PROJECTS & SOLUTIONS
Advantages and Disadvantages of Different Output Waveforms of Inverter
Delease Date:2022-05-17

1. Square wave inverter


The AC voltage waveform output by the square wave inverter is a square wave. The inverter circuits used by this type of inverter are not exactly the same, but the common feature is that the circuit is relatively simple, the number of power switch tubes used is small, and the design power Generally between 100 watts to kW. The advantages of square wave inverter are simple circuit, low price and convenient maintenance. The disadvantage is that because the square wave voltage contains a large number of high-order harmonics, additional losses will be generated in the load electrical appliances with iron core inductance or transformer, which will interfere with the radio and some communication equipment. In addition, this type of inverter also has shortcomings such as insufficient voltage regulation range, insufficient protection function, and relatively large noise.


2. Staircase wave inverter


The AC voltage waveform output by this type of inverter is a staircase wave, and there are many different circuits for the inverter to realize the staircase wave output, and the number of steps of the output waveform varies greatly. The advantage of the ladder wave inverter is that the output waveform is significantly improved compared with the square wave, and the high-order harmonic content is reduced. When the ladder reaches more than 17, the output waveform can achieve a quasi-sine wave. When using the transformer less output, the whole machine is very efficient. The disadvantage is that there are many power switch tubes used in the step wave superposition line, and some of the line forms also require multiple sets of DC power input, which brings trouble to the grouping and wiring of the solar cell array and the balanced charging of the battery. In addition, the step wave voltage still has some high frequency interference to radios and some communication equipment.


3. Sine wave inverter


The AC voltage waveform output by the sine wave inverter is a sine wave. The advantages of the sine wave inverter are that the output waveform is good, the distortion is very low, the interference to the radio and communication equipment is small, and the noise is low. In addition, the sine wave inverter has complete protection functions and high overall efficiency. The disadvantage is that the line is relatively complex, the maintenance technology is required to be high, and the price is relatively expensive.


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