SMART-PLUG: Smart Plug Reference Design

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SMART-PLUG: Smart Plug Reference Design

SMART-PLUG: Smart Plug Reference Design

Overview

This reference design offers both metering and WiFi capabilities:

  1. Metering - used to measure electronic power in single-phase and,
  2. WiFi - used for wireless control.

Plug status can be checked via a smart-phone application, including current active power, reactive power, grid frequency, history runtime. On/Off setting timer available as well.

Features

  • Based on Kinetis MKM14Z64 MCU
  • WIFI module based on QFM2202
  • 220V input voltage, 10A max current
  • Phase current sampling with 25ppm 5 mΩ current sampler by 24Bit SD ADC
  • Phase voltage sampling with 25ppm resistor voltage divider network by 24Bit SD ADC
  • On-chip voltage comparator (for precision grid frequency detection)
  • Single 32.788K crystal input for 5ppm RTC
  • External extendable 64Mb SPI Flash
  • Low-power modes including the use of built-in RTC
  • 3 channel LED pulse outputs for calibration(kWh, kVarh)
  • Provide android application to get active power, reactive power, apparent power, grid frequency and history runtime
  • Android application to set plug ON/Off, set timer for ON/Off at fixed time and set RTC time
  • Android application to set plug wifi module to power save mode
  • Cost-effective bill of materials
  • External extendable WIFI module with UART connection

Block Diagram

RDDSP56F8MCIMG.jpg

Design Resources

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最后更新:
‎08-11-2020 08:19 PM
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