Micro-control circuit of electric control type butterfly valve

Abstract

The utility model relates to a micro-control circuit of an electric control type butterfly valve, which comprises a positive and negative rotation change-over switch, a stop switch, a first AND gate, a second AND gate, a positive rotation switch unit and a negative rotation switch unit, and the positive rotation switch unit and the negative rotation switch unit are both electric control switch units. The stop switch is a normally closed switch, when a knife throw of the forward and reverse rotation change-over switch is located at a first fixed end, the first AND gate outputs a high level, the forward rotation switch unit is switched on, two groups of normally open contacts of the forward rotation switch unit are attracted, the butterfly valve driving motor is electrified to rotate forward, and the electric control butterfly valve is opened under the driving of the butterfly valve driving motor; when a knife throw of the forward and reverse rotation change-over switch is located at a second fixed end, a second AND gate outputs a high level, the reverse rotation switch unit is switched on, two groups of normally open contacts of the reverse rotation switch unit are closed, and the butterfly valve driving motor is electrified to rotate reversely and is closed under the driving of the butterfly valve driving motor; start and stop of the butterfly valve driving motor can be controlled by adopting voltage lower than voltage, and operation safety performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a microcontroller circuit for an electrically controlled butterfly valve. Background Technology

[0002] Electrically controlled butterfly valves typically use a motor to drive the valve stem to achieve the opening and closing functions. In the existing technology, electrically controlled butterfly valves usually use a switch directly connected to the motor to control the motor's forward, reverse, and stop rotation, directly controlling the motor by operating the switch. However, electrically controlled butterfly valves have a wide range of applications, and the voltage of their drive motors varies. When the operating voltage of the drive motor exceeds 36V, there is a risk of electric shock when the motor is directly connected by a manual switch. Utility Model Content

[0003] In order to solve the technical problem in the prior art that there is a risk of electric shock when the operating voltage of the drive motor exceeds 36V and the motor is directly connected by a manual switch, this utility model provides a micro-control circuit for an electrically controlled butterfly valve.

[0004] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0005] A microcontroller circuit for an electrically controlled butterfly valve includes a forward / reverse switching switch, a stop switch, a first AND gate, a second AND gate, a forward switching unit, and a reverse switching unit, wherein both the forward switching unit and the reverse switching unit are electrically controlled switching units.

[0006] The forward / reverse switching switch is a single-pole double-throw switch. The single-pole double-throw switch includes a moving terminal, a first stationary terminal, and a second stationary terminal. The moving terminal of the single-pole double-throw switch is connected to a first power supply. The first stationary terminal of the single-pole double-throw switch is electrically connected to an input terminal of the first AND gate. The second stationary terminal of the single-pole double-throw switch is electrically connected to an input terminal of the second AND gate.

[0007] The stop switch is a normally closed switch. One end of the stop switch is connected to the first power supply, and the other end of the stop switch is electrically connected to the other input terminal of the first AND gate and the other input terminal of the second AND gate, respectively.

[0008] The output terminal of the first AND gate is electrically connected to the control terminal of the forward rotation switch unit. The positive terminal of the power input terminal of the forward rotation switch unit is connected to a second power source, and the negative terminal of the power input terminal of the forward rotation switch unit is grounded. The forward rotation switch unit includes two sets of contacts, each set including two normally open contacts. One normally open contact of one set of contacts of the forward rotation switch unit is connected to the motor operating power source, and the other normally open contact of one set of contacts of the forward rotation switch unit is electrically connected to one power input terminal of the butterfly valve drive motor. One normally open contact of the other set of contacts of the forward rotation switch unit is grounded, and the other normally open contact of the other set of contacts of the forward rotation switch unit is electrically connected to another power input terminal of the butterfly valve drive motor.

