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FAQ - 12V Transformers and LED Compatibility When considering LED retrofit options for MR16/GU5.3 halogen downlights, the buyer should factor in not only light quality but transformer compatibility as well. Replacing your existing 12VAC transformers in addition to your downlights can be costly and inconvenient, making it important that replacement LED downlights work well with your existing installation.
The likelihood of compatibility between a 12V LED light and a 12VAC halogen transformer depends on a few factors: - The type of transformer (Electronic vs. LED Driver) Magnetic transformers will generally work with all MR16 LED lights, albeit at the cost of efficiency and extra power consumption as was explored in. 'LED drivers' are electronic DC power regulators designed specifically for DC LED lighting. They are not suitable for 12VAC (halogen or LED retrofit) lighting. The fundamental difference between LED driver and 12VAC electronic transformer outputs can be found - If the transformer is electronic, it's particular power supply circuitry and load requirements Electronic 12VAC halogen transformers can vary significantly in design and consequently in how they respond (or do not respond) to different loads. The LED light MR16 LED lights vary in complexity across manufacturers and model designs. The most basic 12V retrofit LED downlight will include the DC LED chips for the light source, and a bridge rectifier composed of diodes to deliver DC to the LEDs from the AC transformer supply.
Some LED lights, such as the DR450 by Brightgreen and the 10W Philips Master, have additional modules that intentionally alter the load seen by the transformer to better replicate the load characteristics of 12VAC halogens and thus ensure broader (but not necessarily universal) compatibility with electronic transformers. Experiment Outline The output waveform of several electronic transformers for 12VAC MR16 lighting was measured using a Tektronix DPO2012B oscilloscope. A sample of LED lights was used on each transformer to assess it's compatibility and output quality when handling different loads. No dimmers were used in the test circuit. The electronic transformers tested were: Tridonic Atco Possum, PoweRun Model No. 410-60, OSRAM Redback and a Tridonic Atco speedy.
Their specified load requirements were 0.1-0.3 A, 20-60 W, 20-60W and 0.1-0.3 A, respectively. An Atco TM50-2 wire wound transformer was used for comparison. Download easybcd for mac.
The primary winding for each transformer was connected to 246 (nominally 230) VAC mains, operating at 50 Hz. 35W Halogen Downlight The transformers' output voltage waveforms when powering a can be seen in the figures below. The load input of the wirewound transformer can be seen to be a simple 50 Hz sine wave.
In contrast, the electronic transformers output a high frequency switching signal ranging from approximately 37 kHz to 79 kHz, enveloped within a 100 Hz waveform. Despite the differences in the voltage waveform, all five transformers successfully powered the 35W Halogen light with no perceptible flicker or obvious difference in light output.
Power consumption: 37.9 W Power factor: 0.99 Figure 1(j) Atco speedy Electronic Transformer LED Testing Three LED lights from different manufacturers were tested on each transformer including a Brightgreen downlight, a, and a. The switching frequencies and of the electronic transformers when supplying identical loads varied greatly, however while power losses do tend to increase with an increase in switching frequency, the power consumed across transformers given the same load varied little (within ± 0.2 W). The power losses as a direct consequence of increased switching frequency can therefore be viewed as negligible. When erratic disruptions in the waveform were observed for a light/transformer combination, this usually coincided with noticeable flicker. Brightgreen DR450 7W Retrofit Downlight. Speedy Electronic Transformer Power consumption: 11.3 W Power factor: 0.99 Lucci LEDlux 6W LED The LED failed to turn on when supplied using the Possum or speedy electronic transformers.
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Based on the voltage outputs of these transformers taken above, they are likely to have very similar internals and consequently similar responses to identical loads. Both transformers specify a minimum load requirement of 0.1 A. Unlike the 7W DR450 and the 10W Philips Master LEDs, the Lucci LEDlux 6W LED does not 'simulate' the load characteristics of a halogen, resulting in it not being 'recognised' by the transformer. 12VAC Electronic Transformers and LED Drivers LED drivers and electronic transformers for retrofit LED lighting are not interchangeable.
They differ in output and load compatibility i.e. Which LED lights they will work with.
The fundamental difference between the two is that LED drivers output DC while electronic halogen transformers output 12VAC. The difference in their voltage outputs can be seen in figure 6. The yellow voltage signal is that supplied by a Redback electronic transformer to a Philips retrofit LED light. It oscillates about 0V, regularly switching polarity with a measured output of 11.9VAC. The white voltage signal is that supplied by a LED driver by Brightgreen to their D900 Curve LED downlight. The voltage is approximately 36.5V (oscillating slightly on account of voltage ripple from the 50 Hz mains) DC.
LED Driver (white) and 12VAC Electronic Transformer (yellow) outputs The DC output of LED drivers has the advantage of practically eliminating voltage drop and reducing radiated RFI. Related Pages.
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