Module (also known as IGBT), fan (cooling fan), photocoupler (IGBT drive with).
Other components are rectifier bridge, voltage regulator diodes, drive resistors, power supply part of the switching tube power management chip.
Circuit boards and the main chip is basically dedicated to each manufacturer, bad only find a way to get from the manufacturer.
Modules are mainly Infineon, Fuji, Mitsubishi. Voltage level for 220V corresponds to 600V level, 380V corresponds to 1200V level, 690V corresponds to 1700V level. The current size depends on the power of the inverter, the module current generally needs to be more than 4 times the power of the inverter (380V level). You can Baidu Beijing Jingchuan Electronics, they have more parts, generally to the inverter manufacturers. (I am not advertising for him, I have nothing to do with them.)
Fans are everywhere, but the quality is very important, there are Jianzhun, Kaguo, Sanxie, three giant. Counterfeit ones are especially common.
Optocouplers have PC923, PC929, PC925, A3120, A316,M57926 and so on. Commonly used is PC923 + PC929, as well as A3120.
Rectifiers are generally IR (International Rectifier Corporation), the domestic Anshan Teled is also a very good quality.
Voltage regulator is generally Motorola's IN4745 (16V), IN4746 (18V) 0.5W, (drive circuit).
Driver resistor manufacturers are different, the size of the module is not the same there is a certain difference. This can be bought everywhere.
Power supply part of the switching tube K1317, power management chip UC3844.
Frequently bad place is also the module as well as the module's drive circuit.
You can also look for inverter and industrial control on QQ QQ group, selling parts of a lot of people.