LED Tube Lamp Power Module With Ballast Detection And Protection
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Solution Overview
Problem
Existing LED tube lamps face issues with compatibility with traditional ballasts, leading to overvoltage, overcurrent, and electrical shock risks due to their rigid circuit boards and lack of advanced current regulation, as well as difficulties in complying with electromagnetic interference and safety standards.
Innovation Solution
The design incorporates a flexible LED tube lamp with a bendable circuit sheet, a rectifying circuit, a filtering circuit, and a protection circuit that includes a voltage divider and control circuit to regulate current flow and prevent overcurrent conditions, along with a detection circuit to ensure compatibility with various ballasts and enhance safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LED tube lamps use traditional rigid circuit boards, then manufacturing is simpler, but compatibility with ballasts deteriorates and safety risks increase
Solution Approach 1:
The patent employs a dynamic detection circuit that actively monitors electrical parameters and adapts its operation based on detected conditions. The circuit dynamically switches between different operational modes (normal operation, overvoltage protection, overcurrent protection) based on real-time detection, enabling compatibility with various ballast types while maintaining safety.
Solution Approach 2:
The invention changes electrical parameters through its detection and protection circuits. It detects voltage and current parameters, and when abnormal conditions are detected, it modifies the electrical parameters by disconnecting or limiting current flow, thereby achieving both compatibility with different ballasts and protection against unsafe conditions.
2Device complexity
If LED tube lamps lack advanced current regulation, then device complexity is reduced, but overvoltage and overcurrent protection deteriorates
Solution Approach 1:
The detection circuit performs preliminary detection of electrical conditions before dangerous overvoltage or overcurrent situations can damage the LED tube lamp. By detecting abnormal conditions in advance and activating protection mechanisms proactively, the system ensures reliability without requiring complex real-time intervention circuits.
Solution Approach 2:
The invention implements a feedback mechanism where the detection circuit continuously monitors electrical parameters and provides feedback to the protection circuit. When abnormal conditions are detected, the feedback triggers the protection circuit to activate, creating a closed-loop system that ensures electrical safety through intelligent monitoring and response.
3Ease of manufacture
If LED tube lamps use simple power supply modules, then manufacturing cost is reduced, but compliance with safety standards deteriorates
Solution Approach 1:
The power supply module integrates multiple functions into a single compact unit: rectification, filtering, voltage detection, current detection, and protection activation. This multi-functional design achieves safety standard compliance through comprehensive protection capabilities while maintaining ease of manufacture by using an integrated module rather than separate discrete components.
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 enhanced electrical safety, improved compatibility with different ballasts, and compliance with safety standards by regulating current flow and preventing overvoltage and overcurrent conditions, thus ensuring stable and safe operation of the LED tube lamp.
Implementation Method 1
a rectifying circuit, a filtering circuit and a protection circuit
Implementation Method 2
a rectifying circuit, a filtering circuit and a protection circuit
Data Source
AI summary
An LED tube lamp with overvoltage protection capability is provided. The LED tube lamp includes a lamp tube, two external connection terminals, a rectifying circuit, a filtering circuit, an LED module, and a protection circuit. The protection circuit is coupled between two input terminals of the LED module and configured to perform overvoltage protection when determining that a voltage level between the two input terminals of the LED module reaches or is higher than a predefined voltage value, wherein the protection circuit includes a diode and the predefined voltage value is in a range of about 40V to about 600V.