Technical articles-Structural principle of inverter

by:V&T Technologies     2019-11-10
It can be simply said that the AC inverter needs to use too many components, which is not easy to control, and the components used in the AC and AC are few and the control is simple. Therefore, most of the inverters with the AC and AC structure are currently used. 1. The development of frequency converter also needs to go through a gradual process. The original frequency converter did not adopt this topology of AC to DC and then AC, but direct delivery, no intermediate DC link. This type of inverter is called AC Inverter. At present, this type of inverter is used in ultra-large power and low speed regulation. Its output frequency range is: 0-17 (1/2-1/3 input voltage frequency) Therefore, it could not meet the requirements of many applications, and there was no IGBT at the time, only SCR, so the application range was limited. The working principle of the AC inverter is to directly generate the required variable voltage inverter power supply through several sets of phase control switches. The advantage is that the efficiency is high and the energy can be easily returned to the power grid, its biggest disadvantage is that the highest output frequency must be less than 1/3 or 1/2 of the input power frequency, otherwise the output waveform is too poor and the motor will shake and cannot work. Therefore, the inverter has been limited to low-speed regulation, which greatly limits its scope of use.
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