Aircraft Seat Power Supply Redundancy With Converter Failover
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Solution Overview
Problem
Aircraft seat power supply systems face challenges in providing redundancy while minimizing weight and componentry, with existing designs either increasing weight or adding failure modes by using multiple power supply units or incorporating redundancy, which complicates meeting different Design Assurance Levels (DAL) requirements.
Innovation Solution
A redundant power supply system with a primary and secondary AC to DC power converter module, connected via a power supply link, where the secondary module monitors the primary's performance and takes over in case of failure, ensuring full redundancy and transparency to peer systems like In-Flight Entertainment, while reducing overall system weight and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power supply units are used to provide redundancy, then reliability is improved, but weight and device complexity increase
Solution Approach 1:
The patent merges the primary and secondary power supply modules into a single integrated unit sharing common components (housing, control circuitry, communication interfaces). The secondary module shares the same physical space and component infrastructure as the primary module, allowing redundancy without proportional weight increase. When failover occurs, the secondary module assumes full operational duty while the primary module transitions to standby, maintaining reliability without requiring completely separate redundant systems.
Solution Approach 2:
Both power supply modules are designed with identical multi-functional capabilities, including AC-to-DC conversion, DC-to-DC conversion, communication bus interfacing, and control functions. Each module can independently perform all required functions, allowing either module to fully replace the other during failover. This universality enables a single integrated housing to contain two complete power supply systems rather than requiring separate dedicated units.
2Reliability
If multiple power supply units are used to provide redundancy, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple power supply modules within a single integrated housing structure, sharing common mechanical support, electrical grounding, and control infrastructure. The control circuitry and communication interfaces are consolidated rather than duplicated, reducing the overall component count and interconnection complexity. This merging approach maintains reliability through redundancy while avoiding the complexity multiplication that would result from completely separate systems.
Solution Approach 2:
The secondary power supply module is designed as a functional copy of the primary module, replicating essential power conversion and control functions. This copying approach allows the secondary module to assume full operational capability during failover without requiring complex custom design. The modular copy-paste architecture simplifies system integration and reduces the complexity of managing truly heterogeneous redundant systems.
3Reliability
If redundant power supply components are added, then reliability is improved, but the number of failure modes increases
Solution Approach 1:
The patent merges critical components (housing, control circuitry, communication interfaces) into shared infrastructure that serves both primary and secondary modules. By consolidating these elements rather than duplicating them, the system reduces the total number of potential failure points. The shared components are designed with higher reliability standards and undergo more rigorous testing, offsetting the introduction of redundant power conversion paths.
4Weight of stationary object
If a single power supply unit is used, then weight and complexity are reduced, but redundancy and reliability are lost
Solution Approach 1:
The patent integrates two complete power supply modules within a single housing structure, allowing the system to maintain full operational capability through either module. This merging provides redundancy without requiring two separate physical installations, reducing overall system weight and space requirements compared to completely separate redundant systems.
5Adaptability or versatility
If different DAL-rated components are used, then design flexibility is improved, but system integration complexity increases
Solution Approach 1:
The power supply system is designed with universal interfaces and control logic that can accommodate components with different Design Assurance Level ratings. The primary and secondary modules use standardized communication protocols and control signals, allowing mixed DAL-rated components to be integrated without requiring custom integration logic for each component combination.
Data Source
AI summary
A redundant power supply system for aircraft seats, includes: a first power supply module having a first AC to DC power converter configured to supply power to a first auxiliary board, the first auxiliary board being configured to supply power to a plurality of aircraft seats via a plurality of communication bus channels; a second power supply module having a second AC to DC power converter configured to supply power to a second auxiliary board, the second auxiliary board being configured to supply power to the plurality of aircraft seats via the plurality of communication bus channels; and a power supply link configured to connect the first auxiliary board and the second auxiliary board enabling the first AC to DC power converter to power the second auxiliary board via the power supply link.