TK Electrical engineering. Electronics Nuclear engineering 235 TJ Mechanical engineering and machinery 12 TA Engineering (General). Civil engineering (General) 10 Efficiency 6 Electric inverters 5 Power converters 5 Controllers 4 Timing circuits 4 Voltage 4 Computer circuits 3 DC-DC converters 3 Electric inductors 3 Electric power transmission networks 3 Electric rectifiers 3 Electrophoretic deposition 3 High electron mobility transistors 3 III-V semiconductors 3 Inverters 3 Logic gates 3 MOS-FET 3 MOSFET 3 MOSFET devices 3 MOSFETs 3 Multilevel inverter 3 Optimization 3 Power quality 3 Rectifying circuits 3 Switches 3 T Technology (General) 3 Topology 3