The project aims to build a
power supply unit for cars and other automobiles that requires an actual voltage of 12V from the range of 9V to 16V.
A singled-ended primary inductance
converter (SEPIC) topology is used in this project since it has the advantage of the ability to convert up or down with a minimum of parts and maximum efficiency. The topology has two inductors which can increase the efficiency when coupled. An RM10 core was used which is wound in bifilar fashion. For this type of ferrite core, RM is a generic classification.
Automobile Power Supply Circuit
A very common chip used is the UC3843 which was made by several manufacturers using slightly different numbering systems and comes in an 8-pin DIP package. Also incorporated in the design are the three types of protection which includes 6A Polyswitch fuse that provides protection against high temperatures and performs self-resetting. Another protection scheme is an 18V surge absorber and the third protection is a circuit with current limiting based on saturation voltage of the main switching
transistor.