LED Converter Safe Operating Mode for Fault Illumination
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Solution Overview
Problem
LED converters in lighting systems shut down completely when faults occur, leading to a loss of light output and making it difficult for customers to identify the fault, as existing solutions switch off the converter or enter a standby mode without providing any illumination or diagnostic signals.
Innovation Solution
Implementing a safe operating mode that allows the LED converter to continue operating and providing reduced light output even when faults are present, enabling continued illumination and signaling to the customer of abnormal conditions through adjusted light levels or patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the LED converter switches off completely or enters standby mode when a fault condition is detected, then component damage is prevented, but light output is completely lost and fault identification becomes difficult
Solution Approach 1:
The patent segments the fault response into two distinct modes: a first operating mode for normal operation and a second operating mode (safe operating mode) for fault conditions. This segmentation allows the system to maintain differentiated behavior - complete shutdown for severe faults while enabling reduced-power operation for less critical faults, thus preserving light output when safe to do so while protecting components when necessary.
Solution Approach 2:
The system dynamically transitions between operating modes based on fault severity assessment. The control unit evaluates the detected fault condition and dynamically switches between the first operating mode (normal light output) and the second operating mode (reduced light output with fault indication), allowing adaptive response that balances component protection with continued illumination needs.
2Reliability
If the LED converter switches off completely when a fault condition is detected, then component damage is prevented, but customer service and fault identification are hindered
Solution Approach 1:
The patent uses light output modification as a visual signal - in the second operating mode, the LED converter continues to emit light at a reduced level or in a different pattern to indicate fault presence. This allows customers to immediately identify that a fault exists without requiring specialized diagnostic equipment, as the abnormal light output itself serves as the diagnostic indicator.
Solution Approach 2:
The system provides immediate visual feedback about fault conditions through modified light output in the second operating mode. Instead of silent shutdown, the converter communicates its fault state to the user through the light emission pattern, enabling intuitive fault identification and facilitating faster customer service response.
3Illumination intensity
If the LED converter operates in safe operating mode with reduced light output, then continued illumination is provided and fault signaling is achieved, but the flexibility of operation is reduced
Solution Approach 1:
The patent implements partial operation in the second operating mode - the LED converter continues to provide illumination at a reduced level rather than shutting down completely. This partial action allows the system to maintain essential functionality (lighting) while accepting reduced performance, which is acceptable for non-critical faults where continued operation provides more value than complete shutdown.
Data Source
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AI summary
A method for operating an LED converter (1) which is connected to a power supply via a mains input (10) and to an LED light source (50) via a load connection (30) is provided, wherein the method comprises: determining, by the LED converter (1), whether a fault condition occurs during operation of the LED converter (1); in case a fault condition is determined, operating the LED converter (1) in a safe operating mode.