CN107328979A - A kind of simplex winding Toroidal current sensor - Google Patents
A kind of simplex winding Toroidal current sensor Download PDFInfo
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- CN107328979A CN107328979A CN201710479003.1A CN201710479003A CN107328979A CN 107328979 A CN107328979 A CN 107328979A CN 201710479003 A CN201710479003 A CN 201710479003A CN 107328979 A CN107328979 A CN 107328979A
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
本发明提供一种单绕组环形磁通门电流传感器，采用坡莫合金作为磁通门探头的磁芯材料，产生的磁通门信号的信噪比足够高，无需通过二次绕组产生补偿磁场形成闭环反馈，能够直接进入信号调理电路中进行误差校正和信号放大；因此本发明将现有的双绕组线圈改为单绕组线圈，只使用一个初级绕组就能够实现电流信号到磁通门信号、磁通门信号到电压信号的转化，从而测量出被测电流线中的电流信号，本发明不但简化了产品工艺，还增加了产品可靠度，测量被测电流线的电流信号时，精度更高；本发明还对信号调理电路进行了改进，通过两级放大电路对输出信号进行调理，保证产品性能不降级。
The invention provides a single-winding annular fluxgate current sensor, which adopts permalloy as the magnetic core material of the fluxgate probe, and the signal-to-noise ratio of the generated fluxgate signal is high enough, without the need to generate a compensation magnetic field through the secondary winding. Closed-loop feedback can directly enter the signal conditioning circuit for error correction and signal amplification; therefore, the present invention changes the existing double-winding coil into a single-winding coil, and only uses one primary winding to realize the current signal to the fluxgate signal, magnetic Through the conversion of the gate signal to the voltage signal, the current signal in the measured current line is measured. The invention not only simplifies the product process, but also increases the reliability of the product. When measuring the current signal of the measured current line, the accuracy is higher; The invention also improves the signal conditioning circuit, and adjusts the output signal through a two-stage amplifying circuit to ensure that the product performance is not degraded.
Description
技术领域technical field
本发明属于电流传感器技术领域，尤其涉及一种单绕组环形磁通门电流传感器。The invention belongs to the technical field of current sensors, in particular to a single-winding annular fluxgate current sensor.
背景技术Background technique
现有磁通门电流传感器技术均为双绕组方案，如图1所示，通过激励电路13在初级绕组11产生磁通门信号，但磁通门信号的信噪比不够高，如果直接进行放大，则通过该磁通门信号测量出被测电流线中的电流信号精度不高，因此磁通门信号需要经滤波电路14滤波后由信号调理电路进行调理，然后经反馈补偿电路16在次级绕组12上产生补偿磁场形成闭环反馈，提高信噪比。此外，现有技术采用硅钢磁芯，使得产品体积较大，限制了产品的通用性；同时初级、次级双绕组会增加工艺复杂度，降低产品可靠度。Existing fluxgate current sensor technology is a dual-winding scheme, as shown in Figure 1, the fluxgate signal is generated in the primary winding 11 through the excitation circuit 13, but the signal-to-noise ratio of the fluxgate signal is not high enough, if directly amplified , the accuracy of the current signal in the measured current line measured by the fluxgate signal is not high, so the fluxgate signal needs to be conditioned by the signal conditioning circuit after being filtered by the filter circuit 14, and then the feedback compensation circuit 16 is used in the secondary A compensation magnetic field is generated on the winding 12 to form a closed-loop feedback to improve the signal-to-noise ratio. In addition, the existing technology uses a silicon steel magnetic core, which makes the product larger and limits the versatility of the product; at the same time, the primary and secondary dual windings will increase the process complexity and reduce the product reliability.
发明内容Contents of the invention
为解决上述问题，本发明提供一种单绕组环形磁通门电流传感器，本发明对磁芯材料、电路原理进行了重新设计，将磁芯尺寸减小，双绕组改为单绕组，在满足准确测量待测电流线中的电流信号性能要求的前提下，还减小了产品的体积，简化了生产工艺。In order to solve the above problems, the present invention provides a single-winding toroidal fluxgate current sensor. The present invention redesigns the magnetic core material and circuit principle, reduces the size of the magnetic core, and changes the double winding to a single winding. Under the premise of measuring the performance requirements of the current signal in the current line to be tested, the volume of the product is also reduced, and the production process is simplified.
