MAXQ3181 低功耗、有功功率测量、多相AFE (应用电

MAXQ3181 低功耗、有功功率测量、多相AFE (应用电路)

概述

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.

关键特性

Compatible with 3-Phase/3-Wire, 3-Phase/4-Wire, and Other 3-Phase Services

0.1% Active Power and Energy Linearity Error

0.5% Apparent Power and Energy Linearity Error

0.5% Linearity Errors for RMS Voltage and RMS Current

Neutral Line Current Measurement

Line Frequency (Hz)

Power Factors

Phase Sequence Indication

Phase Voltage Absence Detection

Programmable Pulse Width

Programmable No-Load Current Threshold

Programmable Meter Constant

Programmable Thresholds for Undervoltage and Overvoltage Detection

Programmable Threshold for Overcurrent Detection

Amp-Hours in Absence of Voltage Signals

On-Chip Digital Temperature Sensor

Precision Internal Voltage Reference 2.048V 30ppm/°C typical), Also Supports An External Voltage Reference

Active Power and Energy of Each Phase and Combined 3-Phase (kWh), Positive and Negative

Apparent Power and Energy of Each Phase and Combined 3-Phase

Supports Software Meter Calibration

Up to 3-Point Multipoint Calibration to Compensate for Transducer Nonlinearity

Power-Fail Detection

Bidirectional Reset Input/Output

SPI-Compatible Serial Interface with Interrupt Request (Acitve-Low IRQ) Output

Single 3.3V Supply, Low Power (35mW typical)

应用/使用

3相有功功率电表

典型应用电路