Phase shift full bridge converter

[adam18]

Hi ,
Iam trying to do an open loop ,simulink simulation of a phase shift full bridge converter. i used an ideal transformer as a start .input is 160V and output required is 24V.iam providing the phase shift by manipulating the phase delay in pulse generators for providing gste pulse.The issue that iam getting is that i fixed the transformer turns ratio to be 5 which is a design requirement ,What ever change i manually provide to the phase shift it doesnt make any change in the output voltage.

 

[Orzel Bialy]

Hello adam18! In my opinion the phase delay time must be less than the pulse width, i.e. < 1/200e3 (sec)

 

[cupoftea]

Here is PSFB in LTspice....the kind of small scale time domain things that you speak of are not very well simulated by simulink i think?

 

[FvM]

What ever change i manually provide to the phase shift it doesnt make any change in the output voltage.

You are probably looking at the wrong measurement. +/- magnitude of the transformer output voltage isn't expected to change, voltage-time integral however does. In a typical PSFB application, transformer output is rectified and filtered by an inductor. Filtered DC is proportional to phase shift, also transformer output rms voltage.