CN106197814B - A kind of resistance-strain type tension detection circuit based on doube bridge arm current stabilization - Google Patents
A kind of resistance-strain type tension detection circuit based on doube bridge arm current stabilization Download PDFInfo
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- CN106197814B CN106197814B CN201610813443.1A CN201610813443A CN106197814B CN 106197814 B CN106197814 B CN 106197814B CN 201610813443 A CN201610813443 A CN 201610813443A CN 106197814 B CN106197814 B CN 106197814B
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- G—PHYSICS
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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Abstract
本发明涉及一种基于双桥臂稳流的电阻应变式张力检测电路，本发明包括双桥臂稳流控制电路、力检测调理电路，具体包括左稳流运放、右稳流运放、仪表运放、反相运放、正稳压管、左输入电阻、左检测电阻、右输入电阻R8、右检测电阻、左稳流电感、右稳流电感、左上应变片、左下应变片、正滤波电阻、反相电阻、反馈电阻等，本发明利用电流驱动能力强的运放与高性能仪表运放相结合构成的双桥臂稳流的电阻应变式张力检测电路，不仅使H型结构应变传感桥臂中的各支路电流实现恒流控制，也最大程度地提高了信号调理电路的集成度，输出的张力信号信噪比高、稳定性好，该电路器件少、实时性强、体积小、成本低、可靠性高、通用性好、易产品化。
The invention relates to a resistance strain type tension detection circuit based on double bridge arm steady flow, the invention includes a double bridge arm steady flow control circuit, a force detection conditioning circuit, specifically including a left steady flow op amp, a right steady flow op amp, an instrument Operational amplifier, inverting operational amplifier, positive Zener tube, left input resistor, left detection resistor, right input resistor R8, right detection resistor, left steady current inductor, right steady current inductor, upper left strain gauge, lower left strain gauge, positive filter Resistors, anti-phase resistors, feedback resistors, etc., the present invention uses a combination of operational amplifiers with strong current driving capabilities and high-performance instrument operational amplifiers to form a resistance-strain tension detection circuit with double bridge arm steady flow, which not only makes the H-shaped structure strain transmission The current of each branch in the sensing bridge arm realizes constant current control, which also maximizes the integration of the signal conditioning circuit. The output tension signal has a high signal-to-noise ratio and good stability. Small size, low cost, high reliability, good versatility, and easy productization.
Description
技术领域technical field
本发明属于工业测控领域，涉及一种电路，特别涉及一种基于双桥臂稳流的电阻应变式张力检测电路，适用于采用电阻应变片桥式电路检测卷绕物张力以及各类受力的测控应用场合。The invention belongs to the field of industrial measurement and control, and relates to a circuit, in particular to a resistance strain type tension detection circuit based on a double bridge arm steady flow, which is suitable for detecting the tension of winding objects and various kinds of forces by using resistance strain gauge bridge circuits. Measurement and control applications.
背景技术Background technique
张力测控系统是带材、线材等各类卷绕物生产控制中的关键技术，特别是张力检测电路的性能是张力控制系统正常运行的前提。目前，在卷绕物张力检测方面的常用方案及其不足之处主要在于：(1)方案1：采用电-气结合式浮动辊位移检测法，由浮动辊及其前后邻辊、气缸、电位器或直线位移传感器等组成，被测的卷绕物经前后邻辊张开一定角度后跨绕在浮动辊上(向前输送)，由一定气压作用下的气缸支撑浮动辊，根据力学原理，由电位器或直线位移传感器检测浮动辊的位移可间接获取张力信号，该方法输出信号较平稳，但需电、气机构配合，结构复杂、体积大、造价高，实时性也有待提高。(2)方案2：基于差动变压器的检测法，主要由差动变压器、浮动式受力支撑板、弹簧等组成，可产品化，但线性度、重复性、一致性等不理想，调试与标定较难。(3)方案3：基于稳压供电的电阻应变片检测法，采用电阻应变片作为受力敏感元件，采用由稳压电源激励的H桥结构应变传感电路，其输出为差动信号，进而由运放为主的后续变送电路进行信号处理与变送，存在的主要问题在于稳压电源中客观存在的噪声以及线路压降等都将对检测结果产生严重干扰，信噪比低，此外，信号处理电路中的器件参数匹配、调试与标定等都较复杂。