TY  - CHAP
AU  - Pohl, László
AU  - Németh, Márton
AU  - Hegedüs, János
AU  - Hantos, Gusztáv
AU  - Kohári, Zsolt
AU  - Poppe, András
TI  - Multi-Domain Modelling and Simulation of White CoB LEDs
T2  - 2019 25TH INTERNATIONAL WORKSHOP ON THERMAL INVESTIGATIONS OF ICS AND SYSTEMS (THERMINIC 2019)
PB  - Institute of Electrical and Electronics Engineers (IEEE)
CY  - New York, New York
SN  - 9781728120782
PY  - 2019
PG  - 7
DO  - 10.1109/THERMINIC.2019.8923856
UR  - https://m2.mtmt.hu/api/publication/30815538
ID  - 30815538
N1  - WoS:hiba:000534514800061 2020-09-02 15:10 befoglaló egyiknél nincsenek szerzők, befoglaló cím nem egyezik
AB  - The multi-domain operation of blue pump LEDs in a chip-on-board (CoB) device cannot be described properly by the existing chip level multi-domain compact models and a package compact thermal model because their operation is strongly affected by such parts of the environment as the substrate or the phosphor. In this case a mix of compact modelling and distributed modelling approaches need to be used. This paper presents a method that applies a chip level multi-domain LED compact model in a distributed way for the simulation of the LED chips and a Finite Volume Method based description for the whole package, including the temperature dependent light conversion taking place in the phosphor layer covering the entire LED chip array. The chip model describes the electrical, thermal and light output characteristics and their mutual dependence. This paper presents a new multi-domain phosphor model based on path tracing algorithms to describe the blue-to-yellow conversion, heat loss and light propagation in a distributed way for white CoB LEDs.
LA  - English
DB  - MTMT
ER  - 

TY  - JOUR
AU  - Poppe, András
AU  - Farkas, Gábor
AU  - Gaál, Lajos
AU  - Hantos, Gusztáv
AU  - Hegedüs, János
AU  - Kerecsen Istvánné Rencz, Márta
TI  - Multi-Domain Modelling of LEDs for Supporting Virtual Prototyping of Luminaires
JF  - ENERGIES
J2  - ENERGIES
VL  - 12
PY  - 2019
IS  - 10
SP  - 1909
PG  - 30
SN  - 1996-1073
DO  - 10.3390/en12101909
UR  - https://m2.mtmt.hu/api/publication/30683015
ID  - 30683015
AB  - This paper presents our approaches to chip level multi-domain LED (light emitting diode) modelling, targeting luminaire design in the Industry 4.0 era, to support virtual prototyping of LED luminaires through luminaire level multi-domain simulations. The primary goal of such virtual prototypes is to predict the light output characteristics of LED luminaires under different operating conditions. The key component in such digital twins of a luminaire is an appropriate multi-domain model for packaged LED devices that captures the electrical, thermal, and light output characteristics and their mutual dependence simultaneously and consistently. We developed two such models with this goal in mind that are presented in detail in this paper. The first model is a semi analytical, quasi black-box model that can be implemented on the basis of the built-in diode models of spice-like circuit simulators and a few added controlled sources. Our second presented model is derived from the physics of the operation of today’s power LEDs realized with multiple quantum well heterojunction structures. Both models have been implemented in the form of visual basic macros as well as circuit models suitable for usual spice circuit simulators. The primary test bench for the two circuit models was an LTspice simulation environment. Then, to support the design of different demonstrator luminaires of the Delphi4LED project, a spreadsheet application was developed, which ensured seamless integration of the two models with additional models representing the LED chips’ thermal environment in a luminaire. The usability of our proposed models is demonstrated by real design case studies during which simulated light output characteristics (such as hot lumens) were confirmed by luminaire level physical tests.
LA  - English
DB  - MTMT
ER  -