[0009] The output terminal of the second AND gate is electrically connected to the control terminal of the reverse switch unit. The positive terminal of the power input terminal of the reverse switch unit is connected to the second power supply, and the negative terminal of the power input terminal of the reverse switch unit is grounded. The reverse switch unit includes two sets of contacts, each set including two normally open contacts. One normally open contact of one set of contacts of the reverse switch unit is electrically connected to one power input terminal of the butterfly valve drive motor, and the other normally open contact of one set of contacts of the reverse switch unit is grounded. One normally open contact of the other set of contacts of the reverse switch unit is electrically connected to another power input terminal of the butterfly valve drive motor, and the other normally open contact of the other set of contacts of the forward switch unit is connected to the motor's operating power supply.

[0010] The beneficial effects of this utility model are as follows: The stop switch is a normally closed switch. When the stop switch is not open, and the knife-throw switch of the forward / reverse switching unit is positioned at the first stationary end, the first AND gate outputs a high level, meaning the controlled end of the forward switching unit is at a high level, the forward switching unit is turned on, the two normally open contacts of the forward switching unit are attracted, the butterfly valve drive motor is energized and rotates forward, and the electrically controlled butterfly valve opens under the drive of the butterfly valve drive motor. When the stop switch is not open, and the knife-throw switch of the forward / reverse switching unit is positioned at the second stationary end, the second AND gate outputs a high level, meaning the controlled end of the reverse switching unit is at a high level, the reverse switching unit is turned on, the two normally open contacts of the reverse switching unit are attracted, the butterfly valve drive motor is energized and rotates in reverse, and the electrically controlled butterfly valve closes under the drive of the butterfly valve drive motor. This realizes remote control of the forward / reverse rotation and start / stop of the butterfly valve drive motor. Simultaneously, the circuits controlling the forward and reverse switching units can use an operating voltage lower than 24V, improving operational safety. AND gate circuits can also replace the tedious microcontroller code editing work required for controlling motors using microcontrollers in traditional technologies.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] Furthermore, it also includes a first signal amplifier and a second signal amplifier. The input terminal of the first signal amplifier is electrically connected to the output terminal of the first AND gate, and the output terminal of the first signal amplifier is electrically connected to the control terminal of the forward rotation switch unit. The input terminal of the second signal amplifier is electrically connected to the output terminal of the second AND gate, and the output terminal of the second signal amplifier is electrically connected to the control terminal of the reverse rotation switch unit.

[0013] The beneficial effect of adopting the above-mentioned further scheme is that by setting a first signal amplifier and a second signal amplifier, the first signal amplifier amplifies the output signal of the first AND gate, and the second signal amplifier amplifies the output signal of the second AND gate, thereby improving the driving capability of the output signals of the first AND gate and the second AND gate.

[0014] Furthermore, the first signal amplifier includes a first operational amplifier, a first resistor, and a second resistor. The non-inverting input of the first operational amplifier is electrically connected to the output of the first AND gate. One end of the first resistor is electrically connected to the output of the first operational amplifier. The other end of the first resistor is electrically connected to the inverting input of the first operational amplifier and one end of the second resistor, respectively. The other end of the second resistor is grounded. The output of the first operational amplifier is electrically connected to the control terminal of the forward rotation switch unit.

[0015] Furthermore, the second signal amplifier includes a second operational amplifier, a third resistor, and a fourth resistor. The non-inverting input of the second operational amplifier is electrically connected to the output of the second AND gate. One end of the third resistor is electrically connected to the output of the second operational amplifier. The other end of the third resistor is electrically connected to both the inverting input of the second operational amplifier and one end of the fourth resistor. The other end of the fourth resistor is grounded. The output of the second operational amplifier is electrically connected to the control terminal of the inverting switch unit.

[0016] Furthermore, the forward rotation switch unit includes a first transistor, a fifth resistor, a sixth resistor, and a first relay; one end of the fifth resistor is electrically connected to the output terminal of the first operational amplifier, the other end of the fifth resistor is electrically connected to the base of the first transistor and one end of the sixth resistor, the other end of the sixth resistor and the emitter of the first transistor are both grounded, one end of the coil of the first relay is connected to the second power supply, the other end of the coil of the first relay is electrically connected to the collector of the first transistor, and the first relay includes two sets of contacts of the forward rotation switch unit.

