Coupled Inductor Leakage Control via Top Magnetic Element
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Solution Overview
Problem
Existing DC-to-DC converters with multiphase coupled inductors face challenges in controlling leakage inductance, which complicates the design and increases the footprint due to the need for large window widths and complex core geometries, affecting efficiency and volume utilization.
Innovation Solution
The proposed M-winding coupled inductor design includes a top magnetic element and a gap with adjustable thickness to control leakage inductance, allowing for a more compact and efficient configuration by reducing the window widths and simplifying the core geometry, while maintaining desired leakage inductance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If large window widths are used to control leakage inductance, then leakage inductance control is achieved, but the footprint and core complexity increase
Solution Approach 1:
The patent introduces a vertical dimension by placing a top magnetic element above the planar core structure. This top element extends over multiple connecting magnetic elements and windings, creating a three-dimensional magnetic path that controls leakage inductance without requiring large horizontal window widths. The gap between the top magnetic element and the planar core structures provides the necessary leakage control in the vertical dimension.
Solution Approach 2:
The magnetic core is divided into multiple discrete components: a planar core with multiple connecting magnetic elements, end magnetic elements, and a separate top magnetic element. This segmentation allows independent optimization of each component and enables flexible assembly to achieve desired leakage inductance values without increasing overall footprint.
2Manufacturing precision
If complex core geometries are used to control leakage inductance, then leakage inductance control is achieved, but manufacturing complexity increases
Solution Approach 1:
The core is segmented into simple, planar components that can be manufactured separately using standard techniques. The top magnetic element is a separate component that can be manufactured independently and then positioned above the planar core structures, avoiding the need for complex monolithic core geometries.
Solution Approach 2:
Instead of creating complex three-dimensional core geometries, the patent uses a simple planar core structure combined with a top magnetic element positioned in the vertical dimension. This approach controls leakage inductance through the vertical gap distance rather than through complex horizontal core shaping.
3Manufacturing precision
If large window widths are used for leakage sections, then leakage inductance is sufficiently large, but volume utilization decreases
Solution Approach 1:
The patent moves the leakage control mechanism from the horizontal plane to the vertical dimension. The gap between the top magnetic element and the planar core structures provides the necessary leakage path without requiring large horizontal window widths, thereby improving volume utilization.
Solution Approach 2:
The inductor uses a composite magnetic structure combining planar core materials with a separate top magnetic element. This composite approach allows optimization of magnetic properties and leakage control independently, achieving desired leakage inductance values with compact volume.
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 design enables a smaller footprint, easier adjustment of leakage inductance, improved magnetic coupling, and reduced core losses, facilitating the use of lower permeability materials and shorter windings, thus enhancing the efficiency and manufacturability of the coupled inductor.
Implementation Method 1
at least one top magnetic element adjacent to and extending at least partially over at least two of the M connecting magnetic elements to provide a path for magnetic flux between the first and second end magnetic elements
Implementation Method 2
M-winding coupled inductor includes a first end magnetic element, a second end magnetic element, M connecting magnetic elements, and M windings
Data Source
AI summary
An M-winding coupled inductor includes a first end magnetic element, a second end magnetic element, M connecting magnetic elements, and M windings. M is an integer greater than one. Each connecting magnetic element is disposed between and connects the first and second end magnetic elements. Each winding is wound at least partially around a respective one of the M connecting magnetic elements. The coupled inductor further includes at least one top magnetic element adjacent to and extending at least partially over at least two of the M connecting magnetic elements to provide a magnetic flux path between the first and second end magnetic elements. The inductor may be included in an M-phase power supply, and the power supply may at least partially power a computer processor.