Development of a grid connected lead-acid battery charger

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Futó András
Department of Automation and Applied Informatics

The goal of my thesis is designing, building, programming and starting a battery charger, that can be used on leaded batteries found in cars. The charger is connected to 230V single phase power line. It charges batteries with 12V nominal voltage, with the energy taken from the power line.

After a short introductory, I wire about the leaded-acid batteries. I present their operating principle, structure, with showing their weaknesses and strengths.

In the second chapter I introduce the battery charger architecture. After the specification I study the requirements toward line friendly power supplies. Knowing the requirements I design an active PFC (Power Factor Corrector), and I scale both the active and the passive components according to the specification. After that I designed a galvanically isolated DC-DC converter. I introduced the controlling IC with every auxiliary components. After this I write about the microcontroller in the system, it\rq{}s function and about every other component, like display and fans.

In the third section I introduce software on the microcontroller, and every component of it. I write about configuring the development environment, peripherals, and controller specific topics.

The fourth chapter is about building and the starting-up of the circuit. I write about the starting of the low voltage parts, the PFC, and about the main circuit.

In the last section of my thesis, I draw the conclusions and I suggest further improvement possibilities.


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