Impedance measurement method, device and system for common mode inductance

Abstract

The present invention relates to the field of image data processing technology, and specifically to an impedance measurement method, device and system for common mode inductors, including: obtaining impedance measurement data of the common mode inductor to be detected, obtaining a sampling frequency band sequence of the common mode inductor to be detected, an impedance value sequence and an impedance value function corresponding to the sampling frequency band sequence, obtaining a representative value of each impedance value in the impedance value sequence according to the impedance value sequence and the impedance value function, determining the intermediate frequency band of the common mode inductor to be detected according to the representative value of the impedance value, obtaining a target frequency band range according to the intermediate frequency band, obtaining a target impedance value sequence and a target impedance value function curve according to the target frequency band range, determining the sweep frequency characteristics of the target frequency band range according to the extreme value distribution characteristics and impedance value of the target impedance value function curve, and determining the sweep frequency range of the common mode inductor to be detected according to the sweep frequency characteristics. The present invention adjusts and optimizes the sweep frequency range of the impedance analyzer, reduces the frequency band consumption, and improves the frequency band scanning efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of image data processing, and in particular to an impedance measurement method, device and system for common mode inductance. Background Art

[0002] Common-mode inductors are commonly used in electronic circuits, especially in power supply and signal transmission systems, to suppress common-mode noise. Among them, if the polarity of the signals is the same, such signals are called common-mode signals, and the signals are all differential-mode. Noise has both differential-mode and common-mode forms. If the noise is differential-mode, it overlaps with the signal and is generally indistinguishable. Therefore, common-mode signals are all noise signals. The main purpose of the corresponding common-mode inductor is to suppress noise, so its main function is to prevent high-frequency noise current from entering or out of the device, while allowing normal differential signals or DC currents to pass. Common-mode inductors are generally composed of two or more coils, which are tightly wound on the same magnetic core to ensure that they have the same response to external noise.

[0003] The impedance of the common-mode inductor presents different impedance characteristics under input signals of different frequency bands. By measuring the impedance of the common-mode inductor in different frequency bands, it can be verified whether the common-mode inductor can work effectively within a specific frequency range. This helps to select the appropriate common-mode inductor model and its parameter configuration during the design process. An impedance analyzer is usually used to analyze the impedance values ​​corresponding to different frequency bands of the common-mode inductor, but the impedance analyzer is used to scan all frequency bands of the common-mode inductor. However, not all impedance values ​​corresponding to all frequency bands of the common-mode inductor are referenceable. Scanning all frequency bands will affect the working efficiency of the impedance analyzer, and frequency bands that are not referenceable will also have a certain impact on the impedance analysis. Summary of the invention

[0004] The present invention provides an impedance measurement method, device and system for common mode inductance to solve the existing problems.

[0005] The present invention provides a common mode inductor impedance measurement method, device and system using the following technical solutions:

[0006] An embodiment of the present invention provides an impedance measurement method for common mode inductance, the method comprising the following steps:

[0007] An impedance measuring device is configured to obtain impedance measurement data of the common mode inductor to be detected, wherein the impedance measurement data includes a plurality of impedance values, each impedance value corresponding to a frequency band;

[0008] Obtain a sampling frequency band sequence of the common mode inductor to be detected, obtain an impedance value sequence and an impedance value function according to the sampling frequency band sequence, obtain a representative value of each impedance value in the impedance value sequence according to the impedance values ​​in the impedance value sequence and the change characteristics of the impedance values, and determine the intermediate frequency band of the common mode inductor to be detected according to the representative value of each impedance value;

[0009] Obtain a target frequency band range according to the intermediate frequency band, obtain a target impedance value sequence and a target impedance value function curve according to the target frequency band range, determine a frequency sweep feature of the target frequency band range according to extreme value distribution characteristics and impedance values ​​in the target impedance value function curve, and determine a frequency sweep range of the common mode inductor to be detected according to the frequency sweep feature of the target frequency band range;

[0010] The impedance of the common mode inductor to be detected is measured within the swept frequency range to obtain the impedance measurement result of the common mode inductor to be detected within the swept frequency range.

