CN213629144U

CN213629144U - Power driving device of electric regulating valve

Info

Publication number: CN213629144U
Application number: CN202022261022.7U
Authority: CN
Inventors: 韩卫光; 周晓阳; 李博强; 王亚哲
Original assignee: Guangdong Core Juneng Semiconductor Co ltd
Current assignee: Guangdong Core Juneng Semiconductor Co ltd
Priority date: 2020-10-12
Filing date: 2020-10-12
Publication date: 2021-07-06
Anticipated expiration: 2030-10-12

Abstract

The application discloses power drive arrangement of electrical control valve, power drive arrangement includes motor, LVDT displacement sensor and power drive circuit. The power driving circuit comprises a control module, an IGBT driving module, an IGBT module and an LVDT conditioning module; the input end of the LVDT conditioning module is connected with the LVDT displacement sensor, and the output end of the LVDT conditioning module is connected with the control module. The input end of the IGBT driving module is connected with the control module, and the output end of the IGBT driving module is connected with the IGBT module; the input end of the IGBT module is connected with the IGBT driving module, and the output end of the IGBT module is connected with the motor. According to the method, the IGBT module is used for driving the motor to rotate, so that the delay in the on-off process of the AC contactor is avoided, and the control period is shortened; the opening degree of the valve is measured by the LVDT displacement sensor with frictionless measurement and high resolution, and the control precision is improved. This application extensively is applicable to the valve control field.

Description

Power driving device of electric regulating valve

Technical Field

The application relates to the field of valve control, in particular to a power driving device of an electric regulating valve.

Background

Electrically actuated valves are typically motorized and positioned for industrial control of parameters such as media flow, pressure or level. The electric control valve generally comprises an actuating component and a valve body, wherein in the related art, the actuating component comprises a motor, an alternating current contactor and a control circuit. The control circuit controls the on-off of the alternating current contactor by comparing the input valve control instruction with the current position of the valve, so that the motor is controlled to rotate, the aim of controlling the opening of the valve is fulfilled, the related technology depends on the control mode of the alternating current contactor, the regulation period is long, and the positioning is not accurate enough.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, the application provides a power driving device of an electric regulating valve, which utilizes an IGBT module to drive a motor to rotate, thereby controlling the opening of the valve and shortening the regulating period; and the opening degree of the valve is measured by using the LVDT displacement sensor, so that the control precision is higher.

Some embodiments of the present application provide a power driving apparatus for an electric control valve, including a motor, an LVDT displacement sensor, and a power driving circuit; the power driving circuit comprises a control module, an IGBT driving module, an IGBT module and an LVDT conditioning module; the input end of the LVDT conditioning module is connected with the LVDT displacement sensor, and the output end of the LVDT conditioning module is connected with the control module; the input end of the IGBT driving module is connected with the control module, and the output end of the IGBT driving module is connected with the IGBT module; the input end of the IGBT module is connected with the IGBT driving module, and the output end of the IGBT module is connected with the motor.

In some embodiments, the power driving apparatus further includes an EPA field bus, one end of the EPA field bus is connected to the control module, and the other end of the EPA field bus is connected to the upper control system.

In some embodiments, the power driving apparatus further includes a switching value and analog quantity module, the switching value and analog quantity module is connected to the upper control system through a first port, and the switching value and analog quantity module is connected to the control module through a second port.

In some embodiments, the power driving apparatus further includes a rectifying module, an input terminal of the rectifying module is connected to the power supply, and an output terminal of the rectifying module is connected to the input terminal of the IGBT module.

In some embodiments, the power driving circuit further comprises a sampling module, an input end of the sampling module is connected with the IGBT module, and an output end of the sampling module is connected with the control module.

In some embodiments, the power driving circuit further comprises a monitoring and alarming module, an input end of the monitoring and alarming module is connected with the sampling module, and an output end of the monitoring and alarming module is connected with the control module.

In some embodiments, the power driving apparatus further comprises a display and a control keyboard, wherein an input end of the display is connected with the control module, and an output end of the control keyboard is connected with the control module.

In some embodiments, the IGBT module is mounted in a first orientation of the motor junction box.

