Filter parameter calculating method and system, device and storage medium

Abstract

The invention discloses a filter parameter calculating method and system, a device and a storage medium. The method comprises the steps of: calculating the common mode capacitance value CCM accordingto a common mode insertion loss value IL<CM><*>, an over-standard cutoff frequency value f<*> and a common mode inductance value LCM; calculating the differential mode inductance value LDM according to a differential mode insertion loss value IL<DM><*>, the over-standard cutoff frequency value f<*> and a differential mode capacitance value CDM; and designing the parameter of a filter according tothe common mode capacitance value CCM and the differential mode inductance value LDM. According to the filter parameter calculating method and system, the device and the storage medium, the common mode capacitance value and the differential mode inductance value are obtained respectively through calculation, the parameter of the filter is designed according to the common mode capacitance value andthe differential mode inductance value, the effectiveness of the parameter of the filter is improved, and the condition that the filter fails due to impedance changes caused by nonlinear devices in asystem at work is avoided.

Description

technical field [0001] The present invention relates to the field of filters, in particular to a calculation method, system, device and storage medium for parameters of filters. Background technique [0002] With the continuous development of semiconductor materials, the switching frequency of power switching tubes used in power electronic systems is getting higher and higher. Although the efficiency of the system is improved to a certain extent, it also leads to a sharp increase in the conducted electromagnetic interference in the system, which cannot be ignored. It can be effectively suppressed by designing an electromagnetic interference filter. However, there is still no relatively complete theoretical basis for the design of passive electromagnetic interference filters. Generally, the design is based on a certain experience, and the nonlinear characteristics of the system impedance are basically ignored. Even if this is recognized, it is not very good. method to solve....

AI Technical Summary

Problems solved by technology

Although the efficiency of the system is improved to a certain extent, it also leads to a sharp increase in the conducted electromagnetic interference in the system, which cannot be ignored. It can be effectively suppressed by designing an electromagnetic interference filter

However, there is still no relatively complete theoretical basis for the design of passive electromagnetic interference filters. Generally, the design is based on a certain experience, and the nonlinear characteristics of the system impedance are basically ignored. Even if this is recognized, it is not very good. way to solve

The design of the conducted electromagnetic interference filter in the grid-connected inverter is based on the limit value of the corresponding standard and the actual measurement value of the system to obtain the proper insertion loss, and does not take into account the nonlinear impedance of the noise source on the passive filter. effect of tor insertion loss

[0003] The traditional electromagnetic interference filter is ideally designed based on the demand value of the insertion loss obtained by measurement and comparison. The filter fails due to the impedance change caused by the nonlinear device in the system during operation, and the electromagnetic The effectiveness of the parameters of the interference filter is low

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