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New method to characterize magnetic hysteresis in soft ferrites up to high frequencies

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4 Author(s)
Tellini, B. ; Dipt. di Sistemi Electtrici e Automazione, Univ. di Pisa, Italy ; Giannetti, R. ; Robles, Guillermo ; Lizon-Martinez, S.

Characterization of magnetic cores is an indispensable task in order to securely accomplish the requirements of a power electronic design and prevent failures. The hysteresis cycle of the material is one of the more complex features to characterize due to the well-known nonlinear and memory effects; moreover, there is a less known but noticeable dependence of the B-H relationship with time. This curve is easily obtained at low frequencies (up to 10 kHz) by means of a well-known traditional method. However, there is a major obstacle when trying to operate at higher frequencies in this manner due to the cost and difficulty of operation of high-frequency-high-voltage generators. In this paper, a new method for measuring hysteresis based on a quasi-sinusoidal generator that allows us to reach much higher values in frequency with a simple setup is presented.

Published in:

Instrumentation and Measurement, IEEE Transactions on  (Volume:55 ,  Issue: 1 )

Date of Publication:

Feb. 2006

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