Nuclear-irradiation-resistant piezoelectric valve control circuit, control method thereof and valve positioner

Abstract

The invention provides a nuclear-irradiation-resistant piezoelectric valve control circuit, a control method thereof and a valve positioner, the circuit comprises a control module and a logic conversion module, and the control module generates a plurality of level signals according to an adjusting instruction input by a user; and the logic conversion module is connected with the control module and the piezoelectric valve and is used for carrying out logic conversion on the plurality of level signals in a nuclear irradiation environment to obtain corresponding control signals so as to realize on-off control on the piezoelectric valve and ensure normal work of the valve positioner. According to the piezoelectric valve control circuit provided by the invention, the control circuit is formed by electronic elements resistant to nuclear irradiation, so that the piezoelectric valve can be normally opened and closed in a nuclear irradiation environment, the circuit cost is not increased, the control logic of the circuit is simple, and the power consumption of the circuit is low.

Description

Technical Field

[0001] The invention relates to the field of piezoelectric valve control, and in particular to a nuclear radiation-resistant piezoelectric valve control circuit and a control method thereof, and a valve positioner. Background Art

[0002] Piezoelectric valve is a control valve made by using the principle that functional ceramic sheets bend and deform under voltage, which can realize the control of gas and liquid. At present, the control of piezoelectric valve is realized by the logic instructions sent by the CPU of the intelligent valve positioner to open and close the piezoelectric valve, so that the valve positioner can work in the intake, exhaust or holding state. If the intelligent valve positioner is in a nuclear irradiated environment, the control circuit of the piezoelectric valve will be affected by nuclear radiation, and the signal output by the control circuit will change, making the piezoelectric valve unable to open and close normally, resulting in the valve positioner not being able to work normally in the nuclear irradiated environment.

[0003] Therefore, how to provide a piezoelectric valve control circuit that can work normally in a nuclear irradiation environment is a technical problem that urgently needs to be solved. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a technical solution of a nuclear radiation-resistant piezoelectric valve control circuit to solve at least one of the above-mentioned technical problems.

[0005] In order to achieve the above-mentioned purpose and other related purposes, the technical solution provided by this application is as follows.

[0006] According to a first aspect of an embodiment of the present application, there is provided a nuclear radiation resistant piezoelectric valve control circuit, comprising:

[0007] A control module, used for generating a plurality of level signals according to an adjustment instruction;

[0008] A logic conversion module is connected to the control module and the piezoelectric valve, and performs logic conversion on the multiple level signals based on the nuclear radiation-resistant element in the logic conversion module to obtain multiple control signals; so as to ensure that the piezoelectric valve controls the valve positioner to work normally based on the multiple control signals.

[0009] In one embodiment of the present application, the piezoelectric valve includes an exhaust piezoelectric valve and an intake piezoelectric valve, and the logic conversion module includes four signal processing units. The signal processing unit receives the level signal, performs logic conversion on the level signal, and obtains the control signal. In a nuclear irradiation environment, the corresponding control signals are output by the four signal processing units, and the exhaust piezoelectric valve is controlled based on the first control signal and the third control signal, and the intake piezoelectric valve is controlled based on the second control signal and the fourth control signal. The intake, exhaust and holding functions implemented by the valve positioner are controlled according to the working states of the exhaust piezoelectric valve and the intake piezoelectric valve.

[0010] In one embodiment of the present application, the signal processing unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a photocoupler, a first capacitor and an NPN transistor, wherein the first end of the first resistor is connected to the first input end of the photocoupler, the first power supply is connected to the first output end of the photocoupler via the second resistor, the first power supply is also connected to the drain of the NPN transistor via the third resistor, the first output end of the photocoupler is connected to the base of the NPN transistor via the fourth resistor, the second output end of the photocoupler is grounded, the first end of the first capacitor is connected to the first output end of the photocoupler, the second end of the first capacitor is connected to the second output end of the photocoupler, and the source of the NPN transistor is grounded, wherein the second end of the first resistor and the second input end of the photocoupler are the input ends of the signal processing unit, and the drain of the NPN transistor is the output end of the signal processing unit.

[0011] In one embodiment of the present application, the photoelectric coupler includes a light emitting diode and a transistor, the anode of the light emitting diode is the first input terminal of the photoelectric coupler, the cathode of the light emitting diode is the second input terminal of the photoelectric coupler, the collector of the transistor is the first output terminal of the photoelectric coupler, and the emitter of the transistor is the second output terminal of the photoelectric coupler.

