LED Surge Protection Circuit With Inductive Energy Release
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Solution Overview
Problem
Traditional surge protection circuits, such as those using varistors, face issues with aging and increased leakage current, leading to reduced effectiveness in protecting LED tube lamps from electrical surges, and Type-B LED tube lamps with dual-end power supply structures pose a higher risk of electric shock due to high-frequency voltage differences.
Innovation Solution
A surge protection circuit incorporating an inductor and a voltage-controlled component in parallel, which temporarily stores and releases surge energy, and an electric-shock detection module to limit current during improper installation, ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a varistor is used for surge protection, then surge energy can be released to protect electronic components, but leakage current increases and aging occurs reducing protection effectiveness
Solution Approach 1:
The patent introduces an inductor as an intermediary component between the varistor and the power line. The inductor limits the leakage current flowing through the varistor during normal operation, thereby reducing the aging effect and maintaining the varistor's protection capability over time, while still allowing surge energy to be released when needed
2Shape
If a rigid circuit board is used in LED tube lamps, then the lamp maintains a straight tube configuration, but it gives a false impression of usability when partially ruptured causing electric shock risk
Solution Approach 1:
The patent replaces the rigid circuit board with a flexible circuit sheet that can bend and deform when the lamp tube is ruptured. This flexibility allows the circuit to naturally disconnect or short-circuit when damaged, giving a visible indication of failure and preventing the false impression of usability, thereby reducing electric shock risk while maintaining the straight tube configuration during normal operation
3Reliability
If electronic components are added to LED tube lamps for surge protection and shock detection, then safety and reliability are improved, but device complexity increases making certification difficult
Solution Approach 1:
The patent designs the circuit components to serve multiple functions. The inductor not only limits leakage current but also plays a role in the surge protection circuit. The flexible circuit sheet provides both structural flexibility and electrical connection functions. The shock detection mechanism utilizes existing circuit elements rather than adding separate dedicated components, thereby improving safety while minimizing the increase in device complexity for certification purposes
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 effectively reduces the risk of electric shock and enhances the reliability of LED tube lamps by managing surge energy and detecting improper installation, thereby meeting stringent safety certification standards.
Implementation Method 1
A surge protection circuit incorporating an inductor and a voltage-controlled component in parallel, which temporarily stores and releases surge energy
Implementation Method 2
The energy-releasing circuit is connected in parallel with the inductive circuit, and is configured to release the surge energy, preventing the surge energy from affecting later-stage circuit(s)
Data Source
AI summary
The present disclosure presents a surge protection circuit, and a power supply device and an LED lighting device both applying the surge protection circuit. The surge protection circuit includes an inductive circuit and an energy-releasing circuit. The inductive circuit is coupled to a power loop for a load, and is configured to receive and temporarily store surge energy in the power loop. The energy-releasing circuit is connected in parallel with the inductive circuit, and is configured to release the surge energy for preventing the surge energy from affecting later-stage circuit(s).