LED Driver Voltage Control for Low-Power Display Stability
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Solution Overview
Problem
Existing LED systems with constant voltage power supply modes face challenges in adjusting power consumption efficiently due to variations in LED forward voltage caused by temperature changes and aging, leading to either high power consumption or insufficient voltage levels that affect lighting/display effects.
Innovation Solution
A control method and device for the LED system that involves detecting output port voltages, adjusting the power supply using coarse and fine adjustment gears, and inter-chip communication to determine and adjust the supply voltage based on preset thresholds and feedback, ensuring optimal voltage levels for reduced power consumption while maintaining display effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a higher power supply voltage level is selected to ensure LED lighting/display effect, then the lighting quality is improved, but the power consumption of the entire LED system increases
Solution Approach 1:
The patent implements dynamic voltage adjustment by dividing the power supply voltage regulation into coarse adjustment and fine adjustment stages. The system continuously monitors LED forward voltage changes due to temperature and aging, then dynamically adjusts the power supply voltage to maintain optimal LED operation. This dynamic approach allows the system to use the minimum necessary voltage to achieve the required lighting effect, thereby reducing power consumption while maintaining lighting quality.
Solution Approach 2:
The patent changes the voltage parameter adaptively based on LED characteristics. By monitoring the forward voltage of LEDs and detecting changes caused by temperature and aging, the system adjusts the power supply voltage parameter accordingly. The coarse adjustment stage changes voltage in larger steps to quickly reach the appropriate range, while the fine adjustment stage makes smaller adjustments to precisely match the LED requirements, ensuring optimal lighting with minimal power consumption.
2Use of energy by moving object
If a lower power supply voltage level is chosen to reduce power consumption of the LED system, then the power consumption is reduced, but the lighting/display effect is affected due to insufficient voltage level
Solution Approach 1:
The patent employs feedback mechanisms to monitor the actual lighting effect and LED forward voltage. The system detects whether the current voltage level is sufficient for proper LED operation and adjusts accordingly. Through feedback from the LED system's actual performance and forward voltage measurements, the control algorithm determines whether to increase or decrease the power supply voltage, ensuring that the minimum necessary voltage is applied to maintain acceptable lighting quality while minimizing power consumption.
Solution Approach 2:
The system dynamically adapts the power supply voltage based on real-time LED characteristics. Rather than using a fixed low voltage that might be insufficient, the system continuously adjusts the voltage level according to LED aging and temperature changes, ensuring that the voltage is always adequate for the required lighting effect while keeping power consumption as low as possible.
3Device complexity
If a constant voltage power supply mode is used, then the power supply control is simple, but the system cannot automatically adjust the supply voltage according to changes of LED parameters such as forward voltage
Solution Approach 1:
The patent segments the voltage adjustment process into two distinct stages: coarse adjustment and fine adjustment. The coarse adjustment stage handles large voltage changes to quickly reach the appropriate voltage range, while the fine adjustment stage handles small precision adjustments to precisely match LED requirements. This segmentation allows the system to achieve adaptive voltage control without excessive complexity, as each stage has a specific function and can be implemented with relatively simple control logic.
Solution Approach 2:
The system transitions from static constant voltage control to dynamic adaptive voltage control. By implementing a two-stage adjustment mechanism that responds to LED forward voltage changes, the system gains the ability to automatically adapt to parameter changes while maintaining manageable control complexity through structured adjustment protocols.
Data Source
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AI summary
The present application relates to an LED system with controllable power supply and control method and device thereof. The control method comprises: detecting output port voltages of a main driving module, and when a number of output ports whose voltage is less than a first preset voltage or a number of output ports whose voltage is greater than a second preset voltage exceeds a first preset value, coarsely adjusting the power supply; determining by each of cascaded slave driving modules an adjustment strategy according to its own output port voltages and an adjustment strategy from a subsequent slave driving module, and sending its adjustment strategy to a previous slave driving module; determining by the main driving module an adjustment strategy of the power supply according to the adjustment strategy from the slave driving module and the output port voltages of the main driving module, and fine-adjusting the power supply.