Linear LED Driver with Anti-Shock Module for Ballast Compatibility
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Solution Overview
Problem
Conventional LED drivers for linear LED lamps face challenges with compatibility and safety when operating with ballasts, leading to inefficiencies, high maintenance costs, and electric shock hazards, particularly in retrofitting fluorescent lamp fixtures.
Innovation Solution
A novel LED driving circuit with a front-end and rear-end module, anti-electric-shock module, and switch control module that converts AC voltage into DC voltage, ensuring safe operation with both ballasts and AC mains in double-ended and single-ended configurations, using diodes, capacitors, and electronic switches to manage current flow and prevent electric shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a ballast-compatible LED driver is used to operate with existing ballasts, then compatibility with existing fixtures is improved, but electric shock hazards and safety risks worsen
Solution Approach 1:
The patent introduces an isolation transformer as an intermediary device between the ballast-compatible LED driver and the AC mains. This transformer provides galvanic isolation, blocking the transmission of electric shock hazards while maintaining power transfer. The transformer acts as a safety mediator that preserves compatibility functionality without exposing users to electrical dangers.
Solution Approach 2:
The patent employs fuse components that are designed to fail safely by breaking the circuit when abnormal conditions occur. These protective components are relatively simple and can be replaced inexpensively, providing a cost-effective safety mechanism that prevents catastrophic failures while maintaining system compatibility.
2Ease of manufacture
If a ballast-compatible LED driver is used, then initial installation cost is reduced, but long-term maintenance costs and energy consumption worsen
Solution Approach 1:
The patent implements a smart control system that automatically detects whether a ballast is present in the fixture and adapts its operation accordingly. When no ballast is detected, the system switches to direct AC mains operation, eliminating the ballast's constant power draw. This self-service capability allows the system to optimize energy consumption based on actual installation conditions without requiring user intervention.
Solution Approach 2:
The patent employs a dynamic operating mode that can switch between ballast-compatible mode and direct AC mains mode. The system continuously monitors circuit conditions and adjusts its power conversion strategy accordingly, transitioning from a static design to a dynamic one that optimizes energy efficiency based on real-time operational context.
3Device complexity
If conventional LED drivers without multiple switches are used, then device complexity is reduced, but adaptability to different power sources and configurations worsens
Solution Approach 1:
The patent designs a universal LED driver that can operate with multiple power sources (ballasts and AC mains) and in multiple configurations (single-ended and double-ended). By integrating multiple switches and control circuits, the driver achieves multi-functionality, adapting to different power sources and fixture types without requiring separate dedicated drivers for each application.
Solution Approach 2:
The patent divides the control function into multiple independent switches (first switch, second switch, third switch) that can be independently controlled. This segmentation allows the system to selectively activate different operational modes based on detected conditions, enabling adaptability while maintaining modular control architecture that manages complexity through functional division.
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
Enables efficient, safe, and cost-effective operation of linear LED lamps with existing ballasts and AC mains, reducing maintenance costs and eliminating electric shock hazards during installation and re-lamping, while supporting dual-mode operation without flickering or power failures.
Implementation Method 1
converts AC voltage into DC voltage, ensuring safe operation with both ballasts and AC mains
Implementation Method 2
using diodes, capacitors, and electronic switches to manage current flow
Implementation Method 3
anti-electric-shock module, and switch control module that converts AC voltage into DC voltage, ensuring safe operation
Data Source
AI summary
A linear light-emitting diode (LED) lamp (LL lamp) comprising a front-end module, an LED driving circuit operable with a ballast and alternate current (AC) mains, an anti-electric-shock module, and a switch control module operates with the AC mains in a single end and double ends and with the ballast in the double ends without any risk of electric shock. Besides, the LL lamp passes an industry required electric shock test when an input AC voltage from a testing ballast is applied in the double ends. Whereas both the front-end module and the switch control module are coupled to a first ground reference, the LED driving circuit is coupled to a second ground reference. When the input AC voltage from the ballast is applied, the switch control module is enabled to couple the second ground reference to the first ground reference, allowing a current returned to operate the LL lamp.