[0012] In one embodiment of the present application, the photoelectric coupler is a nuclear radiation resistant element.

[0013] According to a second aspect of an embodiment of the present application, a control method for a nuclear radiation resistant piezoelectric valve control circuit is provided, which is applied to the nuclear radiation resistant piezoelectric valve control circuit as described above, and includes:

[0014] Obtaining the adjustment instruction, and generating a plurality of the level signals according to the adjustment instruction;

[0015] In a nuclear irradiation environment, a plurality of level signals are logically converted based on the nuclear radiation resistant elements in the logic conversion module to obtain a plurality of control signals, and the piezoelectric valve is controlled to work normally based on the plurality of control signals.

[0016] In one embodiment of the present application, the method for generating the control signal includes: if there is a potential difference between the two input terminals of the nuclear radiation resistant element, the nuclear radiation resistant element is turned on, and the control signal is pulled down to obtain the control signal of a low level; if the two input terminals of the nuclear radiation resistant element have the same potential, the nuclear radiation resistant element is turned off, and the control signal is pulled up to obtain the control signal of a high level.

[0017] In one embodiment of the present application, the piezoelectric valve includes an exhaust piezoelectric valve and an intake piezoelectric valve. When there are four control signals, multiple control signals control the piezoelectric valve to work normally, including: when the first control signal is high, the second control signal is high, the third control signal is low, and the fourth control signal is low, the exhaust piezoelectric valve is opened, the intake piezoelectric valve is closed, and the valve positioner exhausts air; when the first control signal is low, the second control signal is low, the third control signal is high, and the fourth control signal is high, the exhaust piezoelectric valve is closed, the intake piezoelectric valve is opened, and the valve positioner intakes air; when the first control signal is low, the second control signal is high, the third control signal is low, and the fourth control signal is high, the exhaust piezoelectric valve is closed, the intake piezoelectric valve is opened, and the valve positioner intakes air; when the first control signal is low, the second control signal is high, the third control signal is low, and the fourth control signal is high, the exhaust piezoelectric valve is closed, the intake piezoelectric valve is closed, and the valve positioner is maintained.

[0018] According to a third aspect of the embodiments of the present application, a valve positioner is provided, comprising the nuclear radiation resistant piezoelectric valve control circuit as described above, so that the valve positioner can work normally in a nuclear radiation environment.

[0019] The present application provides a nuclear radiation resistant piezoelectric valve control circuit and its control method, and a valve positioner. The circuit includes a control module and a logic conversion module. The control module generates multiple level signals according to the adjustment instructions input by the user; the logic conversion module is connected to the control module and the piezoelectric valve, and in a nuclear radiation environment, the multiple level signals are logically converted to obtain corresponding control signals to realize the switch control of the piezoelectric valve and ensure the normal operation of the valve positioner. The piezoelectric valve control circuit provided by the present application is composed of a control circuit with nuclear radiation resistant electronic components, so that the piezoelectric valve can be opened and closed normally in a nuclear radiation environment without increasing the circuit cost, the control logic of the circuit is simple, and the power consumption of the circuit is low.

[0020] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present invention, and together with the specification, are used to explain the principles of the present invention. Obviously, the drawings described below are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 is a block diagram of a nuclear radiation resistant piezoelectric valve control circuit according to an exemplary embodiment of the present invention;

[0023] Figure 2 is a specific circuit structure of a first signal processing unit shown in an exemplary embodiment of the present invention;

[0024] Figure 3 is a specific circuit structure of a second signal processing unit shown in an exemplary embodiment of the present invention;

[0025] Figure 4 is a specific circuit structure of a third signal processing unit shown in an exemplary embodiment of the present invention;

[0026] Figure 5 It is a specific circuit structure of the fourth signal processing unit shown in an exemplary embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0028] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0029] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details. In other embodiments, well-known structures and devices are shown in the form of block diagrams rather than in detail to avoid making the embodiments of the present invention difficult to understand.

[0030] The Central Processing Unit (CPU) is the computing and control core of the computer system and is the final execution unit for information processing and program running.

[0031] Piezoelectric valve is a control valve made by using the principle that functional ceramic sheets bend and deform under voltage, which can realize the control of gas and liquid. At present, the control of piezoelectric valve is realized by the logic instructions sent by the CPU of the intelligent valve positioner to open and close the piezoelectric valve, so that the valve positioner can work in the intake, exhaust or holding state. If the intelligent valve positioner is in a nuclear irradiated environment, the control circuit of the piezoelectric valve will be affected by nuclear radiation, and the signal output by the control circuit will change, making the piezoelectric valve unable to open and close normally, resulting in the valve positioner not being able to work normally in the nuclear irradiated environment.

