CN111353265B - Matlab GUI platform-based EMI filter insertion loss simulation system and method - Google Patents
Matlab GUI platform-based EMI filter insertion loss simulation system and method Download PDFInfo
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- CN111353265B CN111353265B CN202010236761.2A CN202010236761A CN111353265B CN 111353265 B CN111353265 B CN 111353265B CN 202010236761 A CN202010236761 A CN 202010236761A CN 111353265 B CN111353265 B CN 111353265B
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- 238000004364 calculation method Methods 0.000 claims abstract description 40
- 238000004422 calculation algorithm Methods 0.000 claims abstract description 21
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
Abstract
The invention discloses an EMI filter insertion loss simulation system and method based on Matlab GUI platform, belonging to the technical field of software and used for solving the technical problem of inaccurate simulation of complex magnetic device or source load impedance high-frequency circuit model, the system comprises: the filtering circuit topology selection module is used for selecting the filtering circuit topology; the parameter input module is used for inputting parameters of components of the filter circuit; the compensation module is used for compensating parasitic parameters of leads among components of the filter circuit; the parameter input module is used for inputting impedance parameters of the source end and the load end; the insertion loss calculation module is used for determining an insertion loss analysis algorithm according to the filter circuit, determining impedance-frequency response of each part according to the filter circuit components and input impedance parameters of the source end and the load end, further obtaining a filter circuit impedance matrix, and substituting the impedance matrix into the insertion loss analysis algorithm to perform insertion loss calculation. The invention has the advantages of accurate simulation, simple and convenient operation, convenience, quickness and the like.
Description
Technical Field
The invention mainly relates to the technical field of software, in particular to an EMI filter insertion loss simulation system and method based on a Matlab GUI platform.
Background
At present, commercial EMC circuit simulation software (including Ansys-simplore, saber, ADS and the like) faces the problem that a magnetic device or a source load impedance high-frequency circuit model is difficult to build and the simulation result is inaccurate when the filtering insertion loss simulation of a complex magnetic device is solved or the insertion loss under the condition that different source load impedance needs to be calculated is solved.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: aiming at the technical problems existing in the prior art, the invention provides an EMI filter insertion loss simulation system and method based on a Matlab GUI platform, which are efficient, accurate, simple and convenient to operate.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
an EMI filter insertion loss simulation system based on a Matlab GUI platform, comprising:
the filtering circuit topology selection module is used for selecting the filtering circuit topology;
the parameter input module is used for inputting parameters of components of the filter circuit;
the compensation module is used for compensating parasitic parameters of leads among components of the filter circuit;
the parameter input module is used for inputting impedance parameters at the source end and the load end;
the insertion loss calculation module is used for determining an insertion loss analysis algorithm according to the filter circuit, determining impedance-frequency response functions of all parts according to the element parameters of the filter circuit and the input impedance parameters of the source end and the load end, further obtaining an impedance matrix of the filter circuit, and substituting the impedance matrix into the insertion loss analysis algorithm to perform insertion loss calculation.
As a further improvement of the above technical scheme:
the filter circuit topology comprises a single-stage LC circuit, a single-stage CL circuit, a single-stage T-type circuit, a single-stage PI-type circuit, a two-stage LCLC circuit, a two-stage CLCL circuit and a two-stage PI-type circuit.
The invention also discloses a simulation method of the EMI filter insertion loss simulation system based on the Matlab GUI platform, which comprises the following steps:
1) The filter circuit topology selection module selects a filter circuit topology;
2) The parameter input module inputs parameters of components of the filter circuit;
3) The compensation module compensates parasitic parameters of leads among components of the filter circuit;
4) The parameter input module inputs impedance parameters at the input source end and the input load end;
5) The insertion loss calculation module determines an insertion loss analysis algorithm according to the filter circuit, determines impedance-frequency response functions of all parts according to element parameters of the filter circuit and input impedance parameters of a source end and a load end, further obtains an impedance matrix of the filter circuit, and substitutes the impedance matrix into the insertion loss analysis algorithm to perform insertion loss calculation.
As a further improvement of the above technical scheme:
in step 2), the input modes of the parameters of the components of the filter circuit include three modes, which are respectively:
the direct parameter input mode is to input parameters in the form of equivalent capacitance, equivalent inductance and equivalent resistance of the filter circuit components to obtain impedance-frequency response functions of the filter circuit components;
calling components in a module library, establishing a filter circuit component model library, directly calling component models from the model library, and storing the filter component models in library files in a mode of impedance-frequency response functions;
the external instrument is used for leading in, and the external test instrument is used for directly leading in the impedance test data of the filter circuit components.
