Electromagnetic interference detection device and electronic equipment

Abstract

The utility model discloses an electromagnetic interference detection device, which is applied to electronic equipment, the electronic equipment comprises a target printed circuit board, the target printed circuit board is provided with a device and / or a circuit sensitive to electromagnetic interference, the electromagnetic interference detection device comprises a detection coil and a signal conditioning circuit, the detection coil is electrically connected with the signal conditioning circuit, the detection coil is arranged on a target printed circuit board and at least surrounds the periphery of a device and / or a circuit sensitive to electromagnetic interference; the signal conditioning circuit is used for processing the induced voltage signal output by the detection coil and then outputting an electromagnetic interference characterization signal, and the electromagnetic interference characterization signal is used for characterizing the electromagnetic interference intensity around a device and / or a circuit sensitive to electromagnetic interference. The electromagnetic interference detection device provided by the utility model can be integrated in electronic equipment, does not need additional electromagnetic interference detection equipment, and is simple in scheme and low in cost.

Description

Technical Field

[0001] This application relates to the field of electromagnetic interference technology, and in particular to an electromagnetic interference detection device and a motor driver. Background Technology

[0002] With the widespread application of electronic products, especially the large-scale deployment of industrial automation equipment in smart factories, electromagnetic interference in the spatial environment has become increasingly complex and severe. High-energy electromagnetic interference poses a serious challenge to the stable operation of factory automation equipment. Since motor drivers use inverters composed of power transistors to drive the motor, the output voltage is a high-voltage square wave signal containing a large amount of high-energy dv / dt or di / dt electromagnetic interference. This electromagnetic interference can be conducted through signal lines or power lines (RST power lines or UVW motor lines) or through near-field electromagnetic radiation, affecting the driver itself or surrounding equipment. When the conduction or radiation capabilities are strong, it can affect the operational stability of the motor driver or surrounding equipment, causing the driver or other surrounding equipment to malfunction.

[0003] Currently, common methods for electromagnetic interference (EMI) analysis include spectrum analyzers and oscilloscope measurements. These techniques analyze the electromagnetic environment by analyzing electromagnetic frequencies or signal waveforms. While spectrum analyzers and oscilloscopes can display the current electromagnetic interference situation, their use in industrial automation equipment (especially motor drives) has significant drawbacks: firstly, these devices can only display the spectrum or signal waveform of the interference, requiring personnel with specialized EMI technical backgrounds to interpret and analyze the results to understand the specific nature of the interference, thus limiting their applicability; secondly, these types of devices are complex and precise measuring instruments, extremely expensive, and difficult to integrate widely into motor drives.

[0004] Existing technologies cannot provide a low-cost solution to intuitively reflect the interference status of automated equipment. Therefore, it is necessary to develop a low-cost, easy-to-use, and intuitive solution to address the above problems. Utility Model Content

[0005] The main purpose of this invention is to provide an electromagnetic interference detection device and a motor driver, which aims to solve the problem of not being able to intuitively reflect the interference intensity of automated equipment through a low-cost solution.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] An electromagnetic interference (EMI) detection device is applied to an electronic device. The electronic device includes a target printed circuit board (PCB) on which electromagnetic interference-sensitive devices and / or circuits are disposed. The EMI detection device includes a detection coil and a signal conditioning circuit, wherein the detection coil is electrically connected to the signal conditioning circuit.

[0008] The detection coil is disposed on the target printed circuit board, and the detection coil at least surrounds the outer periphery of the device and / or circuit sensitive to electromagnetic interference;

[0009] The signal conditioning circuit is used to process the induced voltage signal output by the detection coil and output an electromagnetic interference characterization signal. The electromagnetic interference characterization signal is used to characterize the electromagnetic interference intensity around the electromagnetic interference sensitive device and / or circuit.

[0010] Optionally, the detection coil is a printed circuit board trace on the target printed circuit board.

[0011] Optionally, the detection coil includes a single-turn or multi-turn coil, which is disposed on a single-layer copper foil surface and / or a multi-layer copper foil surface of the target printed circuit board.

[0012] Optionally, the electromagnetic interference detection device further includes a resonant capacitor C1, which is connected in parallel to the beginning and end of the detection coil. The resonant capacitor C1 and the detection coil form a resonant frequency selection circuit, which is used to perform frequency selection processing on the induced voltage signal and output a frequency selection signal.

