How are the winding losses excluded from the power loss measurements?

[YannEBouvier]

First of all, congratulations on the work done. I look forward to using the tool in my future research.

In the section about the calculation of losses, it is stated that the estimation of losses comes from the average of the instantaneous voltage and current multiplication. This would include both winding and core losses.

Are you neglecting them? Are you designing them to be neglectable? does this work at all operation points?

It would be good to clarify.

Best regards.

[ds9056]

Thank you for the question. With the setup we are using only core loss is measured, as the voltage drop due to winding losses is not reflected in the secondary voltage. We will update the FAQ section to clarify why the measurement setup used does not include winding losses. To address your question, the core under test has two windings. A voltage is applied to the primary windings, and the current through this winging is measured. The voltage is not measured in the primary winging, as, as you noted, it would contain the voltage drop associated with the winding losses too; instead, the voltage is measured using a passive probe in the secondary winding. Due to the high impedance of the probe, the current in the secondary winding is negligible, so the secondary voltage is directly related to the flux density in the core. The average of the product of the primary current and the secondary voltage in a switching cycle is a measure of the core loss. For more details, the same measurement technique is also described in these two papers: • P. C. Sarker, M. R. Islam, Y. Guo, J. Zhu and H. Y. Lu, "State-of-the-Art Technologies for Development of High Frequency Transformers with Advanced Magnetic Materials," in IEEE Transactions on Applied Superconductivity, vol. 29, no. 2, pp. 1-11, March 2019. • Jieli Li, T. Abdallah and C. R. Sullivan, "Improved calculation of core loss with nonsinusoidal waveforms," Conference Record of the 2001 IEEE Industry Applications Conference. 36th IAS Annual Meeting (Cat. No.01CH37248), 2001, pp. 2203-2210 vol.4.