Control circuit of digital intelligent electric actuator

Abstract

The utility model provides a control circuit of a digital intelligent electric actuator, which comprises a power supply and external connection wire board circuit, an electric actuator main control circuit, a motor driving filter circuit, a data encryption storage circuit, an encoder signal input circuit, an infrared signal receiving circuit, a 485 communication circuit and a key input circuit which are in power supply connection. The output end of the electric actuator main control circuit is connected with the external connection wire board circuit, the motor drive filter circuit and the data encryption storage circuit, and the output end of the motor drive filter circuit can be connected with a motor of the electric actuator. The input end of the electric actuator main control circuit is connected with the analog signal communication circuit, the encoder signal input circuit, the infrared signal receiving circuit, the 485 communication circuit and the key input circuit. The electric actuator has the advantages that high-precision and high-stability control of the electric actuator can be achieved, and error deviation caused by rotation inertia of a controlled valve is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuits, in particular to a control circuit of a digital intelligent electric actuator. Background Art

[0002] An electric actuator is a drive device that can provide linear or rotary motion. It utilizes a certain type of driving energy source and operates under a certain control signal. It receives a 4-20mA or 0-10mA DC current signal from the controller and converts it into a corresponding angular displacement or linear displacement to manipulate control mechanisms such as valves and dampers to achieve automatic control. Electric actuators have excellent anti-deviation capabilities, and the output thrust or torque is essentially constant. This can effectively overcome the unbalanced force of the medium and achieve accurate control of process parameters, so the control accuracy is higher than that of pneumatic actuators. If equipped with a servo amplifier, it is easy to achieve the interchange of positive and negative effects, and it is also easy to set the valve position state of the off signal. In the event of a fault, the actuator will remain in place, which is something that pneumatic actuators cannot do. Pneumatic actuators must be protected by a combined protection system.

[0003] Electric actuators are also called valve actuators or electric actuators. In the prior art, electric actuators are generally controlled by analog signals and driven by three-phase asynchronous motors. However, this control method has a drawback: due to the rotational inertia of the controlled valve and the quantized control of the analog signal, there can be a small deviation between the actual rotational position of the controlled valve and the initial position of the electric actuator for the next start and stop. This is not a significant issue in general production processes where precision is not required. However, in some production processes requiring extremely precise control, this control method cannot meet the needs of users. For example, in order to more accurately control the degree of valve opening and achieve precise control of the specific flow rate of the fluid, thereby achieving precise temperature control, precise pressure control, and precise flow control, the slight deviation generated by using analog signals to control three-phase asynchronous motors is still not precise enough for users, and the user experience is not good enough. Utility Model Content

[0004] To solve the problems in the prior art, the present utility model provides a control circuit for a digital intelligent electric actuator. By arranging a power supply, an external wiring board circuit, an electric actuator main control circuit, a motor drive filter circuit, a data encryption storage circuit, an analog signal communication circuit, an encoder signal input circuit, an infrared signal receiving circuit, a 485 communication circuit, and a key input circuit that cooperate with each other in the control circuit of the digital intelligent electric actuator, the electric actuator main control circuit can control the motor drive filter circuit to drive the operation of the electric actuator motor according to the signal transmitted by the analog signal communication circuit, the signal transmitted by the encoder signal input circuit, the signal transmitted by the infrared signal receiving circuit, the signal transmitted by the 485 communication circuit, and the information entered by the key input circuit. The electric actuator can accept multiple signals for intelligent control, with high control accuracy, high reliability and stability. At the same time, a software algorithm is used to implement similar frequency conversion control technology, thereby reducing the error deviation caused by the rotational inertia of the controlled valve and saving electricity. This greatly improves the user experience and solves the problem that the electric actuator in the prior art uses an analog signal quantization control method, which will produce small error deviation and is difficult to meet people's practical needs.

[0005] The utility model provides a control circuit of a digital intelligent electric actuator, comprising a power supply, an external connecting line board circuit, an electric actuator main control circuit, a motor drive filter circuit, a data encryption storage circuit, an analog signal communication circuit, an encoder signal input circuit, an infrared signal receiving circuit, a 485 communication circuit and a key input circuit, wherein the output end of the power supply is connected to the external connecting line board circuit, the electric actuator main control circuit, the motor drive filter circuit, the data encryption storage circuit, the encoder signal input circuit, the infrared signal receiving circuit, the 485 communication circuit and the key input circuit for power supply, and the output end of the electric actuator main control circuit is connected to the input end of the external connecting line board circuit, the input end of the motor drive filter circuit, the data encryption storage circuit, the encoder signal input circuit, the infrared signal receiving circuit, the 485 communication circuit and the key input circuit for power supply. The input end of the storage circuit is connected, the output end of the external connection board circuit can be connected to an external connection board, the output end of the motor drive filter circuit can be connected to the motor of the electric actuator, the input end of the electric actuator main control circuit is connected to the output end of the analog signal communication circuit, the output end of the encoder signal input circuit, the output end of the infrared signal receiving circuit, the output end of the 485 communication circuit, and the output end of the key input circuit. The electric actuator main control circuit can control the motor drive filter circuit to drive the operation of the motor of the electric actuator according to the signal transmitted by the analog signal communication circuit, the signal transmitted by the encoder signal input circuit, the signal transmitted by the infrared signal receiving circuit, the signal transmitted by the 485 communication circuit, and the information entered by the key input circuit.

[0006] The utility model is further improved. The main control chip U4 is provided in the main control circuit of the electric actuator. The main control chip U4 is provided with 100 pins. The 6th, 11th, 23rd, 28th, 50th, 75th and 100th pins of the main control chip U4 are connected to the output end of the power supply, the 78th, 80th, 77th, 58th, 59th, 60th, 61st, 62nd, 63rd, 64th, 65th, 66th, 67th and 71st pins of the main control chip U4 are connected to the input end of the external connecting line board circuit, the 70th pin of the main control chip U4 is connected to the input end of the motor drive filter circuit, and the 10th pin of the main control chip U4 is connected to the input end of the motor drive filter circuit. Pins 51, 52, 53, 54, 55, and 56 are connected to the input end of the data encryption storage circuit, pins 2, 3, and 4 of the main control chip U4 are connected to the output end of the key input circuit, pins 91, 92, and 93 of the main control chip U4 are connected to the output end of the encoder signal input circuit, pin 79 of the main control chip U4 is connected to the output end of the analog signal communication circuit, pin 82 of the main control chip U4 is connected to the output end of the infrared signal receiving circuit, and pins 46, 68, and 69 of the main control chip U4 are connected to the output end of the 485 communication circuit.