[0017] Furthermore, the forward rotation switch unit also includes a forward rotation limit switch, one end of which is connected to the second power supply, and the other end of which is electrically connected to one end of the coil of the first relay.

[0018] The beneficial effect of adopting the above-mentioned further solution is that by setting a forward rotation limit switch and installing the forward rotation limit switch at the limit position on the opening side of the electrically controlled butterfly valve, when the valve shaft of the electrically controlled butterfly valve rotates to the opening side, it will trigger the forward rotation limit switch when it reaches the limit position. The forward rotation limit switch will be disconnected, the coil of the first relay will be de-energized, the butterfly valve drive motor will be de-energized, and the forward rotation will stop.

[0019] Furthermore, the forward rotation switch unit also includes a first diode, the negative terminal of which is electrically connected to one end of the coil of the first relay, and the positive terminal of which is electrically connected to the other end of the coil of the first relay.

[0020] The beneficial effect of adopting the above-mentioned further solution is that by connecting a first diode across the coil of the first relay, its main function is to absorb the inrush current and protect other components in the circuit from damage. When the electromagnetic coil is de-energized, due to the principle of electromagnetic induction, a certain amount of energy will be stored in the coil. If the power is directly cut off, a very high back electromotive force will be generated across the coil, which may damage the coil or other electronic components. By connecting a diode in parallel across the coil, the unidirectional conductivity of the diode can be used to release the energy in the coil through the diode, thereby avoiding the generation of back electromotive force and protecting other components in the circuit.

[0021] Furthermore, the inverting switch unit includes a second transistor, a seventh resistor, an eighth resistor, and a second relay; one end of the seventh resistor is electrically connected to the output terminal of the first operational amplifier, the other end of the seventh resistor is electrically connected to the base of the first transistor and one end of the eighth resistor, the other end of the eighth resistor and the emitter of the first transistor are both grounded, one end of the coil of the second relay is connected to the second power supply, the other end of the coil of the second relay is electrically connected to the collector of the first transistor, and the second relay includes two sets of contacts of the inverting switch unit.

[0022] Furthermore, the reversing switch unit also includes a reversing limit switch, one end of which is connected to the second power supply, and the other end of which is electrically connected to one end of the coil of the second relay.

[0023] The beneficial effect of adopting the above-mentioned further solution is that by setting a reversing limit switch and installing the reversing limit switch at the extreme position of the closed side of the electrically controlled butterfly valve, when the valve shaft of the electrically controlled butterfly valve rotates to the closed side, it will trigger the reversing limit switch when it reaches the extreme position. The reversing limit switch will be disconnected, the coil of the second relay will be de-energized, the butterfly valve drive motor will be de-energized, and the reversing will stop.

[0024] Furthermore, the reversing switch unit also includes a second diode, the negative terminal of which is electrically connected to one end of the coil of the second relay, and the positive terminal of which is electrically connected to the other end of the coil of the second relay.

[0025] The beneficial effect of this invention is that by connecting a second diode across the coil of the second relay, its main function is to absorb inrush current and protect other components in the circuit from damage. When the electromagnetic coil is de-energized, due to the principle of electromagnetic induction, a certain amount of energy is stored in the coil. If the power is directly cut off, a high back electromotive force will be generated across the coil, which may damage the coil or other electronic components. By connecting a diode in parallel across the coil, the unidirectional conductivity of the diode can be used to release the energy in the coil through the diode, thereby avoiding the generation of back electromotive force and protecting other components in the circuit. Attached Figure Description

[0026] Figure 1 This is the circuit schematic diagram of this utility model;

[0027] Figure 2 This is the circuit schematic of the first signal amplifier;

[0028] Figure 3 This is the circuit schematic of the second signal amplifier. Detailed Implementation

[0029] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0030] like Figure 1 As shown, this embodiment provides a micro-control circuit for an electrically controlled butterfly valve, including a forward / reverse switching switch S1, a stop switch S2, a first AND gate U1, a second AND gate U2, a forward switch unit, and a reverse switch unit, wherein both the forward switch unit and the reverse switch unit are electrically controlled switch units.

