Pure sine wave and Modified sine wave inverter

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We all knows there are two kinds power inverter in the market, pure sine wave inverter and Modified sine wave inverter. Then what is the difference between them?

Pure sine wave inverter

Pure sine wave inverters output the true sine wave AC power which is the same as the power grid we use every day since there is no electromagnetic pollution. Pure sine wave inverters, with high efficiency, stable sine wave output and high frequency technology, are suitable for all kinds of loads without harms, which can not only power any common electrical equipment, but also run the sensitive electronics or appliances like microwave, fridge, etc.

In summary, pure sine wave inverter provides high-quality AC power,and pure sine wave inverters have the highest conversion efficiency and the lowest loss, but they have higher technical requirements and costs much more than modified sine wave inverters.

Modified sine wave inverter

Modified sine wave inverters have a time interval between their output waveforms from maximum positive value to maximum negative value, which improves their use effect. However, the modified sine wave is still composed of broken lines, which belong to the category of square waves, with poor continuity and blind zones.

Modified sine wave inverters should avoid powering inductive load. The inductive load refers to the high-power electrical products produced by the principle of electromagnetic induction, such as motors, compressors, relays, fluorescent lamps and so on, which require a much larger start-up current (about 5-7 times) than the current required to maintain normal operation. For example, a refrigerator that consumes about 150 watts of power in normal operation can start up with a power of more than 1000 watts. In addition, since the inductive load will produce counter electromotive force voltage at the moment of power on or off, and the peak of this voltage is much larger than that of inverters, which can easily cause the instantaneous overload of inverters and affect the service life of inverters.

Post time: Mar-11-2022