Parallel Electrode Power Module Stray Inductance Reduction
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Solution Overview
Problem
Existing power electronic power modules and power module groups have high stray inductance due to electrode design, leading to increased voltage overshoot and losses, particularly at high switching frequencies, limiting their application in energy-efficient and low-carbon technologies.
Innovation Solution
A parallel electrode combination where the connecting portions of the first and second power module electrodes are opposite in parallel, with varying lengths and embedded nut or bolt heads, reducing stray inductance by optimizing current paths and heat dissipation structures within the power module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional electrode design is used in power modules, then the structure is simple and easy to manufacture, but the stray inductance is large causing voltage overshoot and increased loss
Solution Approach 1:
The electrode structure is divided into multiple segments including connecting portions, soldering portions, and embedded nut/bolt head portions. This segmentation allows optimization of current paths by creating parallel current flow routes through the divided electrode structure, thereby reducing stray inductance while maintaining manufacturability through modular assembly
Solution Approach 2:
Nuts or bolt heads are embedded within the electrode body during the molding process. This nesting approach integrates fastening functions directly into the electrode structure, eliminating the need for separate fastening components and reducing the overall current path length, thus reducing stray inductance without significantly increasing manufacturing complexity
2Object-affected harmful factors
If traditional electrode design is used, then the manufacturing process is simple, but the voltage overshoot is large due to high stray inductance
Solution Approach 1:
The electrode design changes geometric parameters including the arrangement of connecting portions, soldering portions, and embedded fasteners. These parameter changes create multiple parallel current paths and optimize current distribution, reducing voltage overshoot. The manufacturing process adapts by incorporating these geometric changes into existing molding and assembly operations, maintaining ease of manufacture
3Productivity
If conventional electrode arrangement is used, then the structure is straightforward, but the switching frequency application is limited due to increased loss
Solution Approach 1:
The electrode structure utilizes three-dimensional spatial arrangement with connecting portions extending in multiple directions and embedded fasteners positioned at optimal locations. This dimensional optimization creates shorter and more efficient current paths, reducing resistive losses and enabling higher switching frequency operation without excessive power loss
Data Source
AI summary
The invention discloses a parallel electrode combination, which includes a first power module electrode and a second power module electrode, wherein a soldering portion of the first power module electrode and a soldering portion of the second power module electrode are respectively used to connect a copper layer of a power source inside a power module, and a connecting portion of the first power module electrode and a connecting portion of the second power module electrode are opposite in parallel. The invention further discloses a power module and a power module group using the parallel electrode combination. In the invention, the connecting portion of the first power module electrode and the connecting portion of the second power module electrode are opposite in parallel.