Electrodynamic Wireless Power Receiver Using Mechanical Resonance
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Solution Overview
Problem
Existing wireless power transmission technologies face inefficiencies and safety concerns due to distance limitations and interference from conductive objects, particularly in near-field approaches like inductive coupling and magnetic resonance, which can cause unwanted eddy currents and heating.
Innovation Solution
The development of an electrodynamic wireless power transmission (EWPT) system that uses a mechanically resonating magnet within a receiver, tuned to oscillate at a frequency matching the magnetic field generated by a transmitter, converting the magnetic energy into electrical energy through electromechanical conversion, utilizing low-frequency magnetic fields and piezoelectric materials to enhance power transfer efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If inductive coupling is used for near-field wireless power transmission, then power transfer efficiency is maintained at close range, but efficiency decays quickly with distance
Solution Approach 1:
The patent employs a mechanically resonating magnet in the receiver that is tuned to oscillate at a frequency matching the magnetic field generated by the transmitter. This mechanical resonance enhances the coupling between transmitter and receiver, enabling efficient power transfer over distances up to tens of centimeters while maintaining high power density, thus resolving the contradiction between maintaining efficiency and extending transmission distance
Solution Approach 2:
The system transitions from conventional electromagnetic resonance to electrodynamic resonance by introducing mechanical oscillation of a magnet at frequencies typically used for audio or radio applications. This parameter change in the operating frequency and mechanism enables extended transmission distance while maintaining efficiency
2Length of stationary object
If magnetic resonance inductive wireless power transmission is used to increase distance, then transmission distance is extended, but system architecture becomes more complex due to precise tuning requirements
Solution Approach 1:
The patent replaces complex electromagnetic resonance tuning systems with a simpler electrodynamic system using a mechanically resonating magnet. The mechanical resonance frequency can be easily tuned by adjusting the physical dimensions of the magnet or suspension structure, significantly reducing system architecture complexity while achieving extended transmission distance
Solution Approach 2:
The system uses a dynamically resonating magnet that can be tuned to match the transmitter frequency. This dynamic adjustment capability allows the system to operate at optimal efficiency across varying distances without requiring complex static tuning mechanisms, thereby reducing overall system complexity
3Power
If high-frequency magnetic fields are used for wireless power transmission, then power transfer capability is enhanced, but eddy currents are generated in conductive objects causing heating and safety concerns
Solution Approach 1:
By using mechanical resonance of a magnet at lower frequencies (audio or radio range) rather than high-frequency electromagnetic fields, the system achieves effective power transfer without inducing harmful eddy currents in conductive objects. The mechanical oscillation frequency is decoupled from the electromagnetic field frequency, eliminating the heating problem while maintaining power transfer capability
Solution Approach 2:
The patent converts the potential harmful effect of high-frequency electromagnetic fields into a beneficial low-frequency mechanical resonance system. By using low-frequency magnetic fields to drive mechanical oscillation rather than directly using high-frequency electromagnetic fields for power transfer, the system eliminates eddy current heating while maintaining effective power transmission
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
The EWPT system achieves efficient power transfer over distances up to tens of centimeters with increased power density and reduced safety risks, suitable for IoT devices, wearables, and biomedical implants, while minimizing interference from metallic objects and avoiding heating issues.
Implementation Method 1
A receiver can be affected by the time-varying electromagnetic field, and a voltage and current can be induced in a receiver circuit
Implementation Method 2
The suspension structure is tuned to cause oscillation of the at least one magnet at a resonance frequency based on a frequency of the magnetic field
Implementation Method 3
utilizing low-frequency magnetic fields and piezoelectric materials to enhance power transfer efficiency and safety
Data Source
AI summary
The present disclosure relates to systems and methods for electrodynamic wireless power receivers. In some examples, a wireless power receiver electromechanically converts energy from a magnetic field. The wireless power receiver includes a planar suspension structure and at least one magnet. The planar suspension structure is tuned to cause oscillation of the at least one magnet at a resonance frequency based on a frequency of the time-varying magnetic field to generate electrical energy in the wireless power receiver.