Wireless Power Resonator with Adjustable Magnetic Core
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless power transmission systems face efficiency deterioration due to resonance frequency deviations caused by variations in resonator shape, environment, and long-term deterioration, especially when the distance between power transmitting and receiving coils is short, leading to changes in inductance and coupling coefficients.
Innovation Solution
A power transmitting device with a resonator including a magnetic core and a coil, where the coil and magnetic core are adjusted relative to each other in the longitudinal direction to optimize resonance frequency matching, using a controller to monitor current values and adjust positions to maximize transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between power transmitting coil and power receiving coil is shortened to improve power transfer efficiency, then transmission efficiency is improved, but inductance value increases and resonance frequency deviates from desired value
Solution Approach 1:
The patent applies the dynamics principle by making the magnetic core position adjustable relative to the coil. The magnetic core can be dynamically repositioned along the coil's longitudinal direction to optimize resonance frequency matching under different operating conditions. This dynamic adjustment capability allows the system to maintain stable resonance frequency even when coil distance changes, thereby resolving the contradiction between improving power transfer efficiency and maintaining resonance frequency stability.
Solution Approach 2:
The patent employs parameter changes by adjusting the magnetic core position to change the self-inductance parameter of the resonator. By varying the magnetic core's position relative to the coil, the system can tune the resonance frequency to match the desired value. This parameter adjustment mechanism enables the system to compensate for inductance changes caused by shortened coil distance, thus maintaining both high efficiency and frequency stability.
2Productivity
If resonator shape or ambient environment changes cause resonance frequency deviation, then transmission efficiency deteriorates, but adjusting magnetic core position requires additional device complexity
Solution Approach 1:
The patent implements a simple dynamic adjustment mechanism where the magnetic core can be repositioned relative to the coil. This dynamic capability allows the system to adapt to resonance frequency deviations caused by environmental changes or shape variations. The adjustment mechanism is designed to be relatively simple, involving only the movable positioning of the magnetic core within the existing resonator structure, thus minimizing added complexity while maintaining high transmission efficiency.
3Productivity
If magnetic core influence on counterpart side increases coupling coefficient, then transmission efficiency improves, but inductance value varies with positional relation causing resonance frequency deviation
Solution Approach 1:
The patent resolves this contradiction by introducing dynamic adjustability of the magnetic core position. When the distance between transmitting and receiving coils is short, the magnetic core's influence on the counterpart side increases coupling coefficient, which is beneficial for efficiency. However, this also causes inductance variation. The dynamic positioning capability allows the system to adjust the magnetic core location to optimize both coupling and resonance frequency, maintaining inductance stability while preserving the beneficial coupling effect.
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 solution effectively stabilizes resonance frequencies, enhancing transmission efficiency by allowing for precise adjustment of self-inductance and coupling coefficients, thereby maintaining high power transfer efficiency despite positional changes and environmental variations.
Implementation Method 1
A wireless power transmitting system for wirelessly transmitting power between coils based on a coupling coefficient or a mutual inductance of the coils
Implementation Method 2
a resonator structure in which a coil is wound around a magnetic core is proposed
Implementation Method 3
transmission efficiency becomes maximum when the resonance frequencies of both transmitting and receiving resonators are equal
Data Source
AI summary
According to one embodiment, there is provided a power transmitting device including: a power supply, a resonator, an adjuster and a controller. The power supply supplies AC power. The resonator includes a magnetic core and a coil wound around the magnetic core, the resonator wirelessly transmitting the AC power supplied from the power supply to a different resonator arranged to be opposed to the resonator. The adjuster relatively moves the coil and the magnetic core along a longitudinal direction of the coil. The controller controls the adjuster based on a value of current flowing in the resonator to adjust relative positions of the magnetic core and the coil.