CN108694284B - Calculation method, system, device and storage medium for parameters of filter - Google Patents

Abstract

The invention discloses a method, a system, equipment and a storage medium for calculating parameters of a filter, which comprises the following steps: according to the value of common-mode insertion loss

Exceeding cut-off frequency value f^*And common mode inductance value L_CMCalculating the common-mode capacitance C_CM(ii) a According to the value of differential mode insertion loss

Exceeding cut-off frequency value f^*Sum and difference mode capacitance C_DMCalculating the differential-mode inductance L_DM(ii) a According to the common-mode capacitance value C_CMSum and difference mode inductance L_DMAnd designing parameters of the filter. According to the method, the system, the equipment and the storage medium for calculating the parameters of the filter, the common-mode capacitance value and the differential-mode inductance value are obtained through calculation respectively, so that the parameters of the filter are designed according to the common-mode capacitance value and the differential-mode inductance value, the parameter effectiveness of the filter is improved, and the failure of the filter due to impedance change caused by a nonlinear device in the system during working is prevented.

Description

Calculation method, system, device and storage medium for parameters of filter

technical field

The present invention relates to the field of filters, in particular to a method, system, device and storage medium for calculating parameters of a filter.

Background technique

With the continuous development of semiconductor materials, the switching frequency of power switch tubes used in power electronic systems is getting higher and higher. Although the efficiency of the system is improved to a certain extent, it also leads to a sharp increase in the conducted electromagnetic interference in the system, which cannot be ignored. It can be effectively suppressed by designing an electromagnetic interference filter. However, there is still no perfect theoretical basis for the design of passive electromagnetic interference filters. Generally, the design is carried out on the basis of certain experience, and the nonlinear characteristics of the system impedance are basically ignored. Even if it is recognized, it is not very good method to solve. The design of the conducted electromagnetic interference filter in the grid-connected inverter is based on the limit value of the corresponding standard and the measured value of the system to obtain the due insertion loss, and does not consider the nonlinear impedance of the noise source to passive filter. the effect of the insertion loss of the device.

The traditional electromagnetic interference filter is ideally designed according to the demand value of insertion loss obtained by measurement and comparison. The filter fails due to the impedance change caused by the nonlinear device in the system during operation. Electromagnetic The validity of the parameters of the interference filter is low.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a method, system, device and storage medium for calculating the parameters of the filter, so as to improve the effectiveness of the parameters of the filter.

The present invention proposes a method for calculating parameters of a filter, comprising the steps of:

超标截止频率值f^*和共模电感值L_CM计算出共模电容值C_CM；According to common mode insertion loss value

The common-mode capacitance value C _CM is calculated from the over-standard cut-off frequency value f ^* and the common-mode inductance value L _CM ;

超标截止频率值f^*和差模电容值C_DM计算出差模电感值L_DM；According to differential mode insertion loss value

The differential mode inductance value L _DM is calculated from the excess cut-off frequency value f ^* and the differential mode capacitance value C _DM ;

The parameters of the filter are designed according to the above-mentioned common-mode capacitance value C _CM and the above-mentioned differential-mode inductance value L _DM .

上述超标截止频率值f^*和上述共模电感值L_CM计算出上述共模电容值C_CM的步骤之前，还包括步骤：Further, in the method for calculating the parameters of the filter, the above-mentioned common mode insertion loss value is

Before the step of calculating the above-mentioned common-mode capacitance value C _CM from the above-mentioned excessive cut-off frequency value f ^* and the above-mentioned common-mode inductance value L _CM , the following steps are further included:

和上述超标截止频率值f^*计算出上述共模电感值L_CM。According to the equivalent impedance value Z _sCM of the common mode noise source, the above common mode insertion loss value

and the above-mentioned excess cut-off frequency value f ^* to calculate the above-mentioned common-mode inductance value L _CM .

和上述超标截止频率值f^*计算出上述共模电感值L_CM的步骤之前，还包括步骤：Further, in the method for calculating the parameters of the filter, in the above-mentioned equivalent impedance value Z _sCM of the common-mode noise source, the above-mentioned common-mode insertion loss value

and the above-mentioned excess cut-off frequency value f ^* , before calculating the above-mentioned common-mode inductance value L _CM , it also includes the following steps:

计算出接入滤波器前后传输到负载的共模噪声低电压比值

According to the above common mode insertion loss value

Calculate the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected

共模电感阻抗值Z_fCM和线性阻抗稳定网络对于共模滤波器传导模型的等效阻抗值R_loadCM计算出上述共模噪声源的等效电阻值Z_sCM。According to the above-mentioned low voltage ratio of common mode noise transmitted to the load before and after the filter is connected

The common mode inductor impedance value Z _fCM and the equivalent impedance value R _loadCM of the linear impedance stabilization network for the common mode filter conduction model calculate the equivalent resistance value Z _sCM of the above common mode noise source.

共模电感阻抗值Z_fCM和线性阻抗稳定网络对于共模滤波器传导模型的等效阻抗值R_loadCM计算出上述共模噪声源的等效电阻值Z_sCM的步骤之前，还包括步骤：Further, in the method for calculating the parameters of the above-mentioned filter, the low-voltage ratio of the common mode noise transmitted to the load before and after the above-mentioned access filter is described above.

The common mode inductor impedance value Z _fCM and the equivalent impedance value R _loadCM of the linear impedance stabilization network for the conduction model of the common mode filter Before the step of calculating the equivalent resistance value Z _sCM of the above common mode noise source, it also includes the following steps:

和上述线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值R_loadCM建立上述共模滤波器传导模型及其目标函数：According to the above-mentioned low voltage ratio of common mode noise transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadCM of the above-mentioned common-mode filter conduction model to establish the above-mentioned common-mode filter conduction model and its objective function:

为接入滤波器前后传输到负载的共模噪声低电压比值，R_loadCM为线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值，Z_sCM为共模噪声源的等效电阻值，Z_fCM为共模电感阻抗值。In the formula,

is the low-voltage ratio of common mode noise transmitted to the load before and after the filter is connected, R _loadCM is the equivalent impedance value of the linear impedance stabilization network for the above-mentioned common mode filter conduction model, and Z _sCM is the equivalent resistance value of the common mode noise source , Z _fCM is the impedance value of the common mode inductor.

上述超标截止频率值f^*和上述差模电容值C_DM计算出上述差模电感值L_DM的步骤之前，还包括步骤：Further, in the method for calculating the parameters of the above-mentioned filter, in the above-mentioned method according to the above-mentioned differential mode insertion loss value

Before the step of calculating the above-mentioned differential mode inductance value L _DM with the above-mentioned excessive cut-off frequency value f ^* and the above-mentioned differential-mode capacitance value C _DM , the following steps are further included:

和超标截止频率值f^*计算出差模电容值C_DM。According to the equivalent impedance value Z _sDM of the differential mode noise source, the differential mode insertion loss value

and the excess cutoff frequency value f ^* to calculate the differential mode capacitance value C _DM .

和超标截止频率值f^*计算差模电容值C_DM的步骤之前，还包括步骤：Further, in the method for calculating the parameters of the filter, in the above-mentioned equivalent impedance value Z _sDM of the differential mode noise source, the differential mode insertion loss value

And before the step of calculating the differential mode capacitance value C _DM , the excess cutoff frequency value f ^* also includes the steps:

计算出接入滤波器前后传输到负载的差模噪声低电压比值

According to the above differential mode insertion loss value

Calculate the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected

差模电容阻抗值Z_fDM和线性阻抗稳定网络对于差模滤波器传导模型的等效阻抗值R_loadDM计算出上述差模噪声源的等效电阻值Z_sDM。According to the ratio of differential mode noise and low voltage transmitted to the load before and after the filter is connected

The differential mode capacitor impedance value Z _fDM and the equivalent impedance value R _loadDM of the differential mode filter conduction model of the linear impedance stabilization network are used to calculate the equivalent resistance value Z _sDM of the differential mode noise source.

