Tunable Wireless Power Receiver With Feedback Mode Switching
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies and safety concerns due to distance-dependent decay in power transfer efficiency and the generation of unwanted eddy currents in conductive objects, which can cause heating and inefficiencies.
Innovation Solution
A tunable wireless power transfer receiver system that includes a receiver, a sensing device, and a tuning device. The receiver converts energy from a time-varying magnetic field, and the sensing device detects operational parameters such as the angle of the magnet, current, voltage, or power. The tuning device initiates a tuning action through a control mechanism, which can modify the electrical load, stiffness of the receiver suspension, magnetic field, or transmitter settings to adjust the receiver's mode from resonant to continuously rotating or vice versa.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If inductive coupling is used for near-field wireless power transmission, then power transfer is efficient at close range, but efficiency decays quickly with distance
Solution Approach 1:
The receiver system dynamically adjusts its operating parameters including resonance frequency and mechanical mode (oscillating vs. continuously rotating) based on real-time feedback from sensors monitoring operational parameters. This dynamic adaptation allows the system to maintain efficient power transfer across varying distances by optimizing the receiver's response to the transmitted magnetic field.
Solution Approach 2:
The system changes physical parameters such as the receiver's resonance frequency, mechanical stiffness, and operational mode to match the transmitted field characteristics. By adjusting these parameters in real-time, the system maintains optimal coupling efficiency whether operating at close or greater distances from the transmitter.
2Length of stationary object
If magnetic resonance inductive wireless power transmission is used to increase distance, then power transfer efficiency is maintained, but system architecture becomes more complex
Solution Approach 1:
The receiver system performs self-tuning by automatically adjusting its resonance frequency and operational parameters based on feedback from its own sensors. This self-service capability eliminates the need for complex external tuning mechanisms and precise pre-coordination between transmitter and receiver, simplifying the overall system architecture while maintaining resonant coupling at extended distances.
Solution Approach 2:
Sensors on the receiver monitor operational parameters and provide feedback to a control mechanism that automatically adjusts the receiver's tuning. This closed-loop feedback system enables the receiver to autonomously optimize its performance, reducing the complexity of system architecture compared to open-loop resonant systems that require precise pre-tuning.
3Power
If strong magnetic fields are used for wireless power transmission, then power transfer capability is increased, but eddy currents are generated in conductive objects causing heating and inefficiencies
Solution Approach 1:
The receiver dynamically adjusts its operational mode between oscillating and continuously rotating based on real-time conditions. This dynamic adaptation allows the system to optimize power extraction while minimizing the duration and intensity of magnetic field exposure to intermediate objects, thereby reducing eddy current generation and associated heating effects.
Solution Approach 2:
The system employs periodic oscillating mode where the receiver magnet oscillates back and forth rather than rotating continuously. This periodic action reduces the average power extraction rate compared to continuous rotation, which in turn reduces the intensity of magnetic fields affecting intermediate conductive objects, thereby minimizing eddy current heating while still achieving effective power transfer.
4Loss of energy
If the receiver operates in resonant mode, then power transfer efficiency is optimized, but the magnet may over-rotate and cause mechanical non-linearities
Solution Approach 1:
Sensors continuously monitor the magnet's angular position and operational parameters, providing feedback to a control mechanism. When the magnet approaches extreme angular positions that could cause over-rotation or mechanical non-linearities, the feedback system triggers a mode change from oscillating to continuously rotating, thereby preventing mechanical damage while maintaining power transfer efficiency.
Solution Approach 2:
The system dynamically switches between oscillating and continuously rotating modes based on real-time sensor feedback. This dynamic mode switching allows the receiver to operate in high-efficiency resonant oscillating mode under normal conditions, while automatically transitioning to continuously rotating mode when approaching mechanical limits, thus maintaining both efficiency and reliability.
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 tunable receiver system enhances efficiency and prevents damage by dynamically adjusting its operation based on detected parameters, maintaining optimal power transfer while preventing over-rotation and ensuring safe operation.
Implementation Method 1
A transmitter can create a time-varying electromagnetic field. 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 receiver converts energy from a time-varying magnetic field using electromechanical conversion. The receiver can include a magnet that rotates or oscillates based on the time-varying magnetic field to generate electrical energy in the receiver.
Implementation Method 3
The sensing device can detect one or more operational parameter of the receiver. In some embodiments, operational parameters of the receiver can include angle of the magnet, current, voltage or power.
Data Source
AI summary
The present disclosure relates to systems and methods for tunable electrodynamic wireless power receivers. In some examples, a wireless power receiver electromechanically converts energy from a magnetic field using an oscillating or rotating magnet. A sensing device detects an operational parameter of the receiver, and a tuning device initiates a tuning action based on the operational parameter.