Abstract: In order to solve the problem of multi-stage conversion efficiency loss of traditional photovoltaic system and improve the load cooperation ability of photovoltaic and inverter, this paper proposes a inverter power supply system scheme and device based on photovoltaic straight generation and direct use. The device adopts a three-channel interleaved parallel Boost topology, and designs a double closed-loop control architecture of voltage outer loop and current inner loop and a multi-mode adaptive control strategy. Integrated MPPT, voltage regulation current limit and multiple protection functions in one, with DC network type ability, can autonomously stabilize the DC bus voltage; At the same time, it can switch between photovoltaic priority power supply and stable operation modes according to the light conditions and load conditions. Through experimental verification, it is proved that the effectiveness and reliability of the device can significantly improve the efficiency of the system, reduce the electricity cost of industrial users, and have good engineering application value.