A signal conditioning circuit for an electric field monitoring sensor

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By designing a cascaded amplification unit and a power supply module, the problem of insufficient sensitivity in the signal processing circuit of the electric field sensor is solved, achieving efficient amplification of weak electric field signals, which is suitable for online system testing and miniaturized design.

CN224538168UActive Publication Date: 2026-07-21CHAOYANG JIAHUA ELECTRONICS

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Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: CHAOYANG JIAHUA ELECTRONICS
Filing Date: 2025-08-20
Publication Date: 2026-07-21

AI Technical Summary

Technical Problem

Existing electric field sensors have low electric field detection sensitivity in signal processing circuits during near-field measurements, making it difficult to meet the electromagnetic compatibility requirements for high sensitivity.

Method used

The first, second, and third amplification units are cascaded together, combined with a power supply module and a voltage conversion unit, to improve the amplification effect of the electric field signal through three-stage amplification.

Benefits of technology

It significantly improves the sensitivity of electric field detection, meets the amplification requirements of weak electric field signals, and is suitable for online system testing and miniaturized design.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a signal conditioning circuit of an electric field monitoring sensor, relates to the field of electric field monitoring sensor signal conditioning, and comprises a power supply module and an amplification module. The amplification module comprises a first amplification unit, a second amplification unit and a third amplification unit which are connected in cascade. The first amplification unit is used for amplifying an original electric field signal, outputting a first amplified electric field signal, and transmitting the first amplified electric field signal to the second amplification unit. The second amplification unit is used for amplifying the first amplified electric field signal, outputting a second amplified electric field signal, and transmitting the second amplified electric field signal to the third amplification unit. The third amplification unit is used for amplifying the second amplified electric field signal, outputting a final amplified electric field signal. The application amplifies a weak electric field signal based on the three amplification units in cascade, and improves electric field detection sensitivity.

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Description

Technical Field

[0001] This application relates to the field of signal conditioning for electric field monitoring sensors, and in particular to a signal conditioning circuit for an electric field monitoring sensor. Background Technology

[0002] With the increasing automation of J-ships, a large number of their electronic devices are used for communication, navigation, monitoring, diagnosis, and control, greatly improving the safety and operational efficiency of J-ship transportation. However, at the same time, various human and natural electromagnetic activities are highly concentrated, intertwined, and overlapping in certain time, spatial, and frequency domains, bringing about complex electromagnetic compatibility issues. Therefore, electric field sensors are needed to sense spatial radiated interference signals. Non-contact methods are mainly used for measuring radiated interference. In near-field measurements, the current electric field sensor signal processing circuits have low electric field detection sensitivity, necessitating a signal conditioning circuit for an electric field monitoring sensor with high electric field detection sensitivity. Utility Model Content

[0003] The purpose of this application is to provide a signal conditioning circuit for an electric field monitoring sensor, which can improve the sensitivity of electric field detection.

[0004] To achieve the above objectives, this application provides the following solution:

[0005] This application provides a signal conditioning circuit for an electric field monitoring sensor, including a power supply module and an amplification module; the amplification module includes a first amplification unit, a second amplification unit, and a third amplification unit connected in cascade.

[0006] The first amplification unit is used to amplify the original electric field signal, output a first amplified electric field signal, and transmit the first amplified electric field signal to the second amplification unit;

[0007] The second amplification unit is used to amplify the first amplified electric field signal, output a second amplified electric field signal, and transmit the second amplified electric field signal to the third amplification unit;

[0008] The third amplification unit is used to amplify the second amplified electric field signal and output the final amplified electric field signal.

