Power Converter Negative Bus Bar Segmentation for Lower Loss
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Solution Overview
Problem
In electric power conversion devices, the longer line length of the bus bar on the primary side compared to the secondary side leads to increased losses due to the flow of a larger current, which is not efficiently managed by existing configurations.
Innovation Solution
The implementation of separate conductive members, including a first conductive member connected to the primary side negative electrode terminal, a second conductive member connected to the switching element, and a third conductive member connected to the secondary side negative electrode terminal, where the second and third members are formed as separate bodies with smaller cross-sectional areas and intersect on different planes, reducing the line length and facilitating cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the negative electrode bus bar is formed as a branched structure connecting primary side and secondary side terminals, then the electrical connection is established, but the line length of the primary side bus bar becomes longer causing increased loss
Solution Approach 1:
The patent divides the negative electrode bus bar into separate conductive members (first conductive member for primary side, second conductive member for secondary side) that are connected at different locations. This segmentation allows the primary side conductive member to have a shorter line length while still establishing the necessary electrical connections, thereby reducing energy loss in the high-current path.
Solution Approach 2:
The patent utilizes spatial arrangement by having the first and second conductive members intersect on different planes. This dimensional approach allows optimization of the primary side line length without compromising the secondary side connections, effectively separating the optimization of different current paths in three-dimensional space.
2Loss of energy
If the first conductive member is formed as a separate body from the second and third conductive members, then the line length is shortened reducing loss, but the device complexity increases
Solution Approach 1:
The conductive members are segmented into separate bodies (first conductive member, second conductive member, third conductive member) that can be independently optimized. While this increases component count, each segment can be simplified in design and fabrication, potentially offsetting the complexity through modular manufacturing approaches.
Data Source
AI summary
An electric power conversion device of an embodiment includes: a primary side negative electrode terminal; a secondary side negative electrode terminal; a negative electrode terminal of a switching element connected between the primary side negative electrode terminal and the secondary side negative electrode terminal; a first conductive member connected to the primary side negative electrode terminal; a second conductive member connected to the negative electrode terminal of the switching element; and a third conductive member connected to the secondary side negative electrode terminal, wherein the first conductive member, the second conductive member, and the third conductive member are connected to one another, and the first conductive member is formed as a separate body separately from the second conductive member and the third conductive member.