CN115015674A - Method for determining filter device, storage medium, and filter device - Google Patents

Abstract

The embodiment of the application provides a method for determining a filter device, a storage medium and the filter device, and the method comprises the steps of obtaining a first test result, wherein the first test result is obtained by conducting EMI disturbance test on a first domain controller based on a current method, determining a first exceeding frequency point range of the first domain controller according to the first test result, determining a rated current of a common mode inductor according to an actual input current of the first domain controller, determining a first alternating current resistance of the common mode inductor according to a exceeding value corresponding to the first exceeding frequency point range and the first exceeding frequency point range, determining a target size of the common mode inductor according to a space size of the first domain controller, and determining the common mode inductor as the first filter device of the first domain controller so as to conduct EMI filtering on the first domain controller through the first filter device. The embodiment can realize quick, effective and low-cost conduction EMI disturbance test through the domain controller.

Description

Determination method of filter device, storage medium and filter device

technical field

The embodiments of the present application relate to the technical field of automotive electronics, and in particular, to a method for determining a filtering device, a storage medium, and a filtering device.

Background technique

With the promotion of the automotive electronic intelligent driving domain controller, the functions carried by the domain controller are becoming more and more powerful, and the power consumption is gradually increased. The switching power supply in the domain controller is highly efficient and popular in the automotive electronic intelligent driving domain control widely used in the device. With the gradual increase in the frequency of switching power supplies and the increase in the number of switching power supplies, switching noise has become the main noise source of conducted electromagnetic interference (EMI). The current method test is a more important test in the conducted EMI disturbance test of the domain controller of automotive electronic intelligent driving. How to solve the problem of excessive frequency of conducted EMI disturbance in the current method test is an important topic at present.

In the related art, different methods such as grounding method, shielding method, filtering method, etc., or a combination of various methods can be used to solve the problem that the conducted EMI disturbance test of the domain controller cannot be passed.

However, in the process of realizing the present application, the inventor found that there are at least the following problems in the prior art: the grounding method of changing the housing structure or adjusting the layout of the printed board is too large, and the completion period is long and the efficiency is low. The volume of the filter is too large, because the domain controller has a fixed volume, many functions and multiple devices, high device density and wiring density, and the remaining free space in the housing is limited, which makes it impossible to place the above filtering device in the domain controller, and the cost is high. How to quickly, effectively and cost-effectively pass the domain controller conducted EMI disturbance test is an urgent problem to be solved.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a method for determining a filtering device, a storage medium, and a filtering device, so as to conduct EMI disturbance testing through a domain controller in a fast, effective and low-cost manner.

In a first aspect, an embodiment of the present application provides a method for determining a filtering device, including:

obtaining a first test result; the first test result is obtained by conducting a conducted EMI disturbance test on the first domain controller based on the current method;

According to the first test result, determine the first over-standard frequency range of the first domain controller;

Determine the rated current of the common mode inductor according to the actual input current of the first domain controller;

determining the first alternating current resistance of the common mode inductor according to the over-standard value corresponding to the first over-standard frequency point range and the first over-standard frequency point range;

determining the target size of the common mode inductor according to the space size of the first domain controller;

The common mode inductance is determined as a first filtering device of the first domain controller, so as to perform conducted EMI filtering on the first domain controller through the first filtering device.

In a possible design, the method further includes:

Obtain a second test result; the second test result is obtained by conducting a conducted EMI disturbance test on the second domain controller based on the current method; the second domain controller is obtained by combining the first filtering device with the obtained after connecting the input end of the switching power supply of the first domain controller;

According to the second test result, determine the second over-standard frequency range of the second domain controller;

Adjusting the first filtering device according to the second over-standard frequency range to obtain a second filtering device of the first domain controller, so as to use the second filtering device to filter the first domain controller Conduct conducted EMI filtering.

In a possible design, the first filtering device is adjusted according to the second over-standard frequency range to obtain the second filtering device of the first domain controller, including:

determining the second AC resistance of the common mode inductor according to the over-standard value within the range of the second over-standard frequency point;

selecting a new common mode inductance according to the second alternating current resistance;

If the size of the new common mode inductor is smaller than the space size, the new common mode inductor is determined as the second filtering device of the first domain controller.

In a possible design, the determining of the second AC resistance of the common mode inductor according to the over-standard value within the range of the second over-standard frequency point includes:

If the rated current of the common mode inductance is less than the preset threshold, the second AC resistance of the common mode inductance is determined according to the out-of-standard value in the range of the second out-of-standard frequency point.