一种单绕组环形磁通门电流传感器，包括磁通门探头和信号处理电路，其中信号处理电路包括滤波电路31、激励电路32、电源电路33以及信号调理电路34；所述电源电路33给信号调理电路34提供稳定电压，激励电路32给磁通门探头提供激励信号，从而磁通门探头产生磁通门信号，滤波电路31对磁通门探头产生的磁通门信号进行滤波；A single-winding annular fluxgate current sensor includes a fluxgate probe and a signal processing circuit, wherein the signal processing circuit includes a filter circuit 31, an excitation circuit 32, a power supply circuit 33 and a signal conditioning circuit 34; the power supply circuit 33 provides signal The conditioning circuit 34 provides a stable voltage, and the excitation circuit 32 provides an excitation signal to the fluxgate probe, so that the fluxgate probe generates a fluxgate signal, and the filter circuit 31 filters the fluxgate signal generated by the fluxgate probe;
所述信号调理电路34对滤波后的磁通门信号的零点偏置、灵敏度误差进行校正，并将校正后的磁通门信号直接经过二级放大，并调理成模拟电压信号输出，其中模拟电压信号与被测电流线中电流信号的对应；The signal conditioning circuit 34 corrects the zero offset and sensitivity error of the filtered fluxgate signal, and directly amplifies the corrected fluxgate signal through two stages, and adjusts it into an analog voltage signal output, wherein the analog voltage The correspondence between the signal and the current signal in the measured current line;
所述磁通门探头包括初级绕组21，且初级绕组21为外层缠绕有漆包线的环形磁芯，其中环形磁芯的材料为坡莫合金，且漆包线两端分别缠绕并焊接在激励电路32上；The fluxgate probe includes a primary winding 21, and the primary winding 21 is an annular magnetic core wound with an enameled wire on the outer layer, wherein the material of the annular magnetic core is permalloy, and the two ends of the enameled wire are respectively wound and welded on the excitation circuit 32 ;
被测电流线从所述环形磁芯中间穿过，在所述激励信号的作用下，磁通门探头感应所述被测电流线周围的磁场，从而产生磁通门信号。The measured current line passes through the middle of the ring magnetic core, and under the action of the excitation signal, the fluxgate probe induces the magnetic field around the measured current line, thereby generating a fluxgate signal.
进一步地，所述磁通门探头还包括骨架22；Further, the fluxgate probe also includes a skeleton 22;
所述骨架22形状与初级绕组21形状匹配，同时中间开有穿线孔26，且初级绕组21环绕穿线孔26放置在骨架22中，则被测电流线从穿线孔26中间穿过；The shape of the skeleton 22 matches the shape of the primary winding 21, and there is a threading hole 26 in the middle, and the primary winding 21 is placed in the skeleton 22 around the threading hole 26, and the measured current line passes through the middle of the threading hole 26;
所述骨架22的边框上设有安装座，同时安装座上设有绕线焊针Ⅰ23、绕线焊针Ⅱ24、固定焊针Ⅰ27以及固定焊针Ⅱ28；The frame 22 is provided with a mounting seat, and the mounting seat is provided with a winding welding needle I23, a winding welding needle II24, a fixed welding needle I27 and a fixed welding needle II28;
所述初级绕组21的漆包线两端分别缠绕并焊接在绕线焊针Ⅰ23和绕线焊针Ⅱ24上，绕线焊针Ⅰ23和绕线焊针Ⅱ24再分别连接在激励电路32上；The two ends of the enameled wire of the primary winding 21 are respectively wound and welded on the winding welding pin I23 and the winding welding pin II24, and the winding welding pin I23 and the winding welding pin II24 are respectively connected to the excitation circuit 32;
所述骨架22通过安装座、固定焊针Ⅰ27以及固定焊针Ⅱ28与电路板连接，其中所述信号处理电路焊接在电路板上。The frame 22 is connected to the circuit board through the mounting seat, the fixed welding pin I 27 and the fixed welding pin II 28 , wherein the signal processing circuit is welded on the circuit board.
进一步地，所述骨架22边框上设有4个安装座，其中绕线焊针Ⅰ23和绕线焊针Ⅱ24设于同一个安装座上，固定焊针Ⅰ27和固定焊针Ⅱ28分别设在一个安装座上，且安装座上设有高度低于4个焊针高度的凸台。Further, four mounting seats are provided on the frame 22, wherein the winding welding needle I23 and the winding welding needle II24 are arranged on the same mounting seat, and the fixed welding needle I27 and the fixed welding needle II28 are respectively arranged on a mounting seat. On the seat, and the mounting seat is provided with a boss whose height is lower than the height of 4 welding pins.
进一步地，设有绕线焊针Ⅰ23和绕线焊针Ⅱ24的安装座处还开有过线槽25。Further, there is a wire slot 25 at the mounting seat where the wire-wound soldering pin I 23 and the wire-wound soldering pin II 24 are provided.
