Generally, the process of converting alternating current energy into direct current energy is called rectifier, the circuit that completes the rectifier function is called rectifier, and the device that realizes the rectifier process is called rectifier or rectifier. Correspondingly, the process of converting DC power to AC power is called inverter, the circuit that completes the inverter function is called inverter, and the device that realizes the inverter process is called inverter or inverter.

  Modern inverter technology is a science and technology to study the theory and application of inverter circuit. It is a practical technology based on industrial electronic technology, semiconductor device technology, modern control technology, modern power electronic technology, semiconductor converter technology, pulse width modulation (PWM) technology and other disciplines. It mainly includes three parts: semiconductor power integrated device and its application, inverter circuit and inverter control technology.