Two-Phase Power Meter Reference Design

TWO-PHASE-POWER-METER

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With the growing consumption of energy worldwide, particularly in the residential market, utility providers need increasingly accurate and cost-effective energy metering solutions. The Kinetis® M series two-phase electricity meter reference design addresses these accuracy and cost needs by providing a high-performance analog front end combined with an embedded programmable gain amplifier to increase the accuracy of energy measurement.

Product Details

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Block Diagram

Two Phase Meter

Two Phase Power Meter Reference Design Block Diagram
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Supported Devices

Wireless Connectivity

Multiprotocol MCUs

  • KW41Z: Kinetis® KW41Z-2.4 GHz Dual Mode: Bluetooth® Low Energy and 802.15.4 Wireless Radio Microcontroller (MCU) based on Arm® Cortex®-M0+ Core

Sensors

Accelerometers

  • FXOS8700CQ: Digital Motion Sensor - 3D Accelerometer (±2g/±4g/±8g) + 3D Magnetometer

Processors and Microcontrollers

KM Series Cortex-M0+

  • KM1x: 50 MHz, Mainstream Precision Metrology Microcontrollers based on Arm® Cortex®-M0+
  • KM3x: 50–75 MHz Precision Metrology MCUs with Segment LCDs based on Arm® Cortex®-M0+

Features

Features

  • 200 A current range (CL200, TA 30A)
  • 85 to 264 V, 50/60 Hz voltage range
  • Two types of installation: Form 2S or Form 12S
  • Accuracy class: ANSI C12.20-2002 Class 0.2
  • Line frequency measurement (for precision zero-cross detection)
  • Current transformer sensing circuit implementation for each phase
  • Low-power modes including the use of built-in RTC (Li-battery backup)
  • AMI expansion header supporting 2.4 GHz 802.15.4 or HAN/NAN (with 6loWPAN IPv6) communications for AMR and remote control
  • EMC proven design (ANSI C62.41, IEC 61000-4-4)

Peripherals

  • 8 x 20 segment LCD, including charge pump
  • LED pulse outputs (kWh, kVARh)
  • Isolated (4 kV) RS-232 port for monitoring, parameterization and firmware upgrade (optional)
  • Infrared optical port according to ANSI C12.18-2006 (optional)

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Design Resources

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