[0007] The utility model is further improved. The data encryption storage circuit is provided with an encryption storage chip U1, a transistor Q6, a transistor Q5, a transistor Q1, a resistor R75, a capacitor C14, a resistor R76, a capacitor C30, a resistor R29, a resistor R31 and a resistor R37. The encryption storage chip U1 is provided with 8 pins. The first pin of the encryption storage chip U1 is connected to the collector of the transistor Q6. The base of the transistor Q6 is connected to the 52nd pin of the main control chip U4 through the resistor R29. The third pin of the encryption storage chip U1 is connected to one end of the resistor R75 and one end of the capacitor C14. The other end of the resistor R75 is connected to the 51st pin of the main control chip U4. The fourth pin of the encryption storage chip U1 is connected to the base of the transistor Q1 through the resistor R37. The collector of the transistor Q1 is connected to the 52nd pin of the main control chip U4. The electrode is connected to the 53rd pin of the main control chip U4, the 5th pin of the encryption storage chip U1 is connected to the collector of the transistor Q5, the base of the transistor Q5 is connected to the 54th pin of the main control chip U4 through the resistor R31, the 6th pin of the encryption storage chip U1 is connected to the 55th pin of the main control chip U4, the 7th pin of the encryption storage chip U1 is connected to one end of the resistor R76, the other end of the resistor R76 is connected to one end of the capacitor C30 and the 56th pin of the main control chip U4, the 8th pin of the encryption storage chip U1 is connected to the output end of the power supply, the 2nd pin of the encryption storage chip U1, the emitter of the transistor Q6, the emitter of the transistor Q5, the emitter of the transistor Q1, the other end of the capacitor C14, and the other end of the capacitor C30 are grounded.

[0008] The utility model is further improved. The external connecting line board circuit is provided with an interface FPC3, and the interface FPC3 is provided with 30 pins. The 6th and 7th pins of the interface FPC3 are connected to the input end of the 485 communication circuit, and the 13th, 15th, 16th, 17th, 18th, 19th, 20th, 21st, 22nd, 23rd, 24th, 25th, 26th, and 28th pins of the interface FPC3 are respectively connected to the 78th, 80th, 77th, 58th, 59th, 60th, 61st, 62nd, 63rd, 64th, 65th, 66th, 67th, and 71st pins of the main control chip U4. The 14th pin of the interface FPC3 is connected to the analog The input end of the signal communication circuit is connected, and the 27th pin of the interface FPC3 is connected to the input end of the motor drive filter circuit; the motor drive filter circuit is provided with a transistor Q15, a resistor R4 and a resistor R60, wherein the collector of the transistor Q15 is connected to one end of the resistor R4 and the 27th pin of the interface FPC3, the other end of the resistor R4 is connected to the output end of the power supply, the base of the transistor Q15 is connected to one end of the resistor R60, the other end of the resistor R60 is connected to the 70th pin of the main control chip U4, and the emitter of the transistor Q15 is grounded.

[0009] The utility model is further improved. The encoder signal input circuit is provided with an encoder interface FPC4, an anti-surge chip TV1, a transistor Q3, a resistor R12, a transistor Q2, a resistor R23, a transistor Q4 and a resistor R28, wherein the encoder interface FPC4 is provided with 8 pins, the anti-surge chip TV1 is provided with 6 pins, the 1st pin of the encoder interface FPC4 is connected to the output end of the power supply, the 2nd pin of the encoder interface FPC4 is connected to the 6th pin of the anti-surge chip TV1 and one end of the resistor R28, the other end of the resistor R28 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the 93rd pin of the main control chip U4, and the encoder interface FPC4 is provided with 8 pins. The 4th pin of the encoder interface FPC4 is connected to the 4th pin of the surge protection chip TV1 and one end of the resistor R23. The other end of the resistor R23 is connected to the base of the transistor Q2. The collector of the transistor Q2 is connected to the 92nd pin of the main control chip U4. The 6th pin of the encoder interface FPC4 is connected to the 3rd pin of the surge protection chip TV1 and one end of the resistor R12. The other end of the resistor R12 is connected to the base of the transistor Q3. The collector of the transistor Q3 is connected to the 91st pin of the main control chip U4. The 8th pin of the encoder interface FPC4, the 2nd pin of the surge protection chip TV1, the emitter of the transistor Q3, the emitter of the transistor Q2, and the emitter of the transistor Q4 are grounded.

[0010] The utility model is further improved. The analog signal communication circuit is provided with a resistor R68 and a capacitor C29, wherein one end of the resistor R68 is connected to the 14th pin of the interface FPC3, the other end of the resistor R68 is connected to one end of the capacitor C29 and the 79th pin of the main control chip U4, and the other end of the capacitor C29 is grounded; the key input circuit is provided with a key SW1, a resistor R13, a key SW2, a resistor R14, a key SW3 and a resistor R15, wherein one end of the key SW1 is connected to the resistor One end of R13 is connected to the 4th pin of the main control chip U4, one end of the button SW2 is connected to one end of the resistor R14 and the 3rd pin of the main control chip U4, one end of the button SW3 is connected to one end of the resistor R15 and the 2nd pin of the main control chip U4, the other end of the resistor R13, the other end of the resistor R14, and the other end of the resistor R15 are connected to the output end of the power supply, and the other end of the button SW1, the other end of the button SW2, and the other end of the button SW3 are grounded.

[0011] The present utility model is further improved. The infrared signal receiving circuit is provided with an infrared signal receiving chip LED8 and a resistor R57, wherein the infrared signal receiving chip LED8 is provided with 4 pins, the 4th pin of the infrared signal receiving chip LED8 is connected to the output end of the power supply through the resistor R57, and the 3rd pin of the infrared signal receiving chip LED8 is connected to the 82nd pin of the main control chip U4; the 485 communication circuit is provided with a 485 communication chip U8, and the 485 communication chip U8 is provided with 8 pins, the 1st, 2nd and 4th pins of the 485 communication chip U8 are respectively connected to the 69th, 46th and 68th pins of the main control chip U4, and the 6th and 7th pins of the 485 communication chip U8 are respectively connected to the 7th and 6th pins of the interface FPC3.

