Wireless Power Supply Using Resonant Coupling
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Solution Overview
Problem
Conventional wireless power supply systems using electromagnetic induction face challenges in achieving high power conversion efficiency due to limitations in magnetic coupling, power amplifier circuit losses, and restricted coil arrangements, leading to low efficiency and flexibility in power transmission.
Innovation Solution
A wireless power supply apparatus utilizing direct-current resonant coupling, where a power transmitter unit converts direct-current energy into electromagnetic energy and a power receiver unit converts it back into electric energy, with a resonator unit expanding the resonant field to enhance efficiency and flexibility in coil arrangement and placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electromagnetic induction coupling is used for wireless power supply, then power can be transmitted wirelessly, but power conversion efficiency is low due to limited magnetic coupling degree
Solution Approach 1:
The patent changes the fundamental operating principle from electromagnetic induction to electromagnetic resonance, operating at resonant frequencies to enhance the coupling effect between transmitter and receiver coils. This parameter change enables significantly improved power conversion efficiency while maintaining wireless power transmission capability
2Loss of energy
If power amplifier circuit is used to generate high frequency alternating current, then wireless power transmission can be achieved, but power loss is large reducing overall efficiency
Solution Approach 1:
The patent replaces the conventional power amplifier circuit with a resonance-based current generation system. By utilizing electromagnetic resonance between the transmitter coil and resonant circuit, the system generates high frequency alternating current without the substantial power losses inherent in traditional amplifier circuits, thereby reducing overall power loss
3Loss of energy
If magnetic flux path is optimized for higher density, then transmission efficiency improves, but coil arrangement positions are restricted
Solution Approach 1:
The patent transitions from optimizing magnetic flux density in a constrained spatial arrangement to utilizing electromagnetic resonance that can effectively couple over greater distances. This dimensional change in the approach allows coils to be positioned more flexibly in space while maintaining efficient power transmission through resonant coupling rather than relying solely on high magnetic flux density in fixed positions
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 configuration reduces energy loss and allows for higher power transmission efficiency and flexibility in device arrangement, enabling efficient wireless power transfer over a wider range with simpler system design.
Implementation Method 1
a power transmitter coil that extracts electric energy from the direct-current power source based on an operation of a power transmitter switching circuit and creates a resonance current; generates a magnetic flux that periodically changes at a resonant frequency in space and forms an electromagnetic resonant field
Implementation Method 2
a power receiver coil that creates a resonance current by obtaining electric energy from the resonant field
Data Source
AI summary
A power transmitter coil, a power transmitter circuit, and a direct-current power source constitute a power transmitter unit. Further, a power receiver coil, a power receiver circuit, and a load constitute a power receiver unit. Further, a resonator coil and a resonator circuit constitute a resonator unit. In the power transmitter unit, electric energy of the direct-current power source is directly converted into electromagnetic energy, a resonant field is expanded by making resonance currents of the same frequency to flow in the power transmitter coil and the resonator coil, and in the power receiver unit, electromagnetic energy of the resonant field is directly converted into electric energy, thereby transmitting electric power from the power transmitter unit to the power receiver unit.