CN204154778U - A kind of active faint power current inductive coil - Google Patents
A kind of active faint power current inductive coil Download PDFInfo
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Abstract
本实用新型公开了一种有源微弱工频电流感应线圈，包括柔性感应线圈、取样及积分电路、有源差分放大电路和电压跟随器；其中，柔性感应线圈，用于将耦合到的磁场转换为交流电流信号并输出至取样及积分电路；取样及积分电路，用于对接收的交流电流信号进行取样，获得工频电压信号并输出至有源差分放大电路；有源差分放大电路，用于将接收的工频电压信号进行放大后输出至电压跟随器；电压跟随器，用于隔离、缓冲放大后的工频电压信号，输出电压信号。本实用新型采用非接触的方法，方便地检测电涌保护器件的工频漏电流，广泛地应用于防雷装置电涌保护器的工频漏电流的检测项目。
The utility model discloses an active weak power frequency current induction coil, which comprises a flexible induction coil, a sampling and integration circuit, an active differential amplifier circuit and a voltage follower; wherein the flexible induction coil is used for converting the magnetic field coupled to It is an AC current signal and output to the sampling and integration circuit; the sampling and integration circuit is used to sample the received AC current signal, obtain the power frequency voltage signal and output it to the active differential amplifier circuit; the active differential amplifier circuit is used for The received power frequency voltage signal is amplified and then output to the voltage follower; the voltage follower is used to isolate and buffer the amplified power frequency voltage signal and output the voltage signal. The utility model adopts a non-contact method to conveniently detect the power frequency leakage current of the surge protection device, and is widely used in the detection items of the power frequency leakage current of the surge protector of the lightning protection device.
Description
技术领域technical field
本实用新型涉及雷电科学与技术领域，特别是一种有源微弱工频电流感应线圈。The utility model relates to the field of lightning science and technology, in particular to an active weak power frequency current induction coil.
背景技术Background technique
雷电流是一种典型的瞬态电流脉冲，雷击发生在输电线路上常造成输电线路的开路、短路以及绝缘性能的变化等现象。根据建筑物防雷设计规范GB50057-2010的设计要求，在输电线路中安装电涌保护器用于释放和抑制雷电波的能量。电涌保护器在释放和抑制雷电波能量的同时，自身将雷电波的一定能量转换成热能，使其自身的性能发生劣变现象。劣变的出现常常表现为器件的开路、短路以及器件的工频漏电流变大。前两种现象比较容易检测，现象比较明显。但是，器件的工频漏电流变大现象不容易检测，都是它却会对输电线路造成一定的影响，由于漏电流大导致输电线漏电流保护装置跳闸，使输电线路不能正常工作。漏电流变大还会导致器件发热，引起火灾等事故。Lightning current is a typical transient current pulse. Lightning strikes on transmission lines often cause open circuits, short circuits, and changes in insulation performance of transmission lines. According to the design requirements of GB50057-2010 lightning protection design code for buildings, surge protectors are installed in the transmission lines to release and suppress the energy of lightning waves. While releasing and suppressing the lightning wave energy, the surge protector converts a certain energy of the lightning wave into heat energy by itself, causing its own performance to deteriorate. The appearance of deterioration is often manifested as open circuit, short circuit and power frequency leakage current of the device become larger. The first two phenomena are easier to detect, and the phenomenon is more obvious. However, it is not easy to detect the large power frequency leakage current of the device, but it will have a certain impact on the transmission line. Due to the large leakage current, the leakage current protection device of the transmission line will trip, so that the transmission line cannot work normally. The increased leakage current will also cause the device to heat up, causing fire and other accidents.
因此，根据建筑物防雷装置检测要求，应对安装在输电线路的电涌保护器件进行定期检测。目前，在检测的项目中，电涌保护器件的工频漏电流检测常用常规的方法将交流电流表串联在电涌保护器件线路中进行测量。但是，这种检测方法操作不方便，检测也不安全。Therefore, according to the testing requirements of building lightning protection devices, surge protection devices installed on transmission lines should be regularly tested. At present, in the detection project, the power frequency leakage current detection of the surge protection device is usually measured by connecting an AC ammeter in series with the surge protection device circuit. However, this detection method is inconvenient to operate and the detection is not safe.
