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Inverter classification

2017-11-02

In the use of solar energy storage battery solar PVS, the battery nominal voltage is generally 12V, 24V or 48V, therefore, the inverter circuit generally need to boost to meet the 220V common AC load demand. Inverter can be divided according to the principle of boosting power frequency and high frequency two inverters, the application of their performance vary widely.

(1) frequency inverter:Figure 1 shows the use of frequency transformers boost the inverter circuit. It is the first inverter into the frequency of low-voltage alternating current; and then through the frequency transformer boost to 220V, 50Hz AC for the load to use. Its advantages are simple structure, a variety of protection functions can be achieved at lower voltage. Because of its inverter power supply and load between the power frequency transformer, so the inverter is stable, reliable, overload capacity and impact resistance, and can inhibit the waveform of the harmonic components. However, the frequency transformer is also cumbersome and high price problems, and its efficiency is relatively low. According to the current level of production of small frequency inverter, the rated load efficiency is generally not more than 90%, while the power frequency transformer at full load and light load when the iron loss is basically the same, so that it is running under light load Of the no-load loss is large, the efficiency is also low.

(2) high frequency inverter:Figure 2 shows the use of high-frequency transformer boost inverter circuit. It is first through the high-frequency DC / DC conversion technology, low-voltage direct current into high-frequency low-voltage alternating current; and then after the high-frequency transformer boost, and then through the high-frequency rectifier filter circuit is usually more than 300V high-voltage direct current; Through the frequency inverter circuit to get 220V frequency AC power supply for use. As the high-frequency inverter uses a small size, light weight of the high-frequency core material, which greatly improved the power density of the circuit, so that the inverter power supply load loss is small, the inverter efficiency is improved. Usually, for high-frequency inverter in small and medium-sized PVS, the peak conversion efficiency can reach more than 90%.

Compared with the two inverters, the high-frequency inverter is small in size, light in weight, high in efficiency, low in load, but can not reach the inductive load at full load, and the overload capacity is poor.


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