ADE7761A

过期

带内置故障检测和零线断线检测功能的电能计量IC

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概述

High accuracy, active energy measurement IC supports IEC 62053-21
Less than 0.1% error over a dynamic range of 500 to 1
Supplies active power on the frequency outputs,
High frequency output CF is intended for calibration and supplies instantaneous active power
Continuous monitoring of the phase and neutral current allows fault detection in 2-wire distribution systems
Current channels input level best suited for shunt and current transformer sensors

Uses the larger of the two currents (phase or neutral) to bill—even during a fault condition
Continuous monitoring of the voltage and current inputs allows missing neutral detection
Uses one current input (phase or neutral) to bill when missing neutral is detected
Two logic outputs (FAULT and REVP) can be used to indicate a potential miswiring, fault, or missing neutral condition
Direct drive for electromechanical counters and 2-phase stepper motors (F1 and F2)
Proprietary ADCs and DSP provide high accuracy over large variations in environmental conditions and time

ADE7761A是一款适合用于双线配电系统的高精度、容错、电能计量IC。该器件规范超过IEC61036标准规定的精度要求。ADE7761A中使用的唯一模拟电路是ADC和参考电压电路。所有其它信号处理（例如乘法和滤波）都是在数字域实现的。这种信号处理方法可在随环境条件和时间变化的很大范围内提供优异的稳定性和精度。ADE7761A包含类似于ADE7751的故障检测功能，不断监测相电流和零线电流。当这两个电流差值超过6.25%时，便指示发生故障。

ADE7761A采用一种不断监测输入电压的零线断线检测方案。当检测到零线断线状态时（即无电压输入），ADE7761可根据有功电流信号继续计费（请见“零线断线模式”部分）。当FAULT引脚变高电平时，指示为零线断线状态。ADE7761A的低频输出F1和F2引脚提供平均有功功率信息。CF逻辑输出引脚提供瞬时有功功率信息。

ADE7761A包含一个检测V_DD电源引脚的内置电源监测电路。其内部相位匹配电路保证电压通道和电流通道匹配。ADE7761A的内部空载阈值电路保证它在空载时无任何潜动现象。