Laminated Inductor Module with Controlled Magnetic Coupling
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Solution Overview
Problem
The reduction in size of devices containing transformers leads to increased magnetic coupling between inductor elements and current transformers, causing malfunctions due to reduced distance between components.
Innovation Solution
An inductor module with a current detection coil conductor and an inductor element coil conductor, where the coupling coefficients between these conductors and the main line conductor are carefully managed to minimize magnetic coupling, allowing for independent operation and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the device is reduced by using a laminated transformer, then the device size is reduced, but the distance among elements is reduced causing magnetic coupling between the transformer and inductor element
Solution Approach 1:
The patent segments the device into functionally independent modules: a laminated transformer module and an inductor element module. Each module is designed with specific magnetic coupling characteristics, allowing them to be placed close together physically while maintaining functional independence through controlled magnetic field interactions.
Solution Approach 2:
The patent applies different magnetic coupling characteristics to different parts of the system. The current detection coil is designed with strong magnetic coupling to the main line conductor for effective current sensing, while the inductor element is designed with weak magnetic coupling to both the transformer and detection coil, creating localized magnetic field zones that prevent interference.
2Device complexity
If the distance among elements is reduced to achieve compact design, then the device size is reduced, but magnetic coupling between components occurs causing malfunctioning
Solution Approach 1:
The patent controls magnetic coupling by adjusting geometric parameters of the components. The inductor element's winding axis is oriented perpendicular to the magnetic flux direction from the transformer, and the spacing and dimensions are optimized to ensure weak coupling coefficients, transforming the magnetic field interaction parameters to eliminate harmful effects.
Solution Approach 2:
The patent converts the potentially harmful magnetic coupling into a beneficial arrangement where the inductor element's weak coupling to both the transformer and detection coil is deliberately designed. This weak coupling prevents interference while the detection coil maintains strong coupling for accurate current sensing, turning what could be interference into functional independence.
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
Enables effective current detection and use as an inductor element while preventing magnetic coupling issues, allowing for a smaller and more efficient electric power transmission system.
Implementation Method 1
when current flows through the main line conductor, magnetic flux is generated from the main line conductor, and this magnetic flux is interlinked with the current detection coil conductor, thereby generating induced electromotive force in the current detection coil conductor
Data Source
AI summary
An inductor module includes a laminate where multiple insulator layers are laminated, a main line conductor in the shape of a straight line formed on the laminate, a current detection conductor that is formed on the laminate and magnetically coupled with the main line conductor, and coil conductors that are formed on the laminate and constitute an inductor element. An absolute value of a coupling coefficient between the main line conductor and inductor element, and an absolute value of a coupling coefficient between the current detection conductor and the inductor element, are each smaller than an absolute value of a coupling coefficient between the main line conductor and the current detection conductor. Thus, an inductor module that detects current and is used as an inductor element, and an electric power transmission system including the inductor module, are provided.