Using the principle of the oscillator, the direct current is first changed into pulse alternating current whose size changes with time. The DC component is removed through the DC isolation system and the alternating component is retained, and then passed through the conversion system (boost or step-down). By transforming, shaping and stabilizing the voltage, we get the alternating current that meets our needs.

The inverter consists of many parts, the core part of which is the oscillator. The earliest oscillators were electromagnetic, and later developed into electronics. From discrete components to application-specific integrated circuits, and then to microcomputer control, they became more and more perfect. The functions of inverters became stronger and stronger, and they were used in various fields. has a wide range of applications.