Photovoltaic controller with maximum power point tracking function

Abstract

The invention discloses a photovoltaic controller with a maximum power point tracking function. The photovoltaic controller comprises a singlechip control circuit, an output current acquisition circuit, an output voltage acquisition circuit, a temperature acquisition circuit, a photocurrent detection circuit, a switching power circuit and a load impedance regulation circuit, and is characterized in that: the singlechip control circuit receives signals from the output current acquisition circuit, the output voltage acquisition circuit, the temperature acquisition circuit and the photocurrent detection circuit, processes and calculates the signals and outputs the signals to the load impedance regulation circuit and the switching power circuit; the output current acquisition circuit acquires load current, processes the load current and outputs the signals to the singlechip control circuit; the output voltage acquisition circuit acquires load voltage, processes the load voltage and outputs the signals to the singlechip control circuit; and the temperature acquisition circuit acquires the temperature of a solar cell, processes the temperature and outputs the signals to the singlechip control circuit. The photovoltaic controller can be widely applied in the field of solar control.

Description

technical field [0001] The invention relates to a photovoltaic controller, in particular to a photovoltaic controller with maximum power tracking. Background technique [0002] The output power of solar cells is not stable, but is affected by temperature and light. When the temperature increases by 1°C, the voltage of each solar cell decreases by about 2mV; while the photocurrent increases slightly with the increase of temperature, and the photocurrent of each solar cell increases by 1‰ for each increase of 1°C, but the total In terms of power drop, that is, every time the solar cell rises by 1°C, the power will decrease by 0.35%. MPPT maximum power tracking photovoltaic controller is a controller that adjusts its output voltage by changing the duty cycle of the switching power supply waveform, and supplies the electric energy generated by the solar photovoltaic cell to the load in the form of maximum power. Due to the matching problem of different loads, generally spe...

AI Technical Summary

Problems solved by technology

Due to the matching problem of different loads, generally speaking, capacitive loads and active loads will be able to match better, but for resistive loads, the matching problem will be more difficult, which will inevitably cause a wide range of switching power supply waveform duty ratios. Variety

Since the switching power supply has no current output within a certain period of time, it is inevitable that the transient power will be zero, and the maximum power output requirement cannot actually be achieved.

Images