In some embodiments, the control module is mounted in a second orientation on the motor junction box top cover.

The embodiment of the application has the following beneficial effects: and measuring the current opening of the valve by using the LVDT displacement sensor, sending a displacement signal to the LVDT conditioning module, and converting the displacement signal into a voltage signal by the LVDT conditioning module. The control module obtains control parameters required by the valve to reach the specified opening degree through calculation, and outputs PWM signals to the IGBT driving module according to the control parameters, and the IGBT driving module controls the IGBT module to invert direct current into three-phase sine waves with adjustable frequency and amplitude for driving the motor to rotate, so that the opening degree of the valve is controlled, the delay of the alternating current contactor during on-off is avoided, and the control period is shortened; the opening degree of the valve is measured by the LVDT displacement sensor with frictionless measurement and high resolution, and the control precision is improved.

Additional aspects and advantages of embodiments of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The accompanying drawings are included to provide a further understanding of the claimed subject matter and are incorporated in and constitute a part of this specification, illustrate embodiments of the subject matter and together with the description serve to explain the principles of the subject matter and not to limit the subject matter.

FIG. 1 is a block diagram of an electric control valve power drive provided in accordance with certain embodiments of the present application;

FIG. 2 is a block diagram of an electric control valve power drive according to another embodiment of the present application;

fig. 3 is a schematic diagram of a partial structure of a power driving apparatus of an electric control valve according to another embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

It should be noted that although functional block divisions are provided in the system drawings and logical orders are shown in the flowcharts, in some cases, the steps shown and described may be performed in different orders than the block divisions in the systems or in the flowcharts. The terms first, second and the like in the description and in the claims, and the drawings described above, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

The embodiments of the present application will be further explained with reference to the drawings.

Some embodiments of the present application provide an electric regulator valve power drive 100.

Referring to fig. 1, fig. 1 is a block diagram of a power driving apparatus 100 of an electric control valve according to some embodiments of the present application, where the power driving apparatus 100 includes a motor 130, an LVDT displacement sensor 110, and a power driving circuit 120; power driver circuit 120 includes a control module 150, an IGBT driver module 160, an IGBT module 170, and an LVDT conditioning module 140; the input end of the LVDT conditioning module 140 is connected with the LVDT displacement sensor 110, and the output end of the LVDT conditioning module 140 is connected with the control module 150; the input end of the IGBT driving module 160 is connected with the control module 150, and the output end of the IGBT driving module 160 is connected with the IGBT module 170; the input end of the IGBT module 170 is connected to the IGBT driving module 160, and the output end of the IGBT module 170 is connected to the motor 130.

Specifically, when the electric control valve needs to be driven, the LVDT displacement sensor 110 detects the current opening of the valve, and sends a displacement signal to the LVDT conditioning module 140, and the LVDT conditioning module 140 converts the displacement signal into a voltage signal. The control module 150 obtains control parameters required by the valve to reach the specified opening degree through calculation, outputs a PWM signal to the IGBT drive module 160 according to the control parameters, and the IGBT drive module 160 controls the IGBT module 170 to invert direct current into three-phase sine waves with adjustable frequency and amplitude for driving the motor 130 to rotate, so that the opening degree of the valve is controlled. When the valve reaches the specified opening, the control module 150 sends the in-place information to the upper control system 200. The IGBT module 170 is used for driving the motor 130 to rotate, so that the delay of the on-off of the AC contactor is avoided, and the control period is shortened; the opening degree of the valve is measured by the LVDT displacement sensor 110 with no friction measurement and high resolution, and the control precision is improved. In addition, the structure of the LVDT displacement sensor 110 is relatively strong, which helps to improve the anti-vibration capability of the power driving apparatus 100 in the embodiment of the present application.

In some embodiments, the IGBT module 170 consists of 6 IGBT transistors, which can drive the ac asynchronous machine 130.

In some embodiments, the LVDT conditioning module 140 uses an AD698 signal conditioning chip for converting the displacement signal to a voltage signal.

In some embodiments, the control module 150 may receive the valve control command through a bus, or wirelessly, such as bluetooth or WiFi.

