Re: Dual transformer power supply build
You mean like this ? I believe you're suggesting to wire the outputs in series only when needed and leave them separate for two 48v outputs, as otherwise this setup would not allow me to have the two 48v outputs AND the 96v output simultaneously the way I pictured it. It COULD work at the same time, but common grounding would be impossible: touch the 96v GND (bottom) to the 48v GND (middle) and you short out D-F the way I see it...not that any device would ever require a 48v AND 96v input, but still better to prevent the average Joe form connecting the two GNDs together thinking they're common...
Not the most practical approach, since I'll have this inside a case and the 48v outputs will go straight to the input of the two DC-DC converters, however this does give me an idea for a switch/relay gizmo to toggle between the two "modes". I know, I know, mechanical switches+DC = bad idea (arcing), but I'll think of something nonetheless...I was already thinking of this with my previous 3-rectifier setup: when in "96v unregulated mode", a switch would cut two of the AC inputs going to the rectifiers on the right and leave only the end windings connected to the center rectifier (to prevent accidental connection of GNDs which is not possible). In DC-DC mode, the link between the taps would get cut and the two AC inputs would be restored...it was just an idea and haven't lain it on paper yet...contact acing would be the biggest issue, but I was already working around that with some sort of soft-start, which we'll discuss later perhaps...
You mean like this ? I believe you're suggesting to wire the outputs in series only when needed and leave them separate for two 48v outputs, as otherwise this setup would not allow me to have the two 48v outputs AND the 96v output simultaneously the way I pictured it. It COULD work at the same time, but common grounding would be impossible: touch the 96v GND (bottom) to the 48v GND (middle) and you short out D-F the way I see it...not that any device would ever require a 48v AND 96v input, but still better to prevent the average Joe form connecting the two GNDs together thinking they're common...
Not the most practical approach, since I'll have this inside a case and the 48v outputs will go straight to the input of the two DC-DC converters, however this does give me an idea for a switch/relay gizmo to toggle between the two "modes". I know, I know, mechanical switches+DC = bad idea (arcing), but I'll think of something nonetheless...I was already thinking of this with my previous 3-rectifier setup: when in "96v unregulated mode", a switch would cut two of the AC inputs going to the rectifiers on the right and leave only the end windings connected to the center rectifier (to prevent accidental connection of GNDs which is not possible). In DC-DC mode, the link between the taps would get cut and the two AC inputs would be restored...it was just an idea and haven't lain it on paper yet...contact acing would be the biggest issue, but I was already working around that with some sort of soft-start, which we'll discuss later perhaps...
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