[0012] The present utility model is further improved and also includes an LED light prompt circuit and an LCD display circuit. The input end of the LED light prompt circuit and the input end of the LCD display circuit are connected to the output end of the main control circuit of the electric actuator. The LED light prompt circuit is provided with a light-emitting diode LED12, a resistor R65, a light-emitting diode LED13, a resistor R66, a light-emitting diode LED14, a resistor R67, a light-emitting diode LED9 and a resistor R55. The positive pole of the light-emitting diode LED12, the positive pole of the light-emitting diode LED13, the positive pole of the light-emitting diode LED14 and the positive pole of the light-emitting diode LED19 are connected to the output end of the power supply, the cathode of the light-emitting diode LED12 is connected to the 83rd pin of the main control chip U4 through the resistor R65, the cathode of the light-emitting diode LED13 is connected to the 84th pin of the main control chip U4 through the resistor R66, the cathode of the light-emitting diode LED14 is connected to the 85th pin of the main control chip U4 through the resistor R67, and the cathode of the light-emitting diode LED9 is connected to the 86th pin of the main control chip U4 through the resistor R67. The LCD display circuit is provided with an LCD display interface FPC2, a resistor R3, a resistor R45, a resistor R46, a resistor R47 and a resistor R48, wherein the LCD display interface FPC2 has 32 pins, and the 5th, 6th, 11th, 12th, 13th, 14th, 15th and 28th pins of the LCD display interface FPC2 are connected to the output end of the power supply, and the 2nd pin of the LCD display interface FPC2 is connected to the main control chip U4 through the resistor R48. The 86th pin of the LCD display interface FPC2 is connected to the 87th pin of the main control chip U4 through the resistor R47, the 4th pin of the LCD display interface FPC2 is connected to the 88th pin of the main control chip U4 through the resistor R3, the 7th pin of the LCD display interface FPC2 is connected to the 89th pin of the main control chip U4 through the resistor R45, and the 8th pin of the LCD display interface FPC2 is connected to the 90th pin of the main control chip U4 through the resistor R46.

[0013] The utility model is further improved and also includes a power-off reset circuit, the output end of the power-off reset circuit is connected to the input end of the electric actuator main control circuit, and a power-off reset interface FPC5 is provided in the power-off reset circuit. The power-off reset interface FPC5 has 9 pins, the 5th pin of the power-off reset interface FPC5 is connected to the output end of the power supply, and the 2nd, 3rd, 4th, 6th and 7th pins of the power-off reset interface FPC5 are respectively connected to the 40th, 41st, 42nd, 43rd and 44th pins of the main control chip U4.

[0014] The utility model is further improved. The model of the main control chip U4 is HK32F103VET6 or STM32F103VE or STM32F103VD or STM32F103VF or STM32F103VG or GD32F103VE or GD32F103VD or GD32F103VG or HK32F103VE or HK32F103VD, the model of the encryption storage chip U1 is THKU-001, the model of the infrared signal receiving chip LED8 is IRM-H936 / TR2, and the power supply is a 3.3V constant voltage power supply.

[0015] Compared with the prior art, the beneficial effects of the present invention are: providing a control circuit for a digital intelligent electric actuator, by arranging a power supply, an external connection board circuit, an electric actuator main control circuit, a motor drive filter circuit, a data encryption storage circuit, an analog signal communication circuit, an encoder signal input circuit, an infrared signal receiving circuit, a 485 communication circuit and a key input circuit that cooperate with each other in the control circuit of the digital intelligent electric actuator, the electric actuator main control circuit can control the motor drive filter circuit to drive the electric actuator's motor operation according to the signal transmitted by the analog signal communication circuit, the signal transmitted by the encoder signal input circuit, the signal transmitted by the infrared signal receiving circuit, the signal transmitted by the 485 communication circuit, and the information typed by the key input circuit, and can achieve high-precision and high-stability control of the electric actuator. The digital intelligent electric actuator disdains the traditional analog signal quantization control method and adopts a new digital signal control technology, which can The position control requirements of the electric actuator are converted into the precise number of motor rotations, and the motor rotation speed is controlled to meet the mechanical characteristics of the valve when it is opened and closed, which greatly reduces the error deviation caused by the rotational inertia of the controlled valve; the new digital signal control technology is used to improve the control accuracy of the electric actuator on the fluid. For example, in the burner industry, the furnace temperature control accuracy is greatly improved, saving fuel; the intelligent diagnostic capability of the electric actuator is improved. The electric actuator can detect the signal conditions, mechanical failures, operating parameters, etc. on site, which are intuitively visible, reducing the difficulty of on-site fault handling and improving production efficiency; the debugging difficulty of the electric actuator is reduced, and the debugging time is reduced from the traditional minimum of 25 minutes / unit to less than 5 minutes / unit; it can also realize multiple signal compatibility combinations, adapt to a wider environment, greatly improve the user experience, and solve the problem that the electric actuator in the existing technology uses analog signal quantization control method, which will produce small error deviations and is difficult to meet people's practical needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a principle block diagram of the control circuit of a digital intelligent electric actuator of the present utility model;

[0018] Figure 2 This is a circuit diagram of the main control circuit of the electric actuator of the present utility model;

[0019] Figure 3 A circuit diagram of a data encryption storage circuit of the present utility model;

[0020] Figure 4 A circuit diagram of an external connecting line board circuit of the present utility model;

[0021] Figure 5 This is a circuit diagram of the motor drive filter circuit of the present utility model;

[0022] Figure 6 This is a circuit diagram of the encoder signal input circuit of the present utility model;

[0023] Figure 7 A circuit diagram of an analog signal communication circuit of the present utility model;

[0024] Figure 8 This is a circuit diagram of the key input circuit of the utility model;

[0025] Figure 9 This is a circuit diagram of the infrared signal receiving circuit of the present utility model;

[0026] Figure 10 This is a circuit diagram of the 485 communication circuit of the present utility model;

[0027] Figure 11 This is a circuit diagram of the LED light prompt circuit of the present utility model;

[0028] Figure 12 This is a circuit diagram of the LCD display circuit of the present utility model;

[0029] Figure 13 This is a circuit diagram of the power-off reset circuit of the utility model. DETAILED DESCRIPTION

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for describing particular embodiments only and is not intended to be limiting of the application; the present application is well suited to carry out various embodiments as broadly described herein and the above and below description provided in support of the examples attached herewith. As used in explaining the application, the following terms shall have the below meanings.

