STMicroelectronics AN2288 Single-Phase Energy Meter Application Note

This application note describes the design for a single-phase power / energy meter with tamper detection.

Brand: STMicroelectronics
Category: Other Electronics
Document type: Application Note
Language: English
Pages: 29
File format: PDF
File size: 241 KB
Published: 07 August, 2012
Updated: 30 September, 2023
MD5 checksum: D51EA902253D83F07DE34E1817FD4D3E
PDF: STMicroelectronics AN2288 Single-Phase Energy Meter Application Note PDF

About this manual

The document details a cost-effective and flexible design for a single-phase power and energy meter that fulfills IEC 61036:1996 + A1: 2000 standards. It utilizes the ST7FLITE20 microcontroller to perform all measurements and calculations without an external dedicated device (ASSP). The design measures active power, voltage, current, power factor, and line frequency in a single-phase distribution environment.

What's inside

Features
Overview
Theory
Analog frontend
Meter hardware
Software routines
Results
Calibration coefficients
Revision history

Specifications

Standards Compliance	IEC 61036:1996 + A1: 2000
Current Rating (Ib)	10A
Maximum Current (Imax)	55A
Voltage Range	140V to 300V
Sampling Rate	5kHz
Sampling Time	200us
Pulse Output	32 000 Impulses/kWh
ADC Resolution	10-bit SAR

Frequently asked questions

What microcontroller is used in this design?

The ST7FLITE20 microcontroller is used to perform all the measurements in the meter.

How does the meter detect tampering?

It uses two current transformers (CT) to measure active power in both live and neutral wires to detect tamper attempts.

Can the firmware be updated after installation?

Yes, the firmware can be modified and updated at any time using In-Circuit Programming, even when the meter is installed and running.

Download PDF (241 KB)