| Abstract |
In this paper a 2kW 400 V/36V LLC converter with an inverse coupled planar current doubler rectifierwith minimized stray inductance is presented and assessed in conjunction with state of the art 100Vsilicon and gallium nitride power semiconductors. First, the general impact of the current doubler onZVS behaviour and turn-off overvoltage without a snubber circuit is discussed. Afterwards, two lowinductance planar coupled inductor designs are presented and their impact on performance and efficiency is evaluated. The proposed LLC converter with a multi-stack planar coupled inductor is able to reach an efficiency of more than 98\% at a switching frequency of 290 kHz and can be operated without snubber circuit, when the right combination of coupled inductor and transistor is chosen. |
