DC/AC Converter Neutral Phase Point Voltage Reference
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Solution Overview
Problem
Existing DC/AC converters exhibit unacceptable deviations from desired electric behavior under varying operating conditions, such as changes in electric loads or power flow direction, due to the introduction of signal artefacts from separate half bridge converters used for voltage references.
Innovation Solution
The proposed DC/AC converter eliminates the need for a separate half bridge converter by integrating a neutral phase point within the DC/DC conversion stage, using a series connection of second side converter circuits to provide a reliable reference point, reducing circuit components, and allowing for bidirectional power transfer with symmetric power transfer characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate half bridge converter is used to provide voltage reference, then the DC/AC conversion stage can be implemented, but signal artefacts are introduced that cause unacceptable deviations from desired electric behavior
Solution Approach 1:
The invention extracts and eliminates the separate half bridge converter that generates signal artefacts. By removing this component from the system, the harmful signal artefacts are eliminated while the voltage reference function is provided differently through the modified DC/DC conversion stage topology.
Solution Approach 2:
The invention merges the voltage reference function into the DC/DC conversion stage by utilizing the connection point between second side converter circuits. This integration eliminates the need for a separate half bridge converter and its associated signal artefacts, combining multiple functions into a unified structure.
2Ease of manufacture
If separate half bridge converters are used for voltage references, then the DC/AC conversion can be achieved, but the circuit complexity and space requirements increase
Solution Approach 1:
The invention combines the voltage reference function with the existing DC/DC conversion stage structure. By utilizing the connection point between second side converter circuits as the neutral phase point, the design eliminates separate reference circuits and reduces overall system complexity.
Solution Approach 2:
The connection point between second side converter circuits serves multiple functions: it provides the neutral phase point for AC voltage generation and simultaneously serves as the voltage reference point. This multi-functionality reduces the need for additional dedicated components.
3Reliability
If separate half bridge converters are used to provide voltage reference, then the reference can be established, but the converter requires more space and power
Solution Approach 1:
The invention removes the separate half bridge converter that consumes additional power. By eliminating this component, the system reduces its power consumption while maintaining voltage reference accuracy through the integrated approach using existing converter circuit connections.
4Adaptability or versatility
If the DC/AC converter is designed to handle varying operating conditions, then the adaptability improves, but the behavior deviates from desired electric behavior under load changes
Solution Approach 1:
The invention integrates the voltage reference function directly into the power conversion path of the DC/DC stage. This integration ensures that the reference voltage naturally tracks with power flow direction and load changes, maintaining consistent electric behavior across varying operating conditions without requiring separate control mechanisms.
Data Source
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AI summary
A DC/AC converter (2) comprises a DC/DC conversion stage (4) with galvanic isolation and a DC/AC conversion stage (6), wherein the DC/DC conversion stage (4) comprises a pair of first side terminals (10) providing or receiving a first DC voltage, a pair of second side terminals (12) providing or receiving a second DC voltage and coupled to the DC/AC conversion stage (6), at least one first side converter circuit (20, 22) coupled between the pair of first side terminals (10), a series connection of a plurality of second side converter circuits (30, 32) coupled between the pair of second side terminals (12), and at least one transformer circuit (40, 44) coupling the plurality of second side converter circuits (30, 32) to the at least one first side converter circuit (20, 22), wherein a connection point (34) between two of the plurality of second side converter circuits is coupled to the DC/AC conversion stage (6) and forms a neutral phase point thereof.