FIGURE 18-1 Rheostat-controlled lamp circuit. Dale R. Patrick Electricity and Electronics: A Survey,...

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FIGURE 18-1 Rheostat-controlled lamp circuit.

Dale R. PatrickElectricity and Electronics: A Survey, 5e

FIGURE 18-2 Voltage-controlled lamp circuit.

FIGURE 18-3 Switch-controlled lamp circuit.

FIGURE 18-4 SCR crystal: (a) symbol; (b) structure.

FIGURE 18-4 continued SCR crystal: (a) symbol; (b) structure.

FIGURE 18-6 Equivalent SCR.

FIGURE 18-7 SCR response.

FIGURE 18-8 I-V characteristics of an SCR.

FIGURE 18-9 Gate current characteristics of an SCR.

FIGURE 18-10 Dc power control switch.

FIGURE 18-11 Dc power control circuit.

FIGURE 18-12 SCR power control switch.

FIGURE 18-13 Phase control SCR circuit and waveforms.

FIGURE 18-14 Triac symbol and crystal structure.

FIGURE 18-15 Triac condition polarities: (a) forward conduction, T1-,T2+,G+; (b) reverse condition.

FIGURE 18-16 I-V characteristics of a triac.

FIGURE 18-17 Triac switching circuits: (a) static triac switch; (b) three-position static switch.

FIGURE 18-17 continued Triac switching circuits: (a) static triac switch; (b) three-position static switch.

FIGURE 18-18 Start-stop control.

FIGURE 18-19 Variable lamp control.

FIGURE 18-20 Operating states of a triac: (a) 100% power; (b) 75% power; (c)50% power; (d) 25% power; (e) 0% power.

FIGURE 18-21 Basic triac phase shifter.

FIGURE 18-22 Two-stage phase shifter for a triac.

FIGURE 18-23 Diac: (a) crystal structure; (b) symbols; (c) I-V characteristics.

FIGURE 18-23 continued Diac: (a) crystal structure; (b) symbols; (c) I-V characteristics.

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