Circular Semiconductor Switch Arrangement for Uniform Thermal Distribution
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Solution Overview
Problem
The existing driver assemblies for synchronous motors face issues with non-uniform heating and aging of semiconductor switches, leading to reduced electrical load capacity and increased failure probabilities, which can affect electromagnetic compatibility and reliability, especially in safety-critical systems like electric power steering.
Innovation Solution
A driver assembly with semiconductor switches arranged in a circular configuration, where one switch is at the center and the others are evenly distributed around it, ensuring uniform heating and aging, along with a phase separator for improved controllability and fault tolerance, and a heat sink for efficient cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If semiconductor switches are arranged in a matrix or randomly to keep supply lines short and allow common heat sink cooling, then the electrical connection efficiency is improved, but the thermal distribution becomes non-uniform leading to different temperatures and reduced overall electrical load capacity
Solution Approach 1:
The patent applies circular arrangement of semiconductor switches instead of traditional matrix or random layouts. The switches are positioned on a circle with equal spacing, creating a symmetric thermal distribution pattern. This curved geometric arrangement ensures that all switches have equivalent thermal pathways to the heat sink, eliminating temperature differences while maintaining short supply line connections.
2Device complexity
If semiconductor switches are arranged in non-uniform patterns, then device complexity is reduced, but the aging rates become different increasing failure probabilities
Solution Approach 1:
The patent implements homogeneous thermal conditions by arranging all semiconductor switches in identical positions relative to the heat sink. Each switch is positioned on the circular path with equal spacing, ensuring that all switches experience the same thermal environment. This homogeneity in thermal exposure ensures uniform aging rates across all switches, preventing any single switch from degrading faster than others.
3Adaptability or versatility
If leads to semiconductor switches are of different lengths, then arrangement flexibility is improved, but electromagnetic compatibility and impedance are negatively affected
Solution Approach 1:
The circular arrangement with equal spacing creates equipotential conditions for all semiconductor switches. The symmetric geometry ensures that all leads have equal lengths and equivalent electrical characteristics. This eliminates impedance mismatches and reduces electromagnetic interference, as all switches operate under identical electrical conditions despite the flexible circular layout.
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 enhances the long-term reliability and stability of the driver assembly by ensuring uniform thermal loads and comparable electrical load capacities, improving controllability and fault tolerance, and maintaining a predetermined steering behavior even in faulty conditions.
Implementation Method 1
the semiconductor switches can heat up essentially uniformly during operation... Thermal loads on the semiconductor switches can essentially be the same
Data Source
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AI summary
The invention relates to a driver assembly, comprising a predetermined number of semiconductor switches, wherein one of the semiconductor switches is arranged within a circular line, and the remaining semiconductor switches are arranged on the circular line.