Maxim 公司的MAXQ3181是三相电表测试前端,能收集和计算多相电压.电流,有源功率和能量以及多相负载的其它许多计量参数.和三相/三线,三相/四线和其它的三相制式兼容,有源功率和能量线性误差0.1%,RMS压和电流线性误差0.5%,单电源3.3V工作,低功耗(典型值35mW),主要用在3相电表测量.本文介绍了MAXQ3181主要特性,方框图, 简化时钟源框图, RMS值计算框图, 能量计算相位补偿框图以及取样电流和电压输入电路, 典型应用电路.
The MAXQ3181 is a dedicated electricity measurement front-end that collects and calculates polyphase voltage, current, active power and energy, and many other metering parameters of a polyphase load. The computed results can be retrieved by an external master through the on-chip serial peripheral interface (SPI™) bus. This bus is also used by the external master to configure the operation of the MAXQ3181 and monitor the status of operations.
The MAXQ3181 performs voltage and current measurements using an integrated ADC that can measure up to seven external differential signal pairs. An eighth differential signal pair is used to measure the die temperature.
An internal amplifier automatically adjusts the current channel gain to compensate for low-current channel-signal levels.
MAXQ3181主要特性:
♦ Compatible with 3-Phase/3-Wire, 3-Phase/4-Wire, and Other 3-Phase Services
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