Multilayer Coil Layout for Static Charge Short-Circuit Prevention
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Solution Overview
Problem
The generation of unexpected voltages due to static electricity can cause potential differences between coils in multilayer coil arrays, leading to short circuits and degradation of electrical characteristics.
Innovation Solution
A multilayer coil design with extended conductors connecting coils in a lamination direction, ensuring direct electrical connections between specific external electrodes to prevent short circuits and maintain insulation resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple coils are provided in a multilayer coil array for high current DC-DC converters, then the current handling capability is improved, but the risk of short circuits between coils due to static electricity-induced potential differences increases
Solution Approach 1:
The patent connects adjacent coils in the lamination direction through conductors to equalize their electric potentials. This equipotential connection prevents potential differences between coils that would otherwise arise from static electricity during mounting, thereby eliminating the risk of short circuits while maintaining the high current capability provided by multiple coils
Solution Approach 2:
The patent introduces conductors as intermediary elements between adjacent coils. These conductors serve as mediators that provide a controlled electrical connection path, allowing the coils to share the same potential without direct exposure to static electricity-induced potential differences that would cause short circuits
2Ease of operation
If external electrodes are disposed on the bottom surface for simplified mounting, then the ease of operation is improved, but the insulation resistance between coils may be compromised due to potential differences
Solution Approach 1:
The patent maintains the bottom surface electrode configuration for ease of mounting while adding internal conductors that connect adjacent coils. This ensures that even though electrodes are accessible on the bottom surface, the coils themselves remain at equal potential through the internal conductor connections, preserving insulation resistance
3Ease of operation
If coils are positioned closer to the bottom surface for electrode accessibility, then the ease of operation is improved, but the insulation between coils becomes more vulnerable to potential difference effects
Solution Approach 1:
The patent allows coils to be positioned for optimal electrode accessibility on the bottom surface while introducing conductors that connect adjacent coils in the lamination direction. This equipotential connection eliminates the harmful effect of potential differences, making the coil positioning immune to the vulnerability that would otherwise exist
Data Source
AI summary
A multilayer coil and a multilayer coil array, each including a body in which a magnetic layer is laminated, a first coil including a plurality of first coil conductor layers in a lamination direction, and a second coil including a plurality of second coil conductor layers in the lamination direction. The first and second coils are inside the body, first and second external electrodes are electrically connected to the first coil, and third and fourth external electrodes are electrically connected to the second coil. The first to fourth external electrodes are on a bottom surface of the body, the second coil is at a position farther from the bottom surface of the body than the first coil is in the lamination direction, and the multilayer coil includes a first extended conductor inside the body and connecting an end of a first coil conductor layer closest to the bottom surface.