Contactless DC connector based on ISOP-IPOS topology for high power density 380 V DC power feeding system

Contactless DC connector has been proposed for high power density 380 V DC power feeding system. A LLC resonant DC-DC converter topology with GaN power transistors and Si-SBDs has been applied to realize high frequency and high efficiency inductively-coupled contactless DC connector. ISOP (input series and output parallel)-IPOS (input parallel and output series) connection topology has been also employed to develop 380 V DC connector. Prototype of a 1.2 kW 384 V-192 V DC connector to constitute a part of 384 V-384 V connector has been fabricated, and maximum efficiency of 96.5% with the ideal power density of 5.4 W/cm³ has been confirmed experimentally under 500 kHz operation. Design consideration for the proposed connector has been also conducted, and the approach for achieving higher power density of 10 W/cm³ has been presented.