![]() This will result in close to full voltage. The lower trace shows the trigger close to the start of the cycle. The upper trace shows the trigger delayed close to the end of the cycle. If triggered early in the cycle (lower trace) the RMS voltage will be high. If the triac is triggered late in the cycle (upper trace) the RMS voltage is low. The result is a phase-angle controlled waveform as shown in Figure 2. ![]() One of the triac’s characteristics is that once triggered the triac will remain on until the current falls below the hold-on value which is close to zero (typically about 50 mA).When the voltage on C1 reaches about 20 V the DIAC breaks down and the charge in C1 flows into the trigger of T1 turning it on.As the mains voltage rises C1 starts to charge up at a rate determined by the setting of R1 the lower the value of R1 the faster C1 charges up.A bare-bones incandescent lamp dimmer circuit.įigure 1 shows a typical triac dimmer for incandescent lamps. Symbols for non-dimmable and dimmable LED lamps. In this article we explain how filament lamp dimmers work and some of the issues that can occur with LED lamps. Those that are may require special dimmers to operate.
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