Hello,
I am designing a full-bridge dc-dc converter. I need to get a Vout of around 180V. I am not getting a steady Vout from this design. Any help or advice?

 

Why do you have ground connected to the secondary of the transformer, instead of the bottom of the load?

 

Why do you have ground connected to the secondary of the transformer, instead of the bottom of the load?

I need a ground reference on the right hand side of the transformer. Floating circuits (with no DC path to ground) are not allowed.

 

Read once again what I wrote, connect the ground to the bottom of the load, not the transformer.

 

Are those temperature dependent FETs? If so replace with normal ones (for spice) and see if the results are better. Then we can try to go from there.
I think spice would be happy with meg-ohms to ground.

 

Are those temperature dependent FETs? If so replace with normal ones (for spice) and see if the results are better. Then we can try to go from there.
I think spice would be happy with meg-ohms to ground.

Thanks a lot.