Temperature Sensing Characteristics and Long Term Stability of Power LEDs Used for Voltage vs. Junction Temperature Measurements and Related Procedure
A detailed study about the direct measurement of junction temperature Ti of off-the-shelf power light emitting diodes (LED) is presented. The linear dependence on temperature of the voltage drop across the device terminals at a constant current is in particular exploited and fully characterized, in...
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| Format: | Article |
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IEEE
2020-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/9016035/ |
| _version_ | 1818733200707420160 |
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| author | Francesco Della Corte Giovanni Pangallo Riccardo Carotenuto Demetrio Iero Giuseppe Marra Massimo Merenda Sandro Rao |
| author_facet | Francesco Della Corte Giovanni Pangallo Riccardo Carotenuto Demetrio Iero Giuseppe Marra Massimo Merenda Sandro Rao |
| author_sort | Francesco Della Corte |
| collection | DOAJ |
| description | A detailed study about the direct measurement of junction temperature Ti of off-the-shelf power light emitting diodes (LED) is presented. The linear dependence on temperature of the voltage drop across the device terminals at a constant current is in particular exploited and fully characterized, in the temperature range from T = 35 °C to 135 °C, with tests repeated at one thousand different probe currents. The accurate experimental data, obtained on several LED samples bearing two different part numbers, are reported, showing that they exhibit a high degree of linearity in wide current ranges, a circumstance that allows for a fast and reliable calibration as sensors. The measurement error is also fully characterized in terms of repeatability and stability over time, with measurements repeated after 600, 900, 1200 and 1800 hours of applied electro-thermal stress, demonstrating that the relevant sensor parameters stabilize after a few hundred hours of operation. A full set of parameters is provided for the two device models, allowing the direct use of each LED for the self-monitoring of the junction temperature and ensure compliance with their safe operating area over time. Moreover, a procedure and a simple circuit for the real time measurement of Ti, while the LED is on, are presented. The procedure does not require a stable current source, and relies instead on the application of a sub-threshold current ramp for such a short time that the change in the output light is not perceived by human eyes. |
| first_indexed | 2024-12-17T23:45:41Z |
| format | Article |
| id | doaj.art-b34cd277a44f4fac841e05bbc7b1a7ae |
| institution | Directory Open Access Journal |
| issn | 2169-3536 |
| language | English |
| last_indexed | 2024-12-17T23:45:41Z |
| publishDate | 2020-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj.art-b34cd277a44f4fac841e05bbc7b1a7ae2022-12-21T21:28:19ZengIEEEIEEE Access2169-35362020-01-018430574306610.1109/ACCESS.2020.29765169016035Temperature Sensing Characteristics and Long Term Stability of Power LEDs Used for Voltage vs. Junction Temperature Measurements and Related ProcedureFrancesco Della Corte0https://orcid.org/0000-0002-2407-2979Giovanni Pangallo1https://orcid.org/0000-0001-9843-3653Riccardo Carotenuto2https://orcid.org/0000-0003-0633-9470Demetrio Iero3https://orcid.org/0000-0001-8499-7431Giuseppe Marra4https://orcid.org/0000-0002-2250-8863Massimo Merenda5https://orcid.org/0000-0003-3668-8014Sandro Rao6https://orcid.org/0000-0001-8485-5046Dipartimento di Ingegneria dell’Informazione, delle Infrastrutture e dell’Energia Sostenibile (DIIES), Mediterranea University of Reggio Calabria, Reggio Calabria, ItalyDipartimento di Ingegneria dell’Informazione, delle Infrastrutture e dell’Energia Sostenibile (DIIES), Mediterranea University of Reggio Calabria, Reggio Calabria, ItalyDipartimento di Ingegneria dell’Informazione, delle Infrastrutture e dell’Energia Sostenibile (DIIES), Mediterranea University of Reggio Calabria, Reggio Calabria, ItalyDipartimento di Ingegneria dell’Informazione, delle Infrastrutture e dell’Energia Sostenibile (DIIES), Mediterranea University of Reggio Calabria, Reggio Calabria, ItalyDipartimento di Ingegneria dell’Informazione, delle Infrastrutture e dell’Energia Sostenibile (DIIES), Mediterranea University of Reggio Calabria, Reggio Calabria, ItalyDipartimento di Ingegneria dell’Informazione, delle Infrastrutture e dell’Energia Sostenibile (DIIES), Mediterranea University of Reggio Calabria, Reggio Calabria, ItalyDipartimento di Ingegneria dell’Informazione, delle Infrastrutture e dell’Energia Sostenibile (DIIES), Mediterranea University of Reggio Calabria, Reggio Calabria, ItalyA detailed study about the direct measurement of junction temperature Ti of off-the-shelf power light emitting diodes (LED) is presented. The linear dependence on temperature of the voltage drop across the device terminals at a constant current is in particular exploited and fully characterized, in the temperature range from T = 35 °C to 135 °C, with tests repeated at one thousand different probe currents. The accurate experimental data, obtained on several LED samples bearing two different part numbers, are reported, showing that they exhibit a high degree of linearity in wide current ranges, a circumstance that allows for a fast and reliable calibration as sensors. The measurement error is also fully characterized in terms of repeatability and stability over time, with measurements repeated after 600, 900, 1200 and 1800 hours of applied electro-thermal stress, demonstrating that the relevant sensor parameters stabilize after a few hundred hours of operation. A full set of parameters is provided for the two device models, allowing the direct use of each LED for the self-monitoring of the junction temperature and ensure compliance with their safe operating area over time. Moreover, a procedure and a simple circuit for the real time measurement of Ti, while the LED is on, are presented. The procedure does not require a stable current source, and relies instead on the application of a sub-threshold current ramp for such a short time that the change in the output light is not perceived by human eyes.https://ieeexplore.ieee.org/document/9016035/LEDlight emitting diodesjunction temperaturetemperature sensorsdiode sensors |
| spellingShingle | Francesco Della Corte Giovanni Pangallo Riccardo Carotenuto Demetrio Iero Giuseppe Marra Massimo Merenda Sandro Rao Temperature Sensing Characteristics and Long Term Stability of Power LEDs Used for Voltage vs. Junction Temperature Measurements and Related Procedure IEEE Access LED light emitting diodes junction temperature temperature sensors diode sensors |
| title | Temperature Sensing Characteristics and Long Term Stability of Power LEDs Used for Voltage vs. Junction Temperature Measurements and Related Procedure |
| title_full | Temperature Sensing Characteristics and Long Term Stability of Power LEDs Used for Voltage vs. Junction Temperature Measurements and Related Procedure |
| title_fullStr | Temperature Sensing Characteristics and Long Term Stability of Power LEDs Used for Voltage vs. Junction Temperature Measurements and Related Procedure |
| title_full_unstemmed | Temperature Sensing Characteristics and Long Term Stability of Power LEDs Used for Voltage vs. Junction Temperature Measurements and Related Procedure |
| title_short | Temperature Sensing Characteristics and Long Term Stability of Power LEDs Used for Voltage vs. Junction Temperature Measurements and Related Procedure |
| title_sort | temperature sensing characteristics and long term stability of power leds used for voltage vs junction temperature measurements and related procedure |
| topic | LED light emitting diodes junction temperature temperature sensors diode sensors |
| url | https://ieeexplore.ieee.org/document/9016035/ |
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