Contents I. Introduction
The rising rate of consumption and cost of fossil fuel has turned the focus on usage of renewable energy and energy storage system gradually. It is a fact that new trend of using renewable energy source like solar PV is gaining popularity as a primary energy source particularly in remote autonomous areas. The performance and the availability of power electronics components, lead acid battery and solar PV panel have increased drastically over last decade. In many literatures, design of solar PV charger for lead acid battery was attempted. However, there are different problems associated with these designs. A resonant battery charger is designed by R. M. Lamaison et. all [1] suffers from more usage of reactive elements and electromagnetic interference(EMI) due to electric isolation. A PV solar charger is proposed by G. S. Huang et all [2] has more complex elements for many features of the charger like buffer circuit and auxiliary power circuit. Auxiliary solar PV charger with MPPT tracking to supply local load has limitation on power rating [3]. A soft switched fast battery charger is described by S. G. Abeyratne et all [6] works by controlling the length of triggering time with a pulse width modulating controller, the battery can be charged with pulse charging technique. However, due to simultaneously turn-on and turn-off, of the transistor will generate excess heat. A fully integrated solar battery charger, which works on a low power supply voltage in the 0.6V to 1.5V range, operates successfully with limited source voltage variation [8]. Lately some PV battery chargers are proposed which operates satisfactorily with increased cost [5], [7] & [9].
