Power Component Spring Clamping With Guided Deformation Control
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Solution Overview
Problem
Current methods of fastening and heat dissipation for power components, such as IGBTs or MOSFETs, face challenges in controlling the deformation of spring sheets during assembly, leading to yield risks and potential damage to the components due to excessive force or improper mounting.
Innovation Solution
A power device design incorporating a guide support and spring sheet configuration that controls the deformation of the spring sheet during assembly, using a guide support with angled surfaces to precisely guide the spring sheet into position, avoiding yield deformation and excessive force application on the power component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If spring sheet clamping is used instead of screw fastening, then production compliance problems are resolved and assembly is simplified, but the spring sheet undergoes excessive elastic deformation during assembly, causing yield risk
Solution Approach 1:
The guide support acts as an intermediary component between the spring sheet and the power component. It provides a controlled path for the spring sheet to deform and apply force, mediating the interaction to prevent excessive deformation while maintaining the simplicity of spring sheet clamping.
Solution Approach 2:
The guide support changes the deformation parameters of the spring sheet by providing geometric constraints through its angled outer side face. This controls the amount and direction of elastic deformation, ensuring it remains within safe limits while still achieving the required clamping force.
2Ease of operation
If external device applies large external force to make spring sheet elastically deform, then spring sheet moves to power component position, but large impact force is applied to power component when spring sheet is released, increasing damage probability
Solution Approach 1:
The guide support provides beforehand cushioning by providing a gradual deformation path for the spring sheet. The angled outer side face allows the spring sheet to deform progressively rather than suddenly, cushioning the impact force that would otherwise be applied to the power component when the spring sheet is released.
3Reliability
If elastic margin is added in advance during spring sheet design, then sufficient elastic force can be applied even when yield deformation occurs, but force applied by spring sheet free of yield deformation is excessively large, likely causing damage to power component
Solution Approach 1:
The guide support serves as an intermediary that controls the force transmission from the spring sheet to the power component. It ensures that the force remains within safe limits by providing geometric constraints, eliminating the need to add excessive elastic margin to the spring sheet design.
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 ensures stable clamping force and efficient heat dissipation while reducing the risk of component damage, simplifying assembly, and minimizing the need for additional elastic margins, thereby enhancing production efficiency and reducing costs.
Implementation Method 1
The spring sheet includes a pressing part. The pressing part is configured to elastically press against a second surface of the main body part
Data Source
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AI summary
This application provides a power device. The power device includes a spring sheet, a power component, a circuit board, a guide support, and a heat dissipation structure fastened between the circuit board and the guide support. The power component includes a main body part and a pin. The pin is configured to connect to the circuit board. A first surface of the main body part faces and is connected to the heat dissipation structure. The guide support and the pin are distributed on two opposite sides of the main body part in a first direction. The guide support includes an outer side face disposed at an included angle with the first direction. The spring sheet includes a pressing part. The pressing part is configured to elastically press against a second surface of the main body part. The outer side face is configured to guide the pressing part to the second surface of the main body part. The first surface and the second surface are disposed opposite to each other in a second direction. This application effectively resolves a problem of a yield risk that is likely to be caused by an excessively large amount of elastic deformation of a spring sheet in an assembly process, and better facilitates mounting of the spring sheet.