Thermal Characterization of Non-Isolated DC to DC Convertor

2011 ◽  
Author(s):  
Shiladitya Chakravorty ◽  
Bahgat Sammakia ◽  
Varaprasad Calmidi
Keyword(s):  
Power Dissipation ◽  
High Performance ◽  
Field Effect Transistors ◽  
Thermal Characteristics ◽  
Thermal Characterization ◽  
Input Voltage ◽  
Thermal Design ◽  
Power Module ◽  
Improved Performance

Improved performance of semiconductor devices in recent years has resulted in consequent increase in power dissipation. Hence thermal characterization of components becomes important from an overall thermal design perspective of the system. This study looks at a high performance non-isolated point of load power module (a DC to DC converter) meant for advanced computing and server applications. Thermal characteristics of the module were experimentally analyzed by placing the power module on a bare test board (with no insulation) inside a wind tunnel with thermocouples attached to it. There were three devices on this module that dissipate power. There were two FETs (Field Effect Transistors) and an inductor which can be considered as sources. The consolidated power dissipation from the module was calculated by measuring the input voltage and input current while keeping the output voltage and current constant. Temperatures at various points on the module and the test card were recorded for different air flow velocities and overall power dissipation. Subsequently this set up was numerically analyzed using a commercially available computational fluid dynamics (CFD) code with the objective of comparing the results with experimental data previously obtained.

Thermal Characterization of an All-Active Microring Resonating Laser

2004 ◽  
Author(s):  
Amy S. Fleischer ◽  
Ute Troppenz ◽  
Michael Hamacher ◽  
Werner John
Keyword(s):  
Thermal Analysis ◽  
Power Dissipation ◽  
Operating Temperature ◽  
Thermal Characterization ◽  
Optical Signal ◽  
Thermal Design ◽  
Microring Resonator ◽  
Design Stage ◽  
Vertical Coupling

Active microring optical devices are promising candidates for use in next generation optical signal processing and sensor products. In this design, an InP based microring laser is vertically coupled to a passive feeding waveguides using a waferbonding technology. The vertical coupling is expected to detrimentally affect the operating temperature and device performance through the low thermal conductivity of the bond material. Thus, a thermal analysis is undertaken in the design stage to better understand the implications of this fabrication process. A thermal analysis of a basic microring resonator of 50 μm radius and 100 mW power dissipation is presented and thermal design variations are discussed.

scholarly journals Impact of spineless cactus cultivation (O. Ficus-indica) on the thermal characteristics of soil

2018 ◽  
Vol 13 (1) ◽  
pp. 1
Author(s):  
Willames De Albuquerque Soares
Keyword(s):  
Heat Capacity ◽  
Thermal Characteristics ◽  
Thermal Characterization ◽  
Biological Processes ◽  
Volumetric Heat Capacity ◽  
Average Value ◽  
Brazilian Semiarid ◽  
Cultivation Techniques ◽  
Soil Changes

Temperature is a fundamentally important factor for understanding the physical, chemical, and biological processes that occur in soil. However, there are few studies in the Brazilian semiarid zone that seek to understand how soil degradation affects its thermal characteristics. The objective of this study was to evaluate the influence of cultivation techniques on the thermal characterization of soil, using the model proposed by Johansen. The study was conducted in the Agreste region of the state of Pernambuco, Brazil on two plots of land, one with native vegetation (Caatinga) and the other with spineless cactus (O. ficus - indica). It was observed that the procedures used to prepare the soil for cultivation of spineless cactus caused a reduction in the capacity to transmit the surface temperature to the interior of the soil. Changes in the physical properties of the soil required for cultivation resulted in a reduction in the average value of the volumetric heat capacity of about 22%; an increase of approximately 5% in the average volumetric heat capacity and a 26% increase in the thermal diffusivity of the soil, as well as a reduction of approximately 50% in the heat flux from the surface of the soil.

