Circuit Assembly Substrate Leveling for Noise Reduction
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Solution Overview
Problem
Conventional circuit assemblies face challenges in manufacturing complexity due to level differences between conductor patterns on control circuit boards and exposed bus bars, which complicates the connection of semiconductor switching elements and hinders the efficient arrangement of additional elements like noise reduction or control elements.
Innovation Solution
The circuit assembly design includes a first substrate with a conductive path and a second substrate in the same layer as the bus bars, with a connection member to reduce level differences between terminal connections, allowing for simplified terminal mounting and the placement of control or noise reduction elements on the second substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the control circuit board has opening portions with bus bars exposed inside, then the bus bars can be connected to semiconductor switching elements, but level differences are formed between the conductor pattern on the surface and the exposed bus bars, requiring terminal bending that complicates the manufacturing process
Solution Approach 1:
The patent introduces a multi-layer substrate structure where conductor patterns are arranged on different layers (first layer and second layer) to eliminate level differences. The first conductor pattern is on the first substrate surface, while the second conductor pattern is on a second substrate that is overlaid on the first substrate, creating a stepped configuration that resolves the height mismatch between surface conductor patterns and exposed bus bars.
Solution Approach 2:
The patent introduces a connection member as an intermediary element that connects the first conductor pattern on the first substrate with the second conductor pattern on the second substrate. This connection member bridges the gap between different layers and enables electrical connection while maintaining level surfaces for terminal attachment.
2Adaptability or versatility
If the control circuit board uses a single layer structure, then the structure is simple, but additional elements like noise reduction elements or control elements cannot be efficiently arranged in the vicinity of semiconductor switching elements
Solution Approach 1:
The patent utilizes a multi-layer substrate architecture where the second substrate is overlaid on the first substrate, creating additional spatial dimensions for element placement. This layered structure provides multiple mounting surfaces and allows noise reduction elements, control elements, or other components to be positioned in close proximity to semiconductor switching elements on appropriate layers, enhancing functional integration.
Data Source
AI summary
A circuit assembly 1 includes a semiconductor switching element, a main substrate, a plurality of bus bars and a sub-substrate that are overlaid on the main substrate, and a jumper wire. The main substrate includes a first insulating substrate and a first conductive path. The sub-substrate includes a second insulating substrate and a second conductive path, and is overlaid on the main substrate and arranged in the same layer as the bus bars. The jumper wire connects the first conductive path with the second conductive path. A plurality of terminals of the semiconductor switching element include a drain terminal 42 and a source terminal that are connected to the bus bar and a gate terminal connected to the second conductive path. A noise reduction element is mounted on the sub-substrate.