The tension measurement and control system is the key technology in the production control of various coils such as strips and wires, especially the performance of the tension detection circuit is the prerequisite for the normal operation of the tension control system. At present, the commonly used schemes and their shortcomings in the detection of winding material tension mainly lie in: (1) Scheme 1: Using the electric-pneumatic combination floating roller displacement detection method, the floating roller and its front and rear adjacent rollers, cylinder, electric potential Composed of sensors or linear displacement sensors, etc., the measured winding is straddled on the floating roller (transported forward) after the front and rear adjacent rollers are opened at a certain angle, and the floating roller is supported by a cylinder under a certain air pressure. According to the principle of mechanics, The tension signal can be obtained indirectly by detecting the displacement of the floating roller with a potentiometer or a linear displacement sensor. This method outputs a relatively stable signal, but requires the cooperation of electric and pneumatic mechanisms. The structure is complex, bulky, and expensive, and the real-time performance needs to be improved. (2) Scheme 2: The detection method based on the differential transformer is mainly composed of a differential transformer, a floating force-bearing support plate, a spring, etc., which can be commercialized, but the linearity, repeatability, and consistency are not ideal. Calibration is difficult. (3) Scheme 3: The resistance strain gauge detection method based on the regulated power supply uses the resistance strain gauge as the force sensitive element, adopts the H-bridge structure strain sensing circuit excited by the regulated power supply, and its output is a differential signal, and then The subsequent transmission circuit based on the operational amplifier performs signal processing and transmission. The main problem is that the objective noise in the regulated power supply and the line voltage drop will seriously interfere with the detection results, and the signal-to-noise ratio is low. In addition, , the device parameter matching, debugging and calibration in the signal processing circuit are more complicated.
发明内容Contents of the invention
本发明的目的是针对现有技术存在的不足，提出一种基于双桥臂稳流的电阻应变式张力检测电路。该电路采用具有大电流输出的运放对H型结构的两个应变传感桥臂电路进行独立的稳流控制，进而由高性能仪表运放进行高集成度信号调理的电路处理方案，在该发明电路中，各应变传感桥臂电路激励电流恒定，输出张力信号信噪比高、稳定性好，该电路器件少、易产品化。The object of the present invention is to propose a resistance strain type tension detection circuit based on double bridge arm steady current to solve the deficiencies in the prior art. The circuit adopts an op amp with large current output to independently control the steady current of the two strain sensing bridge arm circuits of the H-shaped structure, and then uses a high-performance instrument op amp to perform highly integrated signal conditioning circuit processing scheme. In the inventive circuit, the excitation current of each strain sensing bridge arm circuit is constant, the signal-to-noise ratio of the output tension signal is high, and the stability is good, and the circuit has few components and is easy to be commercialized.
本发明包括双桥臂稳流控制电路、力检测调理电路。The invention includes a double bridge arm steady current control circuit and a force detection conditioning circuit.
双桥臂稳流控制电路包括左稳流运放IC1、右稳流运放IC2、正稳压管DW1、负稳压管DW2、基准电位器RP1、正限流电阻R1、负限流电阻R2、左输入电阻R3、左正端电阻R4、左接地电阻R5、左负端电阻R6、左检测电阻R7、右输入电阻R8、右正端电阻R9、右接地电阻R10、右负端电阻R11、右检测电阻R12、正稳压电容C1、负稳压电容C2、左稳流电感L1、右稳流电感L2，正稳压管DW1的阴极与正稳压电容C1的一端、正限流电阻R1的一端、左输入电阻R3的一端、右输入电阻R8的一端连接，正稳压管DW1的阳极接地，正稳压电容C1的另一端接地，正限流电阻R1的另一端与电路正电源端VCC端连接，负稳压管DW1的阳极与负稳压电容C2的一端、负限流电阻R2的一端连接，负稳压管DW1的阴极接地，负稳压电容C2的另一端接地，负限流电阻R2的另一端与电路负电源端VSS端连接，左输入电阻R3的另一端与左稳流运放IC1的正输入端IN+端、左正端电阻R4的一端连接，左正端电阻R4的另一端与左检测电阻R7的一端、左稳流电感L1的一端连接，左稳流运放IC1的负输入端IN-端与左接地电阻R5的一端、左负端电阻R6的一端连接，左接地电阻R5的另一端接地，左稳流运放IC1的输出端OUT端与左负端电阻R6的另一端、左检测电阻R7的另一端连接，左稳流运放IC1的正电源端VCC端与电路正电源端VCC端连接，左稳流运放IC1的负电源端VSS端与电路负电源端VSS端连接，右输入电阻R8的另一端与右稳流运放IC2的正输入端IN+端、右正端电阻R9的一端连接，右正端电阻R9的另一端与右检测电阻R12的一端、右稳流电感L2的一端连接，右稳流运放IC2的负输入端IN-端与右接地电阻R10的一端、右负端电阻R11的一端连接，右接地电阻R10的另一端接地，右稳流运放IC2的输出端OUT端与右负端电阻R11的另一端、右检测电阻R12的另一端连接，右稳流运放IC2的正电源端VCC端与电路正电源端VCC端连接，右稳流运放IC2的负电源端VSS端与电路负电源端VSS端连接。