Circuit based on flexible Rogowski coil
By combining signal amplification, biasing, comparison, excitation, and A/D conversion circuits, the problems of low acquisition accuracy and incomplete waveforms in flexible Rogowski coil acquisition circuits are solved, achieving efficient and accurate lightning current waveform acquisition and electrostatic interference shielding.
Patent Information
- Application Number
- CN202422666973.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-02
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-02
AI Technical Summary
Existing flexible Rogowski coil acquisition circuits suffer from low frequency and poor precision. Lightning current waveforms are in the microsecond range with large differences in peak value. The microcontroller's acquisition speed and precision cannot accurately capture the lightning current leader waveform, resulting in low acquisition accuracy, incomplete waveforms, and low efficiency and large errors in shielding non-surge signals.
By combining signal amplification circuits, signal bias circuits, signal comparison circuits, excitation signal circuits, A/D conversion circuits, microcontroller circuits, and communication circuits, and through the connection of specific chips and capacitors and resistors, signal enhancement and amplification, high-speed response, accurate capture, and shielding against electrostatic interference are achieved, ensuring stable acquisition by the microcontroller circuit.
It achieves accurate capture of lightning current waveforms and shields against electrostatic interference, improving acquisition accuracy and efficiency, ensuring waveform integrity and microcontroller stability, and reducing the risk of malfunction.
Smart Images
Figure CN223486058U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of data acquisition circuit technology, specifically to a flexible Rogowski coil circuit. Background Technology
[0002] Flexible Rogowski coil acquisition circuits are typically used to measure or detect the output signal of a flexible Rogowski coil. A flexible Rogowski coil is a flexible, bendable current sensor commonly used to measure the magnitude and waveform of current, especially in applications requiring high-frequency, high-current measurements. The design purpose of a flexible Rogowski coil acquisition circuit is to amplify, filter, and process the output signal of the flexible Rogowski coil through appropriate circuitry for subsequent data acquisition, analysis, or control. Such circuits typically include modules such as amplifiers, filters, and ADCs (analog-to-digital converters) to process the output signal of the flexible Rogowski coil and convert it into a digital signal or other form of output.
[0003] However, existing ADC acquisition circuits suffer from low frequency and poor accuracy. Lightning current waveforms are in the microsecond range with large peak value differences. The acquisition speed and accuracy of a single-chip microcomputer alone cannot produce significant errors. Furthermore, lightning is fast, and the response speed of a single-chip microcomputer cannot accurately capture the leading waveform of the lightning current, resulting in incomplete overall waveforms. Moreover, the circuit can only shield non-surge signals through single-chip microcomputer calculations, which is not only slow and inefficient but also prone to misjudgment due to large errors. This leads to low acquisition accuracy, incomplete waveform acquisition, and problems with malfunctions and poor shielding effects. Utility Model Content
[0004] The purpose of this invention is to provide a flexible Rogowski coil circuit that solves the aforementioned problems of existing data acquisition circuits.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a flexible Rogowski coil circuit, comprising a signal amplification circuit, a signal bias circuit electrically connected to the signal amplification circuit, a signal comparison circuit electrically connected to the signal bias circuit, an excitation signal circuit electrically connected to the signal comparison circuit, an A / D conversion circuit electrically connected to the signal amplification circuit, a microcontroller circuit electrically connected to both the A / D conversion circuit and the excitation signal circuit, and a communication circuit electrically connected to the microcontroller circuit.
[0006] Preferably, the signal amplification circuit includes a second chip, a seventh capacitor electrically connected to the second chip, a seventh resistor electrically connected to the second chip, an eleventh resistor electrically connected to the second chip, a third pin electrically connected to the eleventh resistor, a twelfth resistor electrically connected to the second chip, a sixth capacitor electrically connected to the twelfth resistor, and a third capacitor electrically connected to the second chip. Through the second chip operational amplifier with a 3140 core, the waveform signal can be amplified, resulting in stronger signal power and a larger amplitude, facilitating subsequent circuit acquisition.
