Wireless Power Transfer Resonant Networks Reactive Load Control
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Solution Overview
Problem
Inductive Power Transfer (IPT) systems face challenges due to variations in magnetic coupling and tuning caused by misalignment, component tolerances, and degradation, leading to increased reactive load and losses in the system.
Innovation Solution
The solution involves selecting components for the primary and secondary resonant networks to minimize reactive loading and displacement power factor, using reactive tuning components that adapt to variations in inductance, capacitance, and coupling between the networks, and adjusting the natural resonant operating frequency to constrain reactive loading and power factor variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fixed frequency primary side current controlled system is used, then power transfer capability is maintained, but reactive load on power supply increases due to mistuned resonant network
Solution Approach 1:
The patent applies dynamics by making the resonant networks self-tuning through feedback control. The primary and secondary resonant networks continuously adjust their operating frequency based on real-time coupling conditions and component variations, transforming the static fixed-frequency system into a dynamic adaptive system that maintains optimal tuning without manual intervention
Solution Approach 2:
The patent implements feedback mechanisms where the resonant networks monitor their own tuning status and coupling conditions, then automatically adjust their operating parameters. This closed-loop control enables the system to detect mistuning conditions and correct them by adjusting frequency and component values, eliminating the need for external self-tuning circuitry
2Measurement precision
If self-tuning circuitry is adopted, then tuning accuracy is maintained over range of movement, but system complexity increases
Solution Approach 1:
The patent applies self-service by enabling the resonant networks to automatically tune themselves without external control circuitry. The primary and secondary networks independently adjust their own operating frequency and component values based on their detected coupling conditions, eliminating the need for complex external self-tuning mechanisms while maintaining high tuning accuracy
Solution Approach 2:
The patent utilizes parameter changes by dynamically varying the operating frequency and component values (such as capacitance and inductance) of the resonant networks. This allows the system to adapt to changing coupling conditions and component tolerances by continuously optimizing its electrical parameters, achieving accurate tuning across the full range of motion without additional hardware
3Device complexity
If fixed tuning components are used, then device simplicity is maintained, but reactive load increases due to component tolerances and degradation
Solution Approach 1:
The patent transforms the static fixed-tuning system into a dynamic adaptive system where the resonant networks continuously adjust their operating frequency and component values. This dynamic behavior compensates for component tolerances and degradation over time, maintaining optimal tuning and minimizing reactive load without requiring more complex fixed-tuning compensation circuitry
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 approach reduces the reactive load and power factor variations, minimizing energy losses and maintaining efficient power transfer across a range of relative movements and component changes, thereby enhancing the reliability and efficiency of IPT systems.
Implementation Method 1
a primary resonant network including: a primary winding capable of being energised to provide a magnetic field
Implementation Method 2
a pick-up winding capable of receiving energy from a varying magnetic field produced by a primary resonant network
Data Source
AI summary
A primary resonant network for a wireless power transfer has a primary winding capable of being energized to provide a magnetic field, and a reactive component selected to constrain the reactive loading on a power supply which energizes the primary resonant network. The reactive component is selected dependent on a given variation in inductance or capacitance of the primary resonant network and a given variation in inductance or capacitance of a secondary resonant network coupled to the primary resonant network.