A New Design of Lead-Acid Battery Charger Based on Non-Inverting Buck-Boost Converter for the Photovoltaic Application

This paper addresses the problem of batteries recharging in stand-alone photovoltaic systems, a new design has been presented based on a non-inverting voltage buck-boost converter and a two-stage control system, taking into account, the compensation of the temperature of a valve-regulated lead-acid battery. The new proposed structure of the battery charger, increase the lifetime and allows a complete recharging of the batteries. Moreover, the process of charging is possible without using the method of state of charge estimation of the lead acid batteries that can produce a dangerous charging process if the batteries state of charge did not estimated with a good precision. Thus, the battery charger proposed, is valid for several types of batteries (ex: acid lead, nickel cadmium, lithium ion) and for different voltage levels (ex: 12, 24, 48 V).