如何克服现有技术的不足已成为现有雷电科学与技术领域亟待解决的重点难题。How to overcome the deficiencies of the existing technology has become a key problem to be solved urgently in the field of lightning science and technology.
发明内容Contents of the invention
本实用新型所要解决的技术问题是克服现有技术的不足而提供一种有源微弱工频电流感应线圈，本实用新型用于检测安装在输电线路中电涌保护器件的漏电流，实现对防雷装置中电涌保护器的定期性能检测。The technical problem to be solved by the utility model is to provide an active weak power frequency current induction coil by overcoming the deficiencies of the prior art. Periodic performance testing of surge protectors in lightning installations.
本实用新型为解决上述技术问题采用以下技术方案：The utility model adopts the following technical solutions for solving the above-mentioned technical problems:
根据本实用新型提出的一种有源微弱工频电流感应线圈，包括柔性感应线圈、取样及积分电路、有源差分放大电路和电压跟随器；其中，An active weak power frequency current induction coil proposed according to the utility model includes a flexible induction coil, a sampling and integration circuit, an active differential amplifier circuit and a voltage follower; wherein,
柔性感应线圈，用于将耦合到的磁场转换为交流电流信号并输出至取样及积分电路；The flexible induction coil is used to convert the coupled magnetic field into an AC current signal and output it to the sampling and integrating circuit;
取样及积分电路，用于对接收的交流电流信号进行取样，并获得工频电压信号输出至有源差分放大电路；The sampling and integrating circuit is used to sample the received AC current signal, and obtain the power frequency voltage signal to output to the active differential amplifier circuit;
有源差分放大电路，用于将接收的工频电压信号进行放大后输出至电压跟随器；The active differential amplifier circuit is used to amplify the received power frequency voltage signal and output it to the voltage follower;
电压跟随器，用于隔离、缓冲放大后的工频电压信号，输出电压信号。The voltage follower is used to isolate and buffer the amplified power frequency voltage signal and output the voltage signal.
作为本实用新型的一种有源微弱工频电流感应线圈进一步的优化方案，所述柔性感应线圈包括柔性骨架、穿插在柔性骨架中的铜柱和在柔性骨架上密绕两层的导线；柔性感应线圈有两个输出端：第一输出端和第二输出端。As a further optimization scheme of the active weak power frequency current induction coil of the present invention, the flexible induction coil includes a flexible frame, copper columns interspersed in the flexible frame, and two layers of wires tightly wound on the flexible frame; the flexible The induction coil has two output terminals: a first output terminal and a second output terminal.
作为本实用新型的一种有源微弱工频电流感应线圈进一步的优化方案，所述柔性骨架是绝缘硅橡胶管，所述导线为柔软的高温导线。As a further optimization scheme of the active weak power frequency current induction coil of the present invention, the flexible frame is an insulating silicon rubber tube, and the wire is a soft high-temperature wire.
作为本实用新型的一种有源微弱工频电流感应线圈进一步的优化方案，所述取样及积分电路包括第一电阻、第二电阻和电容；其中，As a further optimization scheme of the active weak power frequency current induction coil of the present invention, the sampling and integration circuit includes a first resistor, a second resistor and a capacitor; wherein,
第一电阻的一端与第二电阻的一端、第一输出端分别连接，第二电阻的另一端与电容的一端连接，第一电阻的另一端与第二输出端、电容的另一端分别连接。One end of the first resistor is connected to one end of the second resistor and the first output end respectively, the other end of the second resistor is connected to one end of the capacitor, and the other end of the first resistor is connected to the second output end and the other end of the capacitor respectively.
