Power Electronics

Part 1 Devices: basic semiconductor physics and technology; processes forming pn junctions, the masking process, lifetime control, the pn junction; the pn junction under forward bias - (steady state), the pn junction under reverse bias - (steady state), thermal effects, piecewise-linear junction diode model, power switching devices and their static electrical characteristics; the power diode, power switching semiconductor transistors, the thyristor, the field-controlled thyristor - (fct), electrical ratings and characteristics of power semiconductor switching devices; general maximum ratings of power semiconductor devices, the fast-recovery diode, the bipolar, high-voltage, power switching npn transistor, the power mosfet, the thyristor, the insulated gate bipolar transistor, the field-controlled switch, cooling of power switching semiconductor devices; thermal resistances, modes of power dissipation, average power dissipation, power losses from manufacturers' data sheets, heat-sinking design cases. Part 2 Drivers: load consideration; the resistive load, the inductive load, driving the transistor, and its protection; application of the power mosfet, application of the bipolar transistor, soft voltage clamp analysis, snubbers for bridge legs, appendix - turn-off switching-aid circuit analysis, driving the thyristor, and its protection; gate drive circuits, gate drive design, drive design for gto's thyristor switching-aid circuits, switching-aid circuit for the gto thyristor, appendix - turn-off snubber circuit analysis, switching-aid circuits with energy recovery; energy recovery for turn-on snubber circuits, energy recovery for turn-off snubber circuits, unified turn-on and turn-off snubber circuit energy recovery, series and parallel device operation and protection; parallel and series operation of power devices, protection. Part 3 Applications: naturally commutating converters; single-phase uncontrolled converter circuits, single-phase half-controlled converter, single-phase controlled thyristor converter circuits, three-phase uncontrolled converter circuits, three-phase half-controlled converter, three-phase controlled thyristor converter circuits, overlap, AC voltage regulators; single-phase AC regulator, three-phase AC regulator, integral cycle control, single-phase transformer tap changer, cycloconverter, load efficiency and supply current power factor, thyristor forced commutated DC choppers; a thyristor reverse impressed voltage commutated DC chopper, a thyristor current impulse displacement commutated DC chopper, other cid and riv commutation circuits, comparison between the cid and riv commutation processes, static power inverters; voltage-fed inverter bridge topologies, controlled current-sourced inverters, switched mode power supplies; the forward converter, the flyback converter, comparison of basic converters, multiple-switch, balanced, isolated converters.