LED Lamp Tube Protection Circuit With Capacitive False-Trigger Suppression
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Solution Overview
Problem
LED lamp tubes often mistakenly trigger electric shock protection circuits when connected in parallel, leading to disconnection from the power grid and failure to operate normally, due to variations in wire lengths and sizes.
Innovation Solution
Incorporating a capacitive component that connects one end to the live wire input end and the other end to the neutral wire input end, which discharges the current sampling point of the electric shock protection circuit, preventing false triggering and allowing normal operation of LED lamp tubes connected in parallel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple LED lamp tubes are connected in parallel to extend lighting coverage, then illumination area is improved, but the electric shock protection circuit is mistakenly triggered, preventing normal operation
Solution Approach 1:
The capacitor serves as an intermediary that enables parallel connections to work properly. By being connected in parallel with the protection circuit, it provides a discharge path that prevents the protection circuit from mistakenly detecting parallel connections as safety hazards. This allows multiple lamp tubes to be connected in parallel to extend illumination area without triggering false protection responses.
2Reliability
If the electric shock protection circuit immediately disconnects the lamp tube upon triggering, then user safety is improved, but normal operation is interrupted due to mistaken triggering
Solution Approach 1:
The patent implements a feedback mechanism through the capacitor's discharge behavior. When the protection circuit triggers, the capacitor's discharge characteristics provide feedback information about the actual circuit condition. This feedback allows the system to distinguish between genuine safety threats requiring immediate disconnection and false triggers that should not interrupt operation, thereby maintaining continuous operation while preserving safety protection.
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 effectively prevents the electric shock protection circuits from mistakenly triggering when LED lamp tubes are connected in parallel, ensuring they can operate normally while still providing protection when a human body resistance is detected, and is applicable to various LED lighting devices, achieving energy-saving and comprehensive application.
Implementation Method 1
One embodiment of the present invention provides a power system capable of preventing from mistakenly triggering an electric shock protection function of a lamp tube, which includes a live wire input end, a neutral wire input end and a capacitive component
Data Source
AI summary
A power system capable of preventing from mistakenly triggering an electric shock protection function of a lamp tube and the method thereof is provided. The power system includes a live wire input end, a neutral wire input end and a capacitive component. The live wire input end is connected to a first node; the first node is used to connect to the live wire terminal of the electric shock protection circuit of a first light-emitting module. The neutral wire input end is connected to a second node; the second node is used to connect to the neutral wire terminal of the electric shock protection circuit of the first light-emitting module. One end of the capacitive component is connected to the first node and the other end thereof is connected to the second node.