Induction Charging Coil Core Unit Field Bundling
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Solution Overview
Problem
Hand tool inductive charging coil devices face challenges in effectively shielding electronics and battery cells from alternating electromagnetic fields, leading to increased leakage currents, heating, and potential damage due to insufficient field strength reduction.
Innovation Solution
The use of a core unit with a projection surface that covers the electronics and cell unit, combined with an electrically conductive material layer, to bundle and reflect electromagnetic fields, reducing field strength by at least 50% and preventing leakage currents, while the core unit is formed from magnetic materials and embedded core elements with varying compositions for optimal magnetic field bundling and mechanical robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding unit is used to reduce electromagnetic field strength, then the field strength reduction is improved, but the device complexity increases
Solution Approach 1:
The core unit combines both magnetic field bundling function and shielding function in a single integrated component. The core unit with magnetic material bundles the electromagnetic field while simultaneously shielding the electronics and cell unit, eliminating the need for separate shielding structures and reducing overall device complexity.
Solution Approach 2:
The core unit serves multiple functions: it acts as a magnetic field bundling element to concentrate the electromagnetic field for efficient energy transfer, and simultaneously functions as a shielding element to protect sensitive components. This multi-functionality resolves the contradiction by achieving field strength reduction without adding extra dedicated shielding components.
2Object-affected harmful factors
If the core unit projection surface covers the electronics and cell unit, then the shielding effectiveness is improved, but the area occupied increases
Solution Approach 1:
The core unit is positioned and sized to provide localized shielding precisely where needed - covering the electronics and cell unit in the projection direction. This targeted approach ensures shielding effectiveness for vulnerable components without unnecessarily increasing the overall area occupied by the charging device.
3Use of energy by moving object
If magnetic material is used to bundle electromagnetic field, then the energy transfer efficiency is improved, but the weight increases
Solution Approach 1:
The core unit utilizes magnetic materials with optimized properties to achieve effective electromagnetic field bundling. By selecting appropriate magnetic materials and configuring the core unit structure, the patent achieves good energy transfer efficiency while managing the weight increase through material optimization rather than excessive material usage.
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 significantly reduces the impact of electromagnetic fields on electronics and battery cells, preventing damage, extending their service life, and enhancing the efficiency of the inductive charging process by minimizing heating and leakage currents.
Implementation Method 1
The coil unit is preferably provided to convert an alternating electrical current into an alternating electromagnetic field and/or vice versa
Implementation Method 2
The core unit can advantageously bundle the alternating electromagnetic field in such a way that only reduced field strengths occur in the area of the electronics unit and/or the cell unit
Implementation Method 3
The shielding unit is intended to reduce a field strength of the alternating electromagnetic field propagating in the direction from the coil unit to the electronics unit and/or the cell unit to be shielded
Implementation Method 4
The coil unit is intended to send and/or preferably receive electrical energy in at least one operating state
Data Source
Figure 1~2
Figure 3~4
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AI summary
The invention relates to an induction charging coil device (10a-i), especially an induction charging coil device for a hand tool, comprising at least one coil unit (12a-i; 12'a; 12'e-f) having at least one shielding unit (78a-1), at least one core unit (14a-i) and at least one electronic unit (16a-i) to be shielded and/or a cell unit (18a-b; 18e-f). According to the invention, a projection surface (20a-i) of the core unit (14a-i) covers at least substantially the electronic unit (16a-i) to be shielded and/or the cell unit (18a-b; 18e-f) upon projection in the direction of a winding axis (22a-i) of the coil unit (12a-i).