Wireless Charging Resonators and Ferromagnetic Layer
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Solution Overview
Problem
Existing wireless charging devices suffer from inefficiencies such as magnetic field dissipation at the edges, overconsumption of energy, and high costs due to the use of multiple emitting antennas and high-current switches, as well as additional layers of antennas which increase costs.
Innovation Solution
A charging device with a layer of ferromagnetic material and resonators placed beneath the emitting antennas, where the resonators are activated or deactivated based on the position of the receiving antenna to optimize magnetic field direction and reduce unnecessary field emission, using low-current switches and eliminating unnecessary emitting antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple emitting antennas are used to cover the charging surface, then the charging area is improved, but the device complexity and cost increase
Solution Approach 1:
The charging surface is divided into multiple zones, each served by a dedicated emitting antenna. The control system segments the charging task by detecting the portable element's position and activating only the antenna corresponding to that zone, thereby maintaining comprehensive coverage while reducing the number of simultaneously active antennas and associated complexity.
Solution Approach 2:
The system dynamically selects which emitting antenna to activate based on the real-time position of the portable element. Instead of having all antennas permanently active or fixed in configuration, the system adapts the antenna activation state according to the detected position, optimizing the charging process and reducing unnecessary complexity.
2Area of stationary object
If emitting antennas are placed at the edges of the charging surface, then the charging coverage is improved, but magnetic field dissipation increases
Solution Approach 1:
The control system applies local quality by detecting the portable element's position and activating only the emitting antenna that corresponds to that specific location. This ensures that magnetic field energy is concentrated where needed rather than being dissipated across the entire charging surface, particularly at the edges where field strength naturally diminishes.
Solution Approach 2:
The system converts the potential harm of edge dissipation into a benefit by using position detection to intelligently select which antennas to activate. Rather than fighting the natural dissipation pattern, the system works with it by directing energy only to the zones where portable elements are actually present, thereby eliminating wasteful edge dissipation.
3Reliability
If high-current switches are used to control emitting antennas, then the reliability is improved, but the device cost increases
Solution Approach 1:
The invention extracts the high-current switching function from the antenna control system. By detecting the portable element's position and activating only one emitting antenna at a time, the system eliminates the need for high-current switches in parallel configurations. The extracted switching requirement is reduced to low-current control signals, thereby maintaining reliability while dramatically reducing cost and complexity.
Solution Approach 2:
Instead of providing full switching capability for all antennas simultaneously (excessive action), the system uses partial action by activating only the single antenna needed for the current charging task. This partial activation approach reduces the switching requirements from handling multiple high-current paths to managing a single low-current control signal, achieving the same reliability outcome with reduced cost.
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 solution reduces magnetic field dissipation, lowers the device's cost, and enhances charging efficiency by concentrating the magnetic field where needed, allowing for optimal charging regardless of the portable element's position and eliminating the need for additional emitting antennas and high-current switches.
Implementation Method 1
a layer of ferromagnetic material placed beneath the plurality of emitting antennas and having a surface at least substantially equal to the charging surface
Implementation Method 2
a plurality of resonators having a resonance frequency substantially equal to the emission frequency, placed between the plurality of emitting antennas and the charging surface, and covering an active surface at least substantially equal to the charging surface, suitable, when they are activated, for reflecting the magnetic field in the direction of the emitting antennas
Implementation Method 3
reflecting the magnetic field in the direction of the emitting antennas
Implementation Method 4
The magnetic field B is emitted at a determined frequency f which is the reception frequency of the receiving antenna Ar. The receiving antenna Ar receives this magnetic field B and the portable element 10 then converts the intensity of the magnetic field received by the receiving antenna Ar into a charging current
Data Source
AI summary
A device (20) for charging a portable element (10) having a receiving antenna (Ar) for charging by induction, the charging device (20) includes: a charging surface (Sc); a plurality of emitting antennas (A1, A3); a layer of ferromagnetic material (30) placed beneath the plurality of emitting antennas (A1, A3); an electronic circuit; a plurality of resonators (R1, R2 . . . Ri): having a resonance frequency substantially equal to the emission frequency of the antennas, placed between the plurality of antennas and the charging surface, and suitable, when they are activated, for reflecting the magnetic field (B) emitted by the antennas, and connected to the electronic circuit in order to be deactivated individually, according to a criterion of positioning of the receiving antenna relative to the resonators. An associated charging method is also described.