[0007] Preferably, the signal biasing circuit includes a fifth chip, a seventeenth capacitor electrically connected to the fifth chip, a twenty-sixth resistor electrically connected to the fifth chip, a sixteenth resistor electrically connected to the fifth chip, the sixteenth resistor being electrically connected to the twenty-sixth resistor, a fourth diode electrically connected to the fifth chip, the fourth diode being electrically connected to the twenty-sixth resistor, a third diode electrically connected to the fifth chip, the third diode being electrically connected to the sixteenth resistor, a fourteenth capacitor electrically connected to the fifth chip, an eighteenth resistor electrically connected to the fifth chip, and a seventeenth resistor electrically connected to the fifth chip. The seventeenth resistor being electrically connected to the eighteenth resistor, through an operational amplifier of the fifth chip with a 353 core, shifts the positive and negative waveforms to the positive half-cycle to meet the input standard of the signal comparison circuit.
[0008] Preferably, the signal comparison circuit includes a sixth chip, a twenty-ninth resistor electrically connected to the sixth chip, a thirteenth capacitor electrically connected to the sixth chip, a twenty-fourth resistor electrically connected to the sixth chip, the twenty-fourth resistor being electrically connected to the thirteenth capacitor, and a twenty-third resistor electrically connected to the sixth chip, the twenty-third resistor being electrically connected to the thirteenth capacitor. Using the sixth chip (model 393), waveform signals can be accurately captured and acquired. Through high-speed response, the waveform signal can be compared into a square wave signal in a timely manner and provided to the excitation signal circuit. Simultaneously, the voltage comparison circuit can shield against static electricity and other spike interference from the source, preventing device malfunction and reducing the microcontroller load.
[0009] Preferably, the excitation signal circuit includes a first chip, an eighth capacitor electrically connected to the first chip, a fourth resistor electrically connected to the first chip, a second pin electrically connected to the fourth resistor, the second pin electrically connected to the first chip, a second capacitor electrically connected to the first chip, a ninth capacitor electrically connected to the first chip, an eighth resistor electrically connected to the first chip, a fourth capacitor electrically connected to the eighth resistor, a sixth resistor electrically connected to the eighth resistor, and a second diode electrically connected to the eighth resistor. The second diode is electrically connected to both the sixth resistor and the fourth capacitor. By setting up the excitation signal circuit, the square wave signal input from the signal comparison circuit can be quickly acquired and then provided to the microcontroller with a stable periodic trigger signal. After receiving the signal, the microcontroller begins to receive the waveform signal from the A / D conversion circuit.
[0010] Preferably, the A / D conversion circuit includes a tenth chip, a thirty-second capacitor electrically connected to the tenth chip, a fortieth resistor electrically connected to the tenth chip, a thirty-third capacitor electrically connected to the fortieth resistor, a thirty-fourth capacitor electrically connected to the thirty-third capacitor, a thirty-seventh resistor electrically connected to the tenth chip, a thirty-first capacitor electrically connected to the tenth chip, a twenty-eighth capacitor electrically connected to the tenth chip, a twenty-ninth capacitor electrically connected to the tenth chip, and a thirtyth capacitor electrically connected to the tenth chip. The twenty-ninth, twenty-eighth, and thirtyth capacitors are all electrically connected to the thirty-first capacitor. A thirty-sixth resistor is electrically connected to the tenth chip, as are the twenty-seventh and thirty-fifth capacitors. The twenty-seventh and thirty-fifth capacitors are connected to the tenth chip. The 36th resistor is electrically connected. The 34th resistor and the 33rd resistor are electrically connected to the 10th chip. The 25th capacitor is electrically connected to the 10th chip. The 25th capacitor is electrically connected to the 33rd and 34th resistors. The 32nd resistor and the 22nd capacitor are electrically connected to the 10th chip. The 31st resistor and the 22nd capacitor are electrically connected to the 10th chip. The 32nd capacitor is electrically connected to the 10th chip. Through the powerful refresh rate and precise acquisition accuracy of the A / D conversion circuit, the waveform data is accurately segmented and sent to the microcontroller for acquisition via communication. The A / D conversion circuit can segment the waveform into more sampling points, making the waveform reconstruction better. At the same time, the A / D conversion circuit also has a delay function, giving the microcontroller more time to collect data.