作为本实用新型的一种有源微弱工频电流感应线圈进一步的优化方案，所述有源差分放大电路包括第三至十电阻，电压跟随器包括第一电压跟随器、第二电压跟随器和第三电压跟随器；其中，As a further optimization scheme of an active weak power frequency current induction coil of the present invention, the active differential amplifier circuit includes the third to ten resistors, and the voltage follower includes a first voltage follower, a second voltage follower and The third voltage follower; wherein,
第三电阻的一端与电容的一端连接，第三电阻的另一端与第五电阻的一端、第一电压跟随器的负输入端分别连接，第一电压跟随器的正输入端接地，第一电压跟随器的输出端与第七电阻的一端连接，第七电阻的另一端与第九电阻的一端、第三电压跟随器的负输入端分别连接，第九电阻的另一端与第三电压跟随器的输出端连接；第四电阻的一端与电容的另一端连接，第四电阻的另一端与第六电阻的一端、第二电压跟随器的负输入端连接，第二电压跟随器的正输入端接地，第六电阻的另一端与第二电压跟随器的输出端、第八电阻的一端分别连接，第八电阻的另一端与第三电压跟随器的正输入端、第十电阻的一端分别连接，第十电阻的另一端接地。One end of the third resistor is connected to one end of the capacitor, the other end of the third resistor is respectively connected to one end of the fifth resistor and the negative input end of the first voltage follower, the positive input end of the first voltage follower is grounded, and the first voltage The output end of the follower is connected to one end of the seventh resistor, the other end of the seventh resistor is connected to one end of the ninth resistor, and the negative input end of the third voltage follower is respectively connected, and the other end of the ninth resistor is connected to the third voltage follower The output terminal of the fourth resistor is connected to the other end of the capacitor, the other end of the fourth resistor is connected to one end of the sixth resistor, the negative input terminal of the second voltage follower, and the positive input terminal of the second voltage follower Grounding, the other end of the sixth resistor is connected to the output end of the second voltage follower and one end of the eighth resistor respectively, and the other end of the eighth resistor is connected to the positive input end of the third voltage follower and one end of the tenth resistor respectively , the other end of the tenth resistor is grounded.
本实用新型采用以上技术方案与现有技术相比，具有以下技术效果：Compared with the prior art by adopting the above technical scheme, the utility model has the following technical effects:
(1)本实用新型的有源微弱工频电流感应线圈的测量范围大，测量工频电流从1μA～10mA，满足电涌保护器工频漏电流的检测要求；(1) The active weak power frequency current induction coil of the utility model has a large measurement range, and can measure the power frequency current from 1μA to 10mA, which meets the detection requirements of the power frequency leakage current of the surge protector;
(2)该感应线圈采用有源放大电路，检测灵敏度高，显示负载对测量精度的影响小；(2) The induction coil adopts an active amplifier circuit, which has high detection sensitivity, and the display load has little influence on the measurement accuracy;
(3)该感应的骨架采用柔性硅橡胶材料，具有防潮湿、防水、绝缘性能好，使用安全；(3) The skeleton of the sensor is made of flexible silicone rubber material, which is moisture-proof, waterproof, good insulation performance, and safe to use;
(4)该感应线圈测量时，与带电体之间是非接触的，操作方便，安全可靠；(4) When the induction coil is measured, it is non-contact with the charged body, easy to operate, safe and reliable;
(5)该感应线圈测量精度高，误差范围小，测量平均误差为±1.03％；(5) The induction coil has high measurement accuracy, small error range, and the average measurement error is ±1.03%;
(6)该感应线圈应用范围广泛，同样适用于感应绝缘端子工频漏电流的检测，该感应线圈应用范围广泛，同样适用于感应绝缘端子工频漏电流的检测，方便地检测电涌保护器件的工频漏电流，广泛地应用于防雷装置电涌保护器的工频漏电流的检测项目。。(6) The induction coil has a wide range of applications, and is also suitable for the detection of power frequency leakage current of inductive insulating terminals. The power frequency leakage current is widely used in the detection project of the power frequency leakage current of the lightning protection device surge protector. .
附图说明Description of drawings
图1是本实用新型的原理方框图。Fig. 1 is a schematic block diagram of the utility model.
