3-Ryan Curtin Thyristors presentation

3-Ryan Curtin Thyristors presentation - R YAN C URTIN...

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Unformatted text preview: R YAN C URTIN Thyristors - p. 1/20 Thyristors: pnpn Devices Ryan Curtin ECE3080 What is a thyristor? Introduction To Thyristors Band Structure How does it work? How is it used? Cutting-edge developments Questions and Comments R YAN C URTIN Thyristors - p. 2/20 Introduction To Thyristors A thyristor is a three-junction device used mainly in high-power switching applications. What is a thyristor? Introduction To Thyristors Band Structure How does it work? How is it used? Cutting-edge developments Questions and Comments R YAN C URTIN Thyristors - p. 3/20 Band Structure squaresolid Region 1: highly-doped p-type ( 10 19 cm- 3 ) squaresolid Region 2: lightly-doped n-type ( 10 14 cm- 3 ) squaresolid Region 3: moderately doped p-type ( 10 18 cm- 3 ) squaresolid Region 4: very highly-doped n-type ( 10 20 cm- 3 ) What is a thyristor? How does it work? I-V Curve Diode Model Transistor Model Band Analysis (1) Band Analysis (2) Band Analysis (3) Band Analysis (4) Gate Voltage How is it used? Cutting-edge developments Questions and Comments R YAN C URTIN Thyristors - p. 4/20 I-V Curve Breakdown voltage drops are several orders of magnitude higher than voltage drops in the conducting region. What is a thyristor? How does it work? I-V Curve Diode Model Transistor Model Band Analysis (1) Band Analysis (2) Band Analysis (3) Band Analysis (4) Gate Voltage How is it used? Cutting-edge developments Questions and Comments R YAN C URTIN Thyristors - p. 5/20 Diode Model Modeling the device as three diodes (and ignoring the gate input) shows switching characteristics of the device. Forward biasing the device enough will cause diode J2 to break down. Reverse bias will cause diodes J1 and J3 to break down. This model does not account for the conduction region. What is a thyristor?...
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3-Ryan Curtin Thyristors presentation - R YAN C URTIN...

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