In a possible design, the first filtering device is adjusted according to the second over-standard frequency range to obtain the second filtering device of the first domain controller, including:

Determine the rated current of the inductor magnetic beads according to the rated current of the common mode inductor;

determining the third alternating current resistance of the inductive magnetic beads according to the over-standard value within the second over-standard frequency point range and the second over-standard frequency point range;

The inductive magnetic beads are connected in series at the rear end of the common mode inductance to obtain the second filtering device of the first domain controller.

In a possible design, the method further includes:

Obtain a third test result; the third test result is obtained by conducting a conducted EMI disturbance test on the third domain controller based on the current method; the third domain controller is obtained by combining the second filtering device with the obtained after connecting the input end of the switching power supply of the first domain controller;

According to the third test result, it is determined whether the third domain controller has an over-standard frequency point.

In the case that the third domain controller does not have an over-standard frequency point, the second filtering device is determined as the final filtering device.

In a possible design, the method further includes:

In the case that the third domain controller has an over-standard frequency point, according to the over-standard value of the over-standard frequency point of the third domain controller and the over-standard frequency point of the third domain controller, the second The filtering means is adjusted to obtain a third filtering means for conducting conducted EMI filtering on the first domain controller through the third filtering means.

In a second aspect, an embodiment of the present application provides a device for determining a filtering device, including:

an acquisition module for acquiring a first test result; the first test result is obtained by conducting a conducted EMI disturbance test on the first domain controller based on the current method;

a processing module, configured to determine the first over-standard frequency range of the first domain controller according to the first test result;

Determine the rated current of the common mode inductor according to the actual input current of the first domain controller;

determining the first alternating current resistance of the common mode inductor according to the over-standard value corresponding to the first over-standard frequency point range and the first over-standard frequency point range;

determining the target size of the common mode inductor according to the space size of the first domain controller;

The common mode inductance is determined as a first filtering device of the first domain controller, so as to perform conducted EMI filtering on the first domain controller through the first filtering device.

In a third aspect, an embodiment of the present application provides a filtering device, including:

a common mode inductor, connected to the input end of the switching power supply of the first domain controller, and used for conducting conducted EMI filtering on the first domain controller;

Wherein, the target size of the common mode inductor is determined according to the space size of the first domain controller; the rated current of the common mode inductor is determined according to the actual input current of the first domain controller; the The first AC resistance of the common mode inductor is determined according to the over-standard value corresponding to the first over-standard frequency point range and the first over-standard frequency point range; the first over-standard frequency point range of the first domain controller is Determined according to the first test result; the first test result is obtained by conducting a conducted EMI disturbance test on the first domain controller based on the current method.

In a fourth aspect, an embodiment of the present application provides a device for determining a filtering device, including: at least one processor and a memory;

the memory stores computer-executable instructions;

The at least one processor executes computer-implemented instructions stored in the memory to cause the at least one processor to perform the methods described in the first aspect and various possible designs of the first aspect above.

In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, where computer-executable instructions are stored in the computer-readable storage medium, and when a processor executes the computer-executable instructions, the first aspect and the first Aspects various possible designs of the described method.

In a sixth aspect, embodiments of the present application provide a computer program product, including a computer program, which, when executed by a processor, implements the method described in the first aspect and various possible designs of the first aspect.

The method for determining a filtering device, the storage medium, and the filtering device provided in this embodiment include obtaining a first test result, and the first test result is obtained by conducting a conducted EMI disturbance test on a first domain controller based on the current method. A test result: determine the first over-standard frequency range of the first domain controller, determine the rated current of the common mode inductor according to the actual input current of the first domain controller, and determine the over-standard value corresponding to the first over-standard frequency range and the first Exceed the standard frequency range, determine the first AC resistance of the common mode inductor, determine the target size of the common mode inductor according to the space size of the first domain controller, and determine the common mode inductor as the first filtering device of the first domain controller , so as to conduct conducted EMI filtering on the first domain controller through the first filtering means. In the method for determining the filter device provided in this embodiment, a common mode inductance is selected as the filter element based on the test results of the EMI disturbance conducted by the AC method, and the parameter value of the common mode inductance is further determined based on the test results, which can realize fast, effective and low-cost filtering. Pass domain controller conducted EMI disturbance test.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort.