[0011] Further, the method of obtaining a representative value of each impedance value in the impedance value sequence according to the impedance values ​​in the impedance value sequence and the change characteristics of the impedance values, and determining the intermediate frequency band of the common mode inductance to be detected according to the representative value of each impedance value includes the following specific methods:

[0012] Obtain a subsequence in the impedance value sequence, and obtain a representative value of each impedance value in the impedance value sequence according to the impedance value in the impedance value sequence, the impedance value characteristics in the subsequence, and the derivative of the impedance value in the subsequence in the corresponding impedance value function;

[0013] The representative value of each impedance value in the impedance value sequence is calculated, and the maximum representative value is obtained, corresponding to the typical application type of the common-mode inductor to be detected, and the frequency band of the impedance value corresponding to the maximum impedance representative value is used as the mid-frequency band of the common-mode inductor to be detected.

[0014] Furthermore, the specific calculation method of the representative value of each impedance value in the impedance value sequence is:

[0015] ;

[0016] In the formula, Indicates the impedance value sequence A representative value of impedance value; Indicates the impedance value sequence The size of the impedance value; represents the number of impedance values ​​in the subsequence; Represents the representative value factor.

[0017] Furthermore, the specific calculation method of the representative value factor is:

[0018] ;

[0019] In the formula, Indicates the subsequence The size of the impedance value; Indicates the subsequence The derivative of an impedance value in the corresponding impedance value function; Indicates the subsequence The size of the impedance value; Indicates the subsequence The derivative of an impedance value in the corresponding impedance value function.

[0020] Furthermore, the specific calculation method of the frequency sweep characteristic of the target frequency band range is:

[0021] ;

[0022] In the formula, Indicates the sweep characteristics of the target frequency band; Indicates the number of extreme value points in the target impedance value function curve; Indicates the number of intervals consisting of extreme value points in the target impedance value function curve; Indicates the target impedance value function curve The number of impedance values ​​in an interval; Indicates In the interval The size of the impedance value.

[0023] Furthermore, the method of obtaining a sampling frequency band sequence of the common mode inductance to be detected and obtaining an impedance value sequence and an impedance value function according to the sampling frequency band sequence includes the following specific methods:

[0024] The impedance values ​​of the common-mode inductor to be detected in different frequency bands are sampled and analyzed, and the frequency band of the common-mode inductor to be detected is sampled at intervals with a preset interval parameter to obtain a sampling frequency band sequence of the common-mode inductor to be detected. The sequence composed of the impedance values ​​corresponding to each frequency band in the sampling frequency band sequence is recorded as an impedance value sequence, and the impedance value sequence is fitted using the least squares method to obtain a corresponding continuous function, which is recorded as an impedance value function.

[0025] Furthermore, the method of obtaining the target frequency range according to the intermediate frequency range, and obtaining the target impedance value sequence and the target impedance value function curve according to the target frequency range includes the following specific methods:

[0026] Taking the minimum sampling frequency band of the impedance analyzer as the interval, the target frequency band range is obtained according to the intermediate frequency band and the preset second parameter, and the corresponding impedance value sequence is obtained according to the impedance value corresponding to each frequency band in the target frequency band range, which is recorded as the target impedance value sequence. The target impedance value sequence is fitted by the least squares method to obtain the corresponding continuous function curve, which is recorded as the target impedance value function curve.

[0027] Furthermore, the method of determining the frequency sweep range of the common mode inductor to be detected according to the frequency sweep characteristics of the target frequency band range includes the following specific methods:

[0028] The target frequency band range is adjusted according to the preset adjustment parameters, the frequency sweeping characteristics of the target frequency band range after each adjustment are obtained, and the target frequency band range corresponding to the maximum value of the frequency sweeping characteristics is used as the frequency sweeping range of the common mode inductor to be detected.

