Wireless Power Antenna With Internal Repeater for Uniform Charge Areas
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in achieving uniform power transmission over large areas, particularly when the receiver is in motion, due to variations in the strength of the emitted field, and often require more conductive materials which increase costs and environmental concerns.
Innovation Solution
The design of wireless power transmission systems with internal repeaters and inter-turn capacitors to enhance uniformity ratio and metal resiliency, using a configuration where current directions in the source and repeater coils reverse from turn to turn, and incorporating a repeater filter circuit to reduce electromagnetic interference and sensitivity to parasitic capacitances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If more conductive materials (coils, turns, resonant bodies) are used to enhance uniformity ratio, then uniformity of power transmission is improved, but cost and environmental impact increase
Solution Approach 1:
The transmission antenna is divided into multiple source coils and internal repeater coils, each contributing to the overall uniform field distribution. This segmentation allows achieving uniformity without requiring excessive conductive material in a single large coil structure.
Solution Approach 2:
Internal repeater coils are introduced as intermediary elements that receive power from source coils and re-transmit it, enhancing field uniformity across the charge area without requiring a proportional increase in total conductive material.
2Stability of the object's composition
If internal repeater coils are added to improve uniformity, then power transmission uniformity is enhanced, but device complexity increases
Solution Approach 1:
The source coils and internal repeater coils are merged into a unitary transmission antenna structure, sharing common magnetic cores and integrated circuit board mounts, which reduces overall structural complexity despite the addition of repeater elements.
Solution Approach 2:
The internal repeater coils serve multiple functions: they extend the charge area, enhance field uniformity, and provide redundant power transmission paths, justifying their inclusion without proportionally increasing complexity.
3Object-affected harmful factors
If repeater filter circuit is incorporated to reduce EMI, then electromagnetic interference is minimized, but device complexity increases
Solution Approach 1:
The repeater filter circuit extracts and removes harmful electromagnetic interference and parasitic capacitance effects from the repeater coil circuit, allowing the use of internal repeaters without introducing excessive EMI into the system.
4Stability of the object's composition
If current directions reverse from turn to turn in source and repeater coils, then uniformity and metal resiliency are improved, but manufacturing precision requirements increase
Solution Approach 1:
The current direction reverses asymmetrically from turn to turn in the source and repeater coils, creating a specific field pattern that enhances uniformity and metal resiliency. This asymmetric current distribution is achieved through the winding configuration and circuit connectivity rather than requiring precise external control.
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 achieves improved uniformity and resilience in power transmission, reducing the need for additional conductive materials and minimizing electromagnetic interference, while maintaining efficient power transfer across a large area with dynamic receiver positions.
Implementation Method 1
inductive and/or resonant inductive wireless power transfer, which occurs when magnetic fields created by a transmitting element induce an electric field and, hence, an electric current, in a receiving element
Implementation Method 2
an internal repeater coil comprised of a second conductive wire, the internal repeater coil including a second outer turn and a second inner turn, the internal repeater coil configured to have a repeater current induced in the second outer turn and the second inner turn
Implementation Method 3
incorporating a repeater filter circuit to reduce electromagnetic interference and sensitivity to parasitic capacitances
Data Source
AI summary
An antenna for wireless power transmission includes a source coil comprised of a first conductive wire, the source coil including a first outer turn and a first inner turn, the source coil configured to connect to one or more electronic components for wireless power transfer. The antenna further includes an internal repeater coil comprised of a second conductive wire, the internal repeater coil including a second outer turn and a second inner turn, the internal repeater coil configured to have a repeater current induced in the second outer turn and the second inner turn. The antenna further includes a repeater filter circuit connected between a beginning of the second outer turn and an ending of the second inner turn, the repeater filter circuit comprising an LC filter and introducing a filter impedance to the internal repeater coil.