Underwater Wireless Power Supply Antenna Resonance
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Solution Overview
Problem
Existing wireless power supply technologies face challenges in efficiently transmitting power underwater due to high conductivity of seawater, leading to significant losses and requiring precise positioning of antennas, which is difficult to achieve with larger distances and potential creature adhesion issues.
Innovation Solution
The wireless power supply device uses resonating antenna units with multiple laminated coils and dielectrics to determine the power transmission frequency, allowing for efficient energy transfer over longer distances by reducing antenna size and minimizing losses in conductive media like seawater.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the distance between power transmission antenna and power receiving antenna is increased to 5 cm or longer, then positioning accuracy requirements and creature adhesion restrictions are greatly eased, but power transmission efficiency deteriorates due to high conductivity of seawater causing eddy current and diffusion current losses
Solution Approach 1:
The patent changes the operating frequency parameter to below 200 KHz to reduce attenuation of electromagnetic fields in seawater. By operating at lower frequencies, the system achieves acceptable power transmission efficiency even at distances of 5 cm or longer, resolving the contradiction between distance and efficiency
Solution Approach 2:
The patent employs resonant oscillation between transmission and receiving antennas at matched frequencies. This dynamic resonance approach creates a coupled oscillating magnetic field that enhances energy transfer efficiency at longer distances compared to static magnetic coupling methods
2Reliability
If the distance between antennas is increased to reduce creature adhesion issues, then reliability of power supply is improved, but power transmission efficiency deteriorates due to electromagnetic field loss in conductive medium
Solution Approach 1:
The patent optimizes the frequency parameter to below 200 KHz where attenuation in seawater is reduced. This parameter change allows the system to maintain acceptable transmission efficiency at larger distances, thereby improving reliability by reducing creature adhesion issues while minimizing energy loss
Solution Approach 2:
The patent converts the harmful eddy current losses in seawater into a beneficial resonant coupling mechanism. By operating at resonant frequencies below 200 KHz, the system utilizes the conductive properties of seawater in a controlled manner to achieve efficient power transfer at longer distances
3Loss of energy
If resonant frequency is reduced to below 200 KHz to reduce attenuation in seawater, then power transmission efficiency is improved at longer distances, but antenna size increases making it unsuitable for mobile bodies or sensors
Solution Approach 1:
The patent employs a multi-layered coil structure where coils are nested within each other. This nesting approach increases the effective inductance and resonant frequency of compact antennas, allowing smaller antennas to operate at the required low frequencies for reduced seawater attenuation
Solution Approach 2:
The patent uses composite structures combining multiple coil windings with different geometries and orientations. This composite antenna design achieves the required inductance values for low-frequency operation in a compact volume, resolving the contradiction between frequency and size
4Loss of energy
If impedance matching is performed between transmission antenna and variable capacitance/inductor in high conductivity medium, then power transmission efficiency is improved, but device complexity increases due to additional impedance adjustment components
Solution Approach 1:
The patent merges the impedance matching function into the antenna structure itself through carefully designed coil geometries and winding configurations. The antenna design inherently provides the necessary impedance transformation, eliminating the need for separate variable capacitance and inductor components while maintaining high transmission efficiency
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 efficient power transmission with a size reduction of the antennas suitable for mobile bodies or sensors, achieving transmission efficiencies of 70% or higher at frequencies below 200 KHz, even at distances of 5 cm or longer, while maintaining a low-cost and waterproof structure.
Implementation Method 1
When alternating power is applied to the coil of the power transmission antenna, a magnetic field passing through the coil is generated. When the magnetic field passes through the coil of the power receiving antenna, an induced current is generated in the coil of the power receiving antenna
Implementation Method 2
The power transmission antenna and the power receiving antenna resonate at a frequency determined by an impedance of the power transmission antenna, an impedance of the power receiving antenna and an impedance of the medium
Data Source
AI summary
In order to reduce a power transmission antenna and power receiving antenna of a wireless power supply device for supplying power underwater to a size suitable for an underwater mobile body and sensor, this underwater wireless power supply device 101 wirelessly transmits energy by resonating at a frequency determined by the impedance of a power transmission antenna 103 that transmits energy wirelessly in a good conductor medium 102, the impedance of a power receiving antenna 104 which receives energy transmitted from the power transmission antenna 103, and the impedance of the good conductor medium 102. The power transmission antenna 103 and the power receiving antenna 104 have the multiple antenna coils 105, 106, and at least one dielectric 107, 108 arranged between the multiple antenna coils 105, 106, and the multiple antenna coils 105, 106 each has multiple laminated coils 109.