Off-grid intelligent photovoltaic controller

Abstract

The invention discloses an off-grid intelligent photovoltaic controller, which comprises a power board, a master control board, a communication monitoring board and a human-computer interaction board. An input filtering circuit is arranged on the power board, and a Buck chopper is connected between input and output circuits. A digital signal processor (DSP) master control circuit, a signal sampling and processing circuit and a storage battery temperature acquisition circuit are arranged on the master control board, wherein the signal sampling and processing circuit comprises a voltage sampling and processing circuit and a current sampling and processing circuit. A touch screen and an indicator lamp are arranged on the human-computer interaction board. The DSP master control circuit is connected with the voltage and current sampling and processing circuits respectively, connected with the Buck circuit by an enhanced pulse width modulator (ePWM) and simultaneously connected with the storage battery temperature acquisition circuit by a small payload interface adapter (SPIA). The off-grid intelligent photovoltaic controller has the advantages that: (1) due to the adoption of a digital control mode, the off-grid intelligent photovoltaic controller is easy to maintain and high in control accuracy and real-time performance, and software can be upgraded; (2) due to the adoption of intelligent charging management comprising the three stages of constant current charging, constant voltage charging and floating charging, a photovoltaic utilization rage is increased; (3) voltage reduction is realized by adopting the Buck circuit, so the volume and weight of the controller are greatly decreased; (4) the functions of running data detection, remote control and the like can be realized; and (5) a novel visual interface and a security key are adopted, and each electrical parameter of the controller in running is displayed by the thin film transistor (TFT) touch screen so as to achieve higher intuitiveness, and the parameters of the controller can be set and modified by the touch screen.

Description

Technical field [0001] The invention relates to the field of photovoltaic controllers, in particular to an off-grid intelligent photovoltaic controller. Background technique [0002] At present, most controllers use low-performance main control chips, and keyboard input is mostly used for human-computer interaction. Therefore, there are low output voltage accuracy, poor output waveform, low conversion efficiency, low system reliability, difficult debugging and maintenance, and easy components. Defects such as aging, susceptibility to temperature drift due to environmental influences, poor control system stability, high manufacturing costs, difficulty in product software upgrades, limited monitoring and communication functions, and poor safety and reliability, cannot meet the requirements of social development. Summary of the invention [0003] The technical task of the present invention is to provide an off-grid intelligent photovoltaic controller for the above-mentioned technical...

AI Technical Summary

Problems solved by technology

[0002] At present, most controllers use low-performance main control chips, and keyboard input is mostly used for human-computer interaction, so there are problems such as low output voltage accuracy, poor output waveform, low conversion efficiency, low system reliability, difficulty in debugging and maintenance, and easy access to components. Aging, easy to be affected by the environment, resulting in temperature drift, poor control system stability, high manufacturing costs, difficult product software upgrades, limited monitoring and communication functions, poor safety and reliability, etc., cannot meet the requirements of social development

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