1 is a schematic flowchart 1 of a method for determining a filtering device provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of a second domain controller according to an embodiment of the present application;

3 is a schematic diagram of a first test result provided by an embodiment of the present application;

4 is a second schematic flowchart of a method for determining a filtering device according to an embodiment of the present application;

FIG. 5 is a schematic structural diagram of a third domain controller according to an embodiment of the present application;

6 is a schematic diagram of a second test result provided by an embodiment of the present application;

7 is a schematic diagram of a third test result provided by an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a determination device of a filtering apparatus provided by an embodiment of the present application;

FIG. 9 is a structural block diagram of a device for determining a filtering apparatus provided in an embodiment of the present application.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments It is a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

With the promotion of the automotive electronic intelligent driving domain controller, the functions carried by the domain controller are becoming more and more powerful, and the power consumption is gradually increased. The switching power supply in the domain controller is highly efficient and popular in the automotive electronic intelligent driving domain control widely used in the device. With the gradual increase in the frequency of switching power supplies and the increase in the number of switching power supplies, switching noise has become the main noise source of conducted electromagnetic interference (EMI). In the conducted EMI harassment test of the domain controller of automotive electronic intelligent driving, there are voltage method and current method. Due to the large number of tested wiring harnesses in the current method test and the low multi-level limit, it is more difficult to overcome than the voltage method. Passing the current method test is an important prerequisite for completing the conducted EMI disturbance test of the automotive electronic intelligent driving domain controller.

In the related art, different methods such as grounding method, shielding method, filtering method, etc., or a combination of various methods can be used to solve the problem that the conducted EMI disturbance test of the domain controller cannot be passed. Taking the grounding method as an example, the housing structure can be changed or the layout of the printed board can be adjusted. Taking the filtering method as an example, a finished filter can be used. However, the grounding method of changing the shell structure or adjusting the layout of the printed board is too large, and the completion cycle is long and the efficiency is low. The density and wiring density are high, and the remaining free space in the casing is limited, which makes it impossible to place the above filtering device in the domain controller, and the cost is high. How to quickly, effectively and cost-effectively pass the domain controller conducted EMI disturbance test is an urgent problem to be solved.

In order to solve the above technical problems, the inventors of the present application have found that, considering the complexity and low efficiency of the grounding method and the shielding method, (the grounding method is mainly to provide a return path for the noise source that does not pass or less passes through the external test network, so that EMI The harassment test can be solved, but the grounding method sometimes needs to be modified in combination with the shell structure, or the layout of the printed board, etc., which is contingent and complicated, and it is not easy to form a unified solution. The shielding method mainly includes shielding the noise source or shielding the entire product. Generally, Automotive electronic intelligent driving domain controllers are mostly metal shell structures, which already have shielding functions, but there are many connector cables on the metal structure. Due to the cable relationship between the connector and the connector, the shielding method cannot completely shield the noise inside the board. The separate shielding of the noise source also has similar problems, and it puts forward higher requirements on the production process, which is not easy to promote.) The filter method can be studied first. Considering the limitations of the existing filtering method (due to the fixed volume of the domain controller, the multi-function devices, the high device density and the wiring density, there is insufficient space for filters, and various finished filters on the market (mainly). Classification: active filter, passive filter; first-order filter and multi-order filter; RC filter, LC filter, RLC filter, etc.) In most cases, it cannot be directly placed in the automotive electronic intelligent driving domain due to volume reasons controller), so the research of filtering method focuses on the self-built filter. Considering that in the current method conducted EMI disturbance test of the automotive electronic intelligent driving domain controller, the level standard is Class 3, because the 150K to 50M spectrum has higher limit values and more margins, so generally exceeding the standard point occurs in 50M to 50M to 50M. In the 245M spectrum, this spectrum is mostly common mode noise. Therefore, the common mode inductance can be used as the main method, and the parameter selection of the common mode inductance can be carried out in combination with the current method conducted EMI disturbance test results, so as to achieve a fast, effective and low-cost conducted EMI disturbance test through the domain controller.

The technical solutions of the present application will be described in detail below with specific examples. The following specific embodiments may be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

FIG. 1 is a schematic flowchart 1 of a method for determining a filtering device provided by an embodiment of the present application. As shown in Figure 1, the method includes:

101. Obtain a first test result; the first test result is obtained by conducting a conducted EMI disturbance test on the first domain controller based on the current method.

The execution body of this embodiment may be a terminal device with data processing capability, for example, may be a computer, a tablet, or the like.

In practical applications, the terminal device can be connected to the conducted EMI disturbance test device to obtain the first test result, and can also download the uploaded and stored first test result from the cloud server through the network.

102. Determine a first over-standard frequency range of the first domain controller according to the first test result.

Specifically, the terminal device extracts the over-standard frequency range of the first domain controller from the first test result.

The range of the first over-standard frequency point includes at least one over-standard frequency point. Exceeding the standard frequency refers to the frequency exceeding the standard value. In a broader definition, if there is a margin requirement in the test, the insufficient margin frequency points with the margin lower than the preset threshold can also be classified as over-standard frequency points. For example, for a certain frequency, such as 100MHz, the EMI standard value is -5dBuA, and the preset threshold for margin requirement is 3dBuA, then the EMI value above -8dBuA indicates that the frequency is insufficient margin.

