Triac (industrial electronic)

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Triac (industrial electronic)

  1. 1. Chapter 2Triode for Alternating Current (TRIAC)
  2. 2. Basic Operation (a) symbol (b) Equivalent circuit Triac can conduct current in either direction and formally called bidirectional triode thyristor Closely related to SCRDifferences between Triac and SCR Triac is bidirectional devices (can conduct current in either direction) while SCR is unidirectional devices (can conduct current only in one way) force commutation by reversed biasing cannot be employed. TRIACs can be triggered by either a positive or a negative current applied to its gate electrode while SCR can only triggered when a positive current apply to the gate terminalIn order to create a triggering current, a positive or negative voltage has tobe applied to the gate with respect to the A1 terminal (otherwise known asMT1). EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  3. 3. Parameter of TRIAC EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  4. 4. Comparison between SCR andTRIAC EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  5. 5. Characteristic It can be seen that it is an extension IV characteristic of SCR The characteristic are symmetrical about the first and the third quadrants It shows the gate can be used to control the main current flow in either direction TRIAC will be continuously ON until the current through A1 to A2 are below the holding current EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  6. 6. Triggering Method The phase shifting method of firing TRIAC is similar to the firing of the SCR The major difference in the waveform is there is a negative portion in the waveform of TRIAC It shows the gate can be used to control the main current flow in either direction EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  7. 7. Turning the TRIAC ON EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  8. 8. Example EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  9. 9. Example EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  10. 10. Exercise EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  11. 11. Exercise EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  12. 12. Quiz EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012
  13. 13. Assignment EAD 3043 (Industrial Electronic) Nor Aida Idayu Binti Abdullah. 2012

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