TY - GEN
T1 - Sparse Operation of Multi-Winding Transformer in Multiport-Ac-Coupled Converters
AU - Elasser, Youssef
AU - Chen, Yenan
AU - Wang, Ping
AU - Chen, Minjie
PY - 2019/6/1
Y1 - 2019/6/1
N2 - The multi-winding transformer in a Multiport-Ac-Coupled (MAC) converter interfaces with a large number of ac-dc ports and processes multi-way power flow. This paper investigates the "sparse operation" of multi-winding transformers, i.e. when only a few windings deliver power and a majority of the windings remain open-circuited. These open-circuited windings induce additional leakage inductance and skin proximity effects in planar magnetics, change the circuit behavior, and increase the losses. By modeling a ten-winding PCB-embeded planar transformer in SPICE, the impact of "sparse operation" on transformer performance is predicted. To verify the theoretical modeling and simulation results, the performance of a 10-winding planar PCB transformer is experimentally compared to the performance of a 10-winding litz wire transformer in a 10-port MAC converter while transferring power from one winding to another. In the planar transformer, it is observed that windings that are physically closer to each other can transfer more power at higher efficiencies than those that are further, while this trend is not present in the litz wire transformer.
AB - The multi-winding transformer in a Multiport-Ac-Coupled (MAC) converter interfaces with a large number of ac-dc ports and processes multi-way power flow. This paper investigates the "sparse operation" of multi-winding transformers, i.e. when only a few windings deliver power and a majority of the windings remain open-circuited. These open-circuited windings induce additional leakage inductance and skin proximity effects in planar magnetics, change the circuit behavior, and increase the losses. By modeling a ten-winding PCB-embeded planar transformer in SPICE, the impact of "sparse operation" on transformer performance is predicted. To verify the theoretical modeling and simulation results, the performance of a 10-winding planar PCB transformer is experimentally compared to the performance of a 10-winding litz wire transformer in a 10-port MAC converter while transferring power from one winding to another. In the planar transformer, it is observed that windings that are physically closer to each other can transfer more power at higher efficiencies than those that are further, while this trend is not present in the litz wire transformer.
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U2 - 10.1109/COMPEL.2019.8769650
DO - 10.1109/COMPEL.2019.8769650
M3 - Conference contribution
T3 - 2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019
BT - 2019 IEEE 20th Workshop on Control and Modeling for Power Electronics, COMPEL 2019
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 20th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2019
Y2 - 17 June 2019 through 20 June 2019
ER -