Generally speaking, there are two main types of electronic transformers used in inverter power supply, such as booster transformer and isolation transformer. Because the input DC voltage is higher than the AC output voltage level, but the input source voltage provided by the solar panel is usually not so high, so the system has to use a booster transformer on the AC output side to increase the voltage.
At the same time, it is necessary to isolate the circuits on both sides of the transformer isolation, prevent the DC current to the AC side, improve the protection of the circuit, but also increase the user's security. The inverter power supply can be divided into frequency transformation and high frequency transformation according to the transformation mode. Power frequency transformation is the use of discrete devices or integrated blocks to generate 50Hz square wave signal, and then use this signal to promote the power switch tube, the use of frequency booster transformer to produce 220V alternating power. Due to the use of power frequency transformers, large size, bulky, high prices, is currently mainly used in large solar photovoltaic power stations. However, with the maturation of power MOSFET process and the improvement of the quality of magnetic materials, the high Frequency transformation inverter power supply will go to the market. High frequency Transformation Inverter power supply is through the high-frequency DC/DC transformation Technology, the first low voltage DC into high-frequency low-voltage AC, after the Pulse transformer booster and then rectifier into high-voltage DC.