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about thyristors

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  1. 1. Thyristors
  2. 2. Silicon-Controlled Rectifiers Figure 24-1. Simplified SCR.
  3. 3. Silicon-Controlled Rectifiers (cont’d.) Figure 24-4. Schematic symbol for an SCR.
  4. 4. Silicon-Controlled Rectifiers (cont’d.) Figure 24-5. Common SCR packages.
  5. 5. Silicon-Controlled Rectifiers (cont’d.) Figure 24-7. Removing power in a DC circuit.
  6. 6. TRIACs Figure 24-9. Equivalent TRIAC.
  7. 7. TRIACs (cont’d.) Figure 24-10. Simplified TRIAC.
  8. 8. TRIACs (cont’d.) Figure 24-11. Schematic symbol for a TRIAC.
  9. 9. TRIACs (cont’d.) Figure 24-12. Common TRIAC packages.
  10. 10. TRIACs (cont’d.) Figure 24-13. TRIAC AC switch circuit.
  11. 11. TRIACs (cont’d.) Figure 24-14. TRIAC AC control circuit.
  12. 12. Bidirectional Trigger Diodes Figure 24-15. Simplified DIAC.
  13. 13. Bidirectional Trigger Diodes (cont’d.) Figure 24-17. Schematic symbol for a DIAC.
  14. 14. Bidirectional Trigger Diodes (cont’d.) Figure 24-18. Variable full-wave phase-control circuit.
  15. 15. Testing Thyristors Commercial test equipment Ohmmeter
  16. 16. Summary Thyristors include SCRs, TRIACs, and DIACs An SCR controls current in one direction by a positive gate signal SCRs can be used to control current in both AC and DC circuits TRIACs are bidirectional triode thyristors
  17. 17. Summary (cont’d.) TRIACs control current in either direction by either a positive or negative gate signal Because TRIACs have nonsymmetrical triggering characteristics, they require the use of a DIAC DIACs are bidirectional trigger diodes Thyristors can be tested using commercial transistor testers or ohmmeters