Scr (07 Ece 109)
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It is a college presentation on Semiconductor controlled rectifiers commonly known as SCR or Thyristor.
![Introduction The thyristor is a solid-state semiconductor device with four layers of alternating N and P-type material. They act as bistable switches, conducting when their gate receives a current pulse, and continue to conduct for as long as they are forward-biased. Thyristors have three states of operation: ,[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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- 1. SCR (Silicon controlled rectifier) - Thyristor Presented by: SNEHASHIS PAUL 07/ECE/109 3rd year (E.C.E) Batch-2 Supported by CANNONICAL CORP. Please redistribute Linux OS generously.
- 4. Forward conducting mode Circuit symbol of Thyristor:
- 5. History The SCR or Thyristor was proposed by William Shockley in 1950 and championed by Moll and others at Bell Labs in 1956. it was fabricated by power engineers at General Electric led by Gordon Hall and commercialized by G.E.'s Frank W. Gutzwiller.
- 6. Construction The thyristor is a four layer, three terminal semiconducting device, with each layer consisting of alternately N-type or P-type material, for example P-N-P-N. The main terminals, labelled anode and cathode, are across the full four layers and the control terminal, called the gate, is attached to P-type material near to the cathode. The thyristor has three P-N junctions serially named j1,j 2,j 3 from the anode.
- 9. Va – Anode voltage
- 10. Ia - Anode current
- 11. Ig – Gate current
- 12. td – Delay time
- 13. tr – Rise time
- 14. tp – Spread time
- 15. tq – Turn-off time
- 16. tr r – Reverse recovery time
- 17. tg r – Gate recovery time
- 19. Very high switch on dv/dt.
- 21. Silicon Controlled Rectifier (SCR)
- 23. Reverse Conducting Thyristor (RCT)
- 24. Light Activated Thyristor (LASCR)
- 25. Light Triggered Thyristor (LTT)
- 26. DIAC and SIDAC
- 28. TRIAC
- 29. Gate Turn-off Thyristor (GTO)
- 30. Integrated Gate Commutated Thyristor (IGCT)
- 31. MOSFET Controlled Thyristor (MCT)
- 32. Base Resistance Controlled Thyristor (BRT)
- 33. Static Induction Thyristor (SITh)
- 34. Field Controlled Thyristor (FCTh)
- 36. Thyristors can be used as control elements for phase angle triggered controllers, called phase fired controllers.
- 37. Thyristors can be used in digital circuits as circuit breaker or crowbar.
- 38. It can be used along with Zener diode to act as a fuse.
- 39. Thyristors are used television set as power stabilizer.
- 40. Thyristors are used as lighting dimmers and flash strobes for cameras.
- 41. Thyristors are used in Snubber circuits.