[0031] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with one another.

[0032] In order to make the technical personnel of the present technology better understand the present application scheme, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings.

[0033] As Figures 1-13As shown, the utility model provides a control circuit of a digital intelligent electric actuator, including a power supply, an external connecting wire board circuit, an electric actuator main control circuit, a motor drive filter circuit, a data encryption storage circuit, an analog signal communication circuit, an encoder signal input circuit, an infrared signal receiving circuit, a 485 communication circuit and a key input circuit. The output end of the power supply is connected to the external connecting wire board circuit, the electric actuator main control circuit, the motor drive filter circuit, the data encryption storage circuit, the encoder signal input circuit, the infrared signal receiving circuit, the 485 communication circuit and the key input circuit. The output end of the electric actuator main control circuit is connected to the input end of the external connecting wire board circuit, the input end of the motor drive filter circuit and the input end of the data encryption storage circuit. The output end of the external connecting wire board circuit can be connected to an external wiring board. The output end of the motor drive filter circuit can be connected to the motor of the electric actuator. The input end of the electric actuator main control circuit is connected to the output end of the analog signal communication circuit, the output end of the encoder signal input circuit, the output end of the infrared signal receiving circuit, the output end of the 485 communication circuit and the output end of the key input circuit. The power supply is a 3.3V constant voltage power supply. In this embodiment, the main control circuit of the electric actuator can control the motor drive filter circuit to drive the motor operation of the electric actuator according to the signal transmitted by the analog signal communication circuit, the signal transmitted by the encoder signal input circuit, the signal transmitted by the infrared signal receiving circuit, the signal transmitted by the 485 communication circuit, and the information typed by the key input circuit, so as to achieve high-precision and high-stability control of the electric actuator. The digital intelligent electric actuator disdains the traditional analog signal quantization control method and adopts a new digital signal control technology, which can convert the position control requirements of the electric actuator into the precise number of motor rotations, and achieve the force required for valve opening and closing by controlling the motor rotation speed. The new digital signal control technology improves the control accuracy of electric actuators over fluids. For example, in the burner industry, it greatly improves the temperature control accuracy and saves fuel. The intelligent diagnostic capability of electric actuators is improved. Electric actuators can detect on-site signal conditions, mechanical faults, operating parameters, etc., which are intuitive and easy to see, reducing the difficulty of on-site fault handling and improving production efficiency. The debugging difficulty of electric actuators is reduced, and the debugging time is reduced from the traditional minimum of 25 minutes per unit to less than 5 minutes per unit. It can also realize multiple signal compatibility combinations, adapt to a wider range of environments, and greatly improve the user experience.

[0034] like Figure 2As shown, the main control circuit of the electric actuator is provided with a main control chip U4, the model of the main control chip U4 is HK32F103VET6 or STM32F103VE or STM32F103VD or STM32F103VF or STM32F103VG or GD32F103VE or GD32F103VD or GD32F103VG or HK32F103VE or HK32F103VD, the main control chip U4 has 100 pins, the 6th, 11th, 23rd, 28th, 50th, 75th, 100th pins of the main control chip U4 are connected to the output end of the power supply, the 78th, 80th, 77th, 58th, 59th, 60th, 61st, 62nd, 63rd, 64th, 65th, 66th pins of the main control chip U4 are connected to the output end of the power supply, Pins 67, 71 of the main control chip U4 are connected to the input of the external connection board circuit; pin 70 of the main control chip U4 is connected to the input of the motor drive filter circuit; pins 51, 52, 53, 54, 55, and 56 of the main control chip U4 are connected to the input of the data encryption storage circuit; pins 2, 3, and 4 of the main control chip U4 are connected to the output of the key input circuit; pins 91, 92, and 93 of the main control chip U4 are connected to the output of the encoder signal input circuit; pin 79 of the main control chip U4 is connected to the output of the analog signal communication circuit; pin 82 of the main control chip U4 is connected to the output of the infrared signal receiving circuit; and pins 46, 68, and 69 of the main control chip U4 are connected to the output of the 485 communication circuit. In this embodiment, the main control circuit of the electric actuator is used to control the motor drive filter circuit to drive the operation of the electric actuator motor based on signals transmitted by the analog signal communication circuit, signals transmitted by the encoder signal input circuit, signals transmitted by the infrared signal receiving circuit, signals transmitted by the 485 communication circuit, and information entered by the key input circuit.

[0035] like Figure 3As shown, the data encryption storage circuit is provided with an encryption storage chip U1, a transistor Q6, a transistor Q5, a transistor Q1, a resistor R75, a capacitor C14, a resistor R76, a capacitor C30, a resistor R29, a resistor R31 and a resistor R37. Among them, the model of the encryption storage chip U1 is THKU-001, and the encryption storage chip U1 has 8 pins. The first pin of the encryption storage chip U1 is connected to the collector of the transistor Q6, and the base of the transistor Q6 is connected to the 52nd pin of the main control chip U4 through the resistor R29. The third pin of the encryption storage chip U1 is connected to one end of the resistor R75 and one end of the capacitor C14. The other end of the resistor R75 is connected to the 51st pin of the main control chip U4. The fourth pin of the encryption storage chip U1 is connected to the base of the transistor Q1 through the resistor R37. The collector of transistor Q1 is connected to pin 53 of the main control chip U4. Pin 5 of the encryption storage chip U1 is connected to the collector of transistor Q5. The base of transistor Q5 is connected to pin 54 of the main control chip U4 via resistor R31. Pin 6 of the encryption storage chip U1 is connected to pin 55 of the main control chip U4. Pin 7 of the encryption storage chip U1 is connected to one end of resistor R76. The other end of resistor R76 is connected to one end of capacitor C30 and pin 56 of the main control chip U4. Pin 8 of the encryption storage chip U1 is connected to the output end of the power supply. Pin 2 of the encryption storage chip U1, the emitter of transistor Q6, the emitter of transistor Q5, the emitter of transistor Q1, the other end of capacitor C14, and the other end of capacitor C30 are grounded. In this embodiment, the encryption storage chip U1 is a memory chip with data encryption functionality. The data encryption storage circuit is used to store important data for access by the main control circuit of the electric actuator.

