Novel Ideas for Thermal Management of Filament LED Light Bulbs

Authors

  • Mika Maaspuro Department of Electrical Engineering and Automation, Aalto University, Espoo, Finland Postal address: PO BOX FI-00076 AALTO, Finland

DOI:

https://doi.org/10.3991/ijoe.v17i08.23695

Keywords:

filament LED, retro LED light bulb, thermal management of an LED bulb

Abstract


The thermal conditions of a filament LED retro light bulb has been investigated. In such light bulbs, LEDs are mounted on filaments which have glass or sapphire substrate and are surrounded by yttrium-aluminium-garnet (YAG). Heat management is challenging as a heatsink cannot normally be used. Instead, heat removal is enabled by using helium as the filling gas. As this provides less efficient heat removal than using a heatsink attached directly to an LED module, LEDs operate in filament LED bulbs typically at rather high temperatures. In this paper thermal performance of a typical filament LED bulb has been studied. LED temperatures and gas flows inside the bulb has been resolved for cases of different orientations of the bulb. Thermal conditions for different filling gases have been resolved. All this has been done using finite element method (FEM) simulations. The main target of this study has been to find out novel solutions for thermal management of filament LED bulbs. Two heat removal solutions have been studied, namely the use of an internal heatsink and an internal piezoelectric oscillating cantilever fan. The results show that solutions can indeed reduce temperature of LED chips and increase the lifespan of the LED bulb.

Author Biography

Mika Maaspuro, Department of Electrical Engineering and Automation, Aalto University, Espoo, Finland Postal address: PO BOX FI-00076 AALTO, Finland

Lic.Sc., ICT(electronics), University of Turku, Finland, M.Sc., electronics, Tampere University of Technology, Finland

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Published

2021-08-16

How to Cite

Maaspuro, M. (2021). Novel Ideas for Thermal Management of Filament LED Light Bulbs. International Journal of Online and Biomedical Engineering (iJOE), 17(08), pp. 60–73. https://doi.org/10.3991/ijoe.v17i08.23695

Issue

Vol. 17 No. 08 (2021)

Section

Papers

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