Control circuit of digital intelligent electric actuator

Abstract

The invention 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 beneficial effects 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 invention relates to the technical field of circuits, and in particular to a control circuit of a digital intelligent electric actuator. Background Art

[0002] An electric actuator is a driving device that can provide linear or rotary motion. The electric actuator uses a certain driving energy source and works under the action of 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 baffles to achieve automatic control. The electric actuator has a very good anti-deviation ability, and the output thrust or torque is basically constant. It can 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, it must stay in place, which is something that pneumatic actuators cannot do. Pneumatic actuators must be protected by a set of combined protection systems.

[0003] Electric actuators are also called valve electric devices, electric actuators, etc. 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 disadvantage. Due to the rotational inertia of the controlled valve and the quantitative control of the analog signal, there will be a small error deviation between the actual rotation position of the controlled valve and the initial position of the next start and stop of the electric actuator. This has little effect in general production processes that do not require too much accuracy. However, in some production process control processes that require very precise control, this control method cannot meet people's use needs. For example, in order to more accurately control the degree of opening of the valve, so as to achieve precise control of the specific flow of the fluid, precise temperature control, precise pressure control, precise flow control, etc. The tiny error generated by the method of using analog signals to control three-phase asynchronous motors is still not accurate enough for people, and the user experience brought to users is not good enough. Summary of the invention

[0004] In order to solve the problems in the prior art, the present invention provides a control circuit of 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 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 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 typed by the key input circuit, so that the electric actuator can accept multiple signals for intelligent control, with high control accuracy and high reliability and stability. At the same time, similar frequency conversion control technology is realized through software algorithms to reduce the error deviation caused by the rotation inertia of the controlled valve and save electric energy, which greatly improves the user experience and solves the problem that the electric actuator in the prior art adopts analog signal quantization control mode, which will produce a small error deviation and is difficult to meet people's practical needs.

[0005] The present invention provides a control circuit of a digital intelligent electric actuator, comprising 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, wherein the output end of the power supply is connected to the external wiring 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 wiring 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 circuit is connected, 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 electric actuator main control circuit can control the motor drive filter circuit to drive the motor of the electric actuator to operate 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 present invention is further improved, the main control circuit of the electric actuator is provided with a main control chip U4, the main control chip U4 is provided with 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, 67th, 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 5th pin of the main control chip U4 is connected to the input end of the motor drive filter circuit, Pins 1, 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 present invention 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, wherein 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 The base of the encryption storage chip U1 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 present invention is further improved, the external connecting line board circuit is provided with an interface FPC3, 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, the 13th, 15th, 16th, 17th, 18th, 19th, 20th, 21st, 22nd, 23rd, 24th, 25th, 26th, 28th pins of the interface FPC3 are respectively connected to the 78th, 80th, 77th, 58th, 59th, 60th, 61st, 62nd, 63rd, 64th, 65th, 66th, 67th, 71st pins of the main control chip U4, the 14th pin of the interface FPC3 is connected to the analog signal The input end of the 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 present invention is further improved, the encoder signal input circuit is provided with an encoder interface FPC4, a surge protection 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 surge protection chip TV1 is provided with 6 pins, the first pin of the encoder interface FPC4 is connected to the output end of the power supply, the second pin of the encoder interface FPC4 is connected to the sixth pin of the surge protection 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 connected to the 93rd pin of the main control chip U4. The 4th pin 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 present invention 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 R 13 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 invention 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, 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 invention is further improved and further includes an LED light prompt circuit and an LCD display circuit, wherein 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, and 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, wherein 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 R67. The resistor R55 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 is provided with 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, 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 present invention 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 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 is provided with 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 present invention 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 as follows: a control circuit of a digital intelligent electric actuator is provided, and 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 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 that high-precision and high-stability control of the electric actuator can be achieved. The digital intelligent electric actuator disdains the traditional analog signal quantization control method and adopts a new digital signal control technology, which can control the electric The position control requirements of the actuator are converted into precise motor rotation circles, and the motor rotation speed is controlled to meet the mechanical characteristics of the valve when it is opened and closed, greatly reducing 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 intuitive and 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 a variety of 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 is 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 It is a principle block diagram of a control circuit of a digital intelligent electric actuator of the present invention;

