1. According to the output AC power frequency classification, it can be divided into industrial frequency inverter, intermediate frequency inverter and high frequency inverter. Power frequency inverters are inverters with a frequency of 50 to 60 Hz; intermediate frequency inverters generally have a frequency of 400 Hz to more than ten kHz; high frequency inverters generally have a frequency of more than ten kHz to MHz.
2. According to the number of phases output by the inverter, it can be divided into single-phase inverter, three-phase inverter and multi-phase inverter.
3. According to the whereabouts of the inverter's output power, it can be divided into active inverters and passive inverters. An inverter that transmits the power output from the inverter to the industrial grid is called an active inverter; an inverter that outputs the power output from the inverter to a certain power load is called a passive inverter Device.
4. According to the form of the inverter's main circuit, it can be divided into single-ended inverters, push-pull inverters, half-bridge inverters and full-bridge inverters.
5. According to the type of the inverter's main switching device, it can be divided into thyristor inverters, transistor inverters, field effect inverters, and insulated gate bipolar transistor (IGBT) inverters. It can be summarized into two categories: "semi-controlled" inverter and "full-control" inverter. The former does not have self-shutdown capability, and the components lose control after they are turned on. Therefore, it is called a "semi-controlled" ordinary thyristor. Both on and off can be controlled by the control electrode, so it is called "full control type". Power field effect transistors and insulated gate double-weight transistors (IGBT) belong to this category.
6. According to DC power supply, it can be divided into voltage source inverter (VSI) and current source inverter (CSI). In the former, the DC voltage is nearly constant and the output voltage is an alternating square wave; in the latter, the DC current is nearly constant and the input current is an alternating square wave.
7. According to the inverter control mode, it can be divided into frequency modulation (PFM) inverter and pulse width modulation (PWM) inverter.
8. According to the working mode of the inverter switching circuit, it can be divided into resonant inverters, fixed-frequency hard-switching inverters and fixed-frequency soft-switching inverters.
9. According to the inverter commutation method, it can be divided into load commutated inverter and self-converted inverter.
