LED Driver Voltage Detection and Brightness Control
Solution Overview
Problem
Existing LED lighting devices face challenges in adjusting light without altering existing wiring or structure, maintaining stable brightness and efficiency, and avoiding flickering due to unstable input voltage and high color temperature variation.
Innovation Solution
An apparatus comprising a voltage change detection module, delta detection and checking module, and brightness control signal generator that outputs a brightness control signal to the LED driver, allowing for light adjustment by detecting input voltage changes and generating signals to maintain stable output and low color temperature variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LED driver design focuses on maintaining steady brightness when input voltage changes, then LED has steady brightness without flickering and steady color temperature, but additional control signals are required which make light adjustment difficult due to existing wiring restrictions
Solution Approach 1:
The patent makes the existing LED driver perform dual functions: maintaining steady brightness stability and enabling light adjustment. By detecting input voltage changes and generating appropriate control signals, the driver can both stabilize LED operation and provide dimming capability through existing wiring, eliminating the need for separate adjustment circuits.
Solution Approach 2:
The LED driver automatically detects input voltage fluctuations and self-adjusts its control signals to maintain steady brightness. The system serves itself by using its own resources (voltage detection capability, control signal generation) to compensate for input variations without external intervention, while also providing adjustment functionality.
2Reliability
If additional control signals are required for LED light adjustment, then steady brightness can be maintained, but light adjustment becomes difficult due to restrictions of existing wiring and device structure
Solution Approach 1:
The patent implements a feedback mechanism where the LED driver continuously monitors the input voltage and adjusts its output control signals accordingly. This feedback loop enables the driver to maintain steady brightness while also providing light adjustment capability by modulating the control signals based on detected voltage changes, all through existing wiring.
3Device complexity
If LED is driven directly by AC, then no additional control signals are needed, but efficiency is low, LED flickers due to current frequency, and color temperature varies significantly
Solution Approach 1:
The patent replaces direct AC mechanical driving with an electronic control system. The LED driver converts AC input to controlled DC output through electronic switching and regulation, eliminating the problems of flickering and color temperature variation associated with direct AC driving, while maintaining efficiency through optimized electronic control.
4Ease of operation
If conventional voltage adjustment methods (variable resistor, TRIAC, SCR) are used, then light adjustment can be achieved, but these methods cannot maintain steady brightness and avoid flickering in LED applications
Solution Approach 1:
The patent changes the control parameter from simple voltage reduction (used in conventional methods) to pulse width modulation or frequency control. By varying the duty cycle or frequency of control signals rather than simply reducing voltage, the system achieves light adjustment while maintaining steady brightness and avoiding flickering, as the LED receives adequate power in controlled pulses.
Data Source
AI summary
An apparatus and method for driving and adjusting light is provided, applicable to an LED lighting environment. Without the necessity to change the existing wiring and lighting devices, the apparatus and method for driving and light adjusting apparatus of the present invention can enable the LED driver to adjust light so that the LED lighting device is capable of light adjustment. The apparatus and method for driving and adjusting light of the present invention lets the LED driver output stably drive LED when the input voltage to the LED driver changes so that the LED brightness can maintain stable without flickering regardless of the unstable input voltage as well as with high efficiency and low variation of LED color temperature. In this manner, in addition to the lighting capability, the LED lighting device also has the light adjustment capability because the LED driver has the light adjustment capability.