[0029] An impedance measurement system for common mode inductors, using any one of the impedance measurement methods for common mode inductors, the system comprising the following modules:

[0030] A data acquisition module, used to configure an impedance measurement device to acquire impedance measurement data of the common mode inductor to be detected, wherein the impedance measurement data includes a plurality of impedance values, each impedance value corresponding to a frequency band;

[0031] An intermediate frequency band determination module is used to obtain a sampling frequency band sequence of the common mode inductor to be detected, obtain an impedance value sequence and an impedance value function according to the sampling frequency band sequence, obtain a representative value of each impedance value in the impedance value sequence according to the impedance values ​​in the impedance value sequence and the impedance value change characteristics, and determine the intermediate frequency band of the common mode inductor to be detected according to the representative value of each impedance value;

[0032] A frequency sweep range determination module is used to obtain a target frequency range according to an intermediate frequency band, obtain a target impedance value sequence and a target impedance value function curve according to the target frequency range, determine a frequency sweep feature of the target frequency range according to extreme value distribution characteristics and impedance values ​​in the target impedance value function curve, and determine a frequency sweep range of the common mode inductor to be detected according to the frequency sweep feature of the target frequency range;

[0033] The impedance measurement module is used to perform impedance measurement on the swept frequency range of the common mode inductor to be detected, and obtain the impedance measurement result of the common mode inductor to be detected.

[0034] An impedance measurement device for common mode inductance includes an impedance analyzer, a memory and a processor included in the impedance analyzer, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, any one of the steps of the impedance measurement method for common mode inductance is implemented.

[0035] The beneficial effects of the technical solution of the present invention are: obtaining a sampling frequency band sequence of a common-mode inductor to be detected, obtaining an impedance value sequence and an impedance value function according to the sampling frequency band sequence, obtaining a representative value of each impedance value in the impedance value sequence according to the impedance values ​​in the impedance value sequence and the impedance value change characteristics, determining the intermediate frequency band of the common-mode inductor to be detected according to the representative value of each impedance value, preliminarily locating the scanning frequency band position of the common-mode inductor to be detected, obtaining a target frequency band range according to the intermediate frequency band, obtaining a target impedance value sequence and a target impedance value function curve according to the target frequency band range, determining the frequency sweeping characteristics of the target frequency band range according to the extreme value distribution characteristics and impedance values ​​in the target impedance value function curve, determining the frequency sweeping range of the common-mode inductor to be detected according to the frequency sweeping characteristics of the target frequency band range, measuring the impedance of the common-mode inductor to be detected according to the determined frequency sweeping range, reducing the impedance measurement to scan other frequency bands, reducing frequency band consumption, improving the frequency band scanning efficiency, and accurately scanning the frequency band range. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A flowchart of the steps of an impedance measurement method for common mode inductance of the present invention;

[0038] Figure 2 A structural block diagram of an impedance measurement system for common mode inductance of the present invention;

[0039] Figure 3 The structure block diagram of an impedance measurement device for common mode inductance of the present invention. DETAILED DESCRIPTION

[0040] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the impedance measurement method, device and system for common mode inductance proposed by the present invention, its specific implementation method, structure, features and effects in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0041] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0042] The following describes in detail a specific scheme of an impedance measurement method, device and system for common mode inductors provided by the present invention in conjunction with the accompanying drawings.

[0043] See also Figure 1 , which shows a flowchart of a method for measuring impedance of a common mode inductor provided by an embodiment of the present invention, the method comprising the following steps:

[0044] Step S001: configure an impedance measurement device to obtain impedance measurement data of a common mode inductor to be detected, wherein the impedance measurement data includes a plurality of impedance values, each impedance value corresponding to a frequency band.

[0045] In order to implement the impedance measurement method for common mode inductance proposed in this embodiment, it is first necessary to configure an impedance measurement device to obtain impedance measurement data. The specific process is as follows:

[0046] The common-mode inductor to be tested is connected to the impedance analyzer by using a test fixture, and the frequency band of the impedance analyzer is adjusted to obtain the impedance value of the common-mode inductor to be tested under different frequency bands.

[0047] So far, the impedance values ​​of the common mode inductor to be detected in different frequency bands are obtained through the above method.

