Battery LED Light with Ambient Sensor for Compartment Illumination
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Solution Overview
Problem
Battery-powered LED light sources in compartments often waste energy due to manual toggling or require costly wiring and installation, and existing solutions like timers and proximity sensors are either inconvenient or expensive.
Innovation Solution
A battery-powered LED light source with an integrated ambient light sensor using the same lens as the LED, which automatically turns on when the compartment is opened and off when closed, featuring strobing to measure light levels and alert users if the compartment is left open, allowing for efficient power use and easy installation without additional cabling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual toggle switch is used to control LED light source, then user can turn lights on and off, but users forget to turn off lights resulting in frequent battery replacement
Solution Approach 1:
The system automatically detects compartment door opening through ambient light sensor and turns on the LED light source without user intervention. The light remains on until the compartment is closed and ambient light levels return to baseline, eliminating the need for manual switching and preventing energy waste from forgotten lights.
Solution Approach 2:
The ambient light sensor continuously monitors light levels and provides feedback to the control circuit, which automatically adjusts the LED light source state accordingly. This closed-loop feedback system ensures lights are on only when the compartment is open and off when closed, preventing energy waste.
2Loss of energy
If turn-off timer is used to automatically shut off LEDs, then battery power is conserved, but user must manipulate toggle switch to turn light on which is inconvenient when hands are full
Solution Approach 1:
The ambient light sensor automatically detects when the compartment door is opened and triggers the LED light source to turn on without requiring any user action. The system serves itself by using environmental light changes as the trigger mechanism, providing both automatic activation and deactivation.
Solution Approach 2:
The mechanical toggle switch operation is replaced by an optical sensing system that detects ambient light changes caused by door opening. This substitution eliminates the need for manual mechanical switching while maintaining automatic light control based on compartment state.
3Loss of energy
If tethered door switch is used to actuate light on door open/off on door closed, then battery is used efficiently, but additional cost of cabling and remote door switch is required and installation takes extra time
Solution Approach 1:
The ambient light sensor and LED light source are merged into a single integrated module that uses the same lens for both illumination and sensing functions. This consolidation eliminates the need for separate door switches, cabling, and remote actuators, simplifying installation while maintaining efficient battery usage.
Solution Approach 2:
The lens serves dual functions as both the light emission aperture for the LED and the light collection aperture for the ambient light sensor. This multi-functionality reduces component count and eliminates the need for separate door switching mechanisms and associated cabling.
4Loss of energy
If proximity sensor with passive infrared sensors is used to sense motion and trigger LED source, then power waste is reduced, but special placement is required and product cost increases
Solution Approach 1:
The ambient light sensor is integrated with the LED light source in a single module, sharing the same lens and housing. This merging eliminates the need for separate proximity sensors with specific placement requirements, reducing device complexity while maintaining automatic light control based on compartment state.
Solution Approach 2:
Instead of using complex passive infrared proximity sensors, the system uses a simpler ambient light sensor that detects light level changes caused by door opening. This copying of the door state information through light detection achieves the same power conservation goal with simpler, cheaper components.
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 solution provides a low-cost, efficient, and convenient method to conserve battery power by automatically controlling LED light sources based on ambient light, reducing unnecessary battery drain and allowing for easy portability and installation, while ensuring compartments are illuminated only when needed.
Implementation Method 1
A battery-powered LED light source with an integrated ambient light sensor using the same lens as the LED
Implementation Method 2
battery powered light emitting diode (LED) light sources
Data Source
AI summary
A battery powered LED light source is described for illuminating the inside of a dark enclosure when the enclosure is opened in an environment with ambient illumination. Drive circuitry adapted to the LED light source turns on the LEDs when levels of ambient light above a threshold are detected, which may occur if the light source is placed in a dark enclosure that is opened in a lit room. After being opened, the drive circuitry periodically strobes off the LED light source to take ambient light measurements without the contribution of its own LED light for determining if the enclosure has been closed and the LED light source should again be shut off.