Amplifier Feedback Loop for Constant LED Irradiance
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Solution Overview
Problem
Solid-state lighting devices' irradiance output varies with operating temperature, affecting curing times and power consumption in industrial applications, particularly for photo-sensitive media, as they may not cure sufficiently or lead to increased electrical power consumption when operating away from nominal temperatures.
Innovation Solution
Incorporating a negative temperature coefficient device into a negative feedback loop of an amplifier to control current flow through light emitting devices, ensuring a substantially constant irradiance level across a wide range of temperatures, thereby maintaining consistent curing efficiency and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a constant voltage is applied to solid-state lighting devices at room temperature, then the irradiance output is greater than at nominal operating temperature, but the curing precision and power consumption control deteriorate
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the irradiance output of solid-state lighting devices and adjusts the applied voltage accordingly. This closed-loop feedback mechanism compensates for temperature-induced variations, maintaining consistent irradiance levels and ensuring precise curing of photo-sensitive media regardless of operating temperature conditions.
Solution Approach 2:
The patent dynamically adjusts electrical parameters (voltage and current) applied to solid-state lighting devices based on detected irradiance levels. By changing these electrical parameters in response to temperature variations, the system maintains constant irradiance output, thereby ensuring consistent curing precision across different operating temperatures.
2Adaptability or versatility
If solid-state lighting devices operate at temperatures away from nominal operating temperature, then the irradiance levels change, but the curing sufficiency and power consumption efficiency deteriorate
Solution Approach 1:
The feedback control system monitors irradiance output and adjusts power delivery to the solid-state lighting devices in real-time. This ensures that the devices operate at optimal power levels regardless of temperature conditions, preventing both under-curing (insufficient power) and over-consumption (excessive power), thereby improving energy efficiency across varying temperatures.
Solution Approach 2:
The system incorporates self-regulating capabilities where the control circuit automatically adjusts power consumption based on detected irradiance levels and temperature conditions. This self-service mechanism eliminates the need for external intervention to optimize power usage, allowing the system to adapt efficiently to temperature variations while maintaining consistent curing performance.
3Ease of operation
If constant voltage is applied without temperature compensation, then the system operation is simple, but the irradiance control precision deteriorates
Solution Approach 1:
The patent employs an automatic feedback control system that continuously measures irradiance output and adjusts voltage accordingly. This automated feedback mechanism maintains high irradiance control precision without requiring manual intervention or complex operating procedures, thus preserving ease of operation while achieving precise irradiance control across temperature variations.
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
This approach enables precise control of light emitting device irradiance, ensuring consistent curing of photo-sensitive media and lowering power consumption by maintaining a constant irradiance level, even at temperatures deviating from nominal operating conditions.
Implementation Method 1
a negative temperature coefficient device in thermal communication with the at least one light emitting device
Implementation Method 2
at least one light emitting device; an amplifier including a negative feedback loop
Data Source
AI summary
Systems and methods for operating one or more light emitting devices are disclosed. In one example, a negative temperature coefficient control parameter is applied to an amplifier to adjust a gain of the amplifier so as to provide a substantially constant level of irradiance output from one or more light emitting devices.