[0036] like Figure 4 and Figure 5As shown, the external connection board circuit is provided with an interface FPC3, which has 30 pins. The 6th and 7th pins of the interface FPC3 are connected to the input end of the 485 communication circuit, and the 13th, 15th, 16th, 17th, 18th, 19th, 20th, 21st, 22nd, 23rd, 24th, 25th, 26th, and 28th pins of the interface FPC3 are connected to the 78th, 80th, 77th, 58th, 59th, 60th, 61st, 62nd, 63rd, 64th, 65th, 66th, and 71st pins of the main control chip U4 respectively. The 14th pin of the interface FPC3 is connected to the module The input end of the analog signal communication circuit is connected, and the 27th pin of the interface FPC3 is connected to the input end of the motor drive filter circuit; the motor drive filter circuit is provided with a transistor Q15, a resistor R4 and a resistor R60, wherein the collector of the transistor Q15 is connected to one end of the resistor R4 and the 27th pin of the interface FPC3, the other end of the resistor R4 is connected to the output end of the power supply, the base of the transistor Q15 is connected to one end of the resistor R60, the other end of the resistor R60 is connected to the 70th pin of the main control chip U4, and the emitter of the transistor Q15 is grounded. In this embodiment, the external connection board circuit is used to connect to an external wiring board. The main functions of the wiring board include providing power for the board, processing analog signals and providing all interfaces required for user wiring. Among them, the USART_TX interface of the serial port is used for the main control chip U4 to send instructions to the analog signal module on the wiring board, and the USART_RX interface of the serial port is used for the main control chip U4 to receive signals sent from the analog signal module on the wiring board; the 15th pin of the interface FPC3 is connected to the 80th pin of the main control chip U4, and the forced valve closing signal input interface is for user connection and use; the 16th pin of the interface FPC3 is connected to the 77th pin of the main control chip U4, and the forced valve opening signal input interface is for user connection and use.The 17th pin of the interface FPC3 is connected with the 58th pin of the main control chip U4, a relay control interface, controlling the on-off of the relay on the terminal block; the 18th pin of the interface FPC3 is connected with the 59th pin of the main control chip U4, a relay control interface, controlling the on-off of the relay on the terminal block; the 19th pin of the interface FPC3 is connected with the 60th pin of the main control chip U4, a relay control interface, controlling the on-off of the relay on the terminal block; the 20th pin of the interface FPC3 is connected with the 61st pin of the main control chip U4, a relay control interface, controlling the on-off of the relay on the terminal block; the 21st pin of the interface FPC3 is connected with the 62nd pin of the main control chip U4, a motor drive alarm prompt pin; the 22nd pin of the interface FPC3 is connected with the 63rd pin of the main control chip U4, a motor drive enable pin; the 23rd pin of the interface FPC3 is connected with the 64th pin of the main control chip U4, a motor drive current peak value configuration 1 pin; the 24th pin of the interface FPC3 is connected with the 65th pin of the main control chip U4, a motor drive current peak value configuration 2 pin; the 25th pin of the interface FPC3 is connected with the 66th pin of the main control chip U4, a motor drive current peak value configuration 3 pin; the 26th pin of the interface FPC3 is connected with the 67th pin of the main control chip U4, a motor drive current peak value configuration 4 pin; the 27th pin of the interface FPC3 is connected with the emitter of the transistor Q15, a motor drive PWM input pin; the 28th pin of the interface FPC3 is connected with the 71st pin of the main control chip U4, a motor drive direction input pin.

[0037] As Figure 6As shown, the encoder signal input circuit is provided with an encoder interface FPC4, an anti-surge chip TV1, a transistor Q3, a resistor R12, a transistor Q2, a resistor R23, a transistor Q4 and a resistor R28, wherein the encoder interface FPC4 has 8 pins, the anti-surge chip TV1 has 6 pins, the 1st pin of the encoder interface FPC4 is connected to the output end of the power supply, the 2nd pin of the encoder interface FPC4 is connected to the 6th pin of the anti-surge chip TV1 and one end of the resistor R28, the other end of the resistor R28 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the 93rd pin of the main control chip U4, and the encoder interface FPC The 4th pin of 4 is connected to the 4th pin of the surge protection chip TV1 and one end of the resistor R23. The other end of the resistor R23 is connected to the base of the transistor Q2. The collector of the transistor Q2 is connected to the 92nd pin of the main control chip U4. The 6th pin of the encoder interface FPC4 is connected to the 3rd pin of the surge protection chip TV1 and one end of the resistor R12. The other end of the resistor R12 is connected to the base of the transistor Q3. The collector of the transistor Q3 is connected to the 91st pin of the main control chip U4. The 8th pin of the encoder interface FPC4, the 2nd pin of the surge protection chip TV1, the emitter of the transistor Q3, the emitter of the transistor Q2, and the emitter of the transistor Q4 are grounded. In this embodiment, the encoder signal input circuit is used to receive the ABZ signals sent by the encoder. The encoder interface FPC4 is an FPC connector with 8 pins and a pin spacing of 1 mm. The second pin of the encoder interface FPC4 is connected to the A-phase signal, receives the A-phase signal from the encoder, and is connected to the label INPUT_A#. The fourth pin of the encoder interface FPC4 is connected to the B-phase signal, receives the B-phase signal from the encoder, and is connected to the label INPUT_B#. The sixth pin of the encoder interface FPC4 is connected to the Z-phase signal, receives the Z-phase signal from the encoder, and is connected to the label INPUT_Z#.

