Feed Line Integrated Filtering for Inductive Power Transfer
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Solution Overview
Problem
Inductive power transfer (IPT) systems for wireless charging of electric vehicles face efficiency losses and reliability issues due to unwanted frequencies generated by the resonant tank circuitry and components, leading to heat generation and electromagnetic interference, which complicates system design and reliability, especially in compact and space-constrained applications.
Innovation Solution
Integration of a feed line with filtering components, including at least one inductor and capacitor, to attenuate unwanted frequencies, thereby reducing harmonic generation and improving system efficiency by minimizing reactive power reflection and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional filtering circuitry is added to reduce unwanted frequencies, then system efficiency and reliability improve, but device complexity and size increase
Solution Approach 1:
The patent combines the filtering function with the existing feed line by integrating inductor and capacitor components directly into the feed line structure. This merging approach eliminates the need for separate filtering circuits, thereby improving reliability through effective frequency attenuation while avoiding increased device complexity
Solution Approach 2:
The feed line is designed to serve multiple functions simultaneously: power transmission and frequency filtering. By making the feed line multi-functional, the patent achieves unwanted frequency attenuation without adding dedicated filtering components, thus improving reliability while maintaining simplicity
2Productivity
If resonant tank circuitry is used for wireless power transfer, then power transfer efficiency improves, but unwanted harmonic frequencies are generated causing heat and EMI
Solution Approach 1:
The patent converts the harmful harmonic frequencies generated by resonant tank circuitry into a manageable issue by integrating filtering components into the feed line. The inductor and capacitor work together to attenuate these unwanted frequencies, transforming the harmful effect into a controlled situation while maintaining the benefits of resonant power transfer
Solution Approach 2:
The integrated inductor and capacitor in the feed line act as intermediaries between the resonant tank circuitry and the load. These components mediate the power transmission by allowing efficient power transfer while simultaneously attenuating harmful harmonic frequencies, thus resolving the contradiction between productivity and harmful factors
3Device complexity
If feed line length is increased to reduce complexity, then integration of filtering components becomes more difficult, but system flexibility improves
Solution Approach 1:
The patent merges the filtering components with the feed line itself, making the filtering function independent of feed line length. This integration approach allows filtering to be effectively implemented regardless of whether the feed line is short or long, thus reducing overall system complexity without being constrained by feed line dimensions
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 integrated filtering in the feed line effectively attenuates unwanted frequencies, enhancing the efficiency and reliability of IPT systems by reducing heat and electromagnetic interference, thus improving long-term performance and safety while maintaining a compact design.
Implementation Method 1
the integrated filter includes at least one inductor and at least one capacitor
Implementation Method 2
the integrated filter includes at least one inductor and at least one capacitor
Implementation Method 3
An alternating current in the primary inductor produces a fluctuating magnetic field. When the secondary inductor is placed in proximity to the primary inductor, the fluctuating magnetic field induces an electromotive force (EMF) in the secondary inductor
Data Source
AI summary
Certain aspects of the present disclosure are generally directed to apparatus for attenuating unwanted frequencies using a feed line with integrated filtering. In certain aspects, a feed line for filtering unwanted frequencies in a wireless power transfer system is provided, the feed line including a first end, wherein the first end is configured to connect to a power source that generates a driving signal having a driving signal frequency, and a second end, wherein the second end is configured to connect to a wireless power transfer element configured to wirelessly transmit power. The feed line further includes a conductor core, wherein the conductor core is configured to transfer the driving signal from the power source to the wireless transfer element. The feed line further includes an integrated filter configured to attenuate at least one frequency generated by the wireless power transfer system.