Multilayer Inductor Asymmetric Coil Groups Non-Magnetic Layers
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Solution Overview
Problem
Existing multilayer inductors ensure a Q value but are insufficient in terms of voice distortion characteristics.
Innovation Solution
A multilayer inductor design with a multilayer body comprising laminated insulating layers, including both magnetic and non-magnetic insulating layers, where coil groups have different numbers of parallels, and non-magnetic insulating layers are strategically placed to suppress magnetic flux, reduce DC resistance, and improve hysteresis linearity and heat radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multilayer inductor uses a conventional structure with uniform coil patterns, then the Q value can be ensured, but the voice distortion characteristics are insufficient
Solution Approach 1:
The patent applies asymmetry by configuring different numbers of coil patterns in parallel across different coil groups (e.g., first coil group with 2 patterns, second coil group with 3 patterns, third coil group with 4 patterns). This asymmetric arrangement creates intentional magnetic flux distribution differences that suppress voice distortion while maintaining acceptable Q values through the overall series connection architecture.
Solution Approach 2:
The patent implements local quality by varying the parallel configuration of coil patterns in different regions (coil groups) of the inductor. Each coil group has a specific number of parallel patterns tailored to local requirements, creating non-uniform magnetic flux distribution that reduces voice distortion while the series connection of all groups maintains the overall Q value.
2Reliability
If the number of parallels in coil groups is increased to reduce DC resistance, then the Q value improves, but magnetic flux increases causing worse voice distortion
Solution Approach 1:
The patent segments the coil structure into multiple coil groups (first, second, third coil groups) with different numbers of parallel patterns (2, 3, and 4 respectively). This segmentation allows each group to contribute differently to the overall performance: groups with more parallels reduce DC resistance and improve Q value, while the variation in parallel numbers across groups creates magnetic flux suppression that reduces voice distortion.
Solution Approach 2:
The patent changes the parameter of parallel coil patterns across different coil groups rather than maintaining a uniform configuration. By varying the number of parallels (2, 3, 4) in different groups, the patent optimizes the balance between DC resistance (affected by parallel count) and voice distortion (affected by magnetic flux distribution), achieving both low resistance and low distortion simultaneously.
3Reliability
If coil groups with more parallels are used to reduce DC resistance, then the Q value is improved, but heat generation increases reducing reliability
Solution Approach 1:
The patent segments the inductor into multiple coil groups with progressively increasing parallel patterns (2, 3, 4). This segmentation distributes the current load across different groups, allowing groups with more parallels to handle higher current density and reduce overall DC resistance, while the distributed architecture prevents excessive heat concentration in any single group, managing thermal generation effectively.
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 design effectively improves voice distortion characteristics, ensures a high Q value, reduces DC resistance, and enhances reliability and heat radiation, thereby increasing the rated current and environmental resistance.
Implementation Method 1
since the non-magnetic insulating layer is provided in the coil groups with different numbers of parallels, a magnetic flux is suppressed, and thus voice distortion characteristics are improved
Implementation Method 2
the coil groups with different numbers of parallels are included, and thus a DC resistance is reduced and a Q value is ensured
Implementation Method 3
by disposing this coil group in the outer side portion in the lamination direction, heat radiation characteristics of a chip are improved
Data Source
AI summary
The multilayer inductor includes a multilayer body including a plurality of insulating layers laminated in a lamination direction, and a plurality of coil groups arranged in the multilayer body along the lamination direction and connected in series. Each of the coil groups includes a plurality of coil patterns respectively provided on the insulating layers and laminated in the lamination direction, and is configured by connecting a plurality of pattern groups in series. Each of the pattern groups is formed by connecting n (n is a positive integer) coil patterns in parallel. The number of parallels n of at least one of the coil groups is different from the number of parallels n of another coil group. The insulating layers include magnetic and non-magnetic insulating layers. At least one of the insulating layers adjacent to one of the coil patterns is the non-magnetic insulating layer.