CN106291032A - A kind of current detecting unit leakage current eliminates circuit and removing method - Google Patents
A kind of current detecting unit leakage current eliminates circuit and removing method Download PDFInfo
- Publication number
- CN106291032A CN106291032A CN201610633601.5A CN201610633601A CN106291032A CN 106291032 A CN106291032 A CN 106291032A CN 201610633601 A CN201610633601 A CN 201610633601A CN 106291032 A CN106291032 A CN 106291032A
- Authority
- CN
- China
- Prior art keywords
- resistor
- diode
- cathode
- anode
- circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
本发明公开了一种电流检测单元漏电流消除电路及消除方法，属于电流检测领域，包括电阻、电容、电感、二极管以及运算放大器。本发明应用精确、低噪声以及低偏置电流的运算放大器跟随检测信号电压电路构成一个等电位保护电路，产生等电位低阻抗输出作为保护信号，在PCB布局时将高阻抗的信号检测通路加了一个金属保护环，实现了检测通路与附近电路的隔离保护，避免了由于检测通路与附近电路电位差引起的泄漏电流，达到了电流检测单元漏电流消除目的，提高了弱电流检测准确度，充分利用PCB空间；该电路能够准确实现弱电流到电压的转换，完成电流检测功能，而且电路结构简单，成本低廉；在电流检测等相关测量领域中具有良好的应用价值。
The invention discloses a leakage current elimination circuit and elimination method of a current detection unit, which belongs to the field of current detection and includes resistance, capacitance, inductance, diode and operational amplifier. The invention uses an operational amplifier with precision, low noise and low bias current to follow the detection signal voltage circuit to form an equipotential protection circuit, which generates an equipotential low impedance output as a protection signal, and adds a high impedance signal detection path to the PCB layout. A metal protection ring realizes the isolation protection between the detection path and the nearby circuits, avoids the leakage current caused by the potential difference between the detection path and the nearby circuits, achieves the purpose of eliminating the leakage current of the current detection unit, improves the detection accuracy of weak currents, and fully The PCB space is utilized; the circuit can accurately realize the conversion from weak current to voltage and complete the current detection function, and the circuit structure is simple and the cost is low; it has good application value in related measurement fields such as current detection.
Description
技术领域technical field
本发明属于电流检测领域，具体涉及一种电流检测单元漏电流消除电路及消除方法。The invention belongs to the field of current detection, and in particular relates to a current detection unit leakage current elimination circuit and an elimination method.
背景技术Background technique
近年来，经济繁荣，科技快速发展，极大地促进军事、通信、医疗、生物、化学等领域的技术革新，特别是电子测量技术。电子测量技术广泛存在于现实生活中，例如温度、湿度、光、声、力等等的测量。对于这些生活中常见物理量，电子测量技术领域通常由传感器转换成电压或电流信号处理。In recent years, economic prosperity and rapid development of science and technology have greatly promoted technological innovation in military, communication, medical, biological, chemical and other fields, especially electronic measurement technology. Electronic measurement technology widely exists in real life, such as the measurement of temperature, humidity, light, sound, force and so on. For these common physical quantities in life, the field of electronic measurement technology usually converts them into voltage or current signals for processing by sensors.
电压、电流信号是电子测量技术和仪器仪表领域的研究对象，与现代科技发展不可分割。然而随着航天航空、精密仪器测试以及生物医疗电子的快速发展，被测电压、电流信号越来越微弱，甚至达到纳伏和皮安级，使得测量过程变得复杂困难，测量准确度下降。Voltage and current signals are the research objects in the field of electronic measurement technology and instrumentation, and are inseparable from the development of modern science and technology. However, with the rapid development of aerospace, precision instrument testing, and biomedical electronics, the measured voltage and current signals are getting weaker and weaker, even reaching nanovolt and picoamp levels, making the measurement process complicated and difficult, and the measurement accuracy is reduced.
一般情况下，弱电流信号的检测是将电流信号转换成电压信号或者频率信号进行测量。但是弱电流信号转换过程中会不可避免的引入各种误差，例如泄漏电流、偏置电流、压电效应、零点漂移、摩擦电效应、污染和湿度介质吸收效应等等。In general, the detection of weak current signals is to convert the current signals into voltage signals or frequency signals for measurement. However, various errors will inevitably be introduced during the conversion of weak current signals, such as leakage current, bias current, piezoelectric effect, zero drift, triboelectric effect, pollution and humidity medium absorption effect, etc.
