Maxim MAXQ3181三相電錶前端方案

Maxim 公司的MAXQ3181是三相電錶測試前端,能收集和計算多相電壓.電流,有源功率和能量以及多相負載的其它許多計量參數.和三相/三線,三相/四線和其它的三相製式兼容,有源功率和能量線性誤差0.1%,RMS壓和電流線性誤差0.5%,單電源3.3V工作,低功耗(典型值35mW),主要用在3相電錶測量.本文介紹了MAXQ3181主要特性,方框圖, 簡化時鍾源框圖, RMS值計算框圖, 能量計算相位補償框圖以及取樣電流和電壓輸入電路, 典型應用電路.

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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