Multi-Orientation Wireless Power Receiver Coils for Posture Tolerance
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Solution Overview
Problem
Existing wireless power receiving devices with complicated three-dimensional housings face inefficiencies in power reception due to varying postures on a power transmission stand, leading to reduced power reception or failure.
Innovation Solution
The implementation of a wireless power receiving device featuring two power receiving coils of different shapes (planar spiral and cylindrical solenoid) and resonance circuits, allowing for efficient power reception regardless of posture, by coupling with magnetic fields in multiple directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single planar coil is used in a hearing aid with a complicated three-dimensional housing, then the device can be compact, but power receiving efficiency significantly decreases when the device is not disposed in a specific posture on a power transmission stand
Solution Approach 1:
The single planar coil is segmented into two separate coils with different orientations: a first planar coil and a second solenoid coil. Each coil is optimized for receiving power from a specific direction, allowing the device to maintain high power receiving efficiency regardless of its placement posture on the charging stand.
Solution Approach 2:
The invention transitions from a single-plane coil configuration to a three-dimensional multi-orientation coil arrangement. The first planar coil receives power from one direction while the second solenoid coil receives power from a different direction, adding spatial dimensionality to the power receiving capability and eliminating posture dependency.
2Reliability
If multiple power receiving coils with different orientations are used, then power receiving efficiency is maintained across various postures, but device complexity increases
Solution Approach 1:
The two coils with different orientations serve multiple functions: the first planar coil optimizes power receiving from one direction while the second solenoid coil optimizes power receiving from another direction. This multi-functional arrangement ensures that at least one coil is always effectively coupled with the magnetic field regardless of the device's placement posture, achieving universal power receiving capability.
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 configuration enhances power reception efficiency by increasing the degree of freedom in device placement and effectively utilizing spatial regions within the housing, ensuring reliable power supply to the load.
Implementation Method 1
a first power receiving coil and a second power receiving coil which each generate a power receiving current by being coupled to an external magnetic field
Implementation Method 2
a first power receiving resonance circuit configured to include the first power receiving coil and a first resonance capacitor, and a second power receiving resonance circuit configured to include the second power receiving coil and a second resonance capacitor
Data Source
AI summary
A wireless power receiving device includes power receiving coils, power receiving resonance circuits, and rectifier circuits. The power receiving coils each generate a power receiving current by being coupled to an external magnetic field. Each power receiving resonance circuit includes a power receiving coil and a capacitor. The rectifier circuits are connected to the power receiving resonance circuits and rectify resonance currents, respectively. The power receiving coils are planar spiral coils, and the power receiving coils are cylindrical solenoid coils. The power receiving coils and the power receiving coils are disposed in a state where a direction orthogonal to a plane of the spiral coil and axes of cylindrical shapes of the solenoid coils are not parallel to each other. A power adding circuit adds DC outputs of the rectifier circuits at a subsequent stage of the rectifier circuits and supplies power to a load.