Transformers output a high frequency switching signal ranging from approximately 37 kHz to 79 kHz, enveloped Load input of the wirewound transformer can be seen to be a simple 50 Hz sine wave. The transformers' output voltage waveforms when powering a 35W Osram Halogen can be seen in the figures below. Transformer was connected to 246 (nominally 230) VAC mains, operating at 50 Hz. An Atco TM50-2 wire wound transformer was used for comparison. Their specified load requirements were 0.1-0.3 A, 20-60 W, 20-60W and 0.1-0.3 A, respectively. The electronic transformers tested were: Tridonic Atco Possum, PoweRun Model No. No dimmers were used in the test circuit. A sample of LED lights was used on each transformer to assess it's compatibility and output The output waveform of several electronic transformers for 12VAC MR16 lighting was measured using a TektronixĭPO2012B oscilloscope. Necessarily universal) compatibility with electronic transformers. 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 Some LED lights, such as the DR450 by Brightgreen and the 10W Philips Master, The most basic 12V retrofit LED downlight will include the DC LED chips for the light source,Īnd a bridge rectifier composed of diodes to deliver DC to the LEDs from the AC transformer supply. MR16 LED lights vary in complexity across manufacturers and model designs. If the transformer is electronic, it's particular power supply circuitry and load requirementsĮlectronic 12VAC halogen transformers can vary significantly in design and consequently in how they respond (or do not respond) to different loads. The fundamental difference between LED driver and 12VAC electronic transformer outputs can be found further down the page. They are not suitable for 12VAC (halogen or LED retrofit) lighting. ![]() 'LED drivers' are electronic DC power regulators designed specifically for DC LED lighting. ![]() Magnetic transformers will generally work with all MR16 LED lights, albeit at the cost of efficiency andĮxtra power consumption as was explored in this FAQ article. The type of transformer (Electronic vs. The likelihood of compatibility between a 12V LED light and a 12VAC halogen transformer depends on a few factors: Replacing your existing 12VAC transformers in addition to your downlights can be costly and inconvenient, making it important that replacement LED downlights work well 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. FAQ - 12V Transformers and LED Compatibility
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