Semiconductor Module Conductor Segmentation for Magnetic Field Reduction
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Solution Overview
Problem
Conventional semiconductor devices do not effectively restrict the generation of radiation magnetic fields caused by high-frequency currents during switching operations, leading to potential magnetic coupling and malfunctions between electronic components.
Innovation Solution
A semiconductor module design featuring a specific configuration of high-potential and low-potential side switching elements, conductors, and connection conductors, with a molded member to integrate and cover the components, reducing the current pathway length and loop area of high-frequency currents, thereby minimizing radiation magnetic field generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional semiconductor devices are used with standard conductor configurations, then the device structure is simple and easy to manufacture, but radiation magnetic fields are generated by high frequency currents during switching operations
Solution Approach 1:
The high-potential side conductor is divided into a wide section and a narrow section. The wide section provides a large mounting area for the switching element, while the narrow section reduces the loop area for high-frequency currents. This segmentation allows the conductor to serve multiple functions simultaneously.
Solution Approach 2:
Different sections of the high-potential side conductor have different widths to optimize different functions. The wide section is optimized for mounting the switching element with adequate clearance, while the narrow section is optimized for minimizing radiation magnetic fields. This local variation in geometry allows simultaneous satisfaction of electrical and electromagnetic compatibility requirements.
2Object-affected harmful factors
If the current pathway is shortened to reduce radiation magnetic fields, then radiation magnetic field generation is restricted, but the mounting area for switching elements may be reduced
Solution Approach 1:
The conductor is segmented into wide and narrow sections, allowing the wide section to provide adequate mounting area while the narrow section shortens the effective current pathway for reducing radiation magnetic fields.
Solution Approach 2:
The conductor width varies in one dimension (transverse direction) while maintaining extension in another dimension (longitudinal direction). This dimensional variation allows the mounting area to be sufficient in the transverse direction while the current pathway is shortened in the longitudinal direction.
Data Source
AI summary
In a semiconductor module, a high-potential side conductor includes a wide section on which the high-potential side switching element is mounted, a high-potential side terminal coupled with a high potential source, and a narrow section extending from the wide section to the high-potential side terminal in a first direction. The wide section is wider than the narrow section in a second direction perpendicular to the first direction. The wide section has a first side and a second side opposite to the first side in the second direction. A distance between the first side of the wide section and a low-potential side conductor is shorter than a distance between the second side of the wide section and the low-potential side conductor. The narrow section extends from a portion of the wide section closer to the first side than the second side.