Power Converter Bus Bar Layout for Low Parasitic Inductance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power conversion devices face challenges in efficiently arranging bus bars due to increased thickness, leading to longer connections and higher parasitic inductance, making it difficult to improve layout and electrical energy efficiency.
Innovation Solution
The power conversion device configures the switching element and condenser on one surface side of the cooler, with conductive members on the opposite surface side, allowing for efficient arrangement and fixation, and coolant flow direction perpendicular to the element and condenser alignment to enhance cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the semiconductor module and condenser are disposed on both sides of the cooler in the thickness direction, then the device can be compact, but the bus bar connection length increases and parasitic inductance increases
Solution Approach 1:
The patent transitions from a three-dimensional stacked arrangement (semiconductor module and condenser on opposite sides of the cooler in the thickness direction) to a two-dimensional planar arrangement (both components on the same side of the cooler). This dimensional change allows the bus bar to connect components more directly without wrapping around the cooler, reducing connection length and parasitic inductance while maintaining compact overall device volume.
2Volume of stationary object
If the device thickness increases, then there is more space for component arrangement, but the bus bar layout efficiency decreases and parasitic inductance increases
Solution Approach 1:
The patent extracts the bus bar from the complex three-dimensional routing path that would be required if components were on opposite sides of the cooler, and repositions it in a simplified two-dimensional configuration where the bus bar can directly connect the semiconductor module and condenser on the same cooler side, eliminating the need for the bus bar to wrap around or pass through the cooler structure.
3Loss of energy
If the bus bar length is reduced, then parasitic inductance decreases, but component arrangement becomes more difficult
Solution Approach 1:
By changing from a 3D stacked layout to a 2D planar layout with all components on one cooler side, the patent enables shorter bus bar connections while maintaining straightforward component arrangement. The cooler serves as a common mounting platform that simplifies the spatial relationships between components, making assembly easier despite the reduced connection length.
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 prevents lengthening of connections, reduces parasitic inductance, and enhances layout efficiency while maintaining a compact device size, improving electrical energy efficiency and cooling effectiveness.
Implementation Method 1
a cooler configured to cool at least one of the switching element and the condenser
Data Source
AI summary
A power conversion device includes an element module, a condenser, a case, a cooler, a positive terminal and a negative terminal on a primary side, and a positive terminal and a negative terminal on a secondary side. The case accommodates the element module, the condenser, and the case. The element module and the condenser are disposed on a surface side of the cooler. The power conversion device includes a secondary side positive electrode bus bar and a secondary side negative electrode bus bar that are connected between the positive terminal and negative terminal on the secondary side and the condenser. The secondary side positive electrode bus bar and the secondary side negative electrode bus bar are arranged on the surface side of the cooler.