ADI公司的ADE7953是帶零線電流測量的單相多功能電表集成電路,高精度地測量火線電壓和電流,并計算出有功,無功和表觀功率以及即時的RMS電壓和電流.器件包括三個Delta-Sigma ADC和高精度電能測量核,動態范圍3000:1, 有功和無功功率的測量誤差小于0.1%.本文介紹了ADE7953主要特性,方框圖,多各種信號鏈和處理框圖, 單相電表評估板和接口板電路圖以及評估板軟件.

ADE7953:Single Phase Multifunction Metering IC with Neutral Current Measurement

The ADE7953 is a high accuracy electrical energy measurement IC intended for single phase applications. It measures line voltage and current and calculates active, reactive, and apparent energy, as well as instantaneous rms voltage and current. The device incorporates three Σ-Δ ADCs with a high accuracy energy measurement core. The second input channel simultaneously measures neutral current and enables tamper detection and neutral current billing. The additional channel incorporates a complete signal path that allows a full range of measurements. Each input channel supports independent and flexible gain stages, making the device suitable for use with a variety of current sensors such as current transformers (CTs) and low value shunt resistors. Two on-chip integrators facilitate the use of Rogowski coil sensors. The ADE7953 provides access to on-chip meter registers via a variety of communication interfaces including SPI, I2C, and UART. Two configurable low jitter pulse output pins provide outputs that are proportional to active, reactive, or apparent energy, as well as current and voltage rms. A full range of power quality information such as overcurrent, overvoltage, peak, and sag detection are accessible via the external IRQ pin. Independent active, reactive, and apparent no-load detections are included to prevent “meter creep.” Dedicated reverse power (REVP), zero- crossing voltage (ZX), and zero-crossing current (ZX_I) pins are also provided. The ADE7953 energy metering IC operates from a 3.3 V supply voltage and is available in a 28-lead LFCSP package.

ADE7953主要特性:

Measures active, reactive, and apparent energy; sampled waveform; current and voltage rms

Provides a second current input for neutral current measurement

Less than 0.1% error in active and reactive energy measurements over a dynamic range of 3000:1

Less than 0.2% error in instantaneous IRMS measurement over a dynamic range of 1000:1

Provides apparent energy measurement and instantaneous power readings 1.23 kHz bandwidth operation

Flexible PGA gain stage (up to ×22)

Includes internal integrators for use with Rogowski coil sensors SPI, I2C, or UART communication

圖1.ADE7953方框圖

圖2.ADE7953測試電路圖

圖3.ADE7953電流通路ADC和信號通路圖

圖4.ADE7953電壓通路ADC和信號通路圖

圖5.ADE7953電流通路RMS信號處理框圖

圖6.ADE7953電壓通路RMS信號處理框圖

圖7.ADE7953有用功率信號鏈


圖8.ADE7953無功功率信號鏈

圖9.ADE7953表觀功率累加信號鏈

ADE7953單相電表評估板
 
The ADE7953 evaluation kit includes two boards that together allow the performance of the ADE7953 single phase energy meter-ing IC to be evaluated. The ADE7953 evaluation kit includes evaluation software, written in LabVIEW®, that provides access to the registers of the ADE7953 using a PC interface.

This document provides information about using the evaluation kit to evaluate the ADE7953 silicon.

圖10.ADE7953單相電表評估板外形圖

圖11.ADE7953接口板外形圖

圖12.ADE7953單相電表評估板電路圖(1)

圖13.ADE7953單相電表評估板電路圖(2)

圖14.ADE7953接口板電路圖(1)

圖15.ADE7953接口板電路圖(2)

評估板軟件見:
http://www.analog.com/static/imported-files/eval_boards/ADE7953_evalboard_software.zip
詳情請見:
http://www.analog.com/static/imported-files/data_sheets/ADE7953.pdf
和
http://www.analog.com/static/imported-files/user_guides/UG-194.PDF