The inverter consists of two parts: the main circuit and the control system. Inverters are widely used and come in many types. Its basic types are
(1) According to the type of DC power supply, the inverter can be divided into a voltage type inverter and a current type inverter. The input of the voltage type inverter circuit is a DC voltage source, and the inverter inverts the input DC voltage to output an AC voltage, so it is also called a voltage source inverter VSI (Volage Source Inveter); the current type inverter circuit The input terminal is connected in series with a large inductance to form a smooth DC current source. The inverter inverts the input DC current into an AC current output, so it is also called a current source inverter CSI (Curent Source Invete).
(2) According to the nature of the output AC voltage, it can be divided into constant frequency constant voltage sine wave inverter and square wave inverter, frequency conversion transformer inverter, high frequency pulse voltage (current) inverter.
(3) According to the structure of the inverter circuit, it can be divided into single-phase half-bridge, single-phase full-bridge, push-pull, and three-phase bridge inverter.
(4) According to the switching device and its turn-off (commutation) mode, it can be divided into self-shutdown converter inverter with full-control switch and forced-off thyristor inverter with thyristor half-control switch. Two types. Thyristor inverters can also utilize load side AC supply voltage commutation (also known as active inverters), load back EMF commutation or load resonant commutation. The output of the inverter can be made into any multiphase. Most of the practical applications use only single phase or three phase. In the early stage, the medium and high power inverters used thyristor switching devices. Once the thyristors were turned on, they could not be turned off by themselves. To turn off the thyristors, a forced turn-off (commutation) circuit was required. Forced shutdown circuitry increases the weight, size, and cost of the inverter, reducing reliability and limiting switching frequency.
Today, most inverters use fully controlled power semiconductor switching devices. Medium power inverters use IGBT, IGCT, high power multi-purpose GTO, and low power use PMOSFET.
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