[0013] Optionally, the signal conditioning circuit includes a filtering and amplification module and a peak detection module. The input terminal of the filtering and amplification module is connected to the output terminal of the frequency selection circuit, and the output terminal of the filtering and amplification module is connected to the input terminal of the peak detection module. The filtering and amplification module is used to filter and amplify the frequency selection signal output by the frequency selection circuit, and the peak detection module is used to convert the high-frequency signal output by the filtering and amplification module into a low-frequency signal.

[0014] Optionally, the filtering and amplification module includes a first filtering and amplification unit, which is used to amplify and filter the frequency-selective signal and then output a first sampling signal.

[0015] Optionally, the filtering and amplification module further includes a second filtering and amplification unit, which is used to further amplify and filter the first sampled signal and output a second sampled signal.

[0016] Optionally, the first filtering and amplification unit includes: a first operational amplifier U1, a first resistor R1, a second resistor R2, a second capacitor C2, and a third capacitor C3. The first terminal of the second capacitor C2 is connected to the first output terminal of the frequency selection circuit, the second terminal of the second capacitor C2 is connected to the first terminal of the first resistor R1, the second terminal of the first resistor R1 is connected to the inverting input terminal of the first operational amplifier U1, the non-inverting input terminal of the first operational amplifier U1 is connected to the second output terminal of the frequency selection circuit, and the second resistor R2 and the third capacitor C3 are connected in parallel between the inverting input terminal and the output terminal of the first operational amplifier U1, respectively.

[0017] The second filtering and amplification unit includes: a second operational amplifier U2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a fourth capacitor C4. The fifth resistor R5 and the fourth capacitor C4 are connected in parallel to the inverting input and output of the second operational amplifier U2, respectively. The first end of the third resistor R3 is connected to the inverting input of the second operational amplifier U2, and the second end of the third resistor R3 is connected to signal ground. The first end of the fourth resistor R4 is connected to the output of the first operational amplifier U1, and the second end of the fourth resistor R4 is connected to the non-inverting input of the second operational amplifier U2.

[0018] Optionally, the peak detection module includes a diode D1, a fifth capacitor C5, and a sixth resistor R6. The anode of the diode D1 is connected to the output terminal of the filter amplification module, and the cathode of the diode D1 is connected to the output terminal of the peak detection module. The fifth capacitor C5 and the sixth resistor R6 are connected in parallel, with one end connected to the cathode of the diode D1 and the other end connected to signal ground.

[0019] Optionally, the signal conditioning circuit further includes an analog-to-digital converter module, which is used to convert the low-frequency signal output by the peak detection module from an analog quantity into a digital quantity.

[0020] Optionally, the electromagnetic interference detection device further includes a microprocessor module, the input of which is connected to the output of the signal conditioning circuit, and the microprocessor module is used to determine the electromagnetic interference intensity around the electromagnetically interference-sensitive device / circuit based on the electromagnetic interference characterization signal.

[0021] Optionally, the electromagnetic interference detection device further includes a display module, the input terminal of which is connected to the output terminal of the microprocessor module, and the display module is used to display the electromagnetic interference intensity around the electromagnetically sensitive device / circuit.

[0022] This utility model also provides an electronic device, which includes the electromagnetic interference detection device described above.

[0023] Optionally, the electronic device is a motor driver.

[0024] This utility model has at least the following technical benefits:

[0025] The electromagnetic interference (EMI) detection device provided by this invention is installed on the target printed circuit board of an electronic device. A detection coil on the EMI detection device surrounds the EMI-sensitive device and / or circuit on the target printed circuit board. The signal conditioning circuit on the EMI detection device processes the induced voltage signal output by the detection coil and outputs an EMI characterization signal. This EMI characterization signal can characterize the EMI intensity around the EMI-sensitive device and / or circuit. Compared to existing EMI detection devices, the EMI detection device provided by this invention can be integrated into the electronic device, eliminating the need for additional EMI detection equipment, resulting in a simple and low-cost solution. Attached Figure Description

[0026] Figure 1 This is a structural block diagram of the electromagnetic interference detection device provided in the embodiments of this application;

[0027] Figure 2 Another structural block diagram of the electromagnetic interference detection device provided in the embodiments of this application;

[0028] Figure 3 Another structural block diagram of the electromagnetic interference detection device provided in the embodiments of this application;

[0029] Figure 4 Another structural block diagram of the electromagnetic interference detection device provided in the embodiments of this application;

[0030] Figure 5 This is a schematic diagram of electromagnetic interference of a motor driver provided in an embodiment of this application. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0033] In this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that an apparatus or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such an apparatus or system. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the apparatus or system that includes that element.