103. Determine the rated current of the common mode inductor according to the actual input current of the first domain controller.

Specifically, if the terminal device obtains the actual input current of the first domain controller, for example, 3A, the rated current of the common mode inductor may be set to be greater than or equal to 3A.

104. Determine the first AC resistance of the common mode inductor according to the over-standard value corresponding to the first over-standard frequency point range and the first over-standard frequency point range.

In this embodiment, the AC resistance can be selected according to the frequency spectrum characteristics of the domain controller. For example, based on the frequency spectrum characteristics, it can be known that 100Ω-1000Ω is a resistance value range corresponding to a frequency range of 50M-245M. When determining the first AC resistance, since the larger the resistance value is, the larger the size of the common mode inductor is, so it can be determined from a lower resistance value, so as to ensure that the size meets the space requirements of the domain controller.

The over-standard value corresponding to the first over-standard range refers to the amount by which the EMI value corresponding to the over-standard frequency point exceeds the standard value. For example, the EMI value is 10dBuA and the standard value is 7dBuA, then the excess value is 10-7=3dBuA.

Specifically, in an achievable manner, the over-standard value and the corresponding frequency point may be pre-stored in the terminal device, and the corresponding relationship between the AC resistance of the common-mode inductor and the corresponding relationship, after obtaining the first over-standard frequency point range, it can be based on The frequency point with the largest frequency in the first over-standard frequency point range and the first AC resistance of the selected common-mode inductor corresponding to the over-standard value; The resistance value that exceeds the standard value is input, and the resistance value is determined as the first AC resistance of the common mode inductance.

105. Determine a target size of the common mode inductance according to the space size of the first domain controller.

In this embodiment, the space size of the first domain controller determines the maximum design size of the common mode inductor. The target size of the common mode inductor should be smaller than the space size of the first domain controller.

106. Determine the common mode inductance as the first filtering device of the first domain controller, so as to perform conducted EMI filtering on the first domain controller through the first filtering device.

Specifically, after determining the rated current, AC resistance and target size of the common mode inductance, an appropriate common mode inductance can be selected from the pre-stored common mode inductances of multiple candidate types, as the first domain controller a filter device.

Exemplarily, as shown in FIG. 2 , the first filtering device 201 may be connected to the input end of the switching power supply 2021 of the first domain controller 202 , so as to perform conducted EMI filtering on the first domain controller 202 through the first filtering device 201 . .

In this embodiment, other parameters of the common mode inductance, such as withstand voltage value, rated voltage, etc., may be determined in combination with other test requirements.

In order to clearly introduce the determination principle of the filtering device, an example is described below with reference to FIG. 3 .

Illustratively, take the working voltage of the automotive electronic intelligent driving domain controller as a 12V/24V compatible system and the power consumption of 50W as an example. The current method conducted disturbance test results are shown in Figure 3. The abscissa of the coordinate system is the frequency value of the conducted EMI disturbance signal, and the ordinate is the measured value corresponding to each frequency point. The figure shows a first straight line graph, a second straight line graph, a first graph graph and a second graph graph from top to bottom. Wherein, the first straight line graph is the peak limit value, the second straight line graph is the mean value limit value, the first graph graph is the peak value curve, and the second graph graph is the mean value curve. It can be seen from the figure that there are double shoulders exceeding the standard envelope near 50MHz, there are excessive frequency points or insufficient margin frequency points near 100MHz, and there are also exceeding standard envelopes near 200MHz. From the above test results, it can be seen that the over-standard frequency points are mainly concentrated in the frequency band from 45MHz to 200MHz. In this frequency band, the rated current of the common mode inductor is ≥3A@24V according to the actual circuit usage of the domain controller, and the impedance value is 100 ohms. @45M-200M, the rated voltage is ≥300V and the size is ≤20*12*15mm according to the space size of the domain controller. A common-mode inductor that meets the above parameter requirements is connected in series to the circuit, and the conducted EMI of the domain controller is filtered through the common-mode inductor.

In the method for determining the filter device provided in this embodiment, a common mode inductance is selected as the filter element based on the test results of the EMI disturbance conducted by the AC method, and the parameter value of the common mode inductance is further determined based on the test results, which can realize fast, effective and low-cost filtering. Pass domain controller conducted EMI disturbance test.

FIG. 4 is a second schematic flowchart of a method for determining a filtering device according to an embodiment of the present application. As shown in FIG. 4 , on the basis of the embodiment shown in FIG. 1 , in this embodiment, a further filtering scheme after the common mode inductor is selected is described in detail. After step 106 , it may further include:

401. Obtain a second test result; the second test result is obtained by conducting a conducted EMI disturbance test on the second domain controller based on the current method; the second domain controller is a switching power supply that connects the first filtering device and the first domain controller obtained after connecting the input terminals.

