Coupled Inductor Core Layout for Uniform Current Distribution
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Solution Overview
Problem
Conventional power conversion modules face issues with asymmetric equivalent series resistances and non-uniform current distribution in coupled inductors, leading to magnetic saturation and reduced performance due to differing distances of output terminals and non-symmetric resistances.
Innovation Solution
A magnetic device with a specific arrangement of magnetic legs and windings, where the input and output terminals of each winding are strategically positioned to equalize distances and reduce asymmetry, along with a magnetic core assembly that includes windings with different magnetic resistances to optimize current distribution and reduce magnetic saturation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional magnetic integration technology is used with asymmetric winding positions, then the structure is simple to manufacture, but the equivalent series resistances are not symmetric and current distribution is non-uniform
Solution Approach 1:
The patent intentionally introduces asymmetric air gaps in the magnetic core structure to compensate for the asymmetric winding positions. By making the air gaps asymmetric (different lengths in different magnetic paths), the magnetic flux distribution is adjusted to achieve symmetric equivalent series resistances despite the asymmetric winding layout, thus resolving the contradiction between manufacturing simplicity and current distribution uniformity
2Adaptability or versatility
If output terminals are positioned at different distances from the module output, then the circuit layout is flexible, but the equivalent series resistances become asymmetric
Solution Approach 1:
The patent changes the magnetic path parameters (air gap lengths) to compensate for the asymmetric terminal positions. By adjusting the air gap lengths in different magnetic paths, the magnetic flux distribution is optimized to ensure that the equivalent series resistances remain symmetric even when the output terminals are at different distances from the module output, thus resolving the contradiction between layout flexibility and resistance symmetry
3Stability of the object's composition
If lateral legs of the magnetic core are used without air gaps, then the magnetic path is continuous, but the legs are readily subjected to magnetic saturation
Solution Approach 1:
The patent introduces air gaps selectively in specific magnetic paths (lateral legs) where they are most needed to prevent saturation, while maintaining continuous magnetic paths in other regions. This localized modification of the magnetic structure allows the system to maintain overall magnetic path continuity while preventing saturation in critical areas, thus resolving the contradiction between path continuity and saturation resistance
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 enhances power conversion performance by equalizing current flow, minimizing equivalent series resistances, and reducing magnetic saturation, thereby improving efficiency and reducing the module's volume.
Implementation Method 1
a magnetic integration technology is used to make a plurality of inductors in the two power conversion circuits of the power conversion module to form a magnetic integration coupling relationship. That is, two inductors of the two power conversion circuits are formed as two coupled inductors
Implementation Method 2
Since the DC magnetic fluxes flowing through the lateral legs of the magnetic core are larger, the lateral legs of the magnetic core are readily subjected to magnetic saturation
Data Source
AI summary
A magnetic device includes a magnetic core assembly, a first winding and a second winding. The magnetic core assembly includes four magnetic legs and two winding grooves. An input terminal of the first winding is disposed within a first part of the first winding groove between the first magnetic leg and the second magnetic leg. An output terminal of the first winding is disposed within a second part of the second winding groove between the third magnetic leg and the fourth magnetic leg. An input terminal of the second winding is disposed within a first part of the second winding groove between the first magnetic leg and the fourth magnetic leg. An output terminal of the second winding is disposed within a second part of the first winding groove between the second magnetic leg and the third magnetic leg.