Implementation of single phase watt hour meter using LPC2148

Abstract

The LPC2148 device is the latest system-on-chip (SOC), which belongs to the ARM generation of devices. This generation of devices belongs to the powerful 32-bit ARM platform bringing in a lot of new features and flexibility to support robust single, two and 3-phase metrology solutions. This thesis however, discusses the implementation of 1-phase solution only. These devices find their application in energy calculation and have the necessary architecture to support them. Furthermore, for large scale manufacturing, the costs can become lower than those of the electromechanical meters currently in production. This device presents a totally electronic single phase energy meter for residential use, based on ARM processor. A four digit display is used to show the consumed power. A prototype has been implemented to adequate measurement up to 5A load current from a 230V (phase to neutral) voltage. Higher current capacity can be easily obtained by simply replacing the shunt resistor. And, by changing the transformer tap and the voltage divider ratio, it can be easily manipulated for use in a 220 V supply.