Wireless Power Receiver Coil with Internal Repeater for Uniform Charging
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in achieving uniform power transmission over large areas, especially when the receiver is in motion, and they often require more conductive materials which increase costs and environmental concerns.
Innovation Solution
The design incorporates internal repeater coils with alternating current directions and a multi-layer multi-turn receiver coil configuration, along with a demodulation circuit for efficient signal processing, to enhance uniformity and metal resilience while minimizing conductive wire length and substrate use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more conductive materials and turns are used in transmission antennas to maximize uniformity ratio, then uniformity of power transmission is improved, but cost and environmental impact worsen
Solution Approach 1:
The transmission antenna is divided into multiple segments or zones with different conductive material densities. High-uniformity regions use more turns and conductive materials, while low-priority regions use fewer turns, achieving overall uniformity without maximizing material use across the entire antenna.
Solution Approach 2:
Different regions of the transmission antenna are designed with locally optimized properties. Areas requiring higher uniformity (such as central charging zones) are enhanced with additional turns and conductive materials, while peripheral areas use minimal materials, creating a non-uniform antenna structure that achieves uniform power distribution.
2Reliability
If internal repeater coils are added to enhance uniformity and extend charge area, then power transmission uniformity is improved, but device complexity increases
Solution Approach 1:
Internal repeater coils are nested within the existing antenna structure, with repeater coils positioned inside the main transmission antenna windings. This nested configuration allows the repeater coils to be integrated into the antenna's magnetic field without requiring separate external structures, thereby extending the charge area while minimizing additional complexity.
3Area of stationary object
If receiver coil is made larger to receive power over large charge area, then charging area coverage is improved, but coupling consistency worsens
Solution Approach 1:
The receiver coil is divided into multiple smaller coil segments arranged in a distributed pattern across the charging surface. Each segment independently couples with the transmission antenna, and their combined effect provides wide area coverage while maintaining consistent coupling strength through the distributed arrangement.
Solution Approach 2:
The receiver coil transitions from a single planar loop to a three-dimensional distributed array of coil segments at different positions and orientations. This spatial distribution across multiple dimensions allows the receiver to maintain consistent coupling with the transmission antenna while covering a large charge area.
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 approach achieves improved uniformity and resilience in wireless power transmission over large areas, reducing electromagnetic interference and costs, and allows for efficient data signal detection even with varying receiver positions and orientations.
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
magnetic fields created by a transmitting element induce an electric field and, hence, an electric current, in a receiving element
Data Source
AI summary
An antenna for a wireless power receiver system includes a receiver coil, the receiver coil configured to receive one or both of wireless power signals and repeated wireless power signals and provide the wireless power signals to a rectifier of the wireless power receiver system. The antenna further includes an internal repeater coil, the internal repeater coil configured to receive the wireless power signals and transmit the wireless power signals to the receiver coil as the repeated wireless power signals.