[0031] The forward / reverse switching switch S1 is a single-pole double-throw switch. The single-pole double-throw switch includes a moving end, a first stationary end, and a second stationary end. The moving end of the single-pole double-throw switch is connected to a first power supply. The first stationary end of the single-pole double-throw switch is electrically connected to an input terminal of the first AND gate U1. The second stationary end of the single-pole double-throw switch is electrically connected to an input terminal of the second AND gate U2.

[0032] The stop switch S2 is a normally closed switch. One end of the stop switch S2 is connected to the first power supply, and the other end of the stop switch S2 is electrically connected to the other input terminal of the first AND gate U1 and the other input terminal of the second AND gate U2, respectively.

[0033] The output terminal of the first AND gate U1 is electrically connected to the control terminal of the forward rotation switch unit. The positive terminal of the power input terminal of the forward rotation switch unit is connected to a second power supply, and the negative terminal of the power input terminal of the forward rotation switch unit is grounded. The forward rotation switch unit includes two sets of contacts, each set of contacts including two normally open contacts. One normally open contact of one set of contacts of the forward rotation switch unit is connected to the motor operating power supply, and the other normally open contact of one set of contacts of the forward rotation switch unit is electrically connected to one power input terminal of the butterfly valve drive motor. One normally open contact of the other set of contacts of the forward rotation switch unit is grounded, and the other normally open contact of the other set of contacts of the forward rotation switch unit is electrically connected to another power input terminal of the butterfly valve drive motor.

[0034] The output terminal of the second AND gate U2 is electrically connected to the control terminal of the reverse switch unit. The positive terminal of the power input terminal of the reverse switch unit is connected to the second power supply, and the negative terminal of the power input terminal of the reverse switch unit is grounded. The reverse switch unit includes two sets of contacts, each set including two normally open contacts. One normally open contact of one set of contacts of the reverse switch unit is electrically connected to one power input terminal of the butterfly valve drive motor, and the other normally open contact of the same set of contacts is grounded. One normally open contact of the other set of contacts of the reverse switch unit is electrically connected to another power input terminal of the butterfly valve drive motor, and the other normally open contact of the other set of contacts of the forward switch unit is connected to the motor's operating power supply. The first power supply can be a 3V DC power supply, the second power supply can be a 12V DC power supply, and the motor's operating power supply can be a 24V DC power supply, a 36V DC power supply, a 48V DC power supply, or a 110V DC power supply, etc.

[0035] The stop switch S2 is a normally closed switch. When the stop switch S2 is not open, and the knife throw of the forward / reverse switch S1 is in the first stationary position, the first AND gate U1 outputs a high level, that is, the controlled terminal of the forward switch unit is at a high level, the forward switch unit is turned on, the two sets of normally open contacts of the forward switch unit are attracted, the butterfly valve drive motor is energized and rotates forward, and the electrically controlled butterfly valve opens under the drive of the butterfly valve drive motor. When the stop switch S2 is not open, and the knife throw of the forward / reverse switch S1 is in the second stationary position, the second AND gate U2 outputs a high level, that is, the controlled terminal of the reverse switch unit is at a high level, the reverse switch unit is turned on, the two sets of normally open contacts of the reverse switch unit are attracted, the butterfly valve drive motor is energized and reverses, and the electrically controlled butterfly valve closes under the drive of the butterfly valve drive motor. When the stop switch S2 is pressed, both the first AND gate U1 and the second AND gate U2 output low-level signals. The controlled terminals of the forward and reverse switch units are both in a low-level state, and neither the forward nor reverse switch units are triggered. The butterfly valve drive motor loses power and stops.

