Power Module Control Path Layout for Inductance Matching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Variations in inductance values between control electrodes of power semiconductor elements in a power module lead to unstable operation when high currents are supplied, affecting the timing of activating and deactivating the elements.
Innovation Solution
The power module includes an electrically insulative substrate with multiple control and drive layers, connection members, and power semiconductor elements arranged in specific directions, featuring detour portions in at least one control layer to minimize differences in conductive path lengths, ensuring synchronized activation and deactivation of elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power semiconductor elements are arranged in parallel to supply high current, then current capacity is improved, but inductance variations between control electrodes increase causing unstable operation
Solution Approach 1:
The patent introduces a multi-layer substrate structure with control layers arranged at different heights (dimensions). The first control layer is positioned at a first height from the lower surface, and the second control layer is positioned at a second height, creating a three-dimensional arrangement that reduces inductance variations while maintaining high current capacity through parallel element configuration.
Solution Approach 2:
The control layers are segmented into multiple groups (first control layer and second control layer) with different numbers of control electrodes. The first control layer has a first number of control electrodes, while the second control layer has a second number of control electrodes, allowing independent optimization of control paths for different power semiconductor element groups.
2Reliability
If control layers are positioned at different heights to reduce inductance variations, then operation stability is improved, but device complexity increases
Solution Approach 1:
The substrate structure serves multiple functions: it provides mechanical support, electrical insulation, and precise positioning for control electrodes at different heights. The insulating substrate simultaneously acts as a structural foundation and an electrical isolation medium, reducing the need for additional components and simplifying the overall device architecture despite the multi-layer configuration.
3Reliability
If multiple control layers with different numbers of control electrodes are used, then inductance matching is improved, but manufacturing precision requirements increase
Solution Approach 1:
The control electrodes in different control layers are positioned to achieve equipotential distribution across the power semiconductor elements. By arranging control electrodes at different heights with appropriate spacing, the patent creates equivalent electrical potential conditions that minimize inductance variations, ensuring uniform current distribution and synchronized switching across all parallel-connected power semiconductor elements.
Data Source
AI summary
A power module includes a first end power semiconductor element and a second end power semiconductor element. A first sum is a sum of a path length between the gate electrode of the first end power semiconductor element and a first control terminal and a path length between the source electrode of the first end power semiconductor element and a first detection terminal. A second sum is a sum of a path length between the gate electrode of the second end power semiconductor element and the first control terminal and a path length between the source electrode of the second end power semiconductor element and the first detection terminal. The power module includes a first control layer connected to the gate electrode. The first control layer includes a first detour portion that detours the path to reduce a difference between the first sum and the second sum.