差模电容阻抗值Z_fDM和线性阻抗稳定网络对于差模滤波器传导模型的等效阻抗值R_loadDM计算出上述差模噪声源的等效电阻值Z_sDM的步骤之前，还包括步骤：Further, in the method for calculating the parameters of the above-mentioned filter, the differential mode noise low-voltage ratio transmitted to the load before and after the above-mentioned access filter according to the above

The differential mode capacitor impedance value Z _fDM and the linear impedance stabilization network are based on the equivalent impedance value R _loadDM of the differential mode filter conduction model. Before the step of calculating the equivalent resistance value Z _sDM of the differential mode noise source, the steps further include:

和上述线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值R_loadDM建立上述差模滤波器传导模型及其目标函数：According to the ratio of differential mode noise and low voltage transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadDM of the above-mentioned differential-mode filter conduction model to establish the above-mentioned differential-mode filter conduction model and its objective function:

为接入滤波器前后传输到负载的差模噪声低电压比值，R_loadDM为线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值，Z_sDM为差模噪声源的等效电阻值，Z_fDM为差模电容阻抗值。In the formula,

is the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected, R _loadDM is the equivalent impedance value of the linear impedance stabilization network for the conduction model of the differential mode filter, Z _sDM is the equivalent resistance value of the differential mode noise source , Z _fDM is the impedance value of the differential mode capacitor.

The present invention also proposes a system for calculating parameters of a filter, comprising:

a common mode capacitance value calculation module, used for calculating the common mode capacitance value C _CM according to the common mode insertion loss value IL _rCM , the over-standard cut-off frequency value f ^* and the common mode inductance value L _CM ;

The differential mode inductance value calculation module is used to calculate the differential mode inductance value L _DM according to the differential mode insertion loss value IL _rDM , the over-standard cut-off frequency value f ^* and the differential mode capacitance value C _DM ;

The parameter design module is used to design the parameters of the filter according to the above-mentioned common-mode capacitance value C _CM and the above-mentioned differential-mode inductance value L _DM .

The present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and running on the processor. The processor implements the method described in any one of the embodiments when the processor executes the program.

The present invention also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the method described in any one of the embodiments.

In the method, system, equipment and storage medium for calculating parameters of a filter of the present invention, the common-mode capacitance value and the differential-mode inductance value are obtained by calculating respectively, so that the parameters of the filter are designed according to the common-mode capacitance value and the differential-mode inductance value, thereby improving the The validity of the parameters of the filter prevents the filter from failing due to impedance changes caused by nonlinear devices in the system during operation; and by calculating the value of the common mode inductance and the value of the differential mode capacitor, considering the equivalent of the common mode noise source The influence of impedance value and common mode insertion loss value on the common mode inductance value, and considering the influence of the equivalent impedance value of the differential mode noise source and the differential mode insertion loss value on the differential mode capacitance value, so that the filter can operate in the corresponding frequency band. It has filtering effect and improves the effectiveness of the parameters of the filter; and, by calculating the equivalent resistance value of the common mode noise source and the equivalent resistance value of the differential mode noise source, according to the equivalent resistance of the common mode noise source The parameters of the filter are designed according to the equivalent resistance value of the differential mode noise source and the equivalent resistance value of the differential mode noise source, so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved.

Description of drawings

1 is a schematic flowchart of a method for calculating parameters of a filter according to an embodiment of the present invention;

2 is a schematic flowchart of a method for calculating parameters of a filter according to an embodiment of the present invention;

3 is a schematic flowchart of a method for calculating parameters of a filter according to an embodiment of the present invention;

4 is a schematic structural diagram of a common-mode filter conduction model of a method for calculating parameters of a filter according to an embodiment of the present invention;

5 is a schematic structural diagram of a differential mode filter conduction model of a method for calculating parameters of a filter according to an embodiment of the present invention;

6 is a schematic structural diagram of a system for calculating parameters of a filter according to an embodiment of the present invention;

7 is a schematic structural diagram of a computer device according to an embodiment of the present invention;

8 is a schematic structural diagram of a transmission common mode filter conduction model according to an embodiment of the present invention;

FIG. 9 is a schematic structural diagram of a differential mode filter conduction model of a transmission according to an embodiment of the present invention.

1. Common-mode capacitance value calculation module; 2. Differential-mode inductance value calculation module; 3. Parameter design module; 4. Computer equipment; 5. External equipment; 6. Processing unit; 7. Bus; 8. Network adapter; 9. ( 10, display; 11, system memory; 12, random access memory (RAM); 13, cache memory; 14, storage system; 15, programs/utilities; 16, program modules.

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

It should be noted that the technical solutions between the various embodiments can be combined with each other, but it must be based on the realization by those of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exists, and it is not within the protection scope of the present invention.

1 , in an embodiment of the present invention, a method for calculating parameters of a filter is proposed, including the steps:

超标截止频率值f^*和共模电感值L_CM计算出共模电容值C_CM；S1, according to the common mode insertion loss value

The common-mode capacitance value C _CM is calculated from the over-standard cut-off frequency value f ^* and the common-mode inductance value L _CM ;

超标截止频率值f^*和差模电容值C_DM计算出差模电感值L_DM；S2, according to the differential mode insertion loss value

The differential mode inductance value L _DM is calculated from the excess cut-off frequency value f ^* and the differential mode capacitance value C _DM ;

S3. Design the parameters of the filter according to the above-mentioned common-mode capacitance value C _CM and the above-mentioned differential-mode inductance value L _DM .

超标截止频率值f^*和共模电感值L_CM通过公式：

计算出共模电容值C_CM，从而得到在该频段的有效的上述共模电容值C_CM，根据上述共模电容值C_CM设计滤波器的参数，提高滤波器的参数的有效性，防止滤波器因阻抗变化而失效。As in the above step S1, according to the common mode insertion loss value

Exceeded cutoff frequency value f ^* and common mode inductance value L _CM by formula:

Calculate the common-mode capacitance value C _CM , so as to obtain the effective common-mode capacitance value C _{CM in this frequency band, and design the parameters of the filter according to the above-mentioned common-mode capacitance value C CM to} improve the effectiveness of the parameters of the filter and prevent filtering The device fails due to impedance changes.

超标截止频率值f^*和差模电容值C_DM通过公式：

计算出差模电感值L_DM，从而得到在该频段的有效的上述差模电感值L_DM，根据上述差模电感值L_DM设计滤波器的参数，提高滤波器的参数的有效性，防止滤波器因阻抗变化而失效。As in the above step S2, according to the differential mode insertion loss value

The excess cut-off frequency value f ^* and the differential mode capacitance value C _DM are obtained by the formula:

Calculate the differential mode inductance value L _DM , so as to obtain the effective differential mode inductance value L _DM in the frequency band, and design the parameters of the filter according to the differential mode inductance value L _DM to improve the effectiveness of the filter parameters and prevent the filter Failed due to impedance change.

As in the above step S3, the parameters of the filter are designed according to the common-mode capacitance value C _CM and the differential-mode inductance value L _DM , and the parameters of the filter are designed in combination with the common-mode capacitance value C _CM and the differential-mode inductance value L _DM to improve the The validity of the parameters of the filter to prevent the filter from failing due to impedance changes caused by nonlinear devices in the system during operation.

超标截止频率值f^*和共模电感值L_CM计算出共模电容值C_CM的步骤之前，还包括步骤：In this embodiment, the above-mentioned common-mode insertion loss value is

Before the step of calculating the common-mode capacitance value C _CM , the cut-off frequency value f ^* and the common-mode inductance value L _CM are exceeded, and the steps are also included:

计算出共模插入损耗值

式中，6[dBμV]为裕量。A1. According to the amplitude A _h of the exceeding frequency point and the limit value Limit of the selection standard, pass the formula:

Calculate the common mode insertion loss value

In the formula, 6[dBμV] is the margin.