Exemplarily, as shown in FIG. 2 , the second domain controller 20 includes a first filtering device 201 and a first domain controller 202 . The first filtering device 201 is connected to the switching power supply 2021 in the first domain controller 202 .

402. Determine a second over-standard frequency range of the second domain controller according to the second test result.

403. Adjust the first filtering device according to the second over-standard frequency range to obtain a second filtering device of the first domain controller, so as to perform conducted EMI filtering on the first domain controller through the second filtering device.

In some embodiments, adjusting the first filtering device according to the second over-standard frequency range to obtain the second filtering device of the first domain controller may include: determining according to the over-standard value within the second over-standard frequency range The second AC resistance of the common mode inductor; according to the second AC resistance, a new common mode inductor is selected; if the size of the new common mode inductor is smaller than the space size, the new common mode inductor is determined as the value of the first domain controller. second filtering means.

Optionally, determining the second AC resistance of the common-mode inductance according to the over-standard value within the range of the second over-standard frequency point may include: if the rated current of the common-mode inductance is less than the preset threshold, then according to the second over-standard frequency point range , determines the second AC resistance of the common mode inductance.

In some embodiments, adjusting the first filtering device according to the second over-standard frequency range to obtain the second filtering device of the first domain controller may include: determining the rated current of the inductance magnetic beads according to the rated current of the common mode inductor. current; determine the third AC resistance of the inductive magnetic beads according to the out-of-standard value within the second super-standard frequency point range and the second super-standard frequency point range; connect the inductive magnetic beads in series with the rear end of the common-mode inductance to obtain the first domain controller the second filter means.

Specifically, after selecting the common mode inductor as the first filter device, if there is still an over-standard frequency point based on the current method conducted EMI disturbance test result of the first domain controller installed with the first filter device, the value of the common mode inductor can be changed. AC resistance, such as replacing the current common mode inductance with a larger value common mode inductance to test again based on the new common mode inductance.

It should be noted that because the higher the AC resistance of the common mode inductance, the higher the requirements for the number of turns, volume and magnetic permeability of the magnetic core material of the common mode inductance. And the conducted EMI disturbance test results and then decide whether to replace the common mode inductor with a larger impedance value. In addition, for common mode inductors whose rated current is greater than the preset value, if the AC resistance is further increased, the rated voltage, inductor volume or magnetic core material may be greatly changed, which may not meet the space constraints of the domain controller. Therefore, in the third domain controller 501 as shown in FIG. 5 , an inductor magnetic bead 202 can be directly connected to the rear end of the first filtering device 201 (original common mode inductor) to form a simple combination of common mode inductor/magnetic bead , one end of the inductive magnetic beads 202 is connected to the first filtering device 201, and the other end is connected to the switching power supply 2021 in the first domain controller 202, so as to solve the problem that the current method conducted EMI disturbance test exceeds the standard.

404. Obtain a third test result; the third test result is obtained by conducting a conducted EMI disturbance test on the third domain controller based on the current method; the third domain controller is a switching power supply that connects the second filtering device and the first domain controller obtained after connecting the input terminals.

405. According to the third test result, determine whether the third domain controller has an over-standard frequency point, if not, perform step 406, and if so, perform step 407.

406. Determine the second filtering device as the final filtering device.

407. Adjust the second filtering device according to the out-of-standard value of the out-of-standard frequency point of the third domain controller and the out-of-standard frequency point of the third domain controller to obtain a third filtering device, so that the first domain The controller performs conducted EMI filtering.

Specifically, after obtaining the third domain controller, the test equipment can be controlled to perform the current method conducted EMI disturbance test again to obtain the third test result. If there is no over-standard frequency point in the third test result, the test is completed. If it still exists, the addition of magnetic beads or the adjustment of common mode inductance can be carried out with reference to the above-mentioned embodiment, until the new filter device obtained after adjustment can be Make the domain controller pass the conducted EMI disturbance test.

In order to clearly introduce the determination principle of the filtering device, an example is described below with reference to FIG. 6 and FIG. 7 .

As shown in Figure 6, most of the over-standard frequency points are suppressed, and there are only over-standard frequency points near 100M. The impedance characteristics of the above common mode inductance near 100M can be increased to suppress the over-standard frequency points near 100M, but for common mode with large rated current If the inductance and impedance value are increased, the rated voltage, inductance volume or magnetic core material may change greatly, which is not the best optimization solution. Based on this, for the frequency point near 100M, add an inductive magnetic bead with a rated current ≥3A and an impedance value ≥200Ω@100M and connect it in series to the back end of the above common mode inductor to test again, and get the test results shown in Figure 7. As shown in Figure 7, it can be seen that the combination of common mode inductance and magnetic beads can well solve the problem of exceeding the frequency point of current method conduction disturbance in the case of saving space and simple structure, and the margin is large.