The double-bridge steady current control circuit includes left steady current operational amplifier IC1, right steady current operational amplifier IC2, positive voltage regulator DW1, negative voltage regulator DW2, reference potentiometer RP1, positive current limiting resistor R1, negative current limiting resistor R2 , left input resistor R3, left positive terminal resistor R4, left grounding resistor R5, left negative terminal resistor R6, left detection resistor R7, right input resistor R8, right positive terminal resistor R9, right grounding resistor R10, right negative terminal resistor R11, Right detection resistor R12, positive voltage stabilizing capacitor C1, negative voltage stabilizing capacitor C2, left steady current inductor L1, right steady current inductor L2, cathode of positive voltage stabilizing tube DW1 and one end of positive voltage stabilizing capacitor C1, positive current limiting resistor R1 One end of the left input resistor R3 and one end of the right input resistor R8 are connected, the anode of the positive voltage regulator tube DW1 is grounded, the other end of the positive voltage regulator capacitor C1 is grounded, the other end of the positive current limiting resistor R1 is connected to the positive power supply end of the circuit Connect to the VCC terminal, the anode of the negative voltage regulator DW1 is connected to one end of the negative voltage regulator capacitor C2 and one end of the negative current limiting resistor R2, the cathode of the negative voltage regulator DW1 is grounded, the other end of the negative voltage regulator capacitor C2 is grounded, the negative limit The other end of the current resistor R2 is connected to the negative power supply terminal VSS of the circuit, the other end of the left input resistor R3 is connected to the positive input terminal IN+ of the left constant current operational amplifier IC1, and one end of the left positive terminal resistor R4, and the left positive terminal resistor R4 The other end of the IC is connected to one end of the left detection resistor R7 and one end of the left constant current inductor L1, and the negative input terminal IN- of the left constant current operational amplifier IC1 is connected to one end of the left grounding resistor R5 and one end of the left negative end resistor R6. The other end of the left grounding resistor R5 is grounded, the output terminal OUT of the left constant current operational amplifier IC1 is connected to the other end of the left negative terminal resistor R6 and the other end of the left detection resistor R7, and the positive power supply terminal VCC of the left constant current operational amplifier IC1 terminal is connected to the positive power supply terminal VCC of the circuit, the negative power supply terminal VSS terminal of the left constant current operational amplifier IC1 is connected to the negative power supply terminal VSS terminal of the circuit, and the other end of the right input resistor R8 is connected to the positive input terminal IN+ of the right constant current operational amplifier IC2 Terminal, one end of the right positive terminal resistor R9 is connected, the other end of the right positive terminal resistor R9 is connected to one end of the right detection resistor R12, and one end of the right constant current inductor L2, and the negative input terminal IN- of the right constant current operational amplifier IC2 is connected to One end of the right grounding resistor R10 and one end of the right negative terminal resistor R11 are connected, the other end of the right grounding resistor R10 is grounded, the output terminal OUT of the right constant current operational amplifier IC2 is connected to the other end of the right negative terminal resistor R11, and the right detection resistor R12 The other end of the right constant current operational amplifier IC2 is connected to the positive power supply terminal VCC terminal of the circuit positive power supply terminal VCC, and the negative power supply terminal VSS terminal of the right constant current operational amplifier IC2 is connected to the negative power supply terminal VSS terminal of the circuit.