图2是本实用新型中柔性感应线圈的结构图。Fig. 2 is a structural diagram of the flexible induction coil in the utility model.
图3是本实用新型中取样及积分电路图。Fig. 3 is a sampling and integration circuit diagram in the utility model.
图4是本实用新型中有源差分放大电路及电压跟随器电路图。Fig. 4 is a circuit diagram of an active differential amplifier circuit and a voltage follower in the utility model.
具体实施方式Detailed ways
下面结合附图对本实用新型的技术方案做进一步的详细说明：Below in conjunction with accompanying drawing, the technical scheme of the utility model is described in further detail:
如图1所示是本实用新型的原理方框图，根据本实用新型提出的一种有源微弱工频电流感应线圈，包括柔性感应线圈、取样及积分电路、有源差分放大电路和电压跟随器；其中，As shown in Figure 1 is the principle block diagram of the utility model, a kind of active weak power frequency current induction coil proposed according to the utility model, comprises flexible induction coil, sampling and integration circuit, active differential amplifier circuit and voltage follower; in,
柔性感应线圈，用于将耦合到的磁场转换为交流电流信号并输出至取样及积分电路；The flexible induction coil is used to convert the coupled magnetic field into an AC current signal and output it to the sampling and integrating circuit;
取样及积分电路，用于对接收的交流电流信号进行取样，获得工频电压信号并输出至有源差分放大电路；The sampling and integrating circuit is used to sample the received AC current signal, obtain the power frequency voltage signal and output it to the active differential amplifier circuit;
有源差分放大电路，用于将接收的工频电压信号进行放大后输出至电压跟随器，提高感应线圈的灵敏度；The active differential amplifier circuit is used to amplify the received power frequency voltage signal and output it to the voltage follower to improve the sensitivity of the induction coil;
电压跟随器，用于隔离、缓冲放大后的工频电压信号，输出电压信号，保证输出电压信号强度。The voltage follower is used to isolate and buffer the amplified power frequency voltage signal, output the voltage signal, and ensure the strength of the output voltage signal.
图2是本实用新型中柔性感应线圈的结构图，所述柔性感应线圈包括柔性骨架、穿插在柔性骨架中的铜柱和在柔性骨架上密绕两层的导线；柔性感应线圈有两个输出端：第一输出端和第二输出端。所述柔性骨架是绝缘硅橡胶管，所述导线为柔软的高温导线。Fig. 2 is the structural diagram of the flexible induction coil in the utility model, and described flexible induction coil comprises flexible framework, the copper column interspersed in the flexible framework and the wire that two layers are closely wound on the flexible framework; Flexible induction coil has two output Terminals: a first output terminal and a second output terminal. The flexible frame is an insulating silicon rubber tube, and the wire is a soft high-temperature wire.
柔性感应线圈的原理是利用导体上变化的电流会产生变化的磁场的原理。当磁场耦合到线圈上时，线圈就会感应出电信号。柔性感应线圈的骨架是内径为4mm，外径为8mm，长度为4cm的绝缘硅橡胶管，起支撑作用，并且该骨架具有柔软性，在其一端插入一支长2cm，直径为4mm的铜柱并插入橡胶管的另一端即可使橡胶管环绕成一个封闭的环路。骨架上感应线圈的绕制应比较密以提高线圈的感应系数。缠绕时先按照某一个方向密集缠绕，缠绕至骨架末端以后继续往反方向缠绕，并预留两个接线端(第一输出端和第二输出端)用于取样及积分电路连接，用于为后取样及积分电路提供感应信号。缠绕时所用的导线应该采用适当柔软的高温导线。感应线圈的绕阻材料和缠绕的方式是一个决定性的因素，绕制越密则线圈的感应系数越大，线圈自感和杂散电容越大，其上限频率会降低，这种绕制方式对工频电流的测量不会有较大的影响。根据柔性线圈的绕线特性，选取内径为0.5mm，外径为1mm的5芯高温导线，内导线具有优良的耐腐蚀性、耐酸性、耐碱性，绝缘层具有优良的电绝缘性能，能耐高压、耐高温，有较小的高频损耗。