Hasil Pencarian  ::  Simpan CSV :: Kembali

"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."

"Wireless power transmission is being investigated as a means to operate tiny medical devices such as the capsular endoscope, which is ableto 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 suchantenna, the results show that adequate power can be well received. "

"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%."

"Teknologi implant biomedis menjadi salah satu teknologi yang paling banyak digunakan pada saat ini. Teknologi tersebut memanfaatkan sistem WPT untuk mentransmisikan energi nya. Salah satu bagian penting pada WPT adalah PA. Pada skripsi ini, didesain sebuah PA yang beroperasi pada frekuensi kerja 13.56 MHz yang dapat mencapai PAE hingga 80% dan gain hingga 20 dB. Pada PA ini digunakan konfigurasi Kelas A dengan menggunakan titik kerja kelas AB. PA dapat menghasilkan daya output hingga 10 dBm atau sekitar 10 mW. Tahapan desain dimulai dengan melakukan simulasi menggunakan perangkat lunak ADS (Advanced Design System) 2020 untuk menguji dan menganalisis PAE, gain, dan daya output. Berdasarkan hasil simulasi, didapatkan PAE sebesar 87.48%, gain sebesar 41.44 dBm, dan P1dB sebesar 12.39 dBm. Pada tahapan berikutnya, skematik rangkaian PA pada ADS didesain menjadi sebuah layout PCB dengan menggunakan komponen yang tersedia di pasaran. Layout PCB tersebut kemudian dicetak dan diuji. Berdasarkan pengukuran PCB, didapatkan PAE sebesar 14.58%, gain sebesar 39.1 dB, dan P1dB sebesar 12.4 dBm.

---

Biomedical implant technology is one of the most widely used technologies today. The technology utilizes the WPT system to transmit its energy. One of the important parts of WPT is PA. In this research, a 13.56 MHz PA that can reach PAE up to 80% and gain up to 20 dB has been designed. This PA used Class A configurations with Class AB operation. This PA could produce an output power up to 10 dBm or approximately 10 mW. The design process started from simulation using ADS (Advanced Design System) 2020 to observe and analyze PAE, gain, and output power. Based on simulation, this PA could reach PAE up to 87.48%, gain up to 41.44 dBm, and P1dB of 12.39 dBm. The next step of the design process is designing a PCB layout based on the schematic on ADS 2020 using available components. The PCB layout was printed and tested. Based on the PCB testing result, this PCB could reach PAE up to 14.58%, gain up to 39.1 dB, and P1dB of 12.4 dBm."

"Saat ini, pemanfaatan wireless power transfer untuk menyediakan daya bagi implan medis menjadi krusial dalam meminimalisasi tindakan operasi berulang yang diperlukan untuk penggantian baterai. Akan tetapi sistem Wireless Power dan Data Transfer (WPDT) konvensional memiliki dua koil induktif, sehingga diperlukan rangkaian yang kompleks dan area besar. Pada penelitian ini, diusulkan rangkaian pemancar WPDT koil tunggal dengan modulasi amplitudo shift keying (ASK) yang yang compact dan mampu menghasilkan efisiensi tinggi. Dua buah kapasitor parallel yang dirangkai seri dengan koil pemancar memungkinkan operasi transfer daya dan data berada pada kondisi optimal. Uji coba rangkaian pada level PCB memperoleh efisiensi sebesar 40,47% dan dapat ditingkatkan hingga 96,44% dengan rentang frekuensi 8,5 MHz hingga 11,5 MHz.

---

Currently, the utilization of wireless power transfer to provide power for medical implants is crucial in minimizing the need for repeated surgical procedures for battery replacement. However, conventional Wireless Power and Data Transfer (WPDT) systems have two inductive coils, requiring complex circuitry and a large area. In this study, a single-coil WPDT transmitter circuit with amplitude shift keying (ASK) modulation is proposed, which is compact and capable of achieving high efficiency. Two parallel capacitors connected in series with the transmitter coil enable power and data transfer operations to be in optimal condition. Circuit testing at the PCB level achieved an efficiency of 40.47% and can be improved up to 96.44% within the frequency range of 8.5 MHz to 11"

"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."

"Terjadinya Partial Discharge merupakan indikasi dari suatu kegagalan yang terjadi akibat kondisi dari transformator daya. Indikasi kegagalan dari karakteristik PD yang terjadi disebabkan oleh kesalahan desain/produksi dan penggunaan material yang kurang baik pada transformator daya. Pengidentifikasian kegagalan yang terjadi pada saat ini dilakukan dengan metoda investigasi setelah pengukuran PD. Metode yang digunakan tersebut sering menimbulkan interpretasi yang salah dalam mengatasi masalah yang terjadi sehingga berakibat lamanya pembuatan transformator daya. Penulisan tesis ini menunjukkan analisis menggunakan metoda berdasarkan kasus dari pengumpulan data karakteristik pola partial discharge yang dihasilkan dari pengujian didapatkan indikasi kegagalan dari kondisi transformator yang kurang baik terdeteksi dari pola pulsa yang muncul pada kuadran 1 dan 3 pada diagram sinusoidal. Selanjutnya dengan dipadukan karakteristik tingkatan hasil pengujian dan pengolahan secara statistik didapatkan kondisi transformator daya yang kurang baik memiliki kecenderungan kenaikan melebihi nilai 200 pC dan korelasi yang kuat antara tegangan dan tingkat partial discharge. Metoda tersebut juga bisa membedakan indikasi penyebab kondisi yang kurang baik pada transformator daya yang didapat dari analisis karakteristik tingkatan hasil pengujian dan pengolahan data penerapan tegangan dalam interval waktu tertentu dimana kondisi yang kurang baik yang disebabkan oleh kesalahan desain/produksi memiliki kecenderungan kenaikan yang lebih tinggi daripada akibat yang ditimbulkan dari penggunaan material yang kurang baik.

---

Partial Discharge is an early indication for the condition of power transformer that can make a failure. The failure is detected from PD characteristic could be made from design and material of power transformer. Nowadays failure identification is using investigation after partial discharge test measurement. This method usually makes wrong interpretation for solving problem so it takes along time for producing it.

This thesis will show the analyst using Base-Case Reasoning Method from collecting pattern characteristic from PD test measurement is resulting failure indication from bad condition of power transformer is detected from the appearance pulse in 1 and 3 quadrants at sinusoidal diagram. After that allied with level characteristic from testing and statistic processing is resulting indication of bad condition power transformer have a growing trend up to 200 pC and strong correlation between voltage and partial discharge level.

This method also can differ cause of bad condition power transformer from the characteristic testing and statistic processing from applying voltage in interval of time where the bad condition cause of wrong design have a rapid growing trend data than bad condition cause of using material."