Wireless Power Transmission Impedance Matching for Multi-Load Charging
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Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies in charging multiple loads simultaneously due to varying impedance matching conditions and individual battery charging needs, leading to reduced power transfer efficiency and potential heat and electromagnetic interference issues.
Innovation Solution
A wireless power transmission system with adjustable impedance matching using transmission and reception coils and capacitors, along with control units to optimize power distribution to each battery, ensuring efficient charging of multiple secondary batteries without the need for multiple adapters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If magnetic coupled resonant wireless power transfer technology is used to transmit power to multiple loads simultaneously, then the ability to charge multiple devices is improved, but power transfer efficiency deteriorates due to changing impedance matching conditions
Solution Approach 1:
The patent implements dynamic impedance matching by adjusting the impedance of each reception coil circuit in real-time based on the charging state of connected devices. The control unit monitors the state of each load and dynamically adjusts the impedance of corresponding reception coils to maintain optimal power transfer efficiency when charging multiple devices with different power requirements simultaneously.
2Adaptability or versatility
If power is transmitted to multiple loads with different charging needs, then the ability to serve multiple devices is improved, but individual power supply optimization deteriorates
Solution Approach 1:
The patent applies local quality by providing each reception coil circuit with independent impedance control tailored to the specific charging needs of each connected device. The control unit individually adjusts the impedance of each reception coil based on the charging state of the corresponding device, ensuring optimal power supply for each load while serving multiple devices simultaneously.
3Device complexity
If fixed impedance matching is used in wireless power transmission, then circuit design simplicity is improved, but power distribution flexibility to multiple loads deteriorates
Solution Approach 1:
The patent transitions from fixed to dynamic impedance matching by incorporating adjustable impedance circuits for each reception coil. The control unit dynamically adjusts the impedance of each reception coil based on real-time monitoring of device states, enabling flexible power distribution to multiple loads with different charging requirements while maintaining relatively simple circuit architecture.
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 system enables simultaneous efficient charging of multiple batteries with improved power transfer efficiency, reduced heat generation, and minimized electromagnetic interference, while eliminating the need for multiple charging adapters, thus lowering costs and simplifying the charging process.
Implementation Method 1
magnetic coupled resonant wireless power transfer technology basically transmits power by using time-varying magnetic field coupling at a short distance
Implementation Method 2
a self-inductance of a transmission/reception self-resonant coil increases and a resistance decreases, so that a quality coefficient of a transmission/reception coil has at least several tens or more
Implementation Method 3
an optimum impedance matching condition is changed according to the position and the charging state of the load
Data Source
AI summary
The present invention relates to a battery charging system using wireless power transmission, including a charging power supply device that comprises: a power supply unit that supplies power for wireless power transmission; a power transmission unit that comprises at least one power transmission coil and wirelessly transmits power for charging a battery; and a transmission impedance matching unit that matches the impedance between the power supply unit and the power transmission unit; and a battery charging device that receives power wirelessly transmitted from the charging power supply device through power reception coils individually corresponding to one or more batteries and charges the batteries. According to the present invention, a plurality of unit batteries can be simultaneously charged by one charging power supply device, that is, one transmission module. With this advantage, a plurality of battery cells can be simultaneously charged wirelessly without wires, and quick charging is also possible.