Alternating Series-Parallel Power Converter Modules
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Solution Overview
Problem
Conventional power electronics systems with inverter modules connected in series cannot shut down individual modules during partial load operation, limiting efficiency and requiring higher voltage components, which are costly.
Innovation Solution
A converter device with two converter units connected in series on both input and output sides, allowing dynamic switching between them, and operated alternately by a control device to achieve efficient partial load operation and reduce voltage load on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If inverter modules are connected in series, then voltage load on individual components is reduced, but individual module shutdown during partial load operation becomes impossible
Solution Approach 1:
The system dynamically switches between series and parallel configurations based on load conditions. During partial load operation, the system can reconfigure to parallel connection to enable individual module shutdown, while during full load operation, it uses series connection to reduce voltage load on components.
Solution Approach 2:
The connection configuration parameter (series/parallel) is changed based on operating conditions. By switching between different connection modes, the system adapts to partial load conditions while maintaining the ability to shut down individual modules when needed.
2Power
If higher voltage components are used to handle series connection voltages, then series operation becomes possible, but system cost increases
Solution Approach 1:
The system uses lower voltage components that can operate in series during full load conditions, but reconfigures to parallel connection during partial load operation. This dynamic reconfiguration allows the use of cheaper, lower voltage components while still achieving the required power handling capability when needed.
Solution Approach 2:
The power conversion function is segmented across multiple converter units that can be independently controlled and reconfigured. This segmentation allows flexible connection arrangements (series during full load, parallel during partial load) using standard voltage components rather than requiring expensive high-voltage components.
3Adaptability or versatility
If converter units are operated alternately with rapid switching, then individual module shutdown becomes possible in series connection, but control complexity increases
Solution Approach 1:
The converter units are operated in periodic alternating fashion with rapid switching between them. This periodic operation enables effective shutdown of individual modules in series connection by quickly alternating which unit is active, creating an effective shutdown capability through time-division multiplexing.
Data Source
Figure 1~2
Figure 3
AI summary
The approach presented here relates to a converter device (105) for power electronics. The converter device (105) has an input interface (110), an output interface (115), a first converter unit (120), and a second converter unit (125). The input interface (110) is configured to provide an input voltage, and the output interface (115) is configured to provide an output voltage. The first converter unit (120) and the second converter unit (125) are configured to convert the input voltage into the output voltage and are connected between the input interface (110) and the output interface (115). The first converter unit (120) and the second converter unit (125) are connected in series on the input and/or output side.