Sökning: "voltage inversion"

Visar resultat 1 - 5 av 8 uppsatser innehållade orden voltage inversion.

  1. 1. Silicon surface passivation via ultra-thin SiO2, TiO2, and Al2O3 layers

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Författare :Anton Ek; [2019]
    Nyckelord :surface passivation; ALD; silicon; solar cell; SiO2; Al2O3; TiO2; stacks; characterization; optimization; RSM; temperature;

    Sammanfattning : Energy traps at the silicon surface originating from discontinuities in the lattice is detrimental to the performance of solar cells. Acting as recombination centers, they offer a location where the charge carriers may easily return to their original energy band after excitation. LÄS MER

  3. 2. Fabrication and Characterization of 4H-SiC MOS Capacitors with Different Dielectric Layer Treatments

    Master-uppsats, Linköpings universitet/Halvledarmaterial

    Författare :Otkur Wutikuer; [2018]
    Nyckelord :4H-SiC; MOS capacitor; Dielectric layer; PECVD; C-V measurement; Interface states.;

    Sammanfattning : 4H-SiC based Metal-Oxide Semiconductor(MOS) capacitors are promising key components for next generation power devices. For high frequency power applications, however, there is a major drawback of this type of devices, i.e. LÄS MER

  4. 3. The impacts of series compensated EHV lines on distance protection, and a proposed new mitigation solution

    Master-uppsats, KTH/Elektroteknisk teori och konstruktion

    Författare :Syed Arif Ullah Shah; [2017]
    Nyckelord :Series compensation; metal oxide varistor; voltage inversion; current inversion; sub-synchronous oscillation; quadrilateral characteristic distance relay; digital high-pass filter; Seriekompensation; metalloxidvaristor; spänningsinversion; ströminversion; subsynkron oscillation; fyrsidig karakteristiskt distansrelä; digitalt högpassfilter;

    Sammanfattning : Series compensation is extensively applied to the transmission lines to increase the power transfer capability of transmission lines, reduce transmission losses, improve voltage profiles, and improve power oscillation damping and transient stability of power systems. But it modifies the apparent impedance of the transmission lines during fault conditions and might cause the distance protection of transmission lines to encounter directional discrimination issues and reach problems. LÄS MER

  5. 4. Hardware Implementation of Number Inversion Function

    Master-uppsats, Lunds universitet/Institutionen för elektro- och informationsteknik

    Författare :Jiajun Chen; Jianan Shi; [2016]
    Nyckelord :Harmonized Parabolic Synthesis; unrolled Newton-Raphson; power consumption.; Technology and Engineering;

    Sammanfattning : Nowadays, number inversion is of great significance and a complex arithmetical operator, especially the implementation in hardware. It provides a higher speed performance and lower power consumption. Initially, the conversion of the inputs to floating-point numbers contains sign, exponent, and mantissa parts. LÄS MER

  7. 5. Ultra-low power circuits for power management

    Master-uppsats, KTH/Skolan för informations- och kommunikationsteknik (ICT)

    Författare :Giuseppe Forestiere; [2014]
    Nyckelord :;

    Sammanfattning : Recent developments in energy harvesting techniques allowed implementation of completely autonomous biosensor nodes. However, an energy harvesting device generally demands a customized power management unit (PMU) in order to provide the adequate voltage supply for the biosensor. One of the key blocks within this PMU is a regulation DC-DC converter. LÄS MER