Non-Resonant Inductive Power Transfer Frequency Control
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Solution Overview
Problem
Inductive power transfer systems face challenges in maintaining resonance due to environmental fluctuations and coil alignment variations, requiring sensitive tuning mechanisms and high transmission voltages, which are not tolerant to fluctuations and alignment changes.
Innovation Solution
An inductive power transfer system that operates at a transmission frequency significantly different from the resonant frequency, using a driver to adjust the frequency based on feedback signals and incorporating a peak detector to monitor voltage changes, allowing for more stable power transfer with lower voltages and increased tolerance to environmental changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If inductive power transfer systems operate at resonant frequency, then power transfer efficiency is improved, but the system becomes highly sensitive to environmental fluctuations and coil alignment variations
Solution Approach 1:
The patent changes the operating parameter from resonant frequency to non-resonant frequency. By operating at a frequency significantly different from the resonant frequency, the system achieves lower sensitivity to environmental fluctuations and coil alignment variations while still maintaining acceptable power transfer efficiency. This parameter change fundamentally alters the system's response characteristics to external disturbances.
2Stability of the object's composition
If tuning mechanisms are added to maintain resonance, then power transfer stability is improved, but device complexity increases
Solution Approach 1:
The patent extracts and removes the complex tuning mechanisms from the system. By operating at a non-resonant frequency, the system eliminates the need for resonance-seeking ballast circuits, frequency tuning circuits, and other complex tuning mechanisms that would otherwise be required to maintain stable power transfer at resonant frequency.
3Power
If high transmission voltages are used for resonant transmission, then power transfer capability is improved, but heat loss and voltage requirements increase
Solution Approach 1:
The patent changes the voltage parameter by operating at non-resonant frequency. This operating mode inherently requires lower transmission voltages to achieve the same power transfer capability, thereby reducing resistive losses and heat generation in the circuit components.
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 achieves higher tolerance to environmental fluctuations and coil alignment variations, reduces heat loss, and enables efficient power regulation by adjusting transmission frequency, making it suitable for various applications including high-power devices and implanted devices.
Implementation Method 1
An oscillating electric potential is applied across a primary inductor. This sets up an oscillating magnetic field in the vicinity of the primary inductor. The oscillating magnetic field may induce a secondary oscillating electrical potential in a secondary inductor placed close to the primary inductor.
Implementation Method 2
The oscillating magnetic field may induce a secondary oscillating electrical potential in a secondary inductor placed close to the primary inductor. In this way, electrical energy may be transmitted from the primary inductor to the secondary inductor by electromagnetic induction without a conductive connection between the inductors.
Data Source
AI summary
Non-resonant inductive power transmission wherein the driving voltage across a primary inductor oscillates at a frequency significantly different from the resonant frequency of the inductive coupling system. Embodiments of the invention include systems and methods for: power regulation using frequency control, fault detection using voltage peak detectors and inductive communication channels.