Wireless Power Resonant Inductor Asymmetry for Heat Control
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Solution Overview
Problem
Conventional wireless power transceivers using magnetic materials for pads face challenges in enclosed spaces due to low permeability and high heat generation, limiting their practical application.
Innovation Solution
The wireless power receiver and transmitter employ asymmetrically designed transmitting and receiving side resonant inductors with different inductances to control current and magnetic flux, using materials with varying permeabilities to reduce heat generation and improve flux distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic materials are used for pads in wireless power transceivers, then magnetic flux distribution is improved, but heat generation increases and permeability decreases in enclosed spaces
Solution Approach 1:
The patent applies asymmetry by setting different inductance values for the transmitting side resonant inductor and receiving side resonant inductor. Specifically, the receiving side resonant inductor has a lower inductance value than the transmitting side resonant inductor, creating an asymmetric configuration that optimizes magnetic flux distribution while reducing heat generation in enclosed spaces.
Solution Approach 2:
The patent changes the inductance parameters of the resonant inductors to resolve the contradiction. By adjusting the inductance values asymmetrically (receiving side < transmitting side), the system achieves better magnetic flux distribution and reduced heat generation simultaneously, rather than using equal inductance values as in conventional designs.
2Reliability
If magnetic materials with high permeability are used for pads, then magnetic flux generation is improved, but heat generation temperature increases rapidly
Solution Approach 1:
The asymmetric inductance configuration (receiving side resonant inductor having lower inductance than transmitting side resonant inductor) balances the magnetic flux generation between transmitting and receiving pads, preventing excessive heat generation even when high permeability magnetic materials are used.
Solution Approach 2:
By changing the inductance parameters asymmetrically, the patent controls the current distribution through the magnetic materials, thereby managing heat generation temperature while maintaining effective magnetic flux generation for power transmission.
3Device complexity
If conventional symmetric resonant inductor configuration is used, then device simplicity is maintained, but heat generation and magnetic flux uniformity are compromised
Solution Approach 1:
The patent deliberately introduces asymmetry in the resonant inductor configuration, setting the receiving side resonant inductor inductance lower than the transmitting side resonant inductor inductance. This asymmetric design improves magnetic flux uniformity and reduces heat generation, accepting increased design complexity as a necessary trade-off for performance improvement.
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 effectively reduces heat generation and enhances magnetic flux uniformity, improving compatibility and efficiency in wireless power transmission.
Implementation Method 1
a receiving side resonant network including a receiving side resonant inductor that controls power supplied to the receiving pad
Implementation Method 2
Magnetic materials are being used as the material of pads in recent years, in order to uniformly distribute a magnetic flux generated by transmitting/receiving pads
Data Source
AI summary
A wireless power receiver includes a receiving pad configured to receive power transmitted from a wireless power transmitter including a transmitting pad and a transmitting side resonant inductor, and a receiving side resonant network including a receiving side resonant inductor that controls power supplied to the receiving pad. Further, a first inductance of the receiving side resonant inductor and a second inductance of the transmitting side resonant inductor are determined to be different from each other.