Multilayer Coil Filter Layout for Fast Charge Supply and Noise Reduction
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Solution Overview
Problem
Existing filter circuits that use mutual inductance between coils for noise reduction face issues with delayed charge supply to circuit components due to high inductance, leading to increased component count and manufacturing costs.
Innovation Solution
A coil component design with a first coil having lower inductance than a second coil, where the openings of both coils overlap partially, and a capacitor connected to the third electrode, allowing for improved charge supply by reducing the inductance of the first coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If coils are included in the power supply line to generate mutual inductance for noise reduction, then noise reduction effect is improved, but charge supply speed to circuit component deteriorates due to high inductance
Solution Approach 1:
The coil component is segmented into a first coil and a second coil with different inductance values. The first coil has lower inductance to minimize impact on charge supply speed, while the second coil has higher inductance to provide adequate noise reduction. This segmentation allows each coil to optimize for its specific function within the same component.
Solution Approach 2:
Different parts of the coil component have different inductance characteristics tailored to their specific functions. The first coil positioned closer to the circuit component has lower inductance for fast charge supply, while the second coil has higher inductance for noise filtering. This local differentiation of properties resolves the contradiction between speed and noise reduction.
2Reliability
If additional capacitor is added to maintain charge supply performance, then charge supply reliability is improved, but manufacturing cost and product size increase
Solution Approach 1:
The coil component serves multiple functions: it provides noise reduction through inductance while simultaneously minimizing impact on charge supply speed through its segmented design. The first coil with lower inductance ensures fast charge supply, reducing the need for additional capacitors and maintaining reliability without increasing component count.
Solution Approach 2:
Instead of adding another capacitor to ensure charge supply reliability, the invention uses the first coil's lower inductance characteristic to directly enable fast charge supply. This approach copies the functional benefit of a capacitor (fast response) through an inductive element, avoiding the need for additional components.
3Speed
If first coil has lower inductance for fast charge supply, then charge supply speed is improved, but noise reduction capability may deteriorate
Solution Approach 1:
The first coil and second coil are merged into a single integrated coil component with overlapping openings. This combination allows the lower-inductance first coil to enable fast charge supply while the higher-inductance second coil provides noise reduction capability, achieving both functions within one component.
Solution Approach 2:
The coils are arranged in a three-dimensional configuration with overlapping openings when viewed from the main surface direction. This spatial arrangement in another dimension allows both coils to coexist and function simultaneously without interfering with each other's performance characteristics.
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 enhances the rising of electric charge supply to circuit components, reducing manufacturing costs and component count while maintaining effective noise reduction.
Implementation Method 1
mutual inductance M caused by the magnetic coupling between two coils
Data Source
AI summary
An electronic device includes an IC mounted on a substrate and a filter circuit connected to the IC. The filter circuit includes a coil component and a capacitor. The coil component includes a multilayer body, a first coil including a portion of multiple wiring patterns laminated in the multilayer body, a second coil provided on layers different from those of the first coil and including a portion of the multiple wiring patterns, and first, second and third electrodes provided on side surfaces. An opening of the first coil is at least partially overlapped with an opening of the second coil when viewed from a main surface direction. The third electrode is grounded via the capacitor. The first coil has an inductance lower than that of the second coil.