Thermally Self-Stabilizing LED Module with Feedback Control
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Solution Overview
Problem
Existing LED modules retrofitted into flashlights fail to operate LEDs at their potential lighting capacity due to voltage limitations and thermal instability, leading to inefficient light production and potential damage from excessive heat.
Innovation Solution
A thermally self-stabilizing LED module with an amplifying circuit and microchip that senses heat using a thermistor to regulate energy delivery, adjusting current to maintain optimal operating conditions and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the LED is driven at maximum forward current to produce more light, then illumination intensity is improved, but the LED temperature increases causing potential damage and reduced lifespan
Solution Approach 1:
The patent implements a feedback control system using a thermistor to sense LED temperature and a microcontroller to adjust the forward current accordingly. When temperature exceeds a threshold, the system reduces current to prevent damage, thereby maintaining both high light output and safe operating temperature through continuous monitoring and adjustment.
Solution Approach 2:
The system dynamically adjusts the forward current to the LED based on real-time temperature conditions rather than operating at a fixed maximum current. This dynamic control allows the LED to operate at high intensity when cool and reduces current when temperature rises, optimizing both illumination and thermal management.
2Use of energy by moving object
If the available voltage is limited or depletes over time, then power consumption is reduced, but the forward current delivered to the LED decreases below maximum potential
Solution Approach 1:
The patent employs a boosting circuit that changes the voltage parameter to maintain adequate forward current to the LED even when battery voltage decreases over time. The circuit converts lower input voltage from depleted batteries into sufficient output voltage to drive the LED at or near maximum current, preserving light output while adapting to varying energy availability.
3Productivity
If the existing flashlight cannot sufficiently dissipate heat, then thermal management capability is limited, but the LED generates excessive heat reducing its lifespan and performance
Solution Approach 1:
The system uses a thermistor to provide real-time feedback on LED temperature to a microcontroller. Based on this feedback, the microcontroller dynamically adjusts the forward current to prevent excessive heat generation, ensuring the LED operates within safe temperature limits even when the flashlight's passive heat dissipation capability is insufficient.
Solution Approach 2:
The LED module performs self-thermal-management by monitoring its own temperature through the thermistor and automatically adjusting its operating current accordingly. This self-service capability allows the system to protect itself from overheating without requiring external thermal management infrastructure.
4Power
If the battery provides too much voltage, then power availability is improved, but the forward current exceeds the LED's maximum value causing damage
Solution Approach 1:
The patent uses a switching regulator circuit that changes the voltage parameter from high input voltage to a controlled output voltage suitable for the LED. The circuit incorporates feedback control to maintain the forward current within safe limits even when supplied with excessive battery voltage, thereby protecting the LED while utilizing available power effectively.
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 module allows LEDs to operate at their maximum potential while preventing damage from heat, ensuring efficient light production and extending the LED's lifespan by dynamically adjusting current based on temperature readings.
Implementation Method 1
The amplifying circuit has a thermistor arranged to sense heat from the LED
Implementation Method 2
a lighting module includes an LED
Implementation Method 3
LEDs generate significantly more heat
Data Source
AI summary
An improved LED module that is thermally self-stabilizing, and that is able to be retrofitted into an existing flashlight is provided. In one embodiment, the LED module includes a light emitting diode, an amplifying circuit and a microchip. The amplifying circuit includes a temperature sensing device to sense heat from the light emitting diode. The output of the amplifying circuit is input to the microchip which output to a switching device that regulates energy that is delivered to the light emitting diode. The switching device may be part of a boosting circuit, a bucking circuit or an inverting circuit.