Reconfigurable DC Output Filter Circuit for Wireless Power Transfer
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Solution Overview
Problem
Existing DC output filter circuits in wireless power transfer systems face inefficiencies due to mismatched impedance between the load and the filter circuit, leading to suboptimal current waveform shaping and reduced operational efficiency.
Innovation Solution
A reconfigurable DC output filter circuit that dynamically adjusts its configuration based on operating efficiency curves, switching between capacitive and capacitive-inductive filter configurations to match changing load impedance, thereby reshaping the current waveform and optimizing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a fixed DC output filter circuit configuration is used, then the circuit structure is simple, but the operational efficiency decreases due to impedance mismatch with varying loads
Solution Approach 1:
The patent applies dynamics by making the DC output filter circuit reconfigurable, allowing it to dynamically switch between different configurations (e.g., capacitor-only, inductor-capacitor combinations) based on load conditions. This dynamic adaptation enables the filter to maintain optimal impedance matching with varying loads, thereby improving operational efficiency while managing circuit complexity through controlled reconfiguration
Solution Approach 2:
The patent implements parameter changes by varying the filter circuit configuration parameters (inductance values, capacitance values, and their series/parallel arrangements) according to load requirements. By changing these parameters dynamically, the system optimizes the filter's impedance characteristics to match different load conditions, resolving the contradiction between fixed simplicity and variable efficiency
2Loss of energy
If the filter circuit is reconfigured to match varying load impedance, then operational efficiency improves, but the current waveform shaping becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the filter circuit into modular components (multiple capacitors and inductors) that can be independently switched and reconfigured. This segmentation allows the system to create different filter configurations (C-filter, LC-filter, etc.) by connecting specific segments, thereby achieving efficient current waveform shaping across varying loads without requiring a completely complex redesign for each condition
3Adaptability or versatility
If a reconfigurable filter circuit is implemented, then adaptability to varying loads improves, but the control system complexity increases
Solution Approach 1:
The patent implements feedback by using a controller that monitors load conditions and automatically adjusts the filter circuit configuration accordingly. The controller receives feedback about the current load state and switches between pre-defined filter configurations (capacitor-only, inductor-capacitor series, inductor-capacitor parallel) to maintain optimal performance, thereby achieving high adaptability while managing control complexity through systematic feedback-based switching
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 reconfigurable filter circuit enhances operational efficiency by adapting to varying load conditions, improving power delivery and reducing losses in wireless power transfer systems, particularly in AC to DC converter circuits and wireless charging applications.
Implementation Method 1
changing a configuration of a DC output filter circuit to reshape a current waveform in a rectifier circuit
Data Source
Figure 1~2
Figure 3
Figure 4A~4B
AI summary
A method of operating an AC to DC converter circuit can be provided by changing a configuration of a DC output filter circuit to reshape a current waveform in a rectifier circuit, included in the AC to DC converter circuit, based on an operating efficiency of the AC to DC converter circuit. Related circuits and articles of manufacture are also disclosed.