How would I create a voltage doubler w/ an input of 120VAC (from standard wall outlet) to ~220VDC (at the maximum, 300VDC)?
This is to charge 4400uF 300VDC caps.
This is to charge 4400uF 300VDC caps.
Last edited:
Thanks! That makes sense (or at least my electrician friend said so =P).The best way to proceed would be with a 1:1 isolation transformer to safely isolate the charger from the line. When rectified and filtered, the voltage will be on the close order of 175. If you can find a transformer with an 80 volt secondary, you can operate it in reverse (apply 120 VAC to the 80 volt winding), and get 170 VAC out the primary side. That will rectify to 250 VDC.
Its either 2400uF/450VDC Cap or 4400uF/300VDC for the same price. Would it be worth it to risk 4400uF/300VDC w/ a 250VDC (basically a headroom of ~50V), or do a voltage doubler and get the 2400uF/450VDC?That would be unwise. You should always leave some voltage headroom in the capacitor charge. Going right to the limit leaves no margin of safety. Those caps are expensive to replace.
My friend explained that when we rectify something, it creates oscillations, and if it oscillates too high, it will fry the caps, too low, it will only charge to the minimum voltage and that this is a problem. How do we reduce the oscillation, or is he totally wrong?The best way to proceed would be with a 1:1 isolation transformer to safely isolate the charger from the line. When rectified and filtered, the voltage will be on the close order of 175. If you can find a transformer with an 80 volt secondary, you can operate it in reverse (apply 120 VAC to the 80 volt winding), and get 170 VAC out the primary side. That will rectify to 250 VDC.
He is totally wrong!My friend explained that when we rectify something, it creates oscillations, and if it oscillates too high, it will fry the caps, too low, it will only charge to the minimum voltage and that this is a problem. How do we reduce the oscillation, or is he totally wrong?
He says "I was using a resistor instead of a capacitor the WHOLE TIME!!!" (in a simulator)He is totally wrong!
Lefty
We'll be fine. First test run will be done in a controlled place w/ us behind a steel frame and using cameras to see.Be sure you count your fingers before and after. (This assumes you don't put your eye out, of course.)
by Aaron Carman
by Aaron Carman
by Aaron Carman
by Aaron Carman