根据柔性线圈的参数要求，根据经验公式计算：The principle of the flexible induction coil is to use the principle that the changing current on the conductor will generate a changing magnetic field. When a magnetic field couples to the coil, the coil induces an electrical signal. The skeleton of the flexible induction coil is an insulating silicon rubber tube with an inner diameter of 4mm, an outer diameter of 8mm, and a length of 4cm. And insert the other end of the rubber tube to make the rubber tube circle into a closed loop. The winding of the induction coil on the skeleton should be denser to increase the inductance of the coil. When winding, first wind densely in a certain direction, and then continue to wind in the opposite direction after winding to the end of the skeleton, and reserve two terminals (the first output terminal and the second output terminal) for sampling and integrating circuit connections. A post-sampling and integrating circuit provides the sensing signal. The wire used for winding should be suitably soft high temperature wire. The winding material and winding method of the induction coil are a decisive factor. The denser the winding, the greater the inductance of the coil, the greater the self-inductance and stray capacitance of the coil, and the lower the upper limit frequency. The measurement of power frequency current will not have a big influence. According to the winding characteristics of the flexible coil, a 5-core high-temperature wire with an inner diameter of 0.5mm and an outer diameter of 1mm is selected. The inner wire has excellent corrosion resistance, acid resistance, and alkali resistance, and the insulating layer has excellent electrical insulation performance. High pressure, high temperature resistance, small high frequency loss. According to the parameter requirements of the flexible coil, it is calculated according to the empirical formula:
l＝2n(b-a+h+d)l=2n(b-a+h+d)
S1＝πd2/4S 1 = πd 2 /4
r＝ρl/S1；r=ρl/S 1 ;
Sc＝(h+d)(b-a+d)S c =(h+d)(b-a+d)
式中，a为硅橡胶管的内径，b为硅橡胶管的外径，h为绕制线圈的圈高，d为绕制导线的直径，S1是导线的截面积，Sc是线圈的截面积，ρ为铜材料的电阻率，l所需用到的导线长度，r是电阻；ρ＝17.5nΩ·m，a＝4mm，b＝8mm，h＝4.4mm。经计算绕制的匝数取460匝。绕制方式为密绕两层，每层230匝。线圈绕制完成后，在线圈的外围采用同样的硅橡胶管封装起来，硅橡胶管的内径为10mm，外径为14mm，长度为25cm。线圈的第一输出端1与第二输出端2是信号输出端口用于与第一电阻R1相接。In the formula, a is the inner diameter of the silicone rubber tube, b is the outer diameter of the silicone rubber tube, h is the coil height of the wound coil, d is the diameter of the wound wire, S 1 is the cross-sectional area of the wire, S c is the coil Cross-sectional area, ρ is the resistivity of the copper material, the length of the wire needed for l, r is the resistance; ρ=17.5nΩ·m, a=4mm, b=8mm, h=4.4mm. The calculated number of turns to be wound is 460 turns. The winding method is close winding two layers, 230 turns per layer. After the winding of the coil is completed, the same silicone rubber tube is used to encapsulate the outer circumference of the coil. The inner diameter of the silicone rubber tube is 10mm, the outer diameter is 14mm, and the length is 25cm. The first output terminal 1 and the second output terminal 2 of the coil are signal output ports for connecting with the first resistor R1.
