Electric actuator control circuit for valve body

Abstract

The utility model relates to the related technical field of electric actuator control, in particular to an electric actuator control circuit for a valve body, which comprises a circuit board and is characterized in that a dual-mode power supply module and a signal processing module are integrated on the upper surface of the circuit board, and the dual-mode power supply module and the signal processing module are integrated on the upper surface of the circuit board. A dynamic feedback module is integrated on the upper surface of the circuit board, and an expandable structure module is integrated on the upper surface of the circuit board. According to the electric actuator control circuit for the valve body, through the arrangement of the dual-mode power supply module, when the control circuit is used, the control circuit can stably work under various power supply conditions and can be easily matched with a low-voltage direct-current power supply or a high-voltage alternating-current power supply, and the phenomenon of equipment incompatibility caused by the power supply problem is reduced.

Description

Technical Field

[0001] This utility model relates to the technical field of electric actuator control, and in particular to a control circuit for an electric actuator for valve body. Background Technology

[0002] In the field of industrial automation control, control valves are key components for regulating parameters such as flow and pressure. The precise control of their electric actuators is crucial. Traditional electric actuator control circuits often have problems such as a narrow power supply range and a single type of control signal. Therefore, there is a special need for an electric actuator control circuit for valve bodies.

[0003] However, some existing electric actuator control circuits can only be adapted to specific AC or DC power supplies, which cannot meet the power supply requirements of different application scenarios. In terms of control signals, they can only receive single analog or switching signals, making it difficult to adapt to diverse control systems. Utility Model Content

[0004] The purpose of this utility model is to provide a control circuit for an electric actuator for a valve body, in order to solve the problems mentioned in the background art. Some existing electric actuator control circuits can only be adapted to specific AC or DC power supplies, which cannot meet the power supply requirements of different application scenarios. In terms of control signals, they can only receive single analog or switching signals, which makes it difficult to adapt to diverse control systems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a control circuit for an electric actuator for a valve body, comprising a circuit board, characterized in that: a dual-mode power supply module is integrated on the upper surface of the circuit board, a signal processing module is integrated on the upper surface of the circuit board, a dynamic feedback module is integrated on the upper surface of the circuit board, and an expandable structure module is integrated on the upper surface of the circuit board.

[0006] The dual-mode power module has two adapter specifications: 19-42VAC / DC and 100V-240VAC / DC.

[0007] The signal processing module can process control signals and feedback signals covering analog quantities 0-10V, 2-10V, 0-20mA, 4-20mA and switch quantities 1-2 (power on) and 1-3 (power off);

[0008] The output of the dynamic feedback module is connected to the actuator motor. The microcontroller outputs a PWM signal to control the speed and direction of the motor according to the received control signal. At the same time, the feedback potentiometer detects the rotation angle of the motor in real time and feeds it back to the control circuit to stop the motor from rotating.

[0009] Preferably, the dual-mode power module uses a power conversion chip with a wide input voltage range. The chip integrates rectification, filtering, and voltage regulation modules, and the circuit also includes filtering components such as capacitors and inductors.

[0010] Preferably, in the signal processing module, for analog signal processing, there is a filter circuit composed of resistors and capacitors and an amplification circuit composed of operational amplifiers, and the analog signal is converted into a digital signal through a microcontroller A / D converter.

[0011] Preferably, for processing switch signals, the signal processing module uses an optocoupler isolation chip to electrically isolate the external switch signals from the control circuit, and uses a level conversion circuit to convert the signals into level signals that the microcontroller can recognize.

[0012] Preferably, the dynamic feedback module microcontroller generates a PWM signal through an internal timer module. The PWM signal drives the actuator motor to operate through a power amplifier circuit, and the output voltage of the feedback potentiometer is connected to the ADC input pin of the microcontroller.

[0013] Preferably, when implementing four types of control circuits, the expandable structural module can achieve combinations of different power supplies and signal types by changing the parameter values ​​of some resistors and capacitors in the circuit or adjusting the program configuration of the microcontroller.

[0014] Preferably, when generating eight different product specifications, the expandable structural module designs PCBs with different shapes according to different application scenarios and installation requirements.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The electric actuator control circuit for valve body, through the setting of dual-mode power supply module, enables the control circuit to work stably under various power supply conditions. It can be easily adapted to both low-voltage DC power supply and high-voltage AC power supply, reducing the incompatibility of equipment caused by power supply problems.

