Integrated Magnetic Elements for Parallel Resonant Converters
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Solution Overview
Problem
In high power supply applications, parallel-connected converters with multiple magnetic elements result in increased volume, weight, and loss due to non-uniform electrical parameters leading to uneven power distribution and potential overheating or voltage/current stress.
Innovation Solution
Integration of inductors and transformers into a single magnetic element with shared central columns of the same cross-sectional area, allowing for reduced volume and weight while maintaining uniform electrical parameters across branches, facilitating efficient power distribution and simplified control circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple magnetic elements are used in parallel-connected converters to achieve high power, then power output is improved, but volume and weight of magnetic elements increase
Solution Approach 1:
The patent combines multiple magnetic elements (inductors and transformers) into a single integrated magnetic element. The first and second inductors share a first magnetic element, while the first and second transformers share a second magnetic element. This merging approach maintains the required power output through parallel-connected converter branches while significantly reducing the overall weight and volume of magnetic elements compared to using separate magnetic elements for each branch.
2Power
If multiple magnetic elements are used in parallel-connected converters to achieve high power, then power output is improved, but the number of magnetic elements increases
Solution Approach 1:
The patent integrates multiple magnetic elements into shared magnetic cores. Specifically, the first inductor and second inductor are integrated in a first magnetic element, and the first transformer and second transformer are integrated in a second magnetic element. This reduces the total number of discrete magnetic elements while maintaining the parallel-connected converter structure needed for high power output.
3Power
If multiple magnetic elements are used in parallel-connected converters, then power output is improved, but non-uniform electrical parameters cause uneven power distribution and local overheating
Solution Approach 1:
The patent ensures uniform electrical parameters by designing the shared magnetic elements with symmetric structures. The first magnetic element contains a first central column and second central column with equal cross-sectional areas, and the second magnetic element contains a third central column and fourth central column with equal cross-sectional areas. This local quality control ensures that inductors and transformers in parallel branches have matched electrical characteristics, achieving uniform power distribution and preventing local overheating.
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 approach reduces the number and size of magnetic elements, enhances power density, optimizes current sharing, and improves efficiency by ensuring uniform resonant parameters and reduced inductance differences between branches.
Implementation Method 1
the first coil is positioned around the first central column to form the first inductor, the second coil is positioned around the second central column to form the second inductor
Implementation Method 2
the first transformer includes a first primary coil and a first secondary coil positioned on the first central column, and the second transformer includes a second primary coil and a second secondary coil positioned on the second central column
Implementation Method 3
the first inductor, the first transformer and the first capacitor are connected in series to form a first resonant unit
Data Source
AI summary
A multiple parallel-connected resonant converter, an inductor-integrated magnetic element and a transformer-integrated magnetic element are provided. The multiple parallel-connected resonant converter includes a first and a second converters. The first converter having a first input and output end includes a first inductor, a first transformer and a first capacitor connected in series. The second converter having a second input and output end includes a second inductor, a second transformer and a second capacitor connected in series. The second output end is connected with the first output end in parallel. The first and second inductor are integrated in a first magnetic element, the first magnetic element includes a first and second side column, and a first and second central column. The first inductor includes a first coil positioned around the first central column and the second inductor includes a second coil positioned around the second central column.