计算出共模插入损耗值

式中，6[dBμV]为裕量，从而得到对应频率所需要的共模插入损耗值

进而得到对滤波器有效的共模电容值C_CM，防止滤波器因阻抗变化而失效。As in the above step A1, according to the amplitude A _h of the exceeding frequency point and the limit value Limit of the selection standard, the formula is passed:

Calculate the common mode insertion loss value

In the formula, 6[dBμV] is the margin, so as to obtain the common mode insertion loss value required by the corresponding frequency

Then, the effective common-mode capacitance value C _CM for the filter is obtained to prevent the filter from failing due to impedance changes.

超标截止频率值f^*和差模电容值C_DM计算出差模电感值L_DM的步骤之前，还包括步骤：In this embodiment, the above-mentioned value of insertion loss according to differential mode

Before the step of calculating the differential mode inductance value L _DM from the excess cut-off frequency value f ^* and the differential mode capacitance value C _DM , it also includes the following steps:

计算出差模插入损耗值

式中，6[dBμV]为裕量。A2. According to the amplitude A _h of the exceeding frequency point and the limit value Limit of the selection standard, the formula is passed:

Calculate the differential mode insertion loss value

In the formula, 6[dBμV] is the margin.

计算出差模插入损耗值

式中，6[dBμV]为裕量，从而得到对应频率所需要的共模插入损耗值

进而得到对滤波器有效的共模电感值L_DM，防止滤波器因阻抗变化而失效。As in the above step A2, according to the amplitude A _h of the exceeding frequency point and the limit value Limit of the selection standard, the formula is passed:

Calculate the differential mode insertion loss value

In the formula, 6[dBμV] is the margin, so as to obtain the common mode insertion loss value required by the corresponding frequency

Then, the effective common mode inductance value L _DM for the filter is obtained, so as to prevent the filter from failing due to impedance change.

上述超标截止频率值f^*和上述共模电感值L_CM计算出上述共模电容值C_CM的步骤之前，还包括步骤：Referring to FIG. 2, in this embodiment, the above-mentioned common mode insertion loss value according to the above

Before the step of calculating the above-mentioned common-mode capacitance value C _CM from the above-mentioned excessive cut-off frequency value f ^* and the above-mentioned common-mode inductance value L _CM , the following steps are further included:

和上述超标截止频率值f^*计算出上述共模电感值L_CM。S4. According to the equivalent impedance value Z _sCM of the common mode noise source, the above common mode insertion loss value

and the above-mentioned excess cut-off frequency value f ^* to calculate the above-mentioned common-mode inductance value L _CM .

和上述超标截止频率值f^*通过公式：

计算出上述共模电感值L_CM，考虑到共模噪声源的等效阻抗值Z_sCM和共模插入损耗值

对共模电感值L_CM的影响，并考虑到节约成本且不降低滤波器的参数的有效性的基础上将截止频率处的共模电感阻抗值设置为上述共模噪声源的等效阻抗值Z_sCM的3至5倍，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性。As in the above step S4, according to the equivalent impedance value Z _sCM of the common mode noise source and the above common mode insertion loss value

and the above exceedance cutoff frequency value f ^* by the formula:

Calculate the common mode inductance value L _CM above, taking into account the equivalent impedance value Z _sCM of the common mode noise source and the value of the common mode insertion loss

The effect on the common-mode inductance value L _CM , and considering the cost saving and not reducing the effectiveness of the parameters of the filter, the common-mode inductance impedance value at the cut-off frequency is set to the equivalent impedance value of the common-mode noise source above Z _sCM is 3 to 5 times, so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved.

和上述超标截止频率值f^*计算出上述共模电感值L_CM的步骤之前，还包括步骤：In this embodiment, the above-mentioned equivalent impedance value Z _sCM of the common-mode noise source, the above-mentioned common-mode insertion loss value

and the above-mentioned excess cut-off frequency value f ^* , before calculating the above-mentioned common-mode inductance value L _CM , it also includes the following steps:

计算出接入滤波器前后传输到负载的共模噪声低电压比值

S5. According to the above common mode insertion loss value

Calculate the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected

共模电感阻抗值Z_fCM和线性阻抗稳定网络对于共模滤波器传导模型的等效阻抗值R_loadCM计算出上述共模噪声源的等效电阻值Z_sCM。S6. According to the above-mentioned low-voltage ratio of common mode noise transmitted to the load before and after the filter is connected

The common mode inductor impedance value Z _fCM and the equivalent impedance value R _loadCM of the linear impedance stabilization network for the common mode filter conduction model calculate the equivalent resistance value Z _sCM of the above common mode noise source.

通过公式：

计算出接入滤波器前后传输到负载的共模噪声低电压比值

从而得到对应的频段中接入滤波器前后传输到负载的共模噪声低电压比值

进而对上述共模噪声源的等效电阻值Z_sCM做进一步计算，从而根据共模噪声源的等效电阻值设计滤波器的参数，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性。As in the above step S5, according to the above common mode insertion loss value

Via the formula:

Calculate the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected

Thereby, the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected in the corresponding frequency band is obtained.

Then, the equivalent resistance value Z _sCM of the above common-mode noise source is further calculated, so that the parameters of the filter are designed according to the equivalent resistance value of the common-mode noise source, so that the filter has a filtering effect in the corresponding frequency band, and improves the performance of the filter. The validity of the parameters of the filter.

共模电感阻抗值Z_fCM和线性阻抗稳定网络对于共模滤波器传导模型的等效阻抗值R_loadCM通过公式：

计算出上述共模噪声源的等效电阻值Z_sCM，从而得到对应的频段的上述共模噪声源的等效电阻值Z_sCM，从而根据共模噪声源的等效电阻值设计滤波器的参数，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性，其中，上述共模电感阻抗值Z_fCM的计算公式为：Z_fCM＝2πfL_CM，上述共模滤波器传导模型的结构如图4所示。As in the above step S6, according to the low voltage ratio of the common mode noise transmitted to the load before and after the filter is connected

The common mode inductor impedance value Z _fCM and the equivalent impedance value R _loadCM of the linear impedance stabilization network for the conduction model of the common mode filter are obtained by the formula:

Calculate the equivalent resistance value Z _sCM of the above common mode noise source, so as to obtain the equivalent resistance value Z _sCM of the above common mode noise source in the corresponding frequency band, so as to design the parameters of the filter according to the equivalent resistance value of the common mode noise source , so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved, wherein, the calculation formula of the above-mentioned common-mode inductance impedance value Z _fCM is: Z _fCM =2πfL _CM , the above-mentioned common-mode filter The structure of the conduction model is shown in Figure 4.

共模电感阻抗值Z_fCM和线性阻抗稳定网络对于共模滤波器传导模型的等效阻抗值R_loadCM计算出上述共模噪声源的等效电阻值Z_sCM的步骤之前，还包括步骤：In this embodiment, the low voltage ratio of the common mode noise transmitted to the load before and after the above-mentioned filter is connected

The common mode inductor impedance value Z _fCM and the equivalent impedance value R _loadCM of the linear impedance stabilization network for the conduction model of the common mode filter Before the step of calculating the equivalent resistance value Z _sCM of the above common mode noise source, it also includes the following steps:

和上述线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值R_loadCM建立上述共模滤波器传导模型及其目标函数：S7. According to the above-mentioned low-voltage ratio of common mode noise transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadCM of the above-mentioned common-mode filter conduction model to establish the above-mentioned common-mode filter conduction model and its objective function:

为接入滤波器前后传输到负载的共模噪声低电压比值，R_loadCM为线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值，Z_sCM为共模噪声源的等效电阻值，Z_fCM为共模电感阻抗值。In the formula,

is the low-voltage ratio of common mode noise transmitted to the load before and after the filter is connected, R _loadCM is the equivalent impedance value of the linear impedance stabilization network for the above-mentioned common mode filter conduction model, and Z _sCM is the equivalent resistance value of the common mode noise source , Z _fCM is the impedance value of the common mode inductor.

