IDT 90E36三相电能表设计方案

IDT公司的IDT90E32/36三相电能计量芯片,集成了7个单独的2阶sigma-delta ADC,可实现三相四线系统中的三个电压通路(A,B和C相)和四个电流通路(A,B,C相和中线),和标准IEC62052-11, IEC62053-22 and IEC62053-23, ANSI C12.1与ANSI C12.20兼容,动态范围6000:1时的有功功率精度±0.1%,无功功率精度±0.2%,片内的基准电压温度系数6 ppm/ ℃,主要用于0.5S 级或1级三相四线(Y0)和三相三线(Y或Δ)电表,数据采集终端,电源监视仪表等.本文介绍了90E36主要特性,方框图以及三相四线电流互感器(CT)电表电路图和材料清单, 三相四线Rogowski线圈电表电路图和材料清单, 三相三线电表电路图和材料清单.
The 90E36 is a poly-phase high performance wide-dynamic range metering IC. The 90E36 incorporates 7 independent 2nd order sigma-delta ADCs, which could be employed in three voltage channels (phase A, B and C) and four current channels (phase A, B, C and neutral line) in a typical three-phase four-wire system.
The 90E36 has an embedded DSP which executes calculation of active energy, reactive energy, apparent energy, fundamental and harmonic active energy over ADC signal and on-chip reference voltage.
The DSP also calculates measurement parameters such as voltage and current RMS value as well as mean active/reactive/apparent power.
A four-wire SPI interface is provided between the 90E36 and the external microcontroller. In addition, DMA mode can be used for 7-channel ADC raw data access, offering more flexibility in system application.
The 90E36 is suitable for poly-phase multi-function meters which could measure active/reactive/apparent energy and fundamental/harmonic energy either through four independent energy pulse outputs CF1/CF2/CF3/CF4 or through the corresponding registers.
With the on-chip THD and DFT engine, all phases’ THD and DFT results can be directly accessed through related registers, thus simplifying hardware design in Data Acquisition Terminals.
IDT’s proprietary ADC and auto-temperature compensation technology for reference voltage ensure the 90E36’s long-term stability over variations in grid...