[0048] Step S002, obtaining a sampling frequency band sequence of the common-mode inductor to be detected, obtaining an impedance value sequence and an impedance value function according to the sampling frequency band sequence, obtaining a representative value of each impedance value in the impedance value sequence according to the impedance values ​​in the impedance value sequence and the impedance value change characteristics, and determining the intermediate frequency band of the common-mode inductor to be detected according to the representative value of each impedance value.

[0049] It should be noted that in order to more accurately determine the frequency sweep range of the common-mode inductor to be detected, it is first necessary to determine the intermediate frequency band of the common-mode inductor to be detected, so as to have a preliminary understanding of the range of the frequency sweep area of ​​the common-mode inductor to be detected.

[0050] Specifically, the impedance values ​​of the common mode inductor to be tested in different frequency bands are sampled and analyzed. To sample the frequency band of the common mode inductor to be detected at intervals, and obtain a sampling frequency band sequence , each frequency band in the sampling frequency band sequence corresponds to an impedance value, thus obtaining the corresponding impedance value sequence , the impedance value sequence is fitted using the least squares method to obtain a corresponding continuous function, which is recorded as the impedance value function.

[0051] It should be noted that is the preset interval parameter, preset based on experience The value of , which can be adjusted according to actual conditions and is not limited in this embodiment.

[0052] A subsequence in the impedance value sequence is obtained, and a representative value of each impedance value in the impedance value sequence is obtained according to the impedance value in the impedance value sequence, the impedance value characteristics in the subsequence, and the derivative of the impedance value in the subsequence in the corresponding impedance value function.

[0053] As an example, the impedance value sequence The specific calculation method of the representative value of an impedance value is:

[0054] ;

[0055] ;

[0056] In the formula, Indicates the impedance value sequence A representative value of impedance value; Indicates the impedance value sequence The size of the impedance value; represents the number of impedance values ​​in the subsequence; Indicates the subsequence The size of the impedance value; Indicates the subsequence The derivative of an impedance value in the corresponding impedance value function; Indicates the subsequence The size of the impedance value; Indicates the subsequence The derivative of an impedance value in the corresponding impedance value function.

[0057] It should be noted that Used to analyze the change degree of impedance value corresponding to different frequency bands. The larger the value, the greater the change in the impedance value corresponding to the adjacent frequency band. The larger the representative value of an impedance value, the more sensitive the impedance is to the change of the signal frequency band, the clearer the effective working range of the common mode inductor to be detected is, and under the same frequency band, The larger the value, the The representative value of an impedance value is larger.

[0058] It should be noted that the value range of the subsequence is , The first parameter is preset based on experience. The value of is 3, which can be adjusted according to actual conditions and is not limited in this embodiment.

[0059] Calculate the representative value of each impedance value in the impedance value sequence, obtain the largest representative value, and use the impedance value frequency band corresponding to the largest representative value as the mid-frequency band of the common mode inductance to be detected. express.

[0060] So far, the intermediate frequency band of the common mode inductor to be detected is obtained through the above steps.

[0061] Step S003, obtaining a target frequency band range according to the intermediate frequency band, obtaining a target impedance value sequence and a target impedance value function curve according to the target frequency band range, determining a frequency sweeping characteristic of the target frequency band range according to the extreme value distribution characteristics and impedance values ​​in the target impedance value function curve, and determining a frequency sweeping range of the common mode inductance to be detected according to the frequency sweeping characteristic of the target frequency band range.

[0062] It should be noted that after obtaining the intermediate frequency band of the common-mode inductor to be detected, it is necessary to further determine its frequency sweep range, that is, determine the starting frequency band and the ending frequency band of the common-mode inductor to be detected. The frequency sweep range of the common-mode inductor to be detected can be determined by analyzing the interference sensitivity of the common-mode inductor to be detected.

[0063] It should be noted that interference sensitivity is used to indicate the frequency bands in which the common-mode inductor to be detected is most sensitive. The interference sensitivity of different frequency bands is different. In a certain frequency band in the high impedance area, if the impedance of the common-mode inductor to be detected is continuously high, it means that the common-mode inductor to be detected has weak resistance to external signals in the current frequency band, that is, the interference sensitivity of the common-mode inductor to be detected in the current frequency band is low. In the impedance peak, the peak usually corresponds to the resonance point of the common-mode inductor to be detected. The resonance point is more sensitive and susceptible to interference. The higher the impedance peak and the more corresponding peaks, the greater the interference sensitivity of the current frequency band.