Referring to fig. 2, fig. 2 is a block diagram of an electric control valve power driving apparatus 100 according to another embodiment of the present application, where the power driving apparatus 100 further includes an EPA fieldbus 210, one end of the EPA fieldbus 210 is connected to the control module 150, and the other end of the EPA fieldbus 210 is connected to the upper control system 200.

Specifically, the MAC of the control module 150 is connected to the network driver through the MII interface, and then connected to the EPA fieldbus 210 through the network transformer. The upper control system 200 issues a valve opening setting instruction to the control module 150 through the EPA fieldbus 210, the EPA fieldbus 210 has the advantages of high-speed communication, high-precision synchronization and high reliability, and the valve opening setting instruction issued through the EPA fieldbus 210 makes a given value more stable and accurate, and is beneficial to realizing fine control of the valve opening compared with more accurate valve opening information fed back by the LVDT displacement sensor 110.

In some embodiments, referring to fig. 2, the power driving apparatus 100 further includes a switching value and analog quantity module 220, the switching value and analog quantity module 220 is connected to the upper control system 200 through a first port, and the switching value and analog quantity module 220 is connected to the control module 150 through a second port.

Specifically, since the EPA fieldbus 210 is used to perform communication according to the EPA bus standard, when the system of the user does not support the EPA bus standard, the valve opening is controlled by inputting an analog quantity, and a current of 4 to 20mA is generally used to set and receive the valve opening. Through the first port of the switching value and analog value module 220 on the power driving device 100, the upper control system 200 inputs an analog value for controlling the opening of the valve, such as setting the valve to be 75% open, and the switching value controls the opening and closing of the valve, and sends the analog value and the switching value to the control module 150 through the second port of the switching value and analog value module 220 on the power driving device 100. The opening information of the valve is input by using the setting switching value and analog quantity module, so that the power driving device 100 of the electric regulating valve in the embodiment of the application is suitable for richer working scenes.

In some embodiments, referring to fig. 2, the power driving apparatus 100 further includes a rectifying module 240, an input terminal of the rectifying module 240 is connected to the power supply 230, and an output terminal of the rectifying module 240 is connected to an input terminal of the IGBT module 170.

Specifically, the power supply 230 supplies three-phase alternating current to the rectifying module 240, and the rectifying circuit converts the three-phase alternating current into direct current and supplies the direct current to the IGBT module 170.

In some embodiments, referring to fig. 2, the power driving circuit 120 further includes a sampling module 250, an input of the sampling module 250 is connected to the IGBT module 170, and an output of the sampling module 250 is connected to the control module 150.

Specifically, the sampling module 250 collects the state information of each module in the power driving circuit 120, including current and voltage, and sends the collected module state information to the control module 150, and inputs the module state information from the ADC input interface of the control module 150.

In some embodiments, referring to fig. 2, power driver circuit 120 further includes a monitor and alarm module 260, an input of monitor and alarm module 260 coupled to sampling module 250, and an output of monitor and alarm module 260 coupled to control module 150.

Specifically, the sampling module 250 collects the state information of each module in the power driving circuit 120, including current and voltage, and sends the collected module state information to the control module 150 and the monitoring and alarming module 260. The monitoring and alarming module 260 is composed of a CPLD and a comparator, and monitors possible faults including overcurrent, overvoltage, undervoltage, and overheating of the IGBT module 170 in the power driving circuit 120 by the module state information sent by the sampling module 250, and when the monitoring and alarming module 260 monitors the fault condition in the power driving circuit 120, the fault condition is sent to the control module 150, and the control module 150 gives an alarm and protects the circuit.

In some embodiments, the output terminal of the monitoring and alarming module 260 may be further connected to the IGBT driving module 160, and when the monitoring and alarming module 260 monitors a fault condition in the power driving circuit 120, the output of the IGBT driving module 160 is directly disabled, so as to speed up the circuit protection.

In some embodiments, referring to fig. 2, the power driving apparatus 100 further includes a display 270 and a control keypad 280, an input of the display 270 is connected to the control module 150, and an output of the control keypad 280 is connected to the control module 150.