力检测调理电路包括仪表运放IC3、反相运放IC4、增益电位器RP2、电阻应变片力传感器、正滤波电阻R13、负滤波电阻R14、反相电阻R15、反馈电阻R16、滤波电容C3、正电源电容C4、负电源电容C5，电阻应变片力传感器由左上应变片VR1、左下应变片VR2、右上应变片VR3、右下应变片VR4组成，左上应变片VR1的一端与左稳流电感L1的另一端连接，左上应变片VR1的另一端与左下应变片VR2的一端、负滤波电阻R14的一端连接，左下应变片VR2的另一端接地，右上应变片VR3的一端与右稳流电感L2的另一端连接，右上应变片VR3的另一端与右下应变片VR4的一端、正滤波电阻R13的一端连接，右下应变片VR4的另一端接地，正滤波电阻R13另一端与滤波电容C3一端、仪表运放IC3正输入端IN+端连接，负滤波电阻R14一端与滤波电容C3的另一端、仪表运放IC3负输入端IN-端连接，仪表运放IC3增益正端RG+端与增益电位器RP2一端连接，仪表运放IC3增益负端RG-端与增益电位器RP2的另一端及其中心端连接，仪表运放IC3正电源端VCC端与电路正电源端VCC端、正电源电容C4的正端连接，正电源电容C4的负端接地，仪表运放IC3的负电源端VSS端与电路负电源端VSS端、负电源电容C5的负端连接，负电源电容C5的正端接地，仪表运放IC3的输出端OUT端与反相电阻R15的一端、压力信号输出端Upre-out端连接，反相运放IC4的负输入端IN-端与反相电阻R15的另一端、反馈电阻R16的一端连接，反相运放IC4的正输入端IN+端接地，反相运放IC4的正电源端VCC端与电路正电源端VCC端连接，反相运放IC4的负电源端VSS端与电路负电源端VSS端连接，反相运放IC4的输出端OUT端与反馈电阻R16的另一端、拉力信号输出端Upul-out端连接。The force detection conditioning circuit includes instrument operational amplifier IC3, inverting operational amplifier IC4, gain potentiometer RP2, resistance strain gauge force sensor, positive filter resistor R13, negative filter resistor R14, inverting resistor R15, feedback resistor R16, filter capacitor C3, Positive power supply capacitor C4, negative power supply capacitor C5, the resistance strain gauge force sensor is composed of the upper left strain gauge VR1, the lower left strain gauge VR2, the upper right strain gauge VR3, and the lower right strain gauge VR4. One end of the upper left strain gauge VR1 is connected to the left steady current inductor L1 The other end of the upper left strain gauge VR1 is connected to one end of the lower left strain gauge VR2 and one end of the negative filter resistor R14, the other end of the lower left strain gauge VR2 is grounded, one end of the upper right strain gauge VR3 is connected to the right constant current inductor L2 The other end is connected, the other end of the upper right strain gauge VR3 is connected to one end of the lower right strain gauge VR4 and one end of the positive filter resistor R13, the other end of the lower right strain gauge VR4 is grounded, the other end of the positive filter resistor R13 is connected to one end of the filter capacitor C3, The instrument operational amplifier IC3 positive input terminal IN+ is connected, one end of the negative filter resistor R14 is connected to the other end of the filter capacitor C3, and the instrument operational amplifier IC3 negative input terminal IN- is connected, the instrument operational amplifier IC3 gain positive terminal RG+ terminal is connected to the gain potentiometer RP2 One end is connected, the gain negative terminal RG- of the instrument operational amplifier IC3 is connected to the other end of the gain potentiometer RP2 and its central terminal, the positive power supply terminal VCC terminal of the instrument operational amplifier IC3 is connected to the positive power supply terminal VCC terminal of the circuit, and the positive power supply capacitor C4 The negative terminal of the positive power supply capacitor C4 is connected to the ground, the negative power supply terminal VSS terminal of the instrument operational amplifier IC3 is connected to the negative power supply terminal VSS terminal of the circuit, and the negative terminal of the negative power supply capacitor C5, the positive terminal of the negative power supply capacitor C5 is grounded, and the instrument operation The output terminal OUT of amplifier IC3 is connected to one terminal of the inverting resistor R15 and the pressure signal output terminal U pre-out , and the negative input terminal IN- of the inverting operational amplifier IC4 is connected to the other terminal of the inverting resistor R15 and the feedback resistor R16 The positive input terminal IN+ of the inverting operational amplifier IC4 is grounded, the positive power supply terminal VCC terminal of the inverting operational amplifier IC4 is connected to the positive power supply terminal VCC terminal of the circuit, and the negative power supply terminal VSS terminal of the inverting operational amplifier IC4 is connected to the circuit The negative power supply terminal VSS is connected, and the output terminal OUT of the inverting operational amplifier IC4 is connected to the other terminal of the feedback resistor R16 and the pull signal output terminal U pul-out .
