Flexible Wireless Power Receiver for Head-Mounted Device Charging
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Solution Overview
Problem
Head-mounted devices face challenges in wireless charging due to the requirement for a 30 mm diameter surface, which is not feasible for their compact design, leading to reduced performance when using existing wireless power systems.
Innovation Solution
A flexible wireless power system receiver is integrated into the head-mounted device, allowing it to switch between a deployed position for efficient charging and a stored position to minimize size, using inductive coupling with a spring, foldable, or rollable inductive coil configurations, and can be embedded within an optical lens for compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional wireless power receiver with 30 mm diameter is used, then wireless charging performance is improved, but the device size and weight increase significantly
Solution Approach 1:
The patent applies the dynamics principle by making the receiver flexible and capable of changing its configuration between deployed and stored states. The receiver can be deployed to a sufficient diameter for effective wireless charging when needed, and then folded or rolled into a compact form for normal device wear, thus resolving the contradiction between charging performance and device size
Solution Approach 2:
The patent utilizes flexible shells and thin films by employing a flexible receiver that can be folded or rolled. This flexible structure allows the receiver to achieve the necessary diameter for wireless charging operation while maintaining a compact form factor when stored within the head-mounted device, effectively addressing the size-performance trade-off
2Duration of action of moving object
If battery capacity is increased to extend usage time, then duration of action is improved, but weight increases which is not acceptable for head mounted devices
Solution Approach 1:
The patent applies the self-service principle through wireless charging capability, allowing the device to recharge without external intervention or connection to power sources. The flexible receiver enables the battery to be recharged anywhere within range of a wireless charging transmitter, effectively extending usage duration without adding battery weight
Solution Approach 2:
The patent extracts the charging function from the physical battery structure by implementing wireless charging. Instead of relying solely on a larger battery to extend usage time, the system separates the energy storage function (battery) from the energy replenishment function (wireless receiver), allowing extended operational duration through frequent wireless top-ups rather than increasing battery capacity
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
Enables efficient wireless charging of the device's battery while maintaining a compact form factor, allowing the receiver to be positioned optimally for power reception without increasing the device's overall dimensions.
Implementation Method 1
a flexible wireless power system receiver connected to the battery through at least one electrical connection mean, the flexible wireless power system receiver being arranged to receive an electromagnetic field so as to allow charging of the battery
Data Source
AI summary
A head mounted device intended to be worn by a wearer comprising: —a battery, and —a flexible wireless power system receiver connected to the battery through at least one electrical connection mean, the flexible wireless power system receiver being arranged to receive an electromagnetic field so as to allow charging of the battery through the electrical connection means.