Analysis of Types of Inverters in Power Supply
The inverter consists of two parts: the main circuit and the control system. Inverters are widely used and have many types. The basic types are:
(1) According to the type of DC power supply, inverters can be classified into voltage-type inverters and current-type inverters. 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. Therefore, it is also referred to as a voltage source inverter VSI (Voltage Source Inveter); the current-type inverter circuit The input has a large inductance in series to form a smooth DC current source, and the inverter inverts the input DC current into an AC current output. Therefore, it is also referred to as a current source type inverter (CSI).
(2) According to the nature of the output AC voltage, can be divided into constant frequency and constant voltage sine wave inverter and square wave inverter, frequency conversion inverter, high frequency pulse voltage (current) inverter.
(3) According to the different inverter circuit structure, it can be divided into single-phase half-bridge, single-phase full-bridge, push-pull, three-phase bridge inverter.
(4) According to the different switching devices and their off (commutation) modes, they can be divided into self-closing converter inverters using fully-controlled switches and forced-off thyristor inverters using semi-controlled thyristor switches. Two types. Thyristor inverters can also use load side AC mains 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 polyphase. Most practical applications only use single-phase or three-phase. In the early days, high-power inverters used thyristor switching devices. Once turned on, the thyristors could not turn off themselves. Turning off thyristors requires a forced shutdown (commutation) circuit. Forced shutdown circuitry increases the weight, size and cost of the inverter, reducing reliability and limiting the switching frequency.
Today, most inverters use fully-controlled power semiconductor switching devices. Medium power inverter with IGBT, IGCT, high-power multi-purpose GTO, low-power PMOSFET.
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