ADI公司的ADE7880是帶諧波檢測高精度三相多功能電表集成電路,具有串行接口和三個靈活的脈沖輸出.器件集成了二階Sigma-Delta ADC,數字積分器,基準電路,以及需要實現有功(基波和諧波)和表觀功率測量,rms計算以及基波有功功率和無功功率測量的所有信號處理,支持IEC 62053-21, IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3, ANSI C12.20和IEEE1459標準,支持 IEC 61000-4-7 Class I 和Class II 精度指標,工作電壓2.4 V到3.7 V,主要用在能兩計量系統,電源質量監測,太陽能逆變器,過程監測和保護設備.本文介紹了ADE7880主要特性,方框圖,測試電路以及多種數據測量數據鏈和諧波計算圖.

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 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應用:

Energy metering systems

Power quality monitoring

Solar inverters

Process monitoring

Protective devices


圖1. ADE7880智能電表外形圖

圖2. ADE7880方框圖

圖3. ADE7880測試電路圖

圖4. ADE7880總有用功率數據鏈

圖5. ADE7880總有用功率累加圖

圖6. ADE7880基本無用功率累加圖

圖7. ADE7880表觀功率數據流程和累加圖

圖8. ADE7880能量/頻率轉換圖

圖9. ADE7880諧波計算圖
詳情請見:
http://www.analog.com/static/imported-files/data_sheets/ADE7880.pdf
和
http://www.analog.com/static/imported-files/overviews/ADE7880_Polyphase_Energy_Metering_IC.pdf