进一步地，所述滤波电路31包括运算放大器N1B，电阻R10以及电容C1、C2、C5、C6；Further, the filter circuit 31 includes an operational amplifier N1B, a resistor R10 and capacitors C1, C2, C5, and C6;
所述电容C1、C2为滤波电容，两者均各取一端连接在运算放大器N1B的电源端，另一端接地；运算放大器N1B输入正端接地，电阻R10两端分别连接运算放大器N1B的输入负端和输出端，电容C5、C6串联后两端分别连接运算放大器N1B的输入负端和输出端，且电容C5、C6连接点处作为磁通门信号的输入端。The capacitors C1 and C2 are filter capacitors, each of which has one end connected to the power supply terminal of the operational amplifier N1B, and the other end is grounded; the positive input terminal of the operational amplifier N1B is grounded, and the two ends of the resistor R10 are respectively connected to the negative input terminal of the operational amplifier N1B and the output terminal, capacitors C5 and C6 are connected in series to the input negative terminal and output terminal of the operational amplifier N1B respectively, and the connection point of the capacitors C5 and C6 is used as the input terminal of the fluxgate signal.
进一步地，所述激励电路32包括运算放大器N1A，稳压管V3、V4，电阻R1、R2、R5、R6以及电容C8；Further, the excitation circuit 32 includes an operational amplifier N1A, voltage regulator tubes V3, V4, resistors R1, R2, R5, R6, and a capacitor C8;
所述运算放大器N1A的输入正端通过电阻R5接地，且输入正端通过电阻R6连接自身的输出端；运算放大器N1A的输出端连接稳压管V3正端，且稳压管V3负端连接稳压管V4负端，稳压管V4正端接地；磁通门探头和电容C8并联于运算放大器N1A的输入负端和输出端之间；同时，运算放大器N1A的输入负端通过电阻R2接地，且输入负端通过电阻R1向滤波电路31输出磁通门信号。The positive input terminal of the operational amplifier N1A is grounded through a resistor R5, and the positive input terminal is connected to its own output terminal through a resistor R6; the output terminal of the operational amplifier N1A is connected to the positive terminal of the regulator tube V3, and the negative terminal of the regulator tube V3 is connected to the regulator. The negative terminal of the voltage tube V4 and the positive terminal of the voltage regulator tube V4 are grounded; the fluxgate probe and the capacitor C8 are connected in parallel between the negative input terminal and the output terminal of the operational amplifier N1A; at the same time, the negative input terminal of the operational amplifier N1A is grounded through the resistor R2, And the input negative terminal outputs the fluxgate signal to the filter circuit 31 through the resistor R1.
进一步地，所述电源电路33包括稳压二极管V1、V2以及限流电阻R3、R7；Further, the power supply circuit 33 includes Zener diodes V1, V2 and current limiting resistors R3, R7;
所述限流电阻R3、稳压二极管V1、稳压二极管V2以及限流电阻R7依次串联，且限流电阻R3、R7的空脚分别连接正电源、负电源，稳压二极管V1、V2之间的串联连接点接地；电源电路33从稳压二极管V1负端和稳压二极管V2正端输出稳定后的电压，给信号调理电路34供电。The current limiting resistor R3, Zener diode V1, Zener diode V2, and current limiting resistor R7 are connected in series in sequence, and the empty legs of the current limiting resistors R3 and R7 are respectively connected to the positive power supply and the negative power supply, between the Zener diodes V1 and V2 The series connection point of the zener diode V1 is grounded; the power supply circuit 33 outputs a stabilized voltage from the negative terminal of the zener diode V1 and the positive terminal of the zener diode V2 to supply power to the signal conditioning circuit 34 .