[0009] Optionally, the first amplification unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode, and a first operational amplifier; the two ends of the first resistor are respectively connected to one end of the second resistor and ground, the other end of the second resistor is connected to the output terminal of the first operational amplifier, one end of the third resistor is connected to one end of the fourth resistor, the other end of the third resistor is connected to the connection point between the first resistor and ground, the other end of the fourth resistor is connected to the connection point between the positive input terminal of the first operational amplifier and one end of the fifth resistor, and the other end of the fifth resistor is connected to the antenna of the electric field monitoring sensor;

[0010] The negative input terminal of the first operational amplifier is connected to the junction between the first resistor and the second resistor; the anode of the first diode is connected to the cathode of the second diode, the cathode of the first diode is connected to the junction between the positive power supply terminal and the target voltage terminal of the first operational amplifier, and the anode of the second diode is connected to the junction between the negative power supply terminal and the reference voltage terminal of the first operational amplifier; the output terminal of the first operational amplifier is the output terminal of the first amplification unit.

[0011] Optionally, the second amplification unit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a second operational amplifier; one end of the sixth resistor is grounded, the other end of the sixth resistor is connected to one end of the seventh resistor, and the other end of the seventh resistor is connected to the output terminal of the second operational amplifier; one end of the eighth resistor is connected to the connection point between the second resistor and the output terminal of the first operational amplifier, and the other end of the eighth resistor is connected to the positive input terminal of the second operational amplifier, and the negative input terminal of the second operational amplifier is connected to the connection point between the sixth and seventh resistors; one end of the ninth resistor is connected to one end of the tenth resistor, the other end of the ninth resistor is connected to the connection point between the positive power supply terminal and the target voltage terminal of the second operational amplifier, and the other end of the tenth resistor is connected to the connection point between the negative power supply terminal and the reference voltage terminal of the second operational amplifier; the output terminal of the second operational amplifier is the output terminal of the second amplification unit.

[0012] Optionally, the third amplification unit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a third diode, a fourth diode, and a third operational amplifier;

[0013] One end of the eleventh resistor is connected to the connection point between the seventh resistor and the output terminal of the second operational amplifier, and the other end of the eleventh resistor is connected to the positive input terminal of the third operational amplifier; one end of the twelfth resistor is grounded, and the other end of the twelfth resistor is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the output terminal of the third operational amplifier; the negative input terminal of the third operational amplifier is connected to the connection point between the twelfth and thirteenth resistors; one end of the fourteenth resistor and one end of the fifteenth resistor are connected to the connection point between the eleventh resistor and the positive input terminal of the third operational amplifier, and the other end of the fourteenth resistor is connected to the connection point between the positive power supply terminal and the target voltage terminal of the third operational amplifier, and the other end of the fifteenth resistor is connected to the connection point between the negative power supply terminal and the reference voltage terminal of the third operational amplifier; the anode of the third diode is connected to the cathode of the fourth diode, the cathode of the third diode is connected to the connection point between the positive power supply terminal and the target voltage terminal of the third operational amplifier, and the anode of the fourth diode is connected to the connection point between the negative power supply terminal and the reference voltage terminal of the third operational amplifier; one end of the sixteenth resistor is connected to the connection point between the thirteenth resistor and the output terminal of the third operational amplifier, and the other end of the sixteenth resistor is the output terminal of the third amplification unit.

[0014] Optionally, the first operational amplifier, the second operational amplifier, and the third operational amplifier are SGM8051 high-speed operational amplifiers.

[0015] Optionally, the power module includes a socket, a fifth diode, a sixth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first inductor, a second inductor, and a Zener diode; the positive terminal of the fifth diode is connected to the first interface of the socket, the negative terminal of the fifth diode is connected to one end of the second capacitor, the negative terminal of the sixth diode, and one end of the first inductor, the other end of the first inductor is connected to one end of the third capacitor, one end of the fourth capacitor, and the input terminal of the Zener diode; the second interface of the socket is connected to the other end of the second capacitor, the positive terminal of the sixth diode, and one end of the second inductor, the other end of the second inductor is connected to the other end of the third capacitor, the other end of the fourth capacitor, the ground terminal of the Zener diode, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, and one end of the first capacitor; the ground terminal of the Zener diode is grounded; the output terminal of the Zener diode is connected to the other end of the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, and the first capacitor, as well as the target voltage terminal; the third interface of the socket is connected to the sixteenth resistor as one end of the output terminal of the third amplification unit; the fourth interface of the socket is grounded.

