CN210626935U

CN210626935U - Valve position transducer

Info

Publication number: CN210626935U
Application number: CN201921808091.6U
Authority: CN
Inventors: 王洪运; 李铭
Original assignee: Hubei Hongcheng General Machinery Co ltd
Current assignee: Hubei Hongcheng General Machinery Co ltd
Priority date: 2019-10-25
Filing date: 2019-10-25
Publication date: 2020-05-26
Anticipated expiration: 2029-10-25

Abstract

The utility model discloses a valve position changer, including host system, angular transducer, double integral circuit module, voltage follow and AD feedback circuit module, voltage conversion current output circuit module, information feedback and direction control circuit module, system power management module, angular transducer is connected with the host system electricity, and host system is connected with information feedback and direction control circuit module, double integral circuit module electricity, and double integral circuit module is connected with voltage follow and AD feedback circuit module electricity, and voltage follow and AD feedback circuit module is connected with voltage conversion current output circuit module electricity. The method has the advantages of high precision, simple operation, low price, extremely high anti-interference capability and high linearity between system measurement and results.

Description

Valve position transducer

Technical Field

The utility model belongs to the valve equipment field especially relates to a valve position changer.

Background

The valve position transmitter in the valve converts the state of the valve opening degree into a direct current source signal to be output, so that the accurate position of the valve is controlled through an industrial control system, or the direct current source signal is directly used for indicating the opening degree. The current valve position transmitter mainly utilizes an analog circuit to measure and convert angles, so that the problems of low precision, poor linearity, insufficient anti-interference capability and the like generally exist. Meanwhile, the use and operation are complex, complex installation requirements are required, and the accuracy of the test result can be ensured only by accurate installation and positioning.

Disclosure of Invention

In order to overcome the weak point of above-mentioned prior art, the utility model provides a valve position changer, its precision is high, easy operation, low price, and existing very high interference killing feature has guaranteed the high linearity between system measurement and result again.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides a valve position changer, includes host system, inclination sensor, double integral circuit module, voltage follow and AD feedback circuit module, voltage conversion current output circuit module, information feedback and direction control circuit module, system power management module, inclination sensor is connected with the host system electricity, and host system is connected with information feedback and direction control circuit module, double integral circuit module electricity, and double integral circuit module is connected with voltage follow and AD feedback circuit module electricity, and voltage follow and AD feedback circuit module is connected with voltage conversion current output circuit module electricity.

In the above technical solution, the main control module includes an 8-bit main MCU and a peripheral element circuit.

In the above technical solution, the tilt sensor includes a gravity tilt sensor and a peripheral component circuit.

In the above technical solution, the double integration circuit module includes 2 resistors R5 and R11 and 2 capacitors C8 and C11, and is connected to the main control module through a line PIA1 to receive the output PWM signal.

In the above technical solution, the voltage following and AD feedback circuit module includes 2 operational amplifiers (U2A, U2B), a resistor R10 and a capacitor C3, and is connected to the double integration circuit module through a VPWM circuit to receive the output voltage signal.

In the above technical solution, the voltage-to-current conversion output circuit module includes 2 operational amplifiers (U6A, U6B), 1 triode Q1, 1 high-precision feedback resistor R6 and corresponding peripheral component circuits, is connected to the voltage following and AD feedback circuit module through the VOut line, and receives the output voltage signal.

In the above technical solution, the information feedback and direction control circuit module includes 1 light emitting diode D1, 1 resistor R1, and 1 diode D4, and the D1 and the R1 are connected to the main control module through a line T0 LED.

In the above technical solution, the system power management module includes 2 three-terminal regulator chips and peripheral component circuits, and the module converts 5-24V dc into 3.3V dc for each functional module of the system.

The utility model has the advantages that: the main measurement part adopts a digital circuit, so that the anti-interference capacity is extremely high, the high linearity between the measurement and the result of the system is ensured, the flexible setting of the forward and reverse result and the system range is realized, and the installation and the use are greatly facilitated; meanwhile, the system adopts a 2-level feedback mechanism adjusting mechanism, a 2-level closed-loop control structure is constructed, the output is ensured to have extremely high precision, and compared with the same type of products in the market, the system has the characteristics of high precision, simple operation and low price; the utility model discloses not only can be used for the switching state of valve to measure, can also be used to multiple industry, civilian scene that need measure the inclination position.

