Compact Common Mode Choke Coil Design
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Solution Overview
Problem
Existing electric circuits with common mode choke coils require significant space due to the size of ferrite cores, making them difficult to integrate into electronic devices.
Innovation Solution
A compact electric circuit design featuring a multilayer body with overlapping inductors that form a common mode choke coil, allowing for reduced size and increased impedance by strategically arranging coils and magnetic body portions to optimize magnetic coupling and flux orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ferrite core is used to form a common mode choke coil, then effective common mode noise suppression is achieved, but the size and space required for the electric circuit increases
Solution Approach 1:
The patent embeds magnetic body portions inside the coil structure, with multiple magnetic body portions (first, second, third magnetic body portions) positioned within the coil's internal space. This nesting approach allows the magnetic components to occupy the same spatial envelope as the coil, significantly reducing the overall volume of the common mode choke coil while maintaining effective magnetic coupling and noise suppression performance
Solution Approach 2:
The patent transitions from a traditional planar arrangement to a three-dimensional stacked configuration by placing magnetic body portions at different heights (first height, second height, third height) within the coil. This vertical stacking in the height dimension allows compact integration without increasing the footprint area, effectively reducing the overall size while preserving the common mode choke coil's functional performance
2Reliability
If multiple inductors are arranged to form a common mode choke coil, then impedance is increased for better noise suppression, but device complexity increases
Solution Approach 1:
The patent combines multiple inductors (first inductor, second inductor, third inductor) into a single integrated common mode choke coil structure where they share common connection nodes and are positioned around shared magnetic body portions. This merging approach increases the effective impedance for common mode noise suppression while avoiding the complexity of completely separate inductor assemblies, as the inductors work together as a unified noise filtering structure
Solution Approach 2:
The multiple inductors in the patent serve dual functions: they individually provide inductive reactance and collectively form a common mode choke coil that suppresses common mode noise. The magnetic body portions also serve multiple purposes by providing magnetic coupling for all inductors and defining the compact three-dimensional structure. This multi-functionality reduces overall device complexity compared to separate components performing each function independently
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 achieves a reduction in size and height of the electric circuit while maintaining effective common mode noise suppression, enabling integration into smaller electronic device spaces.
Implementation Method 1
when a common mode signal is inputted to the first inductor, the second inductor and the third inductor, the orientation of a magnetic field produced in the first axis by the first inductor and the third inductor is the opposite from an orientation of a magnetic field produced in the second axis by the second inductor
Data Source
AI summary
The electric circuit includes a first inductor and a third inductor that, when viewed in plan view from a first direction, wind around a first axis extending in the first direction, and a second inductor that, when viewed in plan view from the first direction, winds around a second axis extending in the first direction. A second region where the second inductor is provided overlaps, in the first direction, with a first region where the first inductor is provided or a third region where the third inductor is provided. When a common mode signal is inputted to the first inductor to third inductor, the orientation of a magnetic field produced in the first axis by the first inductor and the third inductor is opposite from the orientation of a magnetic field produced in the second axis by the second inductor.