[0016] Optionally, the Zener diode is an AMS1117 Zener diode.

[0017] Optionally, the sixth diode is a transient voltage suppressor diode.

[0018] Optionally, the signal conditioning circuit of the electric field monitoring sensor further includes a voltage conversion unit; the voltage conversion unit includes a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a voltage converter, and a third inductor; one end of the ninth capacitor is grounded, and the other end of the ninth capacitor is connected to the connection point between the target voltage terminal and the V+ pin of the voltage converter; one end of the tenth capacitor is connected to the C+ pin of the voltage converter, and the other end of the tenth capacitor is connected to the C- pin of the voltage converter; the GND pin of the voltage converter is grounded, the LV pin of the voltage converter is connected to ground and one end of the twelfth, eleventh, thirteenth, and fourteenth capacitors, the VO pin of the voltage converter is connected to the twelfth capacitor and one end of the third inductor, the other end of the third inductor is connected to the other ends of the eleventh, thirteenth, and fourteenth capacitors, and the other end of the fourteenth capacitor outputs a reference voltage.

[0019] According to the specific embodiments provided in this application, the following technical effects are disclosed:

[0020] This application provides a signal conditioning circuit for an electric field monitoring sensor. The signal conditioning circuit includes a power supply module and an amplification module. The amplification module includes a first amplification unit, a second amplification unit, and a third amplification unit connected in cascade. The first amplification unit amplifies the original electric field signal, outputs a first amplified electric field signal, and transmits the first amplified electric field signal to the second amplification unit. The second amplification unit amplifies the first amplified electric field signal, outputs a second amplified electric field signal, and transmits the second amplified electric field signal to the third amplification unit. The third amplification unit amplifies the second amplified electric field signal and outputs a final amplified electric field signal. This application amplifies weak electric field signals based on three cascaded amplification units, thereby improving the sensitivity of electric field detection. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a structural diagram of a signal conditioning circuit for an electric field monitoring sensor provided in Embodiment 1 of this application.

[0023] Figure 2 This is a schematic diagram of the specific structure of the signal conditioning circuit of an electric field monitoring sensor provided in Embodiment 1 of this application.

[0024] Figure 3This is a schematic diagram of the voltage conversion unit provided in Embodiment 1 of this application.

[0025] Figure 4 This is a schematic diagram of the operating state circuit provided in Embodiment 1 of this application.

[0026] Figure 5 This is a schematic diagram of the electric field sensor provided in Embodiment 1 of this application.

[0027] Figure 6 This is a system block diagram for electric field verification provided in Embodiment 1 of this application. Detailed Implementation

[0028] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] Example 1.

[0031] like Figure 1 As shown, this embodiment provides a signal conditioning circuit for an electric field monitoring sensor, including a power supply module and an amplification module; the amplification module includes a first amplification unit, a second amplification unit, and a third amplification unit connected in cascade.

[0032] This embodiment uses the ES-II type electric field monitoring sensor as an example to specifically describe the signal conditioning circuit of the electric field monitoring sensor. The ES-II type electric field monitoring sensor can measure electric fields in the frequency range of 5kHz to 35MHz, and the electric field strength and dynamic range requirements are shown in Table 1 below.

[0033] Table 1 shows the monitorable electric field strength and dynamic range.

[0034] 1 10kHz B~G ≥50dB 2 100kHz B~G ≥50dB 3 1MHz B~G ≥50dB 4 3MHz B~G ≥50dB 5 10MHz A~E ≥40dB 6 30MHz A~E ≥40dB