泄漏电流是由测量电路和周边元件上电压之间的寄生电阻通路产生的。这种电流会对弱电流信号的测量准确度产生影响。为了获得更加准确的测量结果，研究人员和工程技术人员都在不断的进行探索。目前，高质量的绝缘材料，测试环境温湿度的有效控制等技术应用改善了测量电路和周边元件上电压之间的寄生电阻，从而在一定程度上降低泄漏电流，提高了测量准确度。然而，这种方法并没有从根本上消除漏电流的存在。Leakage currents are created by parasitic resistive paths between the measurement circuit and voltages on surrounding components. This current will affect the measurement accuracy of weak current signals. In order to obtain more accurate measurement results, researchers and engineers are constantly exploring. At present, high-quality insulating materials, effective control of temperature and humidity in the test environment and other technical applications have improved the parasitic resistance between the measurement circuit and the voltage on the surrounding components, thereby reducing the leakage current to a certain extent and improving the measurement accuracy. However, this method does not fundamentally eliminate the existence of leakage current.
传统技术，如改善寄生电阻方法，已经到达一种局限，此外新材料使得PCB印制板加工复杂困难，且价格比较昂贵。为了实现弱电流信号检测过程中漏电流的消除，降低电路PCB生产成本，必须另辟蹊径。因此需要一种新的电路技术和方法来解决。Traditional technologies, such as improving parasitic resistance, have reached a limit. In addition, new materials make PCB printed board processing complicated and difficult, and the price is relatively expensive. In order to realize the elimination of the leakage current in the detection process of the weak current signal and reduce the production cost of the circuit PCB, another method must be found. Therefore, a new circuit technology and method are needed to solve it.
发明内容Contents of the invention
针对现有技术中存在的上述技术问题，本发明提出了一种电流检测单元漏电流消除电路及消除方法，设计合理，克服了现有技术的不足，解决了测量仪器仪表中存在的泄漏电流问题，提高了弱电流检测准确度，具有良好的推广价值。Aiming at the above-mentioned technical problems existing in the prior art, the present invention proposes a current detection unit leakage current elimination circuit and elimination method, which is reasonably designed, overcomes the deficiencies of the prior art, and solves the leakage current problem existing in measuring instruments and meters , which improves the accuracy of weak current detection and has good promotion value.
为了实现上述目的，本发明采用如下技术方案：In order to achieve the above object, the present invention adopts the following technical solutions:
一种电流检测单元漏电流消除电路，包括电阻、电容、电感、二极管以及运算放大器；A leakage current elimination circuit of a current detection unit, including a resistor, a capacitor, an inductor, a diode, and an operational amplifier;
所述电阻包括第一电阻、第二电阻、第三电阻、第四电阻、第五电阻、第六电阻、第七电阻、第八电阻、第九电阻、第十电阻以及第十一电阻；The resistors include a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor and an eleventh resistor;
所述电容包括第一电容、第二电容以及第三电容；The capacitance includes a first capacitance, a second capacitance and a third capacitance;
所述二极管包括第一二极管、第二二极管、第三二极管、第四二极管、第五二极管、第六二极管、第七二极管以及第八二极管；The diodes include a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, a seventh diode and an eighth diode Tube;
第九电阻和第十电阻通过线路连接组成检测电阻；第十电阻、第九电阻、第三电阻和电感通过线路依次连接组成检测电路；第九电阻的另一端和第十电阻的另一端分别连接至第三电容的两端，第十一电阻的一端连接至第十电阻和第三电容组成的公共端，另一端与检测电压的负极端口连接；第一电容、第四电阻和第五电阻通过线路依次连接组成RC滤波电路，第一电容、第四电阻、第五电阻、第六电阻通过线路依次连接至运算放大器的正向输入端，第五电阻和第六电阻组成的公共端连接至第三电阻和第九电阻组成的公共端，第一电容的另一端接地，运算放大器的反向输入端和其输出端相连接，运算放大器的输出端与检测电压的正极端口连接；The ninth resistor and the tenth resistor are connected through a line to form a detection resistor; the tenth resistor, the ninth resistor, the third resistor and the inductance are sequentially connected through a line to form a detection circuit; the other end of the ninth resistor and the other end of the tenth resistor are respectively connected To the two ends of the third