ADI ADE7880多相多功能电表解决方案

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    *  ADI公司的ADE7880多相多功能电表解决方案

ADI公司的ADE7880是带谐波检测高精度三相多功能电表集成电路,具有串行接口和三个灵活的脉冲输出.器件集成了二阶Sigma-Delta ADC,数字积分器,基准电路,以及需要实现有功(基波和谐波)和表观功率测量,rms计算以及基波有功功率和无功功率测量的所有信号处理,支持IEC 62053-21, IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3, ANSI C12.20和IEEE1459标准,支持 IEC 61000-4-7 Class I 和Class II 精度指标,工作电压2.4 V到3.7 V,主要用在能两计量系统,电源质量监测,太阳能逆变器,过程监测和保护设备.本文介绍了ADE7880主要特性,方框图,测试电路以及多种数据测量数据链和谐波计算图.

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 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 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.

ADE7880主要特性:

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应用:

Energy metering systems

Power quality monitoring

Solar inverters

Process monitoring

Protective devices

图1. ADE7880智能电表外形图

图2. ADE7880方框图

图3. ADE7880测试电路图

图4. ADE7880总有用功率数据链

图5. ADE7880总有用功率累加图

图6. ADE7880基本无用功率累加图

图7. ADE7880表观功率数据流程和累加图


图8. ADE7880能量/频率转换图


图9. ADE7880谐波计算图