vout of the Hall sensor U1 is connected to the microprocessor. One end of the capacitor C1 is connected to the power input end of the Hall sensor, and the other end of the capacitor C1 is connected to the ground end of the Hall sensor for filtering.

When the microprocessor outputs the valve opening drive signal: the output of the first drive signal FA_ON is high level, and is connected to the base of the transistor Q1 through the current limiting resistor R1; the output of the second drive signal FA_OFF is low level, so the output of the transistor Q1 Transmitting a very low-level signal; when the first drive signal FA_ON is at a high level, the diode D1 is turned on, and the first drive signal FA_ON continues to be connected to the reference ground GND through the current limiting resistor R3 and the filter capacitor C1, and connected to the transistor Q1 At this time, the collector voltage signal of the transistor Q1 has a conduction voltage drop when the high-level signal of the first drive signal FA_ON passes through the diode D1, so its voltage is lower than the base voltage of the transistor Q1, but higher than that of the transistor Q1 Q1 emitter voltage value, so that the transistor Q1 transistor is in a saturated conduction state; the emitter voltage of the transistor Q2 is a high level signal due to the first drive signal FA_ON, and the base voltage of the transistor Q2 is low due to the second drive signal FA_OFF Flat signal, so the transistor Q2 is in the cut-off state. Therefore, when the network of the first drive signal FA_ON is at high level and the network of the second drive signal FA_OFF is at low level, the diode D1 conducts and the diode D2 does not conduct, and the high level signal is returned to the circuit through the current limiting resistor R3 and the filter capacitor C1. Hall sensor U1 is powered. At this time, if the valve is not running, when the magnetic field of the Hall sensor U1 is reached due to the induction of the magnetic field of the magnetic steel, the high-level signal output by the Hall sensor U1; When the magnetic working point of the Hall sensor U1 is reached, the Hall sensor U1 outputs a low-level signal, that is, the in-position signal. The microprocessor judges whether the valve is in place and controls the sending of the drive signal according to the signal output by the Hall sensor U1.

On the contrary, when the microprocessor outputs the valve closing drive signal: the difference from when the microprocessor outputs the valve opening drive signal is: the output of the first drive signal FA_ON is low level, and the output of the second drive signal FA_OFF is High level, so that the transistor Q1 is cut off, and the transistor Q2 is saturated and turned on; the diode D1 is cut off, and the diode D2 is forward-conducting, and supplies power to its subsequent circuit. Work.

In this embodiment, the circuit design of a Hall switch valve in-position detection circuit is simple, the circuit operation is safe and reliable, and the number of connecting wires with the main control board is reduced, and only the first drive signal FA_ON and the second drive signal are required. The two drive signal lines of FA_OFF and the output signal line detected by the Hall sensor U1 after the valve is opened and closed are in place, and connected to the microprocessor for signal processing, no need to be connected separately from the main control board The VCC power line and the GND reference ground line reduce the variable factors of product failure and reduce the cost of the product. At the same time, the floating ground design is used to suppress the access of interference signals on the main control board and improve the anti-interference performance of the circuit.

According to the first drive signal FA_ON and the second drive signal FA_OFF, a Hall switch valve in-position detection circuit in this embodiment can independently detect the opening and closing actions of the valve. The first drive signal FA_ON and the second drive signal During the high-to-low transition of FA_OFF, there will always be a high-level signal that turns on the forward diode to provide power for the subsequent Hall sensor circuit to make it work.

In this embodiment, the Hall sensor circuit in the Hall switch valve in-position detection circuit directly uses the high-level voltage of the power adapter circuit for power supply, which can ensure the action response time of the Hall sensor. At the same time, when there is no driving signal, the Hall sensor U1 has no working power, and at this time the static power consumption of the Hall switch valve position detection circuit is zero, which improves the service life.

Embodiment two

Embodiment 2 On the basis of Embodiment 1, multiple Hall sensors are added to the Hall sensor circuit. The Hall sensor is placed in different orientations to realize the detection of the magnetism of the magnetic steel, and the detection sensitivity of the detection is improved from the detection of multiple spatial orientations. In addition, for long-stroke valves with long opening and closing strokes that exceed the detection range of the magnetic characteristic operating point of the Hall sensor, at least two Hall sensors can be placed at the beginning and end of the valve's full stroke, and finally Realize the judgment of the long-stroke valve opening or closing in-position signal.

In this embodiment, the Hall sensor circuit includes two Hall sensors as an example for illustration. As shown in Figure 3, the Hall sensor circuit includes: two Hall sensors U1 and U1' installed in different orientations and the same number of capacitors C1 and C1' as the Hall sensors, and the power input terminals of the Hall sensors U1 and U1' VCC is connected to the output terminal of the power adapter circuit, the ground terminals GND of the Hall sensors U1 and U1' are connected to the reference ground, the output terminal Vout of the Hall sensor is connected to the microprocessor, and the power input terminal VCC of the Hall sensor is connected to the Hall sensor. A capacitor is connected between the ground terminals GND of the sensor.

