Inverter Bus Bar and EMI Filter Layout for Compact Power Conversion
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Solution Overview
Problem
Existing inverters face issues with electromagnetic interference (EMI) that degrade performance and impose spatial constraints, leading to manufacturing inefficiencies and reduced applicability.
Innovation Solution
The inverter design includes a DC bus bar assembly with an EMI filtering and current sensing circuit board, an AC bus bar assembly with ferrite filters, and a partitioned housing to reduce EMI, enhancing compactness and manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power modules are used for DC to AC conversion, then conversion functionality is achieved, but electromagnetic interference (EMI) is generated that degrades performance
Solution Approach 1:
An EMI filter is introduced as an intermediary component between the power modules and other circuit boards (DC bus sub-assembly, gate drive circuit board). This filter acts as a mediator that allows power conversion functionality while blocking harmful EMI signals from affecting other components, thus resolving the contradiction between achieving conversion capability and preventing EMI degradation.
2Reliability
If traditional inverter design is used, then basic functionality is achieved, but space efficiency and manufacturing efficiency are reduced
Solution Approach 1:
The EMI filter is merged with the DC bus bar assembly structure, and the current sensor is integrated onto the same circuit board. This consolidation reduces the number of separate components and assembly steps, thereby improving manufacturing efficiency and reducing spatial constraints within the inverter housing while maintaining all required functionalities.
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 design effectively reduces EMI, increases inverter compactness, and improves manufacturing efficiency, thereby increasing applicability and performance.
Implementation Method 1
a ferrite EMI filter positioned in a polymer molding
Implementation Method 2
an EMI filtering capacitor on a circuit board
Data Source
AI summary
An inverter is provided herein. The inverter includes, in one example, a direct current (DC) bus bar assembly electrically connected to a capacitor and a current sensor and an electromagnetic interference (EMI) filtering capacitor on a circuit board. The inverter further includes a power module electrically coupled to the capacitor and an alternating current (AC) bus bar assembly, where the AC bus bar assembly includes multiple phase bus bars.