Ditemukan 26027 dokumen yang sesuai dengan query
Hekal, Sherif
"This book addresses the design challenges in near-field wireless power transfer (WPT) systems, such as high efficiency, compact size, and long transmission range. It presents new low-profile designs for the TX/RX structures using different shapes of defected ground structures (DGS) like (H, semi-H, and spiral-strips DGS). Most near-field WPT systems depend on magnetic resonant coupling (MRC) using 3-D wire loops or helical antennas, which are often bulky. This, in turn, poses technical difficulties in their application in small electronic devices and biomedical implants. To obtain compact structures, printed spiral coils (PSCs) have recently emerged as a candidate for low-profile WPT systems. However, most of the MRC WPT systems that use PSCs have limitations in the maximum achievable efficiency due to the feeding method. Inductive feeding constrains the geometric dimensions of the main transmitting (TX)/receiving (RX) resonators, which do not achieve the maximum achievable unloaded quality factor. This book will be of interest to researchers and professionals working on WPT-related problems."
Singapore: Springer Singapore, 2019
e20503034
eBooks Universitas Indonesia Library
Watchara Amasiri; Wanchai Pijitrojana
Thammasat Printing House, 2017
500 TIJST 22:1 (2017)
Artikel Jurnal Universitas Indonesia Library
Nikita Kusuma
"Transfer daya nirkabel atau wireless power transfer (WPT) memiliki banyak aplikasi terutama untuk charging berbagai divais elektronika seperti implan-implan biomedik dan perangkat elektronik baik berdaya kecil (smartphone dan smart watch) ataupun berdaya besar (electronic vehicle). WPT yang memiliki topologi sederhana masih berupa tantangan karena banyak WPT yang sudah dikembangkan memiliki rangkaian elektronika yang rumit terutama dengan ditambahnya DC-DC konverter seperti kelas E. Penelitian ini menghadirkan sebuah WPT dengan metode IPT (Inductive Power Transfer) sebagai jembatan antara pemancar dan penerima yang kumparannya dibuat dengan tangan. Hasil simulasi dari desain dalam penelitian ini dengan komponen ideal menghasilkan sebuah pemancar dengan efisiensi rata-rata 77.25%, simulasi dengan komponen pasaran rata-rata 46.17%, dan hasil uji coba rangkaian pada protoboard rata-rata 41.62% dengan efisiensi tertingginya adalah 45.90%.
Wireless power transfer (WPT) has many applications especially for elctronic devie charging such as biomedic implants, low powered devices (smartphone and smart watch), and high powered devices (electronic vehicles). Although, a WPT with simple design that provides decent efficiency is still a challenge because most of developed WPT has complexity added to its circuit with the addition of DC-DC converters such as Class E converters. This research presents a WPT using IPT method as a bridge between transmitter and receiver which coils are made by hands. The simulation with ideal components resulted with an average efficiency of 77.25%, simulation with non-ideal comonents resulting in 46.17%, and the designed circuit on a protoboard with 41.62% average efficiency with the highest point in 45.90%."
Depok: Fakultas Teknik Universitas Indonesia, 2023
S-pdf
UI - Skripsi Membership Universitas Indonesia Library
Dandy Bagus Fauzan
Pada skripsi ini telah dipresentasikan desain rectifier untuk aplikasi wireless power transfer dengan topologi novel sebagai studi tahap awal. Topologi ini menggabungkan dan memodifikasi adaptive reconfigurable rectifierdengan active class E rectifier. Modifikasi yang dilakukan adalah mengganti switch NMOS pada active class E rectifiermenjadi PMOS pada topologi active class E rectifier dan mengubah jumlah dioda dan transistor yang digunakanpada topologi adaptive reconfigurable rectifier. Penggantian switch menjadi PMOS meningkatkan efisiensi dan menghasilkan output Wave form yang lebih baik. Penambahan jumlah diodadan jumlah transistor mencegah dioda mencapai breakdown voltage sehingga meningkatkan efisiensidan menjadikan rangkaian dapat mempertahankan dan meningkatkan efisiensi pada nilai inputyang lebih tinggi. Rangkaian usulan terdiri dari switch PMOS IRF9Z24 pada bagian active class E rectifier dan 3 dioda -3 transistor pada bagian adaptive reconfigurable rectifier memiliki efisiensi 76% pada input5 V dan 66% pada input10 V.