capacitor, one end of the eleventh resistor is connected to the common end formed by the tenth resistor and the third capacitor, and the other end is connected to the negative port of the detection voltage; the first capacitor, the fourth resistor and the fifth resistor pass through The lines are connected in sequence to form an RC filter circuit, the first capacitor, the fourth resistor, the fifth resistor, and the sixth resistor are sequentially connected to the positive input terminal of the operational amplifier through the lines, and the common terminal composed of the fifth resistor and the sixth resistor is connected to the first The common terminal formed by the three resistors and the ninth resistor, the other end of the first capacitor is grounded, the inverting input terminal of the operational amplifier is connected to its output terminal, and the output terminal of the operational amplifier is connected to the positive terminal of the detection voltage;
第七二极管的负极和第五二极管的正极连接，第五二极管的负极连接至第三电阻和第九电阻组成的公共端，第七二极管的正极接-10V；第八二极管的正极和第六二极管的负极连接，第六二极管的正极连接至第三电阻和第九电阻组成的公共端，第八二极管的负极接+10V；第七二极管的负极和第五二极管的正极组成的公共端与第八二极管的正极和第六二极管的负极组成的公共端连接；The cathode of the seventh diode is connected to the anode of the fifth diode, the cathode of the fifth diode is connected to the common end formed by the third resistor and the ninth resistor, and the anode of the seventh diode is connected to -10V; The anode of the eighth diode is connected to the cathode of the sixth diode, the anode of the sixth diode is connected to the common end formed by the third resistor and the ninth resistor, and the cathode of the eighth diode is connected to +10V; the seventh The common end formed by the cathode of the diode and the anode of the fifth diode is connected to the common end formed by the anode of the eighth diode and the cathode of the sixth diode;
第四二极管的负极和第二二极管的正极连接，第二二极管的负极连接至电感的另一端，第四二极管的正极接-47V；第三二极管的正极和第一二极管的负极连接，第一二极管的正极连接至电感的另一端，第三二极管的负极接+47V；第四二极管的负极和第二二极管的正极组成公共端与第三二极管的正极和第一二极管的负极组成的公共端连接；The cathode of the fourth diode is connected to the anode of the second diode, the cathode of the second diode is connected to the other end of the inductor, and the anode of the fourth diode is connected to -47V; the anode of the third diode is connected to The cathode of the first diode is connected, the anode of the first diode is connected to the other end of the inductor, the cathode of the third diode is connected to +47V; the cathode of the fourth diode is composed of the anode of the second diode The common end is connected to the common end formed by the anode of the third diode and the cathode of the first diode;
第七电阻的一端连接至运算放大器的输出端，另一端分别与第二电阻、第八电阻、第二电容相连接，第八电阻的另一端连接至第八二极管的正极和第六二极管的负极组成的公共端；第二电阻的另一端与第一电阻连接，第一电阻的另一端连接至第四二极管的负极和第二二极管的正极组成公共端；第二电容的另一端接地。One end of the seventh resistor is connected to the output terminal of the operational amplifier, and the other end is connected to the second resistor, the eighth resistor, and the second capacitor respectively, and the other end of the eighth resistor is connected to the anode of the eighth diode and the sixth and second capacitors. The common end formed by the cathode of the pole tube; the other end of the second resistor is connected to the first resistor, the other end of the first resistor is connected to the cathode of the fourth diode and the anode of the second diode forms a common end; the second The other end of the capacitor is grounded.
优选地，运算放大器采用N55。Preferably, the operational amplifier adopts N55.
优选地，电感采用L74。Preferably, the inductance is L74.
