High-frequency transformer winding loss semi-empirical calculation method considering end effect

Abstract

The invention discloses a high-frequency transformer winding loss semi-empirical calculation method considering an end effect. The method comprises the steps of screening a decisive influence factor of an alternating-current resistance coefficient according to a geometric structure of a transformer; combining the decisive influence factors of the alternating current resistance coefficients, carrying out dimensionless processing, and determining a reasonable change interval of each dimensionless parameter; establishing a parameterized finite element simulation model of the high-frequency transformer, and calculating alternating-current resistance coefficients under the condition of different dimension parameter combinations; and selecting a fitting function, performing multivariable regression analysis, and calculating a correction coefficient to obtain a semi-empirical formula. The method is suitable for winding loss calculation of narrow foils and circular conductors under different filling rates and arrangement modes, the calculation amount and the calculation time required by optimization design are reduced, convenience and rapidness are achieved, and engineering application isfacilitated.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to a semi-empirical calculation method for winding losses of high-frequency transformers considering end effects. Background technique [0002] There are two types of eddy current effect: skin and proximity effect. These two types of eddy current effects will cause non-uniform distribution of current density in the conductor under high-frequency conditions, increase the high-frequency AC impedance of the conductor, and thus limit the ability of the conductor to conduct high-frequency current. ability. Foil type, flat copper wire or Litz wire winding is usually used to reduce the thickness or diameter of the conductor while ensuring the current carrying capacity of the wire, and reduce the winding loss at high frequencies. [0003] The existing high-frequency winding loss calculation methods can be mainly classified into two categories: finite element method and ana...

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Problems solved by technology

In 2005, Robert used the results of 400 two-dimensional finite element simulations to propose an analytical calculation method for winding loss considering end effects, but this method is only applicable to single-layer foils of switch mode power supply (SMPS) transformers. Winding Loss Calculation

In 2008, Dimitrakakis used statistical methods to propose a semi-empirical calculation method for high-frequency winding losses, but this method is only applicable to non-layered coil windings

In 2009, Dimitrakakis discussed in detail the influence of the end effect on the winding loss of narrow foils and circular conductors, but did not give an effective calculation method for winding loss

In 2014, Bahmani used the two-dimensional finite element simulation results to give an analytical calculation method of winding loss considering the end effect. This method is suitable for large-capacity high-frequency transformers, but the formula structure is relatively complicated and the physical meaning is not clear.

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