ABSTRACTThis thesis has presented a rectifier design for wireless power transfer applications with novel topology as an initial study. This topology combines and modifies the adaptive reconfigurable rectifier with the active class E rectifier. Modifications made were to replace the NMOS switch in the active class E rectifier to PMOS in the active class E rectifier topology and change the number of diodes and transistors used in the adaptive reconfigurable rectifier topology. Switching switches to PMOS increases efficiency and produces better Waveform output. Increasing the number of diodes and the number of transistors prevents the diodes from reaching the breakdown voltage, thereby increasing efficiency and allowing the circuit to maintain and increase efficiency at higher input values. The proposed circuit consists of the PMOS IRF9Z24 switch on the active class E rectifier and 3 diodes -3 transistors on the adaptive reconfigurable rectifier, which has an efficiency of 76% at 5 V."
2020
S-Pdf
UI - Skripsi Membership Universitas Indonesia Library
Toshihiro Kumagai
"Wireless power transmission is being investigated as a means to operate tiny medical devices such as the capsular endoscope, which is able to exist for a long period during diagnostic procedures within the body. In this paper, we examine the wireless power transmission to a capsular endoscope by electromagnetic waves to show its usability for medical applications. A modified helical antenna inside the endoscope is proposed as a power receiving antenna, operating at 915 MHz. By calculating a maximum received power in the stomach using such antenna, the results show that adequate power can be well received."
Depok: Faculty of Engineering, Universitas Indonesia, 2011
UI-IJTECH 2:1 (2011)
Artikel Jurnal Universitas Indonesia Library
Agba, Basile L.
"This book consists of the identification, characterization, and modeling of electromagnetic interferences in substations for the deployment of wireless sensor networks. The authors present in chapter 3 the measurement setup to record sequences of impulsive noise samples in the ISM band of interest. The setup can measure substation impulsive noise, in wide band, with enough samples per time window and enough precision to allow a statistical study of the noise. During the measurement campaign, the authors recorded around 120 noise sequences in different substations and for four ranges of equipment voltage, which are 25 kV, 230 kV, 315 kV and 735 kV. A characterization process is proposed, by which physical characteristics of partial discharge can be measured in terms of first- and second-order statistics. From the measurement campaign, the authors infer the characteristics of substation impulsive noise as a function of the substation equipment voltage, and can provide representative parameters for the four voltage ranges and for several existing impulsive noise models."
Switzerland: Springer Cham, 2019
e20501294
eBooks Universitas Indonesia Library
Baliga, B. Jayant
"This textbook provides an in-depth treatment of the physics of power semiconductor devices that are commonly used by the power electronics industry. Drawing upon decades of industry and teaching experience and using numerous examples and illustrative applications, the author discusses in detail the various device performance attributes that allow practicing engineers to develop energy-efficient products. Coverage includes all types of power rectifiers and transistors and analytical models for explaining the operation of all power semiconductor devices are developed and demonstrated in each section of the book. Throughout the book, emphasis is placed on deriving simple analytical expressions that describe the underlying physics and enable representation of the device electrical characteristics. This treatment is invaluable for teaching a course on power devices because it allows the operating principles and concepts to be conveyed with quantitative analysis. The treatment focuses on silicon devices but includes the unique attributes and design requirements for emerging silicon carbide devices. This new edition also includes a chapter on the impact of power semiconductor devices on energy savings and reduction of carbon emissions."
Switzerland: Springer Cham, 2019
e20502779
eBooks Universitas Indonesia Library
