CONTROLLABLE SWITCHES

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Presentation transcript:

CONTROLLABLE SWITCHES Overview 2011.10.06. Power Electronics MSc

Generic Switch Symbol Idealized switch symbol When on, current can flow only in the direction of the arrow Instantaneous switching from one state to the other Zero voltage drop in on-state Infinite voltage and current handling capabilities 2011.10.06. Power Electronics MSc

Switching Characteristics (linearized) Switching Power Loss is proportional to: switching frequency turn-on and turn-off times 2011.10.06. Power Electronics MSc

Bipolar Junction Transistors (BJT) Used commonly in the past Now used in specific applications Replaced by MOSFETs and IGBTs 2011.10.06. Power Electronics MSc

Various Configurations of BJTs 2011.10.06. Power Electronics MSc

MOSFETs Easy to control by the gate Optimal for low-voltage operation at high switching frequencies On-state resistance a concern at higher voltage ratings 2011.10.06. Power Electronics MSc

Gate-Turn-Off Thyristors (GTO) Slow switching speeds Used at very high power levels Require elaborate gate control circuitry 2011.10.06. Power Electronics MSc

GTO Turn-Off Needs a turn-off snubber 2011.10.06. Power Electronics MSc

IGBT 2011.10.06. Power Electronics MSc

Mos Controlled Thyristor (MCT) 2011.10.06. Power Electronics MSc

Comparison of Controllable Switches 2011.10.06. Power Electronics MSc

Summary of Device Capabilities 2011.10.06. Power Electronics MSc