Multi-cell Magnetic Structure for Wireless Power Transfer
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Solution Overview
Problem
Efficient wireless power transfer over large distances is hindered by high air gap reluctance, which reduces inductive coupling and overall efficiency in existing IPT systems.
Innovation Solution
A multi-cell magnetic structure with elongated lateral plates and multiple windings is introduced, splitting the reluctance into multiple cells to spread magnetic flux and decrease air gap reluctance, thereby increasing inductive coupling and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a large air gap is used to transfer power over greater distances, then the wireless power transfer distance is improved, but the air gap reluctance increases and inductive coupling efficiency deteriorates
Solution Approach 1:
The magnetic structure is divided into multiple cells (first cell, second cell, third cell, fourth cell) with each cell containing windings and magnetic core segments. This segmentation allows the magnetic flux to be distributed across multiple parallel paths through the air gap, reducing the overall reluctance and improving coupling efficiency while maintaining a large air gap distance for wireless power transfer
Solution Approach 2:
Multiple magnetic core segments (first through fourth segments in the primary structure, first through fourth segments in the secondary structure) are combined to form a unified multi-cell magnetic structure. The windings on different cells are electrically connected in series or parallel, merging their magnetic effects to collectively reduce air gap reluctance and enhance the overall inductive coupling between primary and secondary sides
2Length of stationary object
If a large air gap is used to transfer power over greater distances, then the wireless power transfer distance is improved, but the magnetic flux penetration through the air gap becomes harder
Solution Approach 1:
The magnetic structure is divided into multiple cells (first cell, second cell, third cell, fourth cell) with each cell containing windings and magnetic core segments. This segmentation allows the magnetic flux to be distributed across multiple parallel paths through the air gap, reducing the overall reluctance and improving coupling efficiency while maintaining a large air gap distance for wireless power transfer
Solution Approach 2:
The invention changes the magnetic circuit parameters by introducing multiple parallel flux paths through the multi-cell structure. This effectively reduces the equivalent reluctance of the air gap by creating multiple concurrent magnetic pathways, making it easier for magnetic flux to penetrate through the large air gap distance
3Loss of energy
If multiple cells and windings are added to reduce air gap reluctance, then the inductive coupling is improved, but the device complexity increases
Solution Approach 1:
The magnetic structure is divided into multiple cells (first cell, second cell, third cell, fourth cell) with each cell containing windings and magnetic core segments. This segmentation allows the magnetic flux to be distributed across multiple parallel paths through the air gap, reducing the overall reluctance and improving coupling efficiency while maintaining a large air gap distance for wireless power transfer
Solution Approach 2:
Each cell in the multi-cell structure serves multiple functions: it provides a magnetic flux path, contributes to reducing air gap reluctance, and can be independently configured with windings. The same basic cell structure is repeated and combined to achieve the overall goal, making the complex structure modular and manageable while maintaining high inductive coupling efficiency
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 multi-cell structure enhances inductive coupling and power transfer efficiency while reducing susceptibility to longitudinal misalignment, achieving higher efficiency in wireless power transfer across larger distances.
Implementation Method 1
The primary and the secondary are made out of magnetically permeable material and are separated by an air gap. The primary and the secondary are winded around the center rods.
Implementation Method 2
The primary and the secondary are made out of magnetically permeable material. The magnetic structure consists of multiple cells and windings connected in the same manner.
Data Source
AI summary
An improved primary or secondary side pad for a wireless transformer for inductive power transfer through an air gap is provided. The primary or secondary side pad includes a first plate, a second plate, and at least two rods which are linking the first and the second plate, where a winding is wound around each rod. A wireless transformer for inductive power transfer through an air gap includes a primary side pad and a secondary side pad of the transformer which is identical in shape and size.