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A Power-Efficient Wireless Capacitor Charging System Through an Inductive Link.

Hyung-Min Lee1, Maysam Ghovanloo1

  • 1GT-Bionics Laboratory, School of Electrical and Computer Engineering, Georgia Institute of Technology, Atlanta, GA 30308 USA.

IEEE Transactions on Circuits and Systems. II, Express Briefs : a Publication of the IEEE Circuits and Systems Society
|March 29, 2014
PubMed
Summary
This summary is machine-generated.

This study presents a power-efficient wireless capacitor charging system for inductive power applications. The novel system achieves high charging efficiency using a fixed current and adaptive tuning, ideal for CMOS-integrated devices.

Keywords:
Adaptive capacitor tuningcapacitor chargercharging efficiencyinductive power transmission

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Integrated Circuits

Background:

  • Wireless power transfer systems require efficient energy storage solutions.
  • Inductively powered applications necessitate compact and integrated charging circuitry.
  • Capacitor charging efficiency is critical for overall system performance.

Purpose of the Study:

  • To develop a power-efficient wireless capacitor charging system for inductively powered applications.
  • To improve charging efficiency and reduce energy loss in switches.
  • To demonstrate a compact, CMOS-fabricated solution for sequential capacitor charging.

Main Methods:

  • A capacitor charging circuit utilizing a series charge injection capacitor was designed.
  • An adaptive capacitor tuner was implemented to maintain peak AC input voltage.
  • The system was fabricated using a 0.35-μm CMOS process, occupying 2.1 mm² chip area.

Main Results:

  • The system achieved a measured charging efficiency of 82%.
  • Each pair of 1 μF capacitors was charged to ±2 V in 420 μs.
  • The prototype successfully charged four pairs of capacitors sequentially from a 2.7-V peak AC input via a 2-MHz inductive link.

Conclusions:

  • The presented wireless capacitor charging system offers high power efficiency and integration capabilities.
  • The fixed charging current and adaptive tuning strategy effectively minimize energy loss.
  • This CMOS-based system is suitable for various inductively powered applications requiring efficient energy storage.