[0011] Preferably, the microcontroller circuit includes a seventh chip, a forty-seventh resistor electrically connected to the seventh chip, a first switch electrically connected to the seventh chip, a forty-third capacitor electrically connected to the seventh chip, a forty-second capacitor electrically connected to the seventh chip, a second connection point electrically connected to the forty-second connection point, a thirty-eighth capacitor electrically connected to the second connection point, and a forty-sixth resistor electrically connected to the seventh chip. The forty-sixth resistor is electrically connected to both the thirty-eighth and forty-second capacitors. Through the configuration of the microcontroller circuit, the microcontroller can be provided with timer, data storage, and power supply functions.
[0012] Preferably, the communication circuit includes a thirteenth chip, to which a fifty-ninth resistor, a fifty-eighth resistor, a fifty-fourth capacitor, a fifty-first capacitor, a sixth diode, a fifth diode, a first thermistor (electrically connected to the fifth diode), and a second thermistor (electrically connected to the sixth diode) are also connected. This communication circuit configuration allows commands to be sent to the RS485 chip via URAT communication, and then converted by the RS485 chip to communicate with the host computer using the standard MODBUS protocol via an RS485 bus.
[0013] The beneficial effects of this utility model are as follows:
[0014] This invention achieves precise waveform capture through the design of an A / D conversion circuit. With the help of the signal comparison circuit and the excitation signal circuit, it can accurately capture the wavefront signal to provide a microcontroller circuit for signal acquisition to complete the waveform signal acquisition. The signal comparison circuit can also accurately shield interference signals such as electrostatic discharge, assisting the microcontroller circuit in signal acquisition. Attached Figure Description
[0015] Figure 1 This is a circuit flowchart of the flexible Rogowski coil of this utility model;
[0016] Figure 2 For the present utility model Figure 1 Schematic diagram of a signal amplifier circuit;
[0017] Figure 3 For the present utility model Figure 1 Schematic diagram of signal biasing circuit;
[0018] Figure 4 For the present utility model Figure 1 Schematic diagram of a signal comparison circuit;
[0019] Figure 5 For the present utility model Figure 1 A schematic diagram of the excitation signal circuit;
[0020] Figure 6 For the present utility model Figure 1 A schematic diagram of an A / D conversion circuit;
[0021] Figure 7 For the present utility model Figure 1 A schematic diagram of a microcontroller circuit;
[0022] Figure 8 For the present utility model Figure 1 A schematic diagram of the communication circuit.
[0023] In the diagram: 1. Signal amplification circuit; 2. Signal bias circuit; 3. Signal comparison circuit; 4. Excitation signal circuit; 5. A / D conversion circuit; 6. Microcontroller circuit; 7. Communication circuit; U1, First chip; U2, Second chip; U5, Fifth chip; U6, Sixth chip; U7, Seventh chip; U10, Tenth chip; U13, Thirteenth chip; C2, Second capacitor; C3, Third capacitor; C4, Fourth capacitor; C6, Sixth capacitor; C7, Seventh capacitor; C8, Eighth capacitor; C9, Ninth capacitor; C13, Thirteenth capacitor; C14, Fourteenth capacitor; C17, Seventeenth capacitor; C22, Twenty-second capacitor; C25, Twenty-fifth capacitor; C27, Twenty-seventh capacitor; C28, Twenty-eighth capacitor; C29, Twenty-ninth capacitor; C30, Thirtieth capacitor; C31, Thirty-first capacitor; C32, Thirty-second capacitor; C33, Thirty-third capacitor; C34, Thirty-fourth capacitor. Capacitors: C38, the 38th capacitor; C42, the 42nd capacitor; C43, the 43rd capacitor; C51, the 51st capacitor; C54, the 54th capacitor; R4, the 4th resistor; R6, the 6th resistor; R7, the 7th resistor; R8, the 8th resistor; R11, the 11th resistor; R12, the 12th resistor; R16, the 16th resistor; R17, the 17th resistor; R18, the 18th resistor; R23, the 23rd resistor; R24, the 24th resistor; R26, the 26th resistor; R29, the 29th resistor; R31, the 31st resistor; R32, the 32nd resistor; R33, the 33rd resistor; R34, the 34th resistor; R35, the 35th resistor; R36, the 36th resistor; R37, the 37th resistor; R40, the 40th resistor; R46, the 46th resistor; R47, the 47th resistor; R58, the 58th resistor; R59, the 59th resistor;
[0024] W2, second pin; W3, third pin; D2, second diode; D3, third diode; D4, fourth diode; D5, fifth diode; D6, sixth diode; S1, first switch; Y2, second connection point; PPTC1, first thermistor; PPTC2, second thermistor. Detailed Implementation
[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.