[0038] like Figure 7 and Figure 8As shown, a resistor R68 and a capacitor C29 are provided in the analog signal communication circuit, wherein one end of the resistor R68 is connected to the 14th pin of the interface FPC3, the other end of the resistor R68 is connected to one end of the capacitor C29 and the 79th pin of the main control chip U4, and the other end of the capacitor C29 is grounded; a button SW1, a resistor R13, a button SW2, a resistor R14, a button SW3 and a resistor R15 are provided in the key input circuit, wherein one end of the button SW1 is connected to one end of the resistor R13 and the 4th pin of the main control chip U4, one end of the button SW2 is connected to one end of the resistor R14 and the 3rd pin of the main control chip U4, one end of the button SW3 is connected to one end of the resistor R15 and the 2nd pin of the main control chip U4, the other end of the resistor R13, the other end of the resistor R14 and the other end of the resistor R15 are connected to the output end of the power supply, and the other end of the button SW1, the other end of the button SW2 and the other end of the button SW3 are grounded. In this embodiment, the analog signal communication circuit is used to receive analog signals and transmit them to the main control circuit of the electric actuator, and the key input circuit is used to output control signals to the main control circuit of the electric actuator, wherein SW1 is the up key, whose main function is that when the actuator is under local control, pressing and holding the key will cause the actuator to run upward (i.e., pull the valve stem of the valve outward), and it will stop when the key is released; a short press (<1 second) in the menu indicates switching to the previous option; SW2 is the down key, whose main function is that when the actuator is under local control, pressing and holding the key will cause the actuator to run downward (i.e., push the valve stem of the valve inward), and it will stop when the key is released; a short press (<1 second) in the menu indicates switching to the next option; SW3 is a function key, whose main function is to enter the menu interface after long pressing (>1 second) when the actuator is in working state; a long press (>1 second) in the menu indicates confirmation.

[0039] like Figure 9 and Figure 10 As shown, the infrared signal receiving circuit includes an infrared signal receiving chip LED8 and a resistor R57. The infrared signal receiving chip LED8 is IRM-H936 / TR2 and has four pins. Pin 4 of the infrared signal receiving chip LED8 is connected to the output of the power supply via resistor R57, and pin 3 of the infrared signal receiving chip LED8 is connected to pin 82 of the main control chip U4. The 485 communication circuit includes a 485 communication chip U8. The 485 communication chip U8 has eight pins. Pins 1, 2, and 4 of the 485 communication chip U8 are connected to pins 69, 46, and 68 of the main control chip U4, respectively. Pins 6 and 7 of the 485 communication chip U8 are connected to pins 7 and 6 of the interface FPC3, respectively. In this embodiment, the infrared signal receiving circuit is used to receive infrared signals and transmit them to the main control circuit of the electric actuator. The 485 communication circuit is used to receive 485 communication signals and transmit them to the main control circuit of the electric actuator.

[0040] like Figure 11 and Figure 12 As shown, it also includes an LED light prompt circuit and an LCD display circuit. The input end of the LED light prompt circuit and the input end of the LCD display circuit are connected to the output end of the main control circuit of the electric actuator. The LED light prompt circuit is provided with a light-emitting diode LED12, a resistor R65, a light-emitting diode LED13, a resistor R66, a light-emitting diode LED14, a resistor R67, a light-emitting diode LED9 and a resistor R55. Among them, the positive electrode of the light-emitting diode LED12, the positive electrode of the light-emitting diode LED13, the positive electrode of the light-emitting diode LED14, and the positive electrode of the light-emitting diode LED19 are connected to the output end of the power supply, the cathode of the light-emitting diode LED12 is connected to the 83rd pin of the main control chip U4 through the resistor R65, the cathode of the light-emitting diode LED13 is connected to the 84th pin of the main control chip U4 through the resistor R66, the cathode of the light-emitting diode LED14 is connected to the 85th pin of the main control chip U4 through the resistor R67, and the cathode of the light-emitting diode LED9 is connected to the 85th pin of the main control chip U4 through the resistor R55 is connected to pin 62 of the main control chip U4; the LCD display circuit is provided with an LCD display interface FPC2, a resistor R3, a resistor R45, a resistor R46, a resistor R47 and a resistor R48, wherein the LCD display interface FPC2 has 32 pins, and pins 5, 6, 11, 12, 13, 14, 15 and 28 of the LCD display interface FPC2 are connected to the output end of the power supply, the 2nd pin of the LCD display interface FPC2 is connected to pin 86 of the main control chip U4 through resistor R48, the 3rd pin of the LCD display interface FPC2 is connected to pin 87 of the main control chip U4 through resistor R47, the 4th pin of the LCD display interface FPC2 is connected to pin 88 of the main control chip U4 through resistor R3, the 7th pin of the LCD display interface FPC2 is connected to pin 89 of the main control chip U4 through resistor R45, and the 8th pin of the LCD display interface FPC2 is connected to pin 90 of the main control chip U4 through resistor R46. In this embodiment, the LCD display circuit is used to display the relevant parameters transmitted by the main control circuit of the electric actuator, and the LED light prompt circuit is used to display various statuses. The label LED1 is connected to the 83rd pin of the main control chip U4 to control the red light to turn on or off; the label LED2 is connected to the 84th pin of the main control chip U4 to control the green light to turn on and off; the label LED3 is connected to the 85th pin of the main control chip U4 to control the yellow light to turn on and off; the label DR_RLED is connected to the 62nd pin of the main control chip U4 to control the orange light to turn on and off. LED9 is the power indicator light and will light up when there is 3.3V power.

[0041] like Figure 13The power-off reset circuit is connected with the input end of the main control circuit of the electric actuator, and is provided with a power-off reset interface FPC5 with 9 pins, wherein the 5th pin of the power-off reset interface FPC5 is connected with the output end of the power supply, and the 2nd, 3rd, 4th, 6th and 7th pins of the power-off reset interface FPC5 are connected with the 40th, 41st, 42nd, 43rd and 44th pins of the main control chip U4 respectively.

[0042] It can be seen from the above that the utility model provides a kind of control circuit of digital intelligent electric actuator, by being provided with mutually coordinated power supply, external connection line board circuit, electric actuator main control circuit, motor drive filter circuit, data encryption storage circuit, analog signal communication circuit, encoder signal input circuit, infrared signal receiving circuit, 485 communication circuit and button input circuit in the control circuit of digital intelligent electric actuator, electric actuator main control circuit can control motor drive filter circuit drive motor operation of electric actuator according to signal transmission of analog signal communication circuit, signal transmission of encoder signal input circuit, signal transmission of infrared signal receiving circuit, signal transmission of 485 communication circuit, information input of button input circuit, can realize high precision, high stability control of electric actuator, digital intelligent electric actuator has discarded traditional analog signal quantization control mode, has adopted brand-new digital signal control technology, can convert the position control requirement of electric actuator into accurate motor rotation number, and by controlling motor rotation speed to reach the mechanical characteristic when valve switch, the error deviation caused by the rotational inertia of controlled valve is greatly reduced;Brand-new digital signal control technology is adopted to improve the control precision of electric actuator to fluid, such as greatly improving furnace temperature control precision in burner industry, saving fuel;Improve the intelligent diagnostic ability of electric actuator, electric actuator can detect signal condition, mechanical failure, operating parameter etc.

