LED Controller Dynamic Voltage Adjustment for Power Efficiency
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Solution Overview
Problem
LED display devices face power consumption inefficiencies due to manufacturing dispersion and temperature characteristics of light-emitting diodes, leading to excessive voltage application and heat generation when diodes with varying forward voltage drops are connected in series.
Innovation Solution
A light-emitting diode controller with a voltage source circuit, current source circuit, first and second voltage detectors, and a voltage controller that adjusts the voltage fed to the diodes to maintain optimal operating conditions, ensuring the voltage is between specific reference voltages to minimize power waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a power supply voltage higher than the maximum assumed forward voltage drop is fed to ensure proper operation of all LEDs, then all LEDs can operate reliably, but excessive power is consumed and excess heat is generated in LEDs with smaller forward voltage drops
Solution Approach 1:
The patent applies dynamics by making the power supply voltage adjustable rather than fixed. The controller dynamically changes the power supply voltage based on detected LED characteristics, allowing the system to adapt to variations in forward voltage drops among different LEDs while maintaining reliable operation and minimizing power waste.
Solution Approach 2:
The patent changes the voltage parameter adaptively. By detecting the actual forward voltage drop of each LED and adjusting the power supply voltage accordingly, the system optimizes the voltage parameter to match the specific LED characteristics, preventing both under-voltage operation and excessive power consumption.
2Stability of the object's composition
If a fixed high power supply voltage is used to accommodate manufacturing dispersion in LED forward voltage drops, then consistent operation is achieved, but unnecessary power consumption increases
Solution Approach 1:
The patent implements feedback by detecting the actual forward voltage drop of each LED and using this information to adjust the power supply voltage. This closed-loop control ensures operational consistency while preventing unnecessary power consumption by matching the supply voltage to the actual LED requirements.
Solution Approach 2:
The system changes the voltage parameter based on feedback from voltage detection. By adjusting the power supply voltage according to the detected forward voltage drop, the system maintains operational consistency across different LED types while optimizing power consumption for each specific LED's characteristics.
3Loss of energy
If the power supply voltage is precisely matched to each LED's forward voltage drop, then power efficiency is maximized, but the system complexity increases due to detection and control requirements
Solution Approach 1:
The patent uses feedback control where the controller detects the forward voltage drop and automatically adjusts the power supply voltage accordingly. This feedback mechanism simplifies the overall system by using the LED's own characteristics to determine its operating parameters, reducing the need for complex external adjustment mechanisms.
Solution Approach 2:
The system enables self-service control where the LED's own voltage characteristics are used to determine its operating parameters. The detection circuit measures the actual forward voltage drop and the controller automatically adjusts the supply voltage, allowing the LED system to self-optimize without requiring complex external intervention.
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 solution effectively reduces unnecessary power consumption and heat generation by dynamically adjusting the voltage applied to light-emitting diodes, ensuring consistent luminance and extending the lifespan of the LED display devices.
Implementation Method 1
For a light-emitting diode, when a current flows in the forward direction from the anode to the cathode, light is emitted
Implementation Method 2
a voltage source circuit that feeds a voltage to the anode of a light-emitting diode, a current source circuit that selectively feeds a current to the cathode of the light-emitting diode
Data Source
AI summary
Light-emitting diode controller 10 contains voltage source circuit 33 for feeding voltage to the anode of light-emitting diode 13, current source circuit 34 that selectively feeds current to the cathode of light-emitting diode 13, first voltage detector 36 that compares the cathode voltage of light-emitting diode 13, connected to current source circuit 34, to a first reference voltage, second voltage detector 37 that compares the cathode voltage to a second reference voltage lower than said first reference voltage, and voltage controllers 32, 35 that control the voltage value of the voltage fed from current source circuit 34. Here, voltage controllers 32, 35 control voltage source circuit 33 so that the voltage fed by current source circuit 34 is in the range between the first reference voltage and the second reference voltage.