[0026] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 A flexible Rogowski coil-based circuit includes a signal amplification circuit 1, a signal bias circuit 2 electrically connected to the signal amplification circuit 1, a signal comparison circuit 3 electrically connected to the signal bias circuit 2, an excitation signal circuit 4 electrically connected to the signal comparison circuit 3, an A / D conversion circuit 5 electrically connected to the signal amplification circuit 1, a microcontroller circuit 6 electrically connected to both the A / D conversion circuit 5 and the excitation signal circuit 4, and a communication circuit 7 electrically connected to the microcontroller circuit 6.
[0027] Please see Figure 1 , Figure 2 The signal amplification circuit 1 includes a second chip U2, a seventh capacitor C7 electrically connected to the second chip U2, a seventh resistor R7 electrically connected to the second chip U2, an eleventh resistor R11 electrically connected to the second chip U2, a third pin W3 electrically connected to the eleventh resistor R11, a twelfth resistor R12 electrically connected to the second chip U2, a sixth capacitor C6 electrically connected to the twelfth resistor R12, and a third capacitor C3 electrically connected to the second chip U2. Through the second chip U2 operational amplifier with a 3140 core, the waveform signal can be amplified, making the signal power stronger and the amplitude larger, which is convenient for subsequent circuit acquisition.
[0028] Please see Figure 1 , Figure 3The signal bias circuit 2 includes a fifth chip U5, a seventeenth capacitor C17 electrically connected to the fifth chip U5, a twenty-sixth resistor R26 electrically connected to the fifth chip U5, a sixteenth resistor R16 electrically connected to the fifth chip U5, the sixteenth resistor R16 being electrically connected to the twenty-sixth resistor R26, a fourth diode D4 electrically connected to the fifth chip U5, the fourth diode D4 being electrically connected to the twenty-sixth resistor R26, a third diode D3 electrically connected to the fifth chip U5, the third diode D3 being electrically connected to the sixteenth resistor R16, a fourteenth capacitor C14 electrically connected to the fifth chip U5, an eighteenth resistor R18 electrically connected to the fifth chip U5, and a seventeenth resistor R17 electrically connected to the fifth chip U5, the seventeenth resistor R17 being electrically connected to the eighteenth resistor R18. Through the operational amplifier of the fifth chip U5 (model 353 core), the positive and negative waveforms are shifted to the positive half-cycle to meet the input standard of the signal comparison circuit.
[0029] Please see Figure 1 , Figure 4 The signal comparison circuit 3 includes a sixth chip U6, a twenty-ninth resistor R29 electrically connected to the sixth chip U6, a thirteenth capacitor C13 electrically connected to the sixth chip U6, a twenty-fourth resistor R24 electrically connected to the sixth chip U6, the twenty-fourth resistor R24 electrically connected to the thirteenth capacitor C13, and a twenty-third resistor R23 electrically connected to the sixth chip U6, the twenty-third resistor R23 electrically connected to the thirteenth capacitor C13. Through the sixth chip U6, model 393, waveform signals can be accurately captured and acquired. With its high-speed response, the waveform signal can be compared into a square wave signal in the first time and provided to the excitation signal circuit. At the same time, the voltage comparison circuit can shield against static electricity and other spike interference from the source, prevent equipment malfunction, and reduce the load on the microcontroller.
[0030] Please see Figure 1 , Figure 5 The excitation signal circuit 4 includes a first chip U1, an eighth capacitor C8 electrically connected to the first chip U1, a fourth resistor R4 electrically connected to the first chip U1, a second pin W2 electrically connected to the fourth resistor R4, a second capacitor C2 electrically connected to the first chip U1, a ninth capacitor C9 electrically connected to the first chip U1, an eighth resistor R8 electrically connected to the first chip U1, a fourth capacitor C4 electrically connected to the eighth resistor R8, a sixth resistor R6 electrically connected to the eighth resistor R8, and a second diode D2 electrically connected to the eighth resistor R8. The second diode D2 is electrically connected to both the sixth resistor R6 and the fourth capacitor C4. Through the configuration of the excitation signal circuit 4, the square wave signal input from the signal comparison circuit can be quickly acquired and then provided to the microcontroller with a stable periodic trigger signal. After receiving the signal, the microcontroller begins to receive the waveform signal from the A / D conversion circuit 5.