[0036] In some embodiments, the system further includes a first signal amplifier U3 and a second signal amplifier U4. The input terminal of the first signal amplifier U3 is electrically connected to the output terminal of the first AND gate U1, and the output terminal of the first signal amplifier U3 is electrically connected to the control terminal of the forward rotation switch unit. The input terminal of the second signal amplifier U4 is electrically connected to the output terminal of the second AND gate U2, and the output terminal of the second signal amplifier U4 is electrically connected to the control terminal of the reverse rotation switch unit.

[0037] By setting a first signal amplifier U3 and a second signal amplifier U4, the first signal amplifier U3 amplifies the output signal of the first AND gate U1, and the second signal amplifier U4 amplifies the output signal of the second AND gate U2, thereby improving the driving capability of the output signals of the first AND gate U1 and the second AND gate U2.

[0038] like Figure 2As shown, in some embodiments, the first signal amplifier U3 includes a first operational amplifier U5, a first resistor R1, and a second resistor R2. The non-inverting input of the first operational amplifier U5 is electrically connected to the output of the first AND gate U1. One end of the first resistor R1 is electrically connected to the output of the first operational amplifier U5, and the other end of the first resistor R1 is electrically connected to both the inverting input of the first operational amplifier U5 and one end of the second resistor R2. The other end of the second resistor R2 is grounded. The output of the first operational amplifier U5 is electrically connected to the control terminal of the forward rotation switch unit. The first signal amplifier U3 is a non-inverting amplifier, and the voltage Vout at the output of the first operational amplifier U5 is Vout = (1 + R1 / R2)Vi n, where R1 represents the voltage value of the first resistor R1, R2 represents the voltage value of the second resistor R2, and Vi n represents the voltage value at the non-inverting input of the first operational amplifier U5.

[0039] like Figure 3 As shown, in some embodiments, the second signal amplifier U4 includes a second operational amplifier U6, a third resistor R3, and a fourth resistor R4. The non-inverting input of the second operational amplifier U6 is electrically connected to the output of the second AND gate U2. One end of the third resistor R3 is electrically connected to the output of the second operational amplifier U6, and the other end of the third resistor R3 is electrically connected to both the inverting input of the second operational amplifier U6 and one end of the fourth resistor R4. The other end of the fourth resistor R4 is grounded. The output of the second operational amplifier U6 is electrically connected to the control terminal of the inverting switch unit. The second signal amplifier U4 is the same non-inverting amplifier as the first signal amplifier U3, and its amplification factor is also the same.

[0040] In some other embodiments, the forward rotation switch unit includes a first transistor Q1, a fifth resistor R5, a sixth resistor R6, and a first relay K1; one end of the fifth resistor R5 is electrically connected to the output terminal of the first operational amplifier U5, and the other end of the fifth resistor R5 is electrically connected to the base of the first transistor Q1 and one end of the sixth resistor R6, respectively. The other end of the sixth resistor R6 and the emitter of the first transistor Q1 are both grounded. One end of the coil of the first relay K1 is connected to the second power supply, and the other end of the coil of the first relay K1 is electrically connected to the collector of the first transistor Q1. The first relay K1 includes two sets of contacts, each set including two normally open contacts. One normally open contact of one set of contacts of the forward rotation switch unit is connected to the motor operating power supply, and the other normally open contact of one set of contacts of the forward rotation switch unit is electrically connected to a power input terminal of the butterfly valve drive motor. One normally open contact of the other set of contacts of the forward rotation switch unit is grounded, and the other normally open contact of the other set of contacts of the forward rotation switch unit is electrically connected to another power input terminal of the butterfly valve drive motor.

[0041] When the high-level signal output by the first AND gate U1 is amplified by the first signal amplifier U3, the base of the first transistor Q1 is at a high level, the first transistor Q1 is turned on, the coil of the first relay K1 is energized, the normally open contact of the first relay K1 is attracted, the butterfly valve drive motor is energized, and the electrically controlled butterfly valve is opened.

[0042] In some embodiments, the forward rotation switch unit further includes a forward rotation limit switch S3, one end of which is connected to the second power supply, and the other end of which is electrically connected to one end of the coil of the first relay K1.

