Nested Sensing Coil for Compact Wireless Charging

Solution Overview

Problem

Conventional non-contact charging systems for electronic devices, such as emergency lamps and camping lights, are bulky, costly, and not suitable for small products due to the large size and weight of sensing coils, leading to unstable charging and potential damage from data line connections.

Innovation Solution

A sensing device with a sensing transmitting module and receiving module, featuring a sensing coil and electromagnetic rod in a concavo-convex configuration, operating at a higher frequency range of 250 KHZ to 400 KHZ, reduces copper wire usage and size, enabling smaller, lighter, and more cost-effective charging solutions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a large sensing coil is used in non-contact charging equipment, then charging stability is improved, but the size and weight of the device increase

Engineering Contradiction:

Improvecharging stabilityVSAvoiddevice weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent applies nesting by placing the transmitting coil inside the receiving coil structure. The transmitting coil is positioned within the receiving coil's spatial envelope, allowing both coils to occupy overlapping three-dimensional space. This nested configuration enables stable non-contact charging while minimizing the overall device footprint and weight, as the coils share the same spatial region rather than requiring separate volumes.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent transitions from traditional planar coil arrangements to a three-dimensional nested configuration. By utilizing vertical and radial dimensions simultaneously, the coils achieve effective magnetic coupling without requiring large lateral dimensions. This dimensional transformation allows compact device design while maintaining charging stability through optimized magnetic field overlap in multiple spatial dimensions.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Reliability

If a large sensing coil is used in non-contact charging equipment, then charging stability is improved, but manufacturing cost increases

Engineering Contradiction:

Improvecharging stabilityVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The nested coil configuration reduces the total amount of copper wire required compared to traditional side-by-side or concentric coil designs. By optimizing the transmitting coil to fit within the receiving coil's spatial envelope, the patent minimizes wire length while maintaining effective magnetic coupling. This reduces material costs and simplifies manufacturing processes.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent optimizes coil parameters including wire diameter, turn density, and winding patterns to achieve efficient magnetic coupling with minimal material usage. By carefully selecting and adjusting these parameters, the design achieves stable charging performance while minimizing copper wire consumption and manufacturing complexity.

Inventive Principle:

Principle #35Parameter changes

3Productivity

If data line connection is used for charging, then charging function is achieved, but connection stability deteriorates and product damage risk increases

Engineering Contradiction:

Improvecharging functionVSAvoidconnection stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent replaces the mechanical data line connection system with a non-contact electromagnetic induction system. Instead of requiring physical plug-and-play connections that are prone to disconnection, looseness, and damage, the invention uses magnetic field coupling between transmitting and receiving coils to transfer power wirelessly. This eliminates mechanical contact points entirely, solving the connection stability and product damage issues while maintaining charging functionality.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

4Productivity

If traditional sensing coil configuration is used, then charging function is achieved, but device size becomes too large for small products

Engineering Contradiction:

Improvecharging functionVSAvoiddevice size

Core Design Contradiction:

ProductivityVSVolume of moving object

Solution Approach 1:

The patent applies nesting by placing the transmitting coil inside the receiving coil structure. The transmitting coil is positioned within the receiving coil's spatial envelope, allowing both coils to occupy overlapping three-dimensional space. This nested configuration enables stable non-contact charging while minimizing the overall device footprint and weight, as the coils share the same spatial region rather than requiring separate volumes.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent transitions from traditional planar coil arrangements to a three-dimensional nested configuration. By utilizing vertical and radial dimensions simultaneously, the coils achieve effective magnetic coupling without requiring large lateral dimensions. This dimensional transformation allows compact device design while maintaining charging stability through optimized magnetic field overlap in multiple spatial dimensions.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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

The solution provides stable, non-contact charging with improved efficiency and reduced weight and cost, making it suitable for small electronic products by utilizing resonant sensing circuits and minimizing copper wire usage.

Implementation Method 1

a large sensing coil in the output terminal of the sensing transmitting module encircles a small sensing coil in the input terminal of the sensing receiving module. When operates, electricity inputted from the plug is translated into magnetic energy by the large sensing coil

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

the sensing coil or the electromagnetic rod of the sensing receiving module is placed in magnetic field generated by the electromagnetic rod or the sensing coil, thereby generating sensing voltage

Methodology Applied

Scientific EffectMagnetic field coupling: Magnetic Field

Data Source

PatentUS9203259B2Sensing device, sensing charger and sensing emergency lamp

Publication Date: 2015.12.01 JIE DU ELECTRONICS TECH CO LTD GUANGDONG

AI summary

A sensing device includes a sensing transmitting module and a sensing receiving module respectively mounted in a first housing and a second housing. And an output terminal of the sensing transmitting module and an input terminal of the sensing receiving module are provided with a sensing coil and an electromagnetic rod respectively, the first housing and the second housings are cooperated with each other, and the electromagnetic rod is inserted into the sensing coil, so that the sensing coil or the electromagnetic rod is placed in magnetic field generated by the electromagnetic rod or the sensing coil thereby generating sensing voltage. The sensing parts are formed of the sensing coil and the electromagnetic rod, which significantly reduces the amount of the copper wires in the sensing coil and the electromagnetic rod, therefore the sensing device has a smaller size, lighter weight and lower cost.