PSIM PWM Control for resonant inverter

[user92]

Hi all,

I have been stuck on this for a while and would be grateful if anyone can give some help.

I am modeling a half bridge resonant inverter in PSIM and my issue is with the Bi-polar PWM control. I can not figure out how to introduce a dead time between two switches operating.

Anyone have any pointers? I see there is other two PWM blocks but I am finding it difficult to get it to work correctly. I looked at the examples and they are full bridge so its somewhat different.

Thanks

 

[BradtheRad]

The resonant action makes it feasible for a comparator (or op amp) to be triggered on-and-off.

Oscillations start reliably from powerup. Caveat, it's a simulation. It's untested.



The op amp is an ideal model, not real. In a real circuit it will require several components to do what it does.

Not sure about dead time. Perhaps this could be done with 2 op amps. Reference voltages could be applied to the inputs, and adjusted to turn off both transistors for a desired time.

 

[zizi110]

Hi user92,
i think you can write a C code for your controller and insert a delay in your code for dead time purposes.
you can use digital controller block in psim,