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Reference Solutions

A baseline for wireless charging

Wireless charging is gaining in popularity, with consumers taking to its convenience and ease of use. Devices can now be easily charged and ready to go without the need for power cords. A universal technology standard, Qi, has in fact been established by the Wireless Power Consortium. Widespread industry adoption means QI is now available in many locations where charging is most needed, like airports, automobiles, hotels and offices.

The Baselines Power Profile or BPP comprises the minimum set of features applying to power transmitters and power receivers that can transfer around 5W of power. These are compliant with Wireless Power Consortium standards for charging handphones, medical devices and wearable applications. To support this demand, Avnet offers a wide range of low charging solutions.  Our GDS customized solutions come with a customer support model that involves definition & requirement, development, certification and production.

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NXP – Low Power Solution

Features

  • Supports wide DC input voltage range starting from 4.2 V, typically 5 V, 12 V and 19 V.
  • Integrated digital demodulation on chip.
  • Supports Foreign Object Detection (FOD).
  • Dynamic input power limit for limited input power supply, like USB power.
  • Supports any guided positioning single coil power transmitter solutions using frequency and duty cycle control.
  • LED & buzzer for system status indication.
  • FreeMASTER GUI tool to enable configuration, calibration and debugging.

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Key Components

  • Transmitter Controller: MWCT1000CFM (NXP)
  • LDO: AP2139AK-3.3TRG1 (DIODES)
  • Current Shunt Monitor: INA199A2 (TI)
  • Synchronous Driver: ISL6596CBZ*2 (INTERSIL)
  • Coil: A11 coil

 

Target Applications

  • Standard low power transmitter.
  • Any guided positioning single coil solution with frequency & duty cycle control (WPC A types or customer properties).

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NXP – Low Power Solution

Features

  • Single-chip WPC 1.2 Qi-compliant device for single-coil low-power transmitter.
  • Integrated full-bridge power stage with low EMI.
  • Very few external components, low cost solution.
  • Low Standby power.
  • Power stage fully protected against OCP and OTP.
  • RMS voltage input to support optimal PID operation.
  • 2 LED output and 1 buzzer output.
  • Smart Power Limiting (SPL) function to adapt to power-limited 5 V supplies.
  • Static Power Reduction (SPR) function to limit power consumption.
  • Chip: 5mm*5mm, 32-HVQFN package.

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Key Components

  • Transmitter: NXQ1TXH5 (NXP)
  • Crystal: ST3215SB32768H5HPWAA (Kyocera)
  • Coil: A11 coil (Gotrend)


Target Applications

  • Standard low power transmitter.
  • WPC compliant wireless transmitters for smart phones, medical and wearable applications.