进一步地，所述信号调理电路34包括运算放大器N2A、N2B，电阻R4、R8、R9、R11～R20，以及电容C3、C4、C7、C9、C10；Further, the signal conditioning circuit 34 includes operational amplifiers N2A, N2B, resistors R4, R8, R9, R11-R20, and capacitors C3, C4, C7, C9, C10;
所述电阻R11、R12为调零电阻，串接于电源电路33的输出端的正负两端之间，同时电阻R11、R12之间的串联连接点处连接电阻R13的一端，电阻R13另一端通过电阻R14接地，并通过电阻R8连接运算放大器N2B的输入负端；运算放大器N2B的输入正端通过电阻R4连接至激励电路32的磁通门信号输出端；电阻R15、R16、R18为调试电阻，且电阻R16和电阻R18并联后再与电阻R15串联，然后两个串联端与电容C9并联，两个并联端再连接于运算放大器N2B的输入负端和输出端之间；The resistors R11 and R12 are zero-adjusting resistors, which are connected in series between the positive and negative ends of the output terminal of the power supply circuit 33. At the same time, the series connection point between the resistors R11 and R12 is connected to one end of the resistor R13, and the other end of the resistor R13 passes through Resistor R14 is grounded and connected to the negative input terminal of operational amplifier N2B through resistor R8; the positive input terminal of operational amplifier N2B is connected to the fluxgate signal output terminal of excitation circuit 32 through resistor R4; resistors R15, R16 and R18 are debugging resistors, And the resistance R16 and the resistance R18 are connected in parallel and then connected in series with the resistance R15, and then the two series terminals are connected in parallel with the capacitor C9, and the two parallel terminals are connected between the input negative terminal and the output terminal of the operational amplifier N2B;
所述电容C3、C4为滤波电容，其中一端均分别连接在运算放大器N2B的电源端，另一端接地；同时，运算放大器N2B的输出端通过电阻R19连接至运算放大器N2A的输入正端；电容C7和电阻R20并联于运算放大器N2A的输入正端和地之间；运算放大器N2A的输入负端通过电阻R9接地，电阻R17和电容C10并联于运算放大器N2A的输入负端和输出端之间，运算放大器N2A的输出的模拟电压信号为电流传感器的最终输出。The capacitors C3 and C4 are filter capacitors, one end of which is respectively connected to the power supply end of the operational amplifier N2B, and the other end is grounded; meanwhile, the output terminal of the operational amplifier N2B is connected to the positive input terminal of the operational amplifier N2A through a resistor R19; the capacitor C7 The resistor R20 is connected in parallel between the input positive terminal of the operational amplifier N2A and the ground; the input negative terminal of the operational amplifier N2A is grounded through the resistor R9, and the resistor R17 and the capacitor C10 are connected in parallel between the input negative terminal and the output terminal of the operational amplifier N2A. The analog voltage signal of the output of the amplifier N2A is the final output of the current sensor.
优选地，所述磁芯外层缠绕1000～2000圈漆包线。Preferably, the outer layer of the magnetic core is wound with 1000-2000 turns of enameled wire.
有益效果：Beneficial effect:
1、现有磁通门传感器采用双绕组模式，本发明采用坡莫合金作为磁通门探头的磁芯材料，产生的磁通门信号的信噪比足够高，无需通过二次绕组产生补偿磁场形成闭环反馈，能够直接进入信号调理电路中进行误差校正和信号放大；因此本发明将现有的双绕组线圈改为单绕组线圈，只使用一个初级绕组就能够实现电流信号到磁通门信号、磁通门信号到电压信号的转化，从而测量出被测电流线中的电流信号，本发明不但简化了产品工艺，还增加了产品可靠度，测量被测电流线的电流信号时，精度更高；1. The existing fluxgate sensor adopts a double winding mode. The present invention uses permalloy as the magnetic core material of the fluxgate probe, and the signal-to-noise ratio of the generated fluxgate signal is high enough, and there is no need to generate a compensation magnetic field through the secondary winding Forming a closed-loop feedback can directly enter the signal conditioning circuit for error correction and signal amplification; therefore, the present invention changes the existing double-winding coil into a single-winding coil, and only uses one primary winding to realize the current signal to the fluxgate signal, The fluxgate signal is transformed into a voltage signal, thereby measuring the current signal in the measured current line. The invention not only simplifies the product process, but also increases product reliability. When measuring the current signal of the measured current line, the accuracy is higher ;
同时本发明配合单绕组线圈对电路方案进行了改进，包括取消了反馈补偿电路，无需产生补偿磁场，改为采用二级放大电路直接放大的开环方案，直接放大磁通门信号的输出；本发明简化了电源电路，针对新磁芯和线圈，对激励电路进行了重新设计，增强了激励信号的稳定性；同时还对滤波电路进行了调整，提高了滤波器阻带抑制度；最后对信号调理电路进行了改进，通过两级放大电路对输出信号进行调理，保证产品性能不降级；Simultaneously, the present invention cooperates with the single-winding coil to improve the circuit scheme, including canceling the feedback compensation circuit, without generating a compensation magnetic field, and changing it to an open-loop scheme directly amplified by a secondary amplifying circuit, directly amplifying the output of the fluxgate signal; The invention simplifies the power supply circuit, redesigns the excitation circuit for the new magnetic core and coil, and enhances the stability of the excitation signal; at the same time, it also adjusts the filter circuit to improve the filter stop band rejection; finally, the signal The conditioning circuit has been improved, and the output signal is conditioned by a two-stage amplifying circuit to ensure that the product performance is not degraded;
本发明将磁芯尺寸减小，选择高导磁率的坡莫合金磁芯替换现有的硅钢磁芯，增强信号强度的同时减小了产品的体积和重量，使本来较大的产品可以应用到对体积和重量有限制要求的系统中，增加了产品通用性。The invention reduces the size of the magnetic core, selects the Permalloy magnetic core with high magnetic permeability to replace the existing silicon steel magnetic core, increases the signal strength and reduces the volume and weight of the product, so that the originally larger product can be applied to Increased product versatility in systems with limited volume and weight requirements.