此外，本发明还提到一种电流检测单元漏电流消除方法，该方法采用如上所述的一种电流检测单元漏电流消除电路，包括如下步骤：In addition, the present invention also mentions a current detection unit leakage current elimination method, the method adopts the above-mentioned current detection unit leakage current elimination circuit, including the following steps:
步骤1：将第八二极管的正极和第六二极管的负极组成的公共端点设置为A点；Step 1: Set the common terminal formed by the anode of the eighth diode and the cathode of the sixth diode as point A;
步骤2：将第三电阻和第九电阻组成的公共端点设置为B点；Step 2: Set the common terminal formed by the third resistor and the ninth resistor as point B;
步骤3：通过运算放大器将B点电位跟随到A点；Step 3: follow the potential of point B to point A through the operational amplifier;
步骤4：PCB布局时，从A点引出一个金属环将检测电路保护起来，使检测电路与附近电路相隔离；Step 4: During PCB layout, lead a metal ring from point A to protect the detection circuit and isolate the detection circuit from nearby circuits;
步骤5：消除漏电流。Step 5: Eliminate leakage current.
本发明所带来的有益技术效果：Beneficial technical effects brought by the present invention:
本发明提出了一种电流检测单元漏电流消除电路及消除方法，与现有技术相比，本发明应用精确、低噪声以及低偏置电流的运算放大器跟随检测信号电压电路构成一个等电位保护电路，产生等电位低阻抗输出作为保护信号，在PCB布局时将高阻抗的信号检测通路加了一个金属保护环，实现了检测通路与附近电路的隔离保护，降低了外部电路的干扰，避免了由于检测通路与附近电路电位差引起的泄漏电流，达到了电流检测单元漏电流消除目的，提高了弱电流检测准确度，充分利用PCB空间；该电路能够准确实现弱电流到电压的转换，完成电流检测功能，而且电路结构简单，成本低廉；在电流检测等相关测量领域中具有良好的应用价值。The present invention proposes a current detection unit leakage current elimination circuit and elimination method. Compared with the prior art, the present invention uses an operational amplifier with precision, low noise and low bias current to follow the detection signal voltage circuit to form an equipotential protection circuit , to generate an equipotential low impedance output as a protection signal. A metal protection ring is added to the high impedance signal detection path in the PCB layout, which realizes the isolation protection between the detection path and the nearby circuit, reduces the interference of the external circuit, and avoids the The leakage current caused by the potential difference between the detection path and the nearby circuit achieves the purpose of eliminating the leakage current of the current detection unit, improves the detection accuracy of the weak current, and makes full use of the PCB space; the circuit can accurately realize the conversion from the weak current to the voltage, and complete the current detection function, and the circuit structure is simple and low cost; it has good application value in related measurement fields such as current detection.
附图说明Description of drawings
图1为本发明一种电流检测单元漏电流消除电路的电路原理图。FIG. 1 is a schematic circuit diagram of a leakage current elimination circuit of a current detection unit according to the present invention.
具体实施方式detailed description
下面结合附图以及具体实施方式对本发明作进一步详细说明：Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:
实施例1：Example 1:
如图1所示的一种电流检测单元漏电流消除电路，包括电阻、电容、电感、二极管以及运算放大器；A current detection unit leakage current elimination circuit as shown in Figure 1, including a resistor, a capacitor, an inductor, a diode and an operational amplifier;
所述电阻包括第一电阻R216、第二电阻R217、第三电阻R222、第四电阻R223、第五电阻R224、第六电阻R225、第七电阻R226、第八电阻R227、第九电阻R239、第十电阻R240以及第十一电阻R701；The resistors include a first resistor R216, a second resistor R217, a third resistor R222, a fourth resistor R223, a fifth resistor R224, a sixth resistor R225, a seventh resistor R226, an eighth resistor R227, a ninth resistor R239, a Ten resistors R240 and eleventh resistors R701;
所述电容包括第一电容C170、第二电容C223以及第三电容C229；The capacitors include a first capacitor C170, a second capacitor C223 and a third capacitor C229;
所述二极管包括第一二极管V82、第二二极管V83、第三二极管V84、第四二极管V85、第五二极管V90、第六二极管V91、第七二极管V92以及第八二极管V93；The diodes include a first diode V82, a second diode V83, a third diode V84, a fourth diode V85, a fifth diode V90, a sixth diode V91, and a seventh diode Tube V92 and eighth diode V93;
