Parallel LED Test Switch for Emergency Lighting
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Solution Overview
Problem
Emergency lighting systems require a complex arrangement of external connections for test switches and status displays, leading to increased space and wiring requirements, as well as higher installation costs due to the need for multiple external connections.
Innovation Solution
An operating device with a reduced number of external connections is achieved by connecting a test switch in parallel with two light-emitting diodes, allowing for a single pair of connections to serve both test and status functions, utilizing a constant current source and control circuit to manage the LEDs and detect short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate connections are provided for test switch and status LEDs, then test functionality and status display can be independently implemented, but the number of external connections increases to six
Solution Approach 1:
The patent combines the test switch connection and status LED connections into a single shared connection pair. The test switch and two LEDs (green and red) are all connected between the same first and second external connection terminals, eliminating the need for separate connection pairs for each function.
Solution Approach 2:
The shared connection pair serves multiple functions simultaneously: it provides the test switch connection for initiating function tests and also serves as the connection path for both the green status LED and red fault LED to display system status externally.
2Adaptability or versatility
If six external connections are provided for operating device, then all test and status functions can be implemented, but housing space requirements and installation wiring effort increase
Solution Approach 1:
The patent merges the previously separate connection pairs into a single shared connection pair, reducing the number of external connection terminals from six to two. This consolidation maintains all necessary functions while significantly reducing the space required for connection terminals in the housing.
3Reliability
If six external connections are required, then complete test and status functionality is achieved, but installation costs and wiring effort increase
Solution Approach 1:
The patent combines multiple connection functions into a single shared connection infrastructure, reducing the wiring required during installation. The same two connection terminals carry signals for both test switch operation and dual-LED status indication, halving the number of external wires needed compared to the prior art.
4Ease of operation
If multiple separate connections are used for test switch and LEDs, then each component can be independently connected, but the number of connection terminals and wiring increases
Solution Approach 1:
The patent creates a universal connection pair that handles multiple functions: the test switch connects to initiate tests, the green LED connects to indicate ready status, and the red LED connects to indicate faults. All four components share the same two external connection terminals, reducing the total number of connections from six to two while maintaining independent operational capability.
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 configuration reduces the number of external connections from six to two, minimizing space and installation costs while allowing for more design flexibility and efficient logistics, while maintaining effective status display and test functionality.
Implementation Method 1
a first light-emitting diode (12) and a second light-emitting diode (13) which are connected in opposite directions in parallel between the first connection (9.1) and the second connection (9.2)
Data Source
Figure 1
Figure 2
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AI summary
The invention relates to an assembly, comprising an operating device (1) for emergency lighting, a first light-emitting diode (12), a second light-emitting diode (13), and a test switch (11), wherein the operating device (1) comprises a first connection point (9.1) and a second connection point (9.2), and the first light-emitting diode (12) and the second light-emitting diode (13) are connected in parallel between the first connection point (9.1) and the second connection point (9.2) with opposite orientation.