Specifically, the input end of the display 270 is connected to the control module 150, and when the power driving apparatus 100 is in the operating state, the display 270 displays the valve setting position and the current position of the valve; when the power driving apparatus 100 is in the debugging state, the display 270 displays the limit signal, the state information of each module sent by the sampling module 250 and the monitoring and alarming module 260, and the alarm information; when the power driving apparatus 100 is in the parameter setting state, the display 270 displays the control gain, the integration time, and the differentiation time.

The control pad 280 includes four keys, a select key (MODE), an increase key (INC), a decrease key (DEC), and a confirm key (SET). The meaning of the selection key is: when the cursor of the display 270 is at the leftmost position, the cursor moves leftwards and enters an editing state; when the cursor is at the rightmost position, the cursor exits the editing state, and the original data is unchanged; when the cursor is at another location, the cursor is moved to the left and the next digit to be changed is selected. The meaning of the additional bond is: when the cursor of the display 270 is at the leftmost position, the next parameter is selected to be displayed; when the cursor is at other positions, the current digit is incremented. The meaning of the reduction bond is: when the cursor of the display 270 is at the rightmost position, a last parameter is selected to be displayed; when the cursor is at other positions, the current digit is decremented. The meaning of the confirmation key is: when the cursor of the display 270 is not at the leftmost position, the currently input data is written into the data memory.

In some embodiments of the present application, the display 270 is a dot matrix monochrome liquid crystal display 270, and the control pad 280 may be a wired or wireless pad separate from the display 270. Referring to fig. 3, fig. 3 is a schematic diagram of a partial structure of the electric control valve power driving apparatus 100 according to another embodiment of the present application, and the control keypad 280 may also be integrated with the display 270 on the top cover 310 of the motor junction box and protected by a film-covered panel.

In some embodiments, referring to fig. 3, the IGBT module 170 is mounted in a first orientation of the motor junction box 300. Specifically, the IGBT module 170 is mounted on a substrate of the motor junction box 300, and heat is dissipated using a chassis.

In some embodiments, referring to fig. 3, the control module 150 is mounted in a second orientation on the motor junction box top cover 310. Specifically, the control module 150 is mounted below the motor junction box top cover 310.

In some embodiments, the control module 150 uses an STM32F407 chip, and the STM32F407 chip has built-in DSP, AD converter, MAC, and PWM control logic circuits, which may satisfy the requirements of the control module 150 in the embodiments of the present application.

In some embodiments, the motor 130 is a squirrel cage asynchronous motor 130, which is lower in cost, and the squirrel cage asynchronous motor 130 has stronger overload resistance and higher reliability than the servo motor 130 used in the conventional electric control valve power driving device 100.

The electric control valve power driving device 100 provided by the embodiment of the application can be used for driving an electric control valve, the electric control valve is widely applied to working environments such as water plants and chemical plants which need to control medium flow, and the working process of a water purification system in the water plant is explained by combining a module composition diagram of the electric control valve power driving device 100 in fig. 2.

Specifically, in the water purification system, the electric regulating valve is a flow regulating valve and is arranged on a pipeline for adding disinfectant or medicament. The water supply amount of the water purification system is easily affected by season changes, and when the water supply amount changes, the amount of the disinfectant or the amount of the medicament used by the water purification system also changes correspondingly. When the water purification system needs to drive the electric control valve, the rectification module 240 converts the three-phase ac power transmitted by the power supply 230 into dc power and sends the dc power to the control module 150. The upper control system 200 sends a valve opening setting command to the control module 150 through the EPA fieldbus 210, and the command is input and modified by the control keyboard 280 and displayed by the display 270. When the upper control system 200 is not suitable for the EPA communication protocol, the switching value and analog value module 220 is used to send a valve opening setting instruction to the control module 150. The LVDT displacement sensor 110 detects the current opening of the valve and sends a displacement signal to the LVDT conditioning module 140, and the LVDT conditioning module 140 converts the displacement signal into a voltage signal. The control module 150 obtains control parameters required by the valve to reach the specified opening degree through calculation, outputs a PWM signal to the IGBT drive module 160 according to the control parameters, and the IGBT drive module 160 controls the IGBT module 170 to invert direct current into three-phase sine waves with adjustable frequency and amplitude for driving the motor 130 to rotate, so that the opening degree of the valve is controlled. In the working process of the power driving apparatus 100, the sampling module 250 collects the state information of each module, including current and voltage, according to a certain frequency, and sends the collected state information of each module to the control module 150 and the monitoring and alarming module 260. The monitoring and alarming module 260 monitors possible faults in the circuit, including overcurrent, overvoltage, undervoltage and overheating of the IGBT module 170, according to the state information of each module, when the monitoring and alarming module 260 monitors the fault condition in the power driving circuit 120, the fault condition is sent to the control module 150, the control module 150 alarms and protects the circuit, and directly prohibits the output of the IGBT driving module 160, so as to accelerate the speed of circuit protection. When the valve reaches the specified opening, the control module 150 sends the in-place information to the upper control system 200. The water purification system adds quantitative disinfectant or medicament to a designated area, such as a water purification tank, through a pipeline provided with an electric regulating valve, thereby completing water purification operation.

