Three-Phase Power Meter Reference Design

THREE-PHASE-POWER-METER

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The three-phase power meter reference design is used for measurement and registration of active and reactive energy in three-phase networks for direct connection. It is precertified according to European EN50470- 1, EN50470-3, class B and C, as well as to IEC 62053-21 and IEC 62052-11 international standards for electronic meters of active energy classes 2 and 1.

Block Diagram

Three Phase Meter

Three Phase Power Meter Block Diagram
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Supported Devices

Wireless Connectivity

Wireless 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

Processors and Microcontrollers

KM Series Arm Cortex-M0+

  • KM3x: 50–75 MHz Precision Metrology MCUs with Segment LCDs Based on Arm® Cortex®-M0+

Features

Connectors

  • Internal connector supporting Arduino® shield (Wi-Fi, Bluetooth) expansion boards

Interfaces

  • 4 x 40 segment LCD, including charge pump (values shown on LCD: V, A, W, Var, VA, kWh, kVarh, cos F, Hz, time, date
  • Isolated (4 kV) RS-232 port for monitoring, parameterization and firmware upgrade
  • Integrated wireless 15W transmitter supports fast charging for Samsung® and Apple® devices
  • Digital control buck-boost converter
  • One control IC controls buck-boost converter, charge, Qualcomm algorithm, PD communication and wireless power management

Design Features

  • Low-power design with operation in low-power modes and the use of built-in RTC (Li-battery backup)
  • 100 A current range, 85 to 264 V, 50/60 Hz voltage range

EMC

  • EMC proven design (EN61000-4-2, EN610004-4)

Accuracy

  • Accuracy class: C (active energy EN50470-3) and three or two percent (reactive energy EN62053-23)

Communications Infrastructure

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Part Description: Freedom Development Boards for Kinetis KW21Z, KW31Z and KW41Z MCUs. 2 boards per order..

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    Tower System Development Board for Kinetis KM14, KM33 and KM34 (50 MHz) MCUs.

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