LED Tube Lamp Ballast Interface Circuit Compatibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing LED tube lamps face issues with compatibility with electronic ballasts due to their nonlinear characteristics, leading to compatibility problems, electrical shock risks, and instability in lighting due to overvoltage or undercurrent issues, and they lack flexibility to adapt to different lighting configurations.
Innovation Solution
The development of an LED tube lamp with a bendable circuit sheet and a ballast interface circuit that initially prevents light emission until it enters a conduction state, allowing current flow, along with a rectifying and filtering circuit to ensure compatibility with traditional driving systems, enhancing safety and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid circuit board is used to maintain straight tube configuration, then structural stability is improved, but safety deteriorates due to false impression of usability after rupture and electrical shock risk
Solution Approach 1:
The patent replaces the rigid circuit board with a flexible circuit board that can dynamically change its configuration. When the lamp tube is intact, the flexible circuit board maintains a straight configuration for stability. When the lamp tube is ruptured, the flexible circuit board naturally bends or deforms, providing a visible indication of damage and preventing false impressions of usability, thereby eliminating the electrical shock risk associated with rigid boards that maintain their shape after rupture.
2Ease of manufacture
If wire bonding is used to electrically connect circuit board with end caps, then ease of manufacture is improved, but reliability deteriorates due to easy damage and breakage of wires
Solution Approach 1:
The patent replaces the mechanical wire bonding system with a direct electrical connection system where the flexible circuit board is directly connected to the end caps without intermediate wires. This substitution eliminates the vulnerable wire component that is prone to damage and breakage during manufacturing, transportation, and usage, while maintaining ease of manufacture through simplified connection processes.
3Device complexity
If traditional LED driving circuit is used, then compatibility with fluorescent lamp ballast deteriorates, but device complexity is reduced
Solution Approach 1:
The patent designs an LED driving circuit with universal adaptability that can work with traditional fluorescent lamp ballasts. The circuit incorporates detection functionality to identify ballast presence and automatically adjusts its operation mode accordingly, enabling the same circuit design to serve both LED-specific applications and legacy fluorescent ballast systems, thereby achieving multi-functionality without significantly increasing device complexity.
4Adaptability or versatility
If electronic components are added to improve ballast compatibility, then adaptability is improved, but electromagnetic interference increases making certification difficult
Solution Approach 1:
The patent introduces electromagnetic interference filtering circuits as intermediary components between the LED driving circuit and the external environment. These filtering circuits act as mediators that allow the LED circuit to maintain compatibility with fluorescent ballasts while blocking or reducing electromagnetic interference emissions, enabling the system to meet EMI certification standards without sacrificing adaptability.
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 improved safety by preventing electrical shock, ensures compatibility with electronic ballasts, and stabilizes lighting output, addressing the issues of rigidity and compatibility in existing LED tube lamps.
Implementation Method 1
a first rectifying circuit coupled to the first external connection terminal and the second external connection terminal and configured to rectify the external driving signal to produce a rectified signal
Implementation Method 2
a filtering circuit coupled to the first rectifying circuit and configured to filter the rectified signal to produce a filtered signal
Implementation Method 3
an LED lighting module coupled to the filtering circuit and configured to receive the filtered signal for emitting light
Data Source
AI summary
An LED tube lamp includes a lamp tube, a first external connection terminal and a second external connection terminal coupled to the lamp tube and for receiving an external driving signal; an LED lighting module coupled to the first external connection terminal and configured to receive a signal for emitting light, the signal derived from the first external driving signal; and a ballast interface circuit coupled between the first external connection terminal and the LED lighting module. The ballast interface circuit may be configured such that when the external driving signal is initially input at the first external connection terminal and second external connection terminal, the ballast interface circuit will initially be in an open-circuit state, which prevents the LED tube lamp from emitting light, until the ballast interface circuit enters a conduction state, which conduction state allows a current input at the first external connection terminal/second external connection terminal to flow through the LED lighting module and thereby allows the LED tube lamp to emit light.