Design, construction and testing of a three-phase low voltage power supply

Abstract

This study aimed to design, construct and test a three-phase low voltage variable power supply for EE/ECE laboratory with the following components: three-phase high voltage power supply of 220VAC, low voltage variable three-phase AC power supply with an output of 3V, 4.5V, 6V, 9V, 12V and DC output of 12V, +5V, 1.25V 12V. All outputs except the 220VAC are provided with over current circuit protection to protect the circuit and the component from overload and accidental short circuit. The parameters tested are the phase angle, (for AC output voltage only), output voltage, and maximum load current for both DC and AC output. After testing the power supply, the results show that all data have met the requirements with an acceptable level of error. This indicates that the design is valid, reliable and accurate and that the power supply was satisfactorily made and very adoptable to the needs of the EE/ECE Laboratory.