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A single-phase energy meter with capacitive power supply and shunts

Posted: 19 Jul 2010     Print Version  Bookmark and Share

Keywords:energy meter  capacitive power supply  MC9S08GW64 power 

The MC9S08GW64 is a low-power MCU suitable for a single-phase energy metering application. It is capable of running on a capacitive power supply. A shunt can be used for the current-sensing element. This use of a capacitive power supply and a shunt for current sensing make the MC9S08GW64 suitable for a very low-cost BOM energy meter.

The first half of this application note describes the use of the capacitive supply for a single-phase energy metering application. A detailed analysis of the power requirements of the MC9S08GW64 is included. Sample software application code has also been provided, to be directly used in an application. The second half of this document describes how to connect the voltage and current sensing circuit to the MC9S08GW64. Schematics for the voltage sensing circuit and the current sensing circuit have also been provided.

View the PDF document for more information.

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