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A Wirelessly Rechargeable AA Battery Using Electrodynamic Wireless Power Transmission

Author

Listed:
  • Spencer E. Smith

    (Interdisciplinary Microsystems Group (IMG), Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA)

  • Miah A. Halim

    (Interdisciplinary Microsystems Group (IMG), Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA)

  • Stasiu T. Chyczewski

    (Interdisciplinary Microsystems Group (IMG), Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA)

  • Adrian A. Rendon-Hernandez

    (Interdisciplinary Microsystems Group (IMG), Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA)

  • David P. Arnold

    (Interdisciplinary Microsystems Group (IMG), Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611, USA)

Abstract

We report the design, fabrication, and characterization of a prototype that meets the form, fit, and function of a household 1.5 V AA battery, but which can be wirelessly recharged without removal from the host device. The prototype system comprises a low-frequency electrodynamic wireless power transmission (EWPT) receiver, a lithium polymer energy storage cell, and a power management circuit (PMC), all contained within a 3D-printed package. The EWPT receiver and overall system are experimentally characterized using a 238 Hz sinusoidal magnetic charging field and either a 1000 µF electrolytic capacitor or a lithium polymer (LiPo) cell as the storage cell. The system demonstrates a minimal operating field as low as 50 µT rms (similar in magnitude to Earth’s magnetic field). At this minimum charging field, the prototype transfers a maximum dc current of 50 µA to the capacitor, corresponding to a power delivery of 118 µW. The power effectiveness of the power management system is approximately 49%; with power effectiveness defined as the ratio between actual output power and the maximum possible power the EWPT receiver can transfer to a pure resistive load at a given field strength.

Suggested Citation

  • Spencer E. Smith & Miah A. Halim & Stasiu T. Chyczewski & Adrian A. Rendon-Hernandez & David P. Arnold, 2021. "A Wirelessly Rechargeable AA Battery Using Electrodynamic Wireless Power Transmission," Energies, MDPI, vol. 14(9), pages 1-14, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:9:p:2368-:d:541326
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    Cited by:

    1. Young-Jin Park, 2022. "Next-Generation Wireless Charging Systems for Mobile Devices," Energies, MDPI, vol. 15(9), pages 1-4, April.

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