和上述线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值R_loadCM建立上述共模滤波器传导模型及其目标函数，从而得到接入滤波器前后传输到负载的共模噪声低电压比值

上述线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值R_loadCM、上述共模噪声源的等效电阻值Z_sCM与上述共模电感阻抗值Z_fCM之间的关系式，其中，上述共模滤波器传导模型的结构如图4所示；而传统的滤波器的参数设计中将共模噪声源的等效电阻值Z_sCM视为无穷大，并建立如图8所示的传统的共模滤波器传导模型及其目标函数：

式中，Z_L-CM为传统的共模电感阻抗值，Z_C-CM为共模电容值，A_TT-CM为接入滤波器前后传输到负载的传统共模噪声低电压比值，R_load为线性阻抗稳定网络对于传统的共模滤波器传导模型的等效阻抗值，进而可以算出共模电感值。As in the above step S7, according to the low voltage ratio of the common mode noise transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network to establish the above-mentioned common-mode filter conduction model and its objective function for the equivalent impedance value R _loadCM of the above-mentioned common-mode filter conduction model, so as to obtain the common-mode noise low voltage transmitted to the load before and after the filter is connected ratio

The relationship between the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadCM of the above-mentioned common-mode filter conduction model, the above-mentioned equivalent resistance value Z _sCM of the above-mentioned common-mode noise source, and the above-mentioned common-mode inductance impedance value Z _fCM , wherein, The structure of the above-mentioned common mode filter conduction model is shown in Figure 4; while in the parameter design of the traditional filter, the equivalent resistance value Z _sCM of the common mode noise source is regarded as infinite, and the traditional filter as shown in Figure 8 is established. Common mode filter conduction model and its objective function:

In the formula, Z _L-CM is the traditional common mode inductance impedance value, Z _C-CM is the common mode capacitance value, A _TT-CM is the traditional common mode noise low voltage ratio transmitted to the load before and after the filter is connected, R _load It is the equivalent impedance value of the linear impedance stabilization network for the traditional common mode filter conduction model, and then the common mode inductance value can be calculated.

上述超标截止频率值f^*和上述差模电容值C_DM计算出上述差模电感值L_DM的步骤之前，还包括步骤：Referring to FIG. 3, in this embodiment, the above-mentioned differential mode insertion loss value according to the above

Before the step of calculating the above-mentioned differential mode inductance value L _DM with the above-mentioned excessive cut-off frequency value f ^* and the above-mentioned differential-mode capacitance value C _DM , the following steps are further included:

和超标截止频率值f^*计算出差模电容值C_DM。S8. According to the equivalent impedance value Z _sDM of the differential mode noise source, the differential mode insertion loss value

and the excess cutoff frequency value f ^* to calculate the differential mode capacitance value C _DM .

和超标截止频率值f^*通过公式：

计算出差模电容值C_DM，考虑到差模噪声源的等效阻抗值Z_sDM和差模插入损耗值

对差模电容值C_DM的影响，并考虑到节约成本且不降低滤波器的参数的有效性的基础上将截止频率处的差模电容阻抗值设置为上述差模噪声源的等效阻抗值Z_sDM的0.2至0.5倍，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性。As in the above step S8, according to the equivalent impedance value Z _sDM of the differential mode noise source and the differential mode insertion loss value

and the excess cutoff frequency value f ^* by the formula:

Calculate the differential mode capacitance value C _DM , taking into account the equivalent impedance value Z _sDM of the differential mode noise source and the differential mode insertion loss value

The effect on the differential mode capacitor value C _DM , and considering the cost saving and the effectiveness of the filter parameters, the differential mode capacitor impedance value at the cutoff frequency is set to the equivalent impedance value of the above differential mode noise source. Z _sDM is 0.2 to 0.5 times, so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved.

和超标截止频率值f^*计算差模电容值C_DM的步骤之前，还包括步骤：In this embodiment, according to the above-mentioned equivalent impedance value Z _sDM of the differential mode noise source, differential mode insertion loss value

And before the step of calculating the differential mode capacitance value C _DM , the excess cutoff frequency value f ^* also includes the steps:

计算出接入滤波器前后传输到负载的差模噪声低电压比值

S9. According to the above differential mode insertion loss value

Calculate the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected

差模电容阻抗值Z_fDM和线性阻抗稳定网络对于差模滤波器传导模型的等效阻抗值R_loadDM计算出上述差模噪声源的等效电阻值Z_sDM。S10. According to the ratio of differential mode noise and low voltage transmitted to the load before and after the filter is connected

The differential mode capacitor impedance value Z _fDM and the equivalent impedance value R _loadDM of the differential mode filter conduction model of the linear impedance stabilization network are used to calculate the equivalent resistance value Z _sDM of the differential mode noise source.

通过公式：

计算出接入滤波器前后传输到负载的差模噪声低电压比值

从而得到对应的频段中接入滤波器前后传输到负载的差模噪声低电压比值

进而对上述差模噪声源的等效电阻值Z_sDM做进一步计算，从而根据差模噪声源的等效电阻值设计滤波器的参数，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性。As in the above step S9, according to the above differential mode insertion loss value

Via the formula:

Calculate the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected

Thereby, the low-voltage ratio of differential mode noise transmitted to the load before and after the filter is connected in the corresponding frequency band is obtained.

Then, the equivalent resistance value Z _sDM of the differential mode noise source is further calculated, and the parameters of the filter are designed according to the equivalent resistance value of the differential mode noise source, so that the filter has a filtering effect in the corresponding frequency band, and improves the performance of the filter. The validity of the parameters of the filter.

差模电容阻抗值Z_fDM和线性阻抗稳定网络对于差模滤波器传导模型的等效阻抗值R_loadDM通过公式：

计算出上述差模噪声源的等效电阻值Z_sDM，从而得到对应的频段的上述差模噪声源的等效电阻值Z_sDM，从而根据差模噪声源的等效电阻值设计滤波器的参数，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性，其中，上述差模电容阻抗值Z_fDM的计算公式为：

上述差模滤波器传导模型的结构如图5所示。As in the above step S10, according to the ratio of differential mode noise and low voltage transmitted to the load before and after the filter is connected

The differential mode capacitor impedance value Z _fDM and the equivalent impedance value R _loadDM of the linear impedance stabilization network for the differential mode filter conduction model are obtained by the formula:

Calculate the equivalent resistance value Z _sDM of the above differential mode noise source, so as to obtain the equivalent resistance value Z _sDM of the above differential mode noise source in the corresponding frequency band, so as to design the parameters of the filter according to the equivalent resistance value of the differential mode noise source , so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved, wherein the calculation formula of the above-mentioned differential mode capacitor impedance value Z _fDM is:

The structure of the above differential mode filter conduction model is shown in Figure 5.

差模电容阻抗值Z_fDM和线性阻抗稳定网络对于差模滤波器传导模型的等效阻抗值R_loadDM计算出上述差模噪声源的等效电阻值Z_sDM的步骤之前，还包括步骤：In this embodiment, the differential mode noise low voltage ratio transmitted to the load before and after the above-mentioned access filter

The differential mode capacitor impedance value Z _fDM and the linear impedance stabilization network are based on the equivalent impedance value R _loadDM of the differential mode filter conduction model. Before the step of calculating the equivalent resistance value Z _sDM of the differential mode noise source, the steps further include:

和上述线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值R_loadDM建立上述差模滤波器传导模型及其目标函数：S11. According to the ratio of differential mode noise and low voltage transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadDM of the above-mentioned differential-mode filter conduction model to establish the above-mentioned differential-mode filter conduction model and its objective function:

为接入滤波器前后传输到负载的差模噪声低电压比值，R_loadDM为线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值，Z_sDM为差模噪声源的等效电阻值，Z_fDM为差模电容阻抗值。In the formula,

is the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected, R _loadDM is the equivalent impedance value of the linear impedance stabilization network for the conduction model of the differential mode filter, Z _sDM is the equivalent resistance value of the differential mode noise source , Z _fDM is the impedance value of the differential mode capacitor.

