Capacitor-Based Aircraft Emergency Lighting With Reduced Wiring

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Solution Overview

Problem

Existing aircraft emergency lighting systems are heavy, costly, and environmentally impactful due to the need for periodic battery replacement and extensive wiring, while requiring conservative certification analysis, which increases operational costs and weight.

Innovation Solution

An autonomous emergency lighting system utilizing independent illumination units with rechargeable capacitors and control circuits, eliminating the need for dedicated battery packs and reducing wiring, and enabling independent operation from the main power source.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional battery-powered emergency lighting systems are used, then reliable emergency illumination is ensured, but system weight increases and periodic maintenance is required

Engineering Contradiction:

Improveemergency illumination reliabilityVSAvoidsystem weight

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent changes the energy storage parameter from chemical (batteries) to electrical (capacitors), eliminating the need for periodic replacement while reducing weight. The capacitor-based system maintains reliable emergency illumination without the maintenance burden of battery systems.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent eliminates disposable batteries by using rechargeable capacitors that can be recharged from the aircraft's main power system, removing the need for periodic replacement and reducing overall system weight while maintaining reliability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If dedicated battery packs are installed in each illumination unit, then emergency operation is guaranteed, but device complexity and maintenance requirements increase

Engineering Contradiction:

Improveemergency operation guaranteeVSAvoidsystem complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the power supply function into the aircraft's main electrical system, eliminating dedicated battery packs from each unit. The capacitor in each unit is charged from the main power system, simplifying the overall architecture while ensuring emergency operation capability.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent makes the aircraft's main power system serve multiple functions: normal operation and emergency illumination. The capacitor-based design allows the same power infrastructure to support both modes, reducing system complexity while maintaining reliability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Illumination intensity

If extensive wiring harnesses are used to distribute power to all lighting units, then complete illumination coverage is achieved, but system weight and installation complexity increase

Engineering Contradiction:

Improvecabin illumination coverageVSAvoidwiring weight

Core Design Contradiction:

Illumination intensityVSWeight of moving object

Solution Approach 1:

The patent segments the power supply function to each illumination unit via local capacitors, reducing the need for extensive heavy-gauge wiring. Each unit has its own energy storage capability, allowing for lighter local connections while maintaining complete illumination coverage.

Inventive Principle:

Principle #1Segmentation

4Reliability

If conservative certification analysis is performed for the lighting system, then safety requirements are met, but engineering time and cost increase

Engineering Contradiction:

Improvesafety certificationVSAvoidengineering time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The capacitor-based system with automatic charging from the main power system and power failure detection reduces the need for complex certification analysis. The system's inherent simplicity and automatic operation reduce engineering time while meeting safety requirements.

Inventive Principle:

Principle #25Self-service

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

The system reduces weight, maintenance, and environmental impact by eliminating battery replacement, simplifying maintenance procedures, and decreasing engineering hours for certification, while ensuring reliable emergency illumination.

Implementation Method 1

An autonomous emergency light unit powered by an external power supply or a rechargeable power source, at least one LED, and a control logic for a plurality of states

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS12559242B2Autonomous unit for emergency lighting system for aircraft, eVTOLs, VTOLs and rotorcraft

Publication Date: 2026.02.24 EMBRAER SA

AI summary

A light unit executes up to three different functions (cabin area illumination, individual/dedicated/decorative illumination and emergency illumination) and an emergency illuminated sign unit, each one with an internal controller and a rechargeable capacitor. An example non-limiting embodiment also provides a cabin light system and an emergency lighting system, where each illumination unit (light source or illuminated sign) is as described above.