Capacitor-Compensated Litz Wire for Uniform Inductive Charging
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Solution Overview
Problem
The use of Litz wire in inductive charging systems for electric vehicles leads to heterogeneous current distribution and additional losses due to induced impedance, reducing energy efficiency and causing premature wear.
Innovation Solution
A Litz wire design with stranded or braided electrical conductors, combined with capacitors in series to compensate for impedance differences, ensuring homogeneous current distribution and reducing losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Litz wire is used to reduce skin effect losses, then charging efficiency is improved, but heterogeneous current distribution causes premature wear
Solution Approach 1:
The patent modifies the electrical parameters by adding series capacitance to each conductor, which equalizes the impedance and ensures uniform current distribution, preventing localized overheating and premature wear while maintaining high charging efficiency
2Loss of energy
If capacitors are added in series with each conductor, then current distribution is homogenized, but device complexity increases
Solution Approach 1:
The patent applies homogeneity by using identical capacitor values for each conductor in the Litz wire, creating uniform impedance characteristics across all conductors. This standardized approach simplifies the design process and component selection while achieving the goal of homogeneous current distribution
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 solution achieves improved energy efficiency and reduced wear by balancing current distribution across the conductors, minimizing impedance differences and associated losses.
Implementation Method 1
capacitors respectively arranged in series with the conductors, the capacitors being configured to compensate for differences between the respective impedances of the electrical conductors
Implementation Method 2
The Litz wire has the advantage of reducing losses due to a phenomenon known as the 'skin effect.'
Implementation Method 3
Coils are used to transfer energy via a magnetic field
Data Source
Figure 1
Figure 2
Figure 3(a)~3(b)
AI summary
The invention relates to a device (2) for transferring electrical energy, comprising: a Litz wire (20) comprising electrical conductors (22) stranded or braided together, the Litz wire (20) being wound about itself to form a winding (6) capable of forming a magnetic coupler (3) with another winding (8); capacitors (C T1 , C T2 , C T3 ) respectively arranged in series with the conductors (22), the capacitors (CT T1 , C T2 , C T3 ) being configured to compensate for differences between the respective impedances of the electrical conductors (22).