AN2288 Datasheet PDF - STMicroelectronics
Part Name
AN2288
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29 Pages
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242.9 kB
MFG CO.
STMicroelectronics
Introduction
This application note describes the design for a single-phase power / energy meter with tamper detection. The design measures active power, voltage, current, power factor and line frequency in a single-phase distribution environment and displays active energy, voltage, current, power factor, line frequency, current date and time. It differs from ordinary singlephase meters in that it uses two current transformers (CT) to measure active power in both live and neutral wires. This enables the meter to detect, signal, and continue to measure the active energy consumed reliably even when subject to external tamper attempts.
ST7FLITE20 is the microcontroller used to perform all the measurements in the meter. As the ST7FLITE30 is pin-to-pin compatible with ST7FLITE20, the ST7LITE30 can also be used in this application (replacing the ST7LITE20) but a revalidation is required for finding the accuracy class of the meter.
The active energy consumed is available in the form of frequency-modulated pulse outputs and the accumulated active energy on an LCD display module. Additional features for both consumer types can also be incorporated. These include multiple tariff rates and improved communications, through which meter readings can be taken with less time and with higher accuracy.
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