[0032] To solve the above problems, Figure 1 As shown, the present application provides a nuclear radiation resistant piezoelectric valve control circuit, comprising:

[0033] A control module, used for generating a plurality of level signals according to an adjustment instruction;

[0034] The logic conversion module is connected to the control module and the piezoelectric valve, and performs logic conversion on multiple level signals based on the nuclear radiation-resistant elements in the logic conversion module to obtain multiple control signals; so as to ensure the normal operation of the piezoelectric valve control valve positioner based on the multiple control signals.

[0035] In detail, the piezoelectric valve includes an exhaust piezoelectric valve and an intake piezoelectric valve, and the logic conversion module includes four signal processing units, which are connected to four level signals in a one-to-one correspondence, and perform logic conversion on the level signals respectively to obtain four control signals. In a nuclear irradiation environment, the exhaust piezoelectric valve is controlled based on the first control signal and the third control signal, and the intake piezoelectric valve is controlled based on the second control signal and the fourth control signal. The intake, exhaust and holding functions realized by the valve positioner are controlled according to the working states of the exhaust piezoelectric valve and the intake piezoelectric valve.

[0036] In more detail, Figure 2As shown, the first signal processing unit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a photocoupler U1, a first capacitor C1 and an NPN transistor Q1. The first end of the first resistor R1 is connected to the first input end of the photocoupler U1, the first power source VHH is connected to the first output end of the photocoupler U1 via the second resistor R2, the first power source VHH is further connected to the drain of the NPN transistor Q1 via the third resistor R3, the first output end of the photocoupler U1 is connected to the base of the NPN transistor Q1 via the fourth resistor R4, and the second output end of the photocoupler U1 is connected to the The first end of the first capacitor C1 is connected to the first output end of the photocoupler U1, the second end of the first capacitor C1 is connected to the second output end of the photocoupler U1, and the source of the NPN transistor Q1 is grounded, wherein the second end of the first resistor R1 and the second input end of the photocoupler U1 are the input end of the first signal processing unit, the second end of the first resistor R1 is connected to the first level signal P30, the second input end of the photocoupler U1 is grounded, the drain of the NPN transistor Q1 is the output end of the first signal processing unit, and the output end of the first signal processing unit outputs the first control signal K0 to the outside.

[0037] In more detail, Figure 3 As shown, the second signal processing unit includes a first resistor R5, a second resistor R6, a third resistor R7, a fourth resistor R8, a photocoupler U2, a first capacitor C2 and an NPN transistor Q2. The first end of the first resistor R5 is connected to the first input end of the photocoupler U2. The first power source VHH is connected to the first output end of the photocoupler U2 via the second resistor R6. The first power source VHH is also connected to the drain of the NPN transistor Q2 via the third resistor R7. The first output end of the photocoupler U2 is connected to the base of the NPN transistor Q2 via the fourth resistor R8. The second output end of the photocoupler U2 is grounded. A first end of a capacitor C2 is connected to a first output end of a photocoupler U2, a second end of the first capacitor C2 is connected to a second output end of the photocoupler U2, and a source of the NPN transistor Q2 is grounded, wherein a second end of the first resistor R5 and a second input end of the photocoupler U2 are input ends of a second signal processing unit, a second end of the first resistor R5 is connected to a second power supply VCC, a second input end of the photocoupler U2 is connected to a second level signal P31, a drain of the NPN transistor Q2 is an output end of the second signal processing unit, and an output end of the second signal processing unit outputs a second control signal K1 to the outside.

[0038] In more detail, Figure 4As shown, the third signal processing unit includes a first resistor R9, a second resistor R10, a third resistor R11, a fourth resistor R12, a photocoupler U3, a first capacitor C3 and an NPN transistor Q3. The first end of the first resistor R9 is connected to the first input end of the photocoupler U3. The first power source VHH is connected to the first output end of the photocoupler U3 via the second resistor R10. The first power source VHH is also connected to the drain of the NPN transistor Q3 via the third resistor R11. The first output end of the photocoupler U3 is connected to the base of the NPN transistor Q3 via the fourth resistor R12. The second input end of the photocoupler U3 is connected to the base of the NPN transistor Q3. The output end is grounded, the first end of the first capacitor C3 is connected to the first output end of the photocoupler U3, the second end of the first capacitor C3 is connected to the second output end of the photocoupler U3, and the source of the NPN transistor Q3 is grounded, wherein the second end of the first resistor R9 and the second input end of the photocoupler U3 are the input ends of the third signal processing unit, the second end of the first resistor R9 is connected to the third level signal P32, the second input end of the photocoupler U3 is grounded, the drain of the NPN transistor Q3 is the output end of the third signal processing unit, and the output end of the third signal processing unit outputs the third control signal K2 to the outside.