[0043] By setting a forward rotation limit switch S3, the forward rotation limit switch S3 is installed at the limit position on the opening side of the electrically controlled butterfly valve. When the valve shaft of the electrically controlled butterfly valve rotates to the opening side, it will trigger the forward rotation limit switch S3 when it reaches the limit position. The forward rotation limit switch S3 will be disconnected, the coil of the first relay K1 will be de-energized, the butterfly valve drive motor will be de-energized, and the forward rotation will stop.

[0044] In some embodiments, the forward rotation switch unit further includes a first diode D1. The cathode of the first diode D1 is electrically connected to one end of the coil of the first relay K1, and the anode of the first diode D1 is electrically connected to the other end of the coil of the first relay K1. Connecting the first diode D1 across the coil of the first relay K1 primarily serves to absorb inrush current and protect other components in the circuit from damage. When the electromagnetic coil is de-energized, due to the principle of electromagnetic induction, a certain amount of energy is stored in the coil. If the power is directly cut off, a high back electromotive force (EMF) will be generated across the coil, potentially damaging the coil or other electronic components. By connecting a diode in parallel across the coil, the unidirectional conductivity of the diode can be utilized to release the energy in the coil, thereby preventing the generation of back EMF and protecting other components in the circuit.

[0045] In some other embodiments, the reversing switch unit includes a second transistor Q2, a seventh resistor R7, an eighth resistor R8, and a second relay K2. One end of the seventh resistor R7 is electrically connected to the output of the first operational amplifier U5, and the other end of the seventh resistor R7 is electrically connected to the base of the first transistor Q1 and one end of the eighth resistor R8. The other end of the eighth resistor R8 and the emitter of the first transistor Q1 are both grounded. One end of the coil of the second relay K2 is connected to the second power supply, and the other end of the coil of the second relay K2 is electrically connected to the collector of the first transistor Q1. The second relay K2 includes two sets of contacts of the reversing switch unit. When the high-level signal output by the second AND gate U2 is amplified by the second signal amplifier U4, the base of the second transistor Q2 is at a high level, the second transistor Q2 is turned on, the coil of the second relay K2 is energized, the normally open contact of the second relay K2 is attracted, the butterfly valve drive motor is energized, and the electrically controlled butterfly valve is closed.

[0046] In some embodiments, the reversing switch unit further includes a reversing limit switch S4. One end of the reversing limit switch S4 is connected to the second power supply, and the other end of the reversing limit switch S4 is electrically connected to one end of the coil of the second relay K2. By setting the reversing limit switch S4, it is installed at the extreme position on the closed side of the electrically controlled butterfly valve. When the valve shaft of the electrically controlled butterfly valve rotates towards the closed side, it triggers the reversing limit switch S4 when it reaches the extreme position. The reversing limit switch S4 is then disconnected, the coil of the second relay K2 is de-energized, the butterfly valve drive motor is de-energized, and the reversing stops.

[0047] Two limit blocks can be installed on the valve shaft of the electrically controlled butterfly valve. The two limit blocks are respectively located on both sides of the valve shaft. The forward limit switch S3 and the reverse limit switch S4 are both located on both sides of the valve shaft. When one of the two limit blocks triggers the forward limit switch S3, the butterfly valve drive motor loses power and stops forward rotation; when the other limit block triggers the reverse limit switch S4, the butterfly valve drive motor loses power and stops reverse rotation.

[0048] In some embodiments, the reversing switch unit further includes a second diode D2. The cathode of the second diode D2 is electrically connected to one end of the coil of the second relay K2, and the anode of the second diode D2 is electrically connected to the other end of the coil of the second relay K2. Connecting the second diode D2 across the coil of the second relay K2 primarily serves to absorb inrush current and protect other components in the circuit from damage. When the electromagnetic coil is de-energized, due to the principle of electromagnetic induction, a certain amount of energy is stored in the coil. If the power is directly cut off, a high back electromotive force (EMF) will be generated across the coil, potentially damaging the coil or other electronic components. By connecting a diode in parallel across the coil, the unidirectional conductivity of the diode can be used to release the energy in the coil, thereby preventing the generation of back EMF and protecting other components in the circuit.

