Double-Ended LED Lamp Switching Element for Ballast Safety
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Solution Overview
Problem
LED lamps lack the inherent protective characteristic of fluorescent lamps, which prevents electric shock during replacement, posing a safety risk when used with electronic ballast units, and existing safety solutions are not fully effective in ensuring electrical isolation.
Innovation Solution
A double-end LED lamp with a switching element and a supply device that provides electrical isolation based on the operating state of the lamp, simulating the behavior of a low-pressure discharge lamp, ensuring compatibility with electronic ballast units and maintaining safety features even in fault conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED lamps are used as direct replacement for fluorescent lamps, then energy efficiency is improved, but safety protection against electric shock deteriorates
Solution Approach 1:
A switching element is introduced as an intermediary component between the lamp terminals and the LED driver unit. This switching element acts as a mediator that automatically isolates electrical terminals during lamp replacement, preventing electric shock while allowing normal operation when the lamp is properly installed.
Solution Approach 2:
The switching element is configured to automatically activate and provide electrical isolation before the lamp replacement process is completed. This preliminary protective action ensures that voltage is disconnected from accessible terminals before a person might come into contact with them during lamp更换.
2Object-affected harmful factors
If switching elements are added to provide electrical isolation, then safety is improved, but device complexity increases
Solution Approach 1:
The switching element is designed to automatically activate and deactivate based on the installation state of the lamp, without requiring external control or user intervention. The system self-regulates the electrical isolation, reducing the need for additional control circuits or complex management mechanisms.
Solution Approach 2:
The switching element is integrated into the existing lamp structure and electrical circuitry, combining the safety function with the existing components rather than adding completely separate systems. This merging approach minimizes additional complexity while achieving the protective function.
3Object-affected harmful factors
If electrical isolation is maintained during operation, then safety is improved, but compatibility with electronic ballast units deteriorates
Solution Approach 1:
The electrical isolation provided by the switching element is dynamic rather than static. The switching element automatically changes state based on operational conditions: providing isolation during lamp replacement and conducting electricity during normal operation. This dynamic behavior enables both safety and compatibility with electronic ballast units.
Solution Approach 2:
The electrical characteristics of the lamp circuit are dynamically changed based on the installation state. When properly installed, the lamp terminals exhibit low impedance for normal operation; during replacement, the switching element changes the impedance state to provide isolation, allowing the same hardware to satisfy both safety requirements and ballast compatibility.
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 provides reliable electrical separation and increased safety by maintaining high impedance during operation and fault states, ensuring compatibility with existing electronic ballast units and preventing electric shock, thus enhancing the safety and reliability of LED lamps.
Implementation Method 1
a switching element for electrical isolation of the first lamp terminal from the LED driver unit in a second operating state
Data Source
AI summary
A double-capped LED lamp operates on an electronic ballast for a low-pressure discharge lamp. The lamp has a first lamp cap having at least one first lamp connection, a second lamp cap having at least one second lamp connection, and an LED driver unit, which is electrically coupled between the first lamp connection and the second lamp connection, for activating a plurality of LEDs on the basis of a lamp voltage supplied by the electronic ballast between the first lamp connection and the second lamp connection in a first operating state. The lamp comprises a switching element for the galvanic separation of the first lamp connection from the LED driver unit in a second operating state, and an activation device for switching at least from the second operating state into the first operating state according to the lamp voltage.