CN115422792A - Method, device, equipment and medium for analyzing electromagnetic interference of switching power supply - Google Patents
Method, device, equipment and medium for analyzing electromagnetic interference of switching power supply Download PDFInfo
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Abstract
The embodiment of the application discloses a method, a device, equipment and a medium for analyzing electromagnetic interference of a switching power supply module, wherein the method comprises the following steps: acquiring a circuit topological structure and port information of a switching power supply module; obtaining internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topological structure and the port information; establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters; and performing electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model. In other words, the method calculates the parameters of each internal device through the topological structure and the macroscopic port information of the switch power supply module, and then builds a simulation model with the same electrical performance as the actual power supply. The modeling simulation research of the switching power supply can be realized without directly obtaining detailed information such as a schematic diagram of an internal circuit of the switching power supply module and parameters of each device.
Description
Technical Field
The invention relates to the technical field of aviation electric control, in particular to an electromagnetic interference analysis method, device, equipment and medium of a switching power supply.
Background
Power electronics are important components of avionics systems, and for power electronics, one of the most critical issues is the problem of electromagnetic compatibility. Electromagnetic compatibility refers to the ability of a device to function properly in its electromagnetic environment without generating intolerable electromagnetic interference to other devices, so EMC (External Memory Controller) contains two things: firstly, the Electromagnetic interference generated in a normal working state cannot exceed a specified limit, and secondly, the Electromagnetic interference has a certain resistance to the Electromagnetic interference, namely EMS (Electromagnetic Susceptibility). Among them, as an important component of modern power electronic equipment, the electromagnetic interference of the switching power supply is closely related to the EMC of the system. A core device power switch tube in the switch power supply can cause very strong current and voltage jump when working under the high-frequency on-off state, the phenomenon is expressed in a time domain as a sharp peak pulse with a steep rising edge, rich high-frequency signal components are analyzed from a frequency domain angle, and the electromagnetic interference is formed by inevitable action of parasitic parameters in a circuit. Therefore, in the design of the avionics system, the modeling simulation research of the switching power supply is very important.
However, in actual operation, to perform modeling simulation on electromagnetic interference of the switching power supply module, detailed information, such as a schematic diagram of a circuit and parameters of each device, must be acquired. For a number of objective reasons, it is often difficult to obtain such detailed information, so that modeling simulation studies on switching power supplies cannot be realized in such cases.
Disclosure of Invention
The application mainly aims to provide an electromagnetic interference analysis method, device, equipment and medium of a switching power supply, and aims to solve the technical problem that in the prior art, the point position correction efficiency of a horizontal measurement movable control surface is low.
In order to achieve the above object, the present application provides a method for analyzing electromagnetic interference of a switching power supply module, including:
acquiring a circuit topological structure and port information of a switching power supply module;
obtaining internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topological structure and the port information;
establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters;
and performing electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model.
Optionally, the step of obtaining internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topology and the port information includes:
determining a topology type of the circuit topology;
and based on the design rule and the constraint condition of the parameters of the components in the topology type, obtaining the internal circuit parameters and the parasitic parameters of the switch power supply module by using the port information.
Optionally, the port information includes an input voltage, an output current, a switching frequency, and an output voltage ripple.
Optionally, the step of establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topology, the internal circuit parameters, and the parasitic parameters includes:
and calling simulation software, and connecting components in the simulation software according to the circuit topological structure, so as to establish an electromagnetic interference simulation model of the switching power supply module. .
In addition, in order to achieve the above object, the present application further provides an electromagnetic interference analysis method of a switching power panel, the method including:
obtaining electromagnetic interference simulation models of a plurality of switching power supply modules according to the electromagnetic interference analysis method;
establishing a symbol file and a model file of each switching power supply module according to the electromagnetic interference simulation model of each switching power supply module;
establishing a simulation model library comprising a plurality of basic unit models based on the symbol file and the model file;
establishing an electromagnetic interference simulation model of the switching power panel based on the basic unit model in the simulation model library;
and performing electromagnetic interference analysis on the switching power panel based on the electromagnetic interference simulation model of the switching power panel.
