Segmented Insulating Transformer Layout to Prevent Resonance
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Solution Overview
Problem
Conventional power conversion devices with large and heavy insulating transformers face issues with assemblability and heat dissipation, leading to increased costs.
Innovation Solution
The use of multiple sub-insulating transformers electrically connected in series, where the excitation inductances of the windings have opposite polarities and are configured to prevent resonance phenomena, allowing for improved assemblability, heat dissipation, and cost reduction by dispersing heat sources and using general-purpose transformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If one large insulating transformer is used, then power conversion function is achieved, but assemblability deteriorates and heat dissipation becomes poor
Solution Approach 1:
The insulating transformer is divided into multiple sub-insulating transformers (first to Nth sub-insulating transformers) that are electrically connected in series. Each sub-insulating transformer has smaller size and weight, enabling substrate mounting and improving assemblability while dispersing heat sources for better heat dissipation.
2Temperature
If one large insulating transformer is used, then power conversion function is achieved, but heat dissipation deteriorates
Solution Approach 1:
The transformer is segmented into multiple sub-insulating transformers with smaller volumes. This segmentation disperses the heat sources across multiple smaller units, significantly improving heat dissipation performance while reducing volume concentration.
3Ease of manufacture
If multiple sub-insulating transformers are used, then assemblability and heat dissipation are improved, but device complexity increases
Solution Approach 1:
Multiple sub-insulating transformers are electrically connected in series to merge their functions into a single insulating transformer system. This merging approach maintains the benefits of multiple units (improved assemblability and heat dissipation) while presenting a unified functional structure that reduces overall system complexity.
4Reliability
If conventional insulating transformer configuration is used, then power conversion is achieved, but resonance phenomenon occurs between excitation inductances and interphase capacitance
Solution Approach 1:
The polarity directions of the windings are changed such that the excitation inductance of the first winding and the excitation inductance of the second winding become opposite polarities. This parameter change in winding configuration prevents resonance phenomenon between the excitation inductances and interphase capacitance, improving reliability.
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 prevents the concentration of volume and weight, enhances assemblability and heat dissipation, and reduces costs while preventing resonance phenomena, resulting in a high-performance power conversion device.
Implementation Method 1
Each of the first to Nth sub-insulating transformers includes first and second sub-windings... an excitation inductance of the first sub-winding and an excitation inductance of the second sub-winding become opposite polarities when a current flows from the first sub-terminal to the third sub-terminal through the first sub-winding, the interphase capacitance between the first and second sub-windings, and the second sub-winding
Data Source
AI summary
An insulating transformer includes a plurality of sub-insulating transformers connected in series. Polarity directions of all sub-windings are identical. When a current I flows from a first main terminal to a third main terminal through the first sub-winding, an interphase capacitance, and the second sub-winding, excitation inductance of the first sub-winding and excitation inductance of the second sub-winding are configured to have opposite polarities.