[0034] like Figure 1-4 The diagram shows a structural block diagram and a schematic diagram of an electromagnetic interference detection device according to an embodiment of this application. This electromagnetic interference detection device is applied to an electronic device, which includes a target printed circuit board 100. The target printed circuit board 100 is provided with devices and / or circuits sensitive to electromagnetic interference. The electromagnetic interference detection device includes: a detection coil 10 and a signal conditioning circuit 20. The detection coil 10 is electrically connected to the signal conditioning circuit 20.

[0035] The detection coil 10 is disposed on the target printed circuit board 100, and the detection coil 10 at least surrounds the outer periphery of the device and / or circuit that is sensitive to electromagnetic interference.

[0036] The signal conditioning circuit is used to process the induced voltage signal output by the detection coil 10 and output an electromagnetic interference characterization signal. The electromagnetic interference characterization signal is used to characterize the electromagnetic interference intensity around electromagnetic interference sensitive devices and / or circuits.

[0037] The electromagnetic interference detection device provided in this application embodiment has a detection coil 10 disposed on a target printed circuit board 100. The detection coil 10 may be a metal conductive line. The metal conductive line surrounds the electromagnetically sensitive devices and / or circuits on the target printed circuit board 100. The path surrounded by the metal conductive line forms the detection coil 10. It should be noted that the detection coil 10 has no cross connection points. Optionally, the orthographic projection of the detection coil on the target printed circuit board 100 may have cross connection points, forming a closed shape containing circles, quadrilaterals or other irregular shapes. The shape of the detection coil 10 depends on the distribution shape of the electromagnetically sensitive devices and / or circuits on the target printed circuit board 100, and is not limited here.

[0038] Existing technologies require an additional testing device to detect electromagnetic interference in electronic devices, which is costly. The electromagnetic interference detection device provided in this application is integrated into the electronic device, resulting in a simple and low-cost solution.

[0039] Optionally, the detection coil 10 is a printed circuit board trace on the target printed circuit board 100.

[0040] The detection coil 10 can be set on the target printed circuit board 100 in the form of copper printed circuit board traces. This solution has low processing cost and can be better connected with other circuits.

[0041] Optionally, the detection coil 10 includes a single-turn or multi-turn coil, which is disposed on a single-layer copper foil surface and / or a multi-layer copper foil surface of the target printed circuit board 100.

[0042] The detection coil 10 can be arranged in a single turn on a copper foil layer of the target printed circuit board 100, or it can be repeatedly wound multiple times on a copper foil layer. When the target printed circuit board 100 is a multilayer board, the single-turn coil can be wound around different copper foil layers by passing through vias on the printed circuit board 100, or the number of turns can be different on different copper foil layers, which is not limited here. When the detection coil 10 includes a multi-turn coil, the induced voltage signal on the detection coil 10 is stronger. The strength of the induced voltage signal can be freely adjusted by setting the single-turn or multi-turn coil. In addition, the detection coil 10 can be arranged on any single-layer copper foil layer and / or multi-layer copper foil layer of the target printed circuit board 100, which can better cover more electromagnetically sensitive devices and / or circuits on the target printed circuit board 100.

[0043] Optionally, the electromagnetic interference detection device also includes a resonant capacitor C1, which is connected in parallel to the beginning and end of the detection coil 10. The resonant capacitor C1 and the detection coil 10 form a resonant frequency selection circuit 001, which is used to perform frequency selection processing on the induced voltage signal and output a frequency selection signal.

