Flyback transformer behave more like inductors. Try PSIM or some other software otherwise use couple inductor in Pspice that might be helpful for you. Whatever transformer you have used that will not work like flyback transformer in pspice. I have tried to simulate it in MatLab simulink and I get the same result.Ĭould you please help me figure out where the problem is and why I cannot get the 200VDC output? Right now I get 90 VDC regardless of whatever change I make I my circuit (changing the turn ratio, changing the input voltage) R2=42.7Ohm (R1 and R2 are supposed to be the winding resistance) The Transformer Parameters would be as followed: I am using the following parameters for the circuit: The circuit is supposed to convert a 3.7 VDC from a Battery to 200 VDC. I am not sure if the problem is from the transformer or the switching. I have a flyback converter which I cannot get the desired result from the simulation in Pspice. It would be better yet if they could specify the winding resistance directly for the windings but I don't know if their simulator has that provision available. It would be much better if the windings were split, and the resistance placed in between the windings. Above that, and it'll act like a clamp in the simulation.ģ) Although it won't impact the simulation much, the forward current limitations of the 1N914 would likely vaporize the junction during start-up in a real-world trial.Ĥ) The modeling of the winding resistance is poor.

At that point, the intrinsic body diode breaks down, and clamps the output.Ģ) The PIV of the 1N914 will be somewhere between 75v and 100v, depending on who designed the model. I recently tried using some models for ultrafast diodes to compare with the UPSC600 model the results weren't encouraging at all - the recovery time added a lot of inefficiency to the simulation, but it's probably a lot closer to reality.Īs I see it, the problems our OP is having with their simulation are:ġ) The Vdss rating of the IRF150 is only 100v.

There's a problem with using the UPSC600 model in LTSpice those SiC diodes have virtually zero recovery time, but MicroSemi has no documentation available that they ever made a diode of that part number.Įven fast-recovery or ultrafast diodes have a far greater recovery time than that SiC model.

Psim flyback converter