Optionally, the step of establishing an electromagnetic interference simulation model of the switching power panel based on the basic unit model in the simulation model library includes:
calling the basic unit models in the simulation model library to realize the conducted electromagnetic interference modeling simulation of the switching power supply boards with different combination types;
and extracting interference signals in the conducted electromagnetic interference modeling simulation and parasitic parameters of the switching power supply board so as to establish an electromagnetic interference simulation model of the switching power supply board.
In addition, in order to achieve the above object, the present application also provides an electromagnetic interference analysis apparatus of a switching power supply module, including:
the information acquisition module is used for acquiring the circuit topological structure and the port information of the switching power supply module;
a parameter obtaining module, configured to obtain internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topology and the port information;
the simulation modeling module is used for establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters;
and the first analysis module is used for carrying out electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model.
In addition, in order to achieve the above object, the present application further provides an electromagnetic interference analyzing apparatus for a switching power supply board, comprising:
the first modeling module is used for obtaining electromagnetic interference simulation models of the plurality of switching power supply modules according to the electromagnetic interference analysis method;
the file establishing module is used for establishing a symbol file and a model file of the switching power supply module according to the electromagnetic interference simulation model of each switching power supply module;
the simulation library building module is used for building a simulation model library comprising a plurality of basic unit models based on the symbol file and the model file;
the second modeling module is used for establishing an electromagnetic interference simulation model of the switching power panel based on the basic unit model in the simulation model library;
and the second analysis module is used for carrying out electromagnetic interference analysis on the switching power panel based on the electromagnetic interference simulation model of the switching power panel.
In addition, to achieve the above object, the present application further provides a computer device, which includes a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the above method.
In addition, to achieve the above object, the present application further provides a computer readable storage medium, where a computer program is stored, and a processor executes the computer program to implement the above method.
The beneficial effect that this application can realize.
The embodiment of the application provides a method, a device, equipment and a medium for analyzing electromagnetic interference of a switching power supply module, wherein the method comprises the following steps: acquiring a circuit topological structure and port information of a switching power supply module; obtaining internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topological structure and the port information; establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters; and performing electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model. That is, the method calculates the parameters of each internal device through the topological structure and the macroscopic port information of the switch power supply module, and then builds a simulation model with the same electrical performance as the actual power supply. The modeling simulation research of the switching power supply can be realized without directly obtaining detailed information such as a schematic diagram of an internal circuit of the switching power supply module and parameters of each device.
Drawings
FIG. 1 is a schematic diagram of a computer device in a hardware operating environment according to an embodiment of the present application;
fig. 2 is a schematic flowchart of an electromagnetic interference analysis method of a switching power supply module according to an embodiment of the present disclosure;
FIG. 3 is a schematic flow chart of one embodiment of S40 of FIG. 2;
fig. 4 is a schematic diagram of a simulation model of a main circuit part of a flyback DC/DC switching power supply module in the embodiment of the present application;
FIG. 5 is a schematic diagram of an experimental test in an embodiment of the present application;
fig. 6 is a schematic flowchart of an electromagnetic interference analysis method for a switching power panel according to an embodiment of the present application;
fig. 7 is a functional block diagram of an electromagnetic interference analysis apparatus of a switching power supply module according to an embodiment of the present application;
fig. 8 is a schematic functional block diagram of an electromagnetic interference analysis apparatus for a switching power panel according to an embodiment of the present application.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of and not restrictive on the broad application.
The main solution of the embodiment of the application is as follows: the method comprises the steps of obtaining a circuit topological structure and port information of a switching power supply module; obtaining internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topological structure and the port information; establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters; and performing electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model.