2、本发明将初级绕组置于骨架中，通过骨架将磁通门探头固定在电路板上，使磁通门电流传感器结构更为稳固；同时，在骨架的安装座上设置凸台，使得骨架倒置安装在电路板上时，初级绕组与绕线焊针的焊接点不被压迫损坏。2. In the present invention, the primary winding is placed in the skeleton, and the fluxgate probe is fixed on the circuit board through the skeleton, so that the structure of the fluxgate current sensor is more stable; at the same time, a boss is set on the mounting seat of the skeleton, so that the skeleton When it is installed upside down on the circuit board, the soldering point between the primary winding and the wire-wound soldering pin will not be compressed and damaged.
3、本发明绕线焊针Ⅰ和绕线焊针Ⅱ的安装座处还开有过线槽，有利于保护初级绕组的漆包线不被压损。3. The mounting seats of the wire-wound soldering pin I and the wire-wound soldering pin II of the present invention are also provided with wire grooves, which is beneficial to protect the enameled wire of the primary winding from being crushed.
附图说明Description of drawings
图1为原有方案传感器电路原理图；Fig. 1 is the schematic diagram of the sensor circuit of the original scheme;
图2为本发明传感器探头结构示意图；Fig. 2 is the structural representation of sensor probe of the present invention;
图3为本发明传感器电路原理图；Fig. 3 is a schematic diagram of the sensor circuit of the present invention;
11-现有方案初级绕组，12-现有方案次级绕组，13-现有方案激励电路，14-现有方案滤波电路，15-现有方案信号调理电路，16-现有方案反馈补偿电路，17-现有方案信号电源电路，21-初级绕组，22-骨架，23-绕线焊针Ⅰ，24-绕线焊针Ⅱ，25-过线槽，26-穿线孔，27-固定焊针Ⅰ，28-固定焊针Ⅱ，31-滤波电路，32-激励电路，33-信号调理电路，34-信号电源电路，35-磁通门探头。11-primary winding of existing scheme, 12-secondary winding of existing scheme, 13-excitation circuit of existing scheme, 14-filtering circuit of existing scheme, 15-signal conditioning circuit of existing scheme, 16-feedback compensation circuit of existing scheme , 17-existing scheme signal power supply circuit, 21-primary winding, 22-skeleton, 23-winding welding needle Ⅰ, 24-winding welding needle Ⅱ, 25-passing slot, 26-threading hole, 27-fixed welding Needle I, 28-fixed welding needle II, 31-filter circuit, 32-excitation circuit, 33-signal conditioning circuit, 34-signal power supply circuit, 35-fluxgate probe.
具体实施方式detailed description
下面结合附图并举实施例，对本发明进行详细叙述。The present invention will be described in detail below with reference to the accompanying drawings and examples.
一种单绕组环形磁通门电流传感器，包括磁通门探头和信号处理电路；A single-winding toroidal fluxgate current sensor, comprising a fluxgate probe and a signal processing circuit;
如图3所示，为本发明传感器电路原理图，所述信号处理电路包括滤波电路31、激励电路32、电源电路33、信号调理电路34以及磁通门探头35，其中电源电路33给信号调理电路34提供稳定电压，激励电路32给磁通门探头35提供激励信号，从而磁通门探头35产生磁通门信号，滤波电路31对磁通门探头35产生的磁通门信号进行滤波，信号调理电路34对所述信号处理电路以及滤波后的磁通门信号的零点偏置、灵敏度误差进行校正，并将校正后的磁通门信号调理成模拟电压信号输出，其中模拟电压信号与被测电流线中电流信号的对应；As shown in Figure 3, it is the sensor circuit schematic diagram of the present invention, and described signal processing circuit comprises filter circuit 31, excitation circuit 32, power supply circuit 33, signal conditioning circuit 34 and fluxgate probe 35, wherein power supply circuit 33 provides signal conditioning The circuit 34 provides a stable voltage, and the excitation circuit 32 provides an excitation signal to the fluxgate probe 35, so that the fluxgate probe 35 generates a fluxgate signal, and the filter circuit 31 filters the fluxgate signal generated by the fluxgate probe 35, and the signal The conditioning circuit 34 corrects the zero point offset and sensitivity error of the signal processing circuit and the filtered fluxgate signal, and adjusts the corrected fluxgate signal into an analog voltage signal output, wherein the analog voltage signal is consistent with the measured Correspondence of the current signal in the current line;
如图2所示，为本发明传感器探头结构示意图，所述磁通门探头35包括初级绕组21，且初级绕组21作为信号处理电路中的磁通门探头35；As shown in Figure 2, it is a schematic structural diagram of the sensor probe of the present invention, the fluxgate probe 35 includes a primary winding 21, and the primary winding 21 is used as the fluxgate probe 35 in the signal processing circuit;
所述初级绕组21为外层缠绕有漆包线的环形磁芯，且漆包线两端分别缠绕并焊接在激励电路32上；The primary winding 21 is a ring magnetic core with an enameled wire wound on the outer layer, and the two ends of the enameled wire are respectively wound and welded on the excitation circuit 32;
被测电流线从所述环形磁芯中间穿过，在所述激励信号的作用下，磁通门探头35感应所述被测电流线周围的磁场，从而产生磁通门信号。The measured current line passes through the middle of the ring magnetic core, and under the action of the excitation signal, the fluxgate probe 35 induces the magnetic field around the measured current line, thereby generating a fluxgate signal.
