Transcription of Thyristor Theory and Design Considerations
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Thyristor Theory and Design Considerations
Theory and Design ConsiderationsHandbookHBD855/DRev. 1, Nov 2006 SCILLC, 2005 Previous Edition 2005 as Excerpted from DL137/D All Rights Reserved 2 ABOUT THYRISTORST hyristors can take many forms, but they have certainthings in common. All of them are solid state switcheswhich act as open circuits capable of withstanding therated voltage until triggered. When they are triggered,thyristors become low impedance current paths andremain in that condition until the current either stops ordrops below a minimum value called the holding a Thyristor has been triggered, the trigger current canbe removed without turning off the controlled rectifiers (SCRs) and triacs are bothmembers of the Thyristor family. SCRs are unidirectionaldevices where triacs are bidirectional. An SCR isdesigned to switch load current in one direction, while atriac is designed to conduct load current in , all thyristors consist of several alternatinglayers of opposite P and N silicon, with the exact structurevarying with the particular kind of device.
surge currents of 50, 80 and 100 amps, with breakover voltages from 77 to 400 volts. NP Series Thyristor Surge Protector Devices (TSPD) protect telecommunication circuits such as central office, access, and customer premises equipment from overvoltage conditions. These are bidirectional devices so they are able to have
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