It should be noted that, in the embodiments of the present application, the grayscales of the lines in FIG. 3 , FIG. 6 , and FIG. 7 are only used to distinguish and display different curves, and do not affect the protection scope.

In the method for determining the filter device provided in this embodiment, the parameter selection of the common mode inductor is performed first, and then a common mode inductor or a common mode inductor/magnetic bead combination with appropriate parameters is selected. The complex method can well solve the problem that the current method conducted disturbance frequency point exceeds the standard. The conducted EMI filter device of this embodiment has a simple structure, low cost, and is easy to install in a limited space in the domain controller. The filter methods are fundamentally different and have great advantages in terms of effectiveness and efficiency.

According to the power consumption, spectrum characteristics, and margin requirements of the domain controller, choose a common mode inductor with moderate volume and parameters, or a simple combination of common mode inductors and magnetic beads to solve the current difficult current-method conduction EMI of the automotive electronic intelligent driving domain controller. The harassment test frequency exceeds the standard problem, and it can be installed in the controller smoothly.

FIG. 8 is a schematic structural diagram of a device for determining a filtering apparatus according to an embodiment of the present application. As shown in FIG. 8 , the determining device 80 of the filtering apparatus includes: an obtaining module 801 and a processing module 802 .

The obtaining module 801 is configured to obtain a first test result; the first test result is obtained by conducting a conducted EMI disturbance test on the first domain controller based on the current method.

The processing module 802 is configured to determine the first over-standard frequency point range of the first domain controller according to the first test result; determine the rated current of the common mode inductor according to the actual input current of the first domain controller; according to the first over-standard frequency point The over-standard value corresponding to the range and the range of the first over-standard frequency point are used to determine the first AC resistance of the common-mode inductance; the target size of the common-mode inductance is determined according to the space size of the first domain controller; the common-mode inductance is determined as the first The first filtering device of the domain controller is used to perform conducted EMI filtering on the first domain controller through the first filtering device.

The device for determining the filter device provided by the embodiment of the present application selects a common mode inductance as a filter element based on the test results of the EMI disturbance conducted by the AC method, and further determines the parameter value of the common mode inductance based on the test results, which can achieve fast, effective and low-cost The conducted EMI disturbance test by domain controller.

The device for determining the filtering apparatus provided in the embodiment of the present application can be used to execute the above-mentioned method embodiments, and the implementation principles and technical effects thereof are similar, and details are not described herein again in this embodiment.

Embodiments of the present application further provide a filtering device, including: a first filtering device;

The first filtering device includes:

a common mode inductor, connected to the input end of the switching power supply of the first domain controller, and used for conducting conducted EMI filtering on the first domain controller;

The target size of the common mode inductor is determined according to the space size of the first domain controller; the rated current of the common mode inductor is determined according to the actual input current of the first domain controller; the first AC resistance of the common mode inductor is It is determined according to the over-standard value corresponding to the first over-standard frequency point range and the first over-standard frequency point range; the first over-standard frequency point range of the first domain controller is determined according to the first test result; the first test result is based on the current method Obtained by conducting conducted EMI disturbance tests on the first domain controller.

Optionally, the filtering device may include: a second filtering device;

The second filtering device is obtained by adjusting the first filtering device according to the second over-standard frequency range;

The second over-standard frequency range of the second domain controller is determined according to the second test result; the second test result is obtained by conducting a conducted EMI disturbance test on the second domain controller based on the current method; the second domain controller is obtained by connecting the first filtering device to the input end of the switching power supply of the first domain controller.

Optionally, the second filtering device is determined according to the new common mode inductance when the size of the new common mode inductance is smaller than the space size; the new common mode inductance is selected according to the second AC resistance; The second AC resistance is determined according to the over-standard value within the second over-standard frequency point range.

Optionally, the second AC resistance of the common-mode inductor is determined according to an over-standard value within the range of the second over-standard frequency point when the rated current of the common-mode inductor is smaller than a preset threshold value.

Optionally, the second filtering device of the first domain controller is obtained by connecting the inductive magnetic beads in series with the rear end of the common-mode inductor, and the third AC resistance of the inductive magnetic beads is based on the exceeding standard within the range of the second exceeding standard frequency point. value and the range of the second over-standard frequency point; the rated current of the inductor bead is determined according to the rated current of the common mode inductor.

