Modular Power Converter Topology for Multi-Load DC Output
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power converters require multiple stages of power electronics to convert alternating current from a high-voltage network to direct current for loads, leading to high energy consumption and costs due to the need for additional DC/DC converters to accommodate loads with different requirements.
Innovation Solution
The proposed power converter reduces the number of conversion stages by connecting n power modules in series and m power units in parallel for each phase of the alternating current power supply, allowing for simultaneous connection to loads with different requirements without an additional DC/DC converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional topology with cascaded H-bridge rectifier and multiple DC/DC stages is used, then the power converter can accommodate different voltage ranges and isolate floating voltage, but the number of power electronic stages increases leading to higher energy consumption and higher costs
Solution Approach 1:
The patent merges the functions of multiple separate power electronic stages (rectifier, DC/DC isolating circuit, and DC/DC converter) into a single integrated power module. Each power module contains an H-bridge circuit and a DC/DC converter circuit that work together to perform rectification, isolation, and voltage conversion in one unified structure, thereby reducing the total number of stages from four or more to just two (AC/DC conversion stage followed by DC output stage).
Solution Approach 2:
The power module is designed with multi-functionality to simultaneously perform multiple tasks: AC to DC conversion, electrical isolation of floating voltage, and voltage adaptation for different load ranges. By making each power module universal in its capabilities, the system eliminates the need for separate specialized circuits for each function, directly reducing the number of power electronic stages required.
2Adaptability or versatility
If multiple DC/DC converters are added to accommodate loads with different voltage requirements, then the adaptability to different loads improves, but the device complexity and cost increase
Solution Approach 1:
The patent implements dynamic adaptability by enabling each power module to independently adjust its output voltage within a wide range through its integrated DC/DC converter circuit. This dynamic capability allows the system to adapt to different load voltage requirements without adding fixed-stage converters, as each module can flexibly configure its output to match the specific load needs.
Solution Approach 2:
The system is segmented into multiple independent power modules, where each module can be independently controlled and configured. This segmentation allows different modules to serve different load requirements simultaneously, providing adaptability without requiring a single complex multi-stage converter system. Each module operates autonomously, simplifying the overall architecture.
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 energy consumption and costs by minimizing the number of power electronics stages, while also improving conversion efficiency and enabling simultaneous power supply to loads with varying requirements.
Implementation Method 1
m power units, where the m power units are connected in parallel to the alternating current input end, and are configured to convert an alternating current into a direct current
Implementation Method 2
the isolating circuit includes: an isolated DC/DC conversion circuit, where the isolated DC/DC conversion circuit is configured to convert a voltage and isolate a floating voltage
Data Source
AI summary
A power converter is provided. The power converter is configured to be connected between a multi-phase alternating current power supply derived from an alternating current power network and a load. For each phase of the alternating current power supply, the power converter includes n power modules, and each power module has: one alternating current input end; m power units connected in parallel to the alternating current input end; and m direct current output ends. Alternating current input ends of the n power modules are sequentially connected in series and are connected between a corresponding phase and a common node. Direct current output ends of selected power units are connected in parallel to form one direct current output of the power converter. The disclosure can simultaneously meet loads with different requirements without adding additional DC/DC converters, thereby reducing consumption generated in a power conversion process.