LED Lighting Device Dimming Control Circuit Design
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Solution Overview
Problem
Conventional lighting devices with light emitting diodes (LEDs) face challenges in maintaining constant brightness over their lifespan, particularly in road lighting applications, where dimming control is necessary but not effectively managed.
Innovation Solution
A lighting device with a circuit board featuring a light emitting diode array, two connectors for driving and dimming signals, and a driving unit that includes a rectifying module, converting module, and control module to manage alternating current and direct current signals, allowing for effective dimming control without interfering with the LED emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the driving unit is integrated with the LED array on the circuit board, then the device complexity is reduced, but the light emitted from the LEDs may interfere with the driving unit
Solution Approach 1:
The circuit board is divided into distinct functional areas: a first area for the LED array, a second area for the driving unit, and a third area as a separation space between them. This spatial segmentation prevents light from the LED array from interfering with the driving unit while maintaining overall device integration.
Solution Approach 2:
A separation space is introduced as an intermediary region between the LED array and the driving unit. This intermediate area acts as a buffer that blocks or redirects light emitted by the LEDs, preventing it from reaching and interfering with the driving unit components.
2Volume of moving object
If the driving unit is placed between the LED arrays to minimize separation distance, then the device size is reduced, but the light interference with the driving unit increases
Solution Approach 1:
The separation space is strategically positioned only in the region where light interference would occur between the LED array and driving unit, rather than uniformly spacing them throughout the entire device. This localized approach maintains compact overall dimensions while providing targeted protection against light interference.
3Reliability
If dimming control is added to maintain constant brightness, then the lighting device can maintain constant brightness within lifespan, but the device complexity increases
Solution Approach 1:
The driving unit is designed to perform multiple functions: it drives the LED array to emit light and simultaneously processes dimming signals to control brightness levels. By integrating these functions into a single unit, the patent avoids adding separate complex dimming control systems, thus maintaining brightness stability while limiting the increase in device 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 lighting device to maintain consistent brightness, expand its irradiation range, minimize size, and reduce power waste, while improving product lifespan by separating the driving unit between the LED arrays and allowing for dimming control based on external signals.
Implementation Method 1
a rectifying module which rectifies the driving signal input through the first connector
Implementation Method 2
a converting module which converts a voltage level of the dimming signal input through the second connector
Data Source
AI summary
Provided is an alternating current direct lighting device capable of a dimming control, the lighting device including: a circuit board having a light emitting diode array; a first connector disposed on the circuit board; a second connector disposed on the circuit board so as to be spaced apart from the first connector; and a driving unit for controlling light emission of the light emitting diode array on the basis of a driving signal input through the first connector and a dimming signal input through the second connector.