Multilayer AC Busbar Layout to Suppress Skin-Effect Heating
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Solution Overview
Problem
Existing power conversion systems experience local heat generation due to skin effect in alternating current busbars when high-frequency current is superimposed, which is not adequately addressed by existing technologies.
Innovation Solution
A power conversion apparatus with a multilayer alternating current busbar structure featuring insulating layers and conductive plates, where current flows through multiple paths to reduce skin effect and distribute heat evenly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional single-layer alternating current busbar is used, then the structure is simple, but skin effect causes local heat generation when high frequency current is superimposed
Solution Approach 1:
The alternating current busbar is divided into multiple layers (first alternating current busbar and second alternating current busbar) stacked in the thickness direction, with insulating layers positioned between them. This segmentation increases the effective conduction path area and distributes current flow, reducing skin effect and local heat generation while maintaining structural simplicity.
2Temperature
If the conduction path area is increased to reduce skin effect, then local heat generation is suppressed, but the busbar structure becomes more complex
Solution Approach 1:
The busbar structure transitions from a single-layer planar configuration to a multi-layer stacked configuration in the thickness direction. This dimensional change increases the effective conduction path area without significantly increasing the planar footprint, thereby reducing skin effect and local heat generation while maintaining compact overall dimensions.
3Reliability
If multiple busbar layers are stacked to increase conduction path, then skin effect influence is reduced, but manufacturing complexity increases
Solution Approach 1:
The alternating current busbar is divided into multiple independent layers (first and second alternating current busbars) that can be manufactured separately and then assembled by stacking. This segmentation allows each layer to be manufactured using conventional processes, and the final assembly involves simple stacking with insulating layers, thereby reducing overall manufacturing complexity while achieving skin effect mitigation.
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
The solution effectively suppresses local heat generation and improves current balance, enhancing the efficiency and longevity of power conversion devices.
Implementation Method 1
Since skin effect occurs, and heat is locally generated in a surface of an alternating current busbar as an output part
Data Source
AI summary
A power conversion apparatus converting direct electrical power to alternating electrical power includes a plurality of semiconductor modules and an alternating current busbar connected in common to output terminals of the plurality of semiconductor modules, wherein the alternating current busbar has a multilayer structure divided into a plurality of pieces in a thickness direction, and includes an insulating layer partially provided between an upper plate on an upper side and a lower plate on a lower side.