[0017] 2. Through the signal processing module, multiple control signal types are supported during use. Combined with precise motor control and feedback mechanisms, accurate control of the electric actuator is achieved, which can meet the requirements of high-precision adjustment of the valve opening in industrial production, and improve the automation level and control accuracy of the production process.

[0018] 3. By simply combining and changing the PCB shape, products of various specifications can be generated, providing users with more choices, meeting the personalized needs of different application scenarios, and reducing users' procurement costs and equipment management difficulties. Attached Figure Description

[0019] Figure 1 This is a side view of the appearance structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the circuit board structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the working process of this utility model.

[0022] In the diagram: 1. Circuit board; 2. Dual-mode power supply module; 3. Signal processing module; 4. Dynamic feedback module; 5. Expandable structure module. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Please see Figure 1-3 This utility model provides a technical solution: a control circuit for an electric actuator for a valve body, including a circuit board 1, a dual-mode power module 2 integrated on the upper surface of the circuit board 1, a signal processing module 3 integrated on the upper surface of the circuit board 1, a dynamic feedback module 4 integrated on the upper surface of the circuit board 1, and an expandable structure module 5 integrated on the upper surface of the circuit board 1.

[0025] The dual-mode power module 2 has two adapter specifications: 19-42VAC / DC and 100V-240VAC / DC.

[0026] The signal processing module 3 can process control signals and feedback signals covering analog quantities 0-10V, 2-10V, 0-20mA, 4-20mA and digital quantities 1-2 (power on) and 1-3 (power off);

[0027] The output of the dynamic feedback module 4 is connected to the actuator motor. The microcontroller outputs a PWM signal to control the speed and direction of the motor according to the received control signal. At the same time, it uses a feedback potentiometer to detect the rotation angle of the motor in real time and feeds it back to the control circuit to stop the motor from rotating.

[0028] Furthermore, the dual-mode power module 2 employs a power conversion chip with a wide input voltage range. The chip integrates rectification, filtering, and voltage regulation modules, and also includes filtering components such as capacitors and inductors. With the dual-mode power module 2, when a 19-42VAC / DC or 100V-240VAC / DC power supply is connected, the power conversion chip automatically identifies the power type. If it is AC, the internal rectification module rectifies it to DC; if it is DC, it directly enters the subsequent processing. Then, based on the input voltage range, the chip uses its internal voltage regulation module to adjust circuit parameters to convert the voltage to a value suitable for the stable operation of the control circuit and actuator motor. The filtering circuit composed of capacitors and inductors filters out ripple and high-frequency noise in the voltage, ensuring the stability of the output power supply and preventing power fluctuations from interfering with the normal operation of other modules.

[0029] Furthermore, in signal processing module 3, for analog signal processing, there is a filter circuit composed of resistors and capacitors and an amplifier circuit composed of operational amplifiers. The microcontroller A / D converter converts the analog signal into a digital signal. According to the settings of signal processing module 3, when the analog signal (0-10V, 2-10V, 0-20mA, 4-20mA) is input, it first passes through the filter circuit composed of resistors and capacitors. This filter circuit uses the AC-passing and DC-blocking characteristics of capacitors and the voltage-dividing characteristics of resistors to block high-frequency noise signals, making the analog signal purer. Then, the signal enters the amplifier circuit composed of operational amplifiers. The operational amplifiers amplify the analog signal to a voltage value suitable for the input range of the A / D converter according to their input-output characteristics. According to successive approximation or other conversion algorithms, the analog signal is converted into a digital signal and transmitted to the microcontroller. The SPI bus synchronizes data transmission through clock signals to ensure accurate data transmission.

[0030] Furthermore, for the processing of switching signals, signal processing module 3 uses an optocoupler isolation chip to electrically isolate external switching signals from the control circuit, and converts the signals into level signals recognizable by the microcontroller through a level conversion circuit. Through the settings of signal processing module 3, when in use, external switching signals (1-2 energized to open / 1-3 energized to close) first pass through the optocoupler isolation chip. The LED inside the optocoupler isolation chip emits light when current flows through it, causing the phototransistor to conduct or cut off, thereby electrically isolating the external circuit from the control circuit and preventing external strong electrical interference and noise from entering the control circuit. The signal after optocoupler isolation is then converted into a high-level or low-level signal recognizable by the microcontroller through the level conversion circuit, for the microcontroller to perform logical judgment and processing.

