An Adaptable Charging Surface Provides Efficient and Location-Independent Wireless Power

We present a smart and stand-alone surface thought to wirelessly charge consumer electronic products without precise alignment between the transmitter and receiver coils. The system has two stages, an inductive sensing stage, working at 688 kHz, and a power stage based on the propagation of magnetoi...

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Bibliographic Details
Main Authors: Sandoval, Fralett Suarez, Torres Delgado, Sarai M., Wallrabe, Ulrike
Format: Conference Proceeding
Language:English
Subjects:
Coils
impedance modulation
Logic gates
metamaterial
MOSFET
power transmission efficiency
Receivers
resonators
Sensors
Switches
Two dimensional displays
Wireless power transfer
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Summary:We present a smart and stand-alone surface thought to wirelessly charge consumer electronic products without precise alignment between the transmitter and receiver coils. The system has two stages, an inductive sensing stage, working at 688 kHz, and a power stage based on the propagation of magnetoinductive waves throughout metamaterials. The power stage is identified as a two-dimensional (2D) magnetoinductive wave (MIW) device whose coupled, inductive-capacitive resonating cells have been optimized in previous work to provide efficient power transmission to a load of 5 Ω. The work presented here addresses standing waves inside the device that cause zones completely deprived of energy, the power nulls. We present in detail the inexpensive and simple circuitry used to detect the location of a receiver in real-time and consequently adjust the number of active cells of the 2D MIW device, avoiding in this way a receiver standing above a po wer null. The proposed system enables a charging surface of 22x22 cm 2 without power nulls along the X-direction.
ISSN:2573-7651
DOI:10.1109/WPTC48563.2020.9295581