Development of a Hybrid Solar-Dynamo Powered Charging System

ADEJUMOBI, Isaiah Adediji and ADEBISI, Oluwaseun Ibrahim and MATTI, Shaeed Opeyemi (2017) Development of a Hybrid Solar-Dynamo Powered Charging System. ABUAD Journal of Engineering Research and Development (AJERD), 1 (1). pp. 1-9.

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Abstract

The extension of Global System for Mobile communication (GSM) to rural and semi-urban dwellers, who are predominantly farmers, is geared towards enhancing economic growth of the rural communities. Unfortunately, majority of these rural and urban communities do not have access to basic electricity supply needed to power mobile phone chargers. An indigenous technology which uses Solar– Dynamo Power that harnesses the energies in sun and bicycle pedals to generate electricity is presented in this paper. In this work, a dynamo mounted on the rear wheel of an adult size bicycle, is actuated through pedaling the bicycle. The dynamo converts the mechanical power generated by the peddler to electrical power. The electric power produced is processed for voltage rectification and voltage regulation to charge a battery which would supply the utilities for mobile phone recharging and illumination. A 2Wpeak solar powered system was also incorporated into the design as a back up to charge the battery when the bicycle is not pedaled. The speed selection, solar power sizing and the switching mechanism are also presented. The supply circuits (rectification and regulation) and the Switching Control were implemented and simulated via Livewire and Proteus 8.0. The dynamo was modelled at different AC voltages and corresponding frequencies were obtained. The dynamo output voltage for the required regulated output of 5V (DC) and the time required were obtained. A full day test was also carried out to determine selection switch mechanisms between solar and dynamo circuits. The minimum pedaling speed for charging of the battery for the chosen size of the bicycle was also determined.

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