New method for error compensation in high frequency loss measurement of powder cores

Abstract

This paper presents a method for compensating phase shift error in high frequency loss measurement of powder magnetic cores. The common approach for measuring the loss in magnetic cores is B-H loop measurement where two windings are placed on the core under test. However, due to the low-permeability characteristic of powder core materials, phase shift error can cause noticeable error. Propagation delay in the voltage and current probes are the main sources of phase shift error in this measurement process. In this paper a compensation approach has been proposed for accurate loss measurement of these materials. In the proposed method, the voltage and current probe is time aligned with the compensated delay time to obtain the same loss that is expected from the datasheet. As a validation, experimental measurements have been performed using Kool Μμ 0077439A7. The results match very well with the analytical study.