First, according to the frequency of the inverter output AC energy, it can be divided into power frequency inverter, intermediate frequency inverter and high frequency inverter. The frequency of the industrial frequency inverter is 50~60Hz; the frequency of the intermediate frequency inverter is generally 400Hz to more than ten kHz; the frequency of the high frequency inverter is generally more than ten kHz to MHz.

Second, according to the number of phases of the inverter output, can be divided into single-phase inverter, three-phase inverter and multi-phase inverter.

Third, according to the direction of the output power of the inverter, it can be divided into active inverter and passive inverter. The inverter that transmits the electric energy output from the inverter to the industrial power grid is called an active inverter; any inverter that outputs the electric energy output from the inverter to a certain electric load is called a passive inverter. Device.

Fourth, according to the form of the main circuit of the inverter, it can be divided into single-ended inverter, push-pull inverter, half-bridge inverter and full-bridge inverter.

5. According to the type of the main switch device of the inverter, it can be divided into a thyristor inverter, a transistor inverter, a field effect inverter and an insulated gate bipolar transistor (IGBT) inverter. It can be classified into two categories: "half-controlled" inverter and "full control" inverter. The former, does not have the ability to self-shutdown, the components lose control after being turned on, so it is called "semi-controlled" ordinary crystal
The thyristor belongs to this category; the latter has self-shutdown capability, that is, the conduction and shutdown of no device can be controlled by the control pole, so it is called "full control type", power field effect transistor and insulation. Gate double-weight transistors (IGBTs) and the like belong to this category.

6. According to the 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; the latter, the DC current is nearly constant, and the input current is an alternating square wave.

7. According to the waveform of the output voltage or current of the inverter, it can be divided into a sine wave output inverter and a non-sine wave output inverter.

Eight, according to the inverter control method, can be divided into frequency modulation (PFM) inverter and pulse width (PWM) inverter.

IX. According to the working mode of the inverter switching circuit, it can be divided into resonant inverter, fixed frequency hard switching inverter and fixed frequency soft switching inverter.

10. According to the inverter commutation method, it can be divided into load commutating inverter and self-commutated inverter.