[0044] Since the detection coil 10 can sense interference signals of various frequencies, only some frequency bands of interference signals have an impact on the devices and / or circuits on the target printed circuit board. Therefore, it is necessary to filter out some other interference signals that have no impact. The detection coil 10 itself can be regarded as an inductor L. The resonant capacitor C1 is equivalent to being connected in parallel with the inductor L to form a parallel LC resonant frequency selection circuit 001. The resonant frequency value of the resonant frequency selection circuit 001 can be changed by adjusting the value of capacitor C1, so as to select the signal in the desired frequency range.

[0045] Optionally, the signal conditioning circuit 20 includes a filter amplification module 201 and a peak detection module 202. The input terminal of the filter amplification module 201 is connected to the output terminal of the frequency selection circuit 001, and the output terminal of the filter amplification module 201 is connected to the input terminal of the peak detection module 202. The filter amplification module 201 is used to filter and amplify the frequency selection signal output by the frequency selection circuit 001, and the peak detection module 202 is used to convert the high-frequency signal output by the filter amplification module 201 into a low-frequency signal.

[0046] On the one hand, since the frequency selection signal output by the resonant frequency selection circuit 001 still contains some signals that have no effect on the devices and / or circuits on the target printed circuit board, further filtering of the signal is required. On the other hand, since the amplitude of the induced voltage signal output by the detection coil 10 is small, the signal needs to be amplified. The filter amplification module 201 integrates filtering and amplification into one circuit, making the circuit simpler. The peak detection module 202 converts the high-frequency signal output by the filter amplification module 201 into a low-frequency signal before outputting it, which facilitates the subsequent analysis of the output signal. For example, simpler devices or equipment can be used to analyze the signal, saving the cost of the electromagnetic interference detection device.

[0047] Optionally, the filtering and amplification module 201 includes a first filtering and amplification unit, which is used to amplify and filter the frequency-selective signal and output a first sampled signal.

[0048] Optionally, the filtering and amplification module 201 further includes a second filtering and amplification unit, which is used to further amplify and filter the first sampled signal and output the second sampled signal.

[0049] In some embodiments, the frequency-selective signal can be filtered and amplified in one stage. If the filtering and amplification effect is not sufficient, another stage of filtering and amplification can be added, with the two stages of filtering and amplification circuits connected in series.

[0050] Optionally, the first filtering and amplification unit includes: a first operational amplifier U1, a first resistor R1, a second resistor R2, a second capacitor C2, and a third capacitor C3. The first terminal of the second capacitor C2 is connected to the first output terminal of the frequency selection circuit, the second terminal of the second capacitor C2 is connected to the first terminal of the first resistor R1, the second terminal of the first resistor R1 is connected to the inverting input terminal of the first operational amplifier U1, the non-inverting input terminal of the first operational amplifier U1 is connected to the second output terminal of the frequency selection circuit, and the second resistor R2 and the third capacitor C3 are connected in parallel between the inverting input terminal and the output terminal of the first operational amplifier U1, respectively.

[0051] The second filtering and amplification unit includes: a second operational amplifier U2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a fourth capacitor C4. The fifth resistor R5 and the fourth capacitor C4 are connected in parallel to the inverting input and output of the second operational amplifier U2, respectively. The first end of the third resistor R3 is connected to the inverting input of the second operational amplifier U2, and the second end of the third resistor R3 is connected to signal ground. The first end of the fourth resistor R4 is connected to the output of the first operational amplifier U1, and the second end of the fourth resistor R4 is connected to the non-inverting input of the second operational amplifier U2.

[0052] The filter pass frequency of the filter amplifier module 201 can be changed by adjusting the resistance value of the first resistor R1, the capacitance value of the second capacitor C2, and the capacitance value of the third capacitor C3; the amplification factor of the filter amplifier module 201 can be changed by adjusting the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, and the fifth resistor R5.

[0053] Optionally, the peak detection module 202 includes a diode D1, a fifth capacitor C5, and a sixth resistor R6. The anode of diode D1 is connected to the output terminal of the filter amplification module 201, and the cathode of diode D1 is connected to the output terminal of the peak detection module 202. The fifth capacitor C5 and the sixth resistor R6 are connected in parallel, with one end connected to the cathode of diode D1 and the other end connected to signal ground. The peak detection module 202 converts the high-frequency signal output by the filter amplification module 201 into a smooth low-frequency signal through the charging and discharging of capacitor C5. This low-frequency signal can be directly connected to the MCU chip interface. The MCU chip uses its built-in analog-to-digital converter to convert it into a digital signal for analysis, eliminating the need for an additional analog-to-digital converter chip and saving circuit costs.

