Wireless Power Transfer Intermediate Coil Inductance
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Solution Overview
Problem
Current wireless power transmission systems face inefficiencies due to high resistance components at the primary side, leading to significant power loss and limited coupling between the primary and secondary coils, especially when using multi-coil resonators with additional intermediate coils that do not effectively interact across a distance.
Innovation Solution
The system incorporates at least two intermediate coils coupled with a predetermined turn ratio to the source coil, increasing the effective inductance and coupling coefficient, and utilizes resonance capacitors and circuitry to optimize the operational frequency, resulting in a boosted inductance and enhanced power transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-coil resonator with intermediate coils is used, then the coupling between primary and secondary sides is improved, but the system complexity increases
Solution Approach 1:
The patent implements a nested coil configuration where intermediate coils are positioned inside the primary coil, creating a multi-layer nested structure. This nesting arrangement maximizes the coupling coefficient by optimizing magnetic flux linkage between coils while maintaining a compact physical footprint, thereby improving reliability without proportionally increasing device complexity.
Solution Approach 2:
The intermediate coils serve as magnetic field intermediaries that facilitate energy transfer between the primary and secondary coils. By introducing these intermediary elements, the system achieves enhanced coupling coefficients through improved magnetic flux distribution, resolving the contradiction between reliability improvement and system complexity.
2Loss of energy
If resistance components are reduced at the primary side, then power loss is decreased, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs parameter optimization by carefully selecting and tuning the resistance values of components at the primary side. Through systematic parameter adjustment and optimization, the design achieves reduced power loss while maintaining manufacturability, balancing energy efficiency requirements with practical manufacturing precision capabilities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration significantly increases the power transmission efficiency by reducing wire resistance and enhancing the coupling coefficient, leading to more stable and efficient energy transfer between the primary and secondary sides, while maintaining system stability and reducing output voltage fluctuations.
Implementation Method 1
an AC electromagnetic field is generated at a primary side (i.e., charger) using an induction coil
Implementation Method 2
A wireless power transmission system according to an exemplary embodiment of the present invention includes: a source coil at a primary side; a load coil at a secondary side; and at least two intermediate coils coupled with each other in an insulated manner with a predetermined turn ratio with respect to the source coil
Data Source
AI summary
A wireless power transmission system according to an exemplary embodiment of the present invention includes: a source coil at a primary side; a load coil at a secondary side; and at least two intermediate coils coupled with each other in an insulated manner with a predetermined turn ratio with respect to the source coil. An effective inductance of the source coil is increased by the at least two intermediate coils and thus a coupling coefficient between the source coil and the load coil is increased.