Wireless Power Transmitter Segmented Resonant Coil Efficiency
Solution Overview
Problem
Current wireless charging technologies face limitations in power transmission efficiency and safety, as they often generate undesirable magnetic fields and are restricted to charging a single device at a time, with inefficient power transfer and increased electromagnetic field exposure.
Innovation Solution
A wireless power transmitter that selectively operates resonant coils to match the resonance frequency of receivers, using a variable inductor and capacitor to enhance power transmission efficiency and minimize harmful magnetic field irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the area of the resonant coil is increased to charge multiple appliances wirelessly, then the charging capability is improved, but the power transmission efficiency decreases and harmful electromagnetic field leakage increases
Solution Approach 1:
The resonant coil is divided into multiple independently controllable coil units. Each coil unit can be selectively activated based on the position and number of receivers, allowing the system to charge multiple devices without activating the entire large-area coil, thus maintaining high transmission efficiency while providing versatile charging capability.
Solution Approach 2:
The system dynamically selects and activates only the necessary coil units based on real-time detection of receiver positions. This dynamic adaptation allows the system to optimize power transmission efficiency for each charging scenario while maintaining the capability to charge multiple devices simultaneously.
2Adaptability or versatility
If the area of the resonant coil is increased to charge multiple appliances wirelessly, then the charging capability is improved, but the harmful electromagnetic field leakage increases
Solution Approach 1:
By segmenting the resonant coil into multiple smaller coil units with independent control, the system can activate only the specific units needed for charging. This prevents unnecessary electromagnetic field generation in areas without receivers, reducing harmful field leakage while maintaining the ability to charge multiple devices.
Solution Approach 2:
Each coil unit can be independently controlled to generate electromagnetic fields only in the local regions where receivers are present. This localized field generation reduces overall electromagnetic field leakage to areas without devices while providing effective charging where needed.
3Device complexity
If a single resonant coil is used for wireless charging, then the system structure is simple, but the distance between power transmission and reception is very restricted
Solution Approach 1:
The resonant coil is segmented into multiple coil units that can be selectively activated. This segmentation allows the system to extend its effective charging distance by activating multiple distributed coil units, effectively covering a larger spatial range while maintaining relatively simple individual unit structures.
4Adaptability or versatility
If multiple resonant coils are operated simultaneously to charge multiple devices, then the charging versatility is improved, but the power transmission efficiency decreases
Solution Approach 1:
The system segments the resonant coil into multiple independently controllable units. When charging multiple devices, only the necessary coil units are activated based on receiver positions, avoiding the efficiency loss that would occur if all coils were operated simultaneously at full power. This maintains high transmission efficiency while providing charging versatility.
Solution Approach 2:
Instead of operating all coil units at full capacity, the system activates only the partial number of coil units needed for the current charging scenario. This partial action approach maintains high power transmission efficiency for each active unit while still providing the versatility to charge multiple devices when needed.
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 solution increases power transmission efficiency while reducing harmful magnetic field exposure, allowing for efficient charging of multiple devices and maintaining resonance frequency consistency.
Implementation Method 1
a wireless power transmission system based on resonance transmits electrical signals formed at transmitter and receiver sides through a coil in wireless
Implementation Method 2
the resonance frequency can be constantly maintained by inserting a variable inductor and a variable capacitor
Data Source
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AI summary
Disclosed are a wireless power transmitter and a method of transmitting power thereof. The wireless power transmitter to wirelessly transmit power to a wireless power receiver includes a transmission coil to receive power from a power supply apparatus, and a transmission resonance unit to transmit the power received therein from the transmission coil to the wireless power receiver using resonance. The transmission resonance unit includes an inner loop, and an outer loop connected to the inner loop while surrounding the inner loop.