Design and Construction of an Alternative Laptop Power Supply System

Abstract

The growing use of tablets, palmtops, and laptops and erratic power supply
have necessitated the design of an alternative laptop power source.
Occasionally, in-build battery of laptops weakens with time. Moreover, battery
can be destroyed for being discharged below its manufacturer’s specified
discharge voltage limit, when left for few hours. In this regard a boost converter
that enables powering a laptop from a DC source has been designed,
constructed and tested. The circuit and simulation were prepared with Proteus
Intelligent Schematic Input System (ISIS). For the safety of the storage battery
circuit and the laptop, a deep discharge and reverse voltage protection was also
incorporated in the design. LED indicators show wrong connection, low battery
and ON charging state. The circuit was tested with different laptops and inkjet
printers and was found be working satisfactorily.