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What are the main classifications of inverters?

Jan 16, 2019

There are two main types, one is sine wave inverter, the other is square wave inverter.

Sine-wave inverters output the same or better ac power as the grid we use every day, because there is no electromagnetic pollution in the grid.

Square wave inverter output is the quality of the poor square wave alternating current, its positive maximum to negative maximum almost at the same time, so, on the load and the inverter itself caused severe instability. At the same time, the load capacity is poor, only 40-60% of the rated load, not with the inductive load. If the load is too large, the cubic harmonic component contained in the square wave current will increase the capacitive current flowing into the load and seriously damage the power filter capacitance of the load.

According to the above shortcomings, a quasi sine wave (or modified sine wave, modified sine wave and sine wave simulation, etc.) inverter, the output waveform from a positive to a negative maximum value has a maximum time interval, use effect is improved, but quasi sinusoidal waveform is still composed of line, belong to the category of square wave, continuity is bad.

In summary, sine-wave inverters provide high quality alternating current and can drive any kind of load, but the technical requirements and costs are high. Quasi-sinusoidal inverter can meet most of our electricity demand, high efficiency, low noise, moderate price, so it has become the mainstream product in the market. The square wave inverter is made of simple multivibrator, the technology of which belongs to the level of 1950s, and will be gradually withdrawn from the market.

The inverter is divided into coal power inverter, solar energy inverter, wind energy inverter and nuclear energy inverter according to the different power supply. According to different purposes, divided into independent control inverter, grid-connected inverter.

The world's solar inverter, Europe and the United States high efficiency, the European standard is 97.2%, but the price is expensive, other domestic inverter efficiency are below 90%, but the price is much cheaper than the import.

In addition to power and waveform, it is also very important to select the efficiency of the inverter. The higher the efficiency, the less electric energy will be wasted on the inverter and more electric energy will be used for electrical appliances, especially when you use a low-power system.