So As a final result of work, Energy meter prototype is ready and It is able to measure energy of a 60 Watt lamp.
In the part of design we have utilized ADE7753 chip from Analog devices which software calibrated IC so no need to have hardware calibration using resistors and all cumbersome way.And as I have already mentioned in first post that this IC is able to measure most of the power parameters like Active Power,Reactive power,RMS value of voltage ,current and frequency of signal and many more parameters.out of this only Active energy Part is implemented currently in a firmware.
For this to do , ADE7753 is interfaced with AVR(atmega16/32/1281) microcontroller through SPI interface .Through this interface we can provide different command for register reading and writting,Enabling and Dissabling Control flags like integrators,Gain adjustments etc.
Few problem which was found during development of this prototype is,when we tried to interface this IC ADE7753 with micon(Microcontroller) through SPI,we were not able to establish communication intially but finnally after correcting error of edge setting which is there in SPI control registers.
Another major problem which was found when we connected load to the energy meter prototype and when we switch off load then one of two IC get reseted.Probable reason for this may be due to sudden change in current which generates kind of noise.
Right now I am looking for solution of this and one probable solution for this is to use Ferrite bead to prevent noise transfer.I haven't tried this yet but I will try it soon.
29 Jan 2009
EaRTh
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