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    how-To-Dim-Led-Lighting-In-The-Home: Translate Get PDF

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    Engr. Abdullah
    There are several methods for dimming LED lighting in the home, with the most common being pulse-width modulation (PWM) dimming and TRIAC dimming. PWM dimming works by rapidly switching the voltage on and off at variable speeds, while TRIAC dimming switches even faster to avoid flickering. Both methods require a dimming signal like 0-10V to control the brightness level. Other protocols like DALI and DMX are also used to dim LEDs and control multiple light zones in the home.

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    how-To-Dim-Led-Lighting-In-The-Home: Translate Get PDF

    Uploaded by

    Engr. Abdullah
    85 views4 pages
    There are several methods for dimming LED lighting in the home, with the most common being pulse-width modulation (PWM) dimming and TRIAC dimming. PWM dimming works by rapidly switching the voltage on and off at variable speeds, while TRIAC dimming switches even faster to avoid flickering. Both methods require a dimming signal like 0-10V to control the brightness level. Other protocols like DALI and DMX are also used to dim LEDs and control multiple light zones in the home.

    Original Description:

    Resistive Dimmer

    Original Title

    Resistive Dimmer

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    There are several methods for dimming LED lighting in the home, with the most common being pulse-width modulation (PWM) dimming and TRIAC dimming. PWM dimming works by rapidly switching the voltage on and off at variable speeds, while TRIAC dimming switches even faster to avoid flickering. Both methods require a dimming signal like 0-10V to control the brightness level. Other protocols like DALI and DMX are also used to dim LEDs and control multiple light zones in the home.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    85 views4 pages

    how-To-Dim-Led-Lighting-In-The-Home: Translate Get PDF

    Uploaded by

    Engr. Abdullah
    There are several methods for dimming LED lighting in the home, with the most common being pulse-width modulation (PWM) dimming and TRIAC dimming. PWM dimming works by rapidly switching the voltage on and off at variable speeds, while TRIAC dimming switches even faster to avoid flickering. Both methods require a dimming signal like 0-10V to control the brightness level. Other protocols like DALI and DMX are also used to dim LEDs and control multiple light zones in the home.

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    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 4

    Introduction

    electrical-engineering-portal.com /how-to-dim-led-lighting-in-the-home
    Joe Watts Translate Get PDF

    LED

    Ho w to Di m LED Li g h ti n g i n th e Ho m e ? ( O n p h o to Di m m e r S wi tch )

    lighting in the home is becoming more popular due to the energy and money saving benefits it offers over traditional halogen lighting. One of the most common problems that an electrician faces when installing LEDs is enabling them to dim.

    Resistive Dimming
    Resistive dimming has become a standard way of dimming halogen lighting and it works by reducing the voltage allowed to the bulb with a variable resistor. A resistive dimmer switch is easy to install because it is simply wired between the mains (240V) power and the bulb, however whilst the lighting is dimmed the voltage resistance is converted to heat and is not considered energy efficient.

    LEDs use between 12V to 48V so a transformer is required to convert mains power (110V-240V ) to the required reduced voltage. Using a resistive dimmer between the main voltage and the transformer will damage the transformer and using a resistive dimmer between the transformer and the LED will cause it to flicker instead of dimming. Not e: LEDs cannot be dimmed using resistive dimming; it will slowly damage the LEDs.

    Pulse-Width Modulation Dimming


    Pulse-width modulation works by switching the voltage on and off at a variable speed. This causes a flickering effect that is too quick for the human eye to see. By increasing and decreasing the switching speed it increases and decreases the max possible light output and dims the LED. PWM dimming is energy efficient because unlike the resistive dimming the more the LED is dimmed the less wattage it uses. A problem found with PWM dimming is as the amount of dimming increases so does the amount of time the voltage is turned off. This will eventually fall within the flickering speed in which the human eye can see. This flickering can normally be seen when the LED is dimmed to below 10% of its original light output.

    Fi g u r e 1 - P u l s e -Wi d th Mo d u l a ti o n Di m m i n g

    T RIAC Dimming
    A TRIAC (Triode for Alternating Current ) dimmer works by conducting the current in both directions, alternating at a variable speed. This makes the switching much faster than Pulse- width modulation dimming so it never goes within the flickering speed of the human eye.

    Fi g u r e 2 - TRIAC Di m m i n g

    Dimming Signals
    Both PWM and TRIAC dimmer modules require a signal to tell the dimmer how much to dim the LEDs. The current standard is 0-10V .

    0-10V Dimming
    0- 10V signals work by sending a separate 10v signal to the PWM/TRIAC dimmer module and then using a resistive dimmer to reduce the voltage on the 10V signal. As the voltage drops the dimmer module reduces the brightness on the LEDs in relation to the voltage. Example: 10V = Dim at 100% 8V = Dim at 80% 3V =Dim at 30%

    DALI Dimming
    DALI is an open source 2 way protocol designed for controlling lighting in the home. It is a royalty free standard meaning it is possible to mix and match DALI modules from different manufactures. DALI works by assigning z ones and linking all the DALI modules for each z one together. The DALI controller can then control multiple z ones individually.

    DMX Dimming
    The DMX 512 protocol was originally designed to control nightclub and theatre lighting and has only recently started to be used in the home. DMX works by sending a data signal with a value between 0- 255 on each channel. There can be a maximum of 512 channels and the signal carries the information for all the channels to each dimmer module receiving the DMX. This means that each dimmer module is given a DMX address so it knows which channel to read and adjust the brightness accordingly. Each dimmer module has a DMX In and DMX out socket so the data signal can be daisy chained from one module to next. DMX can control colour changing lighting as well as non- lighting devices. E.G. Fog machines, Blinds and even

    motorised doors.

    EEP recommends

    Joe Wat t s - I have been a lighting engineer for 10 years and currently work for Instyle LED Ltd. I have a Degree in computing and specializ e in DMX programming for nightclubs and Bars. Become EEP's Contributor and introduce yourself to 70k+ of our readers all across the web.

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