[0064] Specifically, the minimum sampling frequency band of the impedance analyzer is used as the interval, and the target frequency band range is obtained according to the intermediate frequency band, that is, According to the impedance value of each frequency band in the target frequency band range, the corresponding impedance value sequence is obtained, which is recorded as the target impedance value sequence The target impedance value sequence is fitted by the least square method to obtain the corresponding continuous function curve, which is recorded as the target impedance value function curve. The frequency sweep characteristics of the target frequency band are determined according to the impedance values ​​in the corresponding sequence between the extreme points of the target impedance value function curve, the number of extreme points and the total number of intervals formed by the extreme points.

[0065] It should be noted that The second parameter is preset based on experience The value of , can be modified according to actual conditions, and this embodiment does not limit it.

[0066] As an embodiment, a specific method for calculating the frequency sweep characteristic of the target frequency band is as follows:

[0067] ;

[0068] In the formula, Indicates the sweep characteristics of the target frequency band; Indicates the number of extreme value points in the target impedance value function curve; Indicates the number of intervals consisting of extreme value points in the target impedance value function curve; Indicates the target impedance value function curve The number of impedance values ​​in an interval; Indicates In the interval The size of the impedance value.

[0069] It should be noted that if the impedance of the common-mode inductor to be detected is always high within a certain frequency band, it means that its resistance to external signals in the current frequency band is weak. The interference sensitivity of the common-mode inductor to be detected in the current frequency band is high, and the corresponding frequency sweep characteristic is higher, that is, The bigger the The larger the value, the more extreme points there are in the current frequency band, that is, the more resonance points there are, the more susceptible to interference, and the higher the interference sensitivity of the current frequency band, that is, The bigger the Also bigger.

[0070] Adjust the target frequency band range, the preset adjustment parameters are , No. The target frequency band range after adjustment is , obtaining the frequency sweep characteristics of the target frequency band range after each adjustment, and taking the target frequency band range corresponding to the maximum value of the frequency sweep characteristics as the frequency sweep range of the common mode inductor to be detected.

[0071] It should be noted that based on experience The value of , which can be adjusted according to actual conditions and is not limited in this embodiment.

[0072] Step S004 , performing impedance measurement on the sweep frequency range of the common mode inductor to be detected, and obtaining an impedance measurement result of the common mode inductor to be detected.

[0073] The frequency sweep range of the common mode inductor to be detected is used as the optimal frequency range for measuring the impedance of the common mode inductor to be detected, and the impedance of the optimal frequency range is measured to obtain the impedance measurement result of the common mode inductor to be detected. By the above method, the impedance measurement of the common mode inductor to be detected is completed.

[0074] Second, see Figure 2 , which shows an impedance measurement system for common mode inductance, the system includes the following modules:

[0075] A data acquisition module, used to configure an impedance measurement device to acquire impedance measurement data of the common mode inductor to be detected, wherein the impedance measurement data includes a plurality of impedance values, each impedance value corresponding to a frequency band;

[0076] An intermediate frequency band determination module is used to obtain a sampling frequency band sequence of the common mode inductor to be detected, obtain an impedance value sequence and an impedance value function according to the sampling frequency band sequence, obtain a representative value of each impedance value in the impedance value sequence according to the impedance values ​​in the impedance value sequence and the impedance value change characteristics, and determine the intermediate frequency band of the common mode inductor to be detected according to the representative value of each impedance value;

[0077] A frequency sweep range determination module is used to obtain a target frequency range according to an intermediate frequency band, obtain a target impedance value sequence and a target impedance value function curve according to the target frequency range, determine a frequency sweep feature of the target frequency range according to extreme value distribution characteristics and impedance values ​​in the target impedance value function curve, and determine a frequency sweep range of the common mode inductor to be detected according to the frequency sweep feature of the target frequency range;

[0078] The impedance measurement module is used to perform impedance measurement on the swept frequency range of the common mode inductor to be detected, and obtain the impedance measurement result of the common mode inductor to be detected.

