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Related Concept Videos

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Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
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In a balanced four-wire wye-to-wye system, the arrangement involves wye-connected sinusoidal voltage sources and loads, connected through a neutral wire that links the neutral nodes of the source and load. The load impedance is connected across each phase of the load. The wye-connected source can be connected to the wye-connected load in four-wire and three-wire arrangements. A three-phase system is considered balanced when the load on each phase is equal, leading to uniform current flow and...
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Related Experiment Video

Updated: Feb 25, 2026

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A Magnetic-Balanced Inductive Link for the Simultaneous Uplink Data and Power Telemetry.

Chen Gong1, Dake Liu2, Zhidong Miao3

  • 1Institute of Application Specific Instruction-Set Processors, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing 100081, China. gongchen@bit.edu.cn.

Sensors (Basel, Switzerland)
|August 3, 2017
PubMed
Summary

This study introduces a novel magnetic-balanced inductive link for implantable biomedical devices, significantly improving signal-to-interference ratio for simultaneous wireless power and data transmission. The new design enhances data integrity and power efficiency in small sensors.

Keywords:
biomedical telemetryimplantable biomedical sensorsinductive linkintraocular sensorssimultaneous data and power transmissions

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Area of Science:

  • Biomedical Engineering
  • Wireless Power Transfer
  • Implantable Devices

Background:

  • Conventional inductive links struggle with simultaneous wireless power and data transmission in implantable devices due to power carrier interference.
  • The strong power carrier can overwhelm uplink data signals and saturate external receivers, limiting device functionality.

Purpose of the Study:

  • To propose and evaluate a novel magnetic-balanced inductive link for implantable glaucoma treatment devices.
  • To overcome the limitations of conventional two-coil systems by minimizing power carrier interference for improved data transmission.

Main Methods:

  • A new magnetic-balanced inductive link employing an additional coil for uplink receiving was designed.
  • Balanced cancellation of the external power coil's magnetic field minimizes interference.
  • Separate carriers (2-MHz for power, 500-kHz for uplink data) were utilized.

Main Results:

  • Achieved a 65.72 dB improvement in signal-to-interference ratio (SIR) compared to conventional links.
  • Demonstrated low power consumption (0.2 mW) for transmitting 50 kbps data with a bit error rate of 1 × 10⁻⁷.
  • Delivered 5 mW to the load with a maximum power transfer efficiency of 58.8% under ultra-weak coupling (k=0.005).

Conclusions:

  • The magnetic-balanced inductive link effectively mitigates power carrier interference in implantable biomedical sensor devices.
  • This technology enables reliable, simultaneous wireless power and data transmission for small-sized devices under challenging coupling conditions.
  • The proposed link is highly suitable for advanced implantable glaucoma treatment systems and other miniaturized biomedical applications.