[0035] The interface and electrical characteristics of the ES-II type electric field monitoring sensor are as follows: 1) Input voltage: +12VDC; 2) Power consumption: <1.5W; 3) Output impedance: 50Ω; 4) Connector: F104Z19K037-130 four-pin aviation connector. The ES-II type electric field monitoring sensor has dimensions <Φ130mm×120mm and a weight ≤2kg. The technical specifications of the ES-II type electric field monitoring sensor are: a) Frequency range: 5kHz~35MHz; b) Measurable electric field strength: B~G@5kHz~3MHz, dynamic range ≥50dB; A~E@10MHz~35MHz, dynamic range ≥40dB. The electric field monitoring sensor utilizes Faraday's law of electromagnetic induction to condition and convert the collected electromagnetic field signal into a signal recognizable by the user system (MCU / AD). A schematic diagram of the electric field monitoring sensor is shown below. Figure 5 As shown, the electric field signal of the EUT1 device under test enters the signal conditioning circuit through the sensing unit channel, obtains the final amplified signal, and is transmitted to the user system (MCU / AD) through the user interface.

[0036] The electric field monitoring sensor dynamically senses changes in electromagnetic signals in real time. The sensor nodes are plug-and-play, highly scalable, and can transmit sensed signal data securely in real time. Traditional methods for sensing electromagnetic environment signals rely on integrated foreign instruments, which suffer from drawbacks such as large size, high cost, limited scalability, and inconvenience for system-level testing. This solution adopts an embedded design concept, resulting in a system that meets the requirements of online testing, miniaturization, and complete domestic production.

[0037] To complement the characteristics of the electric field antenna and improve detection sensitivity, the ES-II electromagnetic field sensor's signal conditioning circuit employs a FET high input impedance design. The domestically produced SGM8051 is a monolithic high-input-impedance rail-to-rail high-speed broadband operational amplifier with pA-level input bias current. At gain 1 (first amplification unit), it has a bandwidth of 250MHz; at gain 2 (second amplification unit), it has a bandwidth of 180MHz; and at gain 3 (third amplification unit), it has a bandwidth of 37MHz. Cascading these three amplification units provides even higher gain, meeting design requirements.

[0038] In addition, to meet the operating frequency band requirements from 5kHz to 35MHz, a full DC amplifier design was adopted to ensure performance at the low frequency end.

[0039] The first amplification unit amplifies the original electric field signal, outputs a first amplified electric field signal, and transmits the first amplified electric field signal to the second amplification unit.

[0040] like Figure 2As shown, the first amplification unit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first diode D1, a second diode D2, and a first operational amplifier U1. The two ends of the first resistor R1 are connected to one end of the second resistor R2 and ground (GND), respectively. The other end of the second resistor R2 is connected to the output terminal (VO) of the first operational amplifier U1. One end of the third resistor R3 is connected to one end of the fourth resistor R4, and the other end of the third resistor R3 is connected to the connection point between the first resistor R1 and ground. The other end of the fourth resistor R4 is connected to the connection point between the positive input terminal IN+ of the first operational amplifier U1 and one end of the fifth resistor R5. The other end of R5 is connected to the antenna of the electric field monitoring sensor. The other end of the fifth resistor R5 can be connected to the antenna of the electric field monitoring sensor through the patch nut J1. The negative input terminal IN- of the first operational amplifier U1 is connected to the connection point between the first resistor R1 and the second resistor R2. The positive terminal of the first diode D1 is connected to the negative terminal of the second diode D2. The negative terminal of the first diode D1 is connected to the connection point between the positive power supply terminal (+VS) of the first operational amplifier U1 and the target voltage terminal VDD. The positive terminal of the second diode D2 is connected to the connection point between the negative power supply terminal (-VS) of the first operational amplifier U1 and the reference voltage terminal VSS. The output terminal of the first operational amplifier U1 is the output terminal of the first amplification unit.

[0041] The resistance values of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and the fifth resistor R5 are 1kΩ, 1kΩ, 100MΩ, 100MΩ, and 0, respectively.

[0042] The second amplification unit is used to amplify the first amplified electric field signal, output a second amplified electric field signal, and transmit the second amplified electric field signal to the third amplification unit.

