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3_Power Device 3080 Wonwoo Choi

3_Power Device 3080 Wonwoo Choi - Power Device SiC MOSFET...

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Power Device: SiC MOSFET Wonwoo Choi 4/13/2011 ECE 3080
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Background - What is a Power Device? - Essentially a Switch - Blocks current at off state - Conducts current at on state - Ideally want no energy loss when switching from on/off state - State is on when voltage reaches the breakdown voltage, V BD
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Background - Applications V BD < 1000 V Switch-mode power supplies -Uninterrupted power supply V BD > 1000 V Hybrid vehicles Motor drives Avionics (lower weight) Inverters/converters: alternative energy (solar, wind ) Defense (Navy: electric ships)
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SiC vs Si - Why Silicon Carbide?
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SiC MOSFET SiC MOSFETs perform well Efficient Switching High blocking voltage High temperature High frequency due to high Saturation Velocity
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SiC MOSFET - SiC MOSFETs have a big disadvantage over other SiC (or other materials such as Si) power devices. - Main Reason: High R DSON (On-Resistance) - Ideally want Low On-resistance for no current loss during on state.
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