[0018] Figure 2 A circuit diagram of a main control circuit of an electric actuator of the present invention;

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

[0020] Figure 4 A circuit diagram of an external connection line board circuit of the present invention;

[0021] Figure 5 A circuit diagram of a motor drive filter circuit of the present invention;

[0022] Figure 6 A circuit diagram of an encoder signal input circuit of the present invention;

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

[0024] Figure 8 A circuit diagram of a key input circuit of the present invention;

[0025] Fig. 9 A circuit diagram of an infrared signal receiving circuit of the present invention;

[0026] Fig.10 A circuit diagram of the 485 communication circuit of the present invention;

[0027] Fig.11 A circuit diagram of the LED light prompt circuit of the present invention;

[0028] Fig.12 A circuit diagram of an LCD display circuit of the present invention;

[0029] Fig.13 It is a circuit diagram of the power-off reset circuit of the present invention. DETAILED DESCRIPTION

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention; the terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of the present invention or the above-mentioned drawings are used to distinguish different objects, not to describe a specific order.

[0031] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0032] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings.

[0033] like Figure 1-Figure 13As shown, a control circuit of a digital intelligent electric actuator provided by the present invention comprises 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, the output end of the power supply is connected to the external wiring 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 wiring 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 wiring 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, and 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 realize high-precision and high-stability control of the electric actuator. The digital intelligent electric actuator despises 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 control the motor rotation speed to achieve the force required when the valve is opened and closed. The new digital signal control technology improves the control accuracy of the electric actuator on the fluid. For example, in the burner industry, it greatly improves the furnace temperature control accuracy and saves fuel. The intelligent diagnosis capability of the electric actuator is improved. The electric actuator can detect the signal conditions, mechanical failures, operating parameters, etc. on site, which are intuitive and 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 a variety of signal compatibility combinations, adapt to a wider environment, 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 is provided with 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, and 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. , 67, 71 pins are connected to the input end of the external connection 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, 54th, 55th, 56th pins of the main control chip U4 are connected to the input end of the data encryption storage circuit, the 2nd, 3rd, 4th pins of the main control chip U4 are connected to the output end of the key input circuit, the 91st, 92nd, 93rd pins of the main control chip U4 are connected to the output end of the encoder signal input circuit, the 79th pin of the main control chip U4 is connected to the output end of the analog signal communication circuit, the 82nd pin of the main control chip U4 is connected to the output end of the infrared signal receiving circuit, and the 46th, 68th, 69th pins of the main control chip U4 are connected to the output end 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 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.

[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, wherein the model of the encryption storage chip U1 is THKU-001, and 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 base of the transistor Q1 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. In this embodiment, the encryption storage chip U1 is a memory chip with a data encryption function, and the data encryption storage circuit is used to store important data for the main control circuit of the electric actuator to call.

