Adaptive Power Receiver Q-Mode Switching for Wireless Inductive Transfer
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Solution Overview
Problem
Conventional wireless power transfer systems face efficiency limitations due to operating conditions and mutual inductance, which can be affected by the distance between the primary and secondary units, leading to increased costs and reduced efficiency with the use of additional coils.
Innovation Solution
The implementation of an adaptive power receiver that can switch between high-Q and low-Q modes to control the power transfer cycle, allowing for efficient energy storage and release, thereby optimizing power delivery without the need for additional coils.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If additional coils are used to improve power transfer over larger distances, then power transfer capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies dynamics by making the Q-factor of the resonant circuit adjustable rather than fixed. The system dynamically switches between high-Q mode (for extended distance power transfer) and low-Q mode (for direct power delivery), allowing the same single-coil system to adapt to different operating conditions without requiring multiple fixed-configuration coils.
Solution Approach 2:
The single resonant coil in the remote device serves multiple functions: it can operate in high-Q mode to extend power transfer distance, in low-Q mode to deliver power directly to the load, and can be controlled to provide both power and communication signals. This multi-functionality replaces the need for separate coils for different purposes.
2Power
If distance between primary and secondary units is minimized, then mutual inductance increases, but operating parameter flexibility is reduced
Solution Approach 1:
The system uses dynamic Q-factor control to maintain adaptability across varying distances. When the remote device is close to the primary unit, it can operate in low-Q mode for efficient direct coupling. When moved farther away, it switches to high-Q mode to extend the effective coupling distance, providing operating parameter flexibility across a range of distances rather than being optimized for a single fixed distance.
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 enhances power transfer efficiency by dynamically controlling the power reception and transmission, reducing the number of components required for inductive coupling and minimizing equivalent series resistance, thus improving the overall performance of wireless power transfer systems.
Implementation Method 1
The adaptive power receiver is energized by a wireless power supply... receives power inductively from the primary coil
Implementation Method 2
a resonating coil that is coupled inductively to the directly-powered coil. The resonating coil receives power inductively from the primary coil, magnifies the oscillations, and generates an electromagnetic field
Data Source
AI summary
A remote device in accordance with the present invention includes an adaptive power receiver that receives wireless power from the wireless power supply by induction. The adaptive power receiver may be switched among two or more modes of operation, including, for example, a high-Q mode and a low-Q mode. By controlling the switching between modes, the amount of energy received by the adaptive receiver may be controlled. This control is a form of adaptive resonance control or Q control.