Power Electronic Transformer With Series-Input LLC Module Architecture
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Solution Overview
Problem
Conventional power electronic transformers require a large number of power conversion modules due to limited rated voltages of switching semiconductor components, leading to complex designs, increased space, and costs.
Innovation Solution
The power electronic transformer incorporates a DC/DC circuit with multiple LLC resonant DC/DC units, where input ends of the units are connected in series and output ends in parallel, increasing the voltage handling capability of each power conversion module and reducing the overall number of modules needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional power electronic transformers use switching semiconductor components with limited rated voltages, then the voltage handling capability of each module is constrained, but the number of power conversion modules increases leading to complex design and increased space
Solution Approach 1:
The patent divides the DC/DC circuit into multiple LLC resonant DC/DC units connected in series at the input end. Each unit handles a portion of the total voltage, allowing the system to achieve high voltage handling capability without requiring a single high-voltage module. This segmentation enables modular design while maintaining manageable complexity in each individual unit.
Solution Approach 2:
The patent combines multiple LLC resonant DC/DC units within a single power conversion module. By merging these units and connecting their input ends in series and output ends in parallel, the module achieves both high voltage handling capability and improved current output quality, reducing the total number of separate modules needed in the system.
2Power
If multiple power conversion modules are used to handle high voltage, then voltage transformation is achieved, but occupied space and costs increase
Solution Approach 1:
The patent merges multiple LLC resonant DC/DC units into a single integrated power conversion module. By combining these units with series-connected input ends and parallel-connected output ends, the design achieves high voltage transformation capability while minimizing the number of discrete modules, thereby reducing occupied space and associated costs.
3Power
If a large number of power conversion modules are deployed, then voltage transformation is achieved, but matching circuit boards and overall design complexity increase
Solution Approach 1:
The patent integrates multiple LLC resonant DC/DC units within a single power conversion module, reducing the total number of modules required for voltage transformation. This integration directly reduces the number of matching circuit boards needed and simplifies the overall system design and assembly processes.
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 reduces the number of power conversion modules, simplifying the design, minimizing occupied space, and lowering costs while maintaining efficient voltage transformation and current output quality.
Implementation Method 1
Each DC/DC circuit includes n LLC resonant DC/DC units
Data Source
AI summary
This application discloses a power electronic transformer wherein each phase includes a plurality of power conversion modules. Each power conversion module includes a rectifier AC/DC circuit, a direct current bus capacitor, and a direct current-direct current DC/DC circuit. In each power conversion module, an output end of the AC/DC circuit is connected to an input end of the DC/DC circuit; the direct current bus capacitor is connected in parallel to the output end of the AC/DC circuit; and input ends of all the AC/DC circuits are connected in series, and output ends of all the DC/DC circuits are connected in parallel. The power electronic transformer includes a relatively small quantity of power conversion modules, thereby reducing occupied space and costs.