[0043] The second amplification unit includes a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, and a second operational amplifier U2. One end of the sixth resistor R6 is grounded, and the other end of the sixth resistor R6 is connected to one end of the seventh resistor R7. The other end of the seventh resistor R7 is connected to the output terminal of the second operational amplifier U2. One end of the eighth resistor R8 is connected to the connection point between the second resistor R2 and the output terminal of the first operational amplifier U1, and the other end of the eighth resistor R8 is connected to the positive input terminal of the second operational amplifier U2. The negative input terminal of the second operational amplifier U2 is connected to the connection point between the sixth resistor R6 and the seventh resistor R7. One end of the ninth resistor R9 is connected to one end of the tenth resistor R10, and the other end of the ninth resistor R9 is connected to the connection point between the positive power supply terminal and the target voltage terminal VDD of the second operational amplifier U2. The other end of the tenth resistor R10 is connected to the connection point between the negative power supply terminal and the reference voltage terminal VSS of the second operational amplifier U2. The output terminal of the second operational amplifier U2 is the output terminal of the second amplification unit.

[0044] The resistance values of the sixth resistor R6, the seventh resistor R7, the eighth resistor R8, the ninth resistor R9, and the tenth resistor R10 are 1kΩ, 3.9kΩ, 1kΩ, 10kΩ, and 10kΩ, respectively.

[0045] The third amplification unit is used to amplify the second amplified electric field signal and output the final amplified electric field signal.

[0046] The third amplification unit includes eleventh resistor R11, twelfth resistor R12, thirteenth resistor R13, fourteenth resistor R14, fifteenth resistor R15, sixteenth resistor R16, third diode D3, fourth diode D5, and third operational amplifier U3;

[0047] One end of the eleventh resistor R11 is connected to the connection point between the seventh resistor R7 and the output terminal of the second operational amplifier U2; the other end of the eleventh resistor R11 is connected to the positive input terminal of the third operational amplifier U3. One end of the twelfth resistor R12 is grounded; the other end of the twelfth resistor R12 is connected to one end of the thirteenth resistor R13; the other end of the thirteenth resistor R13 is connected to the output terminal of the third operational amplifier U3. The negative input terminal of the third operational amplifier U3 is connected to the connection point between the twelfth resistor R12 and the thirteenth resistor R13. One end of the fourteenth resistor R14 and one end of the fifteenth resistor R15 are connected to the connection point between the eleventh resistor R11 and the positive input terminal of the third operational amplifier U3; the other end of the fourteenth resistor R14 is connected to the output terminal of the third operational amplifier U3. The connection point between the positive power supply terminal of amplifier U3 and the target voltage terminal VDD; the other end of the fifteenth resistor R15 is connected to the connection point between the negative power supply terminal of the third operational amplifier U3 and the reference voltage terminal VSS; the anode of the third diode D3 is connected to the cathode of the fourth diode D4, and the cathode of the third diode D3 is connected to the connection point between the positive power supply terminal of the third operational amplifier U3 and the target voltage terminal VDD; the anode of the fourth diode D4 is connected to the connection point between the negative power supply terminal of the third operational amplifier U3 and the reference voltage terminal VSS; one end of the sixteenth resistor R16 is connected to the connection point between the thirteenth resistor R13 and the output terminal of the third operational amplifier U3, and the other end of the sixteenth resistor R16 is the output terminal of the third amplification unit, thus obtaining the final electric field amplification signal.

[0048] The resistance values of the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14, the fifteenth resistor R15, and the sixteenth resistor R16 are 1kΩ, 1kΩ, 3.9kΩ, 10kΩ, 10kΩ, and 49.9Ω, respectively.

[0049] The first operational amplifier, the second operational amplifier, and the third operational amplifier are all SGM8051 high-speed operational amplifiers.

