Lighting Management & Control Systems
DMR.730 FLICKER FREE TRAILING EDGE DIMMER
The light intensity adjustment in a common flicker free dimmer is usually based on IGBTs (Insulated GateBipolarTransistor). These dimmers have the ability to vary the conduction angle of the power supply sinusoidal voltages that regulation of brightness variation of the lamp(s) is achieved. When IGBT is in conduction state it acts as a switch, and consequently the supply voltage is conducted at the dimmer’s output. This means that any fluctuation in the mains voltage is conducted to the lamps and the result is the variation of the lamps’ luminosity. Thus, these dimmers are flicker-free concerning their electronic circuit, but the lamps are flickering because of the dimmer’s weakness to control the fluctuations of the mains system.
The new SMRD (Switch Mode Regulated Dimmer) technology monitors the mains voltage and stabilizes the output voltage so that this remains stable and unaffected from the network’s fluctuations, thus results in the stability of the lamp(s) brightness.
True output regulationSome dimmers available in the market achieve voltage stabilization by regulating the conduction angle. With this method the RMS voltage can remain stable,however there are three disadvantages:
1) Mains voltage must be always higher than the output voltage.
2) By changing the conduction angle, brightness is affected because the LED Lamp(s) luminosity regulation is depended on the conduction angle of the dimmer.
3) When the dimmer is on at full (conduction angle 100%), there is no possibility to further increase the conduction angle in case of a voltage drop from the network.
SMR technology maintains the output voltage stable with no need of higher mains voltage and without changing the conduction angle. This means that even if the dimmer is at 100%, the output remains at full (230V) in power supply voltage range from 173V to 265V.
More features of the SMR Dimmer:LED lamps but also CFLs (Compact Fluorescent Lamps) are usually loads with low power factor(cosθ=0.55-0.75).
Independently from the lamps’ power factor, the new SMR dimmer consumes energy with power factor >0.98 (for output level 100%), without affecting the network.
Lamp protection
Due to the special electronic circuits and stabilization the output voltage is always steady and free from spikes and over-voltages protecting the lamps even from complete failure. Dimming law correction With the use of two trimmers the dead fields, that usually LED and fluorescent lamps have, are eliminated. The first trimmer is used for the minimum and the other one for the maximum brightness of the lamp. In this way the controller works correctly when adjusting the lamps’ brightness.
Master Slave operation
The new SMR dimmer can work as master, controlling multiple SMR dimmers connected at its DMX output. With this feature, as many SMR dimmers as the user likes can be controlled from one controller.
CFLs (Compact Fluorescent Lamps) in order to ignite need operating voltage of more than approximately 50%. Thus, in order to turn on a CFL at 30% for example, the user should first adjust the dimmer over 50% and afterwards dim it at 30%.
The new SMR dimmer is capable of providing a pulse of 100%, of the output voltage, for 1sec automatically, in case we need to turn on the lamps at percentages less than 50%.
Control inputs
The new SMR dimmer incorporates both DMX-512 and analogue inputs. At the analogue input the user can connect 0/10V, or 1/10V, or rheostat 100Klog, or button for ON - OFF and dimming, or UP/DOWN button for ON - OFF and dimming.
PWM signal output
The new SMR dimmer incorporates PWM signal output, providing the capability of driving constant voltage and constant current converters of ELECTRON SA. Thus, with one controller the user can control multiple types of lighting fixtures.
