@inproceedings{chattopadhyay_gohil_acharya_nair_bhattacharya_2018, title={Efficiency improvement of three port high frequency transformer isolated triple active bridge converter}, volume={2018-March}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85046944973&partnerID=MN8TOARS}, DOI={10.1109/apec.2018.8341262}, abstractNote={This paper discusses and compares few techniques for efficiency improvement of Three-port Triple Active Bridge(TAB) Converter. Transformer isolated three port phase shifted Triple Active Bridge dc-dc converters are very efficient in nature providing high efficiency, ZVS operation over wide range, galvanic isolation and bidirectional power flow capability. The natural turn-on ZVS for switching devices in DAB or TAB converters is a very useful property for using Mosfets, as it reduces the device losses by a huge margin. The natural ZVS is lost for phase shifted converters at low power operating regions, causing reduction in efficiency. This paper discusses a comparsion between phase shift operation at fixed frequency vs phase shift operation at varying frequency and varying duty cycle operation at fixed frequency, which leads to a greater operating range of natural turn-on ZVS thus improving the efficiency. A comparison of the three methods have been presented in this paper with experimental results from a 10kW hardware prototype made of SiC Mosfets.}, booktitle={Thirty-third annual ieee applied power electronics conference and exposition (apec 2018)}, author={Chattopadhyay, R. and Gohil, G. and Acharya, Sayan and Nair, V. and Bhattacharya, S.}, year={2018}, pages={1807–1814} }
 @inproceedings{chattopadhyay_raheja_gohil_nair_bhattacharya_2018, title={Sensorless phase shift control for phase shifted DC-DC converters for eliminating DC transients from transformer winding currents}, volume={2018-March}, url={http://www.scopus.com/inward/record.url?eid=2-s2.0-85046958041&partnerID=MN8TOARS}, DOI={10.1109/apec.2018.8341274}, abstractNote={The paper presents a two phase shift control strategy for Dual Active Bridge(DAB) and Triple Active Bridge(TAB) converter to eliminate the dc transients from the high frequency transformer winding currents during operating phase angle change from one cycle to the next cycle. The proposed two phase shift method controls the alternating nature of high frequency current in transformer windings in one switching cycle without using any high frequency current sensor. The proposed control strategy applies two different phase shift angles during positive and negative half cycles in order to eliminate the dc transients from transformer winding currents during steady state phase angle change. The control strategy is analyzed and applied for power flow direction reversal of Dual Active Bridge Converter and for changing power flow mode from three port scenario to two port scenario in case of Triple Active Bridge converter. The proposed control strategy study has been verified by performing experimental study on a hardware prototype.}, booktitle={Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC}, author={Chattopadhyay, R. and Raheja, U. and Gohil, G. and Nair, V. and Bhattacharya, Subhashish}, year={2018}, pages={1882–1889} }