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Triac Circuit Templates

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Triac Circuit Templates

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  1. Triac Circuit Templates This presentation is partially animated. Only use the control panel at the bottom of screen to review what you have seen. When using your mouse, make sure you click only when it is within the light blue frame that surrounds each slide.

  2. 0 0 0 0 0 0 0 0 0 + collector base pn junction + emitter p n anode + n 2 pn junctions p + n cathode + + This diode is forward biased volt This transistor is in conduction anode N.O. 1 pn junction anode A p gate + cathode n pn junctions 2 pn junctions + p + n 3 pn junctions + G K gate input N.C. This silicon-controlled rectifier (SCR) circuit provides ON/OFF motor control

  3. anode gate cathode high current power (FCE) circuit Low current control circuit N.C. anode A + p n + p + 4 layer pnpn diode n + (When active current flows but only in one direction) G K gate input N.O. 3 pn junctions silicon-controlled rectifier (SCR) circuit

  4. anode 1 gate anode 1 cathode n fuse p anode 1 n All three external connections cross a pn junction. N.O. p n secondary anode 2 gate input Triacs are designed for alternating current applications. By virtue of fact that you are using this tutorial, you are not ready to work with triacs. n Triacs are used to switch on ac equipment such as lamps, motors, etc. Caution: This is a cartoon circuit!! 5 pn junctions Do not assemble this circuit!!! Triac circuit

  5. anode 1 gate anode 1 cathode n fuse p anode 1 n N.O. p n gate input secondary anode 2 n Triacs are two parallel SCR’s arranged to permit alternating current flow only when the gate receives current. Triacs are used to switch on ac equipment such as lamps, motors, etc. Caution: This is a cartoon circuit!! Do not assemble this circuit!!! Triac circuit

  6. anode 1 gate anode 1 cathode n fuse p anode 1 n N.O. p n gate input secondary anode 2 n Triacs are two parallel SCR’s arranged to permit alternating current flow only when the gate receives current. Remove the gate current and the triac switches OFF the next time the current passes through zero amps. Caution: This is a cartoon circuit!! Do not assemble this circuit!!! Triac circuit

  7. anode 1 gate anode 1 cathode Light will delay going off until current flow crosses zero amps. n fuse p anode 1 n Hold this button in to keep light ON. N.O. p n gate input Release this button to turn light OFF. secondary anode 2 n The ON/OFF cycle/sec can not be faster than the ac current cycle/sec (frequency) Remove the gate current and the triac switches OFF the next time the current passes through zero amps. Caution: This is a cartoon circuit!! Do not assemble this circuit!!! Triac circuit

  8. anode 1 gate anode 1 High current Triac Low current Triac cathode n fuse p anode 1 n N.O. p n gate input secondary anode 2 n Caution: This is a cartoon circuit!! Do not assemble this circuit!!! Triac circuit

  9. anode 1 gate anode 1 High current Triac Low current Triac cathode Remove the gate current and the triac switches OFF the next time the current passes through zero amps. fuse anode 1 N.O. secondary anode 2 gate input Caution: This is a cartoon circuit!! Do not assemble this circuit!!! Triac circuit

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