Wireless Power Transmission Using Segmented Resonance Frequencies
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Solution Overview
Problem
Wireless power transmission systems face issues with induction-heating of metal foreign materials when detached and the risk of water leakage and electric shock in humid environments, particularly in refrigerator applications.
Innovation Solution
A wireless power transmission system using multiple coils with a transmitter and receiver, where the receiver generates a secondary resonance frequency higher than the primary resonance frequency, minimizing heating and maintaining unnecessary circuits within a minimum range, and employing a PCB coil structure with MnZn-based ferrite for increased mutual inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless power transmission system uses a single primary resonance frequency, then power transmission is achieved, but metal foreign materials are induction-heated when approaching the system after detachment
Solution Approach 1:
The patent segments the resonance frequency into multiple distinct frequencies (first resonance frequency and second resonance frequency). The transmitter operates at the first resonance frequency during normal power transmission, while the receiver is designed to generate the second resonance frequency only when properly coupled. This frequency segmentation prevents metal foreign materials from being induction-heated because they cannot resonate at either frequency effectively, resolving the contradiction between achieving power transmission and preventing harmful induction heating.
Solution Approach 2:
The patent changes the resonance frequency parameter from a single frequency to multiple frequencies. By designing the receiver to generate a second resonance frequency higher than the first resonance frequency, the system creates a frequency gap that prevents metal foreign materials from being heated. This parameter change resolves the contradiction by maintaining power transmission effectiveness while eliminating the harmful induction heating effect.
2Ease of operation
If the wireless power transmission system is provided on a refrigerator rack, then convenient power supply to loads is achieved, but risks of water leakage and electric shock occur in humid environments
Solution Approach 1:
The patent replaces the mechanical contact-based power transmission system with a wireless electromagnetic field-based system. Instead of using physical contacts that can corrode or leak in humid refrigerator environments, the system uses magnetic coupling between the transmitter and receiver coils to transmit power. This substitution eliminates the risks of water leakage and electric shock associated with traditional contact-based systems while maintaining ease of operation for powering loads like LEDs on refrigerator racks.
3Object-affected harmful factors
If multiple coils are used with different resonance frequencies, then induction heating of metal foreign materials is prevented, but device complexity increases
Solution Approach 1:
The patent merges the functions of multiple coils into a single integrated receiver structure. The receiver includes both the primary coil for receiving power at the first resonance frequency and the secondary coil for generating the second resonance frequency, combining these functions into one compact component. This merging approach prevents induction heating of metal foreign materials while minimizing the increase in device complexity, as the multiple coils are integrated rather than implemented as separate external 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
Prevents induction heating of metal foreign materials and addresses the risks of water leakage and electric shock in humid environments, ensuring efficient power transmission to loads like LEDs on refrigerator racks.
Implementation Method 1
a primary coil for generating a primary resonance frequency in accordance with the received voltage
Implementation Method 2
a secondary coil for generating a secondary resonance frequency greater than the primary resonance frequency
Implementation Method 3
capacitors connected in series or in parallel in accordance with an equivalent resistance of the load
Data Source
AI summary
A wireless power transmission system using multiple coils comprises a transmitter; and a receiver, wherein the transmitter includes a module for receiving a predetermined voltage, and a primary coil for generating a primary resonance frequency in accordance with the received voltage. The receiver spaced apart from the transmitter includes a load for emitting light, capacitors connected in series or in parallel in accordance with an equivalent resistance of the load, and a secondary coil for generating a secondary resonance frequency greater than the primary resonance frequency.