Регулювальні характеристики зарядного пристрою акумулятора від сонячної батареї

Larysa Mykolayivna Batrak; Volodymyr Yakovich Romashko

doi:10.20535/2523-4455.2019.24.4.185524

Vol. 24 · Issue 4 · 2019 Aug 30, 2019 Electronic Systems and Signals

Regulatory Features of Solar Battery Charger

Larysa Mykolayivna Batrak Corresponding Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського» Ukraine

Volodymyr Yakovich Romashko Національний технічний університет України «Київський політехнічний інститут імені Ігоря Сікорського» Ukraine

Pages25-31 PublishedAug 30, 2019

PDF (Ukrainian)

VOL 24 · ISS 4 · 2019 View issue

Abstract

The aim of the work is the analyze the of regulation characteristics of a switching voltage regulator of the step-up type. The case when the regulator's power source is a solar battery and the load is a rechargeable battery is considered. It is noted that in this mode, the switching voltage regulator operates in the mode of regulation of the output current (battery charging current). The case when the battery voltage is equal to the maximum no-load voltage of the solar battery is analyzed. It is shown that in this case regulation characteristic of the input current of the switching regulator coincide with the output characteristics of the solar battery, in which the axis of voltage is replaced by the axis of the relative open-time of the key of the switching regulator. Taking into account the received input regulation characteristics, the output regulation characteristics of the switching regulation were built. If the battery voltage is less than the maximum no-load voltage of the solar battery, the regulation characteristics of the switching regulation will coincide with a limited section of the output characteristics of the solar battery. In this case, the correspondence between the voltage scale and the scale of the relative open time of the key of the switching regulator will depend on the ratio between the battery voltage and the maximum no-load voltage of the solar battery. The conditions, under which the maximum amount of electrical energy will be obtain from the solar battery at different levels of illumination were analyzed. The condition, under which the inductance of the switching regulator will receive a discontinuous current mode were analyzed. For different levels of illumination of the solar battery, as well as depending on the magnitude of the inductance, the critical value of the relative open-time time of the key of the switching regulator, at which a discontinuous current mode occurs in the inductance were determined. Taking into account the possibility of the occurrence of such a mode, the adjustment of the previously obtained regulation characteristics were carried out. The normalized graphs of the regulation characteristics for the input and output current of the switching regulator, taking into account the possibility of the occurrence of a discontinuous current inductance in it are given. Recommendations on the expediency of using various sections of these characteristics, when charging batteries from a solar battery, are given. The dependence of the amount of under-received electrical energy from the solar battery, which is related to the pulsating nature of the input current of the switching regulator and the selected battery voltage value is analyzed. Recommendations regarding the choice of the battery voltage for a solar cell of the selected type are given.

Keywords

#switching regulator #solar battery #rechargeable battery #regulation characteristic #maximum power take-off #intermittent current mode

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