Drawings

Fig. 1 is a block diagram of the present invention.

Fig. 2 is a circuit structure diagram of the main control module in fig. 1.

Fig. 3 is a circuit configuration diagram of the tilt sensor of fig. 1.

Fig. 4 is a circuit structure diagram of the dual integrator circuit module of fig. 1.

Fig. 5 is a circuit diagram of the voltage follower and AD feedback circuit block shown in fig. 1.

Fig. 6 is a circuit structure diagram of the voltage-to-current output circuit module in fig. 1.

Fig. 7 is a circuit structure diagram of the information feedback and direction control circuit module in fig. 1.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1, the valve position transmitter comprises a main control module, a tilt angle sensor, a dual-integration circuit module, a voltage following and AD feedback circuit module, a voltage conversion current output circuit module, an information feedback and direction control circuit module and a system power management module, wherein the tilt angle sensor is electrically connected with the main control module, the main control module is electrically connected with the information feedback and direction control circuit module and the dual-integration circuit module, the dual-integration circuit module is electrically connected with the voltage following and AD feedback circuit module, and the voltage following and AD feedback circuit module is electrically connected with the voltage conversion current output circuit module. The transmitter is attached to the valve body, the angle is changed along with the opening of the valve, after the angle is changed, the current gravity inclination angle is judged, and the inclination angle is finally converted into a 4-20mA current signal through PWM, integral conversion, impedance conversion and current conversion to provide output for other industrial control systems. The main measurement modules of gravity inclination angle measurement, PWM output and the like are all digital circuits, have extremely high anti-interference capability and extremely high linear output, and in addition, a closed-loop control output structure is constructed through feedback, so that the high output precision is realized.

As shown in fig. 2, the main control module includes an 8-bit main MCU and peripheral device circuits. MCU can use 8 bit MCU chips such as STM8S003F, C8051F030, etc., preferably STM8S 003F. Wherein the capacitor C10 is used for power decoupling and the resistor R12 is enabled by the MCU. The device is mainly responsible for being connected with a 2-inclination angle sensor through SCL and SDA lines (I2C buses), reading a digital result of gravity inclination angle measurement of the device, converting the result into a 10-bit PWM control signal, and outputting the PWM result to other modules in 2 paths through lines T0LED and PIA 1.

As shown in fig. 3, the tilt sensor includes a gravity tilt sensor and a peripheral component circuit. The tilt sensor may use chips such as ADXL345 and MMA8452, preferably MMA 8452. Wherein C7 is used for power decoupling. The gravity inclination angle measuring module is mainly responsible for measuring the gravity inclination angle state of a sensor chip through gravity, expressing a measuring result in a 10-bit digital mode, and is connected with a main control module through an SCL (clock level indicator) line and an SDA (serial data interface) line (I2C bus), and the module measures whether an output signal is a correct output result through an AIN (auxiliary input/output) feedback line, so that feedback adjustment is performed on PWM (pulse-width modulation), a closed-loop feedback adjustment mechanism is constructed, and the output precision is ensured.

As shown in fig. 4, the dual integrator circuit module includes 2 resistors R5 and R11 and 2 capacitors C8 and C11, and is connected to the main control module through a line PIA1 to receive the output PWM signal. The module has 2 series-connected integrating circuits consisting of R5 and C8, R11 and C11, and can accurately convert digital PWM signals into voltage signals which are output to other modules through VPWM. Although the 2 series-connected integrating circuits can perform digital-to-analog conversion accurately, the output load capability is very poor.

