ADI公司的ADE7953是带零线电流测量的单相多功能电表集成电路,高精度地测量火线电压和电流,并计算出有功,无功和表观功率以及即时的RMS电压和电流.器件包括三个Delta-Sigma ADC和高精度电能测量核,动态范围3000:1, 有功和无功功率的测量误差小于0.1%.本文介绍了ADE7953主要特性,方框图,多各种信号链和处理框图, 单相电表评估板和接口板电路图以及评估板软件.

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

图1.ADE7953方框图

图2.ADE7953测试电路图

图3.ADE7953电流通路ADC和信号通路图

图4.ADE7953电压通路ADC和信号通路图

图5.ADE7953电流通路RMS信号处理框图

图6.ADE7953电压通路RMS信号处理框图

图7.ADE7953有用功率信号链


图8.ADE7953无功功率信号链

图9.ADE7953表观功率累加信号链

ADE7953单相电表评估板
 
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.

图10.ADE7953单相电表评估板外形图

图11.ADE7953接口板外形图

图12.ADE7953单相电表评估板电路图(1)

图13.ADE7953单相电表评估板电路图(2)

图14.ADE7953接口板电路图(1)

图15.ADE7953接口板电路图(2)

评估板软件见:
http://www.analog.com/static/imported-files/eval_boards/ADE7953_evalboard_software.zip
详情请见:
http://www.analog.com/static/imported-files/data_sheets/ADE7953.pdf
和
http://www.analog.com/static/imported-files/user_guides/UG-194.PDF