New core loss measurement method with partial cancellation concept

As an essential part in a power converter, the magnetic cores and their design play an important role in achieving high efficiency and high power density. Accurate measurement of the core loss is important to their optimization. To improve the measurement accuracy, previous methods were proposed to cancel the reactive voltage of the testing core by a cancellation capacitor or inductor. However, the value of the cancellation component is critical, and a small variation may induce a big measurement error, so extra effort is required to fine-tune the cancellation component value. This paper presents a new measurement method with partial cancellation concept that enables accurate core loss measurement at high frequency without requirement to fine-tune the cancellation component value.