Wireless Power Transmitter Using Multi-Frequency Magnetic Coupling
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Solution Overview
Problem
Current wireless power transmission technologies face inefficiencies due to radiation loss in the air and are limited by the need for compatibility with specific standards, preventing power transmission between devices using different wireless power transceiving standards.
Innovation Solution
A wireless power transmitter that uses multiple frequency bands to search for and communicate with receivers using different standards, employing a power transmitting module, communication modules, and a controller to detect and respond to signals across various frequency bands, allowing for the transmission of power to multiple receivers simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If electromagnetic radiation is used for wireless power transmission, then power can be transmitted wirelessly, but transmission efficiency is low due to radiation loss in the air
Solution Approach 1:
The patent replaces electromagnetic radiation (wave-based energy transmission) with electromagnetic induction (field-based energy transmission). This substitution uses magnetic coupling between transmitter and receiver coils to transfer energy directly through electromagnetic induction, eliminating the need for radiation through air and thereby reducing radiation loss while maintaining wireless transmission capability.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the power source and the receiver. By using magnetic coupling through intermediate magnetic fields generated by coils, energy is transmitted wirelessly without direct radiation loss, as the magnetic field acts as a mediator to transfer energy efficiently over short distances.
2Loss of energy
If inductive coupling scheme is used, then transmission efficiency is high, but power transmission distance is limited to few mm and location freedom is very low
Solution Approach 1:
The patent employs resonant magnetic coupling which dynamically adjusts the magnetic field resonance between transmitter and receiver coils. This dynamic resonance coupling allows the system to maintain efficient energy transfer over extended distances compared to static inductive coupling, enabling transmission from few cm to few m while preserving location freedom.
Solution Approach 2:
The patent changes the operating parameters by using resonant frequency matching between transmitter and receiver coils. By tuning the resonant frequency of both coils to match, the system achieves enhanced magnetic coupling efficiency over longer distances, overcoming the distance limitation of conventional inductive coupling while maintaining high transmission efficiency.
3Length of moving object
If resonance magnetic coupling scheme is used, then transmission range is enlarged to few cm to few m, but compatibility between different wireless power standards is poor
Solution Approach 1:
The patent implements a universal wireless power transmission system that can operate with multiple wireless power standards. The transmitter is designed to support both inductive coupling and resonant magnetic coupling schemes, enabling it to communicate with and transmit power to receivers using different standards (such as Qi and AirFuel), thereby achieving multi-functionality and broad standard compatibility.
Solution Approach 2:
The patent segments the wireless power transmission capability into multiple operational modes corresponding to different standards. The system can selectively activate appropriate communication modules and power transmission schemes based on the detected receiver type, allowing seamless adaptation to different standards while maintaining a unified transmitter architecture.
4Adaptability or versatility
If multiple wireless power standards are supported, then compatibility with different receivers is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple wireless power transmission capabilities into a single unified transmitter device. By integrating both inductive coupling and resonant magnetic coupling modules within one transmitter, the system achieves support for multiple standards without requiring separate devices, thereby managing complexity through consolidation rather than proliferation of components.
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
Enables efficient wireless power transmission to multiple receivers using different standards, enhancing mobility and convenience by overcoming compatibility issues and radiation loss limitations.
Implementation Method 1
The wireless power transmission technology, which can be classified as a technology utilizing electromagnetic radiation and electromagnetic induction
Implementation Method 2
The inductive coupling scheme is a method in which a magnetic field is radiated by a coil of a transmitter due to electromagnetic field coupling between the coil of the transmitter and a coil of a receiver
Implementation Method 3
The resonance magnetic coupling scheme is a method that has been proposed by Professor Marin Soljacic at MIT in 2005, the method in which energy is transferred using a phenomenon where a magnetic field is focused at both ends of a transmitter and a receiver due to a magnetic field applied with a resonant frequency
Data Source
AI summary
The present invention relates to a wireless power transmission apparatus and a method therefor. The present invention provides a wireless power transmission apparatus including: a power transmission module; a first communication module; a second communication module; and a controller for searching out a first wireless power reception device performing wireless power transmission/reception, transmitting a second magnetic field signal of a second frequency band through the power transmission module, sensing a second response signal to the second magnetic field signal through the second communication module, and searching out a second wireless power reception device performing wireless power transmission/reception by means of the second frequency band according to whether the second response signal is received.