Dielectric Materials for Contactless Power Transfer Efficiency
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Solution Overview
Problem
Existing contactless power transfer systems face inefficiencies due to weak magnetic field coupling at distances greater than a few millimeters and sensitivity to load and misalignment variations, with a need for materials with high dielectric properties and low dielectric loss factors to enhance power transfer efficiency.
Innovation Solution
A contactless power transfer system utilizing a field-focusing element with self-resonant coils and dielectric materials having high dielectric constants and low loss tangents, such as calcium copper titanate and barium strontium titanate, to focus magnetic fields and maintain efficiency across varying distances and load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electromagnetic induction method is used for contactless power transfer, then power can be transferred without interconnecting wires, but coupling between coils becomes weak at distances greater than a few millimeters
Solution Approach 1:
The patent introduces a dielectric material as an intermediary substance positioned between the primary and secondary coils. This dielectric material serves as a mediator that enhances magnetic field coupling across the air gap, enabling effective contactless power transfer at distances greater than a few millimeters while maintaining strong coupling.
Solution Approach 2:
The patent changes the physical parameters of the medium between coils by introducing materials with specific dielectric properties (high dielectric constant, low loss tangent). This parameter change transforms the electromagnetic field distribution and enhances coupling efficiency at extended distances.
2Loss of energy
If resonant inductive coupling is used to increase power transfer efficiency, then efficiency improves at resonant frequency, but the system becomes sensitive to load and gap variations
Solution Approach 1:
The patent employs composite dielectric materials combining high dielectric constant properties with low loss tangent characteristics. This composite material approach maintains high power transfer efficiency across varying loads and gaps while reducing the system's sensitivity to these variations through the material's inherent electromagnetic field management properties.
3Ease of operation
If air gap between coils is increased for contactless transfer, then contactless operation is achieved, but magnetic field coupling and transfer efficiency are reduced
Solution Approach 1:
The dielectric material acts as an intermediary that bridges the air gap between coils, maintaining strong magnetic field coupling even when the physical distance between coils is increased for contactless operation. This mediator prevents efficiency loss despite the larger separation distance.
Solution Approach 2:
By changing the electromagnetic parameters of the medium between coils through dielectric material introduction, the system maintains high power transfer efficiency at increased coil separations, effectively decoupling the relationship between gap distance and efficiency.
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
The system achieves robust and efficient power transfer with reduced sensitivity to load variations and misalignment, enabling operation over longer distances with high coupling efficiency and stability across a wide frequency range.
Implementation Method 1
The use of materials having high dielectric properties and low dielectric loss factors enhances the efficiency of contactless power transfer systems
Implementation Method 2
an electromagnetic induction method that works on the principle of a primary transformer coil generating a dominant magnetic field and a secondary transformer coil in the vicinity of the primary transformer coil generating a corresponding voltage
Implementation Method 3
Transmitter and receiver elements resonate at the same frequency, and maximum induction occurs at the resonant frequency
Data Source
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AI summary
A contactless power transfer system is proposed. The power transfer system comprises a field-focusing element comprising a dielectric material. The dielectric material comprises a composition that is selected from the family of (Ba,Sr)TiO3 or CaCu3Ti4O12. The compositions of the (Ba, Sr)TiO3 include the materials such as Ca1-x-yBaxSryTi1-zCrzO3-δNp, wherein 0 < x < 1; 0 < y < 1; 0 ≤ z ≤ 0.01; 0 ≤ δ ≤ 1; and 0 ≤ p ≤ 1. The compositions of the CaCu3Ti4O12 include the materials such as Ca1-x-yBaxSry (Ca1-zCuz)Cu2Ti4-δAlδO12-0.5δ, wherein 0 ≤ x< 0.5; 0 ≤ y < 0.5; 0≤ z ≤ 1; and 0 ≤ δ ≤ 0.1.