Solid-State Lighting Apparatus Impedance Matching Fluorescent Ballasts
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Solution Overview
Problem
Solid-state lighting systems, particularly LED-based replacements for fluorescent lamps, face challenges in mimicking the impedance of traditional fluorescent lamps to prevent ballast shutdown and ensure seamless power transfer, as existing solutions fail to accurately replicate the impedance characteristics needed for compatibility and efficient operation.
Innovation Solution
The implementation of a solid-state lighting apparatus with filament-imitating impedances, including capacitors and resistors, coupled to ballast connection ports to mimic the impedance of fluorescent lamps, along with low-frequency blocking impedances to prevent DC offset and frequency component interference, allowing for efficient power transfer and preventing unwanted shutdowns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED-based solid-state lighting is used to replace fluorescent lamps, then energy efficiency is improved and heat generation is reduced, but compatibility with existing fluorescent ballasts deteriorates due to impedance mismatch
Solution Approach 1:
The patent introduces filament-imitating impedances as intermediary components that mediate between the LED solid-state lighting circuit and the fluorescent ballast. These impedances (comprising capacitors and resistors) replicate the electrical characteristics of traditional fluorescent lamp filaments, allowing the ballast to operate correctly without modifying its design. This intermediary approach enables LED replacements to work with existing fluorescent ballasts while maintaining energy efficiency benefits.
Solution Approach 2:
The patent applies parameter changes by carefully selecting and adjusting the electrical parameters (capacitance and resistance values) of the filament-imitating impedances to match the impedance characteristics of traditional fluorescent lamp filaments across different operating conditions. This includes accounting for temperature-dependent resistance changes and frequency-dependent capacitance effects to ensure accurate impedance replication throughout the ballast's operating range.
2Adaptability or versatility
If filament-imitating impedances are added to ensure ballast compatibility, then adaptability is improved, but device complexity increases due to additional components
Solution Approach 1:
The patent segments the impedance simulation function into separate, modular components: filament-imitating impedances for each ballast connection port. Each port receives identical impedance circuitry, allowing independent optimization and simplifying manufacturing. This segmentation enables the complex impedance matching function to be broken down into manageable, standardized modules that can be easily integrated into the LED replacement lamp design.
3Reliability
If low-frequency blocking impedances are implemented to prevent DC offset interference, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the low-frequency blocking function with the existing filament-imitating impedance circuitry. The same capacitor components that provide impedance matching at operating frequencies also serve as blocking elements against DC offsets and low-frequency interference. This functional merging eliminates the need for separate blocking circuits, maintaining reliability while minimizing additional complexity.
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
This solution enables the successful integration of LED lighting systems with fluorescent lamp ballasts, ensuring stable operation and preventing premature shutdowns by accurately mimicking the impedance of traditional fluorescent lamps, thus facilitating efficient power transfer and reliable performance.
Implementation Method 1
The first and second filament-imitating impedances each comprise at least one capacitor
Implementation Method 2
each of the first and second low-frequency blocking impedances may be configured to block a DC offset, In further embodiments, each of the first and second low-frequency blocking impedances may be configured to block a nominally 60 Hz frequency component
Data Source
AI summary
A lighting apparatus includes a solid-state lighting circuit, at least one ballast connection port and at least one low-frequency blocking impedance coupling the at least one ballast connection port to the solid-state lighting circuit. In some embodiments, the at least one low-frequency blocking impedance may be configured to block a DC offset. In further embodiments, the at least one low-frequency blocking impedance may be configured to block a nominally 60 Hz frequency component. The at least one ballast connection port may include a first ballast connection port and a second ballast connection port and the at least one low-frequency blocking impedance may include a first low-frequency blocking impedance coupling the first ballast connection port to a first terminal of the solid-state lighting circuit and a second low-frequency blocking impedance coupling the second ballast connection port to a second input terminal of the solid-state lighting circuit.