Stacked Power Module and Capacitor Layout for Short PN Loops
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Solution Overview
Problem
Existing power control apparatuses have a large PN current loop and long power bus bars due to the arrangement of semiconductor modules and capacitors, leading to increased inductance, which hinders performance.
Innovation Solution
The power control apparatus groups semiconductor modules into upper and lower arm modules arranged in parallel in the stacking direction, with capacitors positioned in the stacking direction and power bus bars extended to straddle heat exchange members, reducing the length of the current path and inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If semiconductor modules are arranged in parallel in the stacking direction with capacitors positioned in the stacking direction, then the PN current loop length is shortened, but the arrangement complexity increases
Solution Approach 1:
The patent transitions from a planar arrangement to a three-dimensional stacked configuration where semiconductor modules and capacitors are arranged in the stacking direction (vertical dimension). This dimensional change allows the PN current loop to be shortened by positioning components closer together in the vertical axis, while the modular stacked structure actually simplifies the overall arrangement logic compared to complex planar routing.
2Length of stationary object
If power bus bars are extended to straddle heat exchange members, then the power bus bar length is shortened, but the manufacturing complexity increases
Solution Approach 1:
The power bus bars are designed to perform multiple functions: they provide electrical connection between capacitors and semiconductor modules while simultaneously straddling the heat exchange members for thermal management. This multi-functional design integrates the electrical and thermal pathways into a unified structure, reducing the need for separate components and actually simplifying the overall manufacturing process despite the extended configuration.
3Reliability
If the current path length is reduced, then the inductance is reduced, but the structural complexity increases
Solution Approach 1:
The patent merges the electrical current path and thermal management pathways into an integrated three-dimensional structure. The power bus bars and semiconductor modules are positioned to create short current loops while simultaneously serving as thermal conduction paths to the heat exchange members. This consolidation reduces inductance by minimizing current loop area while the integrated structure avoids the need for separate complex routing systems.
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 shortens the PN current loop and power bus bar length, resulting in a reduced inductance and improved performance of the power control apparatus.
Implementation Method 1
a cooler having a plurality of heat exchange members which constitute a stacked unit together with the semiconductor modules and are arranged in multiple stages to cool each of the upper arm module and the lower arm module from both sides in the stacking direction
Data Source
AI summary
Semiconductor modules include upper arm modules and lower arm modules which are arranged in parallel with the upper arm modules in a stacking direction. Heat exchange members of a cooler is arranged in multiple stages and form a stacked unit together with the semiconductor modules so as to cool each of the upper arm modules and the lower arm modules from both sides in the stacking direction. A capacitor module is arranged on a side of one end of the stacked unit in the stacking direction. A power supply bus bar electrically connecting the capacitor module and the semiconductor module extends in the stacking direction so as to straddle at least one heat exchange member.