Transient Calorimetric Measurement of Ferrite Core Losses

Abstract

An accurate and fast transient calorimetric ferrite core-loss measurement method is proposed in this paper. In contrast to electrical measurements, the accuracy of the calorimetric approach is independent of the magnetic excitation and operating frequency. However, an accurate value of the thermal capacitance of the Core Under Test (CUT) is required, which can be achieved, e.g., by measuring the specific heat capacity of the measured core material using a Differential Scanning Calorimeter (DSC) or by using the CUT as a DC electric conductor and measuring its thermal response for known Joule heating. The proposed method is tested experimentally and compared successfully to a state-of-the-art electrical loss measurement method on MnZn ferrite cores.

An accurate and fast transient calorimetric ferrite core-loss measurement method is proposed in this paper. In contrast to electrical measurements, the accuracy of the calorimetric approach is independent of the magnetic excitation and operating frequency. However, an accurate value of the thermal capacitance of the Core Under Test (CUT) is required, which can be achieved, e.g., by measuring the specific heat capacity of the measured core material using a Differential Scanning Calorimeter (DSC) or by using the CUT as a DC electric conductor and measuring its thermal response for known Joule heating. The proposed method is tested experimentally and compared successfully to a state-of-the-art electrical loss measurement method on MnZn ferrite cores. © 2020 IEEE.