AC-LED and DC-LED Lighting Device with Temperature-Adaptive Battery Charging
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Solution Overview
Problem
Existing lighting devices with AC-LEDs and DC-LEDs face challenges in maintaining battery charge efficiency and preventing overheating, which can lead to reduced battery life and potential damage during emergency power usage.
Innovation Solution
A lighting device that utilizes both AC-LEDs and DC-LEDs powered directly from an AC power supply without conversion, incorporating a battery charging system with temperature-dependent charging rates and overheating protection, along with a power outage sensing circuit to manage light source operation efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a battery charging circuit is provided to charge the battery from AC power, then the battery can be charged during normal operation, but additional electronic components generate heat and take up space
Solution Approach 1:
The lighting device is divided into two separate lighting systems: AC-LEDs powered directly from AC power supply and DC-LEDs powered from battery. This segmentation allows the AC-LEDs to operate independently during normal power supply, reducing the heat load on the battery and enabling more efficient battery charging without overheating concerns.
Solution Approach 2:
The system changes the power source parameter dynamically: during normal operation, AC-LEDs are powered from AC supply (avoiding battery discharge and heat generation from power conversion), and during power outage, DC-LEDs are powered from battery. This parameter change optimizes both charging efficiency and temperature management.
2Adaptability or versatility
If AC to DC conversion is implemented to power DC-LEDs from AC supply, then DC-LEDs can operate during normal power supply, but power conversion devices generate heat and reduce reliability
Solution Approach 1:
The invention extracts the power conversion requirement entirely by providing two separate lighting paths: one that accepts AC power directly (AC-LEDs) and another that uses battery power (DC-LEDs). This eliminates the need for AC-to-DC conversion circuits, removing the source of heat generation and component failure risks while maintaining operational versatility.
Solution Approach 2:
The lighting device achieves multi-functionality through dual lighting systems that can operate independently or in combination. AC-LEDs handle normal powered operation, DC-LEDs provide emergency lighting from battery, and both can potentially operate together, providing universal adaptability without requiring power conversion.
3Illumination intensity
If high-powered LEDs are used to illuminate larger areas, then lighting coverage is improved, but heat generation increases and components are more prone to failure
Solution Approach 1:
The high-powered LED system is segmented into two independent groups with different power sources: AC-LEDs for primary illumination during normal operation and DC-LEDs for emergency lighting. This segmentation distributes the heat load across two separate systems, preventing excessive temperature accumulation in a single battery-powered system and improving overall reliability.
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 solution ensures efficient battery charging and extended battery life by adapting charging rates based on temperature, while effectively distinguishing between power outages and light switch conditions to optimize emergency lighting functionality.
Implementation Method 1
incorporating a battery charging system with temperature-dependent charging rates and overheating protection
Implementation Method 2
a new approach for lighting has been the development of AC-LEDs, which can operate directly from an AC power supply
Implementation Method 3
The DC-LEDs, or a portion thereof, may have power supplied from a battery to provide emergency lighting during a power outage
Data Source
AI summary
A lamp device with power outage sensing abilities to detect when a primary power source is interrupted and to energize primary LEDs when primary power source is ON, and to energize backup LEDs when the primary power source is OFF. The power outage sensing circuit may also detect a light switch condition allowing for greater efficiency in emergency power supply usage. A battery charging system may provide battery thermal protection and multiple charge rates to improve battery charging as a function of the temperature in the lighting device.