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ADI ADE7878高精度三相电表方案.pdf
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2019-09-05
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ADI 公司的ADE7878是高精度三相电能测量IC,集成了串行接口和三个灵活的脉冲输出,包括有二阶Delta-Sigma ADC,数字积分器,基准电路
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ADI ADE7878 高精度三相电表方案
ADI 公司的 ADE7878 是高精度三相电能测量 IC,集成了串行接口和三个灵活的脉冲输出,包
括有二阶 Delta-Sigma ADC,数字积分器,基准电路,以及进行总的有功,无功和表观能量测量以
RMS 计算所需要的所有信号处理.采用固定功能的 DSP 来实现这些信号处理. ADE7878 具有
精度高,支持 EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22 and IEC 62053-23,和三相
三线或四线制兼容,测量误差小于 0.1%, 工作电压在 2.4 到 3.7V.本文介绍 ADE7878 主要特
性,功能方框图, 总的有功和无功与表观电量累加框图,以及评估板 EVAL-ADE7878EB 主要
特性,方框图, 电路图和材料清单 BOM.
The ADE7878
is a high accuracy, 3-phase electrical energy measurement IC with serial interfaces
and three flexible pulse outputs. The ADE7878 incorporates second-order Σ-Δ ADCs, a digital
integrator, reference circuitry, and all the signal processing required to perform total (fundamental
and harmonic) active, reactive and apparent energy measurement, fundamental only active and
reactive energy measurement and rms calculations. A fixed function digital signal processor (DSP)
executes this signal processing.
TheADE7878 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. The ADE7878
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/fundamental active/reactive power, total apparent power or sum of current rms
values.
The ADE7878 has waveform sample registers that allow access to all ADC outputs. The 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 to communicate with the
ADE7878: SPI or I
2
C while a dedicated high speed interface, HSDC (High Speed Data Capture)
port, can be used in conjunction with I
2
C to provide access to the ADC outputs and real time
power information. The ADE7878 has also two
interrupt request pins, IRQ0 and IRQ1 , to indicate that an enabled interrupt event has occurred.
Three specially designed low power modes ensure the continuity of the energy accumulation when
the ADE7878 is in tampering situation.
The ADE7878 is available in 40-lead LFCSP lead free package.
ADE7878 主要特性:
Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22 and IEC
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