[0043] The specific implementation methods described above are preferred implementation methods of the present invention, and are not intended to limit the specific implementation scope of the present invention. The scope of the present invention includes but is not limited to the specific implementation methods. All equivalent changes made in accordance with the present invention are within the protection scope of the present invention.

Claims

1. A control circuit for a digital intelligent electric actuator, characterized in that: It includes a power supply, an external connecting line board circuit, an electric actuator main control circuit, a motor drive filter circuit, a data encryption storage circuit, an analog signal communication circuit, an encoder signal input circuit, an infrared signal receiving circuit, a 485 communication circuit and a key input circuit. The output end of the power supply is connected to the external connecting line board circuit, the electric actuator main control circuit, the motor drive filter circuit, the data encryption storage circuit, the encoder signal input circuit, the infrared signal receiving circuit, the 485 communication circuit and the key input circuit for power supply. The output end of the electric actuator main control circuit is connected to the input end of the external connecting line board circuit, the input end of the motor drive filter circuit and the input end of the data encryption storage circuit. The output end of the connecting wire board circuit can be connected to an external wiring board, the output end of the motor drive filter circuit can be connected to the motor of the electric actuator, and the input end of the electric actuator main control circuit is connected to the output end of the analog signal communication circuit, the output end of the encoder signal input circuit, the output end of the infrared signal receiving circuit, the output end of the 485 communication circuit, and the output end of the key input circuit. The electric actuator main control circuit can control the motor drive filter circuit to drive the operation of the electric actuator motor according to the signal transmitted by the analog signal communication circuit, the signal transmitted by the encoder signal input circuit, the signal transmitted by the infrared signal receiving circuit, the signal transmitted by the 485 communication circuit, and the information entered by the key input circuit.

2. The control circuit of the digital intelligent electric actuator according to claim 1, characterized in that: The main control circuit of the electric actuator is provided with a main control chip U4, and the main control chip U4 is provided with 100 pins. The 6th, 11th, 23rd, 28th, 50th, 75th and 100th pins of the main control chip U4 are connected to the output end of the power supply, the 78th, 80th, 77th, 58th, 59th, 60th, 61st, 62nd, 63rd, 64th, 65th, 66th, 67th and 71st pins of the main control chip U4 are connected to the input end of the external connecting line board circuit, the 70th pin of the main control chip U4 is connected to the input end of the motor drive filter circuit, the 51st, 52nd, 53rd and 54th pins of the main control chip U4 are connected to the input end of the motor drive filter circuit, and the 51st, 52nd and 54th pins of the main control chip U4 are connected to the input end of the motor drive filter circuit. Pins 53, 54, 55, and 56 are connected to the input end of the data encryption storage circuit, pins 2, 3, and 4 of the main control chip U4 are connected to the output end of the key input circuit, pins 91, 92, and 93 of the main control chip U4 are connected to the output end of the encoder signal input circuit, pin 79 of the main control chip U4 is connected to the output end of the analog signal communication circuit, pin 82 of the main control chip U4 is connected to the output end of the infrared signal receiving circuit, and pins 46, 68, and 69 of the main control chip U4 are connected to the output end of the 485 communication circuit.

3. The control circuit of the digital intelligent electric actuator according to claim 2, characterized in that: The data encryption storage circuit is provided with an encryption storage chip U1, a transistor Q6, a transistor Q5, a transistor Q1, a resistor R75, a capacitor C14, a resistor R76, a capacitor C30, a resistor R29, a resistor R31 and a resistor R37, wherein the encryption storage chip U1 is provided with 8 pins, the 1st pin of the encryption storage chip U1 is connected to the collector of the transistor Q6, the base of the transistor Q6 is connected to the 52nd pin of the main control chip U4 through the resistor R29, the 3rd pin of the encryption storage chip U1 is connected to one end of the resistor R75 and one end of the capacitor C14, the other end of the resistor R75 is connected to the 51st pin of the main control chip U4, the 4th pin of the encryption storage chip U1 is connected to the base of the transistor Q1 through the resistor R37, the collector of the transistor Q1 is connected to the main The 53rd pin of the control chip U4 is connected, the 5th pin of the encryption storage chip U1 is connected to the collector of the transistor Q5, the base of the transistor Q5 is connected to the 54th pin of the main control chip U4 through the resistor R31, the 6th pin of the encryption storage chip U1 is connected to the 55th pin of the main control chip U4, the 7th pin of the encryption storage chip U1 is connected to one end of the resistor R76, the other end of the resistor R76 is connected to one end of the capacitor C30 and the 56th pin of the main control chip U4, the 8th pin of the encryption storage chip U1 is connected to the output end of the power supply, the 2nd pin of the encryption storage chip U1, the emitter of the transistor Q6, the emitter of the transistor Q5, the emitter of the transistor Q1, the other end of the capacitor C14, and the other end of the capacitor C30 are grounded.

4. The control circuit of the digital intelligent electric actuator according to claim 3, characterized in that: The external connecting line board circuit is provided with an interface FPC3, which has 30 pins. Pins 6 and 7 of the interface FPC3 are connected to the input end of the 485 communication circuit, and pins 13, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, and 28 of the interface FPC3 are respectively connected to pins 78, 80, 77, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, and 71 of the main control chip U4. Pin 14 of the interface FPC3 is connected to the analog signal communication circuit. The input end of the interface FPC3 is connected to the input end of the motor drive filter circuit, and the 27th pin of the interface FPC3 is connected to the input end of the motor drive filter circuit; the motor drive filter circuit is provided with a transistor Q15, a resistor R4 and a resistor R60, wherein the collector of the transistor Q15 is connected to one end of the resistor R4 and the 27th pin of the interface FPC3, the other end of the resistor R4 is connected to the output end of the power supply, the base of the transistor Q15 is connected to one end of the resistor R60, the other end of the resistor R60 is connected to the 70th pin of the main control chip U4, and the emitter of the transistor Q15 is grounded.

