Concentric Coil Q-Factor Selection for Wireless Power
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Solution Overview
Problem
Current wireless power systems face inefficiencies in coil technologies and object detection, particularly in determining the appropriate coil configuration for efficient power transfer and sensing objects above transmitter pads, leading to prolonged identification processes and potential incorrect coil selection.
Innovation Solution
A wireless power transmitter with a plurality of concentric coils and a controller that selects the appropriate coil configuration based on measured Q-factor differences, allowing for efficient power transfer by determining the size and type of the receive coil through monitoring impedance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple concentric coils are used for wireless power transmission, then the adaptability to different device sizes is improved, but the device complexity increases
Solution Approach 1:
The transmitter coil is segmented into multiple concentric coils (first concentric coil, second concentric coil, etc.) that can be independently activated. Each concentric coil is designed to optimally charge devices of specific size ranges, allowing the system to adapt to different device types without requiring a completely different transmitter design for each device size.
Solution Approach 2:
The system dynamically selects which concentric coil to activate based on real-time Q-factor measurements. The controller continuously monitors the Q-factor of each concentric coil and activates only the coil with the highest Q-factor, enabling the transmitter to adapt its configuration dynamically rather than requiring manual selection or fixed configuration.
2Measurement precision
If Q-factor measurement is performed for each concentric coil configuration, then the precision of coil selection is improved, but the measurement time increases
Solution Approach 1:
The system performs preliminary Q-factor measurements on all concentric coils before initiating the charging process. By measuring the Q-factor of each concentric coil in advance and storing these values, the system is ready to immediately select the optimal coil without delays during the actual charging setup, thus reducing identification time while maintaining selection accuracy.
Solution Approach 2:
The controller automatically performs Q-factor measurements and selects the optimal concentric coil without requiring user intervention or external assistance. The system self-evaluates the Q-factor of each coil configuration and autonomously determines which coil to activate, streamlining the process and reducing overall identification time.
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 enables rapid and accurate selection of the optimal coil configuration for efficient wireless power transfer, reducing identification time and ensuring correct power delivery to various devices, such as wearables, smartphones, and tablets.
Implementation Method 1
a transmitter driving a transmit coil and a receiver with a receiver coil placed proximate to the transmit coil. The receiver coil receives the wireless power generated by the transmit coil
Implementation Method 2
determining the appropriate coil configuration for efficient power transfer and sensing objects above transmitter pads
Data Source
AI summary
In accordance with embodiments of the present invention, a wireless power transmitter includes a transmit coil that includes a plurality of concentric coils; a switch circuit coupled to the plurality of concentric coils; a driver coupled to provide a voltage to the switch circuit; and a controller coupled to the switch circuit, the controller providing control signals to the switch circuit selecting to provide the voltage across one or more of the plurality of concentric coils depending on a Q-factor measuring in the presence of a receive coil. A method of operating a wireless power transmitter includes determining a measured Q-factor for each of a plurality of configurations of concentric transmit coils; determining a difference between each of the measured Q-factors and a standard Q-factor; and selecting one of the plurality of configurations based on the differences.