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MAXQ3181 低功耗、有功功率測(cè)量、多相AFE (應(yīng)用電

2009-12-17 13:15本站整理 佚名我要評(píng)論（0）我要收藏

MAXQ3181 低功耗、有功功率測(cè)量、多相AFE (應(yīng)用電路)

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.

關(guān)鍵特性

  • 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)

    應(yīng)用/使用

    3相有功功率電表

    MAXQ3181：典型應(yīng)用電路
    典型應(yīng)用電路

    • 標(biāo)簽：AFE(10)MAXQ3(2)
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