Core Loss Estimation of Magnetic Links in DAB Converter Operated in High-Frequency Non-Sinusoidal Flux Waveforms

Abstract

The dual active bridge (DAB) is apt bidirectional power converter for high power density applications. The power can be transferred via magnetic link stage and the waveform of flux distribution gets affected due to modulation control of DAB. Traditionally, the improved - Steinmetz equation is utilized to evaluate the core loss. However, this loss determination in the magnetic link is inaccurate due to modulation control of DAB converter. Moreover, in DAB converter, fixed core losses are taken into account for power transmission. In order to avoid these limitations, this paper presents accurate core loss estimation of magnetic links operated in non-sinusoidal excitation. Moreover, analyzed and presented design specifications, operation, test platform and experimental results. Finally, the measured output power of DAB converter has been compared with suitable analytic method, which concludes the proposed approach has minimum error margins.