There are many kinds of inverters, which can be classified according to different methods.

  1. According to the frequency of inverter output AC energy, it can be divided into power frequency inverter, intermediate frequency inverter and high frequency inverter. The frequency of power frequency inverter is 50-60Hz; the frequency of intermediate frequency inverter is generally 400hz-10khz; the frequency of high frequency inverter is generally 10khz-mhz.

  2. According to the phase number of inverter output, it can be divided into single-phase inverter, three-phase inverter and multi-phase inverter.

  3. According to the direction of the output electric energy of the inverter, it can be divided into active inverter and passive inverter. The inverter that transmits the electric energy output by the inverter to the industrial power grid is called the active inverter; the inverter that transmits the electric energy output by the inverter to a certain electric load is called the passive inverter.

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

  5. According to the types of main switching devices of inverter, it can be divided into thyristor inverter, transistor inverter, field effect inverter and insulated gate bipolar transistor (IGBT) inverter, etc. It can also be divided into two categories: half control inverter and full control inverter. The former does not have the ability of self turning off, and the components lose the control function when they are turned on, so it is called "semi controlled" ordinary thyristor; the latter, with the ability of self turning off, that is, the on-off and on-off without components can be controlled by the control pole, so it is called "fully controlled", power field effect transistor and insulated gate double weight transistor (IGBT), etc. It belongs to this category.

  6. According to DC power supply, it can be divided into voltage source inverter (VSI) and current source inverter (CSI). For the former, the DC voltage is nearly constant and the output voltage is alternating square wave; for the latter, the DC current is nearly constant and the output current is alternating square wave.

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

  8. According to the inverter control mode, it can be divided into frequency modulation (PFM) inverter and pulse width modulation (PWM) inverter.

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

  10. It can be divided into load converter inverter and self converter inverter according to inverter converter mode.