[0049] In some embodiments, the microcontroller circuit further includes an emergency stop switch S4, which is a normally closed switch. One end of the emergency stop switch S4 is connected to a second power supply, and the other end of the emergency stop switch S4 is electrically connected to one end of the forward limit switch S3 and one end of the reverse limit switch S4, respectively. By setting the emergency stop switch S4, in an emergency, pressing the emergency stop switch S4 can cut off the power supply to the coils of the first relay K1 and the second relay K2, thereby causing the butterfly valve drive motor to stop rotating due to power loss, regardless of whether it rotates forward or reverse.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the concept and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A microcontroller circuit for an electrically controlled butterfly valve, characterized in that: It includes a forward / reverse switching switch (S1), a stop switch (S2), a first AND gate (U1), a second AND gate (U2), a forward switching unit, and a reverse switching unit, wherein the forward switching unit and the reverse switching unit are both electronically controlled switching units; The forward / reverse switching switch (S1) is a single-pole double-throw switch. The single-pole double-throw switch includes a moving terminal, a first stationary terminal, and a second stationary terminal. The moving terminal of the single-pole double-throw switch is connected to a first power supply. The first stationary terminal of the single-pole double-throw switch is electrically connected to an input terminal of the first AND gate (U1). The second stationary terminal of the single-pole double-throw switch is electrically connected to an input terminal of the second AND gate (U2). The stop switch (S2) is a normally closed switch. One end of the stop switch (S2) is connected to the first power supply, and the other end of the stop switch (S2) is electrically connected to the other input terminal of the first AND gate (U1) and the other input terminal of the second AND gate (U2). The output terminal of the first AND gate (U1) is electrically connected to the control terminal of the forward rotation switch unit. The positive terminal of the power input terminal of the forward rotation switch unit is connected to a second power supply, and the negative terminal of the power input terminal of the forward rotation switch unit is grounded. The forward rotation switch unit includes two sets of contacts, each set of contacts including two normally open contacts. One normally open contact of one set of contacts of the forward rotation switch unit is connected to the motor operating power supply, and the other normally open contact of one set of contacts of the forward rotation switch unit is electrically connected to one power input terminal of the butterfly valve drive motor. One normally open contact of the other set of contacts of the forward rotation switch unit is grounded, and the other normally open contact of the other set of contacts of the forward rotation switch unit is electrically connected to another power input terminal of the butterfly valve drive motor. The output terminal of the second AND gate (U2) is electrically connected to the control terminal of the reverse switch unit. The positive terminal of the power input terminal of the reverse switch unit is connected to the second power supply, and the negative terminal of the power input terminal of the reverse switch unit is grounded. The reverse switch unit includes two sets of contacts, each set of contacts including two normally open contacts. One normally open contact of one set of contacts of the reverse switch unit is electrically connected to one power input terminal of the butterfly valve drive motor, and the other normally open contact of one set of contacts of the reverse switch unit is grounded. One normally open contact of the other set of contacts of the reverse switch unit is electrically connected to another power input terminal of the butterfly valve drive motor, and the other normally open contact of the other set of contacts of the forward switch unit is connected to the motor's operating power supply.

2. The microcontroller circuit of the electrically controlled butterfly valve according to claim 1, characterized in that: It also includes a first signal amplifier (U3) and a second signal amplifier (U4). The input terminal of the first signal amplifier (U3) is electrically connected to the output terminal of the first AND gate (U1), and the output terminal of the first signal amplifier (U3) is electrically connected to the control terminal of the forward switch unit. The input terminal of the second signal amplifier (U4) is electrically connected to the output terminal of the second AND gate (U2), and the output terminal of the second signal amplifier (U4) is electrically connected to the control terminal of the reverse switch unit.

