scispace - formally typeset
Search or ask a question
Author

Javiera Cuenca

Bio: Javiera Cuenca is an academic researcher from University of Santiago, Chile. The author has contributed to research in topics: Thermoelectric cooling & Light-emitting diode. The author has an hindex of 1, co-authored 3 publications receiving 4 citations.

Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a PID control technique was implemented to control the voltage in the TEC devices and therefore the desired range of junction temperatures, obtained with computational simulations based on physical models and experimental recordings of the solder temperature dynamics.

8 citations

Proceedings ArticleDOI
06 Nov 2017
TL;DR: In this article, a thermoelectric control system using thermal-cooled cooler devices, which allows to improve the optical performance of deep UV LEDs operating at desired temperatures, is presented.
Abstract: A thermoelectric control system using thermoelectric cooler devices, allows to improve considerably the optical performance of deep UV LEDs operating at desired temperatures. Such a system was implemented monitoring and controlling temperature and optical intensities.

1 citations

Book ChapterDOI
30 Oct 2019
TL;DR: In this article, a proportional, integral, and differential controller (PID) control technique was implemented to control the voltage in the TEC devices, and therefore, the desired range of temperatures can be achieved.
Abstract: A thermoelectric control system using thermoelectric cooler devices (TEC) combined with an aluminum heat dissipater and a fan heat extractor allows improving considerably the optical performance of deep UV LEDs (285 nm) operating at desired temperatures. A proportional, integral, and differential controller (PID) control technique was implemented to control the voltage in the TEC devices, and therefore, the desired range of temperatures can be achieved. The PID parameters are obtained with computational simulations based on physical models and experimental data recordings of the temperature, using a thermistor sensor for the temperature measurements and SiC photodiode with UV enhanced system for the optical power measurements. The experimental data show that decreasing the temperature of the UV-C LED light source using a TEC increases the optical output power, while it has been shown that the lifetime of the LED devices can be improved.
Journal ArticleDOI
TL;DR: In this paper , different techniques and procedures applied for the characterization and calibration of solar cavity radiometers, with the main results obtained to date in the case of an Automatic Hickey-Frieden (AHF) radiometer.
Abstract: Solar-type cavity radiometers are instruments of the highest metrological level for measuring solar direct normal irradiance. To ensure their traceability and performance, they are periodically compared to the World Group of Standards, which realizes the World Radiometric Reference (WRR), in the International Pyrheliometer Comparisons (IPCs). Additionally, they can be characterized in an absolute way, with direct traceability to SI units and with their measurement uncertainty calculated. This paper describes the different techniques and procedures applied for the characterization and calibration of solar cavity radiometers, with the main results obtained to date in the case of an Automatic Hickey–Frieden (AHF) radiometer. Voltmeters, resistors, temperature sensors and the area of the precision apertures have been calibrated, while the effective absorptance, temperature coefficients, optical scattering and non-equivalence factor have been evaluated. The temperature dependence of the electrical current in the cavity heater has also been analysed. The resulting corrections obtained for the AHF by characterization are compatible with the WRR factors obtained by this instrument in the past IPCs. An uncertainty of 0.42% (k = 1) has been obtained, and this paper discusses further improvements that may be able to reduce this figure to the desired expanded uncertainty of U = 0.1% (k = 2).

Cited by
More filters
Journal ArticleDOI
TL;DR: In this article, a PID control technique was implemented to control the voltage in the TEC devices and therefore the desired range of junction temperatures, obtained with computational simulations based on physical models and experimental recordings of the solder temperature dynamics.

8 citations

Journal ArticleDOI
TL;DR: In this paper , a combined solution for multi-chip devices heat dissipation that integrates thermoelectric coolers (TECs) and microchannel heat sink to tune the temperature of each chip dynamically by controlling multiple TEC currents independently is proposed.

5 citations

Journal ArticleDOI
TL;DR: In this article, a delayed electrothermal collaborative cooling system based on a TEC-TEG system that uses an auxiliary charging technique for energy harvesting is proposed, which can improve energy utilization and reduce device cost, which helps to efficiently manage heat dissipation in high-power LEDs.
Abstract: With the development of high-power light-emitting diodes (LEDs), the heat flux density of devices has continued to increase, which, in turn, requires the development of increasingly effective methods of heat dissipation to control the working temperature of LEDs. Due to their impressive performance in solid refrigeration and energy harvesting, thermoelectric devices such as thermoelectric coolers (TECs) and thermoelectric generators (TEGs) have been used to develop the methods of heat dissipation, which have been applied to power components and electronic devices. This article proposes a delayed electrothermal collaborative cooling system based on a TEC–TEG system that uses an auxiliary charging technique for energy harvesting. In the designed delay circuit, two power source rails containing a TEG and a charged capacitor are switched automatically to supply energy to a TEC according to the charge on the capacitor and the discharge time of the delay circuit used for energy transmission. The results of experiments show that using the proposed scheme, the electromotive force can be increased by 21.6%, from 0.37 to 0.45 V, in the TEG module compared with the collaborative electrothermal cooling system without auto-delayed power rail switching. The switching time cost of the proposed system was only 0.8 s, and it could continuously supply enough electromotive force to drive the TEC and the overall cooling system. The proposed electrothermal collaborative cooling system with delayed power rail switching and auxiliary charging can improve energy utilization and reduce device cost, which helps to efficiently manage heat dissipation in high-power LEDs.

4 citations

Journal ArticleDOI
TL;DR: In this article , the effects of different factors (chip power, ambient temperature, chip distribution spacing and chip distribution shape) on the junction temperature of LED automotive lamp chip are explored by using the method of constant temperature experimental platform and ANSYS Workbench simulation; the experimental phenomena of LED junction temperature varying with different factors are analyzed in this paper.

3 citations