Semiconductor Module Segmented Ground Lines Reduce Inductance
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Solution Overview
Problem
Conventional semiconductor modules with a common L-shaped ground line for three phases result in increased inductance, leading to higher switching noise from half bridges, necessitating additional filtering components like resistors and capacitors.
Innovation Solution
A semiconductor module design with separate and electrically isolated ground lines for each phase, reducing the area of the ground lines to minimize inductance and switching noise, while maintaining efficient power conversion to a three-phase motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common L-shaped ground line is used for three phases, then wiring resistance is reduced, but inductance increases and switching noise increases
Solution Approach 1:
The common ground line is segmented into three separate ground lines (first ground line, second ground line, third ground line), each dedicated to a specific phase. This segmentation eliminates the large loop area associated with a common ground line, thereby reducing inductance and switching noise while maintaining low wiring resistance through direct connections.
2Reliability
If a common ground line is used for three phases, then wiring resistance is reduced, but ground line area increases
Solution Approach 1:
The ground line system is divided into three separate, smaller ground lines instead of one large common ground line. Each ground line connects to its corresponding phase, reducing the total area occupied while maintaining effective grounding for all phases.
3Object-generated harmful factors
If separate ground lines are used for each phase, then inductance is reduced and switching noise is reduced, but device complexity increases
Solution Approach 1:
The ground line system is segmented into three separate lines, each dedicated to a specific phase. This segmentation reduces inductance and switching noise by eliminating large current loops, while the overall device complexity remains manageable through systematic arrangement and connection to the ceramic substrate.
Data Source
AI summary
A semiconductor module is configured to convert a direct current to a three-phase alternating current, and to supply the three-phase alternating current to a three-phase motor to drive the three-phase motor, wherein the first ground terminal GND1, the second ground terminal GND2, and the third ground terminal GND3 are arranged along the second side B2 to be separated from one another and electrically isolated from one another.