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Thyristors

2. Thyristors. Switching Semiconductor DevicesOff and maximum resistanceOn and minimum resistanceTypically Switch PowerUsually high current and/or high voltagesAC loads most commonlyDC loads under special conditions. 3. Types of Thyristors. SCR - Silicon Controlled RectifiersUJT - Unijunction

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Thyristors

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    1. 1 Chapter 3 Thyristors

    2. 2 Thyristors Switching Semiconductor Devices Off and maximum resistance On and minimum resistance Typically Switch Power Usually high current and/or high voltages AC loads most commonly DC loads under special conditions

    3. 3 Types of Thyristors SCR - Silicon Controlled Rectifiers UJT - Unijunction Transistor Diac Triac IGBT - Insulated Gate Bipolar Junction Transistor

    4. 4 SCR – Silicon Controlled Rectifier A Four-Layer Device Operation Like a switch with a diode in series Cathode to Anode current only flows when triggered Triggered by drawing Gate current When Gate to Cathode voltage reaches about +0.5 to about 1.0 volts, Gate current will flow

    5. 5 Current-Voltage Characteristics Anode (+) Cathode (-) Gate trigger current will turn on SCR Anode current (IA) flows

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