Optionally, the filtering device may further include a third filtering device;

The third filtering device is obtained by adjusting the second filtering device according to the over-standard value of the over-standard frequency point of the third domain controller and the over-standard frequency point of the third domain controller when there is an over-standard frequency point in the third domain controller. ; The third test result is obtained by conducting a conducted EMI disturbance test on the third domain controller based on the current method; the third domain controller is obtained by connecting the second filtering device to the input end of the switching power supply of the first domain controller .

The filtering device provided in the embodiment of the present application is obtained by executing the above-mentioned method embodiment, and the implementation principle and technical effect thereof are similar, and details are not described herein again in this embodiment.

FIG. 9 is a structural block diagram of a device for determining a filtering apparatus provided in an embodiment of the present application, and the device may be a computer, a tablet device, or the like.

Device 90 may include one or more of the following components: processing component 901 , memory 902 , power supply component 903 , multimedia component 904 , audio component 905 , input/output (I/O) interface 906 , sensor component 907 , and communication component 908 .

The processing component 901 generally controls the overall operation of the device 90, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 901 may include one or more processors 909 to execute instructions to perform all or part of the steps of the methods described above. Additionally, processing component 901 may include one or more modules to facilitate interaction between processing component 901 and other components. For example, processing component 901 may include a multimedia module to facilitate interaction between multimedia component 904 and processing component 901 .

Memory 902 is configured to store various types of data to support operation at device 90 . Examples of such data include instructions for any application or method operating on device 90, contact data, phonebook data, messages, pictures, videos, and the like. Memory 902 may be implemented by any type of volatile or non-volatile storage device or combination thereof, such as static random access memory (SRAM), electrically erasable programmable read only memory (EEPROM), erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic Disk or Optical Disk.

Power supply assembly 903 provides power to the various components of device 90 . Power supply components 903 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to device 90 .

Multimedia component 904 includes screens that provide an output interface between device 90 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touch, swipe, and gestures on the touch panel. A touch sensor can sense not only the boundaries of a touch or swipe action, but also the duration and pressure associated with the touch or swipe action. In some embodiments, the multimedia component 904 includes a front-facing camera and/or a rear-facing camera. When the apparatus 90 is in an operation mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each of the front and rear cameras can be a fixed optical lens system or have focal length and optical zoom capability.

Audio component 905 is configured to output and/or input audio signals. For example, audio component 905 includes a microphone (MIC) that is configured to receive external audio signals when device 90 is in operating modes, such as call mode, recording mode, and voice recognition mode. The received audio signal may be further stored in memory 902 or transmitted via communication component 908 . In some embodiments, audio component 905 also includes a speaker for outputting audio signals.

The I/O interface 906 provides an interface between the processing component 901 and a peripheral interface module, which may be a keyboard, a click wheel, a button, or the like. These buttons may include, but are not limited to: home button, volume buttons, start button, and lock button.

Sensor assembly 907 includes one or more sensors for providing status assessment of various aspects of device 90 . For example, the sensor assembly 907 can detect the open/closed state of the device 90, the relative positioning of the components, such as the display and keypad of the device 90, the sensor assembly 907 can also detect the position change of the device 90 or a component of the device 90, the user The presence or absence of contact with the device 90, the orientation or acceleration/deceleration of the device 90 and the temperature change of the device 90. Sensor assembly 907 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. Sensor assembly 907 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 907 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor or a temperature sensor.

Communication component 908 is configured to facilitate wired or wireless communication between apparatus 90 and other devices. Device 90 may access wireless networks based on communication standards, such as WiFi, 2G or 3G, or a combination thereof. In one exemplary embodiment, the communication component 908 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 908 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, apparatus 90 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable A gate array (FPGA), controller, microcontroller, microprocessor or other electronic component implementation for performing the above method.

In an exemplary embodiment, there is also provided a non-transitory computer-readable storage medium including instructions, such as a memory 902 including instructions, executable by the processor 909 of the apparatus 90 to perform the method described above. For example, the non-transitory computer-readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like.

The above-mentioned computer-readable storage medium, the above-mentioned readable storage medium can be realized by any type of volatile or non-volatile storage device or their combination, such as static random access memory (SRAM), electrically erasable Programmable Read Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Read Only Memory (PROM), Read Only Memory (ROM), Magnetic Memory, Flash Memory, Magnetic Disk or Optical Disk. A readable storage medium can be any available medium that can be accessed by a general purpose or special purpose computer.

An exemplary readable storage medium is coupled to the processor such that the processor can read information from, and write information to, the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium may be located in application specific integrated circuits (Application Specific Integrated Circuits, ASIC for short). Of course, the processor and the readable storage medium may also exist in the device as discrete components.

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by program instructions related to hardware. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps including the above method embodiments are executed; and the foregoing storage medium includes: ROM, RAM, magnetic disk or optical disk and other media that can store program codes.

