Design, Analysis and Implementation of 550V Battery Charger with Changeover System

Abstract

Batteries are integral part of any industry where we require continuous supply of power irrespective of any situation; batteries are used as a back up. Chargers are used to charge the rechargeable batteries. Charging of battery is a complex process because of non-linear behavior of battery parameters. Chargers are used to charge the batteries by providing a regulated DC supply and controlled charging current as per the requirement. Battery charging not only depends on its voltage and current but also depends on various other parameters like state of charge and state of health. With the development of power electronics technology and digital signal processors, charging using devices like Thyristors, IGBTs and MOSFETs is implemented. Among these, thyristorized battery chargers are cheap, simple, reliable and available in high voltage and current ratings and hence, their use is a viable solution to the charging of lead acid battery applications.

This thesis demonstrates the different lead acid battery charging methods and amongst them the best suitable method for lead acid battery charging. An approximate battery model is required to get the exact charging behavior in the simulation, a battery model has been developed. Inverse cosine firing is used for rectifier as it is simple and takes less time to execute in the processor. PI controllers are used to control the voltage and current of the battery. The control strategy of battery charger is implemented using TMS320F2811 DSP Processor.