Power Converter Bus Bar Loop Inductance Reduction
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Solution Overview
Problem
Existing power converter designs face challenges in reducing loop inductance between the power semiconductor module and the capacitor element while trying to shorten the single running section of the bus bars, which can limit the degree of freedom in selecting the positional relationship between these components.
Innovation Solution
The power converter incorporates a bus bar arrangement where the positive and negative electrode bus bars extend along the non-electrode surface of the capacitor element, gather with each other, and run parallel, allowing for the shortening of the single running section without increasing the loop inductance, by canceling out magnetic flux through opposing current directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the single running section of the bus bar is shortened by reducing the distance between the power semiconductor module and the capacitor element, then the loop inductance is reduced, but the degree of freedom in selecting the positional relationship between the power semiconductor module and the capacitor element is reduced
Solution Approach 1:
The bus bar configuration transitions from a single-plane arrangement to a three-dimensional spatial arrangement. The bus bar extends along the electrode surface of the capacitor element, then bends to run parallel to the power semiconductor module, creating a multi-dimensional current path that reduces loop inductance while preserving positioning flexibility
Solution Approach 2:
The bus bar is divided into multiple running sections: a first running section extending along the electrode surface, a second running section running parallel to the power semiconductor module, and connection sections. This segmentation allows each section to be optimized independently for inductance reduction while maintaining overall positioning freedom
2Adaptability or versatility
If the single running section of the bus bar is lengthened to increase positional freedom, then the degree of freedom in selecting the positional relationship is improved, but the loop inductance increases
Solution Approach 1:
By utilizing three-dimensional space, the bus bar creates parallel running sections that run adjacent to each other, effectively reducing the loop area without constraining the relative positions of the capacitor element and power semiconductor module
Solution Approach 2:
The bus bar configuration converts the potentially harmful long single running section into a beneficial parallel running structure, where the return path runs adjacent to the forward path, transforming the extended length into an inductance-reducing configuration
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 loop inductance and allows for shorter single running sections without restricting the positional freedom of the power semiconductor module and capacitor element, enhancing the efficiency of the power converter.
Implementation Method 1
The positive electrode bus bar and the negative electrode bus bar run side by side in a bus bar parallel running section... the positive electrode bus bar runs in parallel with the negative electrode bus bar in the bus bar parallel running section
Data Source
AI summary
Positive and negative power terminals protrude from a power terminal arrangement surface not facing a capacitor element. Positive and negative electrode bus bars gather with each other after at least one of them extends along a non-electrode surface of the capacitor element, and then run side by side in a bus bar parallel running section. The positive electrode bus bar runs in parallel with the negative electrode bus bar in the bus bar parallel running section, and then extends along the positive power terminal from the proximal end of the positive power terminal to the distal end thereof. The negative electrode bus bar runs in parallel with the positive electrode bus bar in the bus bar parallel running section, and then extends along the negative power terminal from the proximal end of the negative power terminal to the distal end thereof.