Wireless Power Transmission Resonance Matching
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies due to significant power loss and limited transmission distance, with current methods using electromagnetic induction, magnetic field resonance, or electric field resonance, which also result in increased weight and conductor losses.
Innovation Solution
A wireless power transmission system employing electrodes with a predetermined spacing and inductors, configured for near-field operation with matching resonance frequencies, to efficiently transmit alternating current power over a greater distance while minimizing weight and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electromagnetic induction is used for wireless power transmission, then power can be transmitted between non-contact circuits, but electric power loss in the transmission coil is large and transmission distance is limited to millimeter or centimeter order
Solution Approach 1:
The patent changes the operating parameters by using resonant frequency matching between transmission and reception coils. This resonance condition allows for significantly reduced power loss and extended transmission distance compared to conventional electromagnetic induction methods. The specific parameter change involves operating at frequencies where the coils are in resonance, thereby improving coupling efficiency.
2Length of stationary object
If magnetic field resonance is used to extend transmission distance, then a coil structure is required which increases mass and causes conductor loss due to current flow
Solution Approach 1:
The patent uses resonant frequency operation to achieve extended transmission distance without requiring heavy coil structures. By operating at resonant frequencies, the system can achieve strong coupling with minimal current, thereby reducing both the mass of the apparatus and the conductor losses associated with current flow through coils.
3Device complexity
If electric field resonance is used instead of magnetic field, then a coil is not needed for resonance, but conductor lines of quarter-wavelength are required which cause alternating current resistance and conductor loss
Solution Approach 1:
The patent avoids the use of long quarter-wavelength conductor lines by operating at resonant frequencies with appropriately sized coils. This parameter change in the resonant condition allows for shorter conductor lengths, thereby reducing alternating current resistance and conductor losses while maintaining the benefits of electric field resonance.
4Area of moving object
If the gap between electrically conductive lines is narrowed to reduce electrode size, then alternating current resistance due to coupling between wires increases
Solution Approach 1:
The patent uses resonant frequency operation to achieve strong power transmission coupling without requiring narrow gaps between conductive lines. By operating at resonance, the system can maintain adequate spacing between lines while still achieving efficient power transfer, thereby avoiding the increase in alternating current resistance that would result from narrowing the gap.
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 efficient power transmission over extended distances with reduced weight and space, maximizing transmission efficiency by optimizing electrode spacing and resonance frequencies, thereby overcoming the limitations of previous technologies.
Implementation Method 1
a resonance frequency of a coupler including the first and second electrodes and the first inductor and a resonance frequency of a coupler including the third and fourth electrodes and the second inductor are configured to be substantially equal
Implementation Method 2
a wireless electric power transmission apparatus that uses electromagnetic induction to transmit electric power between two non-contact electric circuits
Data Source
Figure 1
Figure 2A~2E
Figure 3A~3F
AI summary
To provide a wireless power transmission system that is capable of efficiently transmitting power. The power transmitting device includes first and second electrodes (11, 12); first and second connection (15, 16) lines that electrically connect the first and second electrodes and an alternating current power generating section; and a first inductor (13, 14) that is interposed between the first and second electrodes and at least one of the two output terminals of the alternating current power generating section. The power receiving device includes third and fourth electrodes (21, 22) having a total width of a dimension of less than or equal to λ/2π, which is a near field; third and fourth connection lines (25, 26) that electrically connect the third and fourth electrodes and a load; and a second inductor (23, 24) that is interposed between the third and fourth electrodes and at least one of the two input terminals of the load. A resonance frequency of a coupler including the first and second electrodes and the first inductor and a resonance frequency of a coupler including the third and fourth electrodes and the second inductor is configured to be substantially equal.