ADI’s ADE7880 is a high-precision three-phase multi-function meter integrated circuit with harmonic detection, with a serial interface and three flexible pulse outputs. The device integrates a second-order Sigma-Delta ADC, a digital integrator, a reference circuit, and needs Enables active (fundamental and harmonic) and apparent power measurements, rms calculations and all signal processing for fundamental active and reactive power measurements, supporting IEC 62053-21, IEC 62053-22, IEC 62053-23, EN 50470 -1, EN 50470-3, ANSI C12.20 and IEEE1459 standards, support IEC 61000-4-7 Class I and Class II accuracy indicators, working voltage 2.4 V to 3.7 V, mainly used in power metering systems, power quality monitoring , solar inverter, process monitoring and protection equipment. This article introduces the ADE7880 main features, block diagram, test circuit and various data measurement data links and harmonic calculation diagrams.
The ADE7880 is high accuracy, 3-phase electrical energy measurement IC with serial interfaces and three flexible pulse outputs. The ADE7880 device incorporates second-order sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), a digital integrator , reference circuitry, and all of the signal processing required to perform the total (fundamental and harmonic) active, and apparent energy measurements, rms calculations, as well as fundamental-only active and reactive energy measurements. In addition, the ADE7880 computes the rms of harmonics on the phase and neutral currents and on the phase voltages, together with the active, reactive and apparent powers, and the power factor and harmonic distortion on each harmonic for all phases. Total harmonic distortion plus noise (THD + N) is computed for all currents and voltages. A fixed function digital signal processor (DSP) executes this signal processing. The DSP program is stored in the internal ROM memory.
The ADE7880 device incorporates second-order sigma-delta (Σ-Δ) analog-to-digital converters (ADCs), a digital integrator, reference circuitry, and all of the signal processing required to perform the total (fundamental and harmonic) active, and apparent energy measurements, rms calculations, as well as fundamental-only active and reactive energy measurements. In addition, the ADE7880 computes the rms of harmonics on the phase and neutral currents and on the phase voltages, together with the active, reactive and apparent energy powers, and the power factor and harmonic distortion on each harmonic for all phases. Total harmonic distortion plus noise (THD + N) is computed for all currents and voltages. A fixed function digital signal processor (DSP) executes this signal processing. The DSP program is stored in the internal ROM memory. 1 is high accuracy, 3-phase electrical energy measurement IC with serial interfaces and three flexible pulse outputs. The
The ADE7880 is suitable for measuring active, reactive, and apparent energy in various 3-phase configurations, such as wye or delta services with, both, three and four wires. The ADE7880 provides system calibration features for each phase, that is, rms offset correction, phase calibration, and gain calibration. The CF1, CF2, and CF3 logic outputs provide a wide choice of power information: total active powers, apparent powers, or the sum of the current rms values, and fundamental active and reactive powers.
The ADE7880 contains waveform sample registers that allow access to all ADC outputs. The devices also incorporate 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, SPI and I2C, can be used to communicate with the ADE7880. A dedicated high speed interface, the high speed data capture (HSDC) port, can be used in conjunction with I2C to provide access to the ADC outputs and real -time power information. The ADE7880 also has two interrupt request pins, ADE7880 is in a tampering situation. The ADE7880 is available in the 40-lead LFCSP, Pb-free package, pin-for-pin compatible with ADE7854, ADE7858, ADE7868, and ADE7878 devices. IRQ0 and IRQ1, to indicate that an enabled interrupt event has occurred. Three specially designed low power modes ensure the continuity of energy accumulation when the
ADE7880 main features:
Highly accurate; supports IEC 62053-21, IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3, ANSI C12.20, and IEEE1459 standards
Supports IEC 61000-4-7 Class I and Class II accuracy specification
Compatible with 3-phase, 3- or 4-wire (delta or wye), and other 3-phase services
Supplies rms, active, reactive and apparent powers, power factor, THD + N, and harmonic distortion of all harmonics within 2.8 kHz pass band on all phases
Supplies rms and harmonic distortions of all harmonics within 2.8 kHz pass band on neutral current
Less than 1% error in harmonic current and voltage rms, harmonic active and reactive powers over a dynamic range of 2000 to 1 at TA = 25℃
Supplies total (fundamental and harmonic) active and apparent energy and fundamental active/reactive energy on each phase and on the overall system
Less than 0.1% error in active and fundamental reactive energy over a dynamic range of 1000 to 1 at TA = 25℃
Less than 0.2% error in active and fundamental reactive energy over a dynamic range of 5000 to 1 at TA = 25℃
Less than 0.1% error in voltage and current rms over a dynamic range of 1000 to 1 at TA = 25℃
Battery supply input for missing neutral operation
Wide-supply voltage operation: 2.4 V to 3.7 V
Reference: 1.2 V (drift 10 ppm/°C typical) with external overdrive capability
40-lead lead frame chip scale package (LFCSP), Pb-free, pin-for-pin compatible with ADE7854, ADE7858, ADE7868 and ADE7878
ADE7880 application:
Energy metering systems
Power quality monitoring
Solar inverters
Process monitoring
Protective devices
Figure 1. ADE7880 Smart Meter Outline Diagram
Figure 2. ADE7880 Block Diagram
Figure 3. ADE7880 Test Circuit Diagram
Figure 4. ADE7880 Total Useful Power Data Chain
Figure 5. ADE7880 Total Useful Power Accumulation Plot
Figure 6. ADE7880 Basic Unwanted Power Accumulation Diagram
Figure 7. ADE7880 Apparent Power Data Flow and Accumulation Diagram
Figure 8. ADE7880 Energy/Frequency Conversion Diagram
Figure 9. ADE7880 Harmonic Calculation Diagram
For details, see:
http://www.analog.com/static/imported-files/data_sheets/ADE7880.pdf
and
http://www.analog.com/static/imported-files/overviews/ADE7880_Polyphase_Energy_Metering_IC.pdf
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