Barry's Coilguns |
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Mark 4
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HV Isolation TransformerAny device plugged in to the power mains should be isolated from direct connections by using a transformer. This provides safety from accidental contact, and limits the current in case of short-circuit conditions in the power supply. The circuits shown below describe how an isolation transformer was selected to charge the HV capacitor. Isolation TransformerAlthough commercial “isolation transformer” exist and are readily available, several surplus transformers in like-new condition were at hand. We can achieve the same effect by connecting two identical transformers back-to-back, to obtain 110 vac. Note that this reduces the overall current capability compared to ratings, and so some testing is needed to confirm how they will operate. Three transformer pairs were tested. Our goal is to charge the 12,000 TF capacitor in ten seconds or less. The photo shows one each of the transformers; an identical set of transformers are available but not shown. Each of the three transformer pairs were tested (see schematic and photo above) and their output measured. We recorded the voltage in loaded and unloaded conditions.
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Last Update 2008-06-05
©1998-2024 Barry Hansen |