第九电阻R239和第十电阻R240通过线路连接组成检测电阻；第十电阻R240、第九电阻R239、第三电阻R222和电感L74通过线路依次连接组成检测电路；第九电阻R239的另一端和第十电阻R240的另一端分别连接至第三电容C229的两端，第十一电阻R701的一端连接至第十电阻R240和第三电容C229组成的公共端，另一端与检测电压的负极端口连接；第一电容C170、第四电阻R223和第五电阻R224通过线路依次连接组成RC滤波电路，第一电容C170、第四电阻R223、第五电阻R224、第六电阻R225通过线路依次连接至运算放大器N55的正向输入端，第五电阻R224和第六电阻R225组成的公共端连接至第三电阻R222和第九电阻R239组成的公共端，第一电容C170的另一端接地，运算放大器N55的反向输入端和其输出端相连接，运算放大器N55的输出端与检测电压的正极端口连接；The ninth resistor R239 and the tenth resistor R240 are connected through a line to form a detection resistor; the tenth resistor R240, the ninth resistor R239, the third resistor R222 and the inductance L74 are sequentially connected through a line to form a detection circuit; the other end of the ninth resistor R239 and the The other end of the tenth resistor R240 is respectively connected to both ends of the third capacitor C229, one end of the eleventh resistor R701 is connected to the common end formed by the tenth resistor R240 and the third capacitor C229, and the other end is connected to the negative terminal of the detection voltage; The first capacitor C170, the fourth resistor R223, and the fifth resistor R224 are sequentially connected through lines to form an RC filter circuit, and the first capacitor C170, the fourth resistor R223, the fifth resistor R224, and the sixth resistor R225 are sequentially connected to the operational amplifier N55 through lines The positive input end of the fifth resistor R224 and the sixth resistor R225 are connected to the common end formed by the third resistor R222 and the ninth resistor R239, the other end of the first capacitor C170 is grounded, and the reverse of the operational amplifier N55 The input terminal is connected to its output terminal, and the output terminal of the operational amplifier N55 is connected to the positive terminal of the detection voltage;
第七二极管V92的负极和第五二极管V90的正极连接，第五二极管V90的负极连接至第三电阻R222和第九电阻R239组成的公共端，第七二极管V92的正极接-10V；第八二极管V93的正极和第六二极管V91的负极连接，第六二极管V91的正极连接至第三电阻R222和第九电阻R239组成的公共端，第八二极管V93的负极接+10V；第七二极管V92的负极和第五二极管V90的正极组成的公共端与第八二极管V93的正极和第六二极管V91的负极组成的公共端连接；The cathode of the seventh diode V92 is connected to the anode of the fifth diode V90, the cathode of the fifth diode V90 is connected to the common end formed by the third resistor R222 and the ninth resistor R239, and the seventh diode V92 The anode is connected to -10V; the anode of the eighth diode V93 is connected to the cathode of the sixth diode V91, and the anode of the sixth diode V91 is connected to the common terminal composed of the third resistor R222 and the ninth resistor R239, and the eighth The cathode of the diode V93 is connected to +10V; the common terminal formed by the cathode of the seventh diode V92 and the anode of the fifth diode V90 is composed of the anode of the eighth diode V93 and the cathode of the sixth diode V91 public end connection;
第四二极管V85的负极和第二二极管V83的正极连接，第二二极管V83的负极连接至电感L74的另一端，第四二极管V85的正极接-47V；第三二极管V84的正极和第一二极管V82的负极连接，第一二极管V82的正极连接至电感L74的另一端，第三二极管V84的负极接+47V；第四二极管V85的负极和第二二极管V83的正极组成公共端与第三二极管V84的正极和第一二极管V82的负极组成的公共端连接；The cathode of the fourth diode V85 is connected to the anode of the second diode V83, the cathode of the second diode V83 is connected to the other end of the inductor L74, and the anode of the fourth diode V85 is connected to -47V; The anode of the pole tube V84 is connected to the cathode of the first diode V82, the anode of the first diode V82 is connected to the other end of the inductor L74, the cathode of the third diode V84 is connected to +47V; the fourth diode V85 The negative pole of the second diode V83 and the positive pole of the second diode V83 form a common terminal, which is connected to the common terminal formed by the positive pole of the third diode V84 and the negative pole of the first diode V82;
第七电阻R226的一端连接至运算放大器N55的输出端，另一端分别与第二电阻R217、第八电阻R227、第二电容C223相连接，第八电阻R227的另一端连接至第八二极管V93的正极和第六二极管V91的负极组成的公共端；第二电阻R217的另一端与第一电阻R216连接，第一电阻R216的另一端连接至第四二极管V85的负极和第二二极管V83的正极组成公共端；第二电容C223的另一端接地。One end of the seventh resistor R226 is connected to the output end of the operational amplifier N55, the other end is respectively connected to the second resistor R217, the eighth resistor R227, and the second capacitor C223, and the other end of the eighth resistor R227 is connected to the eighth diode The common end formed by the anode of V93 and the cathode of the sixth diode V91; the other end of the second resistor R217 is connected to the first resistor R216, and the other end of the first resistor R216 is connected to the cathode of the fourth diode V85 and the first resistor R216 The anodes of the two diodes V83 form a common terminal; the other terminal of the second capacitor C223 is grounded.