本发明的有益效果如下：The beneficial effects of the present invention are as follows:
本发明利用电流驱动能力强的运放与高性能仪表运放相结合构成的双桥臂稳流的电阻应变式张力检测电路，不仅使H型结构应变传感桥臂中的各支路电流实现恒流控制，也最大程度地提高了信号调理电路的集成度，输出的张力信号信噪比高、稳定性好，该电路器件少、实时性强、体积小、成本低、可靠性高、通用性好、易产品化。The present invention utilizes the operational amplifier with strong current driving capability and the high-performance instrument operational amplifier to form a double bridge arm steady current resistance strain type tension detection circuit, which not only realizes the current of each branch in the strain sensing bridge arm of H-type The constant current control also maximizes the integration of the signal conditioning circuit. The output tension signal has a high signal-to-noise ratio and good stability. The circuit has fewer components, strong real-time performance, small size, low cost, high reliability, and universal Good performance and easy productization.
附图说明Description of drawings
图1为本发明的电路图。Fig. 1 is the circuit diagram of the present invention.
具体实施方式Detailed ways
下面结合附图对本发明作进一步说明。The present invention will be further described below in conjunction with accompanying drawing.
如图1所示，一种基于双桥臂稳流的电阻应变式张力检测电路，包括双桥臂稳流控制电路、力检测调理电路。As shown in Figure 1, a resistance strain type tension detection circuit based on double bridge arm steady flow includes a double bridge arm steady flow control circuit and a force detection conditioning circuit.
双桥臂稳流控制电路包括左稳流运放IC1、右稳流运放IC2、正稳压管DW1、负稳压管DW2、基准电位器RP1、正限流电阻R1、负限流电阻R2、左输入电阻R3、左正端电阻R4、左接地电阻R5、左负端电阻R6、左检测电阻R7、右输入电阻R8、右正端电阻R9、右接地电阻R10、右负端电阻R11、右检测电阻R12、正稳压电容C1、负稳压电容C2、左稳流电感L1、右稳流电感L2，正稳压管DW1的阴极与正稳压电容C1的一端、正限流电阻R1的一端、左输入电阻R3的一端、右输入电阻R8的一端连接，正稳压管DW1的阳极接地，正稳压电容C1的另一端接地，正限流电阻R1的另一端与电路正电源端VCC端连接，负稳压管DW1的阳极与负稳压电容C2的一端、负限流电阻R2的一端连接，负稳压管DW1的阴极接地，负稳压电容C2的另一端接地，负限流电阻R2的另一端与电路负电源端VSS端连接，左输入电阻R3的另一端与左稳流运放IC1的正输入端IN+端、左正端电阻R4的一端连接，左正端电阻R4的另一端与左检测电阻R7的一端、左稳流电感L1的一端连接，左稳流运放IC1的负输入端IN-端与左接地电阻R5的一端、左负端电阻R6的一端连接，左接地电阻R5的另一端接地，左稳流运放IC1的输出端OUT端与左负端电阻R6的另一端、左检测电阻R7的另一端连接，左稳流运放IC1的正电源端VCC端与电路正电源端VCC端连接，左稳流运放IC1的负电源端VSS端与电路负电源端VSS端连接，右输入电阻R8的另一端与右稳流运放IC2的正输入端IN+端、右正端电阻R9的一端连接，右正端电阻R9的另一端与右检测电阻R12的一端、右稳流电感L2的一端连接，右稳流运放IC2的负输入端IN-端与右接地电阻R10的一端、右负端电阻R11的一端连接，右接地电阻R10的另一端接地，右稳流运放IC2的输出端OUT端与右负端电阻R11的另一端、右检测电阻R12的另一端连接，右稳流运放IC2的正电源端VCC端与电路正电源端VCC端连接，右稳流运放IC2的负电源端VSS端与电路负电源端VSS端连接。The double-bridge steady current control circuit includes left steady current operational amplifier IC1, right steady current operational amplifier IC2, positive voltage regulator DW1, negative voltage regulator DW2, reference potentiometer RP1, positive current limiting resistor R1, negative current limiting resistor R2 , left input resistor R3, left positive terminal resistor R4, left grounding resistor R5, left negative terminal resistor R6, left detection resistor R7, right input resistor R8, right positive terminal resistor R9, right grounding resistor R10, right negative terminal resistor R11, Right detection resistor R12, positive voltage stabilizing capacitor C1, negative voltage stabilizing capacitor C2, left steady current inductor L1, right steady current inductor L2, cathode of positive voltage stabilizing tube DW1 and one end of positive voltage stabilizing capacitor C1, positive current limiting resistor R1 One end of the left input resistor R3 and one end of the right input resistor R8 are connected, the anode of the positive voltage regulator tube DW1 is grounded, the other end of the positive voltage regulator capacitor C1 is grounded, the other end of the positive current limiting resistor R1 is connected to the positive power supply end of the circuit Connect to the VCC terminal, the anode of the negative voltage regulator DW1 is connected to one end of the negative voltage regulator capacitor C2 and one end of the negative current limiting resistor R2, the cathode of the negative voltage regulator DW1 is grounded, the other end of the negative voltage regulator capacitor C2 is grounded, the negative limit The other end of the current resistor R2 is connected to the