[0054] Optionally, the signal conditioning circuit also includes an analog-to-digital converter module 203, which is used to convert the low-frequency signal output by the peak detector module 202 from analog to digital; the analog-to-digital converter module 203 can be a common analog-to-digital converter chip.

[0055] Optionally, the electromagnetic interference detection device also includes a microprocessor module 30. The input terminal of the microprocessor module 30 is connected to the output terminal of the signal conditioning circuit. The microprocessor module 30 is used to determine the electromagnetic interference intensity around electromagnetically sensitive devices / circuits based on the electromagnetic interference characterization signal. The microprocessor module 30 can be a programmable logic processing chip such as an MCU. The microprocessor 30 can analyze and judge the electromagnetic interference characterization signal and output the electromagnetic interference intensity level, such as: outputting an Arabic numeral to represent the electromagnetic interference intensity level, outputting a fault signal or alarm signal to represent the electromagnetic interference intensity level, or customizing other forms of output to represent the interference intensity level according to the needs of the application site.

[0056] Optionally, the electromagnetic interference detection device also includes a display module 40, the input terminal of which is connected to the output terminal of the microprocessor module 30. The display module 40 is used to display the electromagnetic interference intensity around the electromagnetically sensitive device / circuit.

[0057] The display module 40 can be an LED digital tube, a digital display panel, etc. The electromagnetic interference intensity can be displayed in the form of numerical values, display colors, waveforms, etc., without any limitation. The display module 40 can intuitively display the electromagnetic interference situation, providing guidance for technicians to handle electromagnetic interference.

[0058] This application embodiment also provides an electronic device, which includes the electromagnetic interference detection device as described above; the electronic device can be any device containing a printed circuit board 100, such as: motor controller, touch screen, PLC (programmable logic controller), robot control, etc.; the detection coil 10 can be disposed on any printed circuit board 100 of the electronic device.

[0059] Optionally, the electronic device is a motor driver 200; such as Figure 5 The diagram illustrates an electromagnetic interference (EMI) scenario of a motor driver 200 according to an embodiment of this application. Since the motor driver 200 uses an inverter output voltage composed of power transistors to drive the motor, the power transistors are in a high-frequency switching state, resulting in a large amount of high-energy dv / dt or di / dt EMI. This EMI can be conducted through signal lines or power lines (RST power lines or UVW motor lines) or through near-field electromagnetic radiation, affecting the motor driver 200 itself or surrounding equipment. When the conduction or radiation capabilities are strong, the generated EMI can affect the motor driver 200 or surrounding equipment. The operational stability of the motor driver 200 or peripheral equipment (such as PLC or other host computers) can cause the motor driver 200 or peripheral equipment to malfunction. Therefore, a detection device is needed that can intuitively reflect the electromagnetic interference situation. The electromagnetic interference detection device 10 provided in this application can be set on the motor driver 200. Generally, the motor driver 200 includes a control printed circuit board and a drive printed circuit board. The control printed circuit board usually has a large number of electromagnetic interference-sensitive devices and / or circuits. Preferably, setting the electromagnetic interference detection device provided in this application on the control printed circuit board can more effectively monitor the impact of electromagnetic interference signals on the motor driver 200.

[0060] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. An electromagnetic interference detection device, applied to an electronic device, the electronic device comprising a target printed circuit board, the target printed circuit board having electromagnetic interference-sensitive devices and / or circuits disposed thereon, characterized in that, The electromagnetic interference detection device includes: a detection coil and a signal conditioning circuit, wherein the detection coil is electrically connected to the signal conditioning circuit. The detection coil is disposed on the target printed circuit board, and the detection coil at least surrounds the outer periphery of the device and / or circuit sensitive to electromagnetic interference; The signal conditioning circuit is used to process the induced voltage signal output by the detection coil and output an electromagnetic interference characterization signal. The electromagnetic interference characterization signal is used to characterize the electromagnetic interference intensity around the electromagnetic interference sensitive device and / or circuit.

2. The electromagnetic interference detection device according to claim 1, characterized in that, The detection coil is a trace on the printed circuit board of the target printed circuit board.

