Orthogonal Coil Openings Reduce Magnetic Coupling
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Solution Overview
Problem
In electronic circuits, adding multiple coils to a multilayer substrate for increased functionality often results in unnecessary coupling, leading to increased size and reduced Q value, which is undesirable for compact devices like mobile electronics.
Innovation Solution
A coil device configuration where a second coil is wound around a first coil with opposing current directions and orthogonal coil openings, allowing for independent operation and reduced magnetic coupling, thereby maintaining high Q values and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If another coil is added to the multilayer substrate to increase functionality, then the device functionality is improved, but unnecessary coupling occurs between coils leading to increased size and reduced Q value
Solution Approach 1:
The patent applies dimensional change by making the coil openings of the first and second coils orthogonal to each other. The first coil has its opening in the horizontal direction while the second coil has its opening in the vertical direction. This orthogonal arrangement in three-dimensional space allows both coils to coexist on the same multilayer substrate without magnetic coupling, preventing Q value reduction while maintaining compact size and enabling multiple functionalities.
2Reliability
If the transformer coil and other coil are arranged at a distance to prevent coupling, then the coupling is reduced, but the size of the multilayer substrate increases
Solution Approach 1:
Instead of separating coils in the horizontal plane which increases substrate area, the patent uses vertical separation by making coil openings orthogonal. The first coil opens horizontally while the second coil opens vertically, allowing both to occupy the same horizontal footprint without magnetic interference. This maintains compact substrate size while ensuring coil independence.
Solution Approach 2:
The patent implements nesting by placing the second coil directly over the first coil in the vertical stacking direction of the multilayer substrate. Both coils share the same horizontal space but are separated vertically, with their magnetic fields oriented orthogonally. This nested arrangement minimizes the horizontal area required while preventing coupling through orthogonal field orientation.
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 effectively prevents the reduction of Q values and maintains independence between coils, ensuring efficient operation and compact size in electronic devices.
Implementation Method 1
the first portion and the second portion extend or are folded so that directions of electric current flowing through the first portion and the second portion are opposite to each other
Data Source
AI summary
A coil device includes a first coil wound around a winding axis, and a second coil substantially overlapping the first coil when viewed from a winding axis direction of the first coil. The second coil includes first and second portions adjacent to each other in the winding axis direction. The first and second portions extend so that the directions of electric current flowing through the first and second portions are opposite to each other, and a coil opening is provided between the first and second portions.