In the prior art, power electronic equipment is an important component in an avionics system, and for the power electronic equipment, the problem of electromagnetic compatibility is one of the most critical problems. Electromagnetic compatibility refers to the ability of a device to function properly in its electromagnetic environment without producing intolerable electromagnetic interference to other devices, so EMC contains two things: firstly, the electromagnetic interference generated in the normal working state can not exceed the specified limit value; and secondly, the EMS has certain resistance to electromagnetic interference, namely electromagnetic sensitivity. With the increasingly complex electromagnetic environment, the EMC problem faced by electronic equipment is more severe, and relevant organizations have established a series of EMC standards. For example, the electromagnetic compatibility standard is CISPR-22 established by CISPR internationally, EN55014 established by the European Union, and the like. Relevant electromagnetic compatibility standards in China include national standard GB and national military standard GJB series. As an important component of modern power electronics, switching power supplies have electromagnetic interference which is closely related to the EMC of the system. A core device power switch tube in the switch power supply can cause very strong current and voltage jump when working under the high-frequency on-off state, the phenomenon is expressed in a time domain as a sharp peak pulse with a steep rising edge, rich high-frequency signal components are analyzed from a frequency domain angle, and the electromagnetic interference is formed by inevitable action of parasitic parameters in a circuit. Therefore, in the design of an avionics system, modeling of a switching power supply is important. For modeling and simulating the electromagnetic interference of the switching power supply module, detailed information of the electromagnetic interference, such as a schematic diagram of a circuit, parameters of each device and the like, must be acquired. Due to objective reasons such as intellectual property protection and the like, it is usually difficult to obtain such detailed information, and the topological structure type and macroscopic port parameter information such as input voltage, output current and the like can only be obtained by referring to a technical manual, so that the modeling simulation research on the switching power supply cannot be realized in such a case.
Therefore, the application provides a solution, and provides an electromagnetic interference analysis method of the switch power supply module, the method calculates parameters of each internal device through a topological structure and macroscopic port information of the switch power supply module, and then a simulation model which is the same as the electrical performance of an actual power supply is built. The modeling simulation research of the switching power supply can be realized without directly obtaining detailed information such as a schematic diagram of an internal circuit of the switching power supply module and parameters of each device.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a computer device in a hardware operating environment according to an embodiment of the present application.
As shown in fig. 1, the computer apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory, or a Non-Volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in FIG. 1 is not intended to be limiting of computer devices and may include more or fewer components than shown, or some components may be combined, or a different arrangement of components.
As shown in fig. 1, a memory 1005, which is a storage medium, may include therein an operating system, a data storage module, a network communication module, a user interface module, and an electronic program.
In the computer device shown in fig. 1, the network interface 1004 is mainly used for data communication with a network server; the user interface 1003 is mainly used for data interaction with a user; the processor 1001 and the memory 1005 in the computer device according to the present invention may be provided in a computer device, and the computer device calls the switching power supply module and the electromagnetic interference analysis apparatus of the switching power supply board stored in the memory 1005 through the processor 1001, and executes the electromagnetic interference analysis method of the switching power supply module and the switching power supply board provided in the embodiments of the present application.
Referring to fig. 2, based on the hardware environment of the foregoing embodiment, an embodiment of the present application provides an electromagnetic interference analysis method for a switching power supply module, including:
and S20, acquiring the circuit topology structure and the port information of the switching power supply module.
In the specific implementation process, discrete components on the switching power supply are packaged in a modularized mode by the switching power supply module, so that a module power supply with smaller volume and higher power density is formed. In this embodiment, a DC/DC switching power supply module is taken as an example for description. The circuit topology structure refers to a circuit structure inside the switching power supply module, and can be determined by looking up a technical manual, and the DC/DC switching power supply module comprises various topology types, such as Buck, boost, flyback, forward and the like. The circuit structure, the working principle and the design process of the switching power supply module are different, so that the circuit topology structure of the switching power supply module is firstly determined in the modeling process, and the circuit topology structure can also be called as a topology type. The port information refers to macro port information of the switching power supply module, such as input voltage, output current, switching frequency, output voltage ripple, and the like. Specifically, the switching frequency and the output voltage ripple can obtain the port information in an experimental test mode.
And S40, obtaining internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topological structure and the port information.
In the specific implementation, the internal circuit parameters include input and output currents and voltages, capacitance, inductance, frequency, etc. The parasitic parameters include parasitic capacitance, parasitic inductance, parasitic resistance, and the like. The internal circuit parameters and parasitic parameters can be obtained by calculation according to the circuit topology and port information.
