Wireless Power Transfer Range Extension with Relay Coils and EMI Control
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Solution Overview
Problem
Current wireless power transfer systems face challenges in efficiently transferring power over extended distances and volumes due to decreased mutual inductance, increased electromagnetic interference, and heat generation, which limits their effectiveness and reliability, especially in harsh environments and multi-device charging scenarios.
Innovation Solution
The system incorporates custom-shaped components with magnetic materials to concentrate and redirect magnetic fields, combined with advanced firmware and thermal management features to maintain efficient power transfer at longer ranges and volumes, while reducing electromagnetic interference and heat buildup.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If transmitter inductance and/or receiver inductance are increased to counteract coupling decrease at larger distances, then wireless power transfer capability at larger distances is improved, but equivalent series resistance increases causing more heat and greater energy losses
Solution Approach 1:
The system divides the wireless power transfer into multiple segments by introducing intermediate transmitting elements (relay coils) between the primary transmitter and receiver. Each segment operates at optimized coupling distances, preventing the need for excessive inductance in single long-distance links. This segmentation allows each coil pair to operate at optimal inductance values while achieving extended overall range through cascaded power transfer.
Solution Approach 2:
Intermediate transmitting elements serve as mediators that receive power wirelessly from the primary transmitter and re-transmit it to the receiver. These intermediary coils enable power transfer across gaps that would be too large for direct coupling, maintaining efficient energy transfer without requiring prohibitively high inductance values in the end-to-end system.
2Length of moving object
If transmitter inductance and/or receiver inductance are increased to counteract coupling decrease at larger distances, then wireless power transfer capability at larger distances is improved, but heat generation increases
Solution Approach 1:
By segmenting the power transfer path into multiple shorter segments with intermediate coils, each operating at optimal coupling, the system avoids the exponential heat generation that would result from using excessively high inductance in a single long-distance link. The thermal load is distributed across multiple components rather than concentrated in one overheating coil.
Solution Approach 2:
Intermediary transmitting elements act as thermal buffers, receiving and re-transmitting power in small steps that generate manageable heat at each stage. This prevents the runaway heat generation that would occur in a direct long-distance transfer system requiring extreme inductance values.
3Length of moving object
If designs transmit power effectively at larger distances, then wireless charging range is extended, but electromagnetic interference increases
Solution Approach 1:
The system segments the electromagnetic field path into multiple controlled segments, each with manageable field strengths. Intermediate coils re-generate the magnetic field at each stage rather than requiring one extremely strong field to span the entire distance, thereby reducing cumulative EMI while maintaining power transfer capability.
Solution Approach 2:
Intermediary coils serve as EMI isolation barriers, confining strong magnetic fields to short distances between adjacent coils. This prevents the propagation of high-intensity electromagnetic interference across the entire transmission path, as each intermediate element resets and re-confines the field locally.
4Reliability
If devices are positioned within a charging bay or in contact with the charging bay, then charging efficiency is maintained, but charging of over-sized devices is precluded
Solution Approach 1:
The system transitions from planar contact-based charging to three-dimensional wireless power transfer with vertical stacking capability. Multiple transmitting bays can be arranged in vertical or spatial configurations, allowing devices of various sizes and shapes to be charged without requiring flat surface contact, thereby accommodating oversized devices while maintaining charging efficiency.
Solution Approach 2:
The wireless charging bay system is designed with universal transmitting elements that can charge multiple device types and sizes simultaneously. The segmented architecture allows flexible configuration of multiple transmitting coils that can service different device form factors, making the system adaptable to various device dimensions while maintaining reliable power transfer.
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 enables more efficient and reliable wireless power transfer over extended distances and volumes, maintaining performance without excessive heat rise, and supports multiple devices with reduced electromagnetic interference and cost.
Implementation Method 1
Inductive wireless power transfer occurs when magnetic fields created by a transmitting element induce an electric field, and hence electric current, in a receiving element.
Implementation Method 2
A transmitting element comprises a coil and a magnetic material, wherein the magnetic material reshapes a magnetic field generated by the coil
Data Source
AI summary
The present application relates to an apparatus which comprises a wireless power transfer (WPT) system. This system comprises features which allow it to transfer more power wirelessly at extended distances than other systems operating in the same frequency range. The system possesses heat dissipation features; these features allow it to operate effectively in elevated-temperature environments, and to transfer power at higher levels and/or greater distances than a typical power-transfer system. The system also might include design features to withstand mechanical shocks, stresses, and impacts for use in a rugged environment. The system can also comprise adaptations to reduce electromagnetic interference (EMI), and can comprise specially shaped components with magnetic/ferrimagnetic properties that enhance performance. Other potential features include power conditioning by combining, within one circuit or one board, multiple elements that protect against excessive current, over-voltage, and/or reverse voltage. Other features might include integration of an antenna and a battery within one module.