ADE7880–Polyphase Energy Metering

ADE7880—Polyphase Energy Metering IC
Includes High Accuracy Harmonic Analysis
Features
• Supports IEC 62053-21,
• 10 ppm/°C typical reference drift
IEC 62053-22, IEC 62053-23,
EN 50470-1, EN 50470-3, and
ANSI C12.20 standards
with external overdrive capability
• 40-lead lead frame chip scale
• Supports IEC 61000-4-7 Class I
and II accuracy specification
• Supplies rms, active, reactive and
apparent powers, power factor,
THD + N and harmonic distortion
of all harmonics within 2.8 KHz
pass band
package (LFCSP), Pb-free, pin
for pin compatible with ADE7854,
ADE7858, ADE7868, and ADE7878
• Wide-supply voltage operation:
2.4 V to 3.7 V
• Operating temperature:
−40° to +85°C
• Supports current transformer
and di/dt current sensors
Parameter
Error Rate
Dynamic Range @ TA = 25°C
Harmonic voltage/current rms
<1% error
2000:1
Harmonic active/reactive powers
<1% error
2000:1
Active/reactive energy
<0.1% error
1000:1
Active/reactive energy
<0.2% error
5000:1
Voltage/current rms
<0.1% error
1000:1
The ADE7880 is a high accuracy, 3-phase electrical energy measurement
IC featuring an adaptive real time monitoring (ARTM) harmonic engine.
ARTM is capable of monitoring three user selectable harmonics, in addition
to the fundamental. ARTM automatically tracks fundamental frequency and
provides real-time harmonic measurement updates. Harmonic analysis
includes current rms, voltage rms, active, reactive, and apparent powers,
power factor, harmonic distortion, and total harmonic distortion plus noise
(THD + N) calculations.
The ADE7880 incorporates seven second-order Σ-Δ ADCs, a digital
integrator, reference circuitry, and all the signal processing required to
perform total (fundamental and harmonic) active, fundamental active,
fundamental reactive, and apparent energy measurement and rms
calculations.
The ADE7880 is suitable to measure active, reactive, and apparent energy
in various 3-phase configurations, such as wye or delta services, with
both three and four wires. This metering IC provides system calibration
features for each phase: rms and energy offset correction, phase calibration,
and gain calibration.
The ADE7880 supports IEC 62053-21, IEC 62053-22, IEC 62053-23,
EN 50470-1, EN 50470-3, ANSI C12.20, and IEC 61000-4-7 standards.
The ADE7880 is pin compatible with the popular ADE7878, ADE7868,
ADE7858, and ADE7854 3-phase energy metering ICs.
analog.com/energymeter
Functional Block Diagram
RESET
REF IN/OUT
4
17
VDD AGND AVDD
26
DVDD
DGND
5
6
24
25
AIRMSOS
POR
CLKIN 27
CLKOUT 28
LDO
LDO
1.2V
REF
HPFEN OF
CONFIG3
IAP 7
AIGAIN
PGA1
ADC
IAN 8
PGA3
VAP 23
IBP 9
ADC
PGA1
ADC
IBN 12
PGA3
VBP 22
ICP 13