scholarly journals Thermal characterization of different graphite polystyrene

2018 ◽  
Vol 9 (2) ◽  
pp. 163-168 ◽  
Author(s):  
Á. Lakatos ◽  
I. Deák ◽  
U. Berardi
Keyword(s):  
Thermal Conductivity ◽  
High Performance ◽  
Thermal Characterization ◽  
Expanded Polystyrene ◽  
High Moisture ◽  
Insulating Materials ◽  
Insulation Materials ◽  
Vacuum Insulation ◽  
Study Laboratory

The development of high performance insulating materials incorporating nanotechnologies has enabled considerable decrease in the effective thermal conductivity. Besides the use of conventional insulating materials, such as mineral fibers, the adoption of new nano-technological materials such as aerogel, vacuum insulation panels, graphite expanded polystyrene, is growing. In order to reduce the thermal conductivity of polystyrene insulation materials, during the manufacturing, nano/micro-sized graphite particles are added to the melt of the polystyrene grains. The mixing of graphite flakes into the polystyrene mould further reduces the lambda value, since graphite parts significantly reflect the radiant part of the thermal energy. In this study, laboratory tests carried out on graphite insulation materials are presented. Firstly, thermal conductivity results are described, and then sorption kinetic curves at high moisture content levels are shown. The moisture up-taking behaviour of the materials was investigated with a climatic chamber where the relative humidity was 90% at 293 K temperature. Finally, calorific values of the samples are presented after combusting in a bomb calorimeter.

Thin film field-effect transistors of 2,6-diphenyl anthracene (DPA)

2015 ◽  
Vol 51 (59) ◽  
pp. 11777-11779 ◽  
Author(s):  
Jie Liu ◽  
Huanli Dong ◽  
Zongrui Wang ◽  
Deyang Ji ◽  
Changli Cheng ◽  
...  
Keyword(s):  
Thin Film ◽  
Field Effect ◽  
High Performance ◽  
Field Effect Transistors ◽  
Synthesis And Characterization ◽  
Design Synthesis

The present work showed the design, synthesis and characterization of a high performance anthracene-based semiconductor.

Thermal characterization of high performance PBI and 6F polymers and their alloys

1992 ◽  
Vol 32 (17) ◽  
pp. 1236-1241 ◽  
Author(s):  
Michael Jaffe ◽  
M. Ishaq Haider ◽  
Joseph Menczel ◽  
Joseph Rafalko
Keyword(s):  
High Performance ◽  
Thermal Characterization

Thermal characterization of planar high temperature power module packages with sintered nanosilver interconnection

2016 ◽  
Vol 63 ◽  
pp. 104-110 ◽  
Author(s):  
David Berry ◽  
Adrian Townsend ◽  
Weikun He ◽  
Hanguang Zheng ◽  
Khai D.T. Ngo ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Characterization ◽  
Power Module

Design of Low Power CMOS Comparator using 180nm Technology for ADC Application

2017 ◽  
Vol MCSP2017 (01) ◽  
pp. 11-13
Author(s):  
Truptimayee Behera ◽  
Ritisnigdha Das
Keyword(s):  
Low Power ◽  
Power Dissipation ◽  
High Speed ◽  
High Performance ◽  
Input Voltage ◽  
Clock Frequency ◽  
Nmos Transistor ◽  
Body Effect ◽  
Low Power Dissipation ◽  
Low Power Cmos

In our design of CMOS comparator with high performance using GPDK 180nm technology we optimize these parameters. We analyse the transient response of the schematic design and the gain is calculated in AC analysis and also we measure the power dissipation. The circuit is built by using PMOS and NMOS transistor with a body effect. A plot of phase and gain also discussed in the paper. Finally a test schematic is built and transient analysis for an input voltage of 2V is measured using Cadence virtuoso. Simulation results are presented and it shows that this design can work under high speed clock frequency 200MHz. The design has low power dissipation.

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