[0050] The voltage section employs a low-noise, low-dropout linear regulator to provide a reliable power supply to the signal conditioning circuit, and is equipped with input overvoltage and reverse connection protection, as well as a high-frequency filter. For example... Figure 2As shown, the power module includes socket J2, fifth diode D5, sixth diode D6, first capacitor C1, second capacitor C2, third capacitor C3, fourth capacitor C4, fifth capacitor C5, sixth capacitor C6, seventh capacitor C7, eighth capacitor C8, first inductor L1, second inductor L2, and Zener diode U4. The positive terminal of the fifth diode D5 is connected to the first interface of socket J2, and the negative terminal of the fifth diode D5 is connected to one end of the second capacitor C2, the negative terminal of the sixth diode D6, and one end of the first inductor L1. The other end of the first inductor L1 is connected to one end of the third capacitor C3, one end of the fourth capacitor C4, and the input terminal of the Zener diode U4. The second interface of socket J2 is connected to the second capacitor C2. The other end of the second inductor is connected to the positive terminal of the sixth diode D6, one end of the second inductor L2, the other end of the second inductor L2 is connected to the other end of the third capacitor C3, the other end of the fourth capacitor C4, the ground terminal GND / ADJ of the Zener diode U4, the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, and one end of the first capacitor C1; the ground terminal of the Zener diode U4 is grounded; the output terminal of the Zener diode U4 is connected to the other end of the fifth capacitor C5, the sixth capacitor C6, the seventh capacitor C7, the eighth capacitor C8, the first capacitor C1, and the target voltage terminal VDD; the third interface of the socket J2 is connected to the sixteenth resistor R16 as one end of the output terminal of the third amplification unit; the fourth interface of the socket J2 is grounded.

[0051] The fifth diode, D5, can be an M1F diode; the Zener diode, U4, is an AMS1117 Zener diode; and the sixth diode can be a transient voltage suppression diode (TVS diode). The socket J2 can be a (CON-JL29-4P) JL29 type socket.

[0052] The signal conditioning circuit of the electric field monitoring sensor also includes a voltage conversion unit; such as Figure 3As shown, the voltage conversion unit includes a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a voltage converter U5, and a third inductor L3. One end of the ninth capacitor C9 is grounded, and the other end of the ninth capacitor C9 is connected to the connection point between the target voltage terminal VDD and the V+ pin of the voltage converter U5. One end of the tenth capacitor C10 is connected to the C+ pin of the voltage converter U5, and the other end of the tenth capacitor C10 is connected to the C+ pin of the voltage converter U5. - Pin connections; The GND pin of voltage converter U5 is grounded, the LV pin of voltage converter U5 is connected to ground, and one end of the twelfth capacitor C12, the eleventh capacitor C11, the thirteenth capacitor C13, and the fourteenth capacitor C14. The VO pin of voltage converter U5 is connected to one end of the twelfth capacitor C12 and the third inductor L3. The other end of the third inductor L3 is connected to the other end of the eleventh capacitor C11, the thirteenth capacitor C13, and the fourteenth capacitor C14. The other end of the fourteenth capacitor C14 outputs the reference voltage VSS.

[0053] The first capacitor is 100nF. The second capacitor (C2), fourth capacitor (C4), sixth capacitor (C6), seventh capacitor (C7), and eighth capacitor (C8) are all 100nF, 10% capacity. The third capacitor (C3) and fifth capacitor (C5) are 10uF / 25V, 10% capacity. The eleventh capacitor (C11) is 1uF / 25V, 5% capacity. The ninth capacitor (C9), tenth capacitor (C10), twelfth capacitor (C12), thirteenth capacitor (C13), and fourteenth capacitor (C14) are 47uF / 10V, 47uF / 10V, 100nF, and 100nF respectively.

[0054] like Figure 4 As shown, the operating circuit includes a seventeenth capacitor R17 and a light-emitting diode LED1. One end of the seventeenth capacitor R17 is connected to the target voltage terminal, and the other end of the seventeenth capacitor R17 is connected to the positive terminal of the light-emitting diode LED1. The negative terminal of the light-emitting diode LED1 is grounded. If the light-emitting diode LED1 is lit, it indicates that the circuit is operating normally. The resistance of the seventeenth capacitor R17 is 1kΩ.

