A method and device for modeling and simulating electromagnetic interference
A technology of electromagnetic interference and interference source, applied in the direction of measuring device, measuring interference from external sources, measuring electricity, etc., can solve the problems of limited practical value of engineering and difficult to cover, and achieve the effect of good practical value of engineering
Active Publication Date: 2020-09-29
BEIJING JINGWEI HIRAIN TECH CO INC
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Problems solved by technology
Among them, the behavioral model is only effective at lower frequencies, and it is difficult to cover the frequency bands concerned by electromagnetic compatibility (above 100KHz)
Measurement-based modeling relies on measurements after product development is completed, and can be effectively used for rectification optimization and system integration, but has limited engineering practical value in the design phase
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[0067] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0068] Before introducing the embodiments of the present invention, first define several frequency ranges involved:
[0069] Low frequency: DC~100kHz;
[0070] High frequency: 100 kHz to several hundreds of MHz (frequency range concerned by electromagnetic compatibility).
[0071] see figure 1 , figure 1 An implementation flowchart of an electromagnetic interference modeling and simulation method provided by an embodiment of the pr...
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The invention discloses electromagnetic interference modeling and simulation method and device. The method comprises the following steps: establishing a low-frequency impedance model of a direct-current brush motor; based on the low-frequency impedance model, establishing a low-frequency equivalent circuit model for commutation of the direct-current brush motor, and obtaining the low-frequency characteristics of an interference source by use of the low-frequency equivalent circuit model; calculating the high-frequency characteristics of the interference source by use of the low-frequency characteristics of the interference source; establishing a full-wave model of the simplified structure of the direct-current brush motor; integrating the high-frequency characteristics of the interferencesource into the full-wave model to obtain an integrated model; performing numerical simulation calculation on the integrated model to obtain the electromagnetic interference of the direct-current brush motor. The method and the device disclosed by the invention realize modeling and simulation analysis of the direct-current brush motor in the design stage. Meanwhile, based on the modeling and electromagnetic compatibility principle, the interference source characteristics with high frequency of hundreds of MHz are worked out, thus the method and the device can cover a relatively wide frequencyrange of electromagnetic compatibility and have a relatively great engineering value.
Description
technical field [0001] The invention relates to the technical field of electromagnetic compatibility, in particular to a method and device for modeling and simulation of electromagnetic interference. Background technique [0002] Brushed DC motors are widely used in electrical and electronic systems. Due to the mechanical commutation, the power line of the DC brush motor will produce instantaneous current changes during commutation, causing electromagnetic interference. The electromagnetic interference propagates along the power line, which may affect the normal operation of other components in the electrical and electronic system through conduction coupling or radiation coupling, or cause the electromagnetic emission to fail to meet the requirements of international national electromagnetic compatibility standards. Therefore, analyzing the electromagnetic interference of brushed DC motors is a factor that needs to be considered in product design. [0003] The analysis and...
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IPC IPC(8): G01R31/00
CPCG01R31/001
Inventor 童心陈有锋
Owner BEIJING JINGWEI HIRAIN TECH CO INC