When the components are called in the module library, the least square-based vector matching algorithm is adopted to carry out numerical fitting on impedance test data of the magnetic device, and an impedance-frequency response function is obtained after fitting.
When an external instrument is introduced, vector matching fitting is carried out on the impedance test data of the introduced filter circuit component, and the impedance-frequency response function of four orders is extracted.
The lead in the step 3) comprises a cable and a busbar.
In step 4), the input of the source and load impedance parameters includes two input modes:
direct parameter input, which is performed in the form of equivalent resistance, equivalent inductance and equivalent capacitance;
and (3) importing external instrument test data, supporting the test data importing of the impedance analyzer and the vector network analyzer, and substituting the test data into the final insertion loss calculation in the form of discrete frequency-impedance points.
Compared with the prior art, the invention has the advantages that:
the invention is based on Matlab GUI platform, adopts the mode of program analysis and calculation, can accurately represent the high-frequency characteristics of magnetic devices and source load impedance through a vector matching algorithm, and avoids the condition of insertion loss simulation by constructing a complex filter circuit, so that the whole simulation calculation is more efficient and accurate, and the auxiliary design is more convenient.
The invention solves the modeling problem when the common commercial circuit simulation system carries out filtering insertion loss simulation on complex magnetic devices, adopts an analytic calculation mode, directly skips over a circuit modeling link, characterizes the magnetic devices into an impedance-frequency response function form, has higher calculation precision, and greatly reduces the early modeling time of the filtering insertion loss simulation calculation.
The invention solves the modeling problem when common commercial circuit simulation software carries out filter insertion loss simulation on actual source load, adopts an analytic calculation mode, skips circuit modeling links, can directly import impedance test data of a source end and a load end to carry out analytic calculation of filter insertion loss, has higher calculation precision, and is more beneficial to predicting filter insertion loss under the condition of complex source load in actual engineering.
Drawings
Fig. 1 is a block diagram of a system in an embodiment of the present invention.
FIG. 2 is a schematic diagram of a system interface according to an embodiment of the present invention.
Fig. 3 is a circuit schematic of the various filter circuit topologies of the present invention.
Fig. 4 is a schematic diagram of a direct input mode of parameters of a filtering component according to the present invention.
Fig. 5 is a diagram of an equivalent calculation model of an inductance-based device according to the present invention.
Fig. 6 is a diagram of an equivalent calculation model of a capacitive device according to the present invention.
Fig. 7 is a model library of filter components of the present invention.
Fig. 8 is a diagram showing the introduction of impedance test data for components of the external device according to the present invention.
Fig. 9 is a filtering topology diagram of the parasitic parameters of the leads between the filtering components of the present invention.
Fig. 10 is a diagram of a parasitic parametric model of a lead in accordance with the present invention.
Fig. 11 is a schematic diagram of source and load parameter input and insertion loss calculation according to the present invention.
Fig. 12 is a schematic diagram of filtering insertion loss calculation according to the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific examples.
As shown in fig. 1, the EMI filter insertion loss simulation system based on Matlab GUI platform of this embodiment includes:
the filtering circuit topology selection module is used for selecting the filtering circuit topology;
the parameter input module is used for inputting parameters of components of the filter circuit;
the compensation module is used for compensating parasitic parameters of leads among components of the filter circuit;
the parameter input module is used for inputting impedance parameters at the source end and the load end;
the insertion loss calculation module is used for determining an insertion loss analysis algorithm according to the filter circuit, determining impedance-frequency response functions of all parts according to input impedance parameters of the filter circuit components and the source end and the load end, further obtaining a filter circuit impedance matrix, and substituting the impedance matrix into the insertion loss analysis algorithm to perform insertion loss calculation.
As shown in fig. 3, in this embodiment, the filter circuit topology includes a single-stage LC circuit, a single-stage CL circuit, a single-stage T-type circuit, a single-stage PI-type circuit, a two-stage LCLC circuit, a two-stage CLCL circuit, and a two-stage PI-type circuit, which correspond to (a) - (g) in fig. 3, respectively.
