Originally Posted by
CapnC
I'm looking at putting these two toroid transformers in parallel...
EBAY:
You are bidding on 2 new 800VA toroidal transformers. They are precisely made for high-end power amp or servo amp. They have very low power loss and magnetic leak. Labeled input 115 / 230 VAC 50/60 Hz (single coil with center tap) and outputs 40VAC x 2 (dual coils) and 15V x 2(Dual coils).
1. Primary I = 0.03A, Secondary V = 46.2VAC at 0.0A
2. Primary I = 1.75A, Secondary V = 45.3VAC at 4.5A
3. Primary I = 3.41A, Secondary V = 44.5VAC at 8.9A
4. Primary I = 5.02A, Secondary V = 42.9VAC at 12.9A
5. Primary I = 6.76A, Secondary V = 41.6VAC at 16.6A
I plan on hooking the two 40VAC from each transformer in parallel through one bridge rectifier and unwinding the two 15Vac to 4.5 Vac to use as 5v supply and run it through a separate bridge rectifier. I need help determining the size of the capacitor for the 40Vac (55.15 Vdc after rectification) and for the 4.5Vac (~5 Vdc after rectification)
I've gotten confused about determining the current from this figure 800VA - is it I = 800VA/Vac or 800VA/Vdc?
Any suggestions...Please
A couple of suggestions, if you parallel them up make sure they are both phased correctly when you hook them up, If you are removing windings from the 15v, hopefully they are on the outside (last winding) otherwise you would have to remove them all. Also the recommended calculation for VA and obtaining the total AC current is IAC=1.8*IDC.
Al
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.