Load Variation Detection and Compensation in Device-to-Device Wireless Charging

Technology #16727

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Professor Anantha Chandrakasan
Department of Electrical Engineering and Computer Science, MIT
External Link (www-mtl.mit.edu)
Rui Jin
Department of Electrical Engineering and Computer Science, MIT
Managed By
Jack Turner
MIT Technology Licensing Officer
Patent Protection

Method and Apparatus for Wirelessly Charging Portable Electronic Devices

US Patent Pending


Wireless device-to-device charging for portable devices, including wearables or medical implants

Problem Addressed

Device-to-device wireless charging for portables suffers from variation of coupling between the transmitter and receiver due to the relative motion of these devices, which reduces efficiency. Current wireless charging technologies utilize stationary devices positioned relative to a receiver. Current technology that exists to adapt to a time-varying load is inefficient.


The invention is a phone-to-portable wireless charging system with transmitter-side circuitry that detects and dynamically compensates for load variation to maintain high efficiency and regulate power levels.


  • Dynamically adjusts to load, thereby maintaining efficient power transmission
  • Responds efficiently to both increases and decreases in measured load
  • Compensates for changes in load through adjusting transmitter-side components instead of adjusting the load, reducing the cost of receiver components