[0079] Third, see Figure 3 The present invention also proposes an impedance measurement device for common-mode inductance, which includes an impedance analyzer and a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method described in steps S001 to S004 are implemented.

[0080] In this embodiment, a sampling frequency band sequence of the common-mode inductor to be detected is obtained, an impedance value sequence and an impedance value function are obtained according to the sampling frequency band sequence, a representative value of each impedance value in the impedance value sequence is obtained according to the impedance values ​​in the impedance value sequence and the change characteristics of the impedance values, an intermediate frequency band of the common-mode inductor to be detected is determined according to the representative value of each impedance value, a scanning frequency band position of the common-mode inductor to be detected is preliminarily located, a target frequency band range is obtained according to the intermediate frequency band, a target impedance value sequence and a target impedance value function curve are obtained according to the target frequency band range, a scanning frequency feature of the target frequency band range is determined according to the extreme value distribution characteristics and the impedance values ​​in the target impedance value function curve, a scanning frequency range of the common-mode inductor to be detected is determined according to the scanning frequency feature of the target frequency band range, and the impedance of the common-mode inductor to be detected is measured according to the determined scanning frequency range, so as to reduce the impedance measurement to scan other frequency band ranges, reduce the frequency band consumption, improve the scanning efficiency of the frequency band, and accurately scan the frequency band range.

[0081] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An impedance measurement method for common mode inductance, characterized in that: The method comprises the following steps: An impedance measuring device is configured to obtain impedance measurement data of the common mode inductor to be detected, wherein the impedance measurement data includes a plurality of impedance values, each impedance value corresponding to a frequency band; Obtain a sampling frequency band sequence of the common mode inductor to be detected, obtain an impedance value sequence and an impedance value function according to the sampling frequency band sequence, obtain a representative value of each impedance value in the impedance value sequence according to the impedance values ​​in the impedance value sequence and the change characteristics of the impedance values, and determine the intermediate frequency band of the common mode inductor to be detected according to the representative value of each impedance value; Obtain a target frequency band range according to the intermediate frequency band, obtain a target impedance value sequence and a target impedance value function curve according to the target frequency band range, determine a frequency sweep feature of the target frequency band range according to extreme value distribution characteristics and impedance values ​​in the target impedance value function curve, and determine a frequency sweep range of the common mode inductor to be detected according to the frequency sweep feature of the target frequency band range; Perform impedance measurement on the swept frequency range of the common mode inductor to be detected, and obtain the impedance measurement result of the common mode inductor to be detected under the swept frequency range; The specific calculation method of the frequency sweep characteristic of the target frequency band is: ； In the formula, Indicates the sweep characteristics of the target frequency band; Indicates the number of extreme value points in the target impedance value function curve; Indicates the number of intervals consisting of extreme value points in the target impedance value function curve; Indicates the target impedance value function curve The number of impedance values ​​in an interval; Indicates In the interval The size of the impedance value.

2. The impedance measurement method for common mode inductance according to claim 1, characterized in that: The method of obtaining a representative value of each impedance value in the impedance value sequence according to the impedance values ​​in the impedance value sequence and the change characteristics of the impedance values, and determining the intermediate frequency band of the common mode inductance to be detected according to the representative value of each impedance value, includes the following specific methods: Obtain a subsequence in the impedance value sequence, and obtain a representative value of each impedance value in the impedance value sequence according to the impedance value in the impedance value sequence, the impedance value characteristics in the subsequence, and the derivative of the impedance value in the subsequence in the corresponding impedance value function; The representative value of each impedance value in the impedance value sequence is calculated, and the maximum representative value is obtained, corresponding to the typical application type of the common-mode inductor to be detected, and the frequency band of the impedance value corresponding to the maximum impedance representative value is used as the mid-frequency band of the common-mode inductor to be detected.

