Equivalent calculation method for parasitic capacitance of PCB winding of planar transformer
A technology of planar transformers and parasitic capacitances, which is applied in the establishment of EMI conduction models and in the field of efficiency calculations, and can solve problems such as inability to calculate distributed capacitances
Active Publication Date: 2017-10-20
SOUTHEAST UNIV
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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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[0076] The size of the parasitic capacitance in the planar transformer is equal to the superposition of countless capacitances, and it is impossible to express them one by one. The generation of capacitance is essentially due to the electric field generated between two conductors with different potential differences, and the existence of the electric field means energy. Therefore, capacitance actually characterizes the ability to store energy. In other words, the equivalent overall capacitance is actually equivalent to the energy storage capacity of a transformer as a whole. Therefore, the size of the equivalent capacitance can be calculated by calculating the energy. In the design analysis process of the switching power supply, an equivalent model is established to represent the parasitic capacitance between the PCB windings of the planar transformer. Such as figure 1 As shown, in the present invention, the parasitic capacitance between the planar transformer PCB windings ...
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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...
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Login to View More IPC IPC(8): G06F17/50
CPCG06F30/327G06F30/398H01F27/34H01F2027/2819H01F2027/2809
Inventor 钱钦松张乐刘琦孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV