Electromagnetic interference modeling and simulation method and device

Abstract

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 an electromagnetic interference modeling and simulation method and device. Background technique [0002] DC brushed motors are widely used in electronic and electrical systems. Due to the mechanical commutation, the power line of the brushed DC motor will produce instantaneous current changes when commutating, causing electromagnetic interference. The electromagnetic interference propagates along the power line, which may affect the normal operation of other components in the electronic and electrical system through conduction coupling or radiation coupling, or cause electromagnetic emission not to meet the requirements of international and national electromagnetic compatibility standards. Therefore, analyzing the electromagnetic interference of DC brushed motors is a factor that needs to be considered in product design. [0003] The analysis and design of...

AI Technical Summary

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

Images