CHAPTER ASIC (Application Specified Integrated Circuit). ASIC is

• Energy meter
• Arduino
• Android application

An electricity meter, electric meter, electrical meter, or energy meter is a device thatmeasures the amount of electric energy consumed by a residence, a business, or an electrically powered device.
Electronic Energy Meter is a substitute for the mechanical energy meter in use currently for monitoring the consumption of electrical energy. The product is targeted at the Electricity Boards and mass consumers. Features Static Energy Meter is based on state-of-the-art electronics technology.
Block diagram of EEM.

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The conventional mechanical energy meter is based on the phenomenon of “Magnetic Induction”. It has a rotating aluminum Wheel called Ferriwheel and many toothed wheels. Based on the flow of current, the Ferriwheel rotates which makes rotation of other wheels. This will be converted into corresponding measurements in the display section. Since many mechanical parts are involved, mechanical defects and breakdown are common. More over chances of manipulation and current theft will be higher.
Electronic Energy Meter is based on Digital Micro Technology (DMT) and uses no moving parts. So the EEM is known as “Static Energy Meter” In EEM the accurate functioning is controlled by a specially designed IC called ASIC (Application Specified Integrated Circuit). ASIC is constructed only for specific applications using EmbeddedSystemTechnology. Similar ASIC are now used in Washing Machines, Air Conditioners, Automobiles, Digital Camera etc.
In addition to ASIC, analogue circuits, Voltage transformer, Current transformer etc are also present in EEM to “Sample” current and voltage. The ‘Input Data’ (Voltage) is compared with a programmed “Reference Data’ (Voltage) and finally a ‘Voltage Rate’ will be given to the output. This output is then converted into ‘Digital Data’ by the AD Converters (Analogue- Digital converter) present in the ASIC.
The Digital Data is then converted into an “Average Value”. Average Value / Mean Value is the measuring unit of power. The output of ASIC is available as “Pulses” indicated by the LED (Light Emitting Diode) placed on the front panel of EEM. These pulses are equal to Average Kilo Watt Hour (kWh / unit). Different ASIC with various kWh are used in different makes of EEMs. But usually 800 to 3600 pulses / kWh generating ASIC s are used in EEMs.The output of ASIC is sufficient to drive a Stepper Motor to give display through the rotation of digits embossed wheels. The output pulses are indicated through LED.


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