Square wave inverters and inverter ladder

Press the 4000w inverter charger output voltage or current waveform can be divided into:
(1) The square wave inverter
Voltage waveform square wave inverter output is a square wave inverter circuit such inverter used are not identical, but the common feature is the circuit is relatively simple, small amount of power used by the switch. Design of power is generally between one hundred watts to kilowatts.
Square wave inverter advantages are: line, easy maintenance, low price.
The disadvantage is that the square wave voltage contains a large number of high-order harmonics generated additional losses in the electrical load with core inductor or transformer in on the radio and some communication equipment interference. In addition, these 500w charge inverter also pressure range is not wide enough, the protection function is not perfect, the noise is relatively large shortcomings.
(2) step wave inverter
Such inverter output voltage waveform is a stepped wave. Inverters achieve stair-step output also has a variety of different lines. The number of stairs output waveform varies greatly.
Advantages step wave inverters are: wave output waveform example, a significant improvement in reducing high harmonic content, when the ladder to reach 17 or more quasi-sine wave output waveform can be achieved, when using transformerless output high overall efficiency .
The disadvantage is that the ladder wave superimposed line use more power switches, which form some lines also require multiple sets of DC power input. This gives the PV array wiring and balanced grouping and rechargeable battery are in trouble. Further staircase voltage radio communications equipment and some are still some high-frequency interference.