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Inverters are mainly divided into two categories, one is a sine wave inverter, and the other is a square wave inverter.
The sine wave inverter outputs the same or better sine wave alternating current as of the grid we use every day because it does not have electromagnetic pollution in the grid.
The output of the square wave inverter is the square wave alternating current of poor quality, and its positive maximum value and negative maximum value are generated almost at the same time, thus causing severe instability to the load and the inverter itself. At the same time, its load capacity is poor, only 40-60% of the rated load, and it cannot carry an inductive load. If the load is too large, the third harmonic component contained in the square wave current will increase the capacitive current flowing into the load, which will damage the power supply filter capacitor of the load in severe cases.
In view of the above shortcomings, a quasi-sine wave (or modified sine wave, modified sine wave, analog sine wave, etc.) inverter has appeared, and its output waveform has a time interval from the positive maximum value to the negative maximum value. The use effect has been improved, but the waveform of the quasi-sine wave is still composed of broken lines, which belong to the category of square waves, and the continuity is not good.
In summary, sine wave inverters provide high-quality AC power and can drive any kind of load, but the technical requirements and costs are high. The quasi-sine wave inverter can meet most of our electricity needs, with high efficiency, low noise, and moderate price, so it has become a mainstream product in the market. The production of the square wave inverter adopts a simple multivibrator, and its technology belongs to the level of the 1950s and will gradually withdraw from the market.
According to the different power generation sources, inverters are divided into coal power inverters, solar inverters, wind power inverters, and nuclear power inverters. According to different uses, it is divided into independent control inverter and grid-connected inverter.
In addition to power and waveform, it is also very important to select the efficiency of the inverter. The higher the efficiency, the less power is wasted on the inverter, and the more power is used for electrical appliances, importance is more obvious, especially when using low-power systems.
