Discrete-Level Multilevel Converter Circuit for Soft Switching
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Solution Overview
Problem
Conventional converters face inefficiencies due to 'hard' switching methods, leading to high switching losses, especially at high frequencies, and require improved topologies and methodologies to enhance energy conversion efficiency and reduce costs.
Innovation Solution
A multi-level converter system that includes a selection unit to manage multiple discrete output voltages, allowing for soft switching and efficient conversion of DC to AC voltage, utilizing a combination of SIMLO and MIMO converters with a selector unit to optimize voltage levels and reduce power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If hard switching method is used in conventional converters, then the converter can operate at high switching frequency, but switching losses increase significantly causing reduced energy conversion efficiency
Solution Approach 1:
The patent segments the voltage conversion process into multiple discrete voltage levels (first converter produces multiple first discrete output voltages, second converter further divides these into two discrete states). This segmentation allows the switching operation to occur at lower voltage levels individually, reducing switching losses while maintaining high overall switching frequency capability.
Solution Approach 2:
The patent introduces a multi-level voltage dimension by creating multiple discrete output voltage levels from a single input voltage. Instead of direct single-stage conversion, the system creates intermediate voltage levels that enable softer switching transitions, effectively adding a voltage level dimension to the conversion process.
2Loss of energy
If multi-level converter topology is used to reduce switching losses, then energy conversion efficiency improves, but device complexity increases due to multiple converters and selection units
Solution Approach 1:
The patent merges the functions of multiple voltage conversion stages into a coordinated system where the first converter and second converter work together with a selection unit. The selection unit intelligently combines outputs from multiple parallel conversion paths, achieving the benefits of multi-level topology while managing complexity through functional integration.
Solution Approach 2:
The selection unit serves multiple functions: it selects appropriate output voltages from the first converter, coordinates with the second converter for further voltage division, and provides the final AC output. This multi-functional component reduces the need for separate control systems for each conversion stage.
Data Source
AI summary
A power conversion system includes a first converter configured to convert an input voltage into discrete voltage levels, and provide each discrete voltage level at a corresponding output terminal. The power conversion system further includes a second converter configured to convert the discrete voltages into modulated voltages. The power conversion system further includes a selection unit configured to alternatively output each of the modulated voltage voltages across a pair of output terminals.