实施例2：Example 2:
在上述实施例的基础上，本发明还提到一种电流检测单元漏电流消除方法，用于消除电流检测单元的漏电流，包括如下步骤：On the basis of the above embodiments, the present invention also mentions a method for eliminating the leakage current of the current detection unit, which is used to eliminate the leakage current of the current detection unit, including the following steps:
步骤1：将第八二极管的正极和第六二极管的负极组成的公共端点设置为A点；Step 1: Set the common terminal formed by the anode of the eighth diode and the cathode of the sixth diode as point A;
步骤2：将第三电阻和第九电阻组成的公共端点设置为B点；Step 2: Set the common terminal formed by the third resistor and the ninth resistor as point B;
步骤3：通过运算放大器将B点电位跟随到A点；Step 3: follow the potential of point B to point A through the operational amplifier;
步骤4：PCB布局时，从A点引出一个金属环将检测电路保护起来，使检测电路与附近电路相隔离；Step 4: During PCB layout, lead a metal ring from point A to protect the detection circuit and isolate the detection circuit from nearby circuits;
步骤5：消除漏电流。Step 5: Eliminate leakage current.
假设图1中B点的电位为V，假定周围相邻电路绝缘材料的电阻为R，相邻电路的电位为Vn，可以得出泄漏电流：Assuming that the potential at point B in Figure 1 is V, assuming that the resistance of the insulating material of the surrounding adjacent circuits is R, and the potential of the adjacent circuits is Vn, the leakage current can be obtained:
Ileak＝(V-Vn)/RI leak ＝(V-Vn)/R
传统电流测量技术中，V和Vn存在一定的电位差，由上面公式可知减小Ileak的方法只能为加大R阻值。然而R的阻值不可能无限的增大，所以泄漏电流不能根本消除。本发明中通过运算放大器N55将B点的电位跟随到A点，从A点引出一个金属环将检测电路保护起来，这样的话Vn的电位就无限接近于V，V-Vn电位差为零，泄漏电流Ileak就会基本等于0，达到消除漏电流目的。In traditional current measurement technology, there is a certain potential difference between V and Vn. From the above formula, it can be seen that the only way to reduce I leak is to increase the resistance of R. However, the resistance value of R cannot be increased infinitely, so the leakage current cannot be eliminated fundamentally. In the present invention, the potential of point B is followed to point A through the operational amplifier N55, and a metal ring is drawn from point A to protect the detection circuit. In this way, the potential of Vn is infinitely close to V, and the potential difference between V-Vn is zero, preventing leakage. The current Ileak will be basically equal to 0 to achieve the purpose of eliminating the leakage current.
