DC/AC Converter Design for Enhanced Stability and Efficiency
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Summary
Problems
Existing DC/AC converters deviate from desired electric behavior under changes in operating conditions, such as varying loads or power flow direction, leading to unacceptable performance and accuracy issues.
Innovation solutions
A DC/AC converter design with a galvanic isolation stage and a neutral phase point within the DC/AC conversion stage, eliminating the need for a separate voltage reference and reducing circuit components, allowing for symmetric power transfer and improved control through a series connection of converter circuits and transformer circuits.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a separate voltage reference and neutral terminal are provided in the DC/AC conversion stage, then the AC voltage system can be conditioned properly, but the circuit complexity increases and sensitivity to operating condition changes worsens
Why choose this principle:
The invention extracts the neutral terminal function from the DC/AC conversion stage and relocates it to the DC/DC conversion stage. Specifically, the neutral terminal is formed at the connection point between two second side converter circuits in the series connection, eliminating the need for a separate voltage reference circuit in the DC/AC stage and reducing overall circuit complexity while maintaining proper AC voltage conditioning
Principle concept:
If a separate voltage reference and neutral terminal are provided in the DC/AC conversion stage, then the AC voltage system can be conditioned properly, but the circuit complexity increases and sensitivity to operating condition changes worsens
Why choose this principle:
The invention uses the connection point between two second side converter circuits as an intermediary element that serves dual purposes: it acts as both a power transmission node in the series connection and as the neutral terminal for the AC voltage system. This intermediary point provides the voltage reference without requiring additional dedicated components
Application Domain
Data Source
AI summary:
A DC/AC converter design with a galvanic isolation stage and a neutral phase point within the DC/AC conversion stage, eliminating the need for a separate voltage reference and reducing circuit components, allowing for symmetric power transfer and improved control through a series connection of converter circuits and transformer circuits.
Abstract
A DC/AC converter includes a DC/DC conversion stage with galvanic isolation and a DC/AC conversion stage, wherein the DC/DC conversion stage comprises a pair of first side terminals providing or receiving a first DC voltage, a pair of second side terminals providing or receiving a second DC voltage and coupled to the DC/AC conversion stage, at least one first side converter circuit coupled between the pair of first side terminals, a series connection of a plurality of second side converter circuits coupled between the pair of second side terminals, and at least one transformer circuit coupling the plurality of second side converter circuits to the at least one first side converter circuit, wherein a connection point between two of the plurality of second side converter circuits is coupled to the DC/AC conversion stage and forms a neutral phase point thereof.