As shown in fig. 5, the voltage follower and AD feedback circuit module includes 2 operational amplifiers (U2A, U2B), a resistor R10 and a capacitor C3, and is connected to the double-integration circuit module through a VPWM circuit to receive the output voltage signal. Because the load capacity of a voltage signal on a VPWM (virtual pulse width modulation) line is extremely poor, the module utilizes U2A to form a voltage follower with high input impedance and high output pushing capacity, and the voltage signal which is strictly matched with the input voltage is output to a VOut line while the high load capacity is ensured to be output; U2B constructs the voltage follower similarly, is used for protecting VOut output not disturbed, simultaneously through the integrator circuit of R10 and C13 with output voltage feedback to the master control module through circuit AIN, carry out AD measurement by the main MCU to realize feedback adjustment. The 2 operational amplifiers U2A and U2B of the module may use an operational amplifier array chip such as LM 358.

As shown in fig. 6, the voltage-to-current conversion output circuit module includes 2 operational amplifiers (U6A, U6B), 1 transistor Q1, 1 high-precision feedback resistor R6 and corresponding peripheral component circuits, is connected to the voltage follower and AD feedback circuit module through the VOut line, and receives the output voltage signal. The module converts current output by an output line Iout into a voltage difference through R6, and feeds the voltage difference back to an amplifying circuit constructed by U6A through a voltage follower constructed by U6B, so that the current between a C pole and an E pole on Q1 is automatically controlled, and linear control of input voltage and output current is realized.

As shown in fig. 7, the information feedback and direction control circuit module includes 1 LED D1, 1 resistor R1, and 1 diode D4, wherein D1 and R1 are connected to the main control module through a T0LED, and convert PWM representing gravity tilt angle state into light emitting brightness of D1, and feed back the light emitting brightness to the user, but since the LEDs are non-linear elements, the gravity tilt angle state can only be fed back roughly, D4 is connected to the main control module through IX0, and output to IXP0, and protect the IX0 port of the main control module, receive external control digital signals, and output gravity tilt angle results in different directions according to external control signals.

In the above technical solution, the system power management module includes 2 three-terminal regulator chips and peripheral component circuits, and the module converts 5-24V dc into 3.3V dc for each functional module of the system. Due to the fact that the core of the system is low voltage of 3.3V, the system has high anti-interference performance.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention.

Claims

1. The utility model provides a valve position changer, characterized by: including host system, tilt sensor, double integral circuit module, voltage follow and AD feedback circuit module, voltage conversion current output circuit module, information feedback and direction control circuit module, system power management module, tilt sensor is connected with the host system electricity, and host system is connected with information feedback and direction control circuit module, double integral circuit module electricity, and double integral circuit module is connected with voltage follow and AD feedback circuit module electricity, and voltage follow and AD feedback circuit module is connected with voltage conversion current output circuit module electricity.

2. The valve position transducer of claim 1, wherein: the main control module comprises an 8-bit main MCU and a peripheral element circuit.

3. The valve position transducer of claim 1, wherein: the tilt sensor comprises a gravity tilt sensor and a peripheral element circuit.

4. The valve position transducer of claim 1, wherein: the double-integration circuit module comprises 2 resistors R5 and R11 and 2 capacitors C8 and C11, is connected with the main control module through a line PIA1, and receives the PWM signal output by the main control module.

5. The valve position transducer of claim 1, wherein: the voltage following and AD feedback circuit module comprises 2 operational amplifiers, a resistor R10 and a capacitor C3, is connected with the double-integration circuit module through a VPWM circuit, and receives voltage signals output by the double-integration circuit module.

6. The valve position transducer of claim 1, wherein: the voltage conversion current output circuit module comprises 2 operational amplifiers, 1 triode Q1, 1 high-precision feedback resistor R6 and a corresponding peripheral element circuit, is connected with the voltage following and AD feedback circuit module through a VOut circuit, and receives a voltage signal output by the voltage following and AD feedback circuit module.

7. The valve position transducer of claim 1, wherein: the information feedback and direction control circuit module comprises 1 light emitting diode D1, 1 resistor R1 and 1 diode D4, and the D1 and the R1 are connected with the main control module through a line T0 LED.

8. The valve position transducer of claim 1, wherein: the system power management module comprises 2 three-terminal voltage stabilization chips and peripheral element circuits, and converts 5-24V direct current into 3.3V direct current for each functional module of the system.