Multi-Coil Wireless Power Transmitter with Overlapping Rectangular Frames
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Solution Overview
Problem
Current wireless charging systems face limitations in achieving a wide charging area and efficient power transfer, particularly with low power charging methods, which result in long charging times and low efficiency due to increased device sizes and battery capacities.
Innovation Solution
A wireless power transmitter with a multi-coil assembly structure and a bidirectional communication protocol that adjusts power levels based on the charging environment, utilizing a coil assembly with overlapping coils in orthogonal directions and a power conversion unit to select and drive coils corresponding to the position of the receiver, ensuring efficient power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a single coil is used for wireless power transmission, then the device structure is simple, but the charging area is limited and charging efficiency is low
Solution Approach 1:
The wireless power transmission system divides the single coil into multiple coils arranged in an array. Each coil can be independently controlled and activated based on the receiver's position, thereby expanding the effective charging area while maintaining manageable structural complexity through modular design.
Solution Approach 2:
The patent transitions from a single-point coil to a multi-coil array configuration, adding spatial dimensionality to the power transmission system. This allows coverage of a larger area by distributing multiple coils across different positions and orientations in space.
2Productivity
If low power charging method is used, then energy consumption is reduced, but charging time increases and efficiency decreases
Solution Approach 1:
The system dynamically adjusts the power transmission level based on the receiver's position, coupling efficiency, and charging requirements. By selectively activating specific coils and adjusting their power output in real-time, the system optimizes both charging speed and energy efficiency, avoiding the trade-off between low power consumption and slow charging.
Solution Approach 2:
The wireless power transmission system incorporates feedback mechanisms that monitor the receiver's position, power reception status, and coupling efficiency. This feedback enables real-time adjustment of transmission power levels, allowing the system to operate at optimal efficiency while maintaining fast charging speeds when conditions permit.
3Area of moving object
If multiple coils are activated simultaneously, then charging area is expanded, but power loss and heat generation increase
Solution Approach 1:
Instead of uniformly activating all coils, the system applies local quality control by selectively activating only those coils that are most effective for the current receiver position. This localized approach expands the chargeable area as needed while minimizing power loss and heat generation in inactive or less effective coil regions.
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 solution enhances charging efficiency and performance by expanding the chargeable area while minimizing non-chargeable zones, allowing for secure and adaptable power transfer according to the charging situation, thereby reducing charging time and improving overall efficiency.
Implementation Method 1
In the electromagnetic induction method, a power transmission unit generates a magnetic field through a power transmission coil (i.e., a primary coil), and a power reception coil (i.e., a secondary coil) is placed at the location where an electric current may be induced so that power is transferred.
Implementation Method 2
In the resonant method, energy is transmitted using a resonant phenomenon between the transmission coil and the reception coil. In this case, a system is configured so that the primary coil and the secondary coil have the same resonant frequency, and resonant mode energy coupling between the transmission and reception coils is used.
Data Source
AI summary
According to one embodiment of the present invention, a wireless power transmitter for transferring power to a wireless power receiver, the wireless power transmitter includes a coil assembly including a plurality of coils, a power conversion unit configured to convert an input direct current (DC) into an alternating current (AC) for driving the coil assembly, and a communication/control unit configured to communicate with the wireless power receiver and control an amount of power to be transferred to the wireless power receiver using the coil assembly, wherein the plurality of coils are arranged in first and second directions, wherein each of the plurality of coils has a substantially rectangular frame structure having a through hole at a center, and is arranged so that at least portion of the each coil overlaps, in a plane, with a neighboring coil in the first and second directions.