Emergency Lighting System with PV Charging and SOC Threshold
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Solution Overview
Problem
Emergency lighting systems rely on grid power and batteries, failing to maintain illumination when grid power is unavailable due to battery depletion.
Innovation Solution
An emergency lighting system with energy storage means chargeable by a photovoltaic system or power grid, operable above a state of charge threshold for non-emergency conditions, and using reserved energy for emergency lighting, allowing for extended operation during grid failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If emergency lighting systems rely on grid power and batteries, then emergency illumination can be maintained when grid power fails, but the system fails to maintain illumination when grid power is unavailable due to battery depletion
Solution Approach 1:
The system performs preliminary charging of the battery during non-emergency periods when grid power is available, storing energy in advance for emergency use. The control unit manages charging during daytime or off-peak hours to ensure sufficient charge is reserved before emergencies occur, extending the duration of emergency illumination without requiring larger batteries.
Solution Approach 2:
The system dynamically adjusts its operation between charging mode (non-emergency) and discharging mode (emergency). The control unit monitors battery charge levels and automatically switches between accepting charge from the grid and supplying power to lighting, optimizing the balance between battery longevity and emergency illumination duration.
2Duration of action of moving object
If a high-capacity battery system is used for emergency lighting, then sustained emergency illumination is maintained, but battery cost and system complexity increase
Solution Approach 1:
The system pre-charges the battery during non-emergency periods, ensuring sufficient energy is stored before emergencies occur. This allows the use of a moderately sized battery that can sustain emergency illumination for the required duration when fully charged in advance, rather than requiring an excessively large battery to provide the same duration from a depleted state.
Solution Approach 2:
The system uses the building's existing photovoltaic system to charge the battery during daytime, making the battery system self-sufficient. This eliminates or reduces the need for grid power and large battery capacity, as the PV system continuously replenishes the battery during normal operation, extending emergency service time without increasing battery size.
3Reliability
If the energy storage means is operated above a state of charge threshold under non-emergency conditions, then battery life is extended and emergency charge is preserved, but the available energy for non-emergency lighting is limited
Solution Approach 1:
The system charges the battery to the threshold level during non-emergency periods, preserving the charge above the threshold for emergency use. The control unit manages energy distribution to ensure the threshold is maintained while still allowing limited non-emergency operation from the excess charge, optimizing both battery longevity and available energy.
Solution Approach 2:
The photovoltaic system continuously charges the battery during daytime operation, replenishing the charge that is reserved above the threshold. This allows the system to maintain the threshold level for battery protection while still providing energy for non-emergency lighting from the PV system, rather than depleting the battery reserve.
4Reliability
If the emergency lighting system uses a modular energy storage means, then system reliability and flexibility are improved, but device complexity and installation requirements increase
Solution Approach 1:
The battery system is divided into modular units that can be independently managed and replaced. Each module can be charged and discharged independently, allowing the system to maintain reliability even if one module fails. The control unit manages multiple modules, distributing charge and discharge loads to extend overall system life while providing redundancy for emergency illumination.
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 ensures sustained emergency illumination during grid failures, reduces battery requirements, enhances reliability and self-sufficiency, and is environmentally friendly, while being cost-effective and compatible with Smart Grid energy management.
Implementation Method 1
energy storage means chargeable by a photovoltaic (PV) system
Data Source
Figure 1
Figure 2
AI summary
An emergency lighting system (1) is provided, comprising energy storage means (101) chargeable by a photovoltaic system (102) and/or a power grid (103) connectable to the emergency lighting system (1); and operable above a state of charge (SOC) threshold (104) under non-emergency conditions; and an emergency lighting driver (105) operable to drive lighting means (106) connectable to the emergency lighting system (1) off the energy storage means (101) in response to emergency conditions, using a charge below the SOC threshold (104) reserved for emergency response. This sustainably maintains a level of emergency illumination when grid power fails.