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Presentation on theme: "CONTROLLABLE SWITCHES"— Presentation transcript:

Overview Power Electronics MSc

2 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 Power Electronics MSc

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

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

5 Various Configurations of BJTs
Power Electronics MSc

6 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 Power Electronics MSc

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

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

9 IGBT Power Electronics MSc

10 Mos Controlled Thyristor (MCT)
Power Electronics MSc

11 Comparison of Controllable Switches
Power Electronics MSc

12 Summary of Device Capabilities
Power Electronics MSc


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