Low Frequency VS High Frequency Pure Sine Wave Power Inverter

From the working principle, it is divided into low frequency inverter and high frequency power inverter:

Low frequency inverter: firstly, the DC power is inverted into low-voltage AC power at low frequency, and then boosted by a low frequency transformer into 120VAC or 220VAC, 50HZ or 60HZ AC power for the load.

The advantages of the low frequency inverter: simple structure, because there is a low frequency transformer between the inverter module and the load, the inverter is stable and reliable, with strong overload capacity, and the peak power can reach 3 times.

The disadvantages of the low frequency inverter: because of the low frequency transformer, its weight is very heavy, generally more than 5 times of high frequency inverter. Its efficiency is also very low, usually the conversion efficiency of a low frequency inverter is only between 60%-70%. The self-loss is very large. If your battery is not large enough, it will be quickly consumed when the inverter has no load. General low frequency inverter, according to the current technology, its power factor can only reach 0.8. This is why many low frequency inverters are marked as kva. 1000kva low frequency inverter with power factor 0.8, its largest output is only 800W.

The high frequency inverter first uses the high frequency DC to DC conversion technology to invert the low-voltage DC into high-frequency and low-voltage AC, than boost the voltage through the high frequency inverter, and then rectify it to 300V-400V through the rectifier filter circuit high-voltage DC, and finally through the inverter circuit to get 120VACor 230VAC, 50HZ or 60HZ AC for the load to use.

The advantages of high frequency inverter: Because the high frequency inverter uses a small and light-weight high-frequency magnetic core material, the power density of the circuit is increased. And the volume of high frequency transformer is smaller than that of the low frequency inverter., so it has the characteristics of light weight and high efficiency. Its conversion efficiency can reach more than 94% at 48VDC, the quiescent current of 120VAC or 230VAC 1000W is only 9.6W, which is very suitable for use in vehicles anf solar systems.

The disadvantages of high frequency inverter: because the circuit design of high frequency technology is used between the inverter module and the load, the peak power is only twice the rated power, so its impact resistance is worse than that of low frequency inverters. At present, CNBOU's BPlus series pure sine wave inverter has overcome this problem, and it is the only high frequency inverter with 3 time peak power on the market.

See more for Power Inverter Selection Guide 2021 >>
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