Dissertation/ Thesis
Driving mutually coupled coils using an array of class-E amplifiers ; E-sınıfı yükselteç dizisi kullanarak kuplajlı bobinlerin sürülmesi
| Τίτλος: | Driving mutually coupled coils using an array of class-E amplifiers ; E-sınıfı yükselteç dizisi kullanarak kuplajlı bobinlerin sürülmesi |
|---|---|
| Συγγραφείς: | Arghiani, Ziba |
| Έτος έκδοσης: | 2022 |
| Συλλογή: | Bilkent University: Institutional Repository |
| Θεματικοί όροι: | MRI system, State-space model, Class-E amplifier, Transmit array system |
| Περιγραφή: | Cataloged from PDF version of article. ; Includes bibliographical references (leaves 77-81). ; Linear radiofrequency (RF) power amplifiers are commonly used in magnetic resonance imaging (MRI) to generate radiofrequency field (B1). These low-efficiency amplifiers require cooling systems and lengthy transmission cabling, increasing the MRI hardware cost. An array of on-coil class-E amplifiers is pro-posed for the transmit system to mitigate these problems. Class-E amplifiers are switching type amplifiers capable of achieving 100% power efficiency theoretically. In this dissertation, a state-space model is proposed to simplify interpreting and analysis, and provide insight into the system of on-coil class-E amplifiers. This model can also be employed to find high power and efficiency modes of ampli-fiers’ operation. Using the state-space model, phase delays are adjusted between gate signals of the amplifiers to obtain high power and efficiency even in the presence of highly coupled coils. In addition, a sampled-data system generated from the state-space model is proposed to analyze the system’s transient behav-ior by investigating the time constant of the system. To validate the state-space model, a single class-E amplifier and two class-E amplifiers with coupled coils are simulated in LTSPICE. Moreover, novel hardware is designed for the class-E amplifier resulting in a cost-efficient design. Simulation and experimental results are provided to demonstrate the effectiveness of the proposed model. ; by Ziba Arghiani |
| Τύπος εγγράφου: | thesis |
| Περιγραφή αρχείου: | xiv, 81 leaves : illustrations (color), charts, graphics; 30 cm.; application/pdf |
| Γλώσσα: | unknown |
| Relation: | https://hdl.handle.net/11693/110547; B161319 |
| Διαθεσιμότητα: | https://hdl.handle.net/11693/110547 |
| Rights: | info:eu-repo/semantics/openAccess |
| Αριθμός Καταχώρησης: | edsbas.B2BEC1D3 |
| Βάση Δεδομένων: | BASE |
καταχωρήστε σχόλιο πρώτοι!