Core Losses Measurement of 10MHz PWM Excitation Based on DC Power Method

Nowadays, it is difficult to accurately measure the core losses of magnetic components of power converter under high-frequency excitation. Based on the DC power method, this paper proposes the measuring system of core losses at l0MHz using a new wide bandgap semiconductor device GaN. The switching process of the DC/AC inverter circuit is analyzed in detail, and the loss model of the DC/AC inverter circuit is established. The measuring accuracy is verified with the air-core inductor, whose loss can be accurately measured, and the maximum relative error is 9.1%. Finally, the core losses of magnetic components under l0MHz excitation are measured based on the built measurement system.