negative power supply terminal VSS of the circuit, the other end of the left input resistor R3 is connected to the positive input terminal IN+ of the left constant current operational amplifier IC1, and one end of the left positive terminal resistor R4, and the left positive terminal resistor R4 The other end of the IC is connected to one end of the left detection resistor R7 and one end of the left constant current inductor L1, and the negative input terminal IN- of the left constant current operational amplifier IC1 is connected to one end of the left grounding resistor R5 and one end of the left negative end resistor R6. The other end of the left grounding resistor R5 is grounded, the output terminal OUT of the left constant current operational amplifier IC1 is connected to the other end of the left negative terminal resistor R6 and the other end of the left detection resistor R7, and the positive power supply terminal VCC of the left constant current operational amplifier IC1 terminal is connected to the positive power supply terminal VCC of the circuit, the negative power supply terminal VSS terminal of the left constant current operational amplifier IC1 is connected to the negative power supply terminal VSS terminal of the circuit, and the other end of the right input resistor R8 is connected to the positive input terminal IN+ of the right constant current operational amplifier IC2 Terminal, one end of the right positive terminal resistor R9 is connected, the other end of the right positive terminal resistor R9 is connected to one end of the right detection resistor R12, and one end of the right constant current inductor L2, and the negative input terminal IN- of the right constant current operational amplifier IC2 is connected to One end of the right grounding resistor R10 and one end of the right negative terminal resistor R11 are connected, the other end of the right grounding resistor R10 is grounded, the output terminal OUT of the right constant current operational amplifier IC2 is connected to the other end of the right negative terminal resistor R11, and the right detection resistor R12 The other end of the right constant current operational amplifier IC2 is connected to the positive power supply terminal VCC terminal of the circuit positive power supply terminal VCC, and the negative power supply terminal VSS terminal of the right constant current operational amplifier IC2 is connected to the negative power supply terminal VSS terminal of the circuit.
力检测调理电路包括仪表运放IC3、反相运放IC4、增益电位器RP2、电阻应变片力传感器、正滤波电阻R13、负滤波电阻R14、反相电阻R15、反馈电阻R16、滤波电容C3、正电源电容C4、负电源电容C5，电阻应变片力传感器由左上应变片VR1、左下应变片VR2、右上应变片VR3、右下应变片VR4组成，左上应变片VR1的一端与左稳流电感L1的另一端连接，左上应变片VR1的另一端与左下应变片VR2的一端、负滤波电阻R14的一端连接，左下应变片VR2的另一端接地，右上应变片VR3的一端与右稳流电感L2的另一端连接，右上应变片VR3的另一端与右下应变片VR4的一端、正滤波电阻R13的一端连接，右下应变片VR4的另一端接地，正滤波电阻R13另一端与滤波电容C3一端、仪表运放IC3正输入端IN+端连接，负滤波电阻R14一端与滤波电容C3的另一端、仪表运放IC3负输入端IN-端连接，仪表运放IC3增益正端RG+端与增益电位器RP2一端连接，仪表运放IC3增益负端RG-端与增益电位器RP2的另一端及其中心端连接，仪表运放IC3正电源端VCC端与电路正电源端VCC端、正电源电容C4的正端连接，正电源电容C4的负端接地，仪表运放IC3的负电源端VSS端与电路负电源端VSS端、负电源电容C5的负端连接，负电源电容C5的正端接地，仪表运放IC3的输出端OUT端与反相电阻R15的一端、压力信号输出端Upre-out端连接，反相运放IC4的负输入端IN-端与反相电阻R15的另一端、反馈电阻R16的一端连接，反相运放IC4的正输入端IN+端接地，反相运放IC4的正电源端VCC端与电路正电源端VCC端连接，反相运放IC4的负电源端VSS端与电路负电源端VSS端连接，反相运放IC4的输出端OUT端与反馈电阻R16的另一端、拉力信号输出端Upul-out端连接。The force detection conditioning circuit includes instrument operational amplifier IC3, inverting operational amplifier IC4, gain potentiometer RP2, resistance strain gauge force sensor, positive filter resistor R13, negative filter resistor R14, inverting resistor R15, feedback resistor R16, filter capacitor C3, Positive power supply capacitor C4, negative power supply capacitor C5, the resistance strain gauge force sensor is composed of the upper left strain gauge VR1, the lower left strain gauge VR2, the upper right strain gauge VR3, and the lower right strain gauge VR4. One end of the upper left strain gauge VR1 is connected to the left steady current inductor L1 The other