[0039] In more detail, Figure 5 As shown, the fourth signal processing unit includes a first resistor R13, a second resistor R14, a third resistor R15, a fourth resistor R16, a photocoupler U4, a first capacitor C4 and an NPN transistor Q4, a first end of the first resistor R13 is connected to a first input end of the photocoupler U4, a first power source VHH is connected to a first output end of the photocoupler U4 via the second resistor R14, the first power source VHH is further connected to a drain of the NPN transistor Q4 via the third resistor R15, a first output end of the photocoupler U4 is connected to a base of the NPN transistor Q4 via the fourth resistor R16, and a second output end of the photocoupler U4 is connected to The first end of the first capacitor C4 is connected to the first output end of the photocoupler U4, the second end of the first capacitor C4 is connected to the second output end of the photocoupler U4, and the source of the NPN transistor Q4 is grounded, wherein the second end of the first resistor R13 and the second input end of the photocoupler U4 are the input ends of the fourth signal processing unit, the second end of the first resistor R13 is connected to the second power supply VCC, the second input end of the photocoupler U4 is connected to the fourth level signal P33, the drain of the NPN transistor Q4 is the output end of the fourth signal processing unit, and the output end of the fourth signal processing unit outputs the fourth control signal K3 to the outside.

[0040] It should be noted that the photoelectric coupler (U1, U2, U3, U4) includes a light emitting diode and a transistor, the anode of the light emitting diode is the first input terminal of the photoelectric coupler (U1, U2, U3, U4), the cathode of the light emitting diode is the second input terminal of the photoelectric coupler (U1, U2, U3, U4), the collector of the transistor is the first output terminal of the photoelectric coupler (U1, U2, U3, U4), and the emitter of the transistor is the second output terminal of the photoelectric coupler (U1, U2, U3, U4).

[0041] In more detail, the photocoupler is a nuclear radiation resistant component.

[0042] like Figures 1 to 5 As shown, the working principle of the nuclear radiation resistant piezoelectric valve control circuit provided by the present application is as follows:

[0043] like Figure 1 As shown, the control module receives the adjustment signal, generates four level signals according to the adjustment signal, and inputs the four level signals into the logic conversion module. The logic conversion module performs logic conversion on the level signal through the nuclear radiation-resistant optocoupler electronic components in each signal processing unit to obtain the corresponding control signal. The opening and closing of the piezoelectric valve are controlled by the four control signals to ensure the exhaust, intake and holding functions of the valve positioner.

[0044] The exhaust piezoelectric valve is controlled by the first control signal K0 and the fourth control signal K3 , and the intake piezoelectric valve is controlled by the second control signal K1 and the third control signal K2 .

[0045] like Figure 2-Figure 5 , the working principles of the four signal processing units are as follows:

[0046] The first level signal P30 is low level, the photocoupler U1 is cut off, the NPN transistor Q1 is cut off, and the first control signal K0 is high level; the second level signal P31 is high level, the photocoupler U2 is cut off, the NPN transistor Q2 is cut off, and the second control signal K1 is high level; the third level signal P32 is high level, the photocoupler U3 is turned on, the NPN transistor Q3 is turned on, and the third control signal K2 is low level; the fourth level signal P33 is low level, the photocoupler U4 is turned on, the NPN transistor Q4 is turned on, and the fourth control signal K3 is low level; the exhaust piezoelectric valve is opened, the intake piezoelectric valve is closed, and the valve positioner is exhausted.

[0047] The first level signal P30 is high, the photocoupler U1 is turned on, the NPN transistor Q1 is turned on, and the first control signal K0 is low; the second level signal P31 is low, the photocoupler U2 is turned on, the NPN transistor Q2 is turned on, and the second control signal K1 is low; the third level signal P32 is low, the photocoupler U3 is turned off, the NPN transistor Q3 is turned off, and the third control signal K2 is high; the fourth level signal P33 is high, the photocoupler U4 is turned off, the NPN transistor Q4 is turned off, and the fourth control signal K3 is high; the exhaust piezoelectric valve is closed, the intake piezoelectric valve is opened, and the valve positioner is intake.