进一步地，所述磁通门探头35还包括骨架22；Further, the fluxgate probe 35 also includes a skeleton 22;
所述骨架22形状与初级绕组21形状匹配，同时中间开有穿线孔26，且初级绕组21放置在骨架22和穿线孔26之间，则被测电流线从穿线孔26中间穿过；The shape of the skeleton 22 matches the shape of the primary winding 21, and there is a threading hole 26 in the middle, and the primary winding 21 is placed between the skeleton 22 and the threading hole 26, and the measured current line passes through the middle of the threading hole 26;
所述骨架22的边框上设有安装座，同时安装座上设有绕线焊针Ⅰ23、绕线焊针Ⅱ24、固定焊针Ⅰ27以及固定焊针Ⅱ28；The frame 22 is provided with a mounting seat, and the mounting seat is provided with a winding welding needle I23, a winding welding needle II24, a fixed welding needle I27 and a fixed welding needle II28;
所述初级绕组21的漆包线两端分别缠绕并焊接在绕线焊针Ⅰ23和绕线焊针Ⅱ24上，绕线焊针Ⅰ23和绕线焊针Ⅱ24再分别连接在激励电路32上；The two ends of the enameled wire of the primary winding 21 are respectively wound and welded on the winding welding pin I23 and the winding welding pin II24, and the winding welding pin I23 and the winding welding pin II24 are respectively connected to the excitation circuit 32;
所述骨架22通过安装座、固定焊针Ⅰ27以及固定焊针Ⅱ28与电路板连接。The frame 22 is connected to the circuit board through the mounting seat, the fixed welding pin I 27 and the fixed welding pin II 28 .
进一步地，所述滤波电路31包括运算放大器N1B，电阻R10以及电容C1、C2、C5、C6；Further, the filter circuit 31 includes an operational amplifier N1B, a resistor R10 and capacitors C1, C2, C5, and C6;
所述电容C1、C2为滤波电容，分别一端连接在运算放大器N1B的的电源端，另一端接地；运算放大器N1B输入正端接地，电阻R10两端分别连接运算放大器N1B的输入负端和输出端，电容C5、C6串联后两端分别连接运算放大器N1B的输入负端和输出端，且电容C5、C6连接点处连接磁通门探头35磁通门信号的输出端。The capacitors C1 and C2 are filter capacitors, one end is connected to the power supply terminal of the operational amplifier N1B, and the other end is grounded; the positive input terminal of the operational amplifier N1B is grounded, and the two ends of the resistor R10 are respectively connected to the input negative terminal and the output terminal of the operational amplifier N1B After the capacitors C5 and C6 are connected in series, the two ends are respectively connected to the negative input terminal and the output terminal of the operational amplifier N1B, and the connection point of the capacitors C5 and C6 is connected to the output terminal of the fluxgate signal of the fluxgate probe 35 .