[0031] Please see Figure 1 , Figure 6 The A / D conversion circuit 5 includes a tenth chip U10, to which a thirty-second capacitor C32 is electrically connected; a fortieth resistor R40 is electrically connected; a thirty-third capacitor C33 is electrically connected to the fortieth resistor R40; a thirty-fourth capacitor C34 is electrically connected to the thirty-third capacitor C33; a thirty-seventh resistor R37 is electrically connected to the tenth chip U10; a thirty-first capacitor C31 is electrically connected to the tenth chip U10; and a twenty-eighth... Capacitor C28, the tenth chip U10 is electrically connected to the twenty-ninth capacitor C29, the tenth chip U10 is electrically connected to the thirtieth capacitor C30, the twenty-ninth capacitor C29, the twenty-eighth capacitor C28, and the thirtieth capacitor C30 are all electrically connected to the thirty-first capacitor C31, the tenth chip U10 is electrically connected to the thirty-sixth resistor R36, the tenth chip U10 is electrically connected to the twenty-seventh capacitor C27, the tenth chip U10 is electrically connected to the thirty-fifth resistor R35, the twenty-seventh capacitor C27 and the third Resistors R35 (15th) and R36 (36th) are electrically connected. Resistor R34 (34th) and R33 (33rd) are electrically connected to chip U10. Capacitor C25 (25th) is electrically connected to chip U10. Capacitor C25 is electrically connected to both resistors R33 and R34. Resistor R32 (32nd) and C22 (22nd) are electrically connected to chip U10. The chip U10 is electrically connected to the thirty-first resistor R31. The twenty-second capacitor C22 is also electrically connected to the thirty-first resistor R31 and the thirty-second resistor R32. Through the powerful refresh rate and precise acquisition accuracy of the tenth chip U10 of the A / D conversion circuit 5, the waveform data is accurately segmented and sent to the microcontroller for acquisition via communication. The A / D conversion circuit 5 can segment the waveform into more sampling points, making the waveform reconstruction better. At the same time, the A / C conversion circuit 5 also has a delay function, giving the microcontroller more time to collect data.
[0032] Please see Figure 1 , Figure 7The microcontroller circuit 6 includes a seventh chip U7, a forty-seventh resistor R47 electrically connected to the seventh chip U7, a first switch S1 electrically connected to the seventh chip U7, a forty-third capacitor C43 electrically connected to the seventh chip U7, a forty-second capacitor C42 electrically connected to the seventh chip U7, a second connection point Y2 electrically connected to the forty-eighth capacitor C38 electrically connected to the second connection point Y2, and a forty-sixth resistor R46 electrically connected to the seventh chip U7. The forty-sixth resistor R46 is electrically connected to both the forty-eighth capacitor C38 and the forty-second capacitor C42. Through the configuration of the microcontroller circuit 6, the microcontroller can be provided with timer, data storage, and power supply functions.
[0033] Please see Figure 1 , Figure 8 The communication circuit 7 includes a thirteenth chip U13, to which are electrically connected resistors R59 and R58, capacitors C54 and C51, diodes D6 and D5, and a thermistor PPTC1. PPTC1 is electrically connected to diode D5. PPTC2 is also electrically connected to diode D6. Through the configuration of the communication circuit 7, commands can be sent to the 485 chip via URAT communication. The 485 chip then converts these commands into RS485 bus data and uses the standard MODBUS protocol to communicate with the host computer.
[0034] The specific implementation process of this utility model is as follows:
[0035] 1. The waveform signal can be amplified by the second chip U2 operational amplifier with the 3140 core, making the signal power stronger and the amplitude larger, which is convenient for subsequent circuit acquisition.
[0036] 2. The positive and negative waveforms are shifted to the positive half-cycle using the fifth chip U5 operational amplifier with the 353 core to meet the input standard of the signal comparison circuit.
