Why does the inverter rectify?

The fact is that there are frequency converters that do not require a rectifier unit, the so-called AC-AC frequency converter. However, the vast majority of the market is AC-DC-AC inverter, that is, it contains a rectifier unit, which is completely a pattern formed by technology and market competition to a certain extent, and the AC-DC inverter is produced at a lower price and is more reliable and mature to use, so everyone uses it. In fact, this is also in line with some laws of human scientific research.

For example, our voices are now digitized, turned into simple 0-1 codes, and then transmitted to distant places, and then turned into real sounds. Because simple things are easy to quantify and process, we all linearize complex curves, and then use linearized things to approximate and simulate complex practical links.

AC-DC-AC inverter, is to first turn the alternating current into DC, and then through the IGBT chopping method inverted into AC, chopping when processing the input DC is easier, because it is linear, from the perspective of calculus, as long as it is divided into many small enough squares, the cumulative effect is the same as the sine wave, and IGBT these devices, itself can only be turned on and off, so the signal of the processing block is more suitable.