It looks like this Delon circuit might be useful for feeding 240DC to a small VFD using 120VAC. http://en.wikipedia.org/wiki/File:Bridge_voltage_doubler.svg http://en.wikipedia.org/wiki/Voltage_doubler
The transformer in the schematic would be the pole transformer, so all that would be needed is a couple of big diodes and capacitors. I suspect one could run a 1HP three phase motor from a normal US wall outlet this way. A breaker and/or overload protection would be good to add too. There are three half bridges on a VFD three phase input, so feeding DC to two inputs would have forward current on the same two VFD diodes full time. Single phase 240VAC would have four diodes in play part time. I'm not sure if this would be a problem. Ahh, just found this: http://www.practicalmachinist.com/vb/transformers-phase-converters-vfd/voltage-doublers-diode-based-vfd-front-ends-102923/ Short URL: http://alturl.com/pfqqb http://www.voltagemultipliers.com/html/multipliers.html Looks like a step up transformer feeding AC might be preferred if one can find one cheap enough. How do the Solar inverters get away with switching the the inverter output load? -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Colocation vs. Managed Hosting A question and answer guide to determining the best fit for your organization - today and in the future. http://p.sf.net/sfu/internap-sfd2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
