Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 32 for “"switching technique"”.
-
A zero-voltage switching technique for high frequency buck converter ICs
This thesis explores a zero-voltage switching (ZVS) method that can be used to decrease the frequency dependent losses in a buck converter. The specific application for this thesis was a buck converter IC with an input voltage of up to 42V. The method utilizes the addition of an auxiliary circuit …
-
High voltage gain DC-DC converter using interleaved switching technique with PWM for current stress
… with high boost ratio by using Interleaved switching technique in order to reduce the inductance of inductor required in the proposed converter circuit structure. This project considered Marx generator principle to boost-up the voltage where the boost ratio used is 8.33 with three stages of …
-
Multilevel capacitor-clamped DC-DC boost converter structure with soft-switching technique implementation for high power density achievement
… DC-DC boost converter (CCBC) with soft-switching implementation for high power density achievement. The proposed 4-level CCBC has an ability to reduce the size and volume of passive components and have similar characteristics with the conventional DC-DC converter. Principally, the …
-
High-frequency quasi-resonant converter techniques
Two waveform-shaping techniques to reduce or eliminate the switching stresses and switching losses in switching-mode power conversion circuits are developed: the zero-current switching technique and the zero-voltage switching technique. Based on these two techniques two new families of …
-
Design zero-voltage switching DC-DC buck converter
This report proposes an integrated, high switching frequency, zero-voltage-switching dc-dc buck converter for battery charger application. The design and analysis of dc�dc buck converter with integrated inductor is presented. The converter has been optimized to convert 12V input voltage to 5V at …
-
SYSTEM MANAGEMENT IN A FRAME RELAY NETWORK
… improvement in the bit error rate. Fast packet switching is a new switching technique which has been defined in response to this improved error rate. In the spectrum of switching technologies it resides halfway between circuit switching and packet switching and benefits from their respective …
-
Implementation of a 100kW Soft-Switched DC Bus Regulator Based on Power Electronics Building Block Concept
… system. The zero current transition (ZCT) soft-switching technique is used to improve the performance of the bus regulator by minimizing switching loss and improving overall efficiency. PEBB modules and a digital control building block are the subsystems of the DC bus regulator. This thesis …
-
Pulse Density Modulated Soft Switching Cycloconverter
… stage cycloconverters generally incorporate hard switching at turn on and soft switching at turn off. This hard switching at turn on combined with the slow switching speeds of thyristors (the switch of choice for standard cycloconverters) limits their use to lower frequency applications. This …
-
Control, Analysis, and Design of SiC-Based High-Frequency Soft-Switching Three-Phase Inverter/Rectifier
… conduction mode (CRM) high-frequency soft-switching three-phase ac-dc converters (inverter and rectifier). The soft-switching technique with SiC devices grounded in CRM makes the operation of the ac-dc converter at hundreds of kHz possible while maintaining high efficiency with high power …
-
A demonstration of useful electric energy generation from piezoceramics in a shoe
… into a useful form using a high-frequency switching technique. The power conditioning circuitry consists of the following stages: Rectification, high-frequency switching (and step-down transformation), CMOS "555" timing and switcher control, low-side output filtering, load stage on/off …
-
High Frequency GaN Characterization and Design Considerations
… such as point-of-load (POL) converters, off-line switching power supplies, battery chargers and motor drives. GaN devices have a much lower gate charge and lower output capacitance than silicon MOSFETs and, therefore, are capable of operating at a switching frequency 10 times greater. This can …
-
Design of microstrip ultra wide band antenna with two notch filters for wireless communication
… putted on the slots to represent the ON and OFF switching status of an ideal Pin diode. By using this simple switching technique, the current distribution of the patch changes and enables the antenna to have four modes of operation. The achieved results demonstrate that the antenna can function …
-
Corona switching: an osmogene mitigation technique
… lead to renewed efforts to develop odor control techniques. The application of high energy coronas as a means to oxidize odorous gases has been limited by the relatively small size of the corona region around a given charged wire, approximately 1 centimeter at an applied voltage of 35 kilovolts. …
-
High-frequency off-line power conversion using quasi-resonant and multi-resonant techniques
… power conversion technologies, the zero-current-switching (ZCS) and zero-voltage-switching (ZVS) quasi-resonant techniques, and the zero-voltage-switching multi-resonant technique, are evaluated for high-frequency, off-line applications. The study is performed with emphasis on the …
-
Direct current hybrid vacuum breaker
Hybrid DC circuit breaker switching techniques have been proposed for use in multi-terminal HVDC networks, to create an efficient, reliable and controllable system. There are two DC hybrid switching techniques. The first is arc interruption based on current oscillation. The second is interruption …
-
Novel concepts in high-frequency resonant power processing
Two new power conversion techniques, the constant-frequency zero-voltage-switching multiresonant-converter (CF ZVS-MRC) technique and the zero-voltage-switching technique that uses the magnetizing inductance of the power transformer as a resonant element {ZVS {L<sub>M</sub>)) are proposed. …
-
Investigation of performance issues affecting optical circuit and packet switched WDM networks
Optical switching represents the next step in the evolution of optical networks. This thesis describes work that was carried out to examine performance issues which can occur in two distinct varieties of optical switching networks. Slow optical switching in which lightpaths are requested, …
-
Physical and practical limits of a biomolecular control system using nanoparticles and electromagnetic field irradiation
… control. This thesis proposes a simple control technique: a biomolecular \on/o" activity switch in which metallic nanoparticles (NPs) are conjugated to target biomolecules and irradiated with an electromagnetic field. Due to their unique physical properties, the NPs specifically absorb the …
-
Uncertainty-Integrated Surrogate Modeling for Complex System Optimization
… at a reasonable computational expense. In this technique, a new adaptive model switching (AMS) metric defined to guide the switching of model from one to the next higher fidelity model during the optimization process. The switching criterion is based on whether the uncertainty associated with …
-
Robust Adaptive Estimation for Autonomous Rendezvous in Elliptical Orbit
… filters that make use of robust estimation techniques is important due to the sensitivity of the typical minimum L2 norm techniques, such as the Kalman filter, to deviations in the assumed underlying probability distribution. In particular, those distributions with thicker tails than the …
Page 1 of 2