For other content not described in this embodiment, reference may be made to the first embodiment above.

Embodiment Three

Embodiment 3 On the basis of Embodiment 2, the output terminal of the Hall sensor circuit is connected to a level conversion module for level conversion of the Hall sensor circuit output-to-position signal, and the output terminal of the level conversion module is connected to the microprocessor . The level conversion module includes: a first level conversion circuit having the same number as the Hall sensor, the first level conversion circuit is connected to the output terminal of the Hall sensor, and is used for the level conversion of the output signal of the Hall sensor, The output end of the first level conversion circuit is connected to the microprocessor. The output end of the Hall sensor is designed with a level conversion circuit, which can be directly applied to a circuit whose voltage value of the valve driving signal is different from the operating voltage of the microprocessor, expanding the application range.

As shown in Figure 4, a first level conversion circuit includes: a resistor R4 and a diode D3, one end of the resistor R4 is connected to the power supply terminal, the other end of the resistor R4 is connected to the microprocessor and the anode of the diode D3, the diode D3 The negative pole is connected to the output terminal of the Hall sensor. Another first level conversion circuit includes: a resistor R4' and a diode D3', one end of the resistor R4' is connected to the power supply terminal, the other end of the resistor R4' is connected to the microprocessor and the positive pole of the diode D3', and the negative pole of the diode D3' is connected to The output terminal of the Hall sensor.

When the microprocessor outputs the valve opening drive signal: if the valve is not running, when the magnetic working point of the Hall sensor U1 is reached due to the induction of the magnetic steel magnetic field, the high level signal output by the Hall sensor U1, and the diode D3 reverses the cut-off , but because the power supply terminal VCC is pulled up by the resistor R3, the level conversion circuit outputs a high-level signal, which is input to the microprocessor; , the low-level signal output by the Hall sensor U1, the diode D3 is turned on, so that the level conversion circuit outputs a low-level signal, and input to the microprocessor, the microprocessor performs signal processing and makes a judgment signal and control of valve opening in place Work.

When the microprocessor outputs the valve-off driving signal, the output signal of the level conversion circuit is opposite to that output when the microprocessor outputs the valve-opening driving signal, and its specific working process will not be repeated.

For other content not described in this embodiment, reference may be made to the second embodiment above.

Embodiment four

Embodiment 4 On the basis of Embodiment 2, the output terminal of the Hall sensor circuit is connected to a level conversion module for level conversion of the Hall sensor circuit output-to-position signal, and the output terminal of the level conversion module is connected to the microprocessor . The level conversion module includes: a second level conversion circuit, the second level conversion circuit is connected to the output terminal of the Hall sensor, and is used for the level conversion of the output signal of the Hall sensor, and the second level conversion circuit The output terminal of the circuit is connected with the microprocessor.

As shown in Figure 5, the second level conversion circuit includes: diodes D4, D5 and resistor R5, the cathode of diode D4 is connected to the output terminal of Hall sensor U1, the anode of diode D5 is connected to the microprocessor, one end of resistor R5 and the diode The anode of D5 is connected to the power supply terminal with the other end of the resistor R5, and the cathode of the diode D5 is connected to the output terminal of the Hall sensor U1'.

In this embodiment, the second level conversion circuit judges the signal output by the Hall sensor circuit twice, that is, judges the signals output by the Hall sensor U1 and U1' respectively, so as to realize the valve in-position signal twice. Judgment to prevent misjudgment.

For other content not described in this embodiment, reference may be made to the second embodiment above.

Embodiment five

Embodiment 5 On the basis of Embodiment 2, an output circuit is connected to the output terminal of the Hall sensor circuit. The output circuit is the same as the number of Hall sensors. In this embodiment, no level conversion circuit is used, and the detection signals output by multiple groups of Hall sensors are directly input to the microprocessor for signal processing through the filter circuit composed of the resistor R6 and the capacitor C2.

As shown in Figure 6, an output circuit is connected to the output end of the Hall sensor U1, including: a resistor R6 and a capacitor C2, one end of the resistor R6 is connected to the output end of the Hall sensor U1, and the other end is connected to the microprocessor and the capacitor C2 One end, the other end of the capacitor C2 is connected to the reference ground GND; the other output circuit is connected to the output end of the Hall sensor U1', including: a resistor R6' and a capacitor C2', and one end of the resistor R6' is connected to the output of the Hall sensor U1' terminal, the other terminal is connected to the microprocessor and one terminal of the capacitor C2', and the other terminal of the capacitor C2' is connected to the reference ground GND.

For other content not described in this embodiment, reference may be made to the second embodiment above.

Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (10)

1. A Hall switch valve in-position detection circuit, characterized in that, comprising: The Hall sensor is used to detect the magnetic signal sent by the magnet set on the valve, and output the in-position signal according to the detected magnetic signal; The microprocessor connected to the Hall sensor circuit is used to send the valve opening drive signal or the valve closing drive signal to drive the valve to move forward, and is also used to receive the in-position signal from the Hall sensor, and judge whether the valve is in place or not according to the in-position signal. Close the valve in place; The power adapter circuit connected to the microprocessor and the Hall sensor circuit is used to receive the valve opening drive signal or the valve close drive signal sent by the microprocessor, and the microprocessor supplies power to the Hall sensor through the power adapter circuit, Also provide a reference ground connection for the Hall sensor circuit. 2. A Hall switch valve in-position detection circuit according to claim 1, characterized in that the power adapter circuit comprises: transistors Q1, Q2, diodes D1, D2, The base of the triode Q1 is connected to the microprocessor, the emitter of the triode Q1 is connected to the microprocessor, the collector of the triode Q1 is connected to the reference ground, the base of the triode Q2 is connected to the microprocessor, and the emitter of the triode Q2 is connected to the microprocessor. processor, the collector of the transistor Q2 is connected to the reference ground, the anode of the diode D1 is connected to the microprocessor, the cathode of the diode D1 is connected to the reference ground and the power input terminal of the Hall sensor circuit, and the anode of the diode D2 is connected to the microprocessor , the cathode of the diode D2 is connected to the reference ground and the power input terminal of the Hall sensor circuit. 3. A Hall switch valve in-position detection circuit according to claim 2, characterized in that the power adapter circuit further comprises: resistors R1, R2, R3, One end of the resistor R1 is connected to the microprocessor, the other end of the resistor R1 is connected to the base of the transistor Q1, one end of the resistor R2 is connected to the microprocessor, the other end of the resistor R2 is connected to the base of the transistor Q2, and the resistor R3 One end of the resistor R3 is connected to the cathode of the diode D1 and the cathode of the diode D2, and the other end of the resistor R3 is connected to the Hall sensor circuit. 4. A Hall switch valve in-position detection circuit according to claim 1, characterized in that, the Hall sensor circuit comprises: a Hall sensor and a capacitor C1, The power input terminal of the Hall sensor is connected to the output terminal of the power adapter circuit, the ground terminal of the Hall sensor is connected to the reference ground, the output terminal of the Hall sensor is connected to the microprocessor, and one end of the capacitor C1 is connected to the power input of the Hall sensor end, and the other end of capacitor C1 is connected to the ground end of the Hall sensor. 5. A Hall switch valve in-position detection circuit according to claim 1, characterized in that the Hall sensor circuit comprises: at least two Hall sensors installed in different orientations and the same number of capacitors as the Hall sensors , The power input terminals of the Hall sensors are all connected to the output terminals of the power adapter circuit, the ground terminals of the Hall sensors are connected to the reference ground, the output terminals of the Hall sensors are connected to the microprocessor, and the power input terminals of the Hall sensors are connected to the Hall sensor. A capacitor is connected between the ground terminals of the sensor. 6. A Hall switch valve in-position detection circuit according to claim 4 or 5, further comprising: connected to the output terminal of the Hall sensor circuit, used for level conversion of the output signal level of the Hall sensor circuit A level conversion module, the output end of the level conversion module is connected to the microprocessor. 7. A Hall switch valve in-position detection circuit according to claim 6, characterized in that, the level shifting module comprises: a first level shifting circuit having the same number as the Hall sensors, and the first level shifting circuit The level conversion circuit is connected to the output terminal of the Hall sensor, and is used for level conversion of the Hall sensor output to the bit signal, and the output terminal of the first level conversion circuit is connected to the microprocessor. 8. A Hall switch valve in-position detection circuit according to claim 7, characterized in that the first level conversion circuit comprises: a resistor R4 and a diode D3, One end of the resistor R4 is connected to the power supply terminal, the other end of the resistor R4 is connected to the microprocessor and the anode of the diode D3, and the cathode of the diode D3 is connected to the output end of the Hall sensor. 9. A Hall switch valve in-position detection circuit according to claim 6, characterized in that, the level shifting module comprises: a second level shifting circuit, the second level shifting circuit is connected to the Hall The output terminal of the sensor is used for the level conversion of the Hall sensor output to the position signal, and the output terminal of the second level conversion circuit is connected to the microprocessor, The second level conversion circuit includes: diodes D4, D5 and resistor R5, the cathode of the diode D4 is connected to the output terminal of the Hall sensor, the anode of the diode D5 is connected to the microprocessor, one end of the resistor R5 and the anode of the diode D5 , the other end of the resistor R5 is connected to the power supply end, and the cathode of the diode D5 is connected to the output end of the Hall sensor. 10. A Hall switch valve in-position detection circuit according to claim 4 or 5, further comprising: an output circuit having the same number as the Hall sensor, and the output circuit is connected to the output terminal of the Hall sensor , including: resistor R6 and capacitor C2, One end of the resistor R6 is connected to the output end of the Hall sensor, the other end is connected to the microprocessor and one end of the capacitor C2, and the other end of the capacitor C2 is connected to the reference ground.