Emergency Lighting Driver With LED Battery Health Indication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing emergency lighting systems lack a reliable and efficient way to quantify the health of batteries used in emergency lighting means, relying on binary indicators that do not provide precise information about the battery's ability to meet specified duration requirements during power outages.
Innovation Solution
An emergency lighting driver with a control circuit and status indicator LED that performs duration time tests and provides quantitative information about battery health through adjustable light parameters, such as brightness or pulse-width-modulation, allowing for precise monitoring and communication of battery status.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If binary status indicator LEDs are used to indicate battery status, then the device complexity is reduced, but the measurement precision of battery health information is insufficient
Solution Approach 1:
The patent applies parameter changes by modulating the LED's light output parameters (brightness, duration, frequency) to encode quantitative battery health information. Instead of using multiple LEDs with different colors, a single LED varies its luminous intensity and temporal characteristics to represent different battery states, thereby maintaining low device complexity while achieving high measurement precision in battery health monitoring
Solution Approach 2:
The patent employs periodic action through pulse-width modulation (PWM) and flash patterns where the LED emits light in periodic pulses with varying duty cycles. The controller generates periodic test signals that cause the LED to flash at different frequencies and durations, encoding precise battery capacity information in the temporal pattern of light emission, thus providing quantitative feedback without increasing hardware complexity
2Measurement precision
If quantitative battery health information is provided through light parameter modulation, then the measurement precision is improved, but the device complexity increases due to additional control circuitry
Solution Approach 1:
The patent applies universality by making the existing status indicator LED perform multiple functions: it serves as both a simple presence indicator and a quantitative information display device. The same LED that originally only indicated battery charge status now also communicates precise battery capacity, health percentage, and operational readiness through modulated light patterns, eliminating the need for separate display components and reducing overall device complexity
Solution Approach 2:
The patent uses the LED's light output as an intermediary medium to transmit quantitative battery health information. Rather than directly displaying numerical values or using complex graphical interfaces, the system modulates the LED's luminous properties to encode information that can be perceived by humans or captured by optical sensors, creating an efficient information transmission channel that bridges the battery management system and the user or monitoring device
3Reliability
If duration time tests are performed to assess battery lifetime, then the reliability of battery status assessment is improved, but the loss of time for testing increases
Solution Approach 1:
The patent applies preliminary action by performing duration time tests periodically at scheduled intervals rather than continuously or on-demand. The controller automatically initiates tests at predetermined times (e.g., daily, weekly, or monthly cycles), allowing the battery system to maintain normal operation between tests while still providing reliable periodic assessment of battery capacity and health, thus balancing reliability with minimal operational disruption
Solution Approach 2:
The patent implements partial action by conducting shortened or reduced-load duration tests that assess battery health without requiring the battery to discharge completely or under full emergency load conditions. The controller can perform partial capacity tests that measure a portion of the battery's total capacity, providing sufficient reliability information for status assessment while significantly reducing the time required compared to complete discharge tests
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 monitoring of battery health, reducing maintenance costs by automatically indicating the need for battery replacement and providing quantitative information, even to basic systems without dual-color LEDs, thus enhancing reliability and efficiency.
Implementation Method 1
at least one status indicator LED
Implementation Method 2
the control circuit is configured to encode the quantitative information by supplying the at least one status indicator LED with a signal comprising a pulse-width-modulation (PWM)
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention relates to an emergency lighting driver (100) for supplying an emergency lighting means (108), comprising: a control circuit (104), and at least one status indicator LED (108), wherein the control circuit (104) is arranged to perform a duration time test with regard to an operation of the emergency lighting means (108) off a battery (107) connected to the emergency lighting driver (100), and issue a quantitative information of the test result via at least one light parameter of the at least one status indicator LED (109).