As shown in fig. 12, the invention also discloses a simulation method of the EMI filter insertion loss simulation system based on the Matlab GUI platform, which comprises the following steps:
1) The filtering circuit topology selection module selects a filtering circuit topology;
2) The parameter input module inputs parameters of components of the filter circuit;
3) The compensation module compensates parasitic parameters of leads among components of the filter circuit;
4) The parameter input module inputs impedance parameters at the source end and the load end;
5) The insertion loss calculation module determines an insertion loss analysis algorithm according to the filter circuit, determines impedance-frequency response functions of all parts according to input impedance parameters of components of the filter circuit and the source end and the load end, further obtains a filter circuit impedance matrix, and substitutes the impedance matrix into the insertion loss analysis algorithm to perform insertion loss calculation.
The invention is based on Matlab GUI platform, adopts the mode of program analysis and calculation, can accurately represent the high-frequency characteristics of magnetic devices and source load impedance through a vector matching algorithm, and avoids the condition of insertion loss simulation by constructing a complex filter circuit, so that the whole simulation calculation is more efficient and accurate, and the auxiliary design is more convenient.
The invention solves the modeling problem when the common commercial circuit simulation system carries out filtering insertion loss simulation on complex magnetic devices, adopts an analytic calculation mode, directly skips over a circuit modeling link, characterizes the magnetic devices into an impedance-frequency response function form, has higher calculation precision, and greatly reduces the early modeling time of the filtering insertion loss simulation calculation.
The invention solves the modeling problem when common commercial circuit simulation software carries out filter insertion loss simulation on actual source load, adopts an analytic calculation mode, skips circuit modeling links, can directly import impedance test data of a source end and a load end to carry out analytic calculation of filter insertion loss, has higher calculation precision, and is more beneficial to predicting filter insertion loss under the condition of complex source load in actual engineering.
The simulation system and method of the present invention are further described in conjunction with a specific embodiment:
1) Filter circuit topology selection
The simulation calculation of 7 filtering topology circuits is supported, wherein the simulation calculation comprises a single-stage LC circuit, a single-stage CL circuit, a single-stage T-type circuit, a single-stage PI-type circuit, a two-stage LCLC circuit, a two-stage CLCL circuit and a two-stage PI-type circuit, and the topologies of the circuits are shown in figure 3. Of course, in other embodiments, other types of filter circuits may be employed.
2) Filter circuit component parameter input
Three filter element parameter input modes are supported:
1. a parameter direct input mode (equivalent parasitic inductance, equivalent parasitic capacitance, equivalent parasitic resistance);
2. calling components from a model library;
3. impedance test data from an external instrument is imported.
The implementation of the parameter input modes of three filtering components will be described below:
1. direct input of filter component parameters
And (3) inputting parameters in the forms of equivalent capacitance (ESC), equivalent inductance (ESL) and equivalent resistance (ESR) of the filter element to obtain the impedance-frequency response function of the filter element. Equivalent computational models of the inductive and capacitive devices are shown in fig. 5 and 6.
2. Calling components from model libraries
As shown in fig. 7, a model library of filter components is created, and component models can be directly called from the model library, and the filter component models are stored in a library file in a mode of impedance-frequency response function. In order to obtain the impedance-frequency response function of a complex magnetic device (such as common-mode inductance, magnetic ring and the like), carrying out numerical fitting on impedance test data of the magnetic device by adopting a least square-based vector matching algorithm;
3. impedance test data import from external instruments
As shown in fig. 8, supporting direct introduction of impedance test data for the filter components from external test instruments, alternative test instruments include an agilent 4294A impedance analyzer and a rodschwaltz ZNB4 vector network analyzer; vector matching fitting is carried out on the imported impedance data, and the imported impedance data is extracted into a fourth-order impedance-frequency response function;
3) Lead parasitic parameter compensation between filter components
Taking the influence of parasitic parameter effects of connecting wires (cables or bus bars) among the filter components on the filter insertion loss into consideration, parasitic parameter compensation can be carried out on leads (such as cables in fig. 9) among the components; the lead wire carries out parameter input in the form of equivalent inductance and equivalent resistance, and a parasitic parameter model of the lead wire is shown in fig. 10.