[0037] 3. The sixth chip U6, model 393, can accurately capture and acquire waveform signals. With its high-speed response, it can compare the waveform signal into a square wave signal in the first time and provide it to the excitation signal circuit. At the same time, the voltage comparison circuit can shield the spike interference such as static electricity from the source, prevent the equipment from malfunctioning, and reduce the load on the microcontroller.
[0038] 4. By setting the excitation signal circuit 4, the square wave signal input to the signal comparison circuit can be quickly acquired and then provided to the microcontroller with a stable periodic trigger signal. After receiving the signal, the microcontroller begins to receive the waveform signal of the A / D conversion circuit 5.
[0039] 5. The waveform data is precisely segmented by the powerful refresh rate and accurate acquisition precision of the tenth chip U10 of the A / D conversion circuit 5 and sent to the microcontroller for acquisition via communication. The A / D conversion circuit 5 can segment the waveform into more sampling points, making the waveform reconstruction better. At the same time, the A / C conversion circuit 5 also has a delay function, giving the microcontroller more time to collect data.
[0040] 6. Through the configuration of the microcontroller circuit 6, the microcontroller can be provided with timer, data storage, and power supply functions;
[0041] 7. Through the configuration of communication circuit 7, commands can be sent to the 485 chip via URAT communication, and then converted by the 485 chip into RS485 bus to communicate with the host computer using the standard MODBUS protocol.
[0042] The A / D conversion circuit 5 is configured to achieve accurate waveform capture. With the help of the signal comparison circuit 3 and the excitation signal circuit 4, the wavefront signal can be accurately captured to provide the microcontroller circuit 6 with signal acquisition to complete the waveform signal acquisition. The signal comparison circuit 3 can also accurately shield interference signals such as electrostatic discharge, assisting the microcontroller circuit 6 in signal acquisition.
[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A flexible Rogowski coil-based circuit, comprising a signal amplification circuit (1), characterized in that: The signal amplification circuit (1) is electrically connected to a signal bias circuit (2), the signal bias circuit (2) is electrically connected to a signal comparison circuit (3), the signal comparison circuit (3) is electrically connected to an excitation signal circuit (4), the signal amplification circuit (1) is electrically connected to an A / D conversion circuit (5), the A / D conversion circuit (5) and the excitation signal circuit (4) are electrically connected to a single-chip microcomputer circuit (6), and the single-chip microcomputer circuit (6) is electrically connected to a communication circuit (7).
2. The flexible Rogowski coil-based circuit according to claim 1, characterized in that: The signal amplification circuit (1) includes a second chip (U2), a seventh capacitor (C7) electrically connected to the second chip (U2), a seventh resistor (R7) electrically connected to the second chip (U2), an eleventh resistor (R11) electrically connected to the second chip (U2), a third pin (W3) electrically connected to the eleventh resistor (R11), a twelfth resistor (R12) electrically connected to the second chip (U2), a sixth capacitor (C6) electrically connected to the twelfth resistor (R12), and a third capacitor (C3) electrically connected to the second chip (U2).
3. The flexible Rogowski coil-based circuit according to claim 1, characterized in that: The signal bias circuit (2) includes a fifth chip (U5), to which a seventeenth capacitor (C17) is electrically connected, a twenty-sixth resistor (R26) is electrically connected, a sixteenth resistor (R16) is electrically connected, the sixteenth resistor (R16) and the twenty-sixth resistor (R26) are electrically connected, and a fourth diode (D4) is electrically connected to the fifth chip (U5). The fifth chip (U5) is electrically connected to a third diode (D3), which is electrically connected to the sixteenth resistor (R16). The fifth chip (U5) is electrically connected to a fourteenth capacitor (C14), an eighteenth resistor (R18), and a seventeenth resistor (R17). The seventeenth resistor (R17) is electrically connected to the eighteenth resistor (R18).
4. A flexible Rogowski coil-based circuit according to claim 1, characterized in that: The signal comparison circuit (3) includes a sixth chip (U6), a twenty-ninth resistor (R29) electrically connected to the sixth chip (U6), a thirteenth capacitor (C13) electrically connected to the sixth chip (U6), a twenty-fourth resistor (R24) electrically connected to the sixth chip (U6), the twenty-fourth resistor (R24) electrically connected to the thirteenth capacitor (C13), and a twenty-third resistor (R23) electrically connected to the sixth chip (U6), the twenty-third resistor (R23) electrically connected to the thirteenth capacitor (C13).
