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This paper proposes an Active Thermal Control (ATC) method for MOS-gated power switches aimed at reducing temperature swing amplitude during operation. It leverages on the fact that thermal cycle amplitude of many actuation system components (such as power devices) has a large impact on the system reliability and lifetime. These figures can then be improved, which eases the adoption of electrification...
In this study, we examined demand response using air conditioners, determined the number of people by measuring CO2, and examined an application method to demand response. Most of the power in buildings is consumed by air conditioners, and their impact on the overall power consumption is high. Therefore, controlling the power consumption of air conditioners is an important factor in conducting demand...
The evaluation of energy consumption for space heating in urban environment is an interesting topic for the issues related to energy and pollution management. In the paper is presented the analysis of measured energy consumption for residential buildings located in the cities of Torino and Reggio Emilia (Italy). In the first analysis, space heating consumptions were correlated with climatic data....
The objective of this paper is to clarify the differences between cold aisle containment (CAC) and hot aisle containment (HAC) with regard to the air-intake temperature of the ICT equipment in the rack. Thus, we constructed a system in which these two capping methods could be compared under the same load and air-conditioned environment, and measured those thermal environments. When the ICT equipment...
Insulated gate bipolar transistors (IGBTs) are one of the most critical components in the Electric Vehicles (EVs) because of their complex running environment, high power dissipation and frequent junction temperature fluctuation. Therefore, it's essential to predict the lifetime of IGBTs by considering the actual factors in applications. The aim of this paper is to present a lifetime prediction method...
Smart Irrigation Decision Support (SIDS) system based on fuzzy logic using Wireless Sensor Network (WSN) is considered for precision water irrigation. WSN consists of limited-energy sensor nodes which are equipped with sensing, wireless communication and processing capabilities. SIDS aims to measure the agricultural parameters including the soil temperature and soil moisture using the sensor nodes...
Cu-doped zinc oxide (ZnO:Cu) powders were synthesized by the co-precipitation technique, by using different doping concentrations (1, 3 and, 5 at %). The structural properties of the powders were analyzed by X-ray diffraction (XRD), the morphology was investigated by scanning electron microscopy (SEM). Cu-doped ZnO and ZnO undoped pellets were manufactured with a pressing machine, using a pressure...
Apiculture has been a method for harvesting honey and helping crop proliferation, nonetheless late climate changes have affected bee population. Having an automated hive as a tool for beekeepers would help to increase and protect current bee population guaranteeing crop proliferation needed for human consumption. In this paper, we propose an electronic beehive that recollect honey automatically, regulate...
This paper presents the programming of a development kit infrared (IR) sensor for the acquisition of thermographs and thermographic data for the diabetic foot. The sensor is characterized to measure skin temperature by the radiometric technic, through a characteristic equation that allows predicting temperature of each pixel which is obtained by each bolometer. The system is capable of creating 3...
The issues of energy efficiency and energy balance in industrial enterprises are considered. Particular attention is paid to automatic control systems for heat supply in order to achieve energy savings. The experience of development, operation and maintenance phase of monitoring, analysis and control systems at heat supply facilities of enterprises in Vladivostok is given.
This paper presents the development of an energy efficient environmental sensor that sends measurement data to a cloud platform using HTTP (Hypertext Transfer Protocol) requests. The device is based on a programmable system-on-chip (PSoC), and is equipped with a temperature and relative humidity sensor for taking measurements and with a WLAN (wireless local area network) module for sending data to...
In this paper a measurement setup is presented that enables automatic characterization of silicon piezoresistive MEMS pressure sensors. It is used for determination of the pressure and temperature dependences of sensor electrical parameters. Some of the equipment in the setup, and the software application that controls the process, are developed at the Center of Microelectronic Technologies (CMT)...
The electrical and photosensing properties correlated with structure and morphology of TiO2/(GeSi/TiO2)2 multilayers are investigated. The multilayers are prepared by magnetron sputtering followed by rapid thermal annealing. Studies of Raman spectroscopy, transmission electron microscopy and X-ray diffraction are carried out. Measurements of dark current versus voltage and temperature are done. The...
Low-temperature silver sintering technology, which has been proven to be a promising die-attach solution, was extended to bonding large substrates. Strong bonding strengths for substrates greater than 25 mm × 50 mm were achieved by sintering a nanosilver paste at temperatures below 270°C with less than 5 MPa pressure. To characterize thermal performance of the substrate-attach interface, we applied...
Gallium Nitride (GaN) high electron mobility transistor (HEMT) is one of the promising candidates to replace existing switches in high-frequency high power converter applications. Reliability of GaN HEMT is an important issue for its commercial deployment. Online prognosis of this transistor ensures robust reliability for mission critical applications. Online prognosis requires identification of fault...
The aim of the reduction method is to integrate the reduced model in a multi-physical electric machine optimization procedure and use the obtained model in real-time monitoring of machine critical parts. In this paper, an electric machine thermal model reduction method is proposed. Using the lumped parameter thermal network (LPTN) method, a thermal model is developed in order to represent the thermal...
The root mean square (rms) measurement of alternating voltage of any waveform is frequently done by means of thermal transfer instruments. The principle of these thermal rms converters is to transfer the heating energy of resistive load to a temperature-sensing element. The dc voltage output of the sensor reflects the amount of electrical power (ac or dc) applied to the input. This paper is addressing...
A method for in-situ high bandwidth junction temperature estimation of Insulated Gate Bipolar Transistors (IGBTs) is introduced. The method is based on the acquisition of the gate voltage plateau during turn-on, which can be directly related to the junction temperature. This allows fast over temperature protection of the power device and thus enables operation at the boundary of the device safe operation...
Lifetime of aluminum electrolytic capacitors is of paramount importance, since in many power electronic voltage source converter systems this capacitor type is used in the DC-link. Thermal stress is one of the most critical stressors for electrolytic capacitors leading to wear-out and failures. Therefore, methods to perform online monitoring of the hotspot temperature of capacitors would lead to beneficial...
Electric vehicles (EVs) represent one of the solutions for reducing the carbon emissions worldwide. Even though EVs have recently gained more and more popularity, their adoption at a large scale is mainly prevented by several factors, such as range anxiety and battery degradation. The range of an EV is mainly limited by the energy density and specific energy of the battery, while the battery degradation...
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