Integrated PSU Architecture Reducing Wiring Complexity
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Solution Overview
Problem
Existing passenger service units (PSUs) in aircraft are complex, costly, and require extensive wiring, leading to increased weight and visual clutter, as well as the need for multiple overhead equipment units and separate power conversion modules.
Innovation Solution
A redesigned PSU architecture that integrates power conversion and control functions, reducing electrical wiring and eliminating redundant components by housing essential electrical components, such as heat-sinks, bezels, and wire harnesses, and using a single wire bundle for all layouts, thereby simplifying engineering and reducing part counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If traditional PSU architecture with separate power conversion modules and multiple overhead equipment units is used, then functional requirements are met, but wiring complexity and weight increase
Solution Approach 1:
The patent combines the power conversion module and control module into a single integrated PSU unit. The power conversion circuitry, control circuitry, and passenger service functions are consolidated into one module that mounts directly above the passenger seat, eliminating the need for separate overhead equipment units and reducing wiring complexity throughout the aircraft cabin.
Solution Approach 2:
The integrated PSU performs multiple functions within a single unit: power conversion from 115VAC/28VDC to control voltages, digital communication signal processing, passenger service control, and housing for electrical components. This multi-functional design eliminates redundant components and reduces the overall part count in the aircraft electrical system.
2Adaptability or versatility
If extensive electrical wiring and multiple connectors are used to meet functional requirements, then all components can be powered and controlled, but weight and visual clutter increase
Solution Approach 1:
The patent consolidates power and control wiring into a single integrated unit. The power conversion circuitry is housed within the PSU alongside the control functions, requiring only one wire bundle connection to the aircraft electrical system rather than separate wiring for power conversion modules and control modules.
Solution Approach 2:
The patent extracts the power conversion and control functions from the traditional distributed architecture and places them directly into the PSU housing. This eliminates the need for extensive wiring throughout the overhead equipment units and reduces the wiring harness weight in the aircraft.
3Reliability
If separate power conversion and control modules are used, then functional requirements are met, but part count and service burden increase
Solution Approach 1:
The patent merges the power conversion module, control module, and passenger service unit into a single integrated assembly. This reduces the part count from multiple separate components to one modular unit that can be installed and serviced as a single entity, reducing both installation complexity and maintenance burden.
Solution Approach 2:
While integrating multiple functions, the patent maintains modular internal architecture with distinct power conversion circuitry, control circuitry, and service function modules within the single PSU housing. This segmentation allows for targeted repairs and replacements of specific functional modules without replacing the entire unit, maintaining serviceability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This integrated approach significantly reduces wiring, connectors, weight, and service burden, simplifies engineering, and minimizes part numbers, while providing a more streamlined and efficient passenger service system with coordinated lighting and diagnostics.
Implementation Method 1
incorporates features to convert input power (115 VAC/28 VDC) to supply control voltage
Implementation Method 2
The Integrated PSU concept reduces part count and consolidates components such as heat-sinks, bezels, housings and wire harnesses
Data Source
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Figure 3A
AI summary
Disclosed herein is an overhead passenger service unit (PSU) for a vehicle, comprising: a mounting mechanism for mounting the PSU above at least one vehicle seat; a dynamic seat row marker that provides an indication of a seat position and a status portion indicating a status of a passenger or trip aspect that is readily viewable from a vehicle aisle and is changeable during a trip; and a programmable active display that is readily viewable from a passenger seat and provides trip changeable information about the trip to the passenger.