Lighting Driver Optical Fiber Indicator for EMC Compliance
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Solution Overview
Problem
Emergency lighting systems face EMC and transient issues due to long wire connections between status indicator LEDs and test switches, complicating design and limiting compliance with noise standards.
Innovation Solution
A driver with a printed circuit board (PCB) mounted status indicator LED and an optical fiber arrangement that delivers light to a PCB-mounted light sensor and test button, using a flexible fibre-optic cable to replace traditional leaded indicators and implement optical feedback, thereby avoiding noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If long wire connections are used between status indicator LED and test switch, then ease of operation is improved, but EMC compliance deteriorates due to noise induction
Solution Approach 1:
The patent replaces electrical wire connections with optical fiber connections to transmit signals between the test button and driver circuitry. This substitution of mechanical/electrical coupling with optical coupling eliminates the antenna effect that causes EMC issues while maintaining the functional connectivity needed for operation.
Solution Approach 2:
The patent introduces optical fiber as an intermediary medium to transmit control signals and status indicators between the user interface elements and the driver circuitry. This intermediary optical transmission path isolates the electrical circuits from each other, preventing noise induction while allowing signal passage.
2Ease of manufacture
If long wire connections are used between status indicator LED and test switch, then ease of manufacture is improved, but device complexity increases due to EMC filtering requirements
Solution Approach 1:
The patent replaces electrical wire connections with optical fiber connections to transmit signals between the test button and driver circuitry. This substitution of mechanical/electrical coupling with optical coupling eliminates the antenna effect that causes EMC issues while maintaining the functional connectivity needed for operation.
Solution Approach 2:
The patent introduces optical fiber as an intermediary medium to transmit control signals and status indicators between the user interface elements and the driver circuitry. This intermediary optical transmission path isolates the electrical circuits from each other, preventing noise induction while allowing signal passage.
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
This solution simplifies design and development by using non-conductive optical fibers, ensuring compliance with EMC standards and reducing noise issues, while allowing flexible routing and positioning of status indicators.
Implementation Method 1
an optical fiber arrangement configured to deliver light emitted by the status indicator LED at a light sensor
Data Source
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AI summary
Disclosed is a driver (1) for a light source (25), including a printed circuit board, PCB (11); a status indicator LED (111) preferably directly mounted on the PCB (11); and an optical fiber arrangement (23A; 23B) configured to deliver light emitted by the LED (111) at a light sensor (112) preferably directly mounted on the PCB (11) and connected to a control circuitry of the driver (1). This avoids EMC and transient issues in connection with remotely arranged status indicator LEDs and emergency test buttons.