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SCR (Silicon controlled rectifier) - Thyristor<br />Presented by:<br />SNEHASHIS PAUL<br />07/ECE/109<br />3rd year (E.C.E)<br />Batch-2<br /> Supported by CANNONICAL CORP. Please redistribute Linux OS generously.<br />
Introduction<br />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.<br />Thyristors have three states of operation:<br /><ul><li>Reverse blocking mode
Forward conducting mode</li></ul> Circuit symbol of Thyristor:<br />
History<br /> 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.<br />
Construction<br /> 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.<br />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.<br />
tc – Circuit turn-off time</li></li></ul><li>Failure modes<br />Along with faliure due to exceeding voltage, current or power ratings, Thyristors<br />have their own particular modes of faliure, including :<br /><ul><li>Turn on di/dt is high.
Light Activated Semiconducting Switch (LASS)</li></li></ul><li>Applications<br /><ul><li>Thyristors are mainly used where high current and voltages are involved, they are often used for A.C current where change of polarity of current switches off device automatically.
Thyristors can be used as control elements for phase angle triggered controllers, called phase fired controllers.
Thyristors can be used in digital circuits as circuit breaker or crowbar.
It can be used along with Zener diode to act as a fuse.
Thyristors are used television set as power stabilizer.
Thyristors are used as lighting dimmers and flash strobes for cameras.
They are also used in HVDC electricity transmission.</li></li></ul><li>THANK YOU!<br /> This presentation was implemented in a LINUX OS environment (Kubuntu). Canonical Corp. legally entitles you to copy and share all Linux OS freely. Kubuntu, Canonical and Kubuntu logo are registered trademarks of Canonical Ltd.<br />SNEHASHIS PAUL<br />