A dimmer is an electrical device used to control the light output from a luminaire. It should:
● Provide continuously variable control of the light output.
● Be easy to remotely control the dimmer with a simple fader.
● Dim the light progressively, with an appropriate law, which should not vary with the load, whether it be a 2 kW or 150 W lamp.
● Not be wasteful of power.
● Not cause interference to other equipment and be silent in operation.
● Be compact.
● Be easy to maintain.
The modern dimmer consists of two thyristors or silicon-controlled rectifiers (SCR) connected back-to-back as shown in figure C. The diodes do not conduct until switched on by a suitable pulse at the gate ...