LED Switching Mechanism with Kinetic Energy Absorption
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Solution Overview
Problem
Mechanical switches used to switch on LEDs experience bouncing and arcing due to inefficient dissipation of kinetic energy, leading to accelerated contact aging or welding, particularly exacerbated by high inrush currents during LED lamp activation.
Innovation Solution
Incorporating a body behind the fixed electrode to absorb and dissipate the kinetic energy of the moving electrode, utilizing materials like polymers, elastomers, foams, or springs to prevent bouncing and arcing, with designs such as flexible sections, loops, or corrugated current carriers to effectively dampen the energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mechanical switch is used to switch on LED, then the LED can be controlled, but bouncing and arcing occur due to kinetic energy not being dissipated efficiently
Solution Approach 1:
A body made of energy-absorbing material (such as rubber, plastic, or composite material) is positioned behind the fixed contact to absorb the kinetic energy of the moving electrode before impact occurs. This cushioning body prevents bouncing by dissipating the kinetic energy through deformation, thereby eliminating the conditions that lead to arcing and contact damage.
2Device complexity
If the kinetic energy of the moving electrode is not dissipated efficiently, then the switch structure remains simple, but bouncing occurs during closing phase
Solution Approach 1:
An intermediary body made of energy-absorbing material is introduced between the moving electrode and the fixed contact. This intermediary absorbs the kinetic energy through deformation, preventing direct elastic collision and bouncing. The material is selected to provide adequate damping while maintaining electrical insulation properties.
3Productivity
If high inrush current flows during LED switching, then LED can be powered on, but contact ageing accelerates or welding occurs
Solution Approach 1:
The cushioning body is positioned to absorb kinetic energy before the moving electrode impacts the fixed contact during the high inrush current phase. By preventing bouncing and arc formation at the moment of highest current stress, the contact surfaces are protected from accelerated aging and welding, extending the switch lifespan while maintaining LED switching 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
Prevents bouncing and arcing in mechanical switches, ensuring reliable operation and compliance with international standards for low-voltage applications by efficiently managing high inrush currents in LED switching scenarios.
Implementation Method 1
the body is a flexible section of a current carrier or wherein the body is a flexible current carrier. In order to absorb the kinetic energy a holder of the fixed electrode is designed as a loop, an arch or a bent design of the current carrier directly behind the contact or electrode. By correct dimensioning of the flexible section, this acts as a dampened spring and can absorb and dissipate the energy of the impact
Implementation Method 2
the body comprises a polymer or is a polymer. Polymeric materials can provide an efficient damping of a moving electrode. the body comprises an elastomer or is an elastomer. Elastomeric materials, which can be used to develop the body, are e.g. natural rubber, synthetic rubber or thermoplastic elastomers
Implementation Method 3
the body comprises a foam or is developed as a foam. Foam or foam-like materials can be used to develop the body. In particular, a metallic foam, a ceramic foam, a composite foam or a polymer foam could be used
Data Source
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AI summary
An apparatus (1, 1a, 1b) to switch a light emitting diode (LED) or another load, comprising a mechanical switch (2), which comprises a moving electrode (3), wherein the moving electrode (3) is a contact, which electrically gets in connection with a further contact or electrode (4) to enable a current flow while a closing phase, characterized in that the apparatus (1, 1a, 1b) comprises a body (5, 5a, 5b) which absorbs or dissipates the kinetic energy of the moving electrode (3), achieves the object to prevent bounces or arcs of electrodes, especially to prevent bounces or arcs of a moving electrode of a mechanical switch.