Digital GaN 300W AC/DC Power Supply

Inhalt:
This work demonstrates the impact of GaN HEMTs combined with an appropriate digital control strategy in laptop charger application. A first power stage which is based on a bridgeless PFC totem-pole architecture, is in series with a DC -DC stage, i.e., an LLC resonant converter, to achieve a full operating charger. A 300 Watt AC-DC prototype is proposed and carefully designed including a high frequency range (up to 1 MHz) for the LLC stage in order to use the advantages of GaN technology.