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Pushpull Inverter Simulation

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sabu31

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Dear All,

I am not able to increase the secondary voltage of the push pull inverter circuit,despite increasing the inductance. What is the reason for this.

Also can you let me know the reason for the waveform changing from square wave to quasi square wave on loading.

pushpull.png
 

The LTspice simulator, I know, doesn't expect an electrically isolated circuit as the one on the secondary side. To simulate a circuit as yours, I had to also add a ground node on the secondary side, directly or via a certain element likely a resistor (perhaps having a rather very high resistance to emulate isolation approximately).
 
Hi,

for creating a transformer with non 1:1 ratio you need to tell the winding ratio. I can´t find this information in your schematic.

Never used it before. I recommend to read the ltwiki / your simulation software documentation.

Klaus
 

From the literal definition of the Gate signals it is not possible at a glance to determine if there is some issue regarding timming constraints ( ramp waveform, concurrent driving, etc... ); it is advisable to plot both gate signals aswell.
 
Winding ratio is clearly defined by inductance values. (n1:n2:n3 = 1:1:20).
Real parameters not modeled are winding resistance, leakage inductance and core saturation.
--- Updated ---

Transistor rdson is transformed to about 10 ohm secondary, respectively output voltage drops to 50% with assumed load, probably lower due to transformer impedance. In other words, the inverter is overloaded.
 
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