3. The impedance measurement method for common mode inductance according to claim 2, characterized in that: The specific calculation method of the representative value of each impedance value in the impedance value sequence is: ； In the formula, Indicates the impedance value sequence A representative value of impedance value; Indicates the impedance value sequence The size of the impedance value; represents the number of impedance values ​​in the subsequence; Represents the representative value factor.

4. The impedance measurement method for common mode inductance according to claim 3, characterized in that: The specific calculation method of the representative value factor is: ； In the formula, Indicates the first The size of the impedance value; Indicates the first The derivative of an impedance value in the corresponding impedance value function; Indicates the subsequence The size of the impedance value; Indicates the first The derivative of an impedance value in the corresponding impedance value function.

5. The impedance measurement method for common mode inductance according to claim 1, characterized in that: The method of obtaining a sampling frequency band sequence of the common mode inductance to be detected and obtaining an impedance value sequence and an impedance value function according to the sampling frequency band sequence includes the following specific methods: The impedance values ​​of the common-mode inductor to be detected in different frequency bands are sampled and analyzed, and the frequency band of the common-mode inductor to be detected is sampled at intervals with a preset interval parameter to obtain a sampling frequency band sequence of the common-mode inductor to be detected. The sequence composed of the impedance values ​​corresponding to each frequency band in the sampling frequency band sequence is recorded as an impedance value sequence, and the impedance value sequence is fitted using the least squares method to obtain a corresponding continuous function, which is recorded as an impedance value function.

6. The impedance measurement method for common mode inductance according to claim 1, characterized in that: The specific method of obtaining the target frequency range according to the intermediate frequency range and obtaining the target impedance value sequence and the target impedance value function curve according to the target frequency range is as follows: Taking the minimum sampling frequency band of the impedance analyzer as the interval, the target frequency band range is obtained according to the intermediate frequency band and the preset second parameter, and the corresponding impedance value sequence is obtained according to the impedance value corresponding to each frequency band in the target frequency band range, which is recorded as the target impedance value sequence. The target impedance value sequence is fitted by the least squares method to obtain the corresponding continuous function curve, which is recorded as the target impedance value function curve.

7. The impedance measurement method for common mode inductance according to claim 1, characterized in that: The specific method of determining the frequency sweep range of the common mode inductor to be detected according to the frequency sweep characteristics of the target frequency band range is as follows: The target frequency band range is adjusted according to the preset adjustment parameters, the frequency sweeping characteristics of the target frequency band range after each adjustment are obtained, and the target frequency band range corresponding to the maximum value of the frequency sweeping characteristics is used as the frequency sweeping range of the common mode inductor to be detected.

8. An impedance measurement system for common mode inductors, using an impedance measurement method for common mode inductors as claimed in any one of claims 1 to 7, characterized in that: The system includes the following modules: A data acquisition module, used to configure an impedance measurement device to acquire impedance measurement data of the common mode inductor to be detected, wherein the impedance measurement data includes a plurality of impedance values, each impedance value corresponding to a frequency band; An intermediate frequency band determination module is used to obtain a sampling frequency band sequence of the common mode inductor to be detected, obtain an impedance value sequence and an impedance value function according to the sampling frequency band sequence, obtain a representative value of each impedance value in the impedance value sequence according to the impedance values ​​in the impedance value sequence and the impedance value change characteristics, and determine the intermediate frequency band of the common mode inductor to be detected according to the representative value of each impedance value; A frequency sweep range determination module is used to obtain a target frequency range according to an intermediate frequency band, obtain a target impedance value sequence and a target impedance value function curve according to the target frequency range, determine a frequency sweep feature of the target frequency range according to extreme value distribution characteristics and impedance values ​​in the target impedance value function curve, and determine a frequency sweep range of the common mode inductor to be detected according to the frequency sweep feature of the target frequency range; The impedance measurement module is used to perform impedance measurement on the swept frequency range of the common mode inductor to be detected, and obtain the impedance measurement result of the common mode inductor to be detected.

9. An impedance measurement device for common mode inductance, comprising an impedance analyzer, a memory contained in the impedance analyzer, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

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