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How Triac works as a switch?

  • We now know that a “Triac” is a 4-layer, PNPN in the positive direction and an NPNP in the negative order, a three-terminal bidirectional device that blocks current in its “OFF” state acting like an open-circuit switch. Still, unlike a conventional thyristor, the Triac can conduct current in either direction. 

What are the three types of dimmers?

  • Dimmers can come in many different styles, including toggles, rotaries, touch-sensitive, and in a variety of colors.
  • Most dimmers fall into these four bulb type categories:
  • Incandescent and halogen bulbs.
  • Dimmable compact fluorescent light bulbs.
  • Magnetic Low Frequency (MLV)
  • Electronic Low Frequency (ELV)

Why are ELV dimmers so expensive?

  • An Electronic Low Voltage (ELV) dimmer used in conjunction with an LED (light-emitting diode) is almost a match made in heaven. … They have a higher cost because of this, but most LED lights come with a warranty of some caliber.

Can you use a regular Dimmer for LED lights?

  • A standard dimmer switch cannot be used with an LED light as you will never be able to dim the LED light either entirely or not very well. LED lights to need their own special electronic dimmer switch to have a fully functioning and covering light.

Is a Triac a transistor?

  • A Triac is a small semiconductor device, similar to a diode or transistor. Like a transistor, a Triac is made up of different layers of semiconductor material.

What is a DALI dimmer?

  • DALI (Digital Addressable Lighting Interface)
  • These dimmer switches use a digital protocol to send a dimming control signal to a driver down separate wires to the mains supply. They do not directly control the energy passed to the driver. Lamps are never (now) DALI dimmable.


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