Other Classification Methods For Solar Inverters

1. Classified by the frequency of output AC energy, it can be divided into power frequency inverters, intermediate frequency inverters, and high-frequency inverters. An inverter with a frequency of 50-60Hz for power frequency inverters; The frequency of intermediate frequency inverters is generally 400Hz to over ten kHz; The frequency of high-frequency inverters is generally from over 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 multiphase inverter.
3. According to the direction of the output energy of the inverter, it can be divided into active inverters and passive inverters. Any inverter that transmits the electrical energy output from the inverter to the industrial power grid is called an active inverter; An inverter that outputs electrical energy to a certain electrical load is called a passive inverter.
4. According to the form of the main circuit of the inverter, it can be divided into single ended inverters, push pull inverters, half bridge inverters, and full bridge inverters.
5. According to the types of main switch devices in inverters, they can be divided into thyristor inverters, transistor inverters, field effect inverters, and insulated gate bipolar transistor (IGBT) inverters. It can also be classified into two categories: "semi controlled" inverters and "fully controlled" inverters. The former does not have the ability to self turn off, and the components lose control after conduction, so it is called a "semi controlled" ordinary thyristor, which belongs to this category; The latter, on the other hand, has the ability to self turn off, meaning that the conduction and turn off without devices can be controlled by the control electrode, hence it is called "fully controlled". Power field-effect transistors and insulated gate double weight transistors (IGBTs) all belong to this category.
6. According to DC power supply, it can be divided into voltage source inverter (VSI) and current source inverter (CSI). The former has a nearly constant DC voltage and an alternating square wave output voltage; In the latter, the DC current is nearly constant, and the transmission current is an alternating square wave.
7. According to the control method of inverters, they can be divided into frequency modulated (PFM) inverters and pulse width modulated (PWM) inverters.
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 commutation inverter and self commutation inverter.