本发明应用精确、低噪声以及低偏置电流的运算放大器跟随检测电压电路构成一个等电位保护电路，产生等电位低阻抗输出作为保护信号，在PCB布局时将高阻抗的信号检测通路加了一个金属保护环，由于采用有源驱动电路，用导电材料将与信号线等电位的保护信号包围电流检测单元信号线，构建一个低阻抗的“法拉第笼”，可显著降低外部电路的干扰，使信号线与外部电路实现良好隔离，从而达到电流检测单元漏电流消除目的。The invention uses an operational amplifier with precision, low noise and low bias current to follow the detection voltage circuit to form an equipotential protection circuit, which generates an equipotential low impedance output as a protection signal, and adds a high impedance signal detection path to the PCB layout. The metal protection ring, because of the active drive circuit, uses a conductive material to surround the signal line of the current detection unit with a protection signal at the same potential as the signal line, and builds a low-impedance "Faraday cage", which can significantly reduce the interference of the external circuit and make the signal The line is well isolated from the external circuit, so as to achieve the purpose of eliminating the leakage current of the current detection unit.
本发明强制给电流检测单元加了一个金属保护环，避免了由于测量电路与附近电路电位差引起的泄漏电流，充分利用PCB空间；该电路能够准确实现弱电流到电压的转换，完成电流检测功能，而且电路结构简单，成本低廉。因此，本发明在电流检测等相关测量领域中具有良好的应用价值。The invention compulsorily adds a metal protection ring to the current detection unit, which avoids the leakage current caused by the potential difference between the measurement circuit and the nearby circuit, and makes full use of the PCB space; the circuit can accurately realize the conversion from weak current to voltage, and complete the current detection function , and the circuit structure is simple and the cost is low. Therefore, the present invention has good application value in related measurement fields such as current detection.
当然，上述说明并非是对本发明的限制，本发明也并不仅限于上述举例，本技术领域的技术人员在本发明的实质范围内所做出的变化、改型、添加或替换，也应属于本发明的保护范围。Of course, the above descriptions are not intended to limit the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or replacements made by those skilled in the art within the scope of the present invention shall also belong to the present invention. protection scope of the invention.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610633601.5A CN106291032B (en) | 2016-08-04 | 2016-08-04 | A kind of current detecting unit leakage current eliminates circuit and removing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610633601.5A CN106291032B (en) | 2016-08-04 | 2016-08-04 | A kind of current detecting unit leakage current eliminates circuit and removing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106291032A true CN106291032A (en) | 2017-01-04 |
| CN106291032B CN106291032B (en) | 2019-03-26 |
Family
ID=57664933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610633601.5A Active CN106291032B (en) | 2016-08-04 | 2016-08-04 | A kind of current detecting unit leakage current eliminates circuit and removing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106291032B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110850143A (en) * | 2019-10-25 | 2020-02-28 | 天津航空机电有限公司 | Multi-voltage acquisition and fault detection circuit for eliminating floating voltage |
| CN113848366A (en) * | 2021-08-10 | 2021-12-28 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001183397A (en) * | 1999-12-24 | 2001-07-06 | Toyo Commun Equip Co Ltd | Level measuring method using digital filter |
| CN101013143A (en) * | 2006-12-21 | 2007-08-08 | 武汉天任光电互感器有限公司 | Highly anti-interference alternating-current/magnetic field sensor |
| US20120229142A1 (en) * | 2011-03-10 | 2012-09-13 | Samsung Sdi Co., Ltd | Apparatus for detecting leakage current of battery |
| CN202870229U (en) * | 2012-10-09 | 2013-04-10 | 浙江埃菲生能源科技有限公司 | Leakage current detection and protection circuit |
| CN103795029A (en) * | 2013-08-20 | 2014-05-14 | 深圳市金霆科技有限公司 | Leakage current detection protection circuit of direct-current remote supply power system |
| CN104345201A (en) * | 2013-08-09 | 2015-02-11 | 华为技术有限公司 | Leakage current detection method and device |
| CN105262052A (en) * | 2015-12-01 | 2016-01-20 | 商晓 | Intelligent motor protector without external power source |
| US20160056809A1 (en) * | 2014-08-21 | 2016-02-25 | International Business Machines Corporation | Leakage current reduction in stacked field-effect transistors |
| CN205123234U (en) * | 2015-12-01 | 2016-03-30 | 商晓 | No external power supply type motor protector of intelligence |
