High-Emissivity Heat Sink for AC-Powered LED Thermal Management
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Solution Overview
Problem
LED systems powered by AC power face challenges in managing heat generated during operation, leading to inefficiencies and uneven light output, particularly when using multiple arrays of LED devices.
Innovation Solution
The implementation of a feedback system that includes a current monitor module and a temperature sensing module to adjust current levels through a compensation factor, coupled with a high-emissivity heat sink for effective thermal management and even light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple arrays of LED devices are used to increase light output, then illumination intensity is improved, but heat generation increases leading to thermal management problems
Solution Approach 1:
The patent converts the harmful heat generated by multiple LED arrays into beneficial blackbody radiation in the infrared spectrum. By designing the heat sink surface to emit thermal radiation effectively, the system uses the generated heat to produce additional infrared illumination, transforming a problem (excessive heat) into a useful output (infrared light for heating or illumination applications).
Solution Approach 2:
The patent changes the operational parameters of the LED system by operating LEDs at elevated temperatures (85°C to 150°C junction temperature) rather than attempting to maintain low temperatures. This parameter change allows the system to tolerate and utilize the heat generated,配合with the infrared emitting heat sink design, enabling high-power LED operation without traditional thermal management constraints.
2Ease of operation
If AC power source is used to simplify power supply, then ease of operation is improved, but current fluctuations occur leading to unstable LED output
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the AC input voltage and adjusts the drive current to the LED arrays accordingly. This feedback mechanism compensates for AC line voltage fluctuations, maintaining stable LED operation and consistent light output despite the variable nature of AC power supply.
Solution Approach 2:
The patent employs dynamic circuit elements including variable resistors and capacitors that automatically adjust their parameters in response to changing AC input conditions. This dynamic adaptation allows the circuit to maintain proper current regulation through voltage fluctuations without requiring complex active control components.
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 solution stabilizes energy delivery to LED arrays, reduces current fluctuations, and achieves even light output across multiple LED devices, enhancing thermal management and overall system performance.
Implementation Method 1
an LED lamp includes a high-emissivity surface area that emits heat through, among other ways, blackbody radiation
Implementation Method 2
the heat sink is characterized by a thermal emissivity of at least 0.6
Data Source
AI summary
An LED lighting system powered by an AC power source comprising a rectifier module configured to provide a rectified output to a first group of LED devices and a second group of LED devices electrically coupled to the first group of LED devices. A current monitor module electrically coupled to the first group and to the second group of LED devices is configured to determine a first current level using a drawn current level signal associated with the first group of LED devices and a second current level using a reference current level signal associated with the second group of LED devices. The current monitor module is electrically coupled to a temperature sensing module that is configured to generate at least one compensation factor based at least in part on a temperature. The compensation factor is used to control (directly or indirectly) current through the LED devices.