3. The electromagnetic interference detection device according to claim 2, characterized in that, The detection coil includes a single-turn or multi-turn coil, which is disposed on a single-layer copper foil surface and / or a multi-layer copper foil surface of the target printed circuit board.

4. The electromagnetic interference detection device according to any one of claims 1-3, characterized in that, The electromagnetic interference detection device further includes a resonant capacitor C1, which is connected in parallel to the beginning and end of the detection coil. The resonant capacitor C1 and the detection coil form a resonant frequency selection circuit, which is used to perform frequency selection processing on the induced voltage signal and output a frequency selection signal.

5. The electromagnetic interference detection device according to claim 4, characterized in that, The signal conditioning circuit includes a filtering and amplification module and a peak detection module. The input terminal of the filtering and amplification module is connected to the output terminal of the frequency selection circuit, and the output terminal of the filtering and amplification module is connected to the input terminal of the peak detection module. The filtering and amplification module is used to filter and amplify the frequency selection signal output by the frequency selection circuit, and the peak detection module is used to convert the high-frequency signal output by the filtering and amplification module into a low-frequency signal.

6. The electromagnetic interference detection device according to claim 5, characterized in that, The filtering and amplification module includes a first filtering and amplification unit, which is used to amplify and filter the frequency-selective signal and output a first sampling signal.

7. The electromagnetic interference detection device according to claim 6, characterized in that, The filtering and amplification module further includes a second filtering and amplification unit, which is used to further amplify and filter the first sampled signal and output a second sampled signal.

8. The electromagnetic interference detection device according to claim 7, characterized in that, The first filtering and amplification unit includes: a first operational amplifier U1, a first resistor R1, a second resistor R2, a second capacitor C2, and a third capacitor C3. The first terminal of the second capacitor C2 is connected to the first output terminal of the frequency selection circuit, the second terminal of the second capacitor C2 is connected to the first terminal of the first resistor R1, the second terminal of the first resistor R1 is connected to the inverting input terminal of the first operational amplifier U1, the non-inverting input terminal of the first operational amplifier U1 is connected to the second output terminal of the frequency selection circuit, and the second resistor R2 and the third capacitor C3 are connected in parallel between the inverting input terminal and the output terminal of the first operational amplifier U1, respectively. The second filtering and amplification unit includes: a second operational amplifier U2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a fourth capacitor C4. The fifth resistor R5 and the fourth capacitor C4 are connected in parallel to the inverting input and output of the second operational amplifier U2, respectively. The first end of the third resistor R3 is connected to the inverting input of the second operational amplifier U2, and the second end of the third resistor R3 is connected to signal ground. The first end of the fourth resistor R4 is connected to the output of the first operational amplifier U1, and the second end of the fourth resistor R4 is connected to the non-inverting input of the second operational amplifier U2.

9. The electromagnetic interference detection device according to claim 5, characterized in that, The peak detection module includes a diode D1, a fifth capacitor C5, and a sixth resistor R6. The anode of the diode D1 is connected to the output terminal of the filter amplification module, and the cathode of the diode D1 is connected to the output terminal of the peak detection module. The fifth capacitor C5 and the sixth resistor R6 are connected in parallel, with one end connected to the cathode of the diode D1 and the other end connected to signal ground.

10. The electromagnetic interference detection device according to claim 9, characterized in that, The signal conditioning circuit also includes an analog-to-digital converter module, which is used to convert the low-frequency signal output by the peak detection module from an analog quantity into a digital quantity.

11. The electromagnetic interference detection device according to claim 4, characterized in that, The electromagnetic interference detection device further includes a microprocessor module, the input of which is connected to the output of the signal conditioning circuit. The microprocessor module is used to determine the electromagnetic interference intensity around the electromagnetically sensitive device / circuit based on the electromagnetic interference characterization signal.

12. The electromagnetic interference detection device according to claim 11, characterized in that, The electromagnetic interference detection device further includes a display module, the input terminal of which is connected to the output terminal of the microprocessor module, and the display module is used to display the electromagnetic interference intensity around the electromagnetically sensitive device / circuit.

13. An electronic device, characterized in that, The electronic device includes the electromagnetic interference detection device according to any one of claims 1-12.

14. The electronic device according to claim 13, characterized in that, The electronic device is a motor driver.

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