进一步地，所述激励电路32包括运算放大器N1A，稳压管V3、V4，电阻R1、R2、R5、R6以及电容C8；Further, the excitation circuit 32 includes an operational amplifier N1A, voltage regulator tubes V3, V4, resistors R1, R2, R5, R6, and a capacitor C8;
所述运算放大器N1A的输入正端通过电阻R5接地，且输入正端通过电阻R6连接自身的输出端；运算放大器N1A的输出端连接稳压管V3正端，且稳压管V3负端连接稳压管V4负端，稳压管V4正端接地；磁通门探头35和电容C8并联于运算放大器N1A的输入负端和输出端之间；同时，运算放大器N1A的输入负端通过电阻R2接地，且输入负端通过电阻R1向滤波电路31输出磁通门信号。The positive input terminal of the operational amplifier N1A is grounded through a resistor R5, and the positive input terminal is connected to its own output terminal through a resistor R6; the output terminal of the operational amplifier N1A is connected to the positive terminal of the regulator tube V3, and the negative terminal of the regulator tube V3 is connected to the regulator. The negative terminal of the voltage tube V4 and the positive terminal of the voltage regulator tube V4 are grounded; the fluxgate probe 35 and the capacitor C8 are connected in parallel between the negative input terminal and the output terminal of the operational amplifier N1A; at the same time, the negative input terminal of the operational amplifier N1A is grounded through the resistor R2 , and the input negative terminal outputs the fluxgate signal to the filter circuit 31 through the resistor R1.
进一步地，所述电源电路33包括稳压二极管V1、V2以及限流电阻R3、R7；Further, the power supply circuit 33 includes Zener diodes V1, V2 and current limiting resistors R3, R7;
所述限流电阻R3、稳压二极管V1、稳压二极管V2以及限流电阻R7依次按顺序串联，且限流电阻R3、R7的空脚分别连接正电源、负电源，稳压二极管V1、V2之间的串联连接点接地；电源电路33从稳压二极管V1负端和稳压二极管V2正端输出稳定后的电压，给信号调理电路34供电。The current limiting resistor R3, voltage stabilizing diode V1, voltage stabilizing diode V2 and current limiting resistor R7 are sequentially connected in series, and the empty legs of the current limiting resistors R3 and R7 are respectively connected to the positive power supply and the negative power supply, and the voltage stabilizing diodes V1 and V2 The series connection point between them is grounded; the power supply circuit 33 outputs a stabilized voltage from the negative terminal of the Zener diode V1 and the positive terminal of the Zener diode V2 to supply power to the signal conditioning circuit 34 .
进一步地，所述信号调理电路34包括运算放大器N2A、N2B，电阻R4、R8、R9、R11～R20，以及电容C3、C4、C7、C9、C10；Further, the signal conditioning circuit 34 includes operational amplifiers N2A, N2B, resistors R4, R8, R9, R11-R20, and capacitors C3, C4, C7, C9, C10;
所述电阻R11、R12为调零电阻，串接于电源电路33的输出端的正负两端之间，同时电阻R11、R12之间的串联连接点处连接电阻R13；电阻R13另一端通过电阻R14接地，并通过电阻R8连接运算放大器N2B的输入负端；运算放大器N2B的输入正端通过电阻R4连接至激励电路32的磁通门信号输出端；电阻R15、R16、R18为调试电阻，且电阻R16和电阻R18并联后再与电阻R15串联，然后两个串联端与电容C9并联，两个并联端再连接于运算放大器N2B的输入负端和输出端之间；The resistors R11 and R12 are zero-adjusting resistors, which are connected in series between the positive and negative ends of the output terminal of the power supply circuit 33, and the resistor R13 is connected to the series connection point between the resistors R11 and R12 at the same time; the other end of the resistor R13 passes through the resistor R14 Grounded, and connected to the negative input terminal of the operational amplifier N2B through the resistor R8; the positive input terminal of the operational amplifier N2B is connected to the fluxgate signal output terminal of the excitation circuit 32 through the resistor R4; the resistors R15, R16, and R18 are debugging resistors, and the resistor R16 and resistor R18 are connected in parallel and then connected in series with resistor R15, then the two series terminals are connected in parallel with capacitor C9, and the two parallel terminals are connected between the input negative terminal and the output terminal of the operational amplifier N2B;
所述电容C3、C4为滤波电容，其中一端均分别连接在运算放大器N2B的电源端，另一端接地；同时，运算放大器N2B的输出端通过电阻R19连接至运算放大器N2A的输入正端；电容C7和电阻R20并联于运算放大器N2A的输入正端和地之间；运算放大器N2A的输入负端通过电阻R9接地，电阻R17和电容C10并联于运算放大器N2A的输入负端和输出端之间，运算放大器N2A的输出的模拟电压信号为电流传感器的最终输出。The capacitors C3 and C4 are filter capacitors, one end of which is respectively connected to the power supply end of the operational amplifier N2B, and the other end is grounded; meanwhile, the output terminal of the operational amplifier N2B is connected to the positive input terminal of the operational amplifier N2A through a resistor R19; the capacitor C7 The resistor R20 is connected in parallel between the input positive terminal of the operational amplifier N2A and the ground; the input negative terminal of the operational amplifier N2A is grounded through the resistor R9, and the resistor R17 and the capacitor C10 are connected in parallel between the input negative terminal and the output terminal of the operational amplifier N2A. The analog voltage signal of the output of the amplifier N2A is the final output of the current sensor.
