LED Tube Lamp Ballast Interface Circuit and Heat Dissipation
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Solution Overview
Problem
Current LED tube lamps face issues with inefficient heat dissipation, structural weakness, risk of electric shock, compatibility with different driving signals, and manufacturing defects, particularly in adapting to emergency lighting scenarios and complying with certification standards.
Innovation Solution
The LED tube lamp design incorporates a rectifying circuit, filtering circuit, and a ballast interface circuit with a detection and switching mechanism to adapt to various driving signals, including DC signals, while using a reinforcing structure for improved heat dissipation and structural integrity, and a diffusing layer for enhanced illumination and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If metallic elements are exposed outside plastic tubes for heat dissipation, then heat dissipation efficiency is improved, but the risk of electric shock increases
Solution Approach 1:
The patent introduces an insulating structure as an intermediary between the metallic heat dissipation elements and the external environment. This mediator allows heat to be dissipated effectively while preventing direct contact that would cause electric shock, thus resolving the contradiction between heat dissipation efficiency and safety.
2Object-affected harmful factors
If metallic elements are disposed inside plastic tubes for heat dissipation, then electric shock risk is reduced, but heat dissipation efficiency decreases and plastic tube deformation occurs
Solution Approach 1:
The patent segments the heat dissipation system into distinct functional zones: metallic elements for active heat dissipation, insulating structures for safety and thermal management, and support structures for mechanical stability. This segmentation allows each component to perform its specific function optimally without interfering with others, resolving the heat dissipation versus safety contradiction.
3Temperature
If aluminum is used for metallic heat dissipation elements, then heat dissipation capability is improved, but structural strength to support plastic tubes is insufficient
Solution Approach 1:
The patent employs composite material structures combining aluminum (or other metals) with reinforcing materials or composite constructions. This creates a hybrid material system that retains the excellent heat dissipation properties of aluminum while gaining the structural strength needed to support plastic tubes, thus resolving the contradiction between heat dissipation capability and structural strength.
4Adaptability or versatility
If LED tube lamps use electronic components for ballast compatibility, then adaptability to different driving signals is improved, but compliance with EMI and safety certification standards becomes difficult
Solution Approach 1:
The patent designs a universal ballast interface circuit that can accommodate multiple ballast types (electronic, magnetic, emergency) through a single unified architecture. This multi-functional design includes detection circuits that automatically identify the ballast type and adjust operating parameters accordingly, enabling compliance with various certification standards while maintaining broad adaptability to different driving signals.
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 enables efficient heat dissipation, reduces the risk of electric shock, ensures compatibility with different driving environments, and provides reliable emergency lighting, while meeting certification standards through improved structural strength and adaptive circuitry.
Implementation Method 1
a rectifying circuit, configured to rectify the external driving signal to produce a rectified signal
Implementation Method 2
a filtering circuit coupled to the rectifying circuit and configured to filter the rectified signal to produce a filtered signal
Implementation Method 3
an LED module coupled to the filtering circuit and configured to receive the filtered signal for emitting light
Data Source
AI summary
A light emitting diode (LED) tube lamp includes: a lamp tube, for receiving an external driving signal, a rectifying circuit, a filtering circuit, and an LED module coupled to the filtering circuit and configured to receive a filtered signal for emitting light, wherein the LED module comprises an LED unit, a current-limiting element for receiving the external driving signal, the current-limiting element coupled to one or more of the external connection terminals, and coupled to or in the rectifying circuit, and a ballast interface circuit coupled to the current-limiting element and having a first terminal and a second terminal, for the LED tube lamp to be compatible with a ballast providing the external driving signal, wherein the ballast interface circuit comprises a detection circuit and a switching circuit coupled to the detection circuit, and the ballast interface circuit is configured to detect whether the external driving signal comes from a ballast, and to conduct or cut off the switching circuit based on a result of the detection. The detection circuit is configured such that, when the external driving signal is from a ballast and is being input to the LED tube lamp, the detection circuit conducts the switching circuit according to a state of a property of a detection signal transmitted through the first terminal and the second terminal.