和上述线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值R_loadDM建立上述差模滤波器传导模型及其目标函数，从而得到接入滤波器前后传输到负载的差模噪声低电压比值

上述线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值R_loadDM、上述差模噪声源的等效电阻值Z_sDM与上述差模电感阻抗值Z_fDM之间的关系式，其中，上述差模滤波器传导模型的结构如图5所示；而传统的滤波器的参数设计中将差模噪声源的等效电阻值Z_sDM视为无穷大，并建立如图9所示的传统的差模滤波器传导模型及其目标函数：

式中，Z_L-DM为传统的差模电感阻抗值，Z_C-DM为传统的差模电容阻抗值，A_TT-DM为接入滤波器前后传输到负载的传统差模噪声低电压比值，R_load为线性阻抗稳定网络对于传统的差模滤波器传导模型的等效阻抗值，进而可以算出差模电感值。As in the above step S11, according to the ratio of differential mode noise and low voltage transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network to establish the above-mentioned differential mode filter conduction model and its objective function for the equivalent impedance value R _loadDM of the above-mentioned differential mode filter conduction model, so as to obtain the differential mode noise low voltage transmitted to the load before and after the filter is connected ratio

The relationship between the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadDM of the above-mentioned differential mode filter conduction model, the above-mentioned equivalent resistance value Z _sDM of the differential mode noise source and the above-mentioned differential mode inductance impedance value Z _fDM , wherein, The structure of the conduction model of the above differential mode filter is shown in Figure 5; while in the parameter design of the traditional filter, the equivalent resistance value Z _sDM of the differential mode noise source is regarded as infinite, and the traditional filter as shown in Figure 9 is established. Differential mode filter conduction model and its objective function:

In the formula, Z _L-DM is the impedance value of the traditional differential mode inductor, Z _C-DM is the impedance value of the traditional differential mode capacitor, and A _TT-DM is the traditional differential mode noise low voltage ratio transmitted to the load before and after the filter is connected. , R _load is the equivalent impedance value of the linear impedance stabilization network for the traditional differential mode filter conduction model, and then the differential mode inductance value can be calculated.

1-3, in this embodiment, a method for calculating parameters of a filter includes the steps:

和上述线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值R_loadCM建立上述共模滤波器传导模型及其目标函数：S7. According to the above-mentioned low-voltage ratio of common mode noise transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadCM of the above-mentioned common-mode filter conduction model to establish the above-mentioned common-mode filter conduction model and its objective function:

和上述线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值R_loadDM建立上述差模滤波器传导模型及其目标函数：S11. According to the ratio of differential mode noise and low voltage transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadDM of the above-mentioned differential-mode filter conduction model to establish the above-mentioned differential-mode filter conduction model and its objective function:

计算出接入滤波器前后传输到负载的共模噪声低电压比值

S5. According to the above common mode insertion loss value

Calculate the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected

计算出接入滤波器前后传输到负载的差模噪声低电压比值

S9. According to the above differential mode insertion loss value

Calculate the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected

共模电感阻抗值Z_fCM和线性阻抗稳定网络对于共模滤波器传导模型的等效阻抗值R_loadCM计算出上述共模噪声源的等效电阻值Z_sCM。S6. According to the above-mentioned low-voltage ratio of common mode noise transmitted to the load before and after the filter is connected

The common mode inductor impedance value Z _fCM and the equivalent impedance value R _loadCM of the linear impedance stabilization network for the common mode filter conduction model calculate the equivalent resistance value Z _sCM of the above common mode noise source.

差模电容阻抗值Z_fDM和线性阻抗稳定网络对于差模滤波器传导模型的等效阻抗值R_loadDM计算出上述差模噪声源的等效电阻值Z_sDM。S10. According to the ratio of differential mode noise and low voltage transmitted to the load before and after the filter is connected

The differential mode capacitor impedance value Z _fDM and the equivalent impedance value R _loadDM of the differential mode filter conduction model of the linear impedance stabilization network are used to calculate the equivalent resistance value Z _sDM of the differential mode noise source.

和上述超标截止频率值f^*计算出上述共模电感值L_CM。S4. According to the equivalent impedance value Z _sCM of the common mode noise source, the above common mode insertion loss value

and the above-mentioned excess cut-off frequency value f ^* to calculate the above-mentioned common-mode inductance value L _CM .

和超标截止频率值f^*计算出差模电容值C_DM。S8. According to the equivalent impedance value Z _sDM of the differential mode noise source, the differential mode insertion loss value

and the excess cutoff frequency value f ^* to calculate the differential mode capacitance value C _DM .

超标截止频率值f^*和共模电感值L_CM计算出共模电容值C_CM；S1, according to the common mode insertion loss value

The common-mode capacitance value C _CM is calculated from the over-standard cut-off frequency value f ^* and the common-mode inductance value L _CM ;

超标截止频率值f^*和差模电容值C_DM计算出差模电感值L_DM；S2, according to the differential mode insertion loss value

The differential mode inductance value L _DM is calculated from the excess cut-off frequency value f ^* and the differential mode capacitance value C _DM ;

S3. Design the parameters of the filter according to the above-mentioned common-mode capacitance value C _CM and the above-mentioned differential-mode inductance value L _DM .

差模电容阻抗值Z_fDM和线性阻抗稳定网络对于差模滤波器传导模型的等效阻抗值R_loadDM计算出上述差模噪声源的等效电阻值Z_sDM的步骤之前，还包括步骤：In this embodiment, the differential mode noise low voltage ratio transmitted to the load before and after the above-mentioned access filter

The differential mode capacitor impedance value Z _fDM and the linear impedance stabilization network are based on the equivalent impedance value R _loadDM of the differential mode filter conduction model. Before the step of calculating the equivalent resistance value Z _sDM of the differential mode noise source, the steps further include:

6 , the present invention also proposes a system for calculating parameters of a filter, including:

超标截止频率值f^*和共模电感值L_CM通过公式：

计算出共模电容值C_CM，从而得到在该频段的有效的上述共模电容值C_CM，根据上述共模电容值C_CM设计滤波器的参数，提高滤波器的参数的有效性，防止滤波器因阻抗变化而失效；The common mode capacitance value calculation module 1 is used to calculate the common mode capacitance value C _CM according to the common mode insertion loss value IL _rCM , the over-standard cut-off frequency value f ^* and the common mode inductance value L _CM , and according to the common mode insertion loss value

Exceeded cutoff frequency value f ^* and common mode inductance value L _CM by formula:

Calculate the common-mode capacitance value C _CM , so as to obtain the effective common-mode capacitance value C _{CM in this frequency band, and design the parameters of the filter according to the above-mentioned common-mode capacitance value C CM to} improve the effectiveness of the parameters of the filter and prevent filtering The device fails due to impedance changes;

超标截止频率值f^*和差模电容值C_DM通过公式：

计算出差模电感值L_DM，从而得到在该频段的有效的上述差模电感值L_DM，根据上述差模电感值L_DM设计滤波器的参数，提高滤波器的参数的有效性，防止滤波器因阻抗变化而失效；The differential mode inductance value calculation module 2 is used to calculate the differential mode inductance value L _DM according to the differential mode insertion loss value IL _rDM , the over-standard cut-off frequency value f ^* and the differential mode capacitance value C _DM , and according to the differential mode insertion loss value

The excess cut-off frequency value f ^* and the differential mode capacitance value C _DM are obtained by the formula:

Calculate the differential mode inductance value L _DM , so as to obtain the effective differential mode inductance value L _DM in the frequency band, and design the parameters of the filter according to the differential mode inductance value L _DM to improve the effectiveness of the filter parameters and prevent the filter Failure due to impedance change;

The parameter design module 3 is used to design the parameters of the filter according to the above-mentioned common-mode capacitance value C _CM and the above-mentioned differential-mode inductance value L _DM , and design the parameters of the filter in combination with the above-mentioned common-mode capacitance value C _CM and the above-mentioned differential-mode inductance value L _DM , to improve the effectiveness of the parameters of the filter and prevent the filter from failing due to impedance changes caused by nonlinear devices in the system during operation.