[0055] The ES-II type electric field monitoring sensor has the following functions: it can measure the electric field in the environment and verify its performance characteristics through simulation and actual testing. The electric field monitoring sensor has the following capabilities: a) It can monitor electric field strengths in the range of B to G within the frequency range of 5kHz to 3MHz, with a dynamic range ≥50dB; b) It can monitor electric field strengths in the range of A to E within the frequency range of 3MHz to 35MHz, with a dynamic range ≥40dB.

[0056] The system block diagram for electric field verification is as follows: Figure 6As shown, this system utilizes a TEM cell as an electric field generator to establish the required standard electric field inside the TEM cell. This standard field is then used to calibrate the frequency response and linearity characteristics of the electromagnetic environment monitoring components. The signal generated by the system's signal generator is amplified by a power amplifier and then connected to one end of the TEM cell. The other end of the TEM cell is connected to a matching load or attenuator. A second spectrum analyzer is used to monitor the forward power input into the TEM cell. Based on the forward power input into the TEM cell, the electric field strength of the uniform region inside the TEM cell can be roughly calculated using the formula relating the TEM cell's field strength to its power.

[0057] The signal conditioning circuit of the electric field monitoring sensor provided in this application can be combined with the characteristics of the electric field antenna to improve the detection sensitivity.

[0058] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0059] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A signal conditioning circuit for an electric field monitoring sensor, characterized in that, The signal conditioning circuit of the electric field monitoring sensor includes a power supply module and an amplification module; the amplification module includes a first amplification unit, a second amplification unit, and a third amplification unit connected in cascade. The first amplification unit is used to amplify the original electric field signal, output a first amplified electric field signal, and transmit the first amplified electric field signal to the second amplification unit; The second amplification unit is used to amplify the first amplified electric field signal, output a second amplified electric field signal, and transmit the second amplified electric field signal to the third amplification unit; The third amplification unit is used to amplify the second amplified electric field signal and output the final amplified electric field signal.

2. The signal conditioning circuit of the electric field monitoring sensor according to claim 1, characterized in that, The first amplification unit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first diode, a second diode, and a first operational amplifier; the two ends of the first resistor are respectively connected to one end of the second resistor and ground, the other end of the second resistor is connected to the output terminal of the first operational amplifier, one end of the third resistor is connected to one end of the fourth resistor, the other end of the third resistor is connected to the connection point between the first resistor and ground, the other end of the fourth resistor is connected to the connection point between the positive input terminal of the first operational amplifier and one end of the fifth resistor, and the other end of the fifth resistor is connected to the antenna of the electric field monitoring sensor; The negative input terminal of the first operational amplifier is connected to the junction between the first resistor and the second resistor; the anode of the first diode is connected to the cathode of the second diode, the cathode of the first diode is connected to the junction between the positive power supply terminal and the target voltage terminal of the first operational amplifier, and the anode of the second diode is connected to the junction between the negative power supply terminal and the reference voltage terminal of the first operational amplifier; the output terminal of the first operational amplifier is the output terminal of the first amplification unit.

3. The signal conditioning circuit of the electric field monitoring sensor according to claim 2, characterized in that, The second amplification unit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a tenth resistor, and a second operational amplifier. One end of the sixth resistor is grounded, and the other end of the sixth resistor is connected to one end of the seventh resistor, which is then connected to the output terminal of the second operational amplifier. One end of the eighth resistor is connected to the connection point between the second resistor and the output terminal of the first operational amplifier, and the other end of the eighth resistor is connected to the positive input terminal of the second operational amplifier. The negative input terminal of the second operational amplifier is connected to the connection point between the sixth and seventh resistors. One end of the ninth resistor is connected to one end of the tenth resistor, and the other end of the ninth resistor is connected to the connection point between the positive power supply terminal and the target voltage terminal of the second operational amplifier. The other end of the tenth resistor is connected to the connection point between the negative power supply terminal and the reference voltage terminal of the second operational amplifier. The output terminal of the second operational amplifier is the output terminal of the second amplification unit.