进一步地，所述环形磁芯的材料为坡莫合金。Further, the material of the annular magnetic core is permalloy.
进一步地，所述磁芯外层缠绕1000～2000圈漆包线。Further, the outer layer of the magnetic core is wound with 1000-2000 turns of enameled wire.
进一步地，所述骨架22边框上设有4个安装座，其中绕线焊针Ⅰ23和绕线焊针Ⅱ24设于同一个安装座上，固定焊针Ⅰ27和固定焊针Ⅱ28分别设在一个安装座上，且安装座上设有高度低于4个焊针高度的凸台。Further, four mounting seats are provided on the frame 22, wherein the winding welding needle I23 and the winding welding needle II24 are arranged on the same mounting seat, and the fixed welding needle I27 and the fixed welding needle II28 are respectively arranged on a mounting seat. On the seat, and the mounting seat is provided with a boss whose height is lower than the height of 4 welding pins.
进一步地，设有绕线焊针Ⅰ23和绕线焊针Ⅱ24的安装座处还开有过线槽25。Further, there is a wire slot 25 at the mounting seat where the wire-wound soldering pin I 23 and the wire-wound soldering pin II 24 are provided.
本发明的单绕组环形磁通门电流传感器方案可使产品体积小于30mm×30mm×20mm，同时在10mA～400mA被测电流范围内测量精度达到1％。The solution of the single-winding annular fluxgate current sensor of the present invention can make the volume of the product smaller than 30mm×30mm×20mm, and at the same time, the measurement accuracy can reach 1% within the range of the measured current of 10mA-400mA.
当然，本发明还可有其他多种实施例，在不背离本发明精神及其实质的情况下，熟悉本领域的技术人员当可根据本发明作出各种相应的改变和变形，但这些相应的改变和变形都应属于本发明所附的权利要求的保护范围。Of course, the present invention can also have other various embodiments, and those skilled in the art can make various corresponding changes and deformations according to the present invention without departing from the spirit and essence of the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.
Claims (9)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164287A (en) * | 2018-10-08 | 2019-01-08 | 深圳市艾华迪技术有限公司 | A kind of hollow coil AC current sensor |
| CN109799380A (en) * | 2019-01-29 | 2019-05-24 | 湖南银河电气有限公司 | A kind of integrated electric flow sensor and its packaging method |
| CN112379146A (en) * | 2020-10-27 | 2021-02-19 | 威胜集团有限公司 | Current sensor |
| CN114706024A (en) * | 2022-04-01 | 2022-07-05 | 哈尔滨工程大学 | A hybrid lock-in amplifier circuit suitable for MEMS fluxgate sensor and its control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201569409U (en) * | 2009-12-23 | 2010-09-01 | 蒋勤舟 | Transformer-type non-contact angle sensor |
| CN102739004A (en) * | 2011-04-02 | 2012-10-17 | 李贵祥 | Cage-shaped opposite claw pole type switch reluctance brushless direct current generating motor |
| CN105799951A (en) * | 2014-12-31 | 2016-07-27 | 上海新跃仪表厂 | Mechanical-electrical integrated micro-magnetic torquer and magnetic torque measurement method |
-
2017
- 2017-06-22 CN CN201710479003.1A patent/CN107328979A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201569409U (en) * | 2009-12-23 | 2010-09-01 | 蒋勤舟 | Transformer-type non-contact angle sensor |
| CN102739004A (en) * | 2011-04-02 | 2012-10-17 | 李贵祥 | Cage-shaped opposite claw pole type switch reluctance brushless direct current generating motor |
| CN105799951A (en) * | 2014-12-31 | 2016-07-27 | 上海新跃仪表厂 | Mechanical-electrical integrated micro-magnetic torquer and magnetic torque measurement method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109164287A (en) * | 2018-10-08 | 2019-01-08 | 深圳市艾华迪技术有限公司 | A kind of hollow coil AC current sensor |
| CN109799380A (en) * | 2019-01-29 | 2019-05-24 | 湖南银河电气有限公司 | A kind of integrated electric flow sensor and its packaging method |
| CN109799380B (en) * | 2019-01-29 | 2021-03-02 | 湖南银河电气有限公司 | Integrated current sensor and packaging method thereof |
| CN112379146A (en) * | 2020-10-27 | 2021-02-19 | 威胜集团有限公司 | Current sensor |
| CN114706024A (en) * | 2022-04-01 | 2022-07-05 | 哈尔滨工程大学 | A hybrid lock-in amplifier circuit suitable for MEMS fluxgate sensor and its control method |
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