AN3306 Datasheet, PDF (1/21 Pages) STMicroelectronics – Current sensing in metering applications using

AN3306
Application note
Current sensing in metering applications using a
Pulse current sensor and ST metering devices
Introduction
This application note describes the benefits of a current sensing system for metering
applications using STPMxx metering devices and a current sensor developed by Pulse
Engineering Inc. (hereafter referred to as “Pulse current sensor”), based on the Rogowski
coil principle. Following an overview of the Rogowski coil principle, the Pulse current sensor
is introduced along with a comparison to other current measuring devices. This is followed
by a presentation of the characteristics of the STPMxx family of metering devices, and the
results of accuracy testing conducted using a demonstration board with the STPM01 and
the Pulse current sensor.
The results obtained from the accuracy testing conducted with the STPM01 can be
considered valid for all devices in the STPMxx family that share the same architecture^(a).
In Figure 1 below the measuring system block diagram is provided.
Figure 1. Block diagram of a Rogowski coil-based application with the STPM01
a. Excludes only the STPM10
November 2010
Doc ID 18182 Rev 1
AM00178v1
1/21
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