The electric control valve in the water purification system sends a valve opening setting instruction through the EPA field bus 210, the data transmission speed is high, the communication reliability is higher, and the fine control of the valve opening is facilitated. The power driving device 100 uses the IGBT module 170 to drive the motor 130 to rotate, so that the delay of the on-off of the ac contactor is avoided, and the control period is shortened; the LVDT displacement sensor 110 with frictionless measurement and high resolution is used for measuring the opening of the valve, so that the control precision is improved, the adding amount of the disinfectant or the medicament can be more accurately controlled by the water purification system, and a better water purification effect is achieved. In addition, the structure of the LVDT displacement sensor 110 is relatively firm, which is helpful to improve the anti-vibration capability of the power driving apparatus 100 in the embodiment of the present application, so that the electric control valve provided with the power driving apparatus 100 in the embodiment of the present application is more suitable for a water purification system requiring large-flow water supply and material supply. The monitoring and alarming module 260 is arranged to monitor abnormal conditions of the power driving device 100 during working, so that faults can be found and processed in time, and normal operation of the water purification system can be guaranteed.

The above-described embodiments of the apparatus are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, i.e. may be located in one place, or may also be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

The present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are included in the scope defined by the claims of the present application.

Claims

1. The power driving device of the electric regulating valve is characterized by comprising a motor, an LVDT displacement sensor and a power driving circuit;

the power driving circuit comprises a control module, an IGBT driving module, an IGBT module and an LVDT conditioning module;

the input end of the LVDT conditioning module is connected with the LVDT displacement sensor, and the output end of the LVDT conditioning module is connected with the control module;

the input end of the IGBT driving module is connected with the control module, and the output end of the IGBT driving module is connected with the IGBT module;

the input end of the IGBT module is connected with the IGBT driving module, and the output end of the IGBT module is connected with the motor.

2. The power driving apparatus according to claim 1, further comprising an EPA field bus, one end of the EPA field bus being connected to the control module, and the other end of the EPA field bus being connected to an upper control system.

3. The power driving device according to claim 2, further comprising a switching value and analog quantity module, wherein the switching value and analog quantity module is connected to the upper control system through a first port, and the switching value and analog quantity module is connected to the control module through a second port.

4. The power driving device according to any one of claims 1-3, further comprising a rectifying module, wherein an input terminal of the rectifying module is connected to a power supply, and an output terminal of the rectifying module is connected to an input terminal of the IGBT module.

5. The power driving device according to claim 1, wherein the power driving circuit further comprises a sampling module, an input end of the sampling module is connected with the IGBT module, and an output end of the sampling module is connected with the control module.

6. The power driving device according to claim 5, wherein the power driving circuit further comprises a monitoring and alarming module, an input end of the monitoring and alarming module is connected with the sampling module, and an output end of the monitoring and alarming module is connected with the control module.

7. The power driving apparatus according to any one of claims 1, 2, 5 and 6, further comprising a display and a control keyboard, wherein an input end of the display is connected with the control module, and an output end of the control keyboard is connected with the control module.

8. The power drive of claim 7, wherein the IGBT module is mounted in a first orientation of a motor junction box.

9. The power drive of claim 8, wherein the control module is mounted in a second orientation on the motor junction box top cover.