Circuit preventing reverse connection and reverse charging of solar controller

Abstract

The invention relates to a circuit preventing reverse connection and reverse charging of a solar controller. The circuit is characterized in that the circuit comprises a MOS charging unit, a current detection unit, a solar voltage sampling unit, a cell voltage sampling unit, a MOS pipe driving unit and a single chip microcomputer control unit; an output terminal of the MOS charging unit is connected to a charging input terminal BAT of a cell; an input terminal of the current detection unit is connected to a charging current output terminal of the MOS charging unit and an output terminal is connected to a third input terminal of the single chip microcomputer control unit; an input terminal of the solar voltage sampling unit is connected to an output terminal PV of a solar cell and an output terminal is connected to a first input terminal of the single chip microcomputer control unit; an output terminal of the cell voltage sampling unit is connected to a second input terminal of the single chip microcomputer control unit; two output terminals of the single chip microcomputer control unit are connected to two input terminals of the MOS pipe driving unit; and an output terminal of the MOS pipe driving unit is connected to a control input terminal of the MOS charging unit. The circuit of the invention possesses advantages that detection and determination are accurate; power consumption is small and a service life of a product is long.

Description

technical field [0001] The invention relates to a protection circuit for a solar controller, in particular to a circuit for preventing reverse connection and reverse charging of a solar controller, and belongs to the technical field of solar controllers. Background technique [0002] At present, solar energy is the first choice for green, environmental protection and sustainable development in new energy sources. Photovoltaic power generation technology has attracted more and more attention from all countries in the world and has developed rapidly. The solar controller converts the electric energy converted by the solar cell into the optimal charging mode to realize the charging and discharging management of the storage battery. However, in the actual use process, often due to improper use by the operator, it is easy to have the reverse connection of the positive and negative poles of the solar battery at the input end. In this way, during the charging process, the solar bat...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the existing MOS tubes are connected in series to prevent reverse connection and reverse charging, which is difficult to sample the solar voltage, prone to misjudgment or failure to turn off, resulting in power loss, and to provide a solar controller that prevents reverse charging. Connection and reverse charge circuit

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