In trying to simplify this design, does anyone see an issue with eliminating the isolation transformer and instead, driving the rectifier directly from the variac outputs ?
I know mains isolation would not be achieved, but other than that, are there any other issues ?
I added the new diagram.
I know mains isolation would not be achieved, but other than that, are there any other issues ?
I added the new diagram.
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There will be exactly 0V between your slider outputs no matter where you adjust the variac. you put them in parallel.
The DC voltage is only half of what you expected. It will not be balanced either
The DC voltage is only half of what you expected. It will not be balanced either
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If they were moving in the same direction there would be a near constant voltage of ½ Vmax on the bridged output.
That is why I emphasized that the sliders will be moving in opposite directions to create an increasing voltage.
Apart from that, if a GFCI is used, any dangers in not using an isolation transformer ?
Apart from that, if a GFCI is used, any dangers in not using an isolation transformer ?
Without the isolation transformer any grounded object can provide a path for current from either output. If you want to achieve a level of safety against electrocution when working on live equipment there is still a need for an isolation transformer.
when the sliders move opposite, on 0° and also at the end is full voltage, and in the middle half. Not useful either
