Maxim MAXQ3183電能測量前端方案

Maxim 公司的MAXQ3183是專用的電能測量前端IC,收集和計(jì)算多相電壓,電流,功率,能量,以及多相負(fù)載的其它測量和電源質(zhì)量參數(shù).計(jì)算結(jié)果通過SPI總線由外接主機(jī)進(jìn)行處理. MAXQ3183和三相/3線以及三線/4線兼容,單電源3.3V 工作,典型低功耗為35mW.主要用于三相多功能電表.本文介紹MAXQ3183主要特性,方框圖, 簡化時(shí)鐘源, 能量計(jì)算的相位補(bǔ)償框圖, 表觀和無功電能計(jì)算框圖,以及典型應(yīng)用電路圖.

The MAXQ3183 is a dedicated electricity measurement front-end that collects and calculates polyphase voltage, current, power, energy, and many other metering and power-quality 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 MAXQ3183 and monitor the status of operations.

The MAXQ3183 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.

MAXQ3183主要特性:

? Compatible with 3-Phase/3-Wire, 3-Phase/4-Wire

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

? Reactive Power and Energy of Each Phase and Combined, Positive and Negative

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

? Neutral Line Current Measurement

? Vector Sum of 3-Phase Currents and Neutral Current

? Line Frequency (Hz)

? Power Factors

? Voltage Phasor Angles

? Voltage and Current Phase Sequence Indications

? Phase Voltage Absence Detection

? Voltage and Current Harmonic Measurement

? Phase Current THDN

? Fundamental and Total Power and Energy

? AC/DC Mode Current and Voltage Measurement

? Two Pulse Outputs: Configurable for Active, Reactive, and Apparent Powers

? Programmable Meter Constants and Pulse Widths

? Programmable No-Load Current Threshold

? Programmable Thresholds for Undervoltage and Overvoltage Detection

? Programmable Threshold for Overcurrent Detection

? Programmable Vector Sum Threshold for Bypass 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

? 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 (IRQ) Output

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

MAXQ3183應(yīng)用:

3-Phase Multifunction Electricity Meters

圖1.MAXQ3183方框圖

圖2.MAXQ3183簡化時(shí)鐘源

圖3.MAXQ3183能量計(jì)算的相位補(bǔ)償框圖

圖4.MAXQ3183表觀和無功電能計(jì)算框圖

圖5.MAXQ3183典型應(yīng)用電路圖