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Related Concept Videos

Maximum Power Transfer01:16

Maximum Power Transfer

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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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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Mutual Inductance01:24

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Inductance is the property of a device that tells us how effectively it induces an emf in another device. In other words, it is a physical quantity that expresses the effectiveness of a given device.
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Induced Electric Fields01:23

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The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...
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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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A Q-Modulation Technique for Efficient Inductive Power Transmission.

Mehdi Kiani1, Byunghun Lee2, Pyungwoo Yeon2

  • 1Electrical Engineering Department at the Pennsylvania State University, University Park, PA 16802, USA.

IEEE Journal of Solid-State Circuits
|April 19, 2016
PubMed
Summary
This summary is machine-generated.

This study introduces Q-modulation, an adaptive power management technique for efficient inductive power transmission. It maintains high power transfer efficiency across varying loads and distances, crucial for devices like implants and EVs.

Keywords:
Q-modulationbattery chargingelectric vehiclesimplantable microelectronic devicesinductive linkspower managementwireless power transmission

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Area of Science:

  • Electrical Engineering
  • Power Electronics
  • Microelectronics

Background:

  • Inductive power transfer (IPT) systems face efficiency challenges due to load and coupling variations.
  • Maintaining high power transfer efficiency (PTE) is critical for applications like implantable microelectronic devices (IMDs), mobile electronics, and electric vehicles.

Purpose of the Study:

  • To present a fully-integrated power management application-specific integrated circuit (ASIC) for efficient inductive power transmission.
  • To introduce and validate the Q-modulation technique for adaptive load matching and maintaining high PTE in IPT systems.

Main Methods:

  • Developed a Q-modulation adaptive scheme that detects receiver (Rx) LC-tank current zero-crossings.
  • Employed a low-loss switch to chop the Rx LC-tank, forming a high-quality factor (Q) LC-tank for energy storage and transfer.
  • Adjusted the duty cycle (D) to dynamically modulate the loaded-Q of the Rx LC-tank, compensating for load resistance (R) variations.

Main Results:

  • Fabricated a Q-modulation power management (QMPM) prototype chip in a 0.35-μm standard CMOS process (4.8 mm²).
  • In a 1.45 W wireless power transfer setup at 2 MHz, the QMPM prototype demonstrated significant improvements.
  • Achieved a 98.5% increase in inductive link PTE and a 120.7% increase in overall power efficiency at 8 cm coupling distance, compensating for a 150 Ω load variation.

Conclusions:

  • Q-modulation is a highly effective adaptive scheme for load matching in inductive power links.
  • The QMPM chip successfully enhances power transfer efficiency and overall system efficiency across a wide range of operating conditions.
  • This technology holds significant promise for improving the performance and practicality of wireless power transfer in various applications.