Multi-Coil Wireless Charging with One Inverter and Alternating Frequencies
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Solution Overview
Problem
Existing wireless charging methods face inefficiencies in charging multiple receivers simultaneously, particularly due to increased electromagnetic radiation and the need for larger transmitting coils or multiple inverters, which complicates the system and increases costs.
Innovation Solution
A method using one transmitting inverter and multiple coils, where the number of transmission frequencies is set equal to the number of receivers, with each frequency applied alternately to reduce electromagnetic radiation and optimize power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single transmitting coil larger than multiple receiving devices is used to charge multiple receivers simultaneously, then wireless charging capability for multiple devices is achieved, but the transmitting coil size becomes excessively large
Solution Approach 1:
The transmitting coil is divided into multiple smaller transmitting coils (first transmitting coil, second transmitting coil, etc.) that can be independently controlled. Each transmitting coil can be selectively activated based on the position and charging needs of receiving devices, eliminating the need for one large coil while maintaining the ability to charge multiple devices simultaneously.
2Length of stationary object
If multiple transmitting coils are configured in a stack to improve transmission distance, then transmission distance increases, but transmission efficiency deteriorates
Solution Approach 1:
The system dynamically selects and activates only the transmitting coils that are needed based on real-time detection of receiving device positions and charging status. This dynamic control prevents energy waste from activating unnecessary coils while maintaining adequate transmission distance through selective coil activation.
Solution Approach 2:
The system changes operational parameters by adjusting which transmitting coils are active and at what power levels, optimizing the balance between transmission distance and efficiency based on the specific charging scenario rather than using a fixed stacked configuration.
3Adaptability or versatility
If multiple inverters are used to provide wireless charging to multiple receivers, then charging capability for multiple devices is achieved, but device complexity and cost increase
Solution Approach 1:
A single inverter is designed to control multiple transmitting coils, making it a multi-functional component that can serve multiple receiving devices through different coil combinations. This universal inverter approach reduces the total number of inverters needed while maintaining the capability to charge multiple receivers simultaneously.
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 approach reduces electromagnetic radiation and simplifies the transmitter design, enabling mass production of cost-effective wireless charging devices while maintaining efficient power transmission to multiple receivers.
Implementation Method 1
transmitting a wireless power transmission signal to the plurality of receiving coils using a plurality of transmitting coils connected to one inverter
Data Source
AI summary
The present disclosure relates to a method and apparatus for performing multiple wireless charging. A method or performing wireless charging according to an embodiment of the present disclosure may comprise: identifying one or more receiving coils subject to wireless charging; setting a plurality of transmission frequencies based on a plurality of receiving coils being identified; and transmitting a wireless power transmission signal to the plurality of receiving coils using a plurality of transmitting coils connected to one inverter. Herein, a wireless power transmission signal transmitted from each transmitting coil belonging to the plurality of transmitting coils may be generated by applying the plurality of transmission frequencies in a pre-configured order.