Specifically, referring to fig. 3, the step of obtaining the internal circuit parameter and the parasitic parameter of the switching power supply module according to the circuit topology and the port information includes:
s402, determining the topology type of the circuit topology structure;
in a specific implementation process, the DC/DC switching power supply module includes multiple topology types, such as Buck, boost, flyback, forward, and the like, and the circuit structure, the operating principle, and the design process of the DC/DC switching power supply module are different. Therefore, we first specify the topology type of the switching power supply in the modeling process.
S404, based on the design rule and the constraint condition of the component parameters in the topology type, obtaining the internal circuit parameters and the parasitic parameters of the switching power supply module by using the port information.
In the specific implementation process, after the topology type is determined, the design rule and the constraint condition of the component parameters are determined, and at the moment, the parameters and the parasitic parameters of each part in the DC/DC switching power supply module can be calculated by using the key information such as the switching frequency, the output ripple voltage, the output voltage and the like acquired in the previous step.
S60, establishing an electromagnetic interference simulation model of the switch power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters;
in the specific implementation process, the Electromagnetic Interference simulation model refers to a conducted EMI (Electromagnetic Interference) simulation model.
In an optional embodiment, the step of establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topology, the internal circuit parameters and the parasitic parameters includes:
calling simulation software, and connecting components in the simulation software according to the circuit topology structure, thereby establishing an electromagnetic interference simulation model of the switching power supply module
Specifically, the calculation results (i.e., the circuit topology, the internal circuit parameters, and the parasitic parameters) are used to perform component selection and parameter setting in simulation software, and the components are connected according to the interconnection relationship in the circuit topology, so as to establish a DC/DC switching power supply module conducted EMI simulation model.
In this embodiment, taking the DC/DC switching power supply module as an example, a main circuit portion of the DC/DC switching power supply module is composed of a transformer winding, a power switch tube, a diode, and a plurality of passive devices such as a resistor and a capacitor. The main function is to carry out the on-off action of the power switch tube under the control signal to realize the transformation of the power supply form and output the voltage and the current meeting the requirements. And calculating parameters and parasitic parameters of each device in the main circuit through the acquired information, and further building a main circuit part simulation model in simulation software.
S80, performing electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model;
in a specific implementation process, a simulation result can be obtained based on the electromagnetic interference simulation model. And summarizing the conducted interference characteristics of the simulation result and the experimental result through comparative analysis of the simulation result and the experimental result. And the influence of the key parasitic parameters on the conducted interference signals is explored on the basis of an electromagnetic interference simulation model.
Specifically, the simulation result is obtained through calculation of simulation software, and the experimental result is obtained through field test. The interference characteristic is obtained by researching the relation between the interference characteristic and the change of the conducted interference condition when various parameters such as frequency, cable parameters, power and the like are changed through simulation and test. The influence of the key parasitic parameters on the interference signals can be set and changed by the relevant parasitic parameters in the simulation, and the change condition of the conducted interference result can be simulated and calculated.
The above is an explanation of the steps executed by the electromagnetic interference analysis method of the switching power supply module, and the execution process is shown more intuitively with an example.
And conducting EMI modeling simulation analysis is carried out by taking a certain type of DC/DC switching power supply module as an example. According to the above process, it can be known by referring to the technical manual that the topology of the DC/DC switching power supply module is flyback, the input voltage is 28V, the output voltage is 15V, and the output current is 1A. Experimental tests conducted according to the method of the above embodiment confirmed that the switching frequency was 410kHz and the output voltage ripple was 25.4mV.
The main circuit part of the DC/DC switching power supply module consists of a transformer winding, a power switch tube, a diode, a plurality of resistors, capacitors and other passive devices. The main function is to carry out the on-off action of the power switch tube under the control signal to realize the transformation of the power supply form and output the voltage and the current meeting the requirements. And calculating parameters and parasitic parameters of each device in the main circuit through the acquired information, and further building a main circuit part simulation model in simulation software. Referring to fig. 4, fig. 4 is a simulation model of a main circuit part of a flyback DC/DC switching power supply module. The transformer leakage inductance and switching tube type power supply comprises devices such as an input excitation device, an RCD absorption loop, a transformer leakage inductance and a switching tube, and also comprises a parasitic capacitance between the switching tube and a radiator.
