Hello,
I have push-pull DC-DC converter for my graduation project consisting solar panel as source. I am in simulation part but had a difficulty about transformer leakage inductance effect of my circuit.
I am using Simulink and simscape library components(blue ones). In real experiment i will use RM14 core with N87 material and according AL value of this material and calculations about turn number etc i modeled the transformer. I am using "primary" and "secondary" winding blocks for it.
The problem is when model the transformer with no leakage inductance there is no problem obviously however, when i add leakage inductance( Lm=600uH so i put leakage inductance for 6 uH) there is a huge voltage drop in transformer and load. So as power of course. The output current drop is 20mA(nominal Io=0.75A) but there is 20V of voltage drop.
I designed a lossless snubber circuit but it helped but not that much and i designed it with no mathematical aspects just with trying in Simulink.
So i know leakage inductance effect on spike voltages on mosfets but, Does it effect efficiency this much or does Simulink misleading me?
And is there a solution for this?
Mohamed Azab So you mean that I should model the transformer with ideal transformer and parallel connected inductance right?
In the picture the transformer has leakage inductance inside the "primary winding" block but series connected with winding resistance.
I am asking to make clear.
If I understand correctly is your way of modelling more accurate to the real?
I would have thought, because the current flows through both the leakage inductance and the ideal transformer, it would be more realistic to put them in series.
- Badges
- Science topic