Load Variation Detection and Compensation in Device-to-Device Wireless Charging
Wireless device-to-device charging for portable devices, including wearables or medical implants
Researchers
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method and apparatus for wirelessly charging portable electronic devices
United States of America | Granted | 10,164,472
Technology
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.
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 has drawbacks including reduced efficiency, increased cost, and increased EMI.
Advantages
- 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, and instead of adjusting the frequency or duty cycle, reducing the EMI.
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