In this embodiment, it also includes:

和上述超标截止频率值f^*计算出上述共模电感值L_CM，根据共模噪声源的等效阻抗值Z_sCM、上述共模插入损耗值

和上述超标截止频率值f^*通过公式：

计算出上述共模电感值L_CM，考虑到共模噪声源的等效阻抗值Z_sCM和共模插入损耗值

对共模电感值L_CM的影响，并考虑到节约成本且不降低滤波器的参数的有效性的基础上将截止频率处的共模电感阻抗值设置为上述共模噪声源的等效阻抗值Z_sCM的3至5倍，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性；The common mode inductance value calculation module is used for the equivalent impedance value Z _sCM of the common mode noise source and the above common mode insertion loss value

and the above-mentioned over-standard cut-off frequency value f ^* to calculate the above-mentioned common-mode inductance value L _CM , according to the equivalent impedance value Z _sCM of the common-mode noise source and the above-mentioned common-mode insertion loss value

and the above exceedance cutoff frequency value f ^* by the formula:

Calculate the common mode inductance value L _CM above, taking into account the equivalent impedance value Z _sCM of the common mode noise source and the value of the common mode insertion loss

The effect on the common-mode inductance value L _CM , and considering the cost saving and not reducing the effectiveness of the parameters of the filter, the common-mode inductance impedance value at the cut-off frequency is set to the equivalent impedance value of the common-mode noise source above Z _sCM is 3 to 5 times, so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved;

计算出接入滤波器前后传输到负载的共模噪声低电压比值

根据上述共模插入损耗值

通过公式：

计算出接入滤波器前后传输到负载的共模噪声低电压比值

从而得到对应的频段中接入滤波器前后传输到负载的共模噪声低电压比值

进而对上述共模噪声源的等效电阻值Z_sCM做进一步计算，从而根据共模噪声源的等效电阻值设计滤波器的参数，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性；Common Mode Noise Low Voltage Ratio Calculation Module for common mode insertion loss values based on the above

Calculate the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected

According to the above common mode insertion loss value

Via the formula:

Calculate the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected

Thereby, the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected in the corresponding frequency band is obtained.

Then, the equivalent resistance value Z _sCM of the above common-mode noise source is further calculated, so that the parameters of the filter are designed according to the equivalent resistance value of the common-mode noise source, so that the filter has a filtering effect in the corresponding frequency band, and improves the performance of the filter. the validity of the parameters of the filter;

共模电感阻抗值Z_fCM和线性阻抗稳定网络对于共模滤波器传导模型的等效阻抗值R_loadCM计算出上述共模噪声源的等效电阻值Z_sCM，根据上述接入滤波器前后传输到负载的共模噪声低电压比值

共模电感阻抗值Z_fCM和线性阻抗稳定网络对于共模滤波器传导模型的等效阻抗值R_loadCM通过公式：

计算出上述共模噪声源的等效电阻值Z_sCM，从而得到对应的频段的上述共模噪声源的等效电阻值Z_sCM，从而根据共模噪声源的等效电阻值设计滤波器的参数，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性，其中，上述共模电感阻抗值Z_fCM的计算公式为：Z_fCM＝2πfL_CM；The equivalent resistance value calculation module of the common mode noise source is used to calculate the low voltage ratio of the common mode noise transmitted to the load before and after the filter is connected to the above

The impedance value Z _fCM of the common mode inductor and the equivalent impedance value R _loadCM of the linear impedance stabilization network for the conduction model of the common mode filter are used to calculate the equivalent resistance value Z _sCM of the above common mode noise source. Load Common Mode Noise Low Voltage Ratio

The common mode inductor impedance value Z _fCM and the equivalent impedance value R _loadCM of the linear impedance stabilization network for the conduction model of the common mode filter are obtained by the formula:

Calculate the equivalent resistance value Z _sCM of the above common mode noise source, so as to obtain the equivalent resistance value Z _sCM of the above common mode noise source in the corresponding frequency band, so as to design the parameters of the filter according to the equivalent resistance value of the common mode noise source , so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved, wherein, the calculation formula of the above-mentioned common mode inductance impedance value Z _fCM is: Z _fCM =2πfL _CM ;

和上述线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值R_loadCM建立上述共模滤波器传导模型及其目标函数：

式中，

为接入滤波器前后传输到负载的共模噪声低电压比值，R_loadCM为线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值，Z_sCM为共模噪声源的等效电阻值，Z_fCM为共模电感阻抗值，根据上述接入滤波器前后传输到负载的共模噪声低电压比值

和上述线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值R_loadCM建立上述共模滤波器传导模型及其目标函数，从而得到接入滤波器前后传输到负载的共模噪声低电压比值

上述线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值R_loadCM、上述共模噪声源的等效电阻值Z_sCM与上述共模电感阻抗值Z_fCM之间的关系式；The common-mode filter conduction model building module is used for the low-voltage ratio of common-mode noise transmitted to the load before and after the filter is connected.

and the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadCM of the above-mentioned common-mode filter conduction model to establish the above-mentioned common-mode filter conduction model and its objective function:

In the formula,

is the low-voltage ratio of common mode noise transmitted to the load before and after the filter is connected, R _loadCM is the equivalent impedance value of the linear impedance stabilization network for the above-mentioned common mode filter conduction model, and Z _sCM is the equivalent resistance value of the common mode noise source , Z _fCM is the impedance value of the common mode inductor, according to the low voltage ratio of the common mode noise transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network to establish the above-mentioned common-mode filter conduction model and its objective function for the equivalent impedance value R _loadCM of the above-mentioned common-mode filter conduction model, so as to obtain the common-mode noise low voltage transmitted to the load before and after the filter is connected ratio

The relationship between the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadCM of the above-mentioned common-mode filter conduction model, the above-mentioned equivalent resistance value Z _sCM of the common-mode noise source, and the above-mentioned common-mode inductance impedance value Z _fCM ;

和超标截止频率值f^*计算出差模电容值C_DM，根据差模噪声源的等效阻抗值Z_sDM、差模插入损耗值

和超标截止频率值f^*通过公式：

计算出差模电容值C_DM，考虑到差模噪声源的等效阻抗值Z_sDM和差模插入损耗值

对差模电容值C_DM的影响，并考虑到节约成本且不降低滤波器的参数的有效性的基础上将截止频率处的差模电容阻抗值设置为上述差模噪声源的等效阻抗值Z_sDM的0.2至0.5倍，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性；The differential mode capacitance value calculation module is used to calculate the equivalent impedance value Z _sDM of the differential mode noise source and the differential mode insertion loss value

and the over-standard cut-off frequency value f ^* to calculate the differential mode capacitance value C _DM , according to the equivalent impedance value Z _sDM of the differential mode noise source, the differential mode insertion loss value

and the excess cutoff frequency value f ^* by the formula:

Calculate the differential mode capacitance value C _DM , taking into account the equivalent impedance value Z _sDM of the differential mode noise source and the differential mode insertion loss value

The effect on the differential mode capacitor value C _DM , and considering the cost saving and the effectiveness of the filter parameters, the differential mode capacitor impedance value at the cutoff frequency is set to the equivalent impedance value of the above differential mode noise source. Z _sDM is 0.2 to 0.5 times, so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved;

计算出接入滤波器前后传输到负载的差模噪声低电压比值

根据上述差模插入损耗值

通过公式：

计算出接入滤波器前后传输到负载的差模噪声低电压比值

从而得到对应的频段中接入滤波器前后传输到负载的差模噪声低电压比值

进而对上述差模噪声源的等效电阻值Z_sDM做进一步计算，从而根据差模噪声源的等效电阻值设计滤波器的参数，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性；Differential mode noise low voltage ratio calculation module, used to calculate the differential mode insertion loss value according to the above

Calculate the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected

According to the above differential mode insertion loss value

Via the formula:

Calculate the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected

Thereby, the low-voltage ratio of differential mode noise transmitted to the load before and after the filter is connected in the corresponding frequency band is obtained.