[0031] Furthermore, the dynamic feedback module 4 microcontroller generates a PWM signal through its internal timer module. This PWM signal drives the actuator motor via a power amplifier circuit. The output voltage of the feedback potentiometer is connected to the microcontroller's ADC input pin. Through the settings of the dynamic feedback module 4, during operation, the microcontroller receives control signal data from the signal processing module 3 and generates a PWM signal using its internal timer module. The timer module determines the frequency and duty cycle of the PWM signal by setting the counting period and pulse width. After the PWM signal is output, it passes through a power amplifier circuit composed of power devices such as transistors or field-effect transistors to amplify the power of the PWM signal, providing sufficient power. The actuator motor is driven by current and voltage. During motor operation, the feedback potentiometer mounted on the motor output shaft rotates accordingly. Its resistance value changes according to the motor rotation angle, which in turn converts the angle signal into a voltage signal. This voltage signal is connected to the ADC input pin of the microcontroller. The ADC module inside the microcontroller converts the analog voltage signal into a digital quantity. The microcontroller continuously compares the feedback angle digital quantity with the angle required by the control signal through a preset control algorithm. When the difference between the two is less than a set threshold, the microcontroller stops outputting the PWM signal, and the motor loses the drive signal and stops rotating, thus achieving precise control of the motor rotation angle and ultimately ensuring that the opening of the regulating valve meets the expected requirements.

[0032] Furthermore, when implementing control circuits of four specifications, the expandable structural module 5 can achieve combinations of different power supplies and signal types by changing the parameter values ​​of some resistors and capacitors in the circuit or adjusting the program configuration of the microcontroller. Through the settings of the expandable structural module 5, when implementing control circuits of four specifications, the expandable structural module 5 can adjust the electrical characteristics of the circuit by changing the parameter values ​​of some resistors and capacitors in the circuit. Changing the resistance value can adjust the voltage division ratio of the signal, affecting the processing range of analog signals; changing the capacitance value can adjust the cutoff frequency of the filter circuit, optimizing the signal filtering effect. In addition, the microcontroller's internal register settings, interrupt handling methods, and control algorithm parameters can be modified by adjusting the program configuration of the microcontroller. For example, for different power supply specifications and control signal types, the microcontroller's PWM signal generation parameters and feedback signal processing methods can be adjusted, thereby achieving combinations of different power supplies and signal types to meet the needs of different users.

[0033] Furthermore, when generating eight product specifications, the expandable structural module 5 designs PCBs with different shapes according to different application scenarios and installation requirements. Through the setting of the expandable structural module 5, when generating eight product specifications, the expandable structural module 5 designs PCBs with different shapes according to different application scenarios and installation requirements. For installation environments with limited space, a compact PCB shape is designed, and the various modules are reasonably arranged to reduce the space occupied. For scenarios with high heat dissipation requirements, a PCB with heat dissipation holes and a large area of ​​copper foil is designed. The heat dissipation holes can increase air circulation and assist in heat dissipation, while the large area of ​​copper foil utilizes its good thermal conductivity to quickly dissipate heat, while ensuring that the electrical connection between various modules is not affected, so that the product can operate stably under different working conditions.

