Wide-range low-input voltage ripple maximum-power tracking circuit for solar powered auto

Abstract

The invention provides a wide-range low-input voltage ripple maximum-power tracking circuit for a solar powered auto. The circuit is that input / output positive electrodes A and B are respectively connected with input end of a voltage-stabilizing chip 7805, and the input voltage is the open circuit voltage of a solar cell module when the circuit is started; when the voltage-stabilized chip is started, the voltage at the capacitor C1 end is increased to be Vin / (1-D) and is more than the input voltage; the power is supplied to the input end of the voltage-stabilized chip through a conductive diode Db, and a diode Da is stopped synchronously; the voltage drop of an inductor is equal to the voltage drop of the input voltage under the interval of t=[0-dTs]; the voltage drop of the inductor is equal to negative output voltage at the interval of t=[dTs-Ts]. The circuit has the beneficial effects that the input / output current is in continuous state, so that the requirement of impact current inputted in the traditional Buck-Boost on large input capacitance can be effectively met; the input capacitor is replaced by a film capacitor which is relatively long in service life and relatively small in capacitance, and therefore, the service life of a system is greatly prolonged, the maintenance cost is reduced, and meanwhile, the maximum-power tracking precision is improved.

Description

Technical field [0001] The invention relates to a buck-boost circuit, and relates to a wide-range low-input voltage ripple maximum power tracking circuit for solar vehicles. Background technique [0002] In the field of new energy research, a wide-range solar maximum power tracker can effectively maintain the maximum power tracking (MPPT) of solar panels under various conditions of illumination and temperature range changes. [0003] For example, solar electric vehicles, due to the uneven surface of the vehicle body, cause most of the solar cell modules to be in different light conditions, and an independent low-power solar tracking circuit is required to extract energy independently from different battery modules to maximize Use the limited surface of the car body to fully convert the absorbed solar energy. At the same time, the obvious difference in the intensity of sunlight during the day and the temperature difference throughout the year will cause a wide range of changes in t...

AI Technical Summary

Problems solved by technology

Due to the low service life of electrolytic capacitors, the service life of the maximum power tracking system is limited, the maintenance cost is increased, and the volume is increased

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