Module 4 thyristors
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The document discusses thyristors, highlighting their characteristics, including hysteresis behavior, and compares them to pairs of transistors. It details specific types of thyristors like Shockley diodes, diacs, silicon controlled rectifiers (SCR), triacs, and opto thyristors, as well as their applications in rectifying AC and controlling power output. Additionally, the document lists recommended resources and books related to electronics and aviation-related electricity.
Module 4 thyristors
- 1. Thyristors
- 2. Characteristics Hysteresis character ◦ It latches to its last position, on or off ◦ Example, physical s/w – you s/w it on, it remains on. May be viewed as 2 transistors working in pair. Constructed from bipolar junction technology.
- 3. Examples of Thyristors Shockley diode DIAC SCR (silicon controlled rectifier) TRIAC Opto thyristors
- 4. Shockley Diode Not to be confused with schottky diode It is a four layer device Also known as PNPN diode.
- 5. The Working of the Shockley Diode The four PNPN can be simplified to two set of separate transistors, PNP and NPN. P N P N P N
- 6. With high voltage, one of the transistor will be turned on causing the other to be on. Once on, the transistors latched. To turn off, the voltage must be reduced to cause the current to drop below minimum
- 7. DIAC Shockley diode works with DC. For AC, 2 shockleys are joint. The result is shown in the lower image
- 8. SCR Silicon Controlled Rectifiers or thyristors. Used to rectify AC and control the power output.
- 9. TRIAC Dimmer
- 10. TRIAC FOR AC
- 11. Opto- tyristors
- 12. RESOURCES My Blog CAA UK Recommended Books Title Author Aircraft Electricity and Eisman 0-02-801859-1 Electronics Art of Electronics Horowitz 0-521-37095-7 Horowitz /Hill /Hill Elements of Hickey/ 0070286957 Electronics Villines Modern Aviation Helfrich 0-13-118803-8 Electronics Micro Electronics in E Pallet 0-273-08612-X Aircraft systems