What is phase control dimmer?
What is phase control dimmer?
Phase control is a dimming technique based on the electric wire that is often used for halogen and incandescent lamps. It “clips” part of the sine wave of the alternating current to dim the light.
Is phase dimming the same as ELV?
Some common dimming technologies include Forward Phase, Reverse Phase (ELV), and 0-10V. Forward Phase: Forward phase-cut dimming (commonly referred to as incandescent or Triac dimming) is the most common dimming method. ELV dimmers are generally very compatible with LED loads, offering smoother dimming to low levels.
What is phase selectable dimmer?
The phase-adaptive dimmer controls a wide variety of bulbs by automatically sensing the load type and adjusting to provide the best performance. Because of the dimmer’s flexibility, you’ll be able to change your lamp without changing your dimmer.
Is PWM phase dimming?
PWM is a dimming method that is prevalent in LEDs that use constant-current drivers. This technique works by adjusting the duty cycle of the current, resulting in changes to the average current in the string. To achieve dimming, the LED is toggled at a very rapid rate.
What are the two types of phase-cut dimming?
Phase-cut dimmers can operate on the leading edge (forward phase-cut) or trailing edge (reverse phase-cut) of the waveform.
What is reverse phase dimming?
When you dim a light or light source, you’re not lowering the voltage, you’re actually removing power from the circuit. However, if the voltage is ridden gently, and then just shut off, it ends up being much easier on the electronic circuitry. This is called reverse phase dimming.
What are the two types of phase cut dimming?
What is the difference between phase dimming and 0 10V?
The main difference between 0-10V and 1-10V is the direction of the current between dimmer and driver. 0-10V is a current source system, which means that the dimmer provides the power for the 0-10V signals – a mains connection to the dimmer is necessary.
What do I need to turn on phase cut dimming?
Select the basic control system (make, model, available load type(s) of dimmers). For wall-box dimmers, select a brand and style that offers a range of load options such as INC, MLV, ELV, or has optional interfaces that allow for the control of MLV, ELV or even 0 -10V, as needed.
Why do I need a forward phase control for Reverse Phase Dimming?
These “inductive” type loads require a forward phase control due to potential voltage spikes when current is interrupted in reverse phase. Electronic Low Voltage (ELV) loads generally require reverse phase controls and are not suitable for forward phase dimming.
What kind of transistor is used for phase cut dimming?
These thyristor-based controls are the mainstay of dimmer technology today, although the IGBT (Insulated Gate Bipolar Transistor) is used in some of the newest dimmer designs because it is an easier device to drive and control. All of these devices work by cutting off part of each half cycle of the AC line waveform.
What causes noise in a forward phase dimming system?
The most noticeable source of noise in a forward phase dimming system is the filaments of the lamps being dimmed. When the power is turned on to the lamp part way through the mains cycle, the filament expands very rapidly, and then as the voltage ramps back down again the filament cools.