Adaptive Tuner-Rectifier Circuit for High-Q WPT Receivers
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Solution Overview
Problem
High quality factor (Q) magnetic resonance wireless power transfer (WPT) receivers are vulnerable to stability and sensitivity issues due to frequency drifts, component tolerance variations, and environmental effects, leading to degraded power transfer capabilities.
Innovation Solution
A compact circuit structure with an inductor coupled between switching networks that automatically tunes the resonant circuit, allowing adaptive energy rectification from alternating current to a charge buffer using synchronized time intervals, enabling high Q resonant WPT receivers with improved stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a high quality factor (Q) resonant circuit is used in the WPT receiver, then the maximum power delivery capability is improved, but the system becomes highly sensitive to frequency drifts, component tolerances, and environmental effects
Solution Approach 1:
The patent implements a dynamic tuning mechanism using a variable reactive element (inductor or capacitor) that can be adjusted in real-time to track and compensate for frequency drifts and parameter variations. This allows the high-Q resonant circuit to maintain optimal performance despite environmental changes and component tolerances, resolving the contradiction between high power capability and sensitivity to mismatch.
2Loss of energy
If a variable reactive element is added to the WPT receiver tank for tuning, then the losses at light loads are decreased, but the device complexity increases due to additional components
Solution Approach 1:
The patent designs the variable reactive element and associated control circuitry to serve multiple functions: it provides both power factor correction and adaptive tuning capabilities. By integrating these functions into a single control system, the patent reduces the overall device complexity while achieving energy loss reduction at light loads and maintaining optimal resonance conditions across varying power levels.
3Adaptability or versatility
If multiple variable capacitors and switches are used to alter resonance frequency, then the tuning capability is improved, but the device complexity and number of components increase
Solution Approach 1:
The patent combines multiple tuning functions into a single variable reactive element that can provide continuous or stepped adjustment of the resonance frequency. By merging the functionality of multiple capacitors and switches into one integrated component with electronic control, the patent achieves wide tuning capability while significantly reducing the number of discrete components and overall circuit complexity.
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 solution enhances the stability and efficiency of high Q resonant WPT receivers by dynamically adjusting the resonant circuit to match operating frequencies, thereby maintaining maximum power transfer and reducing sensitivity to mismatches.
Implementation Method 1
couple the inductor with the resonant circuit to charge the inductor from the resonant voltage
Implementation Method 2
resonating coils are created at the transmitter and receiver sides by compensating the coils using capacitive elements
Data Source
AI summary
A tuner and rectifier circuit for wireless power transfer receivers is provided using a single inductor and two switching networks. The single inductor is used for energy exchange between the receiver resonant circuit and an output energy buffer network wherein the rectification function is met. The tuning state of the receiver resonant circuit is tracked, and the inductor is accordingly coupled with the receiver resonant circuit after an adaptive time period to inject an inductive reactance to the tank for tuning purpose.