Embodiments of the present application also provide a computer program product, including a computer program, when the computer program is executed by a processor, the above-mentioned filtering device determining device implements the filtering device determining method.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. scope.

Claims (10)

1. a method for determining a filtering device, comprising: obtaining a first test result; the first test result is obtained by conducting a conducted EMI disturbance test on the first domain controller based on the current method; According to the first test result, determine the first over-standard frequency range of the first domain controller; Determine the rated current of the common mode inductor according to the actual input current of the first domain controller; determining the first alternating current resistance of the common mode inductor according to the over-standard value corresponding to the first over-standard frequency point range and the first over-standard frequency point range; determining the target size of the common mode inductor according to the space size of the first domain controller; The common mode inductance is determined as a first filtering device of the first domain controller, so as to perform conducted EMI filtering on the first domain controller through the first filtering device. 2. The method according to claim 1, wherein the method further comprises: Obtain a second test result; the second test result is obtained by conducting a conducted EMI disturbance test on a second domain controller based on the current method; the second domain controller is obtained by combining the first filtering device with the first Obtained after the input end of the switching power supply of the domain controller is connected; According to the second test result, determine the second over-standard frequency range of the second domain controller; Adjusting the first filtering device according to the second over-standard frequency range to obtain a second filtering device of the first domain controller, so as to use the second filtering device to filter the first domain controller Conduct conducted EMI filtering. 3 . The method according to claim 2 , wherein the first filtering device is adjusted according to the second over-standard frequency range to obtain the second filtering device of the first domain controller. 4 . ,include: determining the second AC resistance of the common mode inductor according to the over-standard value within the range of the second over-standard frequency point; selecting a new common mode inductance according to the second alternating current resistance; If the size of the new common mode inductor is smaller than the space size, the new common mode inductor is determined as the second filtering device of the first domain controller. 4 . The method according to claim 3 , wherein, determining the second AC resistance of the common mode inductor according to the over-standard value in the range of the second over-standard frequency point, comprising: 5 . If the rated current of the common mode inductance is less than the preset threshold, the second AC resistance of the common mode inductance is determined according to the out-of-standard value in the range of the second out-of-standard frequency point. 5 . The method according to claim 2 , wherein the first filtering device is adjusted according to the second over-standard frequency range to obtain the second filtering device of the first domain controller. 6 . ,include: Determine the rated current of the inductor magnetic beads according to the rated current of the common mode inductor; determining the third alternating current resistance of the inductive magnetic beads according to the over-standard value within the second over-standard frequency point range and the second over-standard frequency point range; The inductive magnetic beads are connected in series at the rear end of the common mode inductance to obtain the second filtering device of the first domain controller. 6. The method according to any one of claims 2-5, wherein the method further comprises: Obtain a third test result; the third test result is obtained by conducting a conducted EMI disturbance test on a third domain controller based on the current method; the third domain controller is obtained by combining the second filtering device with the first Obtained after the input end of the switching power supply of the domain controller is connected; According to the third test result, determine whether the third domain controller has an over-standard frequency point; In the case that the third domain controller does not have an over-standard frequency point, the second filtering device is determined as the final filtering device. 7. The method according to claim 6, wherein the method further comprises: In the case that the third domain controller has an over-standard frequency point, according to the over-standard value of the over-standard frequency point of the third domain controller and the over-standard frequency point of the third domain controller, the second The filtering means is adjusted to obtain a third filtering means for conducting conducted EMI filtering on the first domain controller through the third filtering means. 8. A filtering device, characterized in that, comprising: a common mode inductor, connected to the input end of the switching power supply of the first domain controller, and used for conducting conducted EMI filtering on the first domain controller; Wherein, the target size of the common mode inductor is determined according to the space size of the first domain controller; the rated current of the common mode inductor is determined according to the actual input current of the first domain controller; the The first AC resistance of the common mode inductor is determined according to the over-standard value corresponding to the first over-standard frequency point range and the first over-standard frequency point range; the first over-standard frequency point range of the first domain controller is determined according to the first over-standard frequency point range. A test result is determined; the first test result is obtained by conducting a conducted EMI disturbance test on the first domain controller based on the current method. 9. A device for determining a filtering device, comprising: at least one processor and a memory; the memory stores computer-executable instructions; The at least one processor executes the computer-executable instructions stored in the memory, causing the at least one processor to perform a method of determining a filtering apparatus as claimed in any one of claims 1 to 7. 10. A computer-readable storage medium, characterized in that, computer-executable instructions are stored in the computer-readable storage medium, and when a processor executes the computer-executable instructions, the computer-executable instructions as claimed in any one of claims 1 to 7 are implemented. The method for determining the filtering device described above.

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