PWM PIC16F877A dimming electronic ballast for HPS lamp

Abstract

Universiti Teknologi Malaysia (UTM) is a second highest on energy consumption in Johor Baharu. One of the factors influenced the consumption of energy in UTM is street lighting energy usage which consumes about 1,238.24 MWh per year of the total energy consumption in UTM. This is approximately 2.08% of the total of energy consumption in UTM. Currently, the conventional street lighting installed in the UTM consists of 956 units of 150W and 277 units of 250W High Pressure Sodium (HPS) lamp. This type of street lighting usually integrated with magnetic ballast where it is cheap and robust. However, the operation hours cannot be controlled by using this ballast, meaning the operating hours for the street lighting are 12 hours per day, hence consuming more energy. Thus, to overcome the problem on high energy consumption and operating cost, this thesis proposes to use a Pulse Width Modulation (PWM) PIC16F877a dimming electronic ballast to replace the existing system. The aim is to develop the PWM dimming electronic ballast for the street lighting system with more energy saving and environmental friendly. An experiment on the developed electronic ballast controller was performed on one unit of a 150W HPS lamp and the result was projected for 956 units for 150W HPS lamp in UTM. Results show that this new ballast system able to save energy up to 31.79% with a payback period of 1 year and 7 months. Analysis also indicates the reduction of Carbon Dioxide (CO2) emission of 173397.79 kg per year.