(I am a big newbie when it comes to electrical circuits) So I am searching the Internet for how the Solar inverters work. Most schemes that I come across have an H-bridge with some sort of transistors. Now how I understand the transistors are controlled by an oscillator and bridge itself then converts DC current to AC current (though a square wave one). Is this correct so far? Also, how do they get a pure sine wave from a square wave? By using inductors?