Then, the equivalent resistance value Z _sDM of the differential mode noise source is further calculated, and the parameters of the filter are designed according to the equivalent resistance value of the differential mode noise source, so that the filter has a filtering effect in the corresponding frequency band, and improves the performance of the filter. the validity of the parameters of the filter;

差模电容阻抗值Z_fDM和线性阻抗稳定网络对于差模滤波器传导模型的等效阻抗值R_loadDM计算出上述差模噪声源的等效电阻值Z_sDM，根据上述接入滤波器前后传输到负载的差模噪声低电压比值

差模电容阻抗值Z_fDM和线性阻抗稳定网络对于差模滤波器传导模型的等效阻抗值R_loadDM通过公式：

计算出上述差模噪声源的等效电阻值Z_sDM，从而得到对应的频段的上述差模噪声源的等效电阻值Z_sDM，从而根据差模噪声源的等效电阻值设计滤波器的参数，从而使滤波器在对应的频段上具有滤波效果，且提高滤波器的参数的有效性，其中，上述差模电容阻抗值Z_fDM的计算公式为：

The equivalent resistance value calculation module of the differential mode noise source is used to calculate the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected.

The differential mode capacitor impedance value Z _fDM and the linear impedance stabilization network calculate the equivalent resistance value Z _sDM of the differential mode noise source for the equivalent impedance value R _loadDM of the differential mode filter conduction model. Load differential mode noise low voltage ratio

The differential mode capacitor impedance value Z _fDM and the equivalent impedance value R _loadDM of the linear impedance stabilization network for the differential mode filter conduction model are obtained by the formula:

Calculate the equivalent resistance value Z _sDM of the above differential mode noise source, so as to obtain the equivalent resistance value Z _sDM of the above differential mode noise source in the corresponding frequency band, so as to design the parameters of the filter according to the equivalent resistance value of the differential mode noise source , so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved, wherein the calculation formula of the above-mentioned differential mode capacitor impedance value Z _fDM is:

和上述线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值R_loadDM建立上述差模滤波器传导模型及其目标函数：

式中，

为接入滤波器前后传输到负载的差模噪声低电压比值，R_loadDM为线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值，Z_sDM为差模噪声源的等效电阻值，Z_fDM为差模电容阻抗值，根据上述接入滤波器前后传输到负载的差模噪声低电压比值

和上述线性阻抗稳定网络对于上述差模滤波器传导模型的等效阻抗值R_loadDM建立上述差模滤波器传导模型及其目标函数，从而得到接入滤波器前后传输到负载的共模噪声低电压比值

上述线性阻抗稳定网络对于上述共模滤波器传导模型的等效阻抗值R_loadCM、上述共模噪声源的等效电阻值Z_sCM与上述共模电感阻抗值Z_fCM之间的关系式。The differential mode filter conduction model building module is used for the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected to the load

and the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadDM of the above-mentioned differential-mode filter conduction model to establish the above-mentioned differential-mode filter conduction model and its objective function:

In the formula,

is the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected, R _loadDM is the equivalent impedance value of the linear impedance stabilization network for the conduction model of the differential mode filter, Z _sDM is the equivalent resistance value of the differential mode noise source , Z _fDM is the impedance value of the differential mode capacitor, according to the ratio of differential mode noise and low voltage transmitted to the load before and after the filter is connected

and the above-mentioned linear impedance stabilization network for the equivalent impedance value R _loadDM of the above-mentioned differential-mode filter conduction model to establish the above-mentioned differential-mode filter conduction model and its objective function, so as to obtain the low-voltage common mode noise transmitted to the load before and after the filter is connected ratio

The relationship between the equivalent impedance value R _loadCM of the conduction model of the common mode filter, the equivalent resistance value Z _sCM of the common mode noise source, and the impedance value Z _fCM of the common mode inductance of the linear impedance stabilization network.

7 , in an embodiment of the present invention, the present invention further provides a computer device, the above-mentioned computer device 4 is expressed in the form of a general-purpose computing device, and the components of the computer device 4 may include but are not limited to: one or more processors or Processing unit 5, system memory 11, bus 7 connecting different system components (including system memory 11 and processing unit 6).

Bus 7 represents one or more of several types of bus structures, including a memory bus or memory controller, a peripheral bus, a graphics acceleration port, a processor, or a local bus using any of a variety of bus structures. By way of example, these architectures include, but are not limited to, Industry Standard Architecture (ISA) bus, Micro Channel Architecture (MAC) bus, Enhanced ISA bus, Video Electronics Standards Association (VESA) local bus, and Peripheral Component Interconnect ( PCI) bus.

Computer device 4 typically includes a variety of computer system readable media. These media can be any available media that can be accessed by the computer device 4, including volatile and non-volatile media, removable and non-removable media.

System memory 11 may include computer system readable media in the form of volatile memory, such as random access memory (RAM) 12 and/or cache memory 13 . Computer device 4 may further include other removable/non-removable, volatile/non-volatile computer system storage media. For example only, storage system 14 may be used to read and write to non-removable, non-volatile magnetic media (commonly referred to as "hard drives"). Although not shown in FIG. 7, a magnetic disk drive for reading and writing to removable non-volatile magnetic disks (eg "floppy disks") and removable non-volatile optical disks (eg CD-ROM, DVD-ROM) may be provided or other optical media) to read and write optical drives. In these cases, each drive may be connected to bus 7 via one or more data medium interfaces. The memory may include at least one program product having a set (eg, at least one) of program modules 16 configured to perform the functions of various embodiments of the present invention.

A program/utility 15 having a set (at least one) of program modules 16, which may be stored, for example, in a memory, such program modules 16 including, but not limited to, an operating system, one or more application programs, other program modules As well as program data, each or some combination of these examples may include an implementation of a network environment. Program modules 16 generally perform the functions and/or methods of the described embodiments of the present invention.

The computer device 4 may also communicate with one or more external devices 5 (eg keyboard, pointing device, display 10, camera, etc.), and also with one or more devices that enable a user to interact with the computer device 4, and/or Or with any device (eg, network card, modem, etc.) that enables the computer device 4 to communicate with one or more other computing devices. Such communication may take place through an input/output (I/O) interface 9 . Also, the computer device 4 may communicate with one or more networks (eg, a local area network (LAN)), a wide area network (WAN), and/or a public network (eg, the Internet) through a network adapter 8 . As shown, the network adapter 8 communicates with other modules of the computer device 4 via the bus 7 . It should be understood that, although not shown in FIG. 7, other hardware and/or software modules may be used in conjunction with computer device 4, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tapes drives and data backup storage systems, etc.

The processing unit 6 executes various functional applications and data processing by running the programs stored in the system memory 11 , for example, implements the method for calculating parameters of the filter provided by the embodiments of the present invention.

超标截止频率值f^*和共模电感值L_CM计算出共模电容值C_CM，并根据差模插入损耗值

超标截止频率值f^*和差模电容值C_DM计算出差模电感值L_DM，再根据上述共模电容值C_CM和上述差模电感值L_DM设计滤波器的参数。That is, when the above-mentioned processing unit 6 executes the above-mentioned program, it realizes: according to the common-mode insertion loss value

The excess cutoff frequency value f ^* and the common mode inductance value L _CM calculate the common mode capacitance value C _CM , and according to the differential mode insertion loss value

The over-standard cut-off frequency value f ^* and the differential mode capacitance value C _DM are used to calculate the differential mode inductance value L _DM , and then the parameters of the filter are designed according to the above common mode capacitance value C _CM and the above differential mode inductance value L _DM .

In an embodiment of the present invention, the present invention also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the method for calculating the parameters of the filter provided by all the embodiments of the present application is implemented:

超标截止频率值f^*和共模电感值L_CM计算出共模电容值C_CM，并根据差模插入损耗值

超标截止频率值f^*和差模电容值C_DM计算出差模电感值L_DM，再根据上述共模电容值C_CM和上述差模电感值L_DM设计滤波器的参数。That is, when the program is executed by the processor: according to the common mode insertion loss value

The excess cutoff frequency value f ^* and the common mode inductance value L _CM calculate the common mode capacitance value C _CM , and according to the differential mode insertion loss value

The over-standard cut-off frequency value f ^* and the differential mode capacitance value C _DM are used to calculate the differential mode inductance value L _DM , and then the parameters of the filter are designed according to the above common mode capacitance value C _CM and the above differential mode inductance value L _DM .