4) Source side and load side parameter input
As shown in fig. 10, the source and load impedance parameters support two input modes:
1. direct parameter input (parameter input in the form of equivalent resistance, equivalent inductance, equivalent capacitance);
2. external instrument test data import (support impedance analyzer and vector network analyzer test data import, substituting into the final insertion loss calculation in the form of discrete frequency-impedance points);
5) Calculating insertion loss: and determining an insertion loss analysis algorithm according to the filter circuit, determining impedance-frequency response functions of all parts according to input parameters of the filter element and the source end and the load end, further obtaining a filter circuit impedance matrix, and substituting the impedance matrix into the analysis algorithm to perform insertion loss calculation, wherein the whole flow is shown in fig. 12.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (10)
1. An EMI filter insertion loss simulation system based on a Matlab GUI platform, comprising:
the filtering circuit topology selection module is used for selecting the filtering circuit topology;
the parameter input module is used for inputting parameters of components of the filter circuit;
the compensation module is used for compensating parasitic parameters of leads among components of the filter circuit;
the parameter input module is used for inputting impedance parameters at the source end and the load end;
the insertion loss calculation module is used for determining an insertion loss analysis algorithm according to the filter circuit, determining impedance-frequency response functions of all parts according to the element parameters of the filter circuit and the input impedance parameters of the source end and the load end, further obtaining an impedance matrix of the filter circuit, and substituting the impedance matrix into the insertion loss analysis algorithm to perform insertion loss calculation;
the filter circuit topology comprises a single-stage LC circuit, a single-stage CL circuit, a single-stage T-type circuit, a single-stage PI-type circuit, a two-stage LCLC circuit, a two-stage CLCL circuit and a two-stage PI-type circuit.
2. A simulation method of an EMI filter insertion loss simulation system based on a Matlab GUI platform according to claim 1, comprising the steps of:
1) The filter circuit topology selection module selects a filter circuit topology;
2) The parameter input module inputs parameters of components of the filter circuit;
3) The compensation module compensates parasitic parameters of leads among components of the filter circuit;
4) The parameter input module inputs impedance parameters at the input source end and the input load end;
5) The insertion loss calculation module determines an insertion loss analysis algorithm according to the filter circuit, determines impedance-frequency response functions of all parts according to element parameters of the filter circuit and input impedance parameters of a source end and a load end, further obtains an impedance matrix of the filter circuit, and substitutes the impedance matrix into the insertion loss analysis algorithm to perform insertion loss calculation.
3. The simulation method according to claim 2, wherein in step 2), the input modes of the parameters of the components of the filter circuit include a direct input mode of parameters: and inputting parameters in the form of equivalent capacitance, equivalent inductance and equivalent resistance of the filter element to obtain the impedance-frequency response function of the filter circuit element.
4. The simulation method according to claim 2, wherein in step 2), the input mode of the component parameters of the filter circuit includes calling the component from the module library: and establishing a filter circuit component model library, directly calling a component model from the model library, and storing the filter component model in a library file in a mode of impedance-frequency response function.
5. The simulation method of claim 4, wherein when components are called in the module library, a least squares-based vector matching algorithm is adopted to perform numerical fitting on impedance test data of the magnetic device, and an impedance-frequency response function is obtained after fitting.
6. The simulation method according to claim 2, wherein in step 2), the input mode of the parameters of the filter circuit component includes the input from an external instrument: impedance test data of the filter circuit components is directly imported from an external test instrument.
7. The simulation method according to claim 6, wherein the vector matching fitting is performed on the impedance test data of the introduced filter circuit component when the external instrument is introduced, and the impedance-frequency response function is extracted as a fourth-order impedance-frequency response function.
8. Simulation method according to any of the claims 2-7, wherein the leads in step 3) comprise cables and busbar.
9. A simulation method according to any of claims 2-7, wherein in step 4) the source and load side impedance parameter inputs comprise direct parameter inputs: and parameter input is performed in the forms of equivalent resistance, equivalent inductance and equivalent capacitance.
10. A simulation method according to any of claims 2-7, wherein in step 4) the source side and load side impedance parameter inputs comprise the importation of test data from external instrumentation: the test data of the supporting impedance analyzer and the vector network analyzer are imported and substituted into the final insertion loss calculation in the form of discrete frequency-impedance points.
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| CN117391019B (en) * | 2023-10-18 | 2024-03-22 | 广州市德珑电子器件有限公司 | Simulation test method, device, equipment and medium for EMI power filter |
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