[0048] The first level signal P30 is high, the photocoupler U1 is turned on, the NPN transistor Q1 is turned on, and the first control signal K0 is low; the second level signal P31 is high, the photocoupler U2 is turned off, the NPN transistor Q2 is turned off, and the second control signal K1 is high; the third level signal P32 is high, the photocoupler U3 is turned on, the NPN transistor Q3 is turned on, and the third control signal K2 is low; the fourth level signal P33 is high, the photocoupler U4 is turned off, the NPN transistor Q4 is turned off, and the fourth control signal K3 is high; the exhaust piezoelectric valve is closed, the intake piezoelectric valve is closed, and the valve positioner maintains the last working state.

[0049] The present application also provides a control method for a nuclear radiation resistant piezoelectric valve control circuit, which is applied to the nuclear radiation resistant piezoelectric valve control circuit as described above, comprising:

[0050] Obtaining adjustment instructions, and generating multiple level signals according to the adjustment instructions;

[0051] In a nuclear irradiation environment, a plurality of level signals are logically converted based on the nuclear radiation resistant elements in the logic conversion module to obtain a plurality of control signals, and the piezoelectric valve is controlled to work normally based on the plurality of control signals.

[0052] In detail, the method of generating the control signal includes: if there is a potential difference between the two input terminals of the nuclear radiation resistant element, the nuclear radiation resistant element is turned on, and the control signal is pulled down to obtain a low-level control signal; if the two input terminals of the nuclear radiation resistant element have the same potential, the nuclear radiation resistant element is cut off, and the control signal is pulled up to obtain a high-level control signal. Specifically, when the voltages of the two input terminals of the photocoupler (U1, U2, U3, U4) are at a high level and the other is at a low level, the photocoupler (U1, U2, U3, U4) is turned on, and the corresponding NPN transistor (Q1, Q2, Q3, Q4) is turned on, and the control signal is pulled down to obtain a low-level control signal; when the voltages of the two input terminals of the photocoupler (U1, U2, U3, U4) are both at a high level or both at a low level, the photocoupler (U1, U2, U3, U4) is turned off, and the corresponding NPN transistor (Q1, Q2, Q3, Q4) is turned off, and the control signal is pulled up by the first power supply VHH to obtain a high-level control signal.

[0053] In more detail, the piezoelectric valve includes an exhaust piezoelectric valve and an intake piezoelectric valve. When there are four control signals, the piezoelectric valve is controlled to work normally based on multiple control signals, including: when the first control signal is high, the second control signal is high, the third control signal is low and the fourth control signal is low, the exhaust piezoelectric valve opens, the intake piezoelectric valve closes, and the valve positioner exhausts air; when the first control signal is low, the second control signal is low, the third control signal is high and the fourth control signal is high, the exhaust piezoelectric valve closes, the intake piezoelectric valve opens, and the valve positioner intakes air; when the first control signal is low, the second control signal is high, the third control signal is low and the fourth control signal is high, the exhaust piezoelectric valve closes, the intake piezoelectric valve closes, and the valve positioner maintains air.

[0054] The present application also provides a valve positioner, which includes the nuclear radiation-resistant piezoelectric valve control circuit as described above. In a nuclear radiation environment, the exhaust piezoelectric valve and the intake piezoelectric valve are normally controlled to open and close by the nuclear radiation-resistant piezoelectric valve control circuit, so that the valve positioner works normally.

[0055] The present application provides a nuclear radiation resistant piezoelectric valve control circuit and its control method, and a valve positioner. The circuit includes a control module and a logic conversion module. The control module generates multiple level signals according to the adjustment instructions input by the user; the logic conversion module is connected to the control module and the piezoelectric valve, and in a nuclear radiation environment, the multiple level signals are logically converted to obtain corresponding control signals to realize the switch control of the piezoelectric valve and ensure the normal operation of the valve positioner. The piezoelectric valve control circuit provided by the present application is composed of nuclear radiation resistant electronic components to form a control circuit, so that the piezoelectric valve can be opened and closed normally in a nuclear radiation environment without increasing the circuit cost. The control logic of the circuit is simple, the power consumption of the circuit is small, and the circuit can also be used in a normal environment, with a wide range of applications.

[0056] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A nuclear radiation resistant piezoelectric valve control circuit, characterized in that: include: A control module, used for generating a plurality of level signals according to an adjustment instruction; A logic conversion module is connected to the control module and the piezoelectric valve, and performs logic conversion on the multiple level signals based on the nuclear radiation-resistant element in the logic conversion module to obtain multiple control signals; so as to ensure that the piezoelectric valve controls the valve positioner to work normally based on the multiple control signals.

