Potted IC Device with Aluminum Case for Thermal Dissipation
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Solution Overview
Problem
Integrated circuit devices, such as rectifiers, face inefficiencies due to inadequate cooling during operation, particularly because the thermal conductivity of their packaging is insufficient, leading to unsatisfactory thermal dissipation.
Innovation Solution
The integration of an electrically-conductive housing with a copper die pad and potting material, which forms a thermal conduction path to effectively dissipate heat from semiconductor dies, and an optional structure extending from the housing for enhanced heat removal, allowing for both surface- and through-hole-mountable applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional packaging materials are used, then electrical insulation is provided, but thermal dissipation is insufficient
Solution Approach 1:
The packaging is segmented into distinct functional layers: an electrically insulating potting material surrounding the semiconductor die, and an electrically conductive housing providing thermal dissipation. This segmentation allows each material to perform its primary function without compromise.
Solution Approach 2:
The potting material acts as an intermediary between the semiconductor die and the conductive housing, providing electrical insulation while allowing thermal conduction paths to extend from the die through the housing for heat dissipation.
2Temperature
If thermal conductivity is improved by using conductive materials, then heat dissipation increases, but electrical isolation requirements become more complex
Solution Approach 1:
Different regions of the packaging have different electrical properties: the potting material region provides electrical insulation, while the housing region provides thermal conduction. This local differentiation of material properties resolves the contradiction between heat dissipation and electrical isolation.
Solution Approach 2:
The packaging uses a composite structure combining electrically insulating potting material with an electrically conductive housing, allowing simultaneous achievement of electrical isolation and thermal dissipation functions.
3Temperature
If packaging design is modified to improve cooling, then thermal dissipation improves, but manufacturing complexity increases
Solution Approach 1:
The conductive housing serves multiple functions simultaneously: it provides structural containment, electrical shielding, and thermal dissipation pathways. This multi-functionality improves cooling efficiency without proportionally increasing manufacturing complexity.
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 solution provides improved thermal dissipation capabilities, enabling integrated circuit devices to operate at more desirable temperatures without significant changes in packaging or additional isolation requirements, and allows for direct mounting to heat sinks for enhanced cooling.
Implementation Method 1
heat is removable from the die via a thermal conduction path formed by the electrically-conductive structure, the potting material, and the electrically-conductive housing
Data Source
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AI summary
An integrated circuit device includes a die, a lead, and an electrically-conductive structure that is arranged to facilitate electrical communication between the die and the lead. The device also includes a potting material, in which the electrically conductive structure, the die, and at least part of the lead are embedded. An electrically-conductive housing encases the potting material and forms exterior packaging of the device. During manufacturing, the electrically-conductive structure, the die, and at least part of the lead may be arranged within the electrically-conductive housing either before or after the potting material is disposed in the housing. When the integrated circuit device is operating, heat is removable from the die via a thermal conduction path formed by the electrically-conductive structure, the potting material, and the electrically-conductive housing.