Emergency Lighting Inverter Auto-Dimming for Fixed LED Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing emergency lighting devices with LED modules face challenges in accurately calculating luminous flux and labeling service time due to varying power consumption among different LED configurations, leading to potential misjudgment of use situations and safety risks.
Innovation Solution
An emergency lighting device with an auto-dimming detection function that includes a sensor, control unit, voltage boost circuit, dimmer, and pulse width modulator to maintain a fixed output current, converting DC to AC for LED modules, ensuring accurate luminous flux calculation and reduced installation costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different numbers of LEDs are used in LED modules, then the light source can be configured for different illumination needs, but power consumption varies making it impossible to accurately label service time and luminous flux
Solution Approach 1:
The patent changes the operating parameter of the LED module by using a dimmer to adjust the drive current to a fixed value. This parameter change ensures that regardless of the number of LEDs in the module, the power consumption remains constant, enabling accurate service time labeling and luminous flux calculation while maintaining configuration flexibility
Solution Approach 2:
The patent employs a feedback mechanism where a sensor detects the actual current consumed by the LED module and feeds this information back to the control unit. The control unit then adjusts the dimmer to maintain a fixed current, ensuring accurate power consumption measurement and consistent luminous flux output across different LED configurations
2Adaptability or versatility
If different numbers of LEDs are used in LED modules, then various illumination requirements can be met, but accurate service time labeling becomes impossible
Solution Approach 1:
The patent maintains fixed power consumption by adjusting the drive current through a dimmer, regardless of LED module configuration. This parameter control enables accurate service time labeling while preserving the ability to meet various illumination requirements through different LED counts
3Ease of operation
If utility power is directly provided to lighting fixtures, then simple illumination is achieved, but during power outage no emergency lighting is provided
Solution Approach 1:
The patent integrates multiple functions into a single system: the emergency lighting device can operate both during normal power conditions (providing supplementary lighting) and during power outages (providing emergency illumination). The inverter converts DC from the battery to AC for compatibility with standard LED fixtures, achieving both simplicity and reliability
Solution Approach 2:
The patent merges the emergency lighting function with the existing lighting fixture system. By integrating the battery, inverter, and control unit with the LED fixture, the system provides both normal and emergency lighting through a unified design, maintaining ease of operation while ensuring emergency availability
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 precise luminous flux determination and service time labeling, enhances user convenience, and reduces installation costs while ensuring safety by maintaining a consistent output current.
Implementation Method 1
The voltage boost circuit is electrically connected to a pulse width modulator which is electrically connected to the light source. After a voltage of the battery being boosted by the voltage boost circuit, a direct current (DC) is converted into an alternating current (AC)
Implementation Method 2
After a voltage of the battery being boosted by the voltage boost circuit, a direct current (DC) is converted into an alternating current (AC) by the pulse width modulator and then transmitted to the light source
Implementation Method 3
The light source is a light emitting diode (LED) module provided with a plurality of light emitting diodes (LEDs)
Data Source
AI summary
An emergency lighting device with an auto-dimming detection function and used in an inverter system is provided. After receiving sensing signals from a sensor, a control unit of an emergency lighting device outputs signals for control of a dimmer to carry out dimming of a light source and control output power. No matter how many light emitting diodes are mounted in a light emitting diode module of the light source, a battery is further controlled to maintain a fixed output current by control of light brightness of the light source. Thereby not only luminous flux of the light source can be calculated accurately, use and arrangement of the emergency lighting device are easier. Installation cost is significantly reduced and manufacturers can label service time of the device accurately. The emergency lighting device is safer and more convenient to use.