Hello,

I am making an inverter for vehicle, which transform 12VDC to 230VAC. I got a simulation model in LTspice but I do not really understand how the controlling works?
Can anyone tell me?
My prog below.
Thank you in advance!

 

I think you should start researching the basic functionality of an H Bridge before designing a vehicle inverter. Your simulation is the start of a H bridge simulation and if you don't yet have an understanding of that that you have no chance progressing with a full inverter.