Common Mode Choke Coil Winding Layout for Low-Frequency Mode Conversion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing common mode choke coils fail to effectively reduce mode conversion characteristics in the low-frequency range around 1 MHz, as they primarily focus on resistance and inductance components without adequately addressing capacitance components.
Innovation Solution
A common mode choke coil design featuring a two-layer winding region and a non-contact winding region, where the first wire and second wire are wound in a helical manner around the core, with the first wire having a longer length than the second wire to balance capacitance, resistance, and inductance components, thereby reducing mode conversion characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If distances between layer wound part and flange parts are increased, then parasitic capacitance is reduced, but device length increases
Solution Approach 1:
The patent utilizes the axial dimension of the winding core part to arrange different winding regions, allowing distance optimization for parasitic capacitance reduction without significantly increasing the overall device footprint in other dimensions
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 balances total impedance components, including resistance, inductance, and capacitance, significantly reducing mode conversion characteristics in the low-frequency range of 1 MHz.
Implementation Method 1
a first wire that is wound around the winding core part and is connected to the first terminal electrode and the second terminal electrode; and a second wire that is wound around the winding core part in the same winding direction as the first wire
Implementation Method 2
the distances between the layer wound part and the first flange part and the second flange part are secured by the bifilar wound parts being inserted between the first and second flange parts and the layer wound part
Data Source
AI summary
A winding core part includes a two-layer winding region, consisting of a first layer in which a first wire is wound around the winding core part and a second layer in which a second wire is wound around the first layer, and a non-contact winding region in which the first and second wires are wound without contacting each other. The non-contact winding region located is between the first flange part and the two-layer winding region, and the two-layer winding region includes switching parts that are for switching the axial direction positional relationship between turns of the first and second wires in the two-layer winding region and are parts in which the first and second wires cross each other. In the non-contact winding region, the first wire has a longer wire length than the second wire. The first wire has a longer coil length than the second wire through both regions.