Fractal Wireless Power Transmission Apparatus for Efficiency
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies due to low power conversion efficiency and electromagnetic compatibility issues, particularly in magnetic field resonance technologies, where high-frequency AC power supply and class A amplifiers result in significant power loss and electromagnetic noise interference.
Innovation Solution
A wireless power transmission apparatus utilizing fractal-shaped devices for power transmitting and receiving coils, which form electromagnetic field resonant coupling through a switching technique, reducing energy loss and enhancing electromagnetic compatibility by directly converting electric energy into electromagnetic field energy within a controlled resonance field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a class A amplifier is used to generate high-frequency AC power supply for magnetic field resonance, then power transmission can be achieved, but power loss increases significantly
Solution Approach 1:
The patent replaces the class A amplifier (electrical system with high loss) with a switching power supply system that uses pulse-width modulation and resonant circuits. This substitution reduces power loss by using switching elements that operate in saturation/cutoff regions rather than linear amplification, achieving the required AC power generation with significantly improved efficiency.
Solution Approach 2:
The patent changes the operating parameters by using a switching frequency that resonates with the LC circuit formed by the coil and capacitor. By operating at the resonant frequency where the inductive reactance equals the capacitive reactance, the system achieves efficient power transfer with minimal losses, transforming the approach from linear amplification to resonant switching.
2Power
If conventional power transmitting and receiving devices are used for electromagnetic field resonance, then wireless power transmission can be achieved, but electromagnetic noise radiates and causes electromagnetic compatibility issues
Solution Approach 1:
The patent converts the potentially harmful electromagnetic radiation into beneficial localized resonant coupling. By using resonant frequencies and tuned LC circuits, the electromagnetic energy that would otherwise radiate as noise is instead confined to create strong localized magnetic fields for efficient wireless power transfer, turning electromagnetic compatibility issues into the mechanism for power transmission.
Solution Approach 2:
The patent introduces resonant capacitors and tuned LC circuits as intermediaries between the power source and the load. These intermediary components filter and confine the electromagnetic fields, preventing harmful radiation while enabling efficient power transfer through controlled resonant coupling between transmitting and receiving coils.
3Loss of energy
If the degree of magnetic coupling between primary and secondary windings is increased to improve power conversion efficiency, then power transmission efficiency improves, but magnetic saturation occurs or physical constraints are violated
Solution Approach 1:
The patent uses periodic switching action at resonant frequency to transfer power in controlled pulses rather than continuous DC magnetization. This periodic excitation allows the magnetic coupling coefficient to remain moderate while achieving high efficiency through resonant energy transfer, avoiding the need for extremely tight coupling that would cause saturation.
Solution Approach 2:
The patent changes the operating mode from direct DC-to-DC conversion requiring high magnetic coupling to AC resonant conversion where power transfer efficiency depends on resonant frequency matching rather than coupling strength. This parameter change allows efficient power transfer with moderate coupling coefficients, avoiding magnetic saturation.
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 fractal-shaped device configuration increases power transmission efficiency, suppresses electromagnetic noise, and improves electromagnetic compatibility, allowing for effective wireless power transfer with reduced radiation and increased energy storage within a controlled resonance field.
Implementation Method 1
a power transmitting device that generates a resonant current and that directly generates, in a space, by using the resonant current, a periodically changing electromagnetic field
Implementation Method 2
a power receiving device that generates a resonant current by obtaining electric energy from the resonance field
Implementation Method 3
performing wireless power transmission by forming electromagnetic field resonant coupling
Data Source
AI summary
A power transmitter and a power receiver are arranged with a space therebetween. A power transmitting device generates a resonant current by taking out electric energy from a DC power supply through an operation of a power transmitting switch circuit, directly creating, in a space, by using the resonant current, an electromagnetic field that periodically changes at a switching frequency, and forms an electromagnetic resonance field in which the space itself has energy and vibrates. A power receiving device generates a resonant current by obtaining electric energy from the resonance field and forms a new electromagnetic field on the basis of this resonant current. The power transmitting device or the power receiving device, when viewed as a geometric figure, is a fractal-shaped device formed of a line conductor pattern in which a portion is similar to the whole, and increases electromagnetic field energy in a space surrounding the fractal-shaped device.