Tiny Power Box - Exploiting Multiport Series Resonant Topologies for Very High Power Density Onboard Chargers

Inhalt:
Growing expectations of modern onboard chargers for bidirectional power, galvanic isolation and additional low voltage output(s) leads to ever-increasing part count and complexity. Nevertheless, this paper shows that very high power density can still be achieved with a multiport series resonant topology. Close to 4 kW/dm3 (excl. housing) is achieved for 7kW and 11kW applications with a charging efficiency >97% while meeting most safety and EMI standards resulting in up to 3.1 kW/dm3 (incl. housing) when liquid cooling is used. An overview of the proposed topology and optimization approach is given followed by a description of both prototypes with comparison to state of the art.