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.

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 Arm 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

  • 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)

Buy Options

MKM14Z128ACHH5-Image

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  • MKM14Z128ACHH5
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  • Kinetis KM14: 50MHz Cortex-M0+ Metrology MCU, 128KB Flash, 16KB SRAM, 44-LGA.

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MKM33Z128ACLH5-Image

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  • MKM33Z128ACLH5
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  • Kinetis KM33: 50MHz Cortex-M0+ Metrology MCU, 128KB Flash, 16KB SRAM, Segment LCD, 64-LQFP.

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