Magnetic core loss separation calculating method

Abstract

The invention discloses a magnetic core loss separation calculating method. The method includes the following steps: under the condition of the given magnetic flux density variable quantity, , forming a magnet loss construction separation equation set to separate magnetic hysteresis loss from vortex loss by using loss data of any two working points with different frequency under sinusoidal excitation, simulating corresponding relation of resistance rate of magnetic core materials and frequency of the magnetic core materials through a linear interpolation method, and gathering the additional vortex loss of the rest loss to a classical conduction vortex loss. The magnetic core loss separation calculating method has the advantages of being clear in physical concepts, simple in separation calculation process, capable of effectively separating loss components of the magnetic core without dependence on a special instrument, and being widely applied to simulation software to simulate size of loss of the magnetic core materials in power electronic application under different frequency and magnetic induction intensity.

Description

technical field [0001] The invention relates to a method for calculating magnetic core loss in a switching converter, in particular to a method for calculating hysteresis loss and eddy current loss of a high-frequency ferrite magnetic core. Background technique [0002] The pursuit of miniaturization makes people put forward more and more strict requirements on the volume and efficiency of switching converters. Increasing the switching frequency is one of the basic methods to reduce the volume of switching converters. The components such as transformers, filter inductors and energy storage capacitors Both volume and weight decrease with increasing frequency. Magnetic components are one of the most important devices in switching converters, and they have a decisive influence on the efficiency and volume of the whole machine. Therefore, it is necessary to estimate the approximate range of core loss caused by different topological structures in the early design stage of the pr...

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Problems solved by technology

There are two main deficiencies in the Steinmetz equation and its improved method: one is that it can only be applied to the magnetic loss estimation under certain excitation conditions, and it has no universal significance; the other is that it is necessary to test the corresponding coefficients for different materials, which gives Practical application in the engineering world brings difficulties

[0006] There are two main disadvantages in this method: one is that the relationship between the core material and the frequency is not an ideal linear relationship, and the core material has already lost its magnetism under high frequency conditions; the other is that the core is a nonlinear system. The accumulation after Fourier decomposition is to treat the nonlinear system as a linear system, which itself introduces errors

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