Wireless Power Feeding Impedance Matching Circuit
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Solution Overview
Problem
Resonant wireless power feeding systems face challenges in maintaining high power transmission efficiency due to variations in distance between the power feeding and reception devices, requiring dynamic control of oscillation frequency, which increases device size and cost.
Innovation Solution
Incorporating transmission-reception circuits and matching circuits in both devices, with wireless signal adjustments to optimize impedance matching without frequency control, ensuring efficient power transfer regardless of distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If dynamic control of oscillation frequency is implemented to maintain high power transmission efficiency, then power transmission efficiency is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the impedance parameter of the resonant coil instead of changing the oscillation frequency. By adjusting the impedance through connected impedance elements (capacitors or inductors), the system maintains high power transmission efficiency without requiring dynamic frequency control, thus reducing device complexity
Solution Approach 2:
The patent uses a simplified impedance adjustment mechanism that copies the essential function of frequency control (maintaining resonance condition) but implements it through a simpler structure - connecting impedance elements in series or parallel with the resonant coil rather than using complex frequency synthesis circuits
2Loss of energy
If dynamic control of oscillation frequency is implemented to maintain high power transmission efficiency, then power transmission efficiency is improved, but device cost increases
Solution Approach 1:
The patent changes the impedance parameter of the resonant coil instead of changing the oscillation frequency. By adjusting the impedance through connected impedance elements (capacitors or inductors), the system maintains high power transmission efficiency without requiring dynamic frequency control, thus reducing device complexity
Solution Approach 2:
The patent uses simple, inexpensive impedance elements (standard capacitors or inductors) that can be easily manufactured and replaced, replacing the need for expensive frequency control circuits and synthesizers
3Loss of energy
If impedance matching is adjusted to maintain high power transmission efficiency, then power transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent changes the impedance parameter of the resonant coil instead of changing the oscillation frequency. By adjusting the impedance through connected impedance elements (capacitors or inductors), the system maintains high power transmission efficiency without requiring dynamic frequency control, thus reducing device complexity
Solution Approach 2:
The patent implements dynamic impedance adjustment by connecting impedance elements in series or parallel with the resonant coil, allowing the system to adapt to changing transmission conditions while maintaining a relatively simple overall structure
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 enables high power transmission efficiency between the power feeding and reception devices without dynamically adjusting the oscillation frequency, reducing device complexity and cost while maintaining efficient power transfer across varying distances.
Implementation Method 1
a first resonant coil resonating with a second resonant coil electromagnetically coupled to a second coil in a power reception device
Implementation Method 2
a first resonant coil resonating with a second resonant coil electromagnetically coupled to a second coil in a power reception device
Data Source
AI summary
A resonant power feeding system that can provide high power transmission efficiency between a power feeding device and a power reception device without dynamically controlling the oscillation frequency in accordance with the distance between the power feeding device and the power reception device. High power transmission efficiency between the power feeding device and the power reception device is obtained by addition of a structure for adjusting the matching condition to both the power reception device and the power feeding device. Specifically, a transmission-reception circuit and a matching circuit are provided in both the power reception device and the power feeding device, and wireless signals for adjusting the matching circuit are transmitted and received through a resonant coil. Thus, the power feeding device can efficiently supply power to the power reception device without adjusting the oscillation frequency.