-
2016
- 2016-08-04 CN CN201610633601.5A patent/CN106291032B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001183397A (en) * | 1999-12-24 | 2001-07-06 | Toyo Commun Equip Co Ltd | Level measuring method using digital filter |
| CN101013143A (en) * | 2006-12-21 | 2007-08-08 | 武汉天任光电互感器有限公司 | Highly anti-interference alternating-current/magnetic field sensor |
| US20120229142A1 (en) * | 2011-03-10 | 2012-09-13 | Samsung Sdi Co., Ltd | Apparatus for detecting leakage current of battery |
| CN202870229U (en) * | 2012-10-09 | 2013-04-10 | 浙江埃菲生能源科技有限公司 | Leakage current detection and protection circuit |
| CN104345201A (en) * | 2013-08-09 | 2015-02-11 | 华为技术有限公司 | Leakage current detection method and device |
| CN103795029A (en) * | 2013-08-20 | 2014-05-14 | 深圳市金霆科技有限公司 | Leakage current detection protection circuit of direct-current remote supply power system |
| US20160056809A1 (en) * | 2014-08-21 | 2016-02-25 | International Business Machines Corporation | Leakage current reduction in stacked field-effect transistors |
| CN105262052A (en) * | 2015-12-01 | 2016-01-20 | 商晓 | Intelligent motor protector without external power source |
| CN205123234U (en) * | 2015-12-01 | 2016-03-30 | 商晓 | No external power supply type motor protector of intelligence |
Non-Patent Citations (1)
| Title |
|---|
| 姚秋霞等: "VVVF控制电梯中的漏电流和高次谐波问题及解决对策", 《控制技术》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110850143A (en) * | 2019-10-25 | 2020-02-28 | 天津航空机电有限公司 | Multi-voltage acquisition and fault detection circuit for eliminating floating voltage |
| CN110850143B (en) * | 2019-10-25 | 2021-12-03 | 天津航空机电有限公司 | Multi-voltage acquisition and fault detection circuit for eliminating floating voltage |
| CN113848366A (en) * | 2021-08-10 | 2021-12-28 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
| CN113848366B (en) * | 2021-08-10 | 2023-07-18 | 广东朝阳电子科技股份有限公司 | Shutdown leakage current detection circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106291032B (en) | 2019-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10528187B2 (en) | Sensing circuit and touch sensor including the same | |
| CN105259528A (en) | Internal calibration circuit of microwave power probe and calibration method | |
| CN106199143A (en) | Micro-current detecting system in dielectric insulation diagnosis | |
| US11300536B1 (en) | Non-contact liquid sensing technologies | |
| CN106443128A (en) | FA-level weak current signal measurement circuit | |
| CN214750535U (en) | Current segmentation sampling system | |
| CN104880597A (en) | Programmable logic circuit based weak signal detection method | |
| CN106291032A (en) | A kind of current detecting unit leakage current eliminates circuit and removing method | |
| CN106788327B (en) | Sensor circuit for both contact and non-contact detection | |
| CN113504499A (en) | Error calibration device and method for differential measurement type voltage transformer | |
| US12130319B2 (en) | Electrostatic charge sensor with high impedance contact pads | |
| CN115494276A (en) | Current accurate measurement method based on simulation conditioning technology | |
| CN105510674A (en) | Microcurrent measuring circuit | |
| CN110412485A (en) | An output current detection circuit | |
| CN101932189B (en) | Measuring equipment and amplifying circuit, impedance component and multilayer printed circuit board thereof | |
| CN205484500U (en) | Portable current measurement circuit that declines | |
| CN111141965B (en) | Electrostatic field measuring circuit using field effect transistor | |
| CN103293386B (en) | Device and method for testing insulation resistance | |
| CN101932191B (en) | Measuring equipment and amplifying circuit, impedance component and multilayer printed circuit board thereof | |
| CN105137162A (en) | pA current detector | |
| JPS6114576A (en) | Alternating current voltage detector | |
| CN204789968U (en) | Signal measurement device of industrial safety in -line meter check gauge calibration usefulness | |
| CN204203329U (en) | Insulator leakage current sensor | |
| CN102904575A (en) | Analog to digital converter (ADC) front-end circuit and method for measuring resistance through ADC front-end circuit | |
| US20250035679A1 (en) | Active probe for measuring voltage at high impedances |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |