Safety Endcap Assembly with Movable Switch for LED Arcing Prevention
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Solution Overview
Problem
LED lamps experience overheating and arcing issues due to unexpected interactions between safety mechanisms and luminaire fixtures, leading to melting and fire hazards, despite being designed to avoid conductor gaps.
Innovation Solution
A safety endcap assembly with a moveable switch button and spring mechanisms that disconnect the contact element from the LEDs when the risk of arcing increases, ensuring safe user operation and preventing electrical connections that could cause arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a safety mechanism is added to disconnect conductors during installation, then user safety is improved, but the pressure on the fixture increases causing gap formation and arcing
Solution Approach 1:
The endcap cover element is designed to be movable relative to the endcap base element along the longitudinal axis, transitioning between retracted and protracted positions. This dynamic structure allows the safety mechanism to adapt to fixture deformation over time, maintaining proper contact between connector pins and the circuit board while still providing safety disconnection functionality when needed.
Solution Approach 2:
The switch opening mechanism is configured to automatically disconnect the contact element from LEDs when the endcap cover element moves beyond a predetermined distance, before arcing can occur. This preliminary protective action prevents the harmful effect rather than merely responding to it after occurrence.
2Reliability
If the endcap cover element is kept retracted to maintain contact, then electrical connection is improved, but the safety disconnection function cannot be activated
Solution Approach 1:
The switch opening mechanism automatically activates the safety disconnection function when needed, without requiring manual intervention. The mechanism monitors the position of the endcap cover element and autonomously opens the switch when the cover moves beyond the predetermined distance, ensuring both continuous contact maintenance and automatic safety disconnection.
3Productivity
If the switch remains closed to maintain LED connection, then lighting function is improved, but the risk of overheating and fire increases
Solution Approach 1:
The switch opening mechanism provides feedback-based control by monitoring the position of the endcap cover element. When the cover moves beyond the predetermined distance indicating potential arcing risk, the mechanism automatically opens the switch to disconnect power, preventing overheating and fire hazards while maintaining lighting function under normal operating conditions.
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
The solution effectively reduces the risk of arcing and associated hazards by ensuring the contact element is disconnected before arcing occurs, enhancing user safety and preventing overheating and fire risks in LED lamps.
Implementation Method 1
a first spring mechanism for urging the endcap cover element towards the protracted position
Implementation Method 2
a contact element (which preferably extends along the same axis as the connector pin) for electrically connecting the connector pin to the LEDs
Implementation Method 3
Arcing, or arc discharge, is an electrical breakdown of a gas that produces an ongoing electrical discharge
Data Source
Figure 1~2C
Figure 3A~3B
Figure 3C~3D
AI summary
A safety endcap assembly (25, 200) to be arranged at an end of an LED lamp (1). It has an endcap base element (201), an endcap cover element (203), a connector pin (205, 207), a contact element (217, 219) for connecting to the connector pin (205, 207) to LEDs, and a switch button (213). The endcap cover element (203) is moveable between a protracted position and a retracted position, and the switch button (213) is moveable between a first position and a second position. The switch button (213) is arranged to disconnect contact element (217, 219) from the LEDs when the switch button (213) is in the first position. The safety endcap assembly further has a switch opening mechanism configured to move the switch button to the first position when a certain condition is met.