Selective Transmitting Coil Control for Efficient Wireless Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power transfer systems face inefficiencies due to the need for large coils or multiple coils to accommodate varying receiver positions, leading to uneven magnetic field distribution, increased power loss, and complexity in current adjustment, which raises costs and complexity.
Innovation Solution
A wireless power transfer system that selectively drives transmitting coils based on verified coupling coefficients between coils, using a controller to determine the optimal driving order and activate only necessary coils, thereby optimizing power transfer efficiency and reducing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single large transmitting coil is used to accommodate varying receiver positions, then the charging range is increased, but the magnetic field distribution becomes uneven and power transfer efficiency decreases
Solution Approach 1:
The patent divides a single large transmitting coil into multiple smaller transmitting coils arranged in an array. This segmentation allows the system to illuminate only the region where a receiver is present, creating a focused magnetic field that improves power transfer efficiency while maintaining a large overall charging range. The controller selectively activates specific coils based on receiver position detection.
2Loss of energy
If the current of each transmitting coil is adjusted according to the position of a receiving coil to achieve high efficiency, then power transfer efficiency improves, but the price, complexity and volume of the power conversion system increase
Solution Approach 1:
The patent adjusts the current parameter of each transmitting coil based on the detected position of the receiver. By changing current parameters rather than using complex hardware adjustments, the system achieves high power transfer efficiency while keeping the power conversion system relatively simple. The controller modifies current magnitude and phase to optimize efficiency without requiring complex additional 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
This approach enhances power transfer efficiency by selectively operating coils based on coupling coefficients, minimizing power loss and leakage magnetic fields, while maintaining system simplicity and reducing costs associated with current adjustments.
Implementation Method 1
wireless power transfer (WPT) technology... magnetic resonance wireless power transfer system... magnetic coupling
Implementation Method 2
coupling coefficient between coils of a transmitter Tx and coils of a receiver Rx... efficiency of the system increases as a coupling coefficient between coils of a transmitter and coils of a receiver increases
Data Source
AI summary
Disclosed a wireless power transfer system configured to selectively drive at least one transmitting coil among transmitting coils that are included in a transmitter; and an operation method of the wireless power transfer system, and more particularly, to a technology of verifying a coupling coefficient between each of transmitting coils and a receiving coil when the receiving coil is located on the transmitting coils and selectively driving at least one transmitting coil among the transmitting coils based on the verified coupling coefficient. According to an embodiment of the present disclosure, the wireless power transfer system includes a transmitter including the transmitting coils; a receiver including a receiving coil configured to receive wireless power from at least one transmitting coil among the transmitting coils; and a controller configured to verify a coupling coefficient between each of the transmitting coil and the receiving coil and selectively drive the at least one transmitting coil based on the verified coupling coefficient.