A Smart Universal Charger

Sahani, A (2014) A Smart Universal Charger. Masters thesis, Indian Institute of Technology, Hyderabad.

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Abstract

The objective of this project is to develop a novel universal charger that can able to charge different electronic gadgets like laptops, smart phones, tablets etc. Conventionally different types of chargers or adapters are required for different types of gadgets as voltage rating of their batteries are different. At the same time it is cumbersome to carry all the chargers dur-ing our journey. So to avoid all these issues, in this project a universal charger has been de-veloped which can take both AC (with any frequency) and DC as input with a wide range of voltage at the same time it can able to charge the battery with desired voltage level. Here in the proposed universal charger a Flyback converter has been cascaded with multilevel buck DC-DC converter. Multilevel buck DC-DC converter has been used to reduce the voltage and current rating of the power electronics switches as well as to reduce the magnetic re-quirement. A TOP227Y switch has been used to control the Flyback converter, whereas ARDUINO UNO micro-controller based board has been used to sense the voltage level re-quired for electronics gadget and to control the output of multilevel buck converter based on the sensed voltage. Keeping view on distributed generation system the charger has been de-veloped so that it can take both AC as well as DC as input. The charger has been simulated using Matlab Simulink to verify the proposed charger circuit. A laboratory prototype also has been developed and verified with admissible accuracy.

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