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Cirrus Logic, Inc.

http://www.cirrus.com

Application Note

Using the CS5480/84/90 Energy Measurement IC

with Rogowski Coil Current Sensors

1. Introduction

Rogowski coil, or di/dt, current sensors have been increasingly implemented in AC power and energy measurement

applications because of their exceptional linearity, high current capacity and dynamic range, light weight, and

electrical isolation. The Cirrus Logic energy measurement ICs CS5480, CS5484 and CS5490 support various types

of Rogowski coils.

This application note presents accuracy results from testing the CS5480 with three different types of Rogowski coil

sensor. The CS5484 and CS5490 use the same core technology. Testing results of the CS5484 and CS5490 show

nearly identical results. Comparable power meters were constructed using the CS5480 and three Rogowski coils:

Pulse Electronics PA3202NL, TAEHWATRANS TR9L, and Sentec Mobius. Accuracy test results are presented that

demonstrate that the CS5480 can achieve an energy measurement accuracy of 0.1% over a 4000:1 dynamic range

when interfaced to a Rogowski coil.

2. Rogowski Coil Overview

A Rogowski coil current sensor is a helical coil of wire wrapped around an AC line conductor and used to measure

the flow of electric charge through the conductor. Since a Rogowski coil has an air core instead of an iron core, the

measurements show excellent linearity with practically no saturation problems. In addition, the Rogowski coil rates

highly for electrical isolation from the buss bar, and is light weight with low material cost. The Rogowski coil is

increasingly being implemented when measuring high-current AC power and energy.

v(t)

i(t)

Figure 1. Rogowski Coil Current Sensor

AN365

MAR’12

AN365REV1

1 2 3 4 5 6 ... 13 14

Resumo do Conteúdo

Página 1 - Application Note

Página 2 - 3. Rogowski Coil Support

AN36510 AN365REV14.2.3 IRMS Load PerformanceLoad Current (A)Current Dynamic Range (x:1)IRMS Register Value(10-Second Average)IRMS Error120 1 0.5999616

Página 3 - Phase of Rogowski Integrator

AN365AN365REV1 114.3 Load Performance with Sentec4.3.1 Active Energy Load PerformancePower Factor Load Current (A) Current Dynamic Range (x:1) ErrorPF

Página 4 - 3.3 Filter Selection

AN36512 AN365REV14.3.2 Reactive Energy Load PerformanceFigure 11. Reactive Energy Load PerformancePower Factor Load Current (A) Current Dynamic Range

Página 5

AN365AN365REV1 134.3.3 IRMS Load PerformanceFigure 12. IRMS Load Performance5. SummaryThe CS5480 energy measurement IC supports Rogowski coils using

Página 6

AN36514 AN365REV1Revision History Revision Date ChangesREV1 MAR 2012 Initial Release.Contacting Cirrus Logic SupportFor all product questions and inqu

Página 7

AN3652 AN365REV1The voltage v(t) that is induced in the Rogowski coil is proportional to the rate of the charge of current (di(t)/dt) andis based on F

Página 8

AN365AN365REV1 33.1 Connection Between a Rogowski Coil and the CS5480Since the Rogowski coil has an inherent 20dB/decade gain, a single-pole low-pass

Página 9

AN3654 AN365REV13.2 PGA Selection on the Current ChannelThe CS5480 current channel incorporates a programmable gain amplifier (PGA) with two selectabl

Página 10 - Load Performance

AN365AN365REV1 54.1 Load Performance with Rogowski Coil PA3202NL4.1.1 Active Energy Load PerformancePower Factor Load Current (A) Current Dynamic Rang

Página 11

AN3656 AN365REV14.1.2 Reactive Energy Load PerformancePower Factor Load Current (A) Current Dynamic Range (x:1) Errorsin = 180 1 0.00%8 10 0.01%0.8 1

Página 12

AN365AN365REV1 74.1.3 IRMS Load PerformanceLoad Current (A)Current Dynamic Range (x:1)IRMS Register Value(10-Second Average)IRMS Error80 1 0.60011034

Página 13 - 5. Summary

AN3658 AN365REV14.2 Load Performance with Rogowski Coil TR9L4.2.1 Active Energy Load PerformancePower Factor Load Current (A) Current Dynamic Range (x

Página 14 - Revision History

AN365AN365REV1 94.2.2 Reactive Energy Load PerformancePower Factor Load Current (A) Current Dynamic Range (x:1) Errorsin = 1120 1 -0.01%12 10 -0.03%1

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