ADI公司的ADE7816是精密的多路(六個電流通路,一個電壓通路)電表集成電路,可以測量線路電壓和電流,計算有功和無功能量以及瞬態rms電壓和電流.器件集成了7個sigma-delta (Σ-Δ) ADC和高精度能量測量內核,動態范圍1000:1時的精度誤差小于0.1%,支持電流變壓器和Rogowski線圈傳感器,工作帶寬2kHz,所有六個通路都能測量角度.工作電壓3.3V.本文介紹了ADE7816主要特性,功能方框圖, 測試電路圖, 信號流程框圖, 有功和無功功率信號流程框圖,以及ADE7816評估板主要特性和電路圖.
The ADE7816 is a highly accurate, multichannel metering device that is capable of measuring one voltage channel and up to six current channels. It measures line voltage and current and calculates active and reactive energy, as well as instantaneous rms
voltage and current. The device incorporates seven sigma-delta (Σ-Δ) ADCs with a high accuracy energy measurement core. The six current input channels allow multiple loads to be measured simultaneously. The voltage channel and the six current channels each have a complete signal path allowing for a full range of measurements. Each input channel supports a flexible gain stage and is suitable for use with current transformers (CTs). Six on-chip digital integrators facilitate the use of the Rogowski coil sensors.
The ADE7816 provides access to on-chip meter registers via either the SPI or I2C interface. A dedicated high speed interface, the high speed data capture (HSDC) port, can be used in conjunction with I2C to provide access to real-time ADC output information. A full range of power quality information, such as overcurrent, overvoltage, peak, and sag detection, is accessible via the two external interrupt pins, and IRQ0 IRQ1.
The ADE7816 energy metering IC operates from a 3.3 V supply voltage and is available in a 40-lead LFCSP that is Pb free and RoHS compliant.
ADE7816主要特性:
Measures active and reactive energy, sampled waveforms, and current and voltage rms
6 current input channels and 1 voltage channel
<0.1% error in active and reactive energy over a dynamic range of 1000:1
Supports current transformer and Rogowski coil sensors
Provides instantaneous current and voltage readings
Angle measurements on all 6 channels
2 kHz bandwidth operation
Reference: 1.2 V (drift 10 ppm/°C typical) with external overdrive capability
Flexible I2C, SPI, and HSDC serial interfaces
圖1. ADE7816功能方框圖
圖2. ADE7816測試電路圖
圖3. ADE7816信號流程框圖
圖4. ADE7816有功功率信號流程框圖
圖5. ADE7816無功功率信號流程框圖
ADE7816評估板
The ADE7816 evaluation kit includes an evaluation board that allows the performance of the ADE7816 6-channel energy measurement IC to be evaluated. The ADE7816 evaluation kit includes evaluation software, written in LabVIEW®, that provides access to the registers of the ADE7816 using a PC interface. This document provides information to assist the user in evaluating the ADE7816.
Complete specifications for the ADE7816 are available in the ADE7816 data sheet available from Analog Devices, Inc., and should be consulted in conjunction with this user guide when using the evaluation board.
ADE7816評估板主要特性:
Evaluation board to implement a fully functional 6-channel energy meter
Accompanying PC-based LabVIEW software
Easy connection of external transducers via screw terminals
Optically isolated metering components
USB-based PC connection
External voltage reference option available for on-chip reference evaluation
圖6.ADE7816評估板外形圖
圖7.ADE7816評估板電路圖(1)
圖8.ADE7816評估板電路圖(2)
圖9.ADE7816評估板電路圖(3)
詳情請見:
http://www.analog.com/static/imported-files/data_sheets/ADE7816.pdf
和
http://www.analog.com/static/imported-files/user_guides/UG-370.pdf
