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Making wireless charging efficient





Leave your cables at home and enjoy the ease of wireless charging with Avnet’s receiver solutions. Innovations in charging technology have allowed for the development of more efficient wireless chargers that are now used in a plethora of devices. From mobile phones to wearables, there are now more ways to ensure a faster charge for your gadgets.

With close to 15 years of expertise in wireless power design and testing, Avnet helps users to simplify their power needs while delivering optimal performances for businesses.




Receiver Solution – Pure RX

Wireless charging RX uses MC9RS08KB12
Avnet has developed a 5W Wireless charging (RX) Supply Solution:
• The output specification: 5V/1A
• Standard WPC receiver coil
• LED indicates power transfer/fault state


Features

• MCU chip: NXP MC9RS08KB12 DSC.
    - Power topology:
      1. Serial resonance capacitor for efficient power transfer.
      2. Parallel resonance capacitor for detection purposes.
      3. Rectifier: Full bridge (Hi_Side: Diode/Lo-Side: MOSFET )
      4. Buck circuit.
• OCP protection function.
• OTP protection function





Receiver Solution 2 – RX Bank

Wireless charging RX Bank uses MC9RS08KB12
Avnet has developed a 10.5W Wireless charging (RX Bank) Supply Solution:
• Two output specification: 5V/2.1A/total current 3.1A (Max).
• Micro USB in for charging battery.
• Standard WPC receiver coil.
• LED indicates power transfer/fault state.
• Topology cost: Low cost (TBD).
• Coil cost: Low cost (TBD).


Features
• MCU chip: NXP MKL04Z16VFK4 DSC.
    - Power topology:
      1. Serial resonance capacitor for efficient power transfer.
      2. Parallel resonance capacitor for detection purposes.
      3. Input selector (USB, Battery, and RX).
      4. High efficiency. Synchronous charging circuit (BUCK & Booster)
• OCP protection function.
• OTP protection function




Receiver Solution – RX Charger
Wireless charging RX Charger uses MC9RS08KB12

A 5W Wireless charging (RX) Supply Solution:
• The output specification: 4.2V/1A.
• Standard WPC receiver coil.
• LED indicates power transfer/fault state.
• Topology cost: Low cost (TBD).
• Coil cost : Low cost(TBD).


Features
• MCU chip: NXP MC9RS08KB12 DSC.
    - Power topology:
      1. Serial resonance capacitor for efficient power transfer.
      2. Parallel resonance capacitor for detection purposes.
      3. Rectifier: Full bridge (Hi_Side: Diode/Lo-Side: MOSFET)
      4. Battery charger mode: CC mode, CV mode.
• OCP protection function.
• OTP protection function




Wearables

Overview: The reference solution consists of a WPC standard Qi (WPC 1.1) complaint receiver (use Qi’s coil), and a NFC circuit

The WPC receiver obtains power from a transmitter through inductive coupling, communicates with the transmitter to regulate amount of power transferred. The circuit coverts voltage to standard 5-V, 500-mA output, or a single cell Li-lon battery chargers to supply power 250-mA to various mobile devices. It is capable of delivering.







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