IAES Nawala: Wireless power transfer

Salam, rekan Nawala! Semoga kalian selalu dalam keadaan sehat.

Ini adalah Nawala IAES dari Institute of Advanced Engineering and Science. Hari ini kami akan berbagi kabar tentang teknologi wireless power transfer (WPT). WPT adalah teknologi yang memungkinkan energi listrik ditransmisikan dari sumber ke perangkat elektronik tanpa memerlukan kabel atau sambungan listrik. Teknologi ini didasarkan pada prinsip-prinsip medan elektromagnetik dan kopling resonansi. Yamaguchi dkk. (2023) melakukan eksperimental review mengenai improvisasi WPT menggunakan auto tuning. Hasil selengkapnya dapat dilihat pada artikel berikut:

Experimental review of an improving system on wireless power transfer via auto tuning of frequency

Kazuya Yamaguchi, Ryusei Okamura, Haruto Terada, Kenichi Iida

Wireless power transfer for electric vehicles is focused because these vehicles cannot run long distance without frequently charging. If these vehicles are charged from outside wirelessly, for example an alternating current (AC) power supply is embed under road, the problem is going to be solved. However, efficiency of wireless power transfer depends on various factors, therefore many contrivances should be considered to realize optimal transfer. In this paper, we focused on frequency of inverter, and created auto tuning system of it in response to the distance of inductors. On this system, frequency was modified automatically by a microcontroller and sensor at the same time position of a load changed. Finally, we confirmed that voltage of light emitting diode (LED) was improved by utilizing our system compared with non-tuning frequency.

Auto-tuning frekuensi pada WPT mengacu pada kemampuan sistem untuk menyesuaikan frekuensi operasi secara otomatis untuk mengoptimalkan efisiensi transfer daya. Yamaguchi dan Iida (2022) juga mengimplementasikan auto tuning pada kendaraan listrik. Hasil dari implementasinya tersebut dapat dilihat pada artikel berikut:

Auto tuning of frequency on wireless power transfer for an electric vehicle

Kazuya Yamaguchi, Kenichi Iida

In these days, electric vehicles are enthusiastically researched as a countermeasure to air pollution, although these do not have practicality compared to gasoline-powered vehicles. The aim of this study is to transport energy wirelessly and efficiently to an electric vehicle. To accomplish this, we focused on frequency of an alternating current (AC) power supply, and suggested a method which determined the value of it constantly. In particular, a wireless power transfer circuit and a lithium-ion battery in an electric vehicle were expressed with an equivalent circuit, and efficiency of energy transfer was calculated. Furthermore, the optimal frequency which maximizes efficiency was found, and the behavior of voltage was demonstrated on a secondary circuit. Finally, we could obtain the larger electromotive force at the secondary inductor than an input voltage.

Magnetic resonance coupling adalah teknologi WPT yang memanfaatkan prinsip-prinsip resonansi elektromagnetik untuk mentransmisikan energi listrik secara efisien antara kumparan pemancar dan kumparan penerima. Teknologi ini sangat relevan dalam aplikasi yang membutuhkan jarak yang lebih jauh antara kumparan dan kecepatan transfer daya yang lebih tinggi dibandingkan dengan metode inductive coupling tradisional. Nafiaa dan Zuheer Yonis (2022) mengembangkan magnetic resonance coupling untuk teknologi ramah lingkungan. Hasil dari penelitiannya dapat dilihat pada artikel berikut:

Magnetic resonance coupling wireless power transfer for green technologies

Reem Emad Nafiaa, Aws Zuheer Yonis

Wireless power transfer (WPT) is a technology that is considered the focus of scientists’ attention for its development and creation to be compatible with many devices that are used today and also consider one of the green technology apps which means any technology can reduce the effect of people on the environment which is today grow continuously. In this paper, a wireless power transfer for a mobile charger had been discussed to get a maximum power and efficiency power transfer. WPT is considered as a reliable technology, efficient, fast, not using wires, and can be used for short and long-range. There are three methods for WPT, electromagnetic induction, magnetic resonance coupling, and radio waves which are classified by the distance that sends the power. Magnetic resonance coupling is the method that has been focused on in this paper because of compatibility with short or medium distances as battery chargers which depend on the magnetic field to transfer power without wires that can protect devices from damages and heating. As result the effect of distance on efficiency has been discussed with reached to nearer distance can improve efficiency however by using magnetic resonance technique, acceptable efficiency can be obtained with appropriate distance.

Dalam pengembangan teknologi WPT, Hasan dan Saha (2022) mengembangkan single-phase bidirectional AC-AC Matrix untuk aplikasi WPT. Dalam penelitiannya menjelaskan konverter yang diusulkan digunakan untuk mengubah arus alternating current (AC) 50 Hz secara langsung ke frekuensi tinggi 85 kHz AC tanpa konversi ke direct current (DC). Penjelasan lebih terperinci dapat dilihat pada artikel berikut:

A single-phase bidirectional AC-AC converter with H-bridge energy buffer for wireless power transfer applications

Nazmul Hasan, Tarak Saha

This paper introduces a single-phase bidirectional AC-AC Matrix type converter for wireless power transfer (WPT) applications. The proposed converter converts mains 50 Hz alternating current (AC) directly to high frequency 85 kHz AC without an intermediate direct current (DC) conversion stage. A minimum cost realization of only two bidirectional AC switches comprised each of two semiconductor device and one gate drive signal is employed. The converter operation modes are quantum energy injection and circulating self-oscillation. Elimination of the DC link introduces a sag in the power transfer during the zero crossing of input AC mains, which is well documented in literature. A novel H-bridge buffer structure is introduced which eliminates the power sag by storing energy during mains peak and delivering energy during the zero-crossing period. The converter operates with inherent zero current switching, thus achieving a low switching loss and electro-magnetic interference. The control feature ensures that the converter can be used for both static and dynamic wireless charging applications. The bidirectional power transfer capability ensures that the system can operate in both grid to vehicle (G2V) and vehicle to grid (V2G) power transfer modes. The proposed converter design is analyzed analytically and verified through thorough simulation study.

Beberapa artikel di atas merupakan bagian kecil dari penelitian mengenai teknologi wireless power transfer (WPT). Untuk mendapatkan informasi lebih lanjut, pembaca dapat mengunjungi laman dan membaca artikel secara GRATIS melalui tautan-tautan berikut: https://ijece.iaescore.com/, https://ijeecs.iaescore.com/, dan  https://ijpeds.iaescore.com/.

Redaksi: I. Busthomi