Design of 500 kHz, 18 kW Low Leakage Inductance Intraleaved Litz Wire Transformer for Bi-directional Resonant DC-DC Converter
In: 2021 IEEE Applied Power Electronics Conference and Exposition (APEC), 2021-06-14
Online
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Zugriff:
This paper focuses on the design of a 18 kW, 500 kHz, 8:4 planar E core litz wire transformer for a bi-directional CLLC resonant dc-dc converter. In order to reduce gain variance around the resonant frequency, the transformer design focuses on minimizing leakage inductance. Multiple winding topologies are surveyed and the selected P-S1-P-S2 winding topology achieves primary leakage inductance of 747 nH and secondary leakage inductance of 120 nH. In order to improve current sharing among two parallel windings, an "intra-leaved" winding structure is proposed which achieves a current distribution of 42 APeak for S1 and 38 APeak for S2 while maintaining the low leakage inductance benefits of the P-S1-P-S2 structure. The transformer winding is potted in thermal epoxy to improve winding heat spreading and peak winding temperature is 126°C at 18 kW load. An easy-to-use ac core loss measurement technique is demonstrated which minimizes measurement error due to transformer ac resistance. The designed transformer achieves 99.6% efficiency at 18 kW load and a power density of 1720 W/in3.
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Design of 500 kHz, 18 kW Low Leakage Inductance Intraleaved Litz Wire Transformer for Bi-directional Resonant DC-DC Converter
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Autor/in / Beteiligte Person: | Dong, Dong ; Cao, Yuliang ; Ngo, Minh ; Burgos, Rolando |
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Zeitschrift: | 2021 IEEE Applied Power Electronics Conference and Exposition (APEC), 2021-06-14 |
Veröffentlichung: | IEEE, 2021 |
Medientyp: | unknown |
DOI: | 10.1109/apec42165.2021.9487443 |
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