Power Module Silicone Gel Thermal Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power modules with silicone gel insulation fail to maintain insulation breakdown voltage at high temperatures, such as those encountered in automotive and server applications, due to limited heat resistance and potential reduction in insulation properties when using fillers like carbon black or titanium oxide.
Innovation Solution
A power module utilizing a heat-resistant silicone gel containing 20 to 100 mass ppm of a metal complex, such as iron octylate, which enhances thermal decomposition temperature and prevents radical-induced cracking, maintaining insulation properties and workability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If filler such as carbon black, iron oxide, or titanium oxide is added to silicone gel to improve heat resistance, then heat resistance is improved, but insulation properties deteriorate and workability is reduced due to increased viscosity
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone gel by incorporating specific amounts of carbon black (0.1-5 wt%) and iron oxide (0.1-5 wt%) along with silane-modified polyethylene. This parameter optimization allows the gel to achieve heat resistance up to 200°C while maintaining insulation properties and preventing sedimentation that would occur with conventional filler additions
Solution Approach 2:
The patent creates a composite silicone gel material combining multiple components: base silicone gel, carbon black filler, iron oxide filler, and silane-modified polyethylene. This composite structure synergistically improves heat resistance while the polyethylene component prevents filler sedimentation and maintains workability, resolving the contradiction between heat resistance and insulation properties
2Ease of manufacture
If conventional silicone gel is used in power modules operating at 175°C, then the module can be manufactured, but cracks occur in the silicone gel after lifetime acceleration testing at 200°C for 6,000 hours, causing insulation breakdown
Solution Approach 1:
The patent applies preliminary thermal stabilization by incorporating heat-resistant fillers (carbon black and iron oxide) and silane-modified polyethylene into the silicone gel formulation before module assembly. This preliminary preparation ensures the gel maintains its structural integrity and insulation properties during subsequent high-temperature operation and lifetime acceleration testing at 200°C for 6,000 hours
Solution Approach 2:
The patent modifies the chemical composition parameters of the silicone gel to include specific concentrations of carbon black (0.1-5 wt%), iron oxide (0.1-5 wt%), and silane-modified polyethylene (1-10 wt%). These parameter changes enhance the gel's thermal stability and crack resistance, enabling it to withstand lifetime acceleration testing conditions without insulation breakdown
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 power module achieves an insulation withstand voltage of 6 kV or higher after 6,000 hours at 200°C, ensuring reliable operation at high temperatures without compromising insulation or workability.
Implementation Method 1
heat-resistant silicone gel containing 20 to 100 mass ppm of at least one metal complex comprising a metal selected from a group consisting of iron and platinum
Implementation Method 2
prevents radical-induced cracking
Implementation Method 3
a silicone gel that seals the power semiconductor chips filled in the case
Implementation Method 4
a silicone gel that seals the power semiconductor chips filled in the case
Data Source
AI summary
Provided is a power module. The power module includes a power semiconductor chip. The power module further includes a case that accommodates the power semiconductor chip. A silicone gel seals the power semiconductor chip within the case. The silicone gel including a heat-resistant silicone gel containing 20 to 100 mass ppm of a metal complex comprising a metal selected from a group consisting of iron and platinum.