图3是本实用新型中取样及积分电路图，所述取样及积分电路包括第一电阻R1、第二电阻R2和电容C；其中，第一电阻R1的一端与第二电阻R2的一端、第一输出端分别连接，第二电阻R2的另一端与电容C的一端连接，第一电阻R1的另一端与第二输出端、电容C的另一端分别连接。第一电阻R1、第二电阻R2和电容C这三者以π型布置。取样及积分电路的器件参数选取应根据柔性线圈的参数计算得出：第一电阻R1＝275Ω，其中R2＝100Ω，C＝8μF。端口3与端口4分别与柔性线圈端口的1端口和2端口连接，为取样及积分电路提供信号输入，端口5和端口6作为下一级有源差分放大电路及电压跟随器电路的信号输入端口，与有源差分放大电路及电压跟随器电路的端口7和端口8相连。取样及积分电路，用于对接收的交流电流信号进行取样得到工频电压信号，通过第一电阻R1即把柔性线圈耦合得到的电流信号转化为电压信号。取样电阻式取样电路里面的R1，利用积分电路实现输出至有源差分放大电路的电压信号与第一电阻R1上的电压信号成正比。Fig. 3 is a sampling and integration circuit diagram in the utility model, and the sampling and integration circuit includes a first resistor R1, a second resistor R2 and a capacitor C; wherein, one end of the first resistor R1 and one end of the second resistor R2, the first The output ends are respectively connected, the other end of the second resistor R2 is connected to one end of the capacitor C, and the other end of the first resistor R1 is connected to the second output end and the other end of the capacitor C respectively. The first resistor R1, the second resistor R2 and the capacitor C are arranged in a π-shape. The device parameter selection of the sampling and integrating circuit should be calculated according to the parameters of the flexible coil: the first resistance R1=275Ω, where R2=100Ω, C=8μF. Port 3 and port 4 are respectively connected to port 1 and port 2 of the flexible coil port to provide signal input for sampling and integration circuits, and port 5 and port 6 are used as signal input ports for the next-stage active differential amplifier circuit and voltage follower circuit , connected to port 7 and port 8 of the active differential amplifier circuit and the voltage follower circuit. The sampling and integrating circuit is used to sample the received AC current signal to obtain a power frequency voltage signal, and convert the current signal obtained by coupling the flexible coil into a voltage signal through the first resistor R1. R1 in the sampling resistance sampling circuit uses an integrating circuit to realize that the voltage signal output to the active differential amplifier circuit is proportional to the voltage signal on the first resistor R1.
图4是本实用新型中有源差分放大电路及电压跟随器电路图，所述有源差分放大电路包括第三至十电阻R3、R4、R5、R6、R7、R8、R9、R10，电压跟随器包括第一电压跟随器IC1、第二电压跟随器IC2和第三电压跟随器IC3；其中，Fig. 4 is the circuit diagram of active differential amplifier circuit and voltage follower in the utility model, described active differential amplifier circuit comprises the 3rd to ten resistors R3, R4, R5, R6, R7, R8, R9, R10, voltage follower Including the first voltage follower IC1, the second voltage follower IC2 and the third voltage follower IC3; wherein,
第三电阻R3的一端与电容C的一端连接，第三电阻R3的另一端与第五电阻R5的一端、第一电压跟随器IC1的负输入端分别连接，第一电压跟随器IC1的正输入端接地，第一电压跟随器IC1的输出端与第七电阻R7的一端连接，第七电阻R7的另一端与第九电阻R9的一端、第三电压跟随器IC3的负输入端分别连接，第九电阻R9的另一端与第三电压跟随器IC3的输出端连接；第四电阻R4的一端与电容C的另一端连接，第四电阻R4的另一端与第六电阻R6的一端、第二电压跟随器IC2的负输入端连接，第二电压跟随器IC2的正输入端接地，第六电阻R6的另一端与第二电压跟随器IC2的输出端、第八电阻R8的一端分别连接，第八电阻R8的另一端与第三电压跟随器IC3的正输入端、第十电阻R10的一端分别连接，第十电阻R10的另一端接地。One end of the third resistor R3 is connected to one end of the capacitor C, the other end of the third resistor R3 is connected to one end of the fifth resistor R5 and the negative input end of the first voltage follower IC1 respectively, and the positive input of the first voltage follower IC1 The terminal is grounded, the output terminal of the first voltage follower IC1 is connected to one terminal of the seventh resistor R7, the other terminal of the seventh resistor R7 is connected to one terminal of the ninth resistor R9, and the negative input terminal of the third voltage follower IC3 is respectively connected. The other end of the nine resistor R9 is connected to the output end of the third voltage follower IC3; one end of the fourth resistor R4 is connected to the other end of the capacitor C, the other end of the fourth resistor R4 is connected to one end of the sixth resistor R6, and the second voltage The negative input terminal of the follower IC2 is connected, the positive input terminal of the second voltage follower IC2 is grounded, the other end of the sixth resistor R6 is connected to the output terminal of the second voltage follower IC2, and one end of the eighth resistor R8 respectively, and the eighth The other end of the resistor R8 is respectively connected to the positive input end of the third voltage follower IC3 and one end of the tenth resistor R10, and the other end of the tenth resistor R10 is grounded.
