Five-Level Active Clamping Converter Reducing Switch Count
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Solution Overview
Problem
Traditional five-level multilevel converters, such as the active-neutral-point-clamped (ANPC) topology, require a large number of controllable semiconductor switches, leading to high costs and complexity, especially as the number of voltage levels increases.
Innovation Solution
A five-level active neutral-point clamped converter design utilizing six bidirectional switches and a flying capacitor, with fewer controllable semiconductor switches, reducing the overall number of switches and costs while maintaining efficiency and multi-level output capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional five-level ANPC topology is used, then multi-level output capability is achieved, but the number of controllable semiconductor switches increases leading to high cost
Solution Approach 1:
The patent merges the functions of multiple switches by using bidirectional switches that can operate in both forward and reverse directions. The bidirectional switches combine the functionality of what would traditionally require separate forward and reverse switches, thereby reducing the total number of controllable semiconductor switches while maintaining the five-level output capability
Solution Approach 2:
The bidirectional switches are designed to perform multiple functions: they can conduct current in both directions, provide voltage clamping, and enable multiple voltage level outputs. This multi-functionality allows a single switch to replace what would traditionally require multiple specialized switches, reducing overall device complexity
2Adaptability or versatility
If more voltage levels are generated using traditional NPC topology with diodes, then multi-level output is achieved, but the number of switching devices and diodes increases
Solution Approach 1:
The patent combines the voltage clamping function and the switching function into bidirectional switches, eliminating the need for separate diodes that would traditionally be required for voltage clamping in NPC topologies. This merging reduces the total quantity of switching devices while maintaining five-level output capability
Solution Approach 2:
The flying capacitor serves as an intermediary energy storage element that enables voltage level generation without requiring additional switching devices. By using the flying capacitor to store and transfer energy, the topology achieves multi-level output with fewer active switching components
Data Source
AI summary
A single-phase five-level active clamping converter unit and a converter. The single-phase five-level active clamping converter unit has three input ends and one output end, and also comprises: a suspension capacitor and a topological control portion. The topological control portion is connected to the suspension capacitor and the three input ends and one output end of the single-phase five-level active clamping converter unit, is connected to a plurality of control ends, and is suitable for the supply of at least eight operating modes under the control of a control signal accessing the control ends. In the single-phase five-level active clamping converter unit, a topological structure is easy to design, and is simple and convenient to control.