The simulation model established in this example stably outputs 15outV after a start-up period of about 3ms, and the output current is stable after the start-up period, similar to the output voltage. Compared with a known simulation model, the input excitation and conversion functions can be realized.
The result shows that the error of the output voltage ripple of the DC/DC switching power supply module in the actual working state is 11.95 per mill of the output voltage ripple of the simulation model established by the implementation method, and the error is approximately consistent with the error.
The time domain conducted interference signal extracted by the LISN (line impedance stabilization network) is then subjected to fourier transform for observation analysis from a frequency domain perspective. In the experimental process, the sampling interval of the EMI receiver is 400Hz within the frequency band of 10 kHz-250 kHz, and is 4kHz within the frequency band of 250 kHz-10 MHz. In order to keep consistent with experimental tests, the same sampling interval is adopted when Fourier transform of the simulation result of the time domain conducted interference signal is carried out. From the EMC perspective, the frequency band, peak point frequency, amplitude and variation trend of the electromagnetic interference of the switching power supply are mainly analyzed. Comparing the conducted EMI simulation and experimental test results of the DC/DC switching power supply module can obtain that:
1) The frequencies of conducted interference peak points in the simulation result and the experimental test result correspond to each other and are respectively 410kHz, 820kHz, 1.23MHz, 1.64MHz and the like;
2) The peak value of the conducted interference signals fluctuates within the range of 90 dBuV-100 dBuV, the difference between the simulation test result and the experimental test result is about 5dBuV, and the error is within 5%;
3) In a high-frequency band, conducted interference signals in simulation results and experimental test results tend to rise first and then keep relatively stable along with the increase of frequency.
Referring to fig. 5, fig. 5 is a schematic diagram of experimental tests in this example. The experimental test is performed by taking a switching power supply as an example, and the test principle belongs to the prior art, and is not explained herein. Wherein, the EUT (Equipment Under Test) refers to the device Under Test.
Through the comparison and analysis of the simulation and experiment test results of the output voltage/current, the output voltage ripple and the conducted interference signal of the DC/DC switching power supply module, the accuracy of the modeling and the simulation analysis of the conducted EMI of the DC/DC switching power supply module is verified.
It should be understood that the above is only an example, and the technical solution of the present application is not limited in any way, and those skilled in the art can set the solution based on the needs in practical application, and the solution is not limited herein.
As can be easily found from the above description, the present embodiment provides an electromagnetic interference analysis method for a switching power supply module, where the method obtains the circuit topology and port information of the switching power supply module; obtaining internal circuit parameters and parasitic parameters of the switch power supply module according to the circuit topological structure and the port information; establishing an electromagnetic interference simulation model of the switch power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters; and performing electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model. That is, the method calculates the parameters of each internal device through the topological structure and the macroscopic port information of the switch power supply module, and then builds a simulation model with the same electrical performance as the actual power supply. The modeling simulation research of the switching power supply can be realized without directly obtaining detailed information such as a schematic diagram of an internal circuit of the switching power supply module and parameters of each device.
Referring to fig. 6, on the basis of the foregoing embodiment, an embodiment of the present application further provides an electromagnetic interference analysis method for a switching power supply board, where the method includes:
s102, obtaining electromagnetic interference simulation models of a plurality of switching power supply modules according to the electromagnetic interference analysis method of the switching power supply module in the embodiment;
in the specific implementation process, the switching power supply board is composed of a plurality of switching power supply modules, so that to perform electromagnetic interference research on the switching power supply modules, a simulation model library needs to be established first, and based on the simulation model library, electromagnetic interference simulation models of a plurality of different switching power supply modules need to be obtained first.
S104, establishing a symbol file and a model file of the switching power supply module according to the electromagnetic interference simulation model of each switching power supply module;
in the implementation, the symbol file refers to a model data structure (e.g., CAD) used for simulation, and the symbol file is some parameter setting files (similar to navigation parameters, which facilitate mapping with the model file) after the model file is deconstructed.
Specifically, the symbol file and the model file are established to subsequently establish a simulation model library including a plurality of basic unit models.
