Dynamic Impedance Matching for Wireless Power Reception
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Solution Overview
Problem
Existing wireless power systems face inefficiencies in power reception due to varying input impedances and load conditions, leading to suboptimal performance and potential interference.
Innovation Solution
A system comprising antennas, dynamic impedance matches, RF-DC converters, and DC impedance converters that dynamically adjust impedances to optimize power reception and delivery, using control networks and feedback mechanisms to manage input and output impedances for efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If fixed impedance matching is used in wireless power reception, then device complexity is reduced, but power reception efficiency deteriorates under varying load conditions
Solution Approach 1:
The patent implements dynamic impedance matching by introducing a variable capacitor that can be adjusted in real-time based on load conditions and received power levels. This allows the impedance matching network to adapt to changing operating conditions, maximizing power transfer efficiency across different scenarios rather than being fixed for a single operating point.
Solution Approach 2:
The patent changes the electrical parameters of the impedance matching network by using a variable capacitor whose capacitance can be dynamically adjusted. This parameter change enables the system to optimize the matching between the rectenna and the load impedance under varying power reception conditions, thereby improving overall efficiency.
2Loss of energy
If dynamic impedance adjustment is implemented, then power reception efficiency is improved, but device complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the system monitors the received power level and load conditions, then automatically adjusts the variable capacitor setting to optimize impedance matching. This closed-loop control ensures efficient power transfer without requiring complex manual intervention or overly sophisticated control algorithms.
Solution Approach 2:
The impedance matching system is designed to self-adjust based on the operating conditions. The control network automatically modifies the capacitor setting in response to changes in received power or load impedance, enabling the system to maintain optimal efficiency without external intervention or complex centralized control.
3Adaptability or versatility
If arbitrary RF input fields are received, then adaptability is improved, but reflections increase due to impedance mismatch
Solution Approach 1:
The patent uses dynamic impedance adjustment to continuously adapt to arbitrary RF input fields from different directions and polarizations. By adjusting the variable capacitor based on the received signal characteristics, the system maintains good impedance matching across diverse input conditions, minimizing reflections that would otherwise occur with fixed impedance designs.
4Adaptability or versatility
If rectenna output power varies, then versatility is improved, but DC impedance matching becomes difficult
Solution Approach 1:
The patent introduces a DC impedance converter as an intermediary stage between the rectenna and the load. This converter acts as a buffer that can handle varying power levels from the rectenna while presenting a stable impedance to the load, thereby decoupling the impedance matching requirements from the power variation and simplifying the overall design.
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 system enhances power reception efficiency by adapting to arbitrary RF input fields and load conditions, reducing reflections and variance, and ensuring optimal power provision to DC loads, thereby improving overall system performance.
Implementation Method 1
receiving power wirelessly at an antenna
Implementation Method 2
dynamically adjusting an input impedance of a dynamic impedance match coupled to the antenna
Data Source
AI summary
A system for wireless power reception, preferably including one or more: antennas, dynamic impedance matches, RF-DC converters, DC impedance converters, and/or DC power outputs. A method for wireless power reception, preferably including: receiving power wirelessly at an antenna, dynamically adjusting an input impedance of a dynamic impedance match coupled to the antenna, and/or delivering the power to a load.