Any combination of one or more computer-readable media may be employed. The computer-readable medium may be a computer-readable signal medium or a computer-readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared or semiconductor system, apparatus or device, or a combination of any of the above. More specific examples (non-exhaustive list) of computer readable storage media include: electrical connections with one or more wires, portable computer disks, hard disks, random access memory (RAM) 12, read only memory (ROM) , Erasable Programmable Read Only Memory (EPOM or flash memory), optical fiber, portable compact disk read only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above. In this document, a computer-readable storage medium can be any tangible medium that contains or stores a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

A computer-readable signal medium may include a propagated data signal in baseband or as part of a carrier wave with computer-readable program code embodied thereon. Such propagated data signals may take a variety of forms including, but not limited to, electromagnetic signals, optical signals, or any suitable combination of the foregoing. A computer-readable signal medium can also be any computer-readable medium other than a computer-readable storage medium, which can transmit, propagate, or transmit a program for use by or in conjunction with the instruction execution system, apparatus, or device. .

Computer program code for carrying out operations of the present invention may be written in one or more programming languages, including object-oriented programming languages such as Java, Smalltalk, C++, and conventional Procedural programming language - such as the "C" language or similar programming language. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (eg, using an Internet service provider to via Internet connection).

In the method, system, equipment and storage medium for calculating parameters of a filter of the present invention, the common-mode capacitance value and the differential-mode inductance value are obtained by calculating respectively, so that the parameters of the filter are designed according to the common-mode capacitance value and the differential-mode inductance value, thereby improving the The validity of the parameters of the filter prevents the filter from failing due to impedance changes caused by nonlinear devices in the system during operation; and by calculating the value of the common mode inductance and the value of the differential mode capacitor, considering the equivalent of the common mode noise source The influence of impedance value and common mode insertion loss value on the common mode inductance value, and considering the influence of the equivalent impedance value of the differential mode noise source and the differential mode insertion loss value on the differential mode capacitance value, so that the filter can operate in the corresponding frequency band. It has a filtering effect on the filter, and improves the effectiveness of the parameters of the filter; and, by calculating the equivalent resistance value of the common mode noise source and the equivalent resistance value of the differential mode noise source, according to the equivalent resistance value of the common mode noise source The parameters of the filter are designed according to the resistance value and the equivalent resistance value of the differential mode noise source, so that the filter has a filtering effect in the corresponding frequency band, and the effectiveness of the parameters of the filter is improved.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related All technical fields are similarly included in the scope of patent protection of the present invention.

Claims (8)

1. a calculation method of the parameter of a filter, is characterized in that, comprises the steps: According to the equivalent impedance value Z _sCM of the common mode noise source, the value of the common mode insertion loss

and the excess cutoff frequency value f ^* , by the formula:

Calculate the common mode inductance value L _CM ; According to the common mode insertion loss value

The over-standard cut-off frequency value f ^* and the common-mode inductance value L _CM are obtained by the formula:

Calculate the common mode capacitance value C _CM ; According to the equivalent impedance value Z _sDM of the differential mode noise source, the differential mode insertion loss value

and the excess cutoff frequency value f ^* , by the formula:

Calculate the differential mode capacitance value C _DM ; According to the differential mode insertion loss value

The over-standard cut-off frequency value f ^* and the differential mode capacitance value C _DM are obtained by the formula:

Calculate the differential mode inductance value L _DM ; The parameters of the filter are designed according to the common mode capacitance value C _CM and the differential mode inductance value L _DM . 2. The method for calculating the parameters of the filter according to claim 1, characterized in that, in the equivalent impedance value Z _sCM according to the common mode noise source, the common mode insertion loss value

And before the step of calculating the common-mode inductance value L _CM with the over-standard cut-off frequency value f ^* , it also includes the steps of: According to the common mode insertion loss value

Calculate the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected

According to the low voltage ratio of common mode noise transmitted to the load before and after the access filter

The common mode inductance impedance value Z _fCM and the linear impedance stabilization network calculate the equivalent resistance value Z _sCM of the common mode noise source for the equivalent impedance value R _loadCM of the common mode filter conduction model. 3. The method for calculating the parameters of the filter according to claim 2, wherein the common mode noise low voltage ratio transmitted to the load before and after the filter is connected to the load

Before the step of calculating the equivalent resistance value Z _sCM of the common mode noise source for the equivalent impedance value R _loadCM of the conduction model of the common mode filter by the impedance value Z _fCM of the common mode inductance and the linear impedance stabilization network, the steps further include: According to the low voltage ratio of common mode noise transmitted to the load before and after the access filter

and the equivalent impedance value _RloadCM of the linear impedance stabilization network for the common-mode filter conduction model to establish the common-mode filter conduction model and its objective function:

In the formula,

is the low voltage ratio of common mode noise transmitted to the load before and after the filter is connected, R _loadCM is the equivalent impedance value of the linear impedance stabilization network for the conduction model of the common mode filter, Z _sCM is the equivalent resistance of the common mode noise source value, Z _fCM is the impedance value of the common mode inductor. 4. The method for calculating the parameters of the filter according to claim 1, characterized in that, in the said equivalent impedance value Z _sDM according to the differential mode noise source, differential mode insertion loss value

And before the step of calculating the differential mode capacitance value C _DM , the excess cutoff frequency value f ^* also includes the steps: According to the differential mode insertion loss value

Calculate the low voltage ratio of differential mode noise transmitted to the load before and after the filter is connected

According to the low voltage ratio of differential mode noise transmitted to the load before and after the access filter

The differential mode capacitor impedance value Z _fDM and the equivalent impedance value R _loadDM of the differential mode filter conduction model of the linear impedance stabilization network calculate the equivalent resistance value Z _sDM of the differential mode noise source. 5. The method for calculating the parameters of the filter according to claim 4, characterized in that, before and after the filter is connected to the filter, the differential mode noise low voltage ratio transmitted to the load

Before the step of calculating the equivalent resistance value Z _sDM of the differential mode noise source from the differential mode capacitor impedance value Z _fDM and the linear impedance stabilization network for the equivalent impedance value R _loadDM of the differential mode filter conduction model, the step further includes: According to the low-voltage ratio of differential mode noise transmitted to the load before and after the access filter

and the equivalent impedance value R _loadDM of the linear impedance stabilization network for the differential mode filter conduction model to establish the differential mode filter conduction model and its objective function:

In the formula,

is the differential mode noise low voltage ratio transmitted to the load before and after the filter is connected, R _loadDM is the equivalent impedance value of the linear impedance stabilization network for the differential mode filter conduction model, Z _sDM is the equivalent resistance of the differential mode noise source value, Z _fDM is the differential mode capacitor impedance value. 6. A computing system for parameters of a filter, characterized in that, comprising: A common-mode capacitance value calculation module, used for the equivalent impedance value Z _sCM of the common-mode noise source, the common-mode insertion loss value

and the excess cutoff frequency value f ^* , by the formula:

Calculate the common mode inductance value L _CM ; A common-mode capacitance value calculation module for the common-mode insertion loss value

The over-standard cut-off frequency value f ^* and the common-mode inductance value L _CM are obtained by the formula:

Calculate the common mode capacitance value C _CM ; A differential mode capacitance value calculation module, configured to calculate the differential mode noise source based on the equivalent impedance value Z _sDM of the differential mode noise source and the differential mode insertion loss value

and the excess cutoff frequency value f ^* , by the formula:

Calculate the differential mode capacitance value C _DM ; A differential mode inductance value calculation module for inserting the loss value according to the differential mode

The over-standard cut-off frequency value f ^* and the differential mode capacitance value C _DM are obtained by the formula:

Calculate the differential mode inductance value L _DM ; A parameter design module, configured to design parameters of the filter according to the common mode capacitance value C _CM and the differential mode inductance value L _DM . 7. A computer device, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements any one of claims 1 to 5 when the processor executes the program one of the methods described. 8 . A computer-readable storage medium on which a computer program is stored, characterized in that, when the program is executed by a processor, the method according to any one of claims 1 to 5 is implemented.

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