Self-Charging Backup Power Supply for LED Lighting via Driver Harvesting
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Solution Overview
Problem
Existing backup power supplies for lighting systems require continuous charging from building line power, limiting their placement flexibility and efficiency, especially for LED lighting systems that consume high current, necessitating a solution to harness power directly from LED drivers for charging energy storage devices.
Innovation Solution
A power supply system that senses variable voltage from LED devices, using a DC-DC boost converter to charge batteries while maintaining LED brightness at a predetermined percentage during power failures, employing a controller to manage voltage and current, and utilizing various power loss detection methods to adapt to different applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If backup power supplies are charged continuously from building line power, then the battery charge level is maintained, but the placement flexibility of backup units is limited and line power dependency increases
Solution Approach 1:
The backup power supply charges itself by harvesting power from the LED driver during normal operation. The system uses the LED driver's output power to charge the battery through a power management circuit, eliminating dependency on building line power for charging and enabling flexible placement anywhere LED drivers are located.
2Use of energy by moving object
If LED lighting systems consume high current for normal operation, then adequate lighting is provided, but the requirement for line power charging increases and placement flexibility decreases
Solution Approach 1:
The system harvests a small portion of power from the LED driver (excessive action beyond minimum needs) to charge the battery. During normal operation, the LED driver provides full lighting output, and the excess power capability is used to charge the battery, ensuring adequate lighting while enabling self-charging functionality.
Solution Approach 2:
The backup power supply becomes self-sufficient by using the LED driver's power output to charge its own battery through a dedicated power management circuit, eliminating the need for separate line power connections and enabling flexible placement.
3Reliability
If backup units are located in proximity to building power outlets, then continuous charging is ensured, but system complexity and installation requirements increase
Solution Approach 1:
The backup unit charges itself by harvesting power from the nearby LED driver through an integrated power management circuit. This eliminates the need for separate line power connections and complex installation requirements, while ensuring continuous charging as long as the LED driver is operational.
Solution Approach 2:
The power management circuit serves multiple functions: it monitors LED driver output voltage, regulates charging current to the battery, and manages power flow during normal and emergency conditions. This multi-functionality reduces overall system complexity while ensuring reliable continuous charging.
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
Enables self-powering backup systems that can charge batteries independently of line power, maintaining LED brightness during outages with minimal impact on the lighting system, and allowing flexible placement of backup units, enhancing safety and efficiency.
Implementation Method 1
a DC-DC boost converter supplies the necessary voltage taking current from the battery to maintain the LEDs at some percentage of LED's nominal value
Implementation Method 2
a power supply that senses the variable voltage on LED devices and uses this voltage to force current into a storage device like a battery to charge it
Data Source
AI summary
A power supply that senses the variable voltage on LED devices and uses this voltage to force current into a storage device such as a battery to charge it. When power fails, a DC-DC boost converter supplies the necessary voltage taking current from the battery to maintain the LEDs at percentage nominal current level.