Sökning: "Power Module"

Visar resultat 11 - 15 av 75 avhandlingar innehållade orden Power Module.

1. 11. Dynamic avalanche in Si and 4H-SiC power diodes

   Författare :Martin Domeij; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Electrical engineering; electronics and photonics; Elektroteknik; elektronik och fotonik;

   Sammanfattning : Semiconductor power modules for the control of high currentsand high voltages have important applications in motor drives,traction and power transmission. Dynamic avalanche is of atechnological interest since it may limit the safe operatingarea for bipolar switching devices and for power diodes, whichare important integral parts of a power module. LÄS MER

3. 12. Investigation of Rear-Mounted Cooling Module Installations for Heavy Vehicles

   Författare :Lisa Larsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cooling package; Aerodynamics; Heat transfer; CFD;

   Sammanfattning : Due to stricter emissions legislations and increasing fuel prices vehicle efficiency must be improved. A trend that has been seen during recent years is increased engine power for many vehicle segments. Different exhaust gas after-treatment systems have also been introduced to be able to meet the emission demands. LÄS MER

4. 13. An experimental and numerical study of an automotive cooling module

   Författare :Anders Rynell; Gunilla Efraimsson; Michael Shur; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fan installation effects; spectral decomposition; aeroacoustics; Vehicle and Maritime Engineering; Farkostteknik;

   Sammanfattning : Heavy vehicles are major emitters of noise. Especially at idle or low vehicle speeds a large portion of the noise emanates from the fan that forces the flow through the cooling module. The aim of this work is to investigate and reveal aerodynamic and acoustic installation effects linked to the cooling package. LÄS MER

5. 14. Synthesis and Characterization of Composite Materials for Thermoelectric Power Generation

   Författare :Richard Heijl; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : In a thermoelectric material, a temperature difference will give rise to an electric potential that is proportional to the temperature gradient. In a closed circuit, this potential can keep a current flowing as long as the temperature gradient is maintained. LÄS MER

7. 15. Modeling Approaches for Active Antenna Transmitters

   Författare :Parastoo Taghikhani; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; thermal model.; MIMO; power amplifier; Active antenna transmitter; hybrid beamforming; electrothermal; active subarray antenna; nonlinear distortion;

   Sammanfattning : The rapid growth of data traffic in mobile communications has attracted interest to Multiple-Input-Multiple-Output (MIMO) communication systems at millimeter-wave (mmWave) frequencies. MIMO systems exploit active antenna arrays transmitter configurations to obtain higher energy efficiency and beamforming flexibility. LÄS MER