Power Semiconductor Shielding Housing for Compact Insulating Fluid Tanks
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Solution Overview
Problem
Existing solutions for shielding performance haulers in boilers filled with insulating fluid are inefficient, leading to increased boiler size and cost due to the need for large distances between components to avoid high electrical field strengths.
Innovation Solution
A device featuring an electrode housing with conductive electrode walls that completely encapsulates the electrode interior, surrounded by a barrier arrangement made of non-conductive material, which allows the insulating fluid to penetrate and provides necessary insulation and cooling while minimizing field strengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If large distances are maintained between power semiconductor and surrounding components, then high electric field strengths are avoided, but the boiler becomes space-consuming and expensive
Solution Approach 1:
An intermediate shielding electrode is introduced between the power semiconductor and surrounding components. This electrode acts as a mediator that shapes the electric field lines, preventing direct field concentration at sharp edges while allowing the boiler dimensions to be reduced. The shielding electrode creates a controlled electric field distribution that protects the power semiconductor without requiring large clearance distances.
2Reliability
If shielding electrodes are used to prevent voltage spikes, then power semiconductor is protected, but the device complexity increases
Solution Approach 1:
The shielding electrode's position and shape parameters are optimized to achieve effective shielding with minimal structural complexity. By carefully selecting the electrode's geometric parameters and spatial arrangement, the patent achieves reliable protection from voltage spikes while keeping the overall device structure simple and manageable.
3Object-affected harmful factors
If component design avoids sharp edges, then high electric field strengths are reduced, but manufacturing complexity increases and protection is insufficient for commercially available components
Solution Approach 1:
The shielding electrode serves as an intermediary that compensates for the unavoidable sharp edges on commercially available power semiconductors. Instead of requiring modification of the power semiconductor components themselves (which would increase manufacturing complexity), the shielding electrode externally neutralizes the harmful field concentration effects, maintaining both ease of manufacture and electrical performance.
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 solution enables a compact boiler design by reducing the need for large distances between components, thus lowering costs and weight while effectively shielding performance haulers from high voltage peaks.
Implementation Method 1
A power semiconductor arranged in the electrode housing is therefore located, at least when an alternating voltage is applied, in a so-called Faraday cage, i.e., in a field-free space. This prevents voltage spikes at the corners or edges of the power semiconductor switch, including its electronics.
Implementation Method 2
The insulating fluid of the tank can penetrate through the barrier arrangement and the electrode wall into the electrode interior, where it provides the necessary dielectric strength and cooling for the power semiconductors.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a device (3) for shielding a power semiconductor (1) in a tank filled with an insulating fluid. The aim of the invention is to prevent high field strengths at corners and edges of the power semiconductor (1). This aim is achieved, according to the invention, in that the device (3) comprises an electrode housing (4), which has electrically conductive electrode walls (5) that encapsulate an electrode interior chamber (6) that is designed for receiving the power semiconductor (1) in a delimiting manner on all sides, and a barrier arrangement (13), which comprises at least one barrier (14) made of a non-conductive material, the barrier arrangement (13) enclosing the electrode housing (4) on all sides.