Resonant Wireless Power Receiver Impedance Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resonant wireless power receivers face damage due to excessive AC voltage exceeding the operating limits of semiconductor rectifiers and DC/DC converters, which are not effectively managed by existing technologies.
Innovation Solution
Incorporating a capacitor arrangement with a plurality of capacitors tuned to control AC voltage, coupled with an inductor element, to alter the open-circuit impedance of the receiver, thereby reducing AC voltage during defined situations by adjusting the impedance in series-parallel and parallel-series resonant circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the resonant wireless power receiver operates at high power levels, then power transfer efficiency is improved, but AC voltage exceeds the operating limits of semiconductor rectifiers and DC/DC converters causing damage
Solution Approach 1:
The patent implements dynamic impedance control by adjusting the resonant frequency of the receiver circuit in real-time. The controller modifies the resonant frequency dynamically to maintain AC voltage within safe operating limits while preserving power transfer efficiency, thereby resolving the contradiction between high power operation and component safety
Solution Approach 2:
The patent changes the resonant frequency parameter of the receiver circuit to control AC voltage levels. By adjusting this key parameter, the system can operate at high power levels without exceeding the voltage ratings of semiconductor components, thus achieving both improved power transfer efficiency and maintained component safety
2Reliability
If the AC voltage is reduced to protect semiconductor components, then component safety is improved, but power transfer efficiency deteriorates
Solution Approach 1:
The system dynamically adjusts the resonant frequency based on real-time voltage conditions. When voltage approaches unsafe levels, the resonant frequency is shifted to reduce voltage; when voltage is safe, the frequency is optimized for maximum power transfer. This dynamic adaptation resolves the contradiction by achieving both component safety and maintained power transfer efficiency
Solution Approach 2:
The controller monitors AC voltage levels and uses this feedback to adjust the resonant frequency accordingly. This closed-loop control ensures that voltage remains within safe limits while minimizing the impact on power transfer efficiency, thereby resolving the contradiction between component safety and power transfer performance
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 adaptive impedance control effectively reduces AC voltage at the rectifier input, protecting the semiconductor components and ensuring safe operation during excess power conditions, while maintaining suitable voltage levels for efficient power conversion.
Implementation Method 1
altering the open-circuit impedance of the RWP receiver to reduce the ac voltage under certain defined situations
Implementation Method 2
resonant wireless power receiver includes a matching network designed to resonate at the frequency of power transfer
Implementation Method 3
an inductor element that couples with a resonant wireless power source
Data Source
AI summary
A resonant wireless power (RWP) receiver is provided that includes an inductor element that couples with a resonant wireless power source. A capacitor arrangement is coupled to the inductor element altering the open-circuit impedance of the RWP receiver to reduce the ac voltage under certain defined situations. The capacitor arrangement includes a plurality capacitors tuned to a control ac voltage in the RWP receiver.