5. The control circuit of the digital intelligent electric actuator according to claim 4, characterized in that: The encoder signal input circuit is provided with an encoder interface FPC4, an anti-surge chip TV1, a transistor Q3, a resistor R12, a transistor Q2, a resistor R23, a transistor Q4 and a resistor R28, wherein the encoder interface FPC4 is provided with 8 pins, the anti-surge chip TV1 is provided with 6 pins, the 1st pin of the encoder interface FPC4 is connected to the output end of the power supply, the 2nd pin of the encoder interface FPC4 is connected to the 6th pin of the anti-surge chip TV1 and one end of the resistor R28, the other end of the resistor R28 is connected to the base of the transistor Q4, the collector of the transistor Q4 is connected to the 93rd pin of the main control chip U4, and the 4th pin of the encoder interface FPC4 is connected to the The 4th pin of the surge protection chip TV1 is connected to one end of the resistor R23, the other end of the resistor R23 is connected to the base of the transistor Q2, the collector of the transistor Q2 is connected to the 92nd pin of the main control chip U4, the 6th pin of the encoder interface FPC4 is connected to the 3rd pin of the surge protection chip TV1 and one end of the resistor R12, the other end of the resistor R12 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the 91st pin of the main control chip U4, the 8th pin of the encoder interface FPC4, the 2nd pin of the surge protection chip TV1, the emitter of the transistor Q3, the emitter of the transistor Q2, and the emitter of the transistor Q4 are grounded.

6. The control circuit of the digital intelligent electric actuator according to claim 5, characterized in that: A resistor R68 and a capacitor C29 are provided in the analog signal communication circuit, wherein one end of the resistor R68 is connected to the 14th pin of the interface FPC3, the other end of the resistor R68 is connected to one end of the capacitor C29 and the 79th pin of the main control chip U4, and the other end of the capacitor C29 is grounded; a key input circuit is provided with a key SW1, a resistor R13, a key SW2, a resistor R14, a key SW3 and a resistor R15, wherein one end of the key SW1 is connected to one end of the resistor R13 and the 4th pin of the main control chip U4, one end of the key SW2 is connected to one end of the resistor R14 and the 3rd pin of the main control chip U4, one end of the key SW3 is connected to one end of the resistor R15 and the 2nd pin of the main control chip U4, the other end of the resistor R13, the other end of the resistor R14 and the other end of the resistor R15 are connected to the output end of the power supply, and the other end of the key SW1, the other end of the key SW2 and the other end of the key SW3 are grounded.

7. The control circuit of the digital intelligent electric actuator according to claim 6, characterized in that: The infrared signal receiving circuit is provided with an infrared signal receiving chip LED8 and a resistor R57, wherein the infrared signal receiving chip LED8 is provided with 4 pins, the 4th pin of the infrared signal receiving chip LED8 is connected to the output end of the power supply through the resistor R57, and the 3rd pin of the infrared signal receiving chip LED8 is connected to the 82nd pin of the main control chip U4; the 485 communication circuit is provided with a 485 communication chip U8, and the 485 communication chip U8 is provided with 8 pins, the 1st, 2nd and 4th pins of the 485 communication chip U8 are respectively connected to the 69th, 46th and 68th pins of the main control chip U4, and the 6th and 7th pins of the 485 communication chip U8 are respectively connected to the 7th and 6th pins of the interface FPC3.

8. The control circuit of the digital intelligent electric actuator according to claim 7, characterized in that: The electric actuator main control circuit further includes an LED light prompt circuit and an LCD display circuit. The input end of the LED light prompt circuit and the input end of the LCD display circuit are connected to the output end of the main control circuit of the electric actuator. The LED light prompt circuit is provided with a light-emitting diode LED12, a resistor R65, a light-emitting diode LED13, a resistor R66, a light-emitting diode LED14, a resistor R67, a light-emitting diode LED9 and a resistor R55. The positive pole of the light-emitting diode LED12, the positive pole of the light-emitting diode LED13, the positive pole of the light-emitting diode LED14 and the positive pole of the light-emitting diode LED19 are connected to the output end of the power supply. The cathode of the light-emitting diode LED12 is connected to the 83rd pin of the main control chip U4 through the resistor R65. The cathode of the light-emitting diode LED13 is connected to the 84th pin of the main control chip U4 through the resistor R66. The cathode of the light-emitting diode LED14 is connected to the 85th pin of the main control chip U4 through the resistor R67. The cathode of the light-emitting diode LED9 is connected to the 86th pin of the main control chip U4 through the resistor R68. 55 is connected to the 62nd pin of the main control chip U4; the LCD display circuit is provided with an LCD display interface FPC2, a resistor R3, a resistor R45, a resistor R46, a resistor R47 and a resistor R48, wherein the LCD display interface FPC2 has 32 pins, the 5th, 6th, 11th, 12th, 13th, 14th, 15th and 28th pins of the LCD display interface FPC2 are connected to the output end of the power supply, the 2nd pin of the LCD display interface FPC2 is connected to the 1st pin of the main control chip U4 through the resistor R48. The 86th pin of the LCD display interface FPC2 is connected to the 87th pin of the main control chip U4 through the resistor R47, the 4th pin of the LCD display interface FPC2 is connected to the 88th pin of the main control chip U4 through the resistor R3, the 7th pin of the LCD display interface FPC2 is connected to the 89th pin of the main control chip U4 through the resistor R45, and the 8th pin of the LCD display interface FPC2 is connected to the 90th pin of the main control chip U4 through the resistor R46.

9. The control circuit of the digital intelligent electric actuator according to claim 8, characterized in that: It also includes a power-off reset circuit, the output end of the power-off reset circuit is connected to the input end of the main control circuit of the electric actuator, and a power-off reset interface FPC5 is provided in the power-off reset circuit. The power-off reset interface FPC5 has 9 pins, the 5th pin of the power-off reset interface FPC5 is connected to the output end of the power supply, and the 2nd, 3rd, 4th, 6th and 7th pins of the power-off reset interface FPC5 are respectively connected to the 40th, 41st, 42nd, 43rd and 44th pins of the main control chip U4.

10. The control circuit of the digital intelligent electric actuator according to claim 9, characterized in that: The model of the main control chip U4 is HK32F103VET6 or STM32F103VE or STM32F103VD or STM32F103VF or STM32F103VG or GD32F103VE or GD32F103VD or GD32F103VG or HK32F103VE or HK32F103VD, the model of the encryption storage chip U1 is THKU-001, the model of the infrared signal receiving chip LED8 is IRM-H936 / TR2, and the power supply is a 3.3V constant voltage power supply.

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