Maxim MAXQ3183电能测量前端方案

Maxim 公司的MAXQ3183是专用的电能测量前端IC,收集和计算多相电压,电流,功率,能量,以及多相负载的其它测量和电源质量参数.计算结果通过SPI总线由外接主机进行处理. MAXQ3183和三相/3线以及三线/4线兼容,单电源3.3V 工作,典型低功耗为35mW.主要用于三相多功能电表.本文介绍MAXQ3183主要特性,方框图, 简化时钟源, 能量计算的相位补偿框图, 表观和无功电能计算框图,以及典型应用电路图.

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应用:

3-Phase Multifunction Electricity Meters

图1.MAXQ3183方框图

图2.MAXQ3183简化时钟源

图3.MAXQ3183能量计算的相位补偿框图

图4.MAXQ3183表观和无功电能计算框图

图5.MAXQ3183典型应用电路图