Magnetic Levitation + Wireless Power Transfer = Floating Light Bulb

Posted on Feb 6, 2014

18-year-old electrical engineer student, Chris Rieger, has been working on his levitating light bulb project ” fittingly referred to as the LevLight Project  ” for about six months now. Recently he posted images and a video of the project, both of which have since made their rounds on tech sites all across the Internet under the headline, Ho

Magnetic Levitation + Wireless Power Transfer = Floating Light Bulb
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w many engineers does it take to float a lightbulb  (It was, admittedly, really hard to not make that the headline here. ) The project is impressive, and Rieger was kind enough to provide Electronic Products with the details of how he worked it out, as well as video of his levitating light bulb in action. Rieger is quick to point out that magnetic levitation is not easy. Countless hours, he explains, were spent pouring over papers and textbooks, reading up on every project ever associated with the technology. There were many failed attempts, and countless components and boards wasted in an effort to get his light bulb off the ground. Rieger used a 3-pin linear Hall Effect sensor to act as a feedback mechanism, and a 1. 325mV/g sensor ” the smallest sensitivity he could find, as the magnetic flux it was sensing was maxing out the reading on others. This was the hardest part of the project, according to Rieger. He started off using 555 oscillators, but found the power transfer wasn`t strong enough and waveform nowhere near useful. He decided to instead update an old but simple design by 4hv. org board member Marko, so as to better limit the heat being generated. He then went ahead and built the wireless power receive circuit: A simple LC circuit tuned at exactly 1Mhz. The aspiring EE then used his scope and components to manually tune it, making small changes over a series of nights to the geometry of the coil to change the...

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