[0036] like Figure 4 and Figure 5As shown, an interface FPC3 is provided in the external connection board circuit, and the interface FPC3 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, and 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 to the 58th pin of the main control chip U4, the relay control interface, which controls the on and off of the relay on the wiring board; the 18th pin of the interface FPC3 is connected to the 59th pin of the main control chip U4, the relay control interface, which controls the on and off of the relay on the wiring board; the 19th pin of the interface FPC3 is connected to the 60th pin of the main control chip U4, the relay control interface, which controls the on and off of the relay on the wiring board; the 20th pin of the interface FPC3 is connected to the 61st pin of the main control chip U4, the relay control interface, which controls the on and off of the relay on the wiring board; the 21st pin of the interface FPC3 is connected to the 62nd pin of the main control chip U4, the motor drive alarm prompt pin; the 22nd pin of the interface FPC3 is connected to the The 23rd pin of the interface FPC3 is connected to the 64th pin of the main control chip U4, and the motor drive current peak is configured as pin 1; the 24th pin of the interface FPC3 is connected to the 65th pin of the main control chip U4, and the motor drive current peak is configured as pin 2; the 25th pin of the interface FPC3 is connected to the 66th pin of the main control chip U4, and the motor drive current peak is configured as pin 3; the 26th pin of the interface FPC3 is connected to the 67th pin of the main control chip U4, and the motor drive current peak is configured as pin 4; the 27th pin of the interface FPC3 is connected to the emitter of the transistor Q15, and the motor drive PWM input pin; the 28th pin of the interface FPC3 is connected to the 71st pin of the main control chip U4, and the motor drive direction input pin.

[0037] like 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 is provided with 8 pins, the anti-surge chip TV1 is provided with 6 pins, the first pin of the encoder interface FPC4 is connected to the output end of the power supply, the second pin of the encoder interface FPC4 is connected to the sixth 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 signal 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 an up key, and its main function is that when the actuator is under local control, by pressing and holding the key, the actuator will move 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 a down key, and its main function is that when the actuator is under local control, by pressing and holding the key, the actuator will move 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, and its 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 Fig. 9 and Fig.10 As shown, the infrared signal receiving circuit is provided with an infrared signal receiving chip LED8 and a resistor R57, wherein the model of the infrared signal receiving chip LED8 is IRM-H936 / TR2, and 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. 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, and 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 Fig.11 and Fig.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. R55 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 is provided with 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 86th pin of the main control chip U4 through the resistor R48, the 3rd 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. 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 states. 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, and LED9 is the power indicator light, which will light up when there is 3.3V electricity.

[0041] like Fig.13As shown, 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, and 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. In this embodiment, the power-off reset circuit is used to realize that after the external power supply of the electric actuator is cut off, it automatically switches to battery power supply, and drives the electric actuator to close or open the valve.

[0042] As can be seen from the above, the present invention provides a control circuit of 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 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 realize 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 adjust the position of the electric actuator. The control requirements are converted into precise motor rotation circles, and the motor rotation speed is controlled to meet the mechanical characteristics of the valve when it is switched on and off, which greatly reduces the error deviation caused by the rotational inertia of the controlled valve; the new digital signal control technology is adopted 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 diagnosis capability of the electric actuator is improved. The electric actuator can detect the signal conditions, mechanical failures, operating parameters, etc. on site, which are intuitive and 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 a variety of signal compatibility combinations, adapt to a wider environment, greatly improve the user experience, and solve the problem that the electric actuator in the prior art uses analog signal quantization control method, which will produce small error deviations and is difficult to meet people's practical needs.

[0043] The specific implementation modes described above are preferred implementation modes 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 modes, and all equivalent changes made according to 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 motor of the electric actuator to operate 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 is characterized in that: A main control chip U4 is provided in the main control circuit of the electric actuator, 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, and 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. 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 is 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 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 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 is characterized in that: 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, and the 14th pin of the interface FPC3 is connected to the analog signal communication circuit. The input end of the interface FPC3 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.

5. The control circuit of the digital intelligent electric actuator according to claim 4 is 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, the 4th pin of the encoder interface FPC4 is connected to 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 is characterized in that: 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 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 is characterized in that: An infrared signal receiving chip LED8 and a resistor R57 are provided in the infrared signal receiving circuit, 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; a 485 communication chip U8 is provided in the 485 communication circuit, 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 is characterized in that: The electric actuator also includes an LED light prompt circuit and an LCD display circuit, wherein 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, and 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, wherein 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 86th pin of the main control chip U4 through the resistor R 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 is provided with 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, a power-off reset interface FPC5 is provided in the power-off reset circuit, the power-off reset interface FPC5 is provided with 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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