High-Emissivity LED Housing for AC Thermal Management

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Solution Overview

Problem

LED systems powered by AC power face challenges in managing heat generated by LED packages during operation, leading to high operating temperatures and inefficient energy use, with existing techniques being inadequate in providing effective thermal management and current stabilization.

Innovation Solution

The implementation of a feedback control mechanism for automatic current compensation and the use of high-emissivity surfaces for heat transfer, including a heat sink with a thermal emissivity of at least 0.6, to stabilize energy delivery and manage heat through blackbody radiation, along with the arrangement of LED devices in arrays and packages to optimize light output and thermal dissipation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If LED arrays are powered by AC power source, then high light output is achieved, but high operating temperature and heat generation occur

Engineering Contradiction:

Improvelight outputVSAvoidoperating temperature

Core Design Contradiction:

Illumination intensityVSTemperature

Solution Approach 1:

The patent converts the harmful heat generated by LED operation into beneficial blackbody radiation for heat dissipation. The housing is designed with high-emissivity internal surfaces that radiate heat from the LED arrays, transforming the waste heat into a useful thermal radiation mechanism for thermal management.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the thermal radiation parameters by designing the housing with specific emissivity characteristics. The internal surfaces are engineered to have high emissivity in the infrared range, optimizing the blackbody radiation parameters for effective heat dissipation at the operating temperatures of the LED arrays.

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If multiple arrays of LED devices are used, then high light output is achieved, but heat generation increases

Engineering Contradiction:

Improvelight outputVSAvoidheat generation

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The housing serves multiple functions: it provides structural support, electrical isolation, and thermal management. The high-emissivity internal surfaces perform dual roles of structural containment and active heat dissipation through blackbody radiation, eliminating the need for separate cooling components.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent transforms the waste heat from multiple LED arrays into beneficial thermal radiation. The housing's high-emissivity surfaces capture and radiate the heat energy, converting what would be wasted energy into an effective heat dissipation mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Stability of the object's composition

If feedback control mechanism is implemented, then current stabilization is achieved, but device complexity increases

Engineering Contradiction:

Improvecurrent stabilizationVSAvoidcircuit complexity

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The patent implements a feedback control mechanism using a current sense resistor and control circuit that monitors and adjusts the AC current supplied to the LED arrays. This feedback system stabilizes the current despite variations in LED forward voltage and AC line voltage, ensuring consistent light output.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent uses a current sense resistor as an intermediary element to monitor the current flowing through the LED arrays. This intermediary provides a measurable signal that the control circuit uses to adjust the power delivery, enabling stable current control without directly measuring the LED current.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 current delivery to LED arrays, reduces heat-related issues, and enhances light output uniformity and thermal management, improving the efficiency and reliability of LED systems by effectively managing heat through high-emissivity surfaces and optimized circuit designs.

Implementation Method 1

An LED lamp includes a high-emissivity surface area that emits heat through, among other ways, blackbody radiation

Methodology Applied

Scientific EffectBlackbody radiation: Thermal Radiation

Implementation Method 2

a heat sink that is attached to the LED package, and the heat sink is characterized by a thermal emissivity of at least 0.6

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS8541951B1High temperature LED system using an AC power source

Publication Date: 2013.09.24 KORRUS INC

AI summary

Power management and thermal management for high intensity LED lamps are disclosed.