Two-Winding Transformer Circuit for Three-Phase Resonant DC-DC Converters
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Solution Overview
Problem
Conventional three-phase resonant DC-DC converters face challenges with galvanic isolation, high cost, and increased volume and weight due to the use of three-winding transformers, which hinder efficiency and reliability improvements.
Innovation Solution
A two-winding high-frequency transformer circuit is introduced for a three-phase resonant converter, simplifying the layout and reducing the number of transformer windings, thereby lowering volume, weight, and cost while maintaining high efficiency and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three-winding transformers are used for galvanic isolation in three-phase resonant converters, then isolation performance is improved, but device complexity, volume, weight, and cost increase
Solution Approach 1:
The patent divides the three-phase power transmission function into three separate single-phase transformer circuits, each handling one phase independently. This segmentation allows each transformer to use simpler two-winding configurations while collectively achieving three-phase galvanic isolation, reducing overall complexity compared to a single three-winding transformer.
Solution Approach 2:
The patent combines three separate single-phase transformer circuits into a unified three-phase resonant converter system. By merging these simplified individual circuits that each provide galvanic isolation, the system achieves both isolation performance and reduced complexity through modular design.
2Reliability
If three-winding transformers are used for galvanic isolation, then isolation performance is improved, but volume and weight increase
Solution Approach 1:
The patent segments the transformer system into three independent single-phase units, each with compact two-winding structure. This segmentation eliminates the need for bulky three-winding transformers, significantly reducing total volume while maintaining galvanic isolation through the distributed architecture of multiple smaller transformer units.
3Reliability
If three-winding transformers are used for galvanic isolation, then isolation performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent segments the transformer design into standard single-phase two-winding units, which are simpler and less expensive to manufacture than custom three-winding transformers. This segmentation allows use of conventional manufacturing processes and standard components, reducing overall cost while achieving the required galvanic isolation through the three-phase configuration.
4Productivity
If conventional three-phase resonant converter topology is used, then power conversion function is achieved, but efficiency is reduced due to higher losses
Solution Approach 1:
The patent segments the power conversion into three separate resonant circuits, each with its own transformer. This segmentation enables independent optimization of each phase's resonant operation, improving overall efficiency by reducing transformer losses through better magnetic coupling and reduced leakage inductance in the two-winding configurations.
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 two-winding transformer configuration enhances efficiency, reliability, and reduces costs by simplifying the converter layout, achieving better performance and reduced component requirements.
Implementation Method 1
the transformer circuit comprising: a first transformer and a second transformer... the transformer circuit is a two-winding high frequency transformer circuit
Implementation Method 2
resonant DC to DC converters... resonant tank circuit... soft switching of the semiconductor switches, which lead to high efficiency
Data Source
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AI summary
A transformer circuit includes a first transformer (T1) and a second transformer (T2), a first terminal of the first transformer connected to a first terminal of the second transformer and an inductor (L1) connected between a second terminal of the first transformer and a second terminal of the second transformer.