Resonant Wireless Power Transfer Over Mid-Range Distances
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Solution Overview
Problem
Current wireless energy transfer methods are inefficient for transferring useful amounts of electrical power over mid-range distances and alignment offsets, as traditional induction schemes are limited by short range and require precise alignment, while radiative methods are inefficient and pose hazards.
Innovation Solution
The use of coupled electromagnetic resonators with long-lived oscillatory resonant modes to transfer power wirelessly, where resonators are designed to mediate energy exchange primarily through magnetic or electric near-fields, enabling efficient energy transfer over mid-range distances with minimal losses and alignment flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional induction schemes are used for wireless energy transfer, then power transfer is achieved over very short distances, but alignment precision requirements are extremely strict and transfer distance is severely limited
Solution Approach 1:
The patent applies resonant oscillation principles to both transmitting and receiving coils, tuning them to the same resonant frequency. This resonance coupling creates a strongly coupled oscillating magnetic field that extends the effective transfer distance from millimeters to meters, while maintaining efficient power transfer without requiring precise alignment like traditional induction schemes
Solution Approach 2:
The patent changes the operating parameters by using high-Q resonant coils tuned to specific frequencies (e.g., 6.78 MHz ISM band). By adjusting the resonant frequency and quality factor of the coils, the system achieves extended transfer distance and relaxed alignment requirements compared to conventional low-frequency induction methods
2Length of stationary object
If radiative wireless energy transfer methods are used, then transfer distance is extended, but energy loss increases significantly and safety hazards arise
Solution Approach 1:
The patent uses resonant oscillation at specific frequencies to create strongly coupled magnetic fields between transmitting and receiving coils. This resonant coupling confines the magnetic field to the near-field region, enabling extended transfer distance while maintaining high efficiency and avoiding the energy losses and safety hazards associated with far-field radiative methods
Solution Approach 2:
The patent introduces a resonant magnetic field as an intermediary between the transmitting and receiving coils. This oscillating magnetic near-field acts as a mediator that efficiently couples energy over mid-range distances without requiring direct contact (like induction) and without radiating energy into free space (like traditional wireless methods), thus reducing energy loss and eliminating safety hazards
3Loss of energy
If radiative directional antennas are used to improve transfer efficiency, then energy directionality is improved, but system complexity increases due to tracking and steering mechanisms
Solution Approach 1:
The patent uses resonant oscillation to create a strongly coupled magnetic field that naturally concentrates energy transfer between the transmitting and receiving coils. This resonance-based approach achieves high transfer efficiency without requiring directional antennas, tracking mechanisms, or steering systems, thereby maintaining simple system architecture while improving energy efficiency
4Power
If traditional induction schemes are used, then power transfer is achieved, but transfer distance is limited to very short ranges
Solution Approach 1:
The patent applies resonant oscillation principles to both transmitting and receiving coils, tuning them to the same resonant frequency. This resonance coupling creates a strongly coupled oscillating magnetic field that extends the effective transfer distance from millimeters (traditional induction) to meters, while maintaining efficient power transfer capability
Solution Approach 2:
The patent changes the operating parameters by using high-Q resonant coils tuned to specific frequencies. By adjusting the resonant frequency and quality factor, the system achieves extended transfer distance and maintains high power transfer capability that cannot be achieved with conventional low-frequency induction methods
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 allows for efficient wireless energy transfer over distances of several centimeters to meters, achieving higher power levels from picowatts to kilowatts, with improved efficiency and tolerance to alignment offsets compared to traditional methods.
Implementation Method 1
a source resonator having a Q-factor Q1 and a characteristic size x1, coupled to a power generator with direct electrical connections; and a second resonator having a Q-factor Q2 and a characteristic size x2, coupled to a load with direct electrical connections, and located a distance D from the source resonator, wherein the source resonator and the second resonator are coupled to exchange energy wirelessly
Implementation Method 2
coupled electromagnetic resonators with long-lived oscillatory resonant modes to transfer power wirelessly
Data Source
AI summary
Described herein are improved configurations for providing a stranded printed circuit board trace comprising, a plurality of conductor layers, a plurality of individual conductor traces on each of the said conductor layers, and a plurality of vias for connecting individual conductor traces on different said conductor layers, the vias located on the outside edges of the stranded trace. The individual conductor traces of each layer may be routed from vias on one side of the stranded printed circuit board trace to vias on the other side in a substantially diagonal direction with respect to the axis of the stranded printed circuit board trace. In embodiments, the stranded printed circuit board trace configuration may be applied to a wireless power transfer system.