High-Voltage DC Voltage Unit Bipolar Supply Common-Mode Fluctuations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing high-voltage DC voltage units in aircraft experience undesirable fluctuations in common-mode output voltage and lack resilience against failures in DC voltage potential connections, requiring additional safety measures and filter stages.
Innovation Solution
A high-voltage DC voltage unit comprising two DC voltage apparatuses with independent operation, coupled with a reference potential and earth connection, utilizing uncontrolled rectifiers or four-quadrant actuators, and optionally a multi-level NPC power converter to provide a bipolar power supply, reducing common-mode voltage fluctuations and enhancing redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single DC voltage apparatus is used with neutral point wiring, then the device complexity is reduced, but common-mode output voltage fluctuations increase and reliability decreases
Solution Approach 1:
The patent divides the DC voltage supply into two independent DC voltage apparatuses (first and second apparatuses), each with separate output connections. This segmentation allows independent operation of each apparatus, so that if one fails, the other can continue to supply power, thereby improving reliability without significantly increasing overall system complexity.
Solution Approach 2:
The patent implements protective circuits between the connection poles and reference potential that are pre-configured to detect and respond to connection failures. These circuits provide beforehand cushioning by having safety measures already in place that activate automatically upon failure detection, preventing complete system collapse and maintaining operational reliability.
2Reliability
If protective circuits are added between connection poles and reference potential, then reliability against connection failure is improved, but device complexity increases
Solution Approach 1:
The patent combines the protective circuit functions with the existing DC voltage apparatus structure. The protective circuits are integrated into the overall system architecture rather than being completely separate additions, allowing them to share components and control logic with the main voltage generation and distribution system, thereby limiting the increase in device complexity.
3Object-affected harmful factors
If filter stages are added downstream of rectifier, then common-mode voltage fluctuations are reduced, but device complexity increases
Solution Approach 1:
The patent extracts the common-mode voltage fluctuation problem from the output stage and addresses it at the source by using two independent DC voltage apparatuses with separate reference potentials. This approach removes the need for additional filter stages downstream, as the fluctuation issue is prevented rather than corrected, thereby reducing device complexity while still eliminating harmful voltage fluctuations.
Data Source
AI summary
A high-voltage DC voltage unit with a first DC voltage apparatus providing a first high-voltage DC voltage between a first output connection and a second output connection of the DC voltage apparatus or can be fed with a first high-voltage DC voltage. A second DC voltage apparatus provides a second high-voltage DC voltage or can be fed with a second high-voltage DC voltage. A first DC voltage connection is coupled with the first output connection of the first DC voltage apparatus. A second DC voltage connection is coupled with the second output connection of the second DC voltage apparatus. A reference potential connection is coupled with the second output connection of the first DC voltage apparatus, with the first output connection of the second DC voltage apparatus and with an earth potential, the first and second high-voltage DC voltages realizing a bipolar power supply.