S106, establishing a simulation model library comprising a plurality of basic unit models based on the symbol files and the model files;
in the specific implementation process, based on the behavioral modeling idea of the IBIS model, the symbol file and the model file of the conducted EMI simulation model of the switching power supply module are respectively established on the basis of the conducted EMI simulation model of the switching power supply module, only the input and output ports are reserved, and the basic unit model is packaged in simulation software to establish a DC/DC switching power supply module simulation model library. The simulation model library comprises various basic unit models (such as fixed resistors, inductors, capacitors, linear impedance devices and the like), functional unit models (such as a change-over switch, a filter, an amplifier, a time domain power supply, a frequency domain power supply and the like) and the like, so that a user can build a complete switch circuit.
The IBIS (Input/Output Buffer Information Specification) model is a method for quickly and accurately modeling an I/O BUFFER based on a V/I curve, is an international standard reflecting chip driving and receiving electrical characteristics, provides a standard file format for recording parameters such as driving source Output impedance, rising/falling time, input load and the like, and is very suitable for calculating and simulating high-frequency effects such as oscillation, crosstalk and the like. The basic cell model refers to some basic models having basic functions for the switching circuit, such as an inductance model, a capacitance model, a power supply model, and the like.
S108, establishing an electromagnetic interference simulation model of the switching power panel based on the basic unit model in the simulation model library;
in a specific implementation process, the electromagnetic interference simulation model refers to a radiation EMI simulation model of the switching power supply board.
As an optional implementation manner, the step of establishing an electromagnetic interference simulation model of the switching power panel based on the basic unit model in the simulation model library includes:
calling the basic unit models in the simulation model library to realize the conducted electromagnetic interference modeling simulation of the switching power supply boards with different combination types;
in the specific implementation process, simulation and experimental results can be compared, and characteristics such as the frequency of a peak point of a conducted interference signal of the switching power panel, a peak value, a variation trend and the like can be analyzed and summarized.
And extracting interference signals in the conducted electromagnetic interference modeling simulation and parasitic parameters of the switching power supply board so as to establish an electromagnetic interference simulation model of the switching power supply board.
In the specific implementation process, an interference signal in conducted EMI simulation can be extracted in a field-path combined mode to serve as an excitation source, meanwhile, PCB parasitic parameters are extracted through Q3D and loaded into a model, and therefore a switching power panel radiation EMI simulation model is built.
The field-path combination method is that the calculation of the electromagnetic field is divided into two types, wherein the low frequency mainly takes circuit analysis, and the high frequency mainly takes electric field analysis, and the two methods are used together.
Q3D: in ANSYS simulation analysis software, Q3D is parameter extraction simulation software to generate an RLCG matrix or S parameters.
And S110, performing electromagnetic interference analysis on the switching power panel based on the electromagnetic interference simulation model of the switching power panel.
In the specific implementation process, far/near field radiated interference and resonance simulation are respectively carried out on the three-dimensional structure. And predicting and analyzing the radiation area, the radiation magnitude, the resonant frequency and the resonant mode on the board, and summarizing the radiation interference characteristics of the switching power supply.
It should be understood that the above is only an example, and the technical solution of the present application is not limited in any way, and those skilled in the art can make the setting based on the actual application, and the setting is not limited herein.
As can be easily found from the above description, the present embodiment provides an electromagnetic interference analysis method for a switching power supply board, which obtains electromagnetic interference simulation models of a plurality of switching power supply modules based on the electromagnetic interference analysis method for the switching power supply modules of the above embodiment; establishing a symbol file and a model file of each switching power supply module according to the electromagnetic interference simulation model of each switching power supply module; establishing a simulation model library comprising a plurality of basic unit models based on the symbol files and the model files; establishing an electromagnetic interference simulation model of the switching power panel based on the basic unit model in the simulation model library; and performing electromagnetic interference analysis on the switching power panel based on the electromagnetic interference simulation model of the switching power panel. Therefore, the method of the embodiment still calculates the parameters of each internal device through the topological structure and the macroscopic port information of the switch power supply module, and then builds a simulation model with the same electrical performance as the actual power supply. The modeling simulation research of the switching power supply can be realized without directly obtaining detailed information such as a schematic diagram of an internal circuit of a switching power supply module of the switching power supply board, parameters of each device and the like.
