10_Ryan Rushforth_Thyristor

10_Ryan Rushforth_Thyristor - Thyristors Thyristors Ryan...

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Unformatted text preview: Thyristors Thyristors Ryan Rushforth ECE 3080 April 20, 2011 2 Objective Objective • Understanding of Thyristors in terms of: Functionality Applications Key Design Tradeoffs 3 Background Background • Solid state, three terminal, semiconductor device with four layers of alternating N and P ‐ type material or three PN junctions • Mainly used in high ‐ power switching applications 4 The I A-V AK Curve The I A-V AK Curve • Forward bias breakdown voltage (V BF ) at J2 • Reverse bias breakdown voltage (V BR ) at J1 or J3 • States: 1.Reverse Blocking 2.Equilibrium 3.Forward Blocking 4.Forward Conducting 1 2 3 4 I H 5 Forward Biased Thyristor Forward Biased Thyristor • Apply positive voltage at the gate causing breakdown • Different V G values can easily switch thyristor to “on state” • V G > V BR , Avalanche Breakdown occurs causing conduction • Device is latched, conduction continues until V G removed or I A < I H 6 Energy Band Diagram(pnpn) Energy Band Diagram(pnpn)...
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This note was uploaded on 08/23/2011 for the course ECE 3080 taught by Professor Staff during the Spring '08 term at Georgia Tech.

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10_Ryan Rushforth_Thyristor - Thyristors Thyristors Ryan...

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