Hello,
I am experimenting with a 300VA 117VAC/234VAC dual toroid power transformer. I have a bench setup with a 0 -130VAC 2000VA variac connected to the input of the transformer for slow ramp up. On the output side of the transformer I have a full bridge (diode) rectifier, 400uF capacitor, and a load resistor.
I am searching for a way to simulate the setup for varying input/output configurations such as the primary coils connected in series or parallel and similarly for the secondary being in series and parallel and combinations thereof for various load resistors and output capacitors. I would eventually like to collect data using a scope (voltage/current probe setup) etc... and compare/verify the collected test data against a model.
The bench setup works as expected for various input output configurations (2Vs or 0.5Vs outputs) and I seem to be getting a handle, at least in hardware, on how things work. However, I constructed a LTSpice model, without prior LTSpice knowledge, and I cant really seem to get the model to behave as expected. I used a fairly inexpensive LCR meter with 100Hz setting to measure coil inductance but with very little intuition what values should be expected albeit the values I am getting from measurement seem unreasonably large. Here is a screenshot of my LTSpice schematic and the inductance values are from measurement. I physically wired the primary coils in series and used the LCR meter across the outer leads and then the secondary in parallel and once again measured across the two leads and then just backed out the values by dividing by two considering L1+L2=Leq and 1/L1+1/L2=1/Leq etc...
I cant figure out where I am going wrong. Am I using the simulation tool incorrectly? Is it the wrong choice of simulation tool for this level of power application? Or have a taken poor test measurements?
Any guidance on this would be appreciated but I suspect at the very least I should be able to get the simulation to output 2Vs or 0.5Vs. I thought about lumping the coils as a single coil on each side but at this point I would like to understand what is wrong with my approach thus far.
Schematic:
Sample Sim Output
MStokowski - Thanks for all your help and inputs. You are correct regarding where to place "COM" or grounds in the schematic. Also, Fesz Electronics videos were great. My final schematic looks something like this and generally agrees with the bench hardware setup. 