ADC

COMPUTATIONAL
BLOCK FOR
FUNDAMENTAL
ACTIVE AND
REACTIVE POWER
PGA1
ADC
ICN 14
PGA3
VCP 19
ADC
VN 18
AWGAIN
TOTAL/FUNDAMENTAL ACTIVE ENERGIES,
FUNDAMENTAL REACTIVE ENERGY,
APPARENT ENERGY, VOLTAGE/CURRENT RMS,
HARMONIC INFORMATION CALCULATION
FOR PHASE C (SEE PHASE A FOR DETAILED PATH)
:
DFC
APGAIN
AFWATTOS
APGAIN
AFVAROS
PHASE
A, B,
AND
C DATA
:
DFC
ADC
INN 16
DIGITAL
INTEGRATOR
NIGAIN
PGA2
DFC
NIRMSOS
X2
HPF
34
CF2/HREADY
35
CF3/HSCLK
29
IRQ0
32
IRQ1
36
SCLK/SCL
38
MOSI/SDA
37
MISO/HSD
39
SS/HSA
CF3DEN
SPI/I2C
INP 15
CF1
:
COMPUTATIONAL
BLOCK FOR
HARMONIC
INFORMATION
ON PHASE A
CURRENT AND
VOLTAGE
COMPUTATIONAL BLOCK FOR HARMONIC
INFORMATION ON NEUTRAL CURRENT
HPFEN OF
CONFIG3
33
CF2DEN
LPF
HPF
TOTAL/FUNDAMENTAL ACTIVE ENERGIES,
FUNDAMENTAL REACTIVE ENERGY,
APPARENT ENERGY, VOLTAGE/CURRENT RMS,
HARMONIC INFORMATION CALCULATION
FOR PHASE B (SEE PHASE A FOR DETAILED PATH)
PM1
CF1DEN
AVRMSOS
AWATTOS
HPFEN OF CONFIG3
AVGAIN
PM0
28
AVRMS
LPF
HPF
APHCAL
AIRMS
LPF
X2
DIGITAL
INTEGRATOR
27
AVAGAIN
X2
LPF
I2 C
NIRMS
DIGITAL SIGNAL
PROCESSOR
HSDC
General Description
The ADE7880 ARTM features complete harmonic analysis including magnitude and phase information. ARTM also computes
harmonic distortion relative to the fundamental, as well as THD + N. Harmonic analysis data can be accessed in real time using a
burst mode transfer via an SPI interface.
The ADE7880 waveform sample registers allow access to all ADC outputs. This device also incorporates power quality measurements
such as short duration low or high voltage detections, short duration high current variations, line voltage period measurement, and
angles between phase voltages and currents. Two serial interfaces can be used for communication: SPI or I2C. A dedicated high speed
interface HSDC (high speed data capture) port can be used in conjunction with I2C to provide access to the ADC outputs and real-time
power information. Two interrupt request pins, IRQ0 and IRQ1, indicate that an enabled interrupt event has occurred. The CF1, CF2, and
CF3 logic outputs provide a wide choice of power information: total/fundamental active/reactive power, total apparent power, or sum of
current rms values.
ADE7880 Harmonic Calculations
PHASE
SELECTION
A OR B OR C
OR N
HARMONIC
INDEXES
X
Y
Z
3 HARMONICS AND FUNDAMENTAL RESULTS
IA, VA
IB, VB
IC, VC
HARMONIC
COMPUTATION
ENGINE
WATT
IRMS
POWER FACTOR
VAR
VRMS
HARMONIC DISTORTION
VA
THD + N
IN, ISUM
NEUTRAL AND ISUM RESULTS
IRMS
ISUMRMS
TIME BASE, UPDATE RATE,
AND DATA INTERFACE
OPTIONS
I 2C refers to a communications protocol originally
developed by Philips Semiconductors (now NXP
Semiconductors).
©2011 Analog Devices, Inc. All rights reserved.
Trademarks and registered trademarks are the
property of their respective owners.
Printed in the U.S.A.
PH10189-2-9/11
analog.com/energymeter
Analog Devices, Inc.
Worldwide Headquarters
Analog Devices, Inc.
One Technology Way
P.O. Box 9106
Norwood, MA 02062-9106
U.S.A.
Tel: 781.329.4700
(800.262.5643,
U.S.A. only)
Fax: 781.461.3113
Analog Devices, Inc.
Europe Headquarters
Analog Devices, Inc.
Wilhelm-Wagenfeld-Str. 6
80807 Munich
Germany
Tel: 49.89.76903.0
Fax: 49.89.76903.157
Analog Devices, Inc.
Japan Headquarters
Analog Devices, KK
New Pier Takeshiba
South Tower Building
1-16-1 Kaigan, Minato-ku,
Tokyo, 105-6891
Japan
Tel: 813.5402.8200
Fax: 813.5402.1064
Analog Devices, Inc.
Southeast Asia
Headquarters
Analog Devices
22/F One Corporate Avenue
222 Hu Bin Road
Shanghai, 200021
China
Tel: 86.21.2320.8000
Fax: 86.21.2320.8222
Similar pages