2. The nuclear radiation resistant piezoelectric valve control circuit according to claim 1, characterized in that: The piezoelectric valve includes an exhaust piezoelectric valve and an intake piezoelectric valve, and the logic conversion module includes four signal processing units. The four signal processing units are connected to the four level signals in a one-to-one correspondence, and the level signals are logically converted respectively to obtain four control signals. In a nuclear irradiation environment, the exhaust piezoelectric valve is controlled based on the first control signal and the third control signal, and the intake piezoelectric valve is controlled based on the second control signal and the fourth control signal. The intake, exhaust and holding functions implemented by the valve positioner are controlled according to the working states of the exhaust piezoelectric valve and the intake piezoelectric valve.

3. The nuclear radiation resistant piezoelectric valve control circuit according to claim 2, characterized in that: The signal processing unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a photocoupler, a first capacitor and an NPN transistor, wherein the first end of the first resistor is connected to the first input end of the photocoupler, the first power supply is connected to the first output end of the photocoupler via the second resistor, the first power supply is also connected to the drain of the NPN transistor via the third resistor, the first output end of the photocoupler is connected to the base of the NPN transistor via the fourth resistor, the second output end of the photocoupler is grounded, the first end of the first capacitor is connected to the first output end of the photocoupler, the second end of the first capacitor is connected to the second output end of the photocoupler, and the source of the NPN transistor is grounded, wherein the second end of the first resistor and the second input end of the photocoupler are the input ends of the signal processing unit, and the drain of the NPN transistor is the output end of the signal processing unit.

4. The nuclear radiation resistant piezoelectric valve control circuit according to claim 3, characterized in that: The photoelectric coupler includes a light emitting diode and a transistor, wherein the anode of the light emitting diode is the first input end of the photoelectric coupler, the cathode of the light emitting diode is the second input end of the photoelectric coupler, the collector of the transistor is the first output end of the photoelectric coupler, and the emitter of the transistor is the second output end of the photoelectric coupler.

5. The nuclear radiation resistant piezoelectric valve control circuit according to claim 3, characterized in that: The photoelectric coupler is a nuclear radiation resistant component.

6. A control method for a nuclear radiation resistant piezoelectric valve control circuit, characterized in that: The nuclear radiation resistant piezoelectric valve control circuit used in any one of claims 1 to 5 comprises: Obtaining the adjustment instruction, and generating a plurality of the level signals according to the adjustment instruction; In a nuclear irradiation environment, a plurality of level signals are logically converted based on the nuclear radiation resistant elements in the logic conversion module to obtain a plurality of control signals, and the piezoelectric valve is controlled to work normally based on the plurality of control signals.

7. The control method of the nuclear radiation resistant piezoelectric valve control circuit according to claim 6, characterized in that: The control signal is generated in a manner including: If there is a potential difference between the two input terminals of the nuclear radiation resistant element, the nuclear radiation resistant element is turned on, and the control signal is pulled down to obtain the control signal of a low level; If the two input terminals of the nuclear radiation resistant element have the same potential, the nuclear radiation resistant element is cut off, and the control signal is pulled up to obtain the control signal of a high level.

8. The control method of the nuclear radiation resistant piezoelectric valve control circuit according to claim 7, characterized in that: The piezoelectric valve includes an exhaust piezoelectric valve and an intake piezoelectric valve. When there are four control signals, the piezoelectric valve is controlled to work normally based on the multiple control signals, including: When the first control signal is at a high level, the second control signal is at a high level, the third control signal is at a low level, and the fourth control signal is at a low level, the exhaust piezoelectric valve is opened, the intake piezoelectric valve is closed, and the valve positioner is exhausted; When the first control signal is at a low level, the second control signal is at a low level, the third control signal is at a high level, and the fourth control signal is at a high level, the exhaust piezoelectric valve is closed, the intake piezoelectric valve is opened, and the valve positioner is inlet; When the first control signal is at a low level, the second control signal is at a high level, the third control signal is at a low level and the fourth control signal is at a high level, the exhaust piezoelectric valve is closed, the intake piezoelectric valve is closed, and the valve positioner is maintained.

9. A valve positioner, characterized in that: The invention comprises the nuclear radiation resistant piezoelectric valve control circuit as claimed in any one of claims 1 to 5, so that the valve positioner can work normally in a nuclear radiation environment.

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