end of the upper left strain gauge VR1 is connected to one end of the lower left strain gauge VR2 and one end of the negative filter resistor R14, the other end of the lower left strain gauge VR2 is grounded, one end of the upper right strain gauge VR3 is connected to the right constant current inductor L2 The other end is connected, the other end of the upper right strain gauge VR3 is connected to one end of the lower right strain gauge VR4 and one end of the positive filter resistor R13, the other end of the lower right strain gauge VR4 is grounded, the other end of the positive filter resistor R13 is connected to one end of the filter capacitor C3, The instrument operational amplifier IC3 positive input terminal IN+ is connected, one end of the negative filter resistor R14 is connected to the other end of the filter capacitor C3, and the instrument operational amplifier IC3 negative input terminal IN- is connected, the instrument operational amplifier IC3 gain positive terminal RG+ terminal is connected to the gain potentiometer RP2 One end is connected, the gain negative terminal RG- of the instrument operational amplifier IC3 is connected to the other end of the gain potentiometer RP2 and its central terminal, the positive power supply terminal VCC terminal of the instrument operational amplifier IC3 is connected to the positive power supply terminal VCC terminal of the circuit, and the positive power supply capacitor C4 The negative terminal of the positive power supply capacitor C4 is connected to the ground, the negative power supply terminal VSS terminal of the instrument operational amplifier IC3 is connected to the negative power supply terminal VSS terminal of the circuit, and the negative terminal of the negative power supply capacitor C5, the positive terminal of the negative power supply capacitor C5 is grounded, and the instrument operation The output terminal OUT of amplifier IC3 is connected to one terminal of the inverting resistor R15 and the pressure signal output terminal U pre-out , and the negative input terminal IN- of the inverting operational amplifier IC4 is connected to the other terminal of the inverting resistor R15 and the feedback resistor R16 The positive input terminal IN+ of the inverting operational amplifier IC4 is grounded, the positive power supply terminal VCC terminal of the inverting operational amplifier IC4 is connected to the positive power supply terminal VCC terminal of the circuit, and the negative power supply terminal VSS terminal of the inverting operational amplifier IC4 is connected to the circuit The negative power supply terminal VSS is connected, and the output terminal OUT of the inverting operational amplifier IC4 is connected to the other terminal of the feedback resistor R16 and the pull signal output terminal U pul-out .
本发明所使用的包括左稳流运放IC1、右稳流运放IC2、仪表运放IC3、反相运放IC4、正稳压管DW1、负稳压管DW2、基准电位器RP1、增益电位器RP2、左上应变片VR1、左下应变片VR2、右上应变片VR3、右下应变片VR4等在内的所有器件均采用现有的成熟产品，可以通过市场取得。例如：上述稳流运放和反相运放都可采用TLE2064，稳压管采用AD589、基准电位器与增益电位器都可采用3296系列的精密多圈电位器，应变片采用BHF系列温度自补偿式电阻应变片等。Used in the present invention includes left steady current op amp IC1, right steady current op amp IC2, instrument op amp IC3, inverting op amp IC4, positive voltage regulator tube DW1, negative voltage regulator tube DW2, reference potentiometer RP1, gain potential All devices including the device RP2, upper left strain gauge VR1, lower left strain gauge VR2, upper right strain gauge VR3, and lower right strain gauge VR4 are existing mature products and can be obtained through the market. For example: TLE2064 can be used for the above-mentioned constant current operational amplifier and inverting operational amplifier, AD589 can be used for the voltage regulator tube, 3296 series precision multi-turn potentiometer can be used for the reference potentiometer and gain potentiometer, and BHF series temperature self-compensation can be used for the strain gauge resistance strain gauges, etc.
