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EEL 4242 POWER ELECTRONICS

EEL 4242 POWER ELECTRONICS . THYRISTORS. Thyristor Symbol . Figure 7.1 . Cross Sections of Thyristors . Figure 7.2 . Characteristics of Thyristors . Figure 7.3 . Two Transistor Model of Thyristors. Figure 7.4 . Current Gain with Emitter Current. Figure 7.5 . Two Transistor Model.

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EEL 4242 POWER ELECTRONICS

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  1. EEL 4242 POWER ELECTRONICS THYRISTORS

  2. Thyristor Symbol Figure 7.1

  3. Cross Sections of Thyristors Figure 7.2

  4. Characteristics of Thyristors Figure 7.3

  5. Two Transistor Model of Thyristors Figure 7.4

  6. Current Gain with Emitter Current Figure 7.5

  7. Two Transistor Model Figure 7.6

  8. Gate Turn-On of Thyristors Figure 7.7

  9. Gate Turn-On Characteristics Figure 7.8

  10. Line Commutated Thyristor Circuit Figure 7.9

  11. Line Commutated Thyristor Circuit Figure 7.9

  12. GTOs Figure 7.15

  13. GTO Turn-on and Turn-off Pulses Figure 7.16

  14. di/dt Protection Figure 7.32

  15. dv/dt Equivalent Figure 7.33

  16. SPICE Model Figure 7.34

  17. Summary • A thyristor is a latching device and it can be turned on with a small gate pulse, typically 100 µs . • Thyristors are generally off by line commutation due to the natural behavior of the input line supply. • During the turn-off process, thyristors must be subjected to a reverse voltage for a certain minimum time known the turn-off. • What was the major idea? • What was the muddiest idea?

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