Recently I did a bit of research and I learned that most inverters use a high frequency switching system. This system from what I know produces several hundred volts which is rectified into dc. After that there is some kind of weird switching system which turns it into AC, which did get me thinking a little bit. How would someone build a switching system like that. I do know that there is no transformer involved and the circuit runs at mains voltage. So how could you make a sign-wave switched circuit like the ones in high power inverters, where you could change the frequency. Also is this even possible to actually do?