Smart fuzzy-based energy-saving photovoltaic burp charging

This paper focuses on the optimal usage of photovoltaic energy by implementing 'pulse charging' technique to charge batteries and to keep the supply from the solar panel continuously without any interruption. The burp-pulse charging technique is used to supply multiple loads. Three different batteries Bp, Ba1 and Ba2 are smart charged concurrently and individually during three kinds of charge statuses controlled by a charge regulation system. The high-frequency input pulses are obtained from an interleaved flyback converter. The charge for prime battery (Bp) is from the positive pulse and that for auxiliary battery-1 (Ba1) is from the break period between the pulses. Finally the third battery, that is, auxiliary battery-2 (Ba2) is incorporated to utilise the negative pulse charge through an inductor when the step-up chopper is closed. This can otherwise be put as, utilising the discharge current of Bp to supply a load. The Ba2 voltage is stepped up to supply a motor load when supply from prime battery Bp is unavailable. The closed loop simulation introduces a fuzzy logic controller which controls the generation of pulses according to the variations in the input source voltage. By this way, a linear and smoother current is available to charge the batteries. Thus, the energy-saving concept is fulfilled by the proposed design. Faster and uninterrupted charging and better battery life are other facets of the proposed system. The closed loop simulation is performed and results are presented.