This research project uses resonant inductive coupling to transfer power wirelessly. It uses a low power supply to transmit power. The scope of this study is limited to the construction of a simplified WPT system using a resonant coupled inductor system. This study includes the matching sections, derivation of relationship between the coupling coefficient and distance and the parameters (quality factor, coupling coefficients, mutual inductance, resonance frequency) of the resonators. The researcher uses a 12V, 5W CYD LED bulb as the load to be able to distinguish easily whether the system is operating well or not. This study will not cover other possible methods in improving the efficiency of a wireless power.
Wireless power transfer based on coupled magnetic resonances is a new technology in which energy can be transferred via coupled magnetic resonances in the non-radiative near-field. This paper presents the design, simulation, fabrication, and experimental characterization of a single-loop inductor that acts as the receiver and transmitter of the system. A circuit model is presented to provide a convenient reference for the analysis of the transfer characteristics of a magnetically coupled resonator system. Based on this structure, the output voltage in the receiving loop is related to different transfer distances and orientations. A given driving frequency was simulated and analyzed. The driving resonant frequency of the system is approximately 580 kHz.
Table of Contents
1. Introduction
2. Methodology
3. Conceptualization/Development of System Design
3.1 System Block Diagram
3.2 Power Supply
3.3 Amplifier
3.4 Transmitter and Receiver Loops
3.5 Voltage Rectifier
3.6 Circuit Model and Transfer System
3.7 Equivalent Circuit Parameter
3.8 Experimental Results and Validation
3.9 System Efficiency
3.10 Voltage Patterns as a Function of Angular Displacements
3.11 Testing at Different Frequencies
4. Conclusion
Objectives and Topics
The primary objective of this research is to design, model, and experimentally characterize a resonant coupled inductor system for wireless power transfer, focusing on achieving high efficiency and analyzing performance across varying distances and orientations.
- Design and simulation of a resonant wireless power transfer system.
- Analysis of power transfer efficiency as a function of distance between resonant loops.
- Characterization of the impact of coil orientation and misalignment on power coupling.
- Verification of resonant frequency parameters and quality factor optimization.
Excerpt from the Book
System Efficiency
The power transfer efficiency, which describes the direct energy transfer between the transmitter and receiver coils, as discussed in equation 3.8, is measured as the ratio of the power received in the receiver coil to the power sent out from the transmitter coil. The table and graph below shows that the lesser the distance, the greater in the efficiency. Hence, greater distance between the transmitting and the receiving coils given lower efficiency. It is further observed from the graph there is a limiting distance of the two coils. This is the distance where the graph crossed the zero efficiency line.
Summary of Chapters
1. Introduction: This chapter highlights the rising demand for efficient, cable-free charging solutions for mobile devices and establishes the potential of electromagnetic resonance couplings.
2. Methodology: This section details the procedural steps, including hardware/software design, circuit assembly, testing, and the integration of experimental variables like distance and resonant frequency.
3. Conceptualization/Development of System Design: This comprehensive section covers the block diagrams, power supply schematics, amplifier design, and the mathematical modeling of the resonant coupled inductors.
4. Conclusion: This final chapter summarizes the feasibility of magnetic resonance coupling for wireless power transfer and reaffirms the inverse relationship between distance and system efficiency.
Keywords
Wireless Power Transfer, Coupled Magnetic Resonance, Resonance Frequency, Inductive Coupling, Resonant Coupled Inductor, Power Transfer Efficiency, Circuit Modeling, Electromagnetic Resonance, Near-field Coupling, Voltage Gain, Resonators, Coil Misalignment, Simulation, Multisim, Transmission Specification
Frequently Asked Questions
What is the core focus of this research paper?
The paper focuses on the characterization and design of a resonant coupled inductor system to facilitate efficient wireless power transfer.
What are the primary technical areas addressed in this study?
Key topics include system design, circuit modeling, simulation of resonant frequencies, and experimental verification of power transfer efficiency.
What is the main objective or research question?
The study aims to characterize a resonant coupled inductor system by designing a model, simulating it, and determining the effective transmission distance for varying power levels and orientations.
Which scientific methodology is employed?
The research uses a methodical approach involving hardware development, Multisim software simulations, and empirical testing to establish the relationship between coil distance and energy transfer efficiency.
What topics are covered in the main body (Chapter 3)?
The main body details the system architecture—including power supplies, amplifiers, and rectifiers—as well as the mathematical circuit model and the results of various experimental measurements.
Which keywords best characterize this work?
Core keywords include Wireless Power Transfer, Coupled Magnetic Resonance, Inductive Coupling, Resonant Frequency, and Electromagnetic Resonance.
How do obstacles affect the system's performance?
The experimental results show that non-metallic objects like walls, leather, and wood have no significant impact on the power transfer efficiency.
What is the role of frequency splitting in this system?
Frequency splitting is identified as an issue that can substantially reduce system efficiency when resonant frequencies deviate, necessitating precise tuning.
What impact does distance have on power transfer?
Efficiency varies inversely with the square of the distance between the transmitter and receiver loops; as distance increases, both transfer power and efficiency decline.
Why are the resonant frequencies critical to the system's design?
Operating exactly at the resonance frequency is essential to achieving maximum power transfer efficiency, as the system is tuned to work within medium to high-frequency ranges.
- Citation du texte
- Alan Nebrida (Auteur), 2022, Characterization of Resonant Coupled Inductor in a Wireless Power Transfer System, Munich, GRIN Verlag, https://www.grin.com/document/1271343
