Elevator Emergency LED Power Supply Assembly
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Solution Overview
Problem
Existing elevator emergency lighting systems are unable to power LED lamps and LED drivers, as they are designed for AC power and cannot handle the DC power required by LEDs, and there is a need for a backup power solution that provides consistent and controlled current to LEDs during primary power loss.
Innovation Solution
An elevator emergency LED lighting power supply assembly that includes a battery, an inverter configured to output AC power, an LED driver connected to the inverter to provide DC power, and a relay that switches between primary and backup power sources, ensuring consistent current output to LED lamps, with features like automatic voltage ramping and a battery charger for extended battery life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inverter is used to provide AC power to emergency lighting, then backup power is available, but the system cannot power LED lamps that require DC power
Solution Approach 1:
An LED driver is introduced as an intermediary component between the inverter and LED lamps. The LED driver receives AC power from the inverter and converts it to the appropriate DC power for LED operation, enabling compatibility between the AC-based emergency power system and DC-requiring LED lamps.
Solution Approach 2:
The LED driver is designed to accept AC power input and provide DC power output suitable for LED operation, making it a multi-functional component that bridges the gap between AC emergency power systems and DC LED lighting requirements.
2Reliability
If separate power conditioning components are used for emergency and primary power, then each power source can be optimized, but the system complexity increases
Solution Approach 1:
The LED driver is designed to handle both emergency AC power from the inverter and primary AC power from the building electrical system, consolidating multiple power conditioning functions into a single component and reducing overall system complexity.
Solution Approach 2:
The patent combines the emergency power conditioning and primary power conditioning functions into a single LED driver unit, eliminating the need for separate conditioning components for each power source and simplifying the overall system architecture.
3Adaptability or versatility
If a relay switches between primary and backup power sources, then power source flexibility is improved, but current consistency to LEDs may be compromised
Solution Approach 1:
The LED driver incorporates feedback mechanisms that continuously monitor the power input and adjust its output to maintain consistent current to the LEDs, regardless of whether the power source is primary or emergency, ensuring stable LED operation during power source transitions.
Solution Approach 2:
Instead of allowing power source characteristics to directly affect LED current, the system inverts the approach by having the LED driver actively regulate and control the output current based on the input power characteristics, ensuring consistency regardless of the power source being used.
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 assembly allows reliable powering of LED lamps through either primary or backup power, maintaining consistent current output and extending battery life, while meeting elevator code requirements for illumination and reducing the need for additional wiring.
Implementation Method 1
The power supply assembly may include a battery and an inverter that's connected to and configured to receive DC power from the battery
Implementation Method 2
an inverter that's connected to and configured to receive DC power from the battery and to output AC backup power
Implementation Method 3
an LED driver that's connected to the inverter, is connectable to an LED lamp of the elevator lighting system, and that's configured to receive AC power from the inverter and to output DC power sufficient to power an LED lamp
Data Source
AI summary
An elevator emergency LED lighting power supply assembly including an inverter that receives DC power from a battery and outputs backup power to LED lamps of an elevator lighting system. An LED driver is connected to the inverter, is connectable to an LED lamp of the elevator lighting system, receives AC power from the inverter, and outputs DC power sufficient to power an LED lamp. A relay is connected between the inverter and the LED driver, is connectable to a primary elevator electrical power supply, and allows AC power to flow from a primary elevator electrical power supply to elevator lighting system LEDs through the LED driver as long as AC power is available from a primary elevator electrical power supply. Upon loss of power from the primary elevator power supply the relay switches contacts and provides to the LED driver AC power received from the inverter.