ADE7880—Polyphase Energy Metering IC Includes High ... · PDF file• 40-lead lead...
Transcript of ADE7880—Polyphase Energy Metering IC Includes High ... · PDF file• 40-lead lead...
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.
Features• Supports IEC 62053-21,
IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3, and ANSI C12.20 standards
• 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
• Supports current transformer and di/dt current sensors
• 10 ppm/°C typical reference drift with external overdrive capability
• 40-lead lead frame chip scale 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
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
ADE7880—Polyphase Energy Metering IC Includes High Accuracy Harmonic Analysis
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Functional Block Diagram
General DescriptionThe 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
27
28
PM0
PM127CLKIN
28CLKOUT
13ICP
14ICN
19VCP
18VN
9IBP
PGA3
PGA3
PGA1
PGA1
12IBN
22VBP
ADC
ADC
ADC
ADC
ADC
PGA3
PGA1
PGA2
ADC
ADC
16INN
15INP
7IAP
8IAN
23VAP
17
REFIN/OUT26
VDD
25
AGND24
AVDD5
DVDD6
DGND4
RESET
1.2VREF
POR LDO LDO
APHCAL AVGAIN
HPF
AIGAIN
HPF
DIGITALINTEGRATOR
NIGAIN
HPF
DIGITALINTEGRATOR
TOTAL/FUNDAMENTAL ACTIVE ENERGIES,FUNDAMENTAL REACTIVE ENERGY,
APPARENT ENERGY, VOLTAGE/CURRENT RMS,HARMONIC INFORMATION CALCULATION
FOR PHASE B (SEE PHASE A FOR DETAILED PATH)
TOTAL/FUNDAMENTAL ACTIVE ENERGIES,FUNDAMENTAL REACTIVE ENERGY,
APPARENT ENERGY, VOLTAGE/CURRENT RMS,HARMONIC INFORMATION CALCULATION
FOR PHASE C (SEE PHASE A FOR DETAILED PATH)
COMPUTATIONAL BLOCK FOR HARMONICINFORMATION ON NEUTRAL CURRENT
HPFEN OFCONFIG3
HPFEN OF CONFIG3
HPFEN OFCONFIG3
X2 NIRMSLPF
NIRMSOS
COMPUTATIONALBLOCK FOR
FUNDAMENTALACTIVE AND
REACTIVE POWER
X2 AIRMSLPF
AIRMSOS
X2 AVRMSLPF
LPF
AVRMSOS
AVAGAIN
AWGAINAWATTOS
APGAIN AFWATTOS PHASEA, B,AND
C DATA
DFC
CF1DEN
: 33 CF1
DFC
CF2DEN
: 34 CF2/HREADY
DFC
CF3DEN
: 35 CF3/HSCLK
APGAIN AFVAROS
COMPUTATIONALBLOCK FOR HARMONIC
INFORMATION ON PHASE A
CURRENT AND VOLTAGE
36
32
29
SPI/I2C
I2C
IRQ0
IRQ1
SCLK/SCL
38 MOSI/SDA
37 MISO/HSD
39 SS/HSAHSDC
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DIGITAL SIGNALPROCESSOR
HARMONICCOMPUTATION
ENGINE
IA, VAIB, VBIC, VC
IN, ISUM
PHASE SELECTION A OR B OR C
OR N
HARMONIC INDEXES
ZYX
TIME BASE, UPDATE RATE,AND DATA INTERFACE
OPTIONS
3 HARMONICS AND FUNDAMENTAL RESULTS
NEUTRAL AND ISUM RESULTS
WATT IRMS POWER FACTOR
VAR VRMS HARMONIC DISTORTION
VA THD + N
IRMS
ISUMRMS
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