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Abstract
This paper analyzes the principle of boundary mode flyback topology, presents a five-output auxiliary power supply of 3KW solar power inverter without the optocoupler feedback regulator circuit. The circuit has the characteristics of a simple structure, low cost, high efficiency and high reliability . The multi-output auxiliary power supply of the PV inverter schematic and a high frequency flyback transformer detail design are given. This power supply has been already used in an inverter. The experiment results prove that the auxiliary power supply has a stable work state, a low output ripple, a transformer without fever phenomenon, and meet the requirements of Solar power inverters.
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