[0034] Working Principle: When a 19-42VAC / DC or 100V-240VAC / DC power supply is connected, the power conversion chip automatically identifies the power type. If it is AC power, the internal rectifier module rectifies it to DC; if it is DC, it directly enters the subsequent processing. Then, based on the input voltage range, the chip uses its internal voltage regulation module to adjust circuit parameters to convert the voltage to a suitable value for stable operation of the control circuit and actuator motor. The filter circuit composed of capacitors and inductors can filter out ripple and high-frequency noise in the voltage, ensuring the stability of the output power supply and preventing power fluctuations from interfering with the normal operation of other modules. After analog signals (0-10V, 2-10V, 0-20mA, 4-20mA) are input, they first pass through a resistor... A filter circuit composed of capacitors utilizes the AC-passing, DC-blocking characteristics of capacitors and the voltage-dividing characteristics of resistors to block high-frequency noise signals, making the analog signal cleaner. The signal then enters an amplification circuit composed of operational amplifiers. The operational amplifiers, based on their input-output characteristics, amplify the analog signal to a voltage value suitable for the input range of the A / D converter chip. A 12-bit A / D converter chip is selected, and it converts the analog signal into a digital signal according to successive approximation or other conversion algorithms. The converted digital signal is transmitted to the microcontroller via the SPI bus in a serial communication manner. The SPI bus synchronizes data transmission through a clock signal to ensure accurate data transmission. External switch signals, 1-2 for power-on and 1-3 for power-off, are connected... The signal first passes through an optocoupler isolation chip. The LED inside the chip illuminates when current flows, causing the phototransistor to conduct or cut off, thus electrically isolating the external circuit from the control circuit and preventing strong external interference and noise from entering the control circuit. The signal after optocoupler isolation then passes through a level conversion circuit, converting it into a high or low level signal that the microcontroller can recognize for logical judgment and processing. After receiving control signal data from signal processing module 3, the microcontroller uses its internal timer module to generate a PWM signal. The timer module determines the frequency and duty cycle of the PWM signal by setting the counting period and pulse width. After the PWM signal is output, it passes through a power amplifier circuit, which uses transistors or field-effect transistors. The actuator, composed of power devices such as transistors, amplifies the power of the PWM signal to provide sufficient current and voltage to drive the motor. During motor operation, a feedback potentiometer mounted on the motor output shaft rotates, and its resistance changes according to the motor's rotation angle, converting the angle signal into a voltage signal. This voltage signal is connected to the microcontroller's ADC input pin. The microcontroller's internal ADC module converts the analog voltage signal into a digital value. The microcontroller, through a preset control algorithm, continuously compares the feedback digital angle with the angle required by the control signal. When the difference is less than a set threshold, the microcontroller stops outputting the PWM signal, and the motor stops rotating due to the loss of drive signal, thus achieving precise control of the motor's rotation angle.Ultimately, to ensure the regulating valve opening meets the expected requirements, when producing eight product specifications, the expandable structural module 5 designs PCBs with different shapes according to different application scenarios and installation requirements. For installation environments with limited space, a compact PCB shape is designed, with reasonable layout of each module to reduce space occupation. For scenarios with high heat dissipation requirements, a PCB with heat dissipation holes and large-area copper foil is designed. The heat dissipation holes increase airflow and assist in heat dissipation, while the large-area copper foil utilizes its excellent thermal conductivity to quickly dissipate heat, while ensuring that the electrical connections between each module are not affected, enabling the product to operate stably under different working conditions.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A control circuit for an electric actuator for a valve body, comprising a circuit board (1), characterized in that: The upper surface of the circuit board (1) is integrated with a dual-mode power module (2), the upper surface of the circuit board (1) is integrated with a signal processing module (3), the upper surface of the circuit board (1) is integrated with a dynamic feedback module (4), and the upper surface of the circuit board (1) is integrated with an expandable structure module (5). The dual-mode power module (2) has two adapter specifications, namely 19-42VAC / DC and 100V-240VAC / DC; The signal processing module (3) can process control signals and feedback signals covering analog quantities 0-10V, 2-10V, 0-20mA, 4-20mA and switch quantities 1-2 energized and 1-3 energized and de-energized; The output of the dynamic feedback module (4) is connected to the actuator motor. The microcontroller outputs a PWM signal to control the speed and direction of the motor according to the received control signal. At the same time, the feedback potentiometer is used to detect the rotation angle of the motor in real time and feed it back to the control circuit to stop the motor from rotating.

2. The electric actuator control circuit for a valve body according to claim 1, characterized in that: The dual-mode power module (2) uses a power conversion chip with a wide input voltage range. The chip integrates rectification, filtering and voltage regulation modules, and also adds capacitor and inductor filtering components to the circuit.

3. The electric actuator control circuit for a valve body according to claim 1, characterized in that: In the signal processing module (3), for analog signal processing, there is a filter circuit composed of resistors and capacitors and an amplification circuit composed of operational amplifiers. The analog signal is converted into a digital signal through the microcontroller A / D conversion element.

4. The electric actuator control circuit for a valve body according to claim 1, characterized in that: The signal processing module (3) uses an optocoupler isolation chip to electrically isolate the external switch signal from the control circuit for switch signal processing, and converts the signal into a level signal that the microcontroller can recognize through a level conversion circuit.

5. The electric actuator control circuit for a valve body according to claim 1, characterized in that: The dynamic feedback module (4) microcontroller generates a PWM signal through its internal timer module. The PWM signal drives the actuator motor to run through the power amplifier circuit. The output voltage of the feedback potentiometer is connected to the ADC input pin of the microcontroller.

6. The electric actuator control circuit for a valve body according to claim 1, characterized in that: When implementing control circuits of four specifications, the expandable structural module (5) can achieve combinations of different power supplies and signal types by changing the parameter values ​​of some resistors and capacitors in the circuit or adjusting the program configuration of the microcontroller.

7. The electric actuator control circuit for a valve body according to claim 1, characterized in that: When generating eight types of products, the expandable structural module (5) designs PCBs with different shapes according to different application scenarios and installation requirements.

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