Abstract
Magnetic materials are widely used in switching-mode power supplies (SMPS) and magnetic components in SMPS usually work under two typical rectangular excitations (with or without the period of zero voltage). Extensive experimental results have shown that there is quite a difference of core loss between sinusoidal excitations and rectangular excitations, which means the traditional core loss calculation methods are no longer applicable. In this paper, two formulas for core loss calculation under the above rectangular excitations are derived based on the Improved Generalized Steinmetz Equation (IGSE). Core loss of different magnetic materials, under both sinusoidal excitations and rectangular excitations with different frequencies and duty cycles, are measured. Experimental results show that the formulas are accurate enough and very useful to predict the core loss.
Highlights
INTRODUCTIONMagnetic properties of the magnetic materials in switching-mode power supplies (SMPS)
Magnetic properties of the magnetic materials in switching-mode power supplies (SMPS)play essential role in core loss calculation and performance optimization
The core loss calculation methods are divided into three main categories in the literature:[6] hysteresis model method, core loss separation method and Steinmetz equation (SE) method
Summary
Magnetic properties of the magnetic materials in switching-mode power supplies (SMPS). The second method expresses core loss as the sum of three types: the eddy current loss, the hysteresis loss and the excess loss This method requires additional parameters well beyond what is typically available in manufacturers’. The core loss are represented by an empirical formula (1) in which the core loss depends only on the excitation frequency f and the maximum magnetic flux density Bm. where k, α and β are the frequency-dependent Steinmetz parameters, which are usually provided by the manufacturers or can be acquired by curve fitting. Where k, α and β are the frequency-dependent Steinmetz parameters, which are usually provided by the manufacturers or can be acquired by curve fitting This method is relatively practical and straightforward to core loss prediction. |cos θ|αdθ where ∆B is the peak-to-peak magnetic flux density value (i.e., 2Bm). k, α and β are the Steinmetz parameters as used in SE
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