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According to the output waveform, the inverter is divided into pure sine wave inverter, modified sine wave inverter and square wave inverter. This article will briefly introduce these three types of inverters.

According to the output waveform, how many categories the inverter is divided?

  • Xindun
  • November 19, 2020

(1) Square wave inverter

Although the square wave inverter has the advantages of simple structure and low cost, it also has the disadvantages of low efficiency, high loss, large harmonic component and limited load. When load for power load with electric motor load or with transformer, because of its load saturation magnetic flux are designed according to the rising rate of sine wave, the square-wave rise too fast, resulting in its core saturation, the load will be starting difficulty, core overheating and making noises. Moreover, the efficiency of square wave inverter is much lower than that of correction wave and sine wave inverter, generally less than 60%.Because of the high cost of solar PVS, the advantage of solar PVS is that square wave inverters are rarely used in solar PVS. When load for power load with electric motor load or with transformer, because of its load saturation magnetic flux are designed according to the rising rate of sine wave, the square-wave rise too fast, resulting in its core saturation, the load will be starting difficulty, core overheating and making noises. Moreover, the efficiency of square wave inverter is much lower than that of correction wave and sine wave inverter, generally less than 60%. Because of the high cost of solar PVS, the advantage of solar PVS is that square wave inverters are rarely used in solar PVS.

(2) Modified wave inverter

Compared with square wave, the waveform of modified wave is improved obviously, and the high harmonic content is reduced. The traditional fixed wave inverter is through wave voltage for the ladder, as a result of the superposition exist this way control circuit is complex, superposition circuit used in the power switch tube is more, and the volume and weight of the inverter is larger, and many other problems. In recent years, with the rapid development of power electronics technology, PWM pulse width modulation (PWM) has been widely used to generate modified wave output. At present, the modified wave inverter has been widely used in remote areas of the user\'s system, because the user\'s system of power quality is not very high, and it can meet the needs of most of the electricity equipment, and there is 20% of the harmonic distortion, but it occurs in precision equipment operation problem, also can cause high frequency interference of communication equipment, so you must use the sine wave inverter at this time.


According to the output waveform, how many categories the inverter is divided?


(3) Pure sine wave inverter

It has the advantage of good output waveform, the distortion degree is low, and the output waveform and the utility grid of alternating current waveform, actually good sine wave inverter provides an alternating current is higher than the quality of the power grid. Sine wave inverter has little interference to radio and communication equipment and precision equipment, low noise, strong load adaptability, which can meet all applications of ac load, and high efficiency of the whole machine. Its disadvantage is that the circuit and the relative correction wave inverter are complex, high demand for control chip and maintenance technology, high price. In the application of solar power grid connection, sine wave inverter must be used to avoid power pollution to the public power grid.

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