Inverters Are Classified According To Their Wave String Properties

There are mainly two types, one is sine wave inverters, and the other is square wave inverters.
The sine wave inverter outputs the same or even better sine wave AC power as the power grid we use daily, because it does not contain electromagnetic pollution in the power grid.
Sine wave inverter introduces the technology of sine wave inverter, explains the working principles of typical inverter methods in the development of sine wave inverter, and the working process of typical inverter circuits. The content includes: the basic form of the inverter main circuit, such as voltage and current mode [1]
The output of the square wave inverter is poor quality square wave AC power, and its maximum positive value to maximum negative value are almost generated simultaneously, which causes severe unstable effects on the load and the inverter itself. At the same time, its load capacity is poor, only 40-60% of the rated load, and cannot carry inductive loads. If the load carried is too large, the third harmonic component contained in the square wave current will increase the capacitive current flowing into the load, and in severe cases, it will damage the power filter capacitor of the load.
In response to the above shortcomings, quasi sine wave (also known as improved sine wave, modified sine wave, simulated sine wave, etc.) inverters have emerged. The output waveform has a time interval from the maximum positive value to the maximum negative value, which has improved the usage effect. However, the waveform of quasi sine wave is still composed of broken lines and belongs to the category of square wave, with poor continuity.
In summary, sine wave inverters provide high-quality AC power and can drive any type of load, but both technical requirements and costs are high. Quasi sine wave inverters can meet most of our electricity needs, with high efficiency, low noise, and moderate prices, making them the mainstream product in the market. The production of square wave inverters uses simple multi harmonic oscillators, which belong to the level of the 1950s and will gradually withdraw from the market.
Inverters are divided into coal based inverters, solar powered inverters, wind powered inverters, and nuclear powered inverters according to the different power sources. According to different purposes, it can be divided into independent control inverters and grid connected inverters.
In the world, solar inverters have higher efficiency in Europe and America, with a European standard of 97.2%, but their prices are relatively expensive. Other inverters in China have efficiency below 90%, but their prices are much cheaper than imported ones.
In addition to power and waveform, selecting the efficiency of the inverter is also very important. The higher the efficiency, the less energy is wasted on the inverter, and the more energy is used for electrical appliances, especially when using low-power systems.