LED Driving Circuit Brightness-Compensation Module Reduces Light Flicker
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Solution Overview
Problem
Existing LED driving circuits, particularly AC-LED systems, suffer from high light flicker due to discrete current levels, which can be harmful to human health and interfere with filming and photographing, and current solutions like coupling LED strings to high-capacity capacitors reduce service life and efficiency.
Innovation Solution
An electronic circuit with regulation modules and a brightness-compensation module that regulates current in LED strings based on rectified grid voltage, using a compensation regulator and capacitor to manage luminous flux and reduce flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high-capacity capacitors are used to reduce flicker, then light flicker is reduced, but service life is reduced and efficiency deteriorates
Solution Approach 1:
The patent changes the capacitance parameter from high values (hundreds of microfarads) to low values (nanofarads range) while using multiple capacitors in parallel. This parameter transformation allows achieving the same flicker reduction effect without the negative consequences of high-capacity capacitors, thereby extending service life and maintaining efficiency
2Object-affected harmful factors
If high-capacity capacitors are used to reduce flicker, then light flicker is reduced, but efficiency deteriorates
Solution Approach 1:
The patent transforms the capacitance parameter from high to low values while increasing the number of capacitors. This parameter change enables effective flicker reduction without the energy losses associated with high-capacity capacitors, thereby maintaining system efficiency
3Device complexity
If discrete current levels are used in AC-LED systems, then constructional simplicity is achieved, but light flicker increases
Solution Approach 1:
The patent segments the current regulation function into multiple independent regulation modules, each controlling a specific LED string. This segmentation allows continuous current regulation across all strings simultaneously, reducing flicker while maintaining the constructional simplicity of the AC-LED architecture
Solution Approach 2:
The patent introduces dynamic regulation where each module continuously adjusts current based on real-time voltage detection, transforming the static discrete current levels into dynamic continuous regulation, thereby reducing flicker without complicating the overall system structure
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 proposed circuit effectively reduces light flicker while maintaining efficiency and extending the service life of LED systems without the need for high-capacity capacitors, improving integration and performance.
Implementation Method 1
a capacitor coupled to the resistive element and configured to be charged through at least one portion of a current that flows in the resistive element
Implementation Method 2
LED sources are increasingly widespread, since they are characterized, among other things, by a high energy efficiency and a low power consumption given the same brightness
Data Source
AI summary
LED strings cascaded to one another are driven by an electronic circuit that includes regulation modules and a brightness-compensation module. The regulation modules carry out in sequence a current-regulation phase, in which they regulate the current that flows in the corresponding LED strings. The regulation module includes: a compensation regulator coupled to a compensation LED string and to a capacitor and a generator that generates an electrical quantity indicating the luminous flux emitted by the LED strings and by the compensation LED string. The compensation regulator regulates a current that flows in the compensation LED string as a function of the electrical quantity, discharging the capacitor through the compensation LED string.