第一电压跟随器IC1、第二电压跟随器IC2构成的放大电路增益为100倍。第三电压跟随器IC3构成的放大电路为增益为1倍，第一电压跟随器IC1、第二电压跟随器IC2由LM358双向运算放大器组成，第三电压跟随器IC3由单运算放大器OP27组成，输入信号接至积分电路的电容C的两端，运算放大器的供电由±12V直流电源供电，它的工作过程是：来自积分电路的电压信号经第一电压跟随器IC1、第二电压跟随器IC2放大后接到第三电压跟随器IC3构成的放大电路输入端，由输出端口9输出，电路的器件参数为：R3＝R4＝1kΩ，R5＝R6＝100kΩ，R7＝R8＝R9＝R10＝10kΩ。The amplification circuit formed by the first voltage follower IC1 and the second voltage follower IC2 has a gain of 100 times. The amplifying circuit composed of the third voltage follower IC3 has a gain of 1 time. The first voltage follower IC1 and the second voltage follower IC2 are composed of LM358 bidirectional operational amplifiers. The third voltage follower IC3 is composed of a single operational amplifier OP27. Input The signal is connected to both ends of the capacitor C of the integrating circuit, and the power supply of the operational amplifier is supplied by a ±12V DC power supply. Its working process is: the voltage signal from the integrating circuit is amplified by the first voltage follower IC1 and the second voltage follower IC2 After receiving the input end of the amplifying circuit formed by the third voltage follower IC3, it is output by the output port 9. The device parameters of the circuit are: R3=R4=1kΩ, R5=R6=100kΩ, R7=R8=R9=R10=10kΩ.
电压跟随器是将放大的信号进行缓冲输出，后端接显示负载，减小显示负载装置对有源差分放大电路的影响以提高输出的稳定性。The voltage follower buffers the amplified signal and outputs it, and then connects it to the display load to reduce the influence of the display load device on the active differential amplifier circuit to improve the stability of the output.
本实用新型的完整工作过程是将柔性感应线绕在导线上，当导线中有电流流过时将在柔性感应线圈两端的第一电阻R1上感应出电压信号，经过积分电路中的R1恢复出导线中的电流信号，积分电路中电流两端的电压波形与导线中的电流波形一致，电压的幅值与电流有一定的对应关系，经过有源差分放大电路进行放大后，输出的信号加到电压跟随电路进行输出，输出的值可直接通过电压表或示波器采取，通过一定的换算关系得出导线中的电流值。The complete working process of the utility model is to wind the flexible induction wire on the wire, and when the current flows in the wire, a voltage signal will be induced on the first resistor R1 at both ends of the flexible induction coil, and the wire will be recovered through R1 in the integral circuit The current signal in the circuit, the voltage waveform at both ends of the current in the integrating circuit is consistent with the current waveform in the wire, and the voltage amplitude has a certain corresponding relationship with the current. After being amplified by the active differential amplifier circuit, the output signal is added to the voltage follower The circuit outputs, and the output value can be directly taken by a voltmeter or an oscilloscope, and the current value in the wire can be obtained through a certain conversion relationship.
显然，本实用新型的上述实施例仅仅是为清楚地说明本实用新型所作的举例，而并非是对本实用新型的实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。而这些属于本实用新型的实质精神所引伸出的显而易见的变化或变动仍属于本实用新型的保护范围。Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or changes derived from the essential spirit of the present utility model still belong to the protection scope of the present utility model.
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