5. A flexible Rogowski coil-based circuit according to claim 1, characterized in that: The excitation signal circuit (4) includes a first chip (U1), an eighth capacitor (C8) electrically connected to the first chip (U1), a fourth resistor (R4) electrically connected to the first chip (U1), a second pin (W2) electrically connected to the fourth resistor (R4), the second pin (W2) electrically connected to the first chip (U1), a second capacitor (C2) electrically connected to the first chip (U1), a ninth capacitor (C9) electrically connected to the first chip (U1), an eighth resistor (R8) electrically connected to the first chip (U1), a fourth capacitor (C4) electrically connected to the eighth resistor (R8), a sixth resistor (R6) electrically connected to the eighth resistor (R8), and a second diode (D2) electrically connected to the eighth resistor (R8). The second diode (D2) is electrically connected to both the sixth resistor (R6) and the fourth capacitor (C4).
6. A flexible Rogowski coil-based circuit according to claim 1, characterized in that: The A / D conversion circuit (5) includes a tenth chip (U10), to which a thirty-second capacitor (C32) is electrically connected, a fortieth resistor (R40) is electrically connected, a thirty-third capacitor (C33) is electrically connected, a thirty-fourth capacitor (C34) is electrically connected, and a thirty-seventh resistor (R37) is electrically connected. The tenth chip (U10) is electrically connected to a 31st capacitor (C31), a 28th capacitor (C28), a 29th capacitor (C29), and a 30th capacitor (C30). The 29th, 28th, and 30th capacitors are all electrically connected to the 31st capacitor (C31). The tenth chip (U10) is also electrically connected to a 36th resistor (R). 36) A twenty-seventh capacitor (C27) is electrically connected to the tenth chip (U10). A thirty-fifth resistor (R35) is electrically connected to the tenth chip (U10). The twenty-seventh capacitor (C27), the thirty-fifth resistor (R35), and the thirty-sixth resistor (R36) are all electrically connected to the tenth chip (U10). A thirty-fourth resistor (R34) is electrically connected to the tenth chip (U10). A thirty-third resistor (R33) is electrically connected to the tenth chip (U10). A second... The 15th capacitor (C25) is electrically connected to the 33rd resistor (R33) and the 34th resistor (R34). The 10th chip (U10) is electrically connected to the 32nd resistor (R32), the 22nd capacitor (C22) is electrically connected to the 10th chip (U10), and the 31st resistor (R31) is electrically connected to the 10th chip (U10). The 22nd capacitor (C22) is electrically connected to the 31st resistor (R31) and the 32nd resistor (R32).
7. A flexible Rogowski coil-based circuit according to claim 1, characterized in that: The microcontroller circuit (6) includes a seventh chip (U7), a forty-seventh resistor (R47) electrically connected to the seventh chip (U7), a first switch (S1) electrically connected to the seventh chip (U7), a forty-third capacitor (C43) electrically connected to the seventh chip (U7), a forty-second capacitor (C42) electrically connected to the seventh chip (U7), a second connection point (Y2) electrically connected to the forty-eighth capacitor (C38) electrically connected to the second connection point (Y2), and a forty-sixth resistor (R46) electrically connected to the seventh chip (U7). The forty-sixth resistor (R46) is electrically connected to both the forty-eighth capacitor (C38) and the forty-second capacitor (C42).
8. A flexible Rogowski coil-based circuit according to claim 1, characterized in that: The communication circuit (7) includes a thirteenth chip (U13), to which a fifty-ninth resistor (R59) is electrically connected, a fifty-eighth resistor (R58) is electrically connected, a fifty-fourth capacitor (C54) is electrically connected, a fifty-first capacitor (C51) is electrically connected, a sixth diode (D6) is electrically connected, a fifth diode (D5) is electrically connected, a first thermistor (PPTC1) is electrically connected to the thirteenth chip (U13), the first thermistor (PPTC1) is electrically connected to the fifth diode (D5), a second thermistor (PPTC2) is electrically connected to the thirteenth chip (U13), and the second thermistor (PPTC2) is electrically connected to the sixth diode (D6).