Referring to fig. 7, based on the same inventive concept, an embodiment of the present application further provides an electromagnetic interference analysis apparatus for a switching power supply module, including:
the information acquisition module is used for acquiring the circuit topological structure and the port information of the switching power supply module;
the parameter obtaining module is used for obtaining internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topological structure and the port information;
the simulation modeling module is used for establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters;
and the first analysis module is used for carrying out electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model.
It should be noted that, in this embodiment, each module in the electromagnetic interference analysis apparatus of the switching power supply module corresponds to each step in the electromagnetic interference analysis method of the switching power supply module in the foregoing embodiment one to one, and therefore, the specific implementation and achieved technical effect of this embodiment may refer to the implementation of the electromagnetic interference analysis method of the switching power supply module, which is not described herein again.
Referring to fig. 8, based on the same inventive concept, an embodiment of the present application further provides an electromagnetic interference analysis apparatus for a switching power supply board, including:
the first modeling module is used for obtaining electromagnetic interference simulation models of the plurality of switching power supply modules according to the electromagnetic interference analysis method;
the file establishing module is used for establishing a symbol file and a model file of the switching power supply module according to the electromagnetic interference simulation model of each switching power supply module;
the simulation library building module is used for building a simulation model library comprising a plurality of basic unit models based on the symbol file and the model file;
the second modeling module is used for establishing an electromagnetic interference simulation model of the switching power panel based on the basic unit model in the simulation model library;
and the second analysis module is used for carrying out electromagnetic interference analysis on the switching power panel based on the electromagnetic interference simulation model of the switching power panel.
It should be noted that, in this embodiment, each module in the electromagnetic interference analysis apparatus of the switching power supply template corresponds to each step in the electromagnetic interference analysis method of the switching power supply board in the foregoing embodiment one by one, and therefore, the specific implementation and achieved technical effect of this embodiment may refer to the implementation of the electromagnetic interference analysis method of the switching power supply board, which is not described herein again.
Furthermore, in an embodiment, the present application also provides a computer device comprising a processor, a memory and a computer program stored in the memory, which when executed by the processor implements the steps of the method in the preceding embodiment.
Furthermore, in an embodiment, the present application further provides a computer storage medium, on which a computer program is stored, and the computer program is executed by a processor to implement the steps of the method in the foregoing embodiments.
In some embodiments, the computer-readable storage medium may be memory such as FRAM, ROM, PROM, EPROM, EEPROM, flash, magnetic surface memory, optical disk, or CD-ROM; or may be various devices including one or any combination of the above memories. The computer may be a variety of computing devices including intelligent terminals and servers.
In some embodiments, executable instructions may be written in any form of programming language (including compiled or interpreted languages), in the form of programs, software modules, scripts or code, and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine, or other unit suitable for use in a computing environment.
By way of example, executable instructions may correspond, but do not necessarily have to correspond, to files in a file system, and may be stored in a portion of a file that holds other programs or data, such as in one or more scripts in a hypertext Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files that store one or more modules, sub-programs, or portions of code).
As an example, executable instructions may be deployed to be executed on one computing device or on multiple computing devices located at one site or distributed across multiple sites and interconnected by a communication network.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of other like elements in a process, method, article, or system comprising the element.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (e.g., a rom/ram, a magnetic disk, an optical disk) and includes instructions for enabling a multimedia terminal (e.g., a mobile phone, a computer, a television receiver, or a network device) to execute the method according to the embodiments of the present application.
The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all the equivalent structures or equivalent processes that can be directly or indirectly applied to other related technical fields by using the contents of the specification and the drawings of the present application are also included in the scope of the present application.
Claims (10)
1. An electromagnetic interference analysis method of a switching power supply module is characterized by comprising the following steps:
acquiring a circuit topological structure and port information of a switching power supply module;
obtaining internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topological structure and the port information;
establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters;
and performing electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model.
2. The method of claim 1, wherein the step of obtaining internal circuit parameters and parasitic parameters of the switching power supply module based on the circuit topology and the port information comprises:
determining a topology type of the circuit topology;
and based on the design rule and the constraint condition of the component parameters in the topology type, obtaining the internal circuit parameters and the parasitic parameters of the switching power supply module by using the port information.
