Equivalent calculation method for parasitic capacitance of PCB winding of planar transformer

Abstract

The invention discloses an equivalent calculation method for parasitic capacitance of a PCB winding of a planar transformer. Through modeling and analysis of the PCB winding of the planar transformer, a distribution condition of the parasitic capacitance of the PCB winding is simulated; by calculating parasitic capacitance stored energy between two adjacent layers of the parasitic capacitance and performing superposition, the parasitic capacitance of the whole PCB winding is calculated by utilizing a relationship between the energy and the parasitic capacitance, and an energy conservation law; and then the calculation of the parasitic capacitance of the PCB winding is equivalent to the calculation of capacitance of three parts, namely, capacitance C1 between the dotted terminal of a primary winding and the dotted terminal of a secondary winding, capacitance C2 between the dotted terminal of the primary winding and the non-dotted terminal of the secondary winding, and capacitance C3 between the non-dotted terminal of the primary winding and the dotted terminal of the secondary winding.

Description

technical field [0001] The invention relates to a PCB-type planar transformer, in particular to an equivalent calculation method for the parasitic capacitance of a planar transformer PCB winding, which can be applied to the analysis of the parasitic parameters of the planar transformer and the establishment of an EMI conduction model in the field of electromagnetic compatibility. Background technique [0002] The planar transformer has the advantages of low height, small size, good consistency, convenient mass production, small leakage inductance, good heat dissipation, and good electromagnetic compatibility. It is a new type of transformer that is widely used at present. There are many kinds of planar transformers, among which PCB planar transformers are the most widely used due to their advantages of low cost, stable structure, and convenient fabrication. Its structure is relatively simple, and the via holes of each layer of winding can be welded. The parasitic capacitanc...

AI Technical Summary

Problems solved by technology

Although the three winding forms have different structures, they will inevitably generate parasitic capacitance

Therefore, the distributed capacitance cannot be directly calculated by the method of calculating the electrostatic capacitance

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