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What Is The Difference Between A Pure Sine Wave Inverter And A Modified Sine Wave Inverter?

Aug 08, 2020

What is the difference between a pure sine wave inverter and a modified sine wave inverter?

Inverters are mainly divided into sine wave inverters and square wave inverters according to the waveform.

      The square wave inverter outputs a square wave alternating current with poor quality, and its maximum value in the positive direction to the maximum value in the negative direction is generated almost simultaneously. This causes severe and unstable effects on the load and the inverter itself. Simultaneously,

Its load capacity is poor, only 40%-60% of the rated load, and it cannot carry inductive loads such as motors, washing machines, refrigerators, relays, and fluorescent lamps. If the load is too large, the square wave current will be

The contained third harmonic components will increase the capacitive current flowing into the load, and will damage the power filter capacitor of the load in severe cases. Aiming at the improvement of the above shortcomings, quasi-sine wave inverters have appeared in recent years, also known as

Modified sine wave inverter. Although its use effect has been improved, the waveform of the modified sine wave is still composed of polyline, which belongs to the category of square wave and has poor continuity.


   Pure sine wave inverters do not have the problem of electromagnetic pollution in the grid, and the output is the same or better sine wave AC power as the grid we use daily. In conclusion, pure sine wave inverter

Provides high-quality AC power, high efficiency, stable sine wave output, high-frequency technology, small size, light weight, and can drive any kind of load (including inductive loads such as TVs, LCDs, refrigerators, etc.) without interference (such as: Noise and TV noise). But the technical requirements and costs are relatively high.