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.
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
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.