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Recently, high density integrated circuits are packaged in the electronic devices such as smartphones and smartwatches. Power amplifier modules integrated in such devices interact with other circuits due to its inductive components, and may cause the electromagnetic interference issues. To reduce the electromagnetic issues, sputtering technology can be used. In this paper, we present the shielding...
Because wireless power transfer (WPT) systems used in automotive vehicles are likely to cause electromagnetic interference (EMI) with sensors, antennas, and controllers, the magnetic near-field spectrum from a WPT system has to be investigated and controlled properly. In this paper, we propose a selective harmonic elimination (SHE) method of the radiation noise from an automotive WPT system to reduce...
Wireless power transfer (WPT) technology is an electrically safe and convenient method of charging batteries. WPT technology allows elimination of exposed contacts, which can cause direct electrocution of human. In spite of the great advantages, the WPT system inevitably generates strong electromagnetic fields (EMFs), causing interference on the nearby electrical devices as well as harmful influence...
Wireless power transfer (WPT) charging technology using magnetic field can transfer power to battery for drone without any electrical contact. It can be one of the safe and convenient battery charging methods. In spite of the great advantages, WPT system generates strong electromagnetic fields (EMFs), which causes interference on the electrical devices such as DGPS, speed controller, Bluetooth data...
In this paper, we propose electromagnetic interference (EMI) reduction method in tightly-coupled resonant magnetic field automotive charger. The main technique for reducing EMI is input impedance design based on theoretical analysis of tightly coupled wireless power transfer (WPT) circuit. In order to design input impedance of the tightly coupled WPT circuit, the characteristics of the magnitude of...
Wireless power transfer (WPT) technology enables convenient and automatic battery charging for drone. In spite of the great advantages, WPT system inevitably generates strong electromagnetic fields (EMFs), which causes interference on the nearby electrical devices. In order to reduce the effects of magnetic near-field noise and losses, a reduction in the harmonics of the source current is required...
The output voltage and current from dc-ac inverter generate switching noises and may cause electromagnetic interference (EMI) problems to other electronic systems. To analyze high frequency switching behavior of an inverter accurately, an accurate IGBT model is essential. In this study, an insulated gate bipolar transistor (IGBT) is modeled using datasheet and measurement data to analyze the high...
In this paper, the equivalent circuit model of the return paths of common mode electromagnetic interference (EMI) noise currents from the motor drive system (MDS) in hybrid electric vehicle (HEV) is proposed. The proposed model includes three kinds of the return current paths: braided shield of three-phase cable, metallic vehicle body and the parasitic capacitance between the vehicle components. In...
Wireless power transfer (WPT) technology enables convenient and automatic battery charging for unmanned aerial vehicles (UAVs). However, in WPT charging systems, strong electromagnetic fields (EMFs) are inevitably generated and the power source contains a wide range of harmonics. In this paper, we propose an automated resonant wireless power transfer charger for UAV with three-phase magnetic field...
This paper briefly overviews the design considerations, related equations and conditions for the magnetically coupled coils having low leakage magnetic fields and high efficiency. As a design example, a coil design for 1kW-class wireless charging system for compact EV is presented and validated via measurement.
Wireless power transfer (WPT) technology is becoming increasingly popular for wireless charging of mobile phones and electrical vehicles. Because high power energy is transferred via air, however, the problem of electromagnetic radiated emission from WPT systems is expected to be serious. In this paper, an electromagnetic interface (EMI) and radiation from WPT systems are discussed. Three example...
In this paper, we present the analysis of electromagnetic interference (EMI) shielding effects of wireless power transfer (WPT) using magnetic resonance coupling for board-to-board level interconnection. Board-to-board WPT consists of source coil, receiver coil, and load which are manufactured on printed circuit board (PCB). The coil is expressed as a simple equivalent circuit model, of which the...
Recently, KAIST has introduced the novel on-line electric vehicle (OLEV), in which the automotive vehicle constantly receive and recharge their power from the power lines embedded underneath the surface of the road. OLEV has the reduced battery capacity to about 20% compared to that of the conventional battery-powered electric vehicles, while it can consequently minimize the weight and the price of...
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