LED Drive Circuit Efficiency Control Through Dynamic Voltage Adjustment
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Solution Overview
Problem
LED illumination systems often compromise on energy efficiency by maintaining constant drive voltage or current, failing to adapt to variations in operating forward voltage and temperature.
Innovation Solution
Adjusting the drive voltage of LED modules to maintain a constant current while operating transistors in the linear region, using a closed-loop calibration system to stabilize brightness and efficiency levels, and incorporating temperature compensation logic to adapt to temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If constant drive voltage or current is maintained, then LED operation is simple and stable, but energy efficiency deteriorates
Solution Approach 1:
The patent implements dynamic drive voltage adjustment based on LED operating conditions. The system continuously monitors LED forward voltage and temperature, then dynamically modifies the drive voltage to maintain optimal efficiency while preventing overheating, transforming the static control approach into a dynamic adaptive system.
Solution Approach 2:
The patent changes the drive voltage parameter dynamically based on LED operating conditions. By adjusting the drive voltage according to measured forward voltage and temperature parameters, the system optimizes energy efficiency without requiring complex control mechanisms, directly addressing the contradiction between efficiency and complexity.
2Loss of energy
If drive voltage is adjusted to maintain constant current, then energy efficiency improves, but brightness stability may deteriorate
Solution Approach 1:
The patent implements a feedback mechanism that monitors LED forward voltage and temperature, then adjusts drive voltage accordingly. This closed-loop control ensures that brightness remains stable while energy efficiency is optimized, as the system continuously adapts to changing conditions to maintain optimal operating points.
Solution Approach 2:
The patent replaces traditional mechanical or fixed control methods with electronic parameter adjustment. By substituting fixed drive voltage/current control with dynamic electronic adjustment based on sensor feedback, the system achieves both efficiency improvement and brightness stability through software-controlled parameter optimization.
3Power
If transistors operate in saturation region, then current control is simple, but voltage drop and power consumption increase
Solution Approach 1:
The patent changes the transistor operating region from saturation to linear region by adjusting drive voltage parameters. This parameter change reduces voltage drop and power consumption in the transistor, directly addressing the power consumption issue while maintaining acceptable control through the adjusted voltage parameters.
Data Source
AI summary
This application is directed to controlling the illumination efficiency of a light emitting diode (LED) operation system, which includes an LED module and a current source. A power supply is configured to provide a configurable drive voltage. The LED module is coupled to the power supply interface and configured to be driven by the configurable drive voltage. The current source is (i) coupled to the power supply interface via the LED module and (ii) configured to stabilize a drive current of the LED module dynamically at a target drive current and hold an illumination efficiency of an LED operation system above a target efficiency level. In some embodiments, the current source includes a drive transistor coupled in series with the LED module. The current source is configured to hold the illumination efficiency of the LED operation system by controlling the drive transistor to operate in a linear region.