Eccentric Coil Component for Adjustable Magnetic Coupling
Solution Overview
Problem
Conventional coil components face challenges in achieving a desired coupling coefficient due to extreme variations in coupling coefficient when the inner magnetic paths of primary and secondary coils are aligned either on the same straight line or non-collinear straight lines, leading to difficulties in acquiring the desired inductance.
Innovation Solution
A coil component with a closed magnetic circuit structure, featuring primary and secondary coils with first and second coil portions where the second coil portion overlaps axially and has a smaller cross-sectional area, allowing for adjustable coupling coefficient and increased inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the inner magnetic path of the primary-side coil and the inner magnetic path of the secondary-side coil are arranged on the same straight line, then the coupling coefficient becomes extremely high, but it becomes difficult to acquire a desired coupling coefficient
Solution Approach 1:
The coil structure is divided into multiple segments: a first coil portion and a second coil portion, where the second coil portion is offset from the first coil portion in the axial direction. This segmentation allows independent control of magnetic coupling by adjusting the overlap between segments, enabling the coupling coefficient to be adjusted to desired values rather than being fixed at extreme levels.
Solution Approach 2:
The patent introduces axial direction offset as a new dimensional parameter for controlling magnetic coupling. By offsetting the second coil portion from the first coil portion in the axial direction, the overlap area between inner magnetic paths is reduced, providing a new degree of freedom for adjusting the coupling coefficient beyond simple radial or planar arrangements.
2Reliability
If the inner magnetic path of the primary-side coil and the inner magnetic path of the secondary-side coil are arranged on non-collinear straight lines, then the coupling coefficient becomes extremely low, but it becomes difficult to acquire the desired coupling coefficient
Solution Approach 1:
The patent creates a dynamic adjustment mechanism where the coupling coefficient can be varied by changing the axial offset distance between the first and second coil portions. This dynamic capability allows the system to adapt the coupling coefficient to desired values within a range, rather than being fixed at extremely low levels as in conventional non-collinear arrangements.
3Device complexity
If the core has the open magnetic circuit structure, then the structure is simple, but the inductance decreases
Solution Approach 1:
The patent changes the topological parameter of the magnetic circuit from open to closed structure. This parameter change increases the magnetic flux linkage and reduces magnetic reluctance, thereby increasing the inductance while maintaining structural efficiency. The closed magnetic circuit structure provides a continuous magnetic path that enhances the overall magnetic coupling and inductance of the transformer.
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 coil component effectively adjusts the coupling coefficient and increases inductance, enabling miniaturization and improved energy efficiency by optimizing the overlapping regions between the inner magnetic paths.
Implementation Method 1
a core with a closed magnetic circuit structure
Implementation Method 2
a secondary-side coil wound around the core, disposed in an axial direction of the primary-side coil, and magnetically coupled to the primary-side coil
Data Source
AI summary
A coil component includes a core with a closed magnetic circuit structure, a primary-side coil wound around the core, and a secondary-side coil wound around the core, disposed in an axial direction of the primary-side coil, and magnetically coupled to the primary-side coil. The primary-side coil and the secondary-side coil each include a first coil portion, and a second coil portion electrically connected to the first coil portion. The second coil portion overlaps in an axial direction of the first coil portion and an axis of the second coil portion is eccentric from an axis of the first coil portion. A cross-sectional area of an inner magnetic path of the second coil portion in a direction orthogonal to the axis is smaller than a cross-sectional area of an inner magnetic path of the first coil portion in a direction orthogonal to the axis.