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From: tedk@ihuxv.ATT.COM (Kekatos)
Newsgroups: rec.railroad,sci.electronics
Subject: Re: Thyristors
Message-ID: <2236@ihuxv.ATT.COM>
Date: Fri, 13-Nov-87 19:17:51 EST
Article-I.D.: ihuxv.2236
Posted: Fri Nov 13 19:17:51 1987
Date-Received: Sun, 15-Nov-87 19:35:00 EST
References: <3226@aw.sei.cmu.edu> <3165@husc6.UUCP> <4948@sdcrdcf.UUCP>
Reply-To: tedk@ihuxv.UUCP (55624-Kekatos,T.G.)
Distribution: na
Organization: AT&T Bell Laboratories - Naperville, Illinois
Lines: 30
Keywords: mechanism of operation
Xref: mnetor rec.railroad:917 sci.electronics:1733

In article <4948@sdcrdcf.UUCP> darrelj@sdcrdcf.UUCP (Darrel VanBuer) writes:
>In article <3165@husc6.UUCP> lucius%tardis.harvard.edu@harvard.harvard.edu (Lucius Chiaraviglio) writes:
>>In article <3226@aw.sei.cmu.edu> rsd@sei.cmu.edu (Richard S D'Ippolito) writes:
>>>Thyristors are solid state switches used to control power, and are found in
>>	Yes, but how do they work?  Are they sort of like giant transistors?
>Yes, sort of, however unlike a transistor, once turned on, they stay on
>until power is removed (usual method for AC current which goes to 0 120
>times a second), or a large enough inverse gate current is supplied to turn
>it off again.  Also, they are switch mode devices, only ON or OFF.  Power
>regulation is achieved by varying the on time duty cycle.
>-- 
>Darrel J. Van Buer, PhD; unisys; 2525 Colorado Ave; Santa Monica, CA 90406

Thyristors act like two SCR's in one device. An SCR switches to
full on when proper gate trigger (current) is applied. I can not
be turned off unless the load circuit is current is removed (as stated
above). If I'm not mistaken, A Thyristor could be subsututed by
two SCRs.    





  
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