A Novel Calorimetric Loss Measurement Method For High-Power High-Frequency Transformer Based on Surface Temperature Measurment

Accurate loss measurement methods are necessary for modeling losses of high-power high-frequency transformers precisely and further optimizing the efficiency. The electrical loss measurement methods have large error especially for high-efficiency and AC cases like transformers, while the calorimetric methods require complex setup. In this paper, a novel calorimetric loss measurement method based on surface temperature measurement is proposed, which eliminates the need of extra device and complex installation. The method is verified by FEM (Finite Element Method) simulation, having a maximum error of less than 0.1W. In addition, the influences of changes of environmental conditions including air velocity and ambient temperature are studied by FEM simulation as well.