Electric Field Shield Layout for Surge-Resistant Power Conversion
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Solution Overview
Problem
Existing power conversion devices enhance high electric fields between electric field relaxation shields due to potential differences, which can lead to increased electric discharge and potential breakdown.
Innovation Solution
A power conversion device with a configuration that includes a first, second, and third electric field relaxation shield, where the third shield is positioned to overlap the first and second shields, with its end protruding towards the second shield, sharing potential and reducing the electric field gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a third electric field relaxation shield is disposed all over the periphery of the power conversion units, then the electric field is relaxed when surge voltage is applied, but the high electric field between the first and second shields is further enhanced
Solution Approach 1:
The third electric field relaxation shield is segmented into a first shield portion and a second shield portion that are electrically disconnected from each other. This segmentation prevents the formation of a continuous conductive path that would enhance the high electric field, while still providing electric field relaxation functionality during surge voltage conditions.
Solution Approach 2:
Different portions of the third shield are positioned at different locations relative to the first and second shields. The first shield portion is positioned to face the first shield, while the second shield portion is positioned to face the second shield, creating local electric field relaxation zones without creating a continuous high electric field path.
2Reliability
If multiple electric field relaxation shields are used to protect power conversion units, then protection against operating voltages is improved, but potential differences between shields generate high electric fields
Solution Approach 1:
The third shield is divided into electrically disconnected portions that independently interact with the first and second shields. This segmentation allows each portion to locally manage electric field relaxation without creating potential difference-driven high electric fields across the entire shield structure.
Solution Approach 2:
The third shield portions act as intermediary elements between the first/second shields and the power conversion units. They provide local electric field relaxation without establishing continuous potential gradients that would generate harmful high electric fields.
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 configuration prevents the enhancement of high electric fields, reducing the risk of electric discharge and ensuring stable operation by distributing potential across the shields.
Implementation Method 1
the third electric field relaxation shield is disposed between the grounding object and the first electric field relaxation shield so as to be overlapped with the first electric field relaxation shield... so as to relax an electric field generated when a surge voltage is applied
Data Source
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AI summary
This power conversion device (100) includes a plurality of power conversion units (1), a first electric field relaxation shield (51), a second electric field relaxation shield (52), and a third electric field relaxation shield (53). The first electric field relaxation shield (51) includes a first end (E1). The second electric field relaxation shield (52) includes a second end (E2). The third electric field relaxation shield (53) includes a third end (E3). The first electric field relaxation shield (51) and the second electric field relaxation shield (52) surround the plurality of power conversion units (1) when viewed from a direction in which the first electric field relaxation shield (51) and the third electric field relaxation shield (53) are overlapped each other. The third end (E3) is disposed at any position within a range from a position overlapping the first end (E1) to a position overlapping the second end (E2) when viewed from the direction in which the first electric field relaxation shield (51) and the third electric field relaxation shield (53) are overlapped each other.