LED Driving System with Dynamic Voltage Adjustment
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Solution Overview
Problem
Conventional LED driving systems face inefficiencies due to varying forward voltages among LEDs, leading to excessive power consumption and overheating as they require a unified driving voltage that exceeds the working voltage of lower-voltage LEDs, causing unnecessary energy expenditure and heat generation.
Innovation Solution
A driving system with a brightness modulation module and multiple driving current generation modules that adjust the current magnitude and duty cycle based on channel voltage feedback, ensuring each LED operates at its optimal working voltage, reducing power consumption and heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a unified driving voltage is provided to all LED strings to ensure the highest voltage requirement is met, then all LED strings can operate normally, but the driving current generation modules connected to lower-voltage LED strings operate at voltages higher than their sufficient working voltage, causing excessive power consumption and heat generation
Solution Approach 1:
The patent implements dynamic voltage adjustment by allowing each driving current generation module to operate at its own optimal voltage level rather than forcing a unified voltage. The system dynamically adapts the operating voltage of each module based on the specific voltage requirements of its connected LED string, enabling lower-voltage modules to operate at their sufficient working voltage (e.g., 0.5V) rather than being forced to handle excessive voltage (e.g., 2.5V excess), thereby reducing power consumption and heat generation while maintaining reliable operation of all LED strings
Solution Approach 2:
The patent segments the driving system into multiple independent driving current generation modules, each capable of autonomous voltage adjustment. Instead of a single centralized power supply imposing a unified voltage on all LED strings, the system divides the driving function into separate modules that can be individually optimized. Each module independently manages its voltage output based on the specific requirements of its connected LED string, allowing the system to achieve both reliability and energy efficiency through decentralized control
2Reliability
If a unified driving voltage is provided to all LED strings to ensure the highest voltage requirement is met, then all LED strings can operate normally, but the driving current generation modules connected to lower-voltage LED strings generate more heat due to excessive voltage operation
Solution Approach 1:
The system dynamically adjusts the operating voltage of each driving current generation module to match the specific requirements of its connected LED string. This dynamic adaptation prevents lower-voltage modules from operating at excessively high voltages, thereby reducing the heat generated by these modules while ensuring that all LED strings receive the appropriate voltage for normal operation
Solution Approach 2:
The patent applies local quality by allowing each driving current generation module to have its own optimized operating characteristics. Instead of imposing a uniform voltage regime across the entire system, each module can operate at its locally optimal voltage level suited to its specific LED string's requirements. This localized optimization reduces heat generation in individual modules without compromising the overall system's reliability
Data Source
AI summary
A driving system for driving light-emitting modules includes driving current generation modules connected respectively to the light-emitting modules, and a brightness modulation module connected to the current generation modules and the light-emitting modules. Each driving current generation module is configured to receive signals from the brightness modulation module to control a driving current that flows through the light-emitting module it is connected to. The brightness modulation module is configured to generate the signals based on voltages provided at terminals of the light-emitting modules that are connected to the driving current generation modules.