本发明中的主要电路参数整定原则如下：The main circuit parameter tuning principle among the present invention is as follows:
(1)设：稳压管DW1、DW2的稳压值均为Uw，电阻应变片力传感器的左桥臂电流为Is1，左输入电阻R3、左正端电阻R4、左接地电阻R5、左负端电阻R6、左检测电阻R7与Uw、Is1间的参数配合关系如式(1)、式(2)、式(3)、式(4)所示(1) Assume: the constant voltage values of the voltage regulator tubes DW1 and DW2 are both Uw, the current of the left bridge arm of the resistance strain gauge force sensor is Is1, the left input resistance R3, the left positive terminal resistance R4, the left grounding resistance R5, the left negative The parameter matching relationship between the terminal resistor R6, the left detection resistor R7 and Uw, Is1 is shown in formula (1), formula (2), formula (3) and formula (4)
R3＝R5 (1)R3=R5 (1)
R4＝R6 (2)R4=R6 (2)
Is1＝UwR4/(R3R7) (3)Is1=UwR4/(R3R7) (3)
R7<R4/1000 (4)R7<R4/1000 (4)
(2)设：电阻应变片力传感器的右桥臂电流为Is2，右输入电阻R8、右正端电阻R9、右接地电阻R10、右负端电阻R11、右检测电阻R12与Uw、Is2间的参数配合关系如式(5)、式(6)、式(7)、式(8)所示。(2) Suppose: the current of the right bridge arm of the resistance strain gauge force sensor is Is2, the right input resistance R8, the right positive terminal resistance R9, the right grounding resistance R10, the right negative terminal resistance R11, the right detection resistance R12 and Uw, Is2 The parameter matching relationship is shown in formula (5), formula (6), formula (7) and formula (8).
R8＝R10 (5)R8=R10 (5)
R9＝R11 (6)R9=R11 (6)
Is2＝UwR9/(R8R12) (7)Is2=UwR9/(R8R12) (7)
R12<R9/1000 (8)R12<R9/1000 (8)
(3)正滤波电阻R13、负滤波电阻R14间的参数配合关系如式(9)所示。(3) The parameter matching relationship between the positive filter resistor R13 and the negative filter resistor R14 is shown in formula (9).
R13＝R14 (9)R13＝R14 (9)
(4)反相电阻R15、反馈电阻R16间的参数配合关系如式(10)所示。(4) The parameter matching relationship between the inverting resistor R15 and the feedback resistor R16 is shown in formula (10).
R15＝R16 (10)R15＝R16 (10)
本发明工作过程如下：The working process of the present invention is as follows:
如图1所示，本发明图1中正稳压管DW1的电压UW作为电阻应变片力传感器中左、右桥臂应变传感电路电流的给定信号，经由以左稳流运放IC1、右稳流运放IC2、左检测电阻R7、右检测电阻R12、左稳流电感L1、右稳流电感L2等为主的左、右桥臂稳流控制电路后向电阻应变片力传感器的左、右桥臂支路提供低噪声的恒流电流Is1、Is2，分别如式(3)、式(7)所示。电阻应变片力传感器输出的差动传感信号Us+、Us-经仪表运放IC3、反相器IC4后分别输出压力信号Upre-out、拉力信号Upul-out，以供用户选用，发明电路中的基准电位器RP1、增益电位器RP2分别用零点迁移与增益调整。As shown in Figure 1, the voltage U W of the positive voltage regulator tube DW1 in Figure 1 of the present invention is used as the given signal of the current of the strain sensing circuit of the left and right bridge arms in the resistance strain gauge force sensor, via the left steady current operational amplifier IC1, Right steady current operational amplifier IC2, left detection resistor R7, right detection resistor R12, left steady current inductor L1, right steady current inductor L2 etc. left and right bridge arm steady current control circuits backward to the left of the resistance strain gauge force sensor , and the right bridge arm branch provide low-noise constant currents Is1 and Is2, as shown in equations (3) and (7) respectively. The differential sensing signals U s+ and U s- output by the resistance strain gauge force sensor respectively output the pressure signal U pre-out and the tension signal U pul-out after the instrument operational amplifier IC3 and the inverter IC4 for user selection. The reference potentiometer RP1 and the gain potentiometer RP2 in the inventive circuit are adjusted by zero shift and gain respectively.
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| CN111811723A (en) * | 2020-06-10 | 2020-10-23 | 杭州电子科技大学 | A signal processing circuit for multi-dimensional force sensor |
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