4. The signal conditioning circuit of the electric field monitoring sensor according to claim 3, characterized in that, The third amplification unit includes an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a third diode, a fourth diode, and a third operational amplifier; One end of the eleventh resistor is connected to the connection point between the seventh resistor and the output terminal of the second operational amplifier, and the other end of the eleventh resistor is connected to the positive input terminal of the third operational amplifier; one end of the twelfth resistor is grounded, and the other end of the twelfth resistor is connected to one end of the thirteenth resistor, and the other end of the thirteenth resistor is connected to the output terminal of the third operational amplifier; the negative input terminal of the third operational amplifier is connected to the connection point between the twelfth and thirteenth resistors; one end of the fourteenth resistor and one end of the fifteenth resistor are connected to the connection point between the eleventh resistor and the positive input terminal of the third operational amplifier, and the other end of the fourteenth resistor is connected to the connection point between the positive power supply terminal and the target voltage terminal of the third operational amplifier, and the other end of the fifteenth resistor is connected to the connection point between the negative power supply terminal and the reference voltage terminal of the third operational amplifier; the anode of the third diode is connected to the cathode of the fourth diode, the cathode of the third diode is connected to the connection point between the positive power supply terminal and the target voltage terminal of the third operational amplifier, and the anode of the fourth diode is connected to the connection point between the negative power supply terminal and the reference voltage terminal of the third operational amplifier; one end of the sixteenth resistor is connected to the connection point between the thirteenth resistor and the output terminal of the third operational amplifier, and the other end of the sixteenth resistor is the output terminal of the third amplification unit.

5. The signal conditioning circuit of the electric field monitoring sensor according to claim 4, characterized in that, The first operational amplifier, the second operational amplifier, and the third operational amplifier are SGM8051 high-speed operational amplifiers.

6. The signal conditioning circuit of the electric field monitoring sensor according to claim 4, characterized in that, The power module includes a socket, a fifth diode, a sixth diode, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, a first inductor, a second inductor, and a Zener diode. The positive terminal of the fifth diode is connected to the first interface of the socket, and the negative terminal of the fifth diode is connected to one end of the second capacitor, the negative terminal of the sixth diode, and one end of the first inductor. The other end of the first inductor is connected to one end of the third capacitor, one end of the fourth capacitor, and the input terminal of the Zener diode. The second interface of the socket is connected to the other end of the second capacitor, the positive terminal of the sixth diode, and one end of the second inductor. The other end of the second inductor is connected to the other end of the third capacitor, the other end of the fourth capacitor, the ground terminal of the Zener diode, the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, and one end of the first capacitor. The ground terminal of the Zener diode is grounded. The output terminal of the Zener diode is connected to the other end of the fifth capacitor, the sixth capacitor, the seventh capacitor, the eighth capacitor, and the first capacitor, as well as the target voltage terminal. The third interface of the socket is connected to the sixteenth resistor as one end of the output terminal of the third amplification unit. The fourth interface of the socket is grounded.

7. The signal conditioning circuit of the electric field monitoring sensor according to claim 6, characterized in that, The Zener diode is an AMS1117.

8. The signal conditioning circuit of the electric field monitoring sensor according to claim 6, characterized in that, The sixth diode is a transient voltage suppressor diode.

9. The signal conditioning circuit of the electric field monitoring sensor according to claim 1, characterized in that, The signal conditioning circuit of the electric field monitoring sensor further includes a voltage conversion unit; the voltage conversion unit includes a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, a voltage converter, and a third inductor; one end of the ninth capacitor is grounded, and the other end of the ninth capacitor is connected to the connection point between the target voltage terminal and the V+ pin of the voltage converter; one end of the tenth capacitor is connected to the C+ pin of the voltage converter, and the other end of the tenth capacitor is connected to the C- pin of the voltage converter; the GND pin of the voltage converter is grounded, the LV pin of the voltage converter is connected to ground, one end of the twelfth, eleventh, thirteenth, and fourteenth capacitors, the VO pin of the voltage converter is connected to the twelfth capacitor and one end of the third inductor, the other end of the third inductor is connected to the other ends of the eleventh, thirteenth, and fourteenth capacitors, and the other end of the fourteenth capacitor outputs a reference voltage.