LED Tube Lamp Installation Detection Module Safety Circuit
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Solution Overview
Problem
Existing LED tube lamps face issues such as false usability due to rigid circuit boards, electrical shock risks, and compatibility challenges with traditional fluorescent lighting systems, particularly regarding electromagnetic interference and safety standards, as well as differing voltage and frequency requirements.
Innovation Solution
The implementation of an installation detection module within the LED tube lamp that includes a detection pulse generating module, a detection result latching circuit, and a switch circuit to determine the installation state and maintain a conductive power loop, ensuring safe operation and compliance with certification standards by generating pulse signals and sampling signals to assess the lamp's installation state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid circuit board is used in the LED tube lamp, then the structural stability is improved, but it creates a false impression of usability when the lamp is broken and increases electrical shock risk
Solution Approach 1:
The patent replaces the rigid circuit board with a flexible circuit board that can dynamically change its shape. When the LED tube lamp is broken or removed, the flexible circuit board automatically bends or deforms, providing a visible and tactile indication that the lamp is not usable, thereby eliminating the false impression of usability while maintaining structural stability during normal operation.
Solution Approach 2:
The patent uses a flexible circuit board instead of a rigid one. The flexible nature of the circuit board allows it to bend and deform when the lamp is broken or removed, providing a clear visual and tactile signal that the lamp is not functional. This resolves the contradiction by maintaining structural integrity during use while providing accurate safety indication when broken.
2Reliability
If LED tube lamps are designed with electronic components to meet safety standards, then safety and EMI compliance are improved, but compatibility with traditional fluorescent lighting systems deteriorates due to different voltage and frequency requirements
Solution Approach 1:
The patent incorporates an adaptive driver circuit that can detect and adapt to different input voltage and frequency parameters. This allows the LED tube lamp to maintain safety compliance through proper electronic component design while simultaneously achieving compatibility with traditional fluorescent lighting systems by adjusting its electrical parameters to match the existing infrastructure.
Solution Approach 2:
The patent designs the LED tube lamp with a universal driver circuit that can operate with both traditional fluorescent ballasts and modern LED drivers. This multi-functional approach allows the lamp to meet safety standards through proper electronic component selection while maintaining broad compatibility with different lighting systems, resolving the contradiction between safety compliance and system adaptability.
3Reliability
If an installation detection module is added to detect installation state, then user safety is improved by preventing electrical shocks, but device complexity increases
Solution Approach 1:
The patent integrates the installation detection functionality into the existing flexible circuit board structure. The detection module shares common components and pathways with the main lighting circuit, combining multiple functions into a unified design. This approach improves user safety through automatic detection while minimizing the increase in device complexity by avoiding separate, redundant systems.
Data Source
AI summary
An LED tube lamp is provided herein, which implements the safety function for protecting the user from electric shock since it conducts only when both ends thereof have been correctly installed into a lamp socket. The LED tube lamp includes an installation detection module configured in the LED tube lamp to detect an installation state between the LED tube lamp and the lamp socket. The installation detection module includes: a detection pulse generating module, configured to generate a first pulse signal; a detection result latching circuit, configured to receive and output the first pulse signal; a switch circuit, configured to receive the first pulse signal from the detection result latching circuit, and configured to maintain a conductive state of the switch circuit during the first pulse to cause a power loop of the LED tube lamp to be conductive; and a detection determining circuit, configured to detect a first sampling signal on the power loop so as to determine the installation state between the LED tube lamp and the lamp socket.