LED Lighting Device Compatible with Fluorescent Lamp Ballasts
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Solution Overview
Problem
Existing LED lighting devices cannot be directly connected to conventional fluorescent lamp ballasts without damaging the LED, as they cannot process the high-frequency signals and voltages generated by the ballasts, leading to operational failures or destruction.
Innovation Solution
An LED lighting device that includes a rectifier to convert the power signal from the fluorescent lamp ballast, a controller to manage the power transmission to the LED part, and a filter to smooth the output signal, allowing the device to operate safely and efficiently with various ballasts by controlling the electrical connection time and voltage/current levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an LED driving circuit is directly connected to a conventional ballast for fluorescent lamp, then the device complexity is reduced, but the LED cannot process the high frequency signal or voltage correctly, causing operational failure or destruction
Solution Approach 1:
The patent introduces an intermediary LED driving circuit that includes a rectifier, controller, and switch. This intermediary device bridges the conventional ballast and the LED lamp, enabling compatibility without requiring removal of the ballast. The driving circuit processes the high-frequency signal from the ballast and provides appropriate voltage/current control to the LED, thus resolving the contradiction between maintaining simple device architecture and ensuring operational reliability.
2Reliability
If the ballast is removed to use LED lighting device, then the LED can operate correctly, but all existing fluorescent lighting devices and the ballast must be removed, increasing device complexity and loss
Solution Approach 1:
The LED driving circuit is designed to be universally compatible with existing fluorescent lighting systems by accepting the high-frequency output from various ballast types. The circuit performs multiple functions including rectification of the AC signal, voltage regulation, and LED current control, enabling a single device to work with diverse ballast configurations without requiring system-wide removal or replacement.
3Ease of operation
If the LED driving circuit processes the high frequency signal from the ballast, then the LED can be operated, but without proper control the LED may be destroyed
Solution Approach 1:
The controller in the LED driving circuit incorporates feedback mechanisms that monitor the LED current and voltage conditions in real-time. Based on this feedback, the controller dynamically adjusts the switch duty cycle to maintain safe operating parameters for the LED. This feedback control prevents overvoltage and overcurrent conditions that could damage the LED while enabling proper operation from the ballast's high-frequency output.
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 the LED lighting device to be compatible with different ballasts, reduces power consumption, extends the lifespan by preventing voltage accumulation, and improves energy efficiency by controlling the power input to match the LED's requirements, thus preventing damage to components and ensuring stable operation.
Implementation Method 1
a rectifier which rectifies a power signal outputted from the ballast for a fluorescent lamp
Implementation Method 2
a filter which smoothes an output signal from the controller and transmits to the LED part
Data Source
AI summary
Disclosed is an LED lighting device using a ballast for a fluorescent lamp, the LED lighting device including: an LED part which includes at least one LED device; a rectifier which rectifies a power signal outputted from the ballast for a fluorescent lamp; and a controller which receives an output signal of the rectifier and controls power transmitted from the ballast to the LED part.