Resonant Wireless Charging for Electric Toothbrushes
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Solution Overview
Problem
Existing wireless charging systems for devices like electric toothbrushes are inflexible, requiring precise positioning and cannot charge multiple devices simultaneously, making them difficult for children, seniors, or people with disabilities to use, and are limited in charging area and compatibility with different device sizes and shapes.
Innovation Solution
A wireless charging system comprising a charging station with a transmitter resonant circuit and a receiver resonant circuit in the device, allowing for flexible placement and angle of the device during charging, with a high resonant frequency to maintain efficient power transfer even with varying distances and angles, and a sensing mechanism to detect and enable charging of multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dedicated charging transmitter with built-in inflexibility is used, then charging efficiency is maintained, but the charging area is limited and only one device can be charged at a time
Solution Approach 1:
The charging base is designed with multiple independent charging transmitters (first charging transmitter, second charging transmitter, etc.), each capable of independently charging a device. This allows the base to serve multiple devices simultaneously while maintaining efficient charging for each device individually, thus achieving both charging efficiency and adaptability.
Solution Approach 2:
The charging base is segmented into multiple independent charging transmitters rather than using a single unified transmitter. Each transmitter can operate independently, allowing flexible placement of multiple devices at different positions and angles without interfering with each other's charging efficiency.
2Reliability
If rigid and careful handling is required for device placement, then coupling between device and charging station is ensured, but ease of operation deteriorates
Solution Approach 1:
The charging transmitters are designed to be flexible in position and orientation, allowing devices to be placed at different angles and positions without requiring precise alignment. The system adapts to various device placements while maintaining effective coupling, making operation easier for users including children, seniors, or people with disabilities.
3Use of energy by moving object
If a limited charging area with inflexible placement is used, then power transfer is optimized, but the ability to charge multiple devices simultaneously is lost
Solution Approach 1:
The charging base is divided into multiple independent charging transmitters, each with its own optimized power transfer capability. This segmentation allows multiple devices to be charged simultaneously at different positions without compromising the power transfer efficiency for each individual device.
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 flexible and efficient wireless charging of multiple devices of varying sizes and shapes, including electric toothbrushes, with improved charging efficiency and compatibility, allowing for free positioning and angle adjustments while optimizing power transfer.
Implementation Method 1
a transmitter resonant circuit including a transmitter coupling coil configured to oscillate at a resonant frequency
Implementation Method 2
a receiver resonant circuit including a receiver coupling coil wirelessly coupled to the transmitter coupling coil
Data Source
AI summary
A system for wireless electrical charging is disclosed. The system may comprise a charging station and one or more electric devices. The charging station may comprise an input node configured to receive a power input, and a transmitter resonant circuit including a transmitter coupling coil configured to oscillate at a resonant frequency. The one or more electric devices may comprise a receiver resonant circuit including a receiver coupling coil wirelessly coupled to the transmitter coupling coil, and a DC voltage charger configured to charge one or more batteries in the electric device.