Abstract
In this study two methods are proposed to increase the permeability of ferrite cores used in switch-mode power supply applications. The first method is based on the principle of magnetic shaking where an AC magnetic field is superposed on the magnetic core. This method yields good performance in shielding applications but still facing some technical difficulties in switch-mode power supply applications. The second method is based on superimposing a DC magnetic field component equivalent to the main DC component flowing in the main winding of the switch-mode power supply. This method is verified to reduce the power supply inductor current ripple by 68% while downsizing the core of the winding.
Highlights
The principle of magnetic shaking has long been applied in the field of magnetic shielding (Cohen, 1967; Tashiro and Sasada, 2005)
Excitation currents are obtained from two Power Amplifiers (PA)
The results show that the inductance of the coil is not improved since the ripples in the current is increased from 0.75A in the case of no shaking field is used to 0.9A in the case of shaking field is used
Summary
The principle of magnetic shaking has long been applied in the field of magnetic shielding (Cohen, 1967; Tashiro and Sasada, 2005). In Cohen (1967), it was proven experimentally that the magnetic shaking process could improve the material permeability, as a consequence magnetic shielding effect, below and above the applied shaking field frequency. It was shown that this results in five-fold increase in permeability (Kelha et al, 1980) This enhancement in permeability due to shaking can be justified due to keeping the domains in motion. The effect of superposing a DC magnetic field in the core is studied in order to investigate its effect on the performance of the coil in DC/DC power supply applications. Both techniques that may be efficient in reducing core size in power electronics applications are reported
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