How to choose a good inverter power devices

Select essential elements of the inverter main power is currently using more power components Darlington power transistor (GTR), power FET (4000 watt power inverter), insulated gate transistor (IGBT) and a turn-off thyristor (GTO) and the like. Used in small volume, low pressure systems more devices to MOSFET, because the MOSFET has a low on-state voltage drop and higher switching frequencies; capacity in the high-pressure system in general IGBT modules are used, this is because as the voltage MOSFET 5000 watt inverter its on-state resistance also increased, while the IGBT has a large advantage in the capacity of the system; while large capacity (100KVA and above) systems, in general, are used GTO as power components.