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Lecture 2 - Power Semiconductor Devices

Lecture 2 - Power Semiconductor Devices -...

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POWER SEMICONDUCTOR  DEVICES OVERVIEW
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Historical 1 st  thyristor SCR developed in 1957 Since 1970, various type of power  electronic devices were developed and  become commercially available.
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Power semiconductor Devices Classification Classification by materials (carrier type)  
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The  two-terminal  devices  (diodes),  whose  state  is  completely dependent on the external power circuit they are  connected to; The  three-terminal  devices,  whose  state  is  not  only  dependent on their external power circuit, but also on the  signal  on  their  driving  terminal  (gate  or  base).  Transistors  and thyristors belong to that category. A  second  classification  is  less  obvious,  but  has  a  strong  influence  on  device  performance:  Some  devices  are  majority  carrier  devices  (Schottky  diode,  MOSFET), while  the  others  are  minority  carrier  devices  (Thyristor, bipolar transistor, IGBT).  The former use only one type of charge carriers, while the  latter  use  both  (i.e  electrons  and  holes).  The  majority  carrier  devices  are  faster,  but  the  charge  injection  of minority  carrier  devices  allows  for  better  On-state performance 
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Common power devices Some common power devices are the power diode, thyristor, power  MOSFET and IGBT. A power diode or MOSFET operates on similar 
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