Integrated Coil-Capacitor Resonance for Longer Airgap WPT
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Solution Overview
Problem
Conventional wireless power transfer systems struggle with effective power transfer over long distances due to limited airgap between transmitter and receiver, leading to inefficiencies and reduced power transfer capability.
Innovation Solution
Integration of capacitors with coils in wireless power systems, forming a resonant component that includes electrodes at the ends of the coil windings with a dielectric sandwiched between, allowing for enhanced control over parasitics and improved efficiency, power density, and system footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If conventional inductive WPT with limited airgap (d≤D/4) is used, then power transfer efficiency is maintained, but transfer distance is restricted
Solution Approach 1:
The patent merges the coil and capacitor into a single integrated resonant component structure. The capacitor is formed using portions of the coil windings themselves as electrodes, with dielectric material positioned between adjacent winding sections. This integration creates a compact resonant circuit that maintains high power transfer efficiency while enabling extended airgap distances beyond conventional limits.
Solution Approach 2:
The patent changes the operating parameters by integrating resonant components directly into the coil structure, allowing the system to operate at resonant frequencies that enhance power transfer capability. This parameter change enables the system to maintain efficiency at distances where conventional non-resonant systems would fail.
2Length of stationary object
If discrete capacitors are added to coils for resonance, then power transfer distance improves, but device complexity increases
Solution Approach 1:
The patent combines the functions of the coil and capacitor into a single integrated component. The capacitor electrodes are formed directly from portions of the coil windings, eliminating the need for separate discrete capacitor components. This merging reduces device complexity while maintaining the resonant functionality needed for extended power transfer distance.
Solution Approach 2:
The coil structure serves multiple functions simultaneously: it provides the inductive element for power transfer and contains portions that form the capacitive elements for resonance. This multi-functionality eliminates the need for separate dedicated capacitor components, simplifying the overall system structure.
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
Enhances power transfer efficiency and distance by mitigating losses and inefficiencies, enabling high-frequency wireless charging systems to transmit power over extended distances with improved robustness against frequency and load variations.
Implementation Method 1
a first capacitor that includes first Cu plates located at the ends of the primary coil's Cu-foil winding and a dielectric sandwiched between the first Cu plates
Implementation Method 2
a primary-side resonant-tuning network (RTN) that is integrally formed with the primary coil
Implementation Method 3
a primary coil configured to wirelessly transmit the high-frequency AC power... a secondary coil configured to receive the high-frequency AC power when the secondary coil and the primary coil are disposed adjacent to each other and spaced apart through a gap d
Data Source
AI summary
A component for wireless power transfer is provided with tuning capacitors integrated with coils. For instance, a single turn coil can be split into two halves and capacitance (other than self-capacitance) may be implemented by introducing a dielectric layer between portions of the two half turns.