3. The microcontroller circuit of the electrically controlled butterfly valve according to claim 2, characterized in that: The first signal amplifier (U3) includes a first operational amplifier (U5), a first resistor (R1), and a second resistor (R2). The non-inverting input of the first operational amplifier (U5) is electrically connected to the output of the first AND gate (U1). One end of the first resistor (R1) is electrically connected to the output of the first operational amplifier (U5). The other end of the first resistor (R1) is electrically connected to the inverting input of the first operational amplifier (U5) and one end of the second resistor (R2). The other end of the second resistor (R2) is grounded. The output of the first operational amplifier (U5) is electrically connected to the control terminal of the forward rotation switch unit.

4. The microcontroller circuit of the electrically controlled butterfly valve according to claim 3, characterized in that: The second signal amplifier (U4) includes a second operational amplifier (U6), a third resistor (R3), and a fourth resistor (R4). The non-inverting input of the second operational amplifier (U6) is electrically connected to the output of the second AND gate (U2). One end of the third resistor (R3) is electrically connected to the output of the second operational amplifier (U6), and the other end of the third resistor (R3) is electrically connected to both the inverting input of the second operational amplifier (U6) and one end of the fourth resistor (R4). The other end of the fourth resistor (R4) is grounded. The output of the second operational amplifier (U6) is electrically connected to the control terminal of the inverting switch unit.

5. The microcontroller circuit of the electrically controlled butterfly valve according to claim 4, characterized in that: The forward rotation switch unit includes a first transistor (Q1), a fifth resistor (R5), a sixth resistor (R6), and a first relay (K1). One end of the fifth resistor (R5) is electrically connected to the output terminal of the first operational amplifier (U5), and the other end of the fifth resistor (R5) is electrically connected to the base of the first transistor (Q1) and one end of the sixth resistor (R6). The other end of the sixth resistor (R6) and the emitter of the first transistor (Q1) are both grounded. One end of the coil of the first relay (K1) is connected to the second power supply, and the other end of the coil of the first relay (K1) is electrically connected to the collector of the first transistor (Q1). The first relay (K1) includes two sets of contacts of the forward rotation switch unit.

6. The microcontroller circuit of the electrically controlled butterfly valve according to claim 5, characterized in that: The forward rotation switch unit also includes a forward rotation limit switch (S3), one end of which is connected to the second power supply, and the other end of which is electrically connected to one end of the coil of the first relay (K1).

7. The microcontroller circuit of the electrically controlled butterfly valve according to claim 5, characterized in that: The forward rotation switch unit also includes a first diode (D1), the negative terminal of the first diode (D1) is electrically connected to one end of the coil of the first relay (K1), and the positive terminal of the first diode (D1) is electrically connected to the other end of the coil of the first relay (K1).

8. The microcontroller circuit of the electrically controlled butterfly valve according to claim 5, characterized in that: The inverting switch unit includes a second transistor (Q2), a seventh resistor (R7), an eighth resistor (R8), and a second relay (K2). One end of the seventh resistor (R7) is electrically connected to the output terminal of the first operational amplifier (U5), and the other end of the seventh resistor (R7) is electrically connected to the base of the first transistor (Q1) and one end of the eighth resistor (R8). The other end of the eighth resistor (R8) and the emitter of the first transistor (Q1) are both grounded. One end of the coil of the second relay (K2) is connected to the second power supply, and the other end of the coil of the second relay (K2) is electrically connected to the collector of the first transistor (Q1). The second relay (K2) includes two sets of contacts of the inverting switch unit.

9. The microcontroller circuit of the electrically controlled butterfly valve according to claim 8, characterized in that: The reversing switch unit also includes a reversing limit switch (S4), one end of which is connected to the second power supply, and the other end of which is electrically connected to one end of the coil of the second relay (K2).

10. The microcontroller circuit of the electrically controlled butterfly valve according to claim 8, characterized in that: The reversing switch unit further includes a second diode (D2), the negative terminal of which is electrically connected to one end of the coil of the second relay (K2), and the positive terminal of which is electrically connected to the other end of the coil of the second relay (K2).

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