Power Converter Shield Layout for Surge Electric Field Relaxation
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Solution Overview
Problem
In existing AC-DC power conversion devices, high electric fields are enhanced by the third electric field relaxation shield, leading to potential discharge and damage.
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, sharing their 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 to relax electric field during surge voltage, then the electric field relaxation effect is improved, but the high electric field is further enhanced between the shields
Solution Approach 1:
The third electric field relaxation shield is segmented into a first shield portion and a second shield portion that are disposed at different positions along the periphery of the power conversion units. The first shield portion is disposed at a first position and the second shield portion is disposed at a second position, creating a non-uniform distribution that prevents high electric field enhancement while maintaining overall relaxation effectiveness during surge voltage conditions.
Solution Approach 2:
Different portions of the third electric field relaxation shield are disposed at different positions (first position and second position) along the periphery, creating local variations in shield placement. This local quality approach ensures that the shield provides electric field relaxation where needed while avoiding positions that would enhance high electric fields between shields.
2Reliability
If multiple electric field relaxation shields are disposed between power conversion units and ground, then electric field protection is improved, but potential difference between shields increases
Solution Approach 1:
The third electric field relaxation shield is divided into multiple shield portions (first shield portion and second shield portion) disposed at different positions. This segmentation reduces the potential difference between adjacent shield portions compared to having a single continuous shield, thereby maintaining electric field protection while reducing harmful potential differences.
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 discharge and damage by distributing the potential across the third shield, thereby enhancing the device's insulation and protection.
Implementation Method 1
the third electric field relaxation shield is disposed between the first electric field relaxation shield and a grounding object (ground) so as to relax an electric field generated when a surge voltage is applied
Data Source
AI summary
This power conversion device includes a plurality of power conversion units, a first electric field relaxation shield, a second electric field relaxation shield, and a third electric field relaxation shield. The first, the second and the third electric field relaxation shield include a first end, a second end and a third end, respectively. The first electric field relaxation shield and the second electric field relaxation shield surround the plurality of power conversion units when viewed from a direction in which the first electric field relaxation shield and the third electric field relaxation shield are overlapped each other. The third end is disposed at any position within a range from a position overlapping the first end to a position overlapping the second end when viewed from the direction in which the first electric field relaxation shield and the third electric field relaxation shield are overlapped each other.