Semiconductor Power Module Terminal Layout for Mutual Inductance Reduction
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Solution Overview
Problem
Semiconductor power modules face challenges with surge voltage generation during switching operations, primarily due to inductance components in the current path, which are exacerbated by the arrangement of power supply terminals in existing designs.
Innovation Solution
The semiconductor power module incorporates an insulating substrate with the first and second power supply terminals facing each other across the substrate, allowing for a controlled distance between them based on the substrate's thickness, thereby reducing mutual inductance and surge voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If power supply terminals are arranged at one end portion of the resin case, then the structure is simple and easy to manufacture, but the distance between terminals becomes large causing increased mutual inductance and surge voltage
Solution Approach 1:
The patent transitions from arranging terminals at the same end portion (2D planar arrangement) to arranging them at opposite end portions across the resin case (3D spatial arrangement utilizing thickness dimension). This dimensional change reduces the distance between terminals while maintaining manufacturing simplicity, thereby reducing mutual inductance and surge voltage generation.
2Object-affected harmful factors
If power supply terminals are arranged close to each other, then mutual inductance is reduced, but insulation difficulty increases
Solution Approach 1:
The patent utilizes the thickness dimension of the resin case to arrange power supply terminals at opposite ends, achieving close proximity in 3D space while maintaining adequate insulation distance through the insulating substrate. This resolves the conflict between reducing mutual inductance and maintaining insulation performance.
3Reliability
If the distance between power supply terminals is large, then insulation is easier to maintain, but inductance component increases causing higher surge voltage
Solution Approach 1:
By arranging terminals at opposite end portions across the resin case thickness, the patent achieves short terminal distance (reducing inductance) while maintaining adequate insulation through the insulating substrate positioned between them. This 3D arrangement simultaneously optimizes both inductance reduction and insulation maintenance.
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
This configuration effectively reduces the inductance component between the power supply terminals, minimizing surge voltage and enhancing the performance of the semiconductor power module.
Implementation Method 1
A magnetic field generated at one power supply terminal and a magnetic field generated at the other power supply terminal therefore cannot be canceled out satisfactorily
Data Source
AI summary
A semiconductor power module including an insulating substrate having one surface and another surface, an output side terminal arranged at a one surface side of the insulating substrate, a first power supply terminal arranged at the one surface side of the insulating substrate, a second power supply terminal to which a voltage of a magnitude different from a voltage applied to the first power supply terminal is to be applied, and arranged at an other surface side of the insulating substrate so as to face the first power supply terminal across the insulating substrate, a first switching device arranged at the one surface side of the insulating substrate and electrically connected to the output side terminal and the first power supply terminal, and a second switching device arranged at the one surface side of the insulating substrate and electrically connected to the output side terminal and the second power supply terminal.