Operational loss reduction using power-MOSFET for magnetic field coil power supplies of nuclear fusion experimental machine

To meet the requirement of supplying extremely high DC current to the magnetic field coil of nuclear fusion experimental machine, the AC/DC converter system of power supplies should be designed to reduce the operational loss. An attractive power electronics element of power-MOSFET has the advantage of low on state resistance, and is suitable as the switching device for low voltage and high current AC/DC converter. To make the on state resistance of power-MOSFET lower for loss reduction, the static and DC characteristics of on-state resistance are investigated in the conditions of pre-cooled down temperature and in parallel connection for power-MOSFET.