LIGHTWEIGHT PORTABLE POWER SUPPLY WITH VARIABLE OUTPUT VOLTAGE

Power supply is a device or system that supplies electrical power. Power supply is
one of the main pie~:es of test equipment that is required to test any type of
component or circuit in the lab. When we are looking at the test equipment in the
market, it can be seen that bench top power supplies or lab power supplies are very
necessary especially among the students or lecturer but the cost is too expensive. The
power supplies those !l.re available in the m!l.rket curterttly also hot portable and heavy
in weight. Therefore, the main objective of this project is to produce a lightweight
and porli6le power supply with a miriliiium cost, weight, size and cuciiit complexity
while also reducing electrical stresses on the semiconductor devices. A new topology
is proposed which combirtes the functions of rectifier, Buck-Boost cohverter or
known as step-up and step-down converter into a single circuit reducing components
used resulting in a unit that is compact, portable, lightweight and cheap. Using a
rechargeable 1.2V batteries, the voltage can step up to 5V and 12V by apply the
bllCk-bOost method. Thus, with this 12V of voltage, this power supply is able to apply
like the bench top power supply or lab power supply. There are many switch mode
power supplies that can be used in the lab, but these types of power supplies are not
portable and economical for students to purchase. There is a need in the industry for a
portable power supply tliat ciiii be used in various locations wlieii AC is not available.
This portable lightweight power supply is an alternative for the student who wants a
portable power supply with an internal rech!l.rgeable battery to supply the output
power. This system has a selling price of under RMl OO.So students can afford the test
e<iiiipmeiit wlllcli will last Them tmoiignoiit tlieir college career and iiito Their
professional career. The weight is approximately 0.28g compared to bench top power
supply which is approximately 6kg.