LED Lighting Device Rectifier Ballast Adaptation
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Solution Overview
Problem
Conventional LED lighting devices cannot be directly connected to existing ballasts without damaging the LED driving circuit due to high-frequency or voltage issues, and they lack compatibility with various ballast standards, leading to instability and reduced lifespan.
Innovation Solution
An LED lighting device with a rectifier that adapts to different ballast frequencies by opening or short-circuiting impedance paths, and a current driving unit that includes a switch, diode, capacitor, and inductor to control and boost current, ensuring compatibility with both magnetic and electronic ballasts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the LED driving circuit is directly connected to the ballast without removing it, then the installation is simplified and compatibility is improved, but the LED driving circuit cannot process the high frequency or voltage of the ballast, causing the LED lamp to fail or be destroyed
Solution Approach 1:
The patent introduces a rectifier circuit as an intermediary component between the ballast and the LED driving circuit. This rectifier converts the high-frequency AC output from the ballast into a form that the LED driving circuit can process, thereby enabling compatibility while protecting the LED circuit from damage. The rectifier acts as a mediator that bridges the incompatibility between the ballast's high-frequency output and the LED circuit's requirements.
2Reliability
If the ballast is removed to use LED lighting device, then the LED can be properly driven, but the conventional lighting device and ballast must be removed, increasing device complexity and installation difficulty
Solution Approach 1:
The patent designs the LED lighting device with a universal interface that can work with both magnetic ballasts and electronic ballasts. The rectifier circuit and control unit are designed to handle different ballast types and frequencies, making the LED device universally compatible. This multi-functionality allows the LED device to maintain reliability while simplifying installation by eliminating the need to remove or replace the existing ballast.
3Duration of action of stationary object
If the LED is activated by very low direct current power, then the LED has longer life span and lower power consumption, but the LED cannot be applied to fluorescent lamp system which uses high frequency AC power
Solution Approach 1:
The patent employs parameter changes by introducing a rectifier circuit that converts the AC power parameters (high frequency, high voltage) from the ballast into DC power parameters (low voltage, controlled current) suitable for LED operation. This parameter transformation enables the LED to maintain its long lifespan and low power consumption characteristics while being compatible with fluorescent lamp systems that use high-frequency AC power.
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 safe and efficient operation of LED lighting devices on various ballasts, enhancing stability, reducing power consumption, and extending the lifespan by maintaining optimal voltage and current levels.
Implementation Method 1
a rectifier which rectifies a current power signal output from the ballast and transfers the rectified current power signal to the LED unit
Implementation Method 2
a capacitor and an inductor which store and release energy respectively in a reciprocal manner
Implementation Method 3
a capacitor and an inductor which store and release energy respectively in a reciprocal manner
Data Source
AI summary
An LED lighting device includes: an LED unit which includes at least one LED device; and a rectifier which rectifies a current power signal output from the ballast and transfers the rectified current power signal to the LED unit. When the ballast is a low-frequency ballast having an output frequency less than 60 Hz, the rectifier opens between a main path for supplying power to the rectifier from the ballast and an auxiliary path for preheating a starter or filament of the ballast. When the ballast is a high-frequency ballast having the output frequency greater than 20 kHz, the rectifier short-circuits between the main path for supplying the power to the rectifier from the ballast and the auxiliary path for preheating the filament of the ballast.