Greetings, fellow Nawala! May you always be in good health.
This is the IAES Nawala of the Institute of Advanced Engineering and Science. Today we will share news about wireless power transfer (WPT) technology. WPT is a technology that allows electrical energy to be transmitted from a source to an electronic device without the need for wires or electrical connections. This technology is based on the principles of electromagnetic fields and resonance coupling. Yamaguchi et al. (2023) conducted an experimental review on WPT improvisation using auto tuning. The full results can be seen in the following article:
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.
Frequency auto-tuning in WPT refers to the ability of the system to automatically adjust the operating frequency to optimize power transfer efficiency. Yamaguchi and Iida (2022) also implemented auto tuning in electric vehicles. The results of their implementation can be seen in the following article:
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 is a WPT technology that utilizes the principles of electromagnetic resonance to efficiently transmit electrical energy between a transmitter coil and a receiver coil. This technology is particularly relevant in applications that require longer distances between coils and higher power transfer rates compared to traditional inductive coupling methods. Nafiaa and Zuheer Yonis (2022) developed magnetic resonance coupling for environmentally friendly technology. The results of their research can be seen in the following article:
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.
In the development of WPT technology, Hasan and Saha (2022) developed a single-phase bidirectional AC-AC Matrix for WPT applications. In their research, they explained that the proposed converter is used to convert 50 Hz alternating current (AC) directly to 85 kHz high frequency AC without conversion to direct current (DC). A more detailed explanation can be seen in the following article:
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.
The above articles are a small part of the research on wireless power transfer (WPT) technology. To get more information, readers can visit the page and read articles for FREE through the following links: https://ijece.iaescore.com/, https://ijeecs.iaescore.com/, dan https://ijpeds.iaescore.com/.
By: I. Busthomi