Over-current protection and startup recovery circuit for solar photovoltaic controller

Abstract

The invention provides an over-current protection and startup recovery circuit for a solar photovoltaic controller. According to the technical scheme adopted for the circuit, a current sampling resistor is connected to a discharging circuit for a load of a storage battery in series, a same-phase proportional amplifying circuit composed of an operational amplifier and a plurality of resistors is adopted to amplify a voltage signal on the sampling resistor, then the voltage signal is sent to a voltage comparer composed of an operational amplifier and a plurality of resistors for comparison and high and low level output, and the voltage comparer is connected with the control end of a drive control circuit to control on and off of a switch tube. In addition, a recovery control circuit is arranged at the same-phase input end of the operational amplifier of the voltage comparer of the circuit so that intelligent recovery control can be performed through an I / O port of a single chip microcomputer. A state monitoring circuit is arranged at the output end of the voltage comparer. By means of the circuit design, the working stability and the capacity of automatically resuming work after breakdown of the solar photovoltaic controller are improved.

Description

technical field [0001] The invention relates to solar photovoltaic controller technology, in particular to an overcurrent protection and start-up recovery circuit for a solar photovoltaic controller. Background technique [0002] The solar photovoltaic controller is the core component of the solar photovoltaic power generation system and is widely used. Due to the complexity of the application environment of the solar photovoltaic controller, it is often attacked by sand, dust or rain, which makes it easy to short-circuit the load input terminal or the discharge line, and the sudden excessive discharge current of the battery. A fuse is connected in series. If the discharge current of the battery exceeds the rated current of the fuse, the fuse will be disconnected, and the battery will no longer discharge the load. Although the solar photovoltaic controller is effectively protected, the load cannot work normally. In order to restore the solar photovoltaic controller to work...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the defect that the traditional solar photovoltaic controller cannot automatically resume work after overcurrent protection, the present invention provides an overcurrent protection and startup recovery circuit for a solar photovoltaic controller, which has the function of overcurrent protection, monitoring the status of overcurrent protection and intelligent startup recovery function

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