Self-tuning inductive powering for implantable telemetric monitoring systems

Schuylenbergh, Koenraad Van; Puers, Robert

doi:10.1016/0924-4247(96)80117-8

Cited by 32 publications

(19 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As a result, others have described primary circuits that sense this condition, and shift their driving frequency to compensate [6]. A series-tuned secondary avoids the need to track any resonance shifts in this case, thereby simplifying circuits, while also being inherently well suited for high power applications in the first place.…”

Section: Capacitor Tuning Optionsmentioning

confidence: 95%

Near-Field Wireless Power Transfer

Mercier

Chandrakasan

2015

Integrated Circuits and Systems

View full text Add to dashboard Cite

Wireless power transfer links are becoming increasingly important for consumer, industrial, and medical electronic devices. There are two principal applications for wireless power transfer that require different optimization criteria: continuous power deliver (e.g., cochlear implant) and periodic charging (e.g., cellular phone). In the former case, optimizing power transfer efficiency is a metric of great importance, while in the latter case, minimizing charging time by maximizing power transfer is important. This chapter presents analytical equations that predict optimal conditions for both applications through first-principals step-bystep reflected load analysis. These equations are then used as the basis for the design of a rapid wireless ultra-capacitor charging circuit that speeds up time-to-charge by 3.7 .

show abstract

Section: Capacitor Tuning Optionsmentioning

confidence: 95%

Near-Field Wireless Power Transfer

Mercier

Chandrakasan

2015

Integrated Circuits and Systems

View full text Add to dashboard Cite

show abstract

“…These changes result in less than optimal operating conditions of the inductive link which may result in excessive heating of the surrounding tissue and decreased supply voltage and current to the prosthesis. In order to maintain optimal operation of the link, closed-loop operation control can be implemented [10], [11]. Adaptive control using back-telemetry of the supplied voltage can close the power supply loop resulting in optimum transfer by boosting the primary voltage when the load is high and reducing the primary voltage when the load is small.…”

Section: Inductive Power Linkmentioning

confidence: 99%

Closed-loop inductive link for wireless powering of a high density electrode array retinal prosthesis

Felic

Skafidas

et al. 2009

2009 Electromagnetic Compatibility Symposium Adelaide

View full text Add to dashboard Cite

A retinal prosthesis intended for rehabilitation of vision impaired patients will require continuous power supply in order to achieve real-time moving images. In this work, we explore the use of inductive coils fabricated using flexible circuit technologies for inductive powering of the implanted prosthetic device. We found that manufacturing technologies dictate the optimum operating frequency of the coil. For a minimum track width and spacing of 4 mils, the optimum frequency was found to be 2.9 MHz. We also looked at the distribution of electric and magnetic fields generated by the inductive coils in and surrounding the eye. These simulation results show that there are electric field concentrations around the conductive coils. Apart from the coils, we need to design an efficient circuit to drive the transmit coil and recover the transmitted power. In order to maintain optimal operation of the link, a closed-loop load modulation feedback operation is proposed. Adaptive control using back-telemetry of the induced voltage on the secondary side can close the power supply loop and result in optimum power transfer by boosting the supply voltage on the primary side when load is high and reducing this voltage when load is small.

show abstract

“…To solve this issue, one can act either on the self-inductance (L P ) alone, the capacitor (C) alone, or on both elements simultaneously. At the frequencies currently used for transferring power through human body, i.e., 3 kHz to a few megahertzs, variation of the self-inductance can be performed with the classical saturable reactor [3], [4]. Unfortunately, a saturable reactor calls for a bulky magnetic circuit and, consequently, cannot satisfy both the weight and miniaturization constraints of the aeronautic and space applications and cannot comply with the MRI compatibility regulations.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Power Transfer Through Human Body With an Auto-Tuning System Using a Synchronous Switched Capacitor

Rodes

Zhang

Denieport

et al. 2015

IEEE Trans. Circuits Syst. II

View full text Add to dashboard Cite

This brief presents an auto-tuning system for a wireless power transmitter that uses a variable synchronous switched capacitor for controlling the resonant frequency of the tank circuit of a half-bridge voltage-mode resonant converter. This original tuning topology does not need the addition of any bulky magnetic components and, consequently, naturally complies with the magnetic resonance imaging (MRI) compatibility regulations imposed to electromedical units used in the vicinity of MRI equipment.Index Terms-Auto-tuning system, magnetic resonance imaging (MRI), resonant converter, synchronous switched capacitor, wireless power transmission.

show abstract

Self-tuning inductive powering for implantable telemetric monitoring systems

Cited by 32 publications

References 4 publications

Near-Field Wireless Power Transfer

Near-Field Wireless Power Transfer

Closed-loop inductive link for wireless powering of a high density electrode array retinal prosthesis

Optimization of the Power Transfer Through Human Body With an Auto-Tuning System Using a Synchronous Switched Capacitor

Contact Info

Product

Resources

About