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Working principle: The core of the inverter device is the inverter switching circuit, which is simply referred to as the inverter circuit. The circuit completes the function of the inverter by turning on and off the power electronic switch.
(1) requires high efficiency.
Due to the current high price of solar cells, in order to maximize the use of solar cells and improve system efficiency, it is necessary to improve the efficiency of the inverter.
(2) Requires high reliability.
At present, the photovoltaic power station system is mainly used in remote areas, and many power stations are unattended and maintained. This requires the inverter to have a reasonable circuit structure, strict component screening, and requires the inverter to have various protection functions, such as: input DC polarity reverse protection, AC output short circuit protection, overheating, overload protection, etc.
(3) The input voltage is required to have a wide adaptation range.
Since the terminal voltage of the solar cell varies with the load and the intensity of the sunlight. Especially when the battery is aging, its terminal voltage varies widely. For example, for a 12V battery, the terminal voltage may vary between 10V and 16V, which requires the inverter to work normally in a large DC input voltage range