3. The method of claim 2, wherein the port information comprises an input voltage, an output current, a switching frequency, and an output voltage ripple.
4. The method of claim 1, wherein the step of building an electromagnetic interference simulation model of the switching power supply module based on the circuit topology, the internal circuit parameters, and the parasitic parameters comprises:
and calling simulation software, and connecting components in the simulation software according to the circuit topological structure, so as to establish an electromagnetic interference simulation model of the switching power supply module.
5. A method for analyzing electromagnetic interference of a switching power panel is characterized by comprising the following steps:
the electromagnetic interference analysis method according to any one of claims 1-4, obtaining electromagnetic interference simulation models of a plurality of switching power supply modules;
establishing a symbol file and a model file of each switching power supply module according to the electromagnetic interference simulation model of each switching power supply module;
establishing a simulation model library comprising a plurality of basic unit models based on the symbol files and the model files;
establishing an electromagnetic interference simulation model of the switching power panel based on the basic unit model in the simulation model library;
and performing electromagnetic interference analysis on the switching power panel based on the electromagnetic interference simulation model of the switching power panel.
6. The method of claim 5, wherein the step of building an electromagnetic interference simulation model of a switching power panel based on the basic cell models in the simulation model library comprises:
calling the basic unit models in the simulation model library to realize the conducted electromagnetic interference modeling simulation of the switching power supply boards with different combination types;
and extracting interference signals in the conducted electromagnetic interference modeling simulation and parasitic parameters of the switching power supply board so as to establish an electromagnetic interference simulation model of the switching power supply board.
7. An electromagnetic interference analysis device of a switching power supply module, comprising:
the information acquisition module is used for acquiring the circuit topology structure and the port information of the switching power supply module;
the parameter obtaining module is used for obtaining internal circuit parameters and parasitic parameters of the switching power supply module according to the circuit topological structure and the port information;
the simulation modeling module is used for establishing an electromagnetic interference simulation model of the switching power supply module according to the circuit topological structure, the internal circuit parameters and the parasitic parameters;
and the first analysis module is used for carrying out electromagnetic interference analysis on the switching power supply module based on the electromagnetic interference simulation model.
8. An electromagnetic interference analysis device of a switching power supply board is characterized by comprising:
a first modeling module, configured to obtain electromagnetic interference simulation models of a plurality of switching power supply modules according to the electromagnetic interference analysis method according to any one of claims 1 to 4;
the file establishing module is used for establishing a symbol file and a model file of the switching power supply module according to the electromagnetic interference simulation model of each switching power supply module;
the simulation library building module is used for building a simulation model library comprising a plurality of basic unit models based on the symbol file and the model file;
the second modeling module is used for establishing an electromagnetic interference simulation model of the switching power panel based on the basic unit model in the simulation model library;
and the second analysis module is used for carrying out electromagnetic interference analysis on the switching power panel based on the electromagnetic interference simulation model of the switching power panel.
9. A computer device, characterized in that it comprises a memory in which a computer program is stored and a processor which executes said computer program implementing the method according to any one of claims 1-6.
10. A computer-readable storage medium, having a computer program stored thereon, which, when executed by a processor, performs the method of any one of claims 1-6.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116306445A (en) * | 2023-05-11 | 2023-06-23 | 深圳市锦锐科技股份有限公司 | Anti-electromagnetic interference method of key circuit for intelligent door lock |
| CN117391019A (en) * | 2023-10-18 | 2024-01-12 | 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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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116306445A (en) * | 2023-05-11 | 2023-06-23 | 深圳市锦锐科技股份有限公司 | Anti-electromagnetic interference method of key circuit for intelligent door lock |
| CN116306445B (en) * | 2023-05-11 | 2023-07-28 | 深圳市锦锐科技股份有限公司 | Anti-electromagnetic interference method of key circuit for intelligent door lock |
| CN117391019A (en) * | 2023-10-18 | 2024-01-12 | 广州市德珑电子器件有限公司 | Simulation test method, device, equipment and medium for EMI power filter |
| 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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