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Low loss magnetic design for wireless power transfer
(2015-10-01)
Zenkner, Heinz
;
Khan-Ngern, Werachet
An electromagnetically power transmission system to transmit power at a high power density and with a high efficiency under consideration of EMC aspects is proposed. Product requirements like size and weight are taken into account. The system uses the resonance wave coupling and an impedance adaption for multi-stage conversion is implemented to optimize efficiency and impedance matching. The transferred power is up to 180 W at a frequency of 6.78 MHz with a distance between 30 mm and 80 mm. The results show that an efficiency up to 88% can be achieved. The transmitted power density reaches up to 14 W/cm<sup>2</sup>. It is shown that due to the evanescent wave resonance coupling the system emits only very little radiation and thus is capable to keep EMC/EMF regulations. Wireless power transfer applications such as electric vehicle charging and wireless power drive for LED lighting through a wall are demonstrated.
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The study of wireless power transmission under water-to-air mode
(2015-10-01)
Khan-Ngern, Werachet
;
Zenkner, Heinz
This research proposes the preliminary study whether the power transmission is possible or not. The wireless power transmission using particular resonance technique with series resonance for transmission and parallel resonance for receiver has been proposed. The study is focused on the wireless power transmission on waterto- air mode on reversed osmosis water and various salt water concentrations. The transmitted power is up to 7 W at a frequency of 6.78 MHz across a distance in the range between 10 mm to 60 mm has been demonstrated. Finally, the effect of water type and the percentage of salt concentration on wireless power transmission attenuation are presented and analyzed.
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Short range wireless power charging on small electric vehicles
(2014-12-23)
Khan-Ngern, Werachet
;
Zenkner, Heinz
This paper presents the research work focusing on charging the energy via the air to a small electric vehicle (EV). This work shows not only the possibility of wireless power charging, but also the electromagnetic compatibility (EM C) issue is taken into account. The charging system is described and set up using the resonance coupling effect and single-ended primary-inductor converter (SEPIC) for a low DC power charging The transmitting power is applied at a frequency of 6.78 M Hz across a gap in the short range between 100 mm to 200 mm The experimental results show that the maximum efficiency up to 80 % were acheived to charge to a three wheel electric scooter 36 V system up to 14 W. The wireless char ging has been studied on radiated emission during charging mode at transmitter, receivers and at the gap between transmitter and receiver.
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Wireless power charging on electric vehicles
(2014-10-15)
Khan-Ngern, Werachet
;
Zenkner, Heinz
This paper presents wireless power charging to a electric vehicle (EV) focusing on resonant topology. The charging system is described and set up using the resonance coupling effect and single-ended primary-inductor converter (SEPIC) for a low DC charging. The transmitting power is applied at a frequency of 6.78 MHz across a gap in the short range between 10 cm to 20 cm. The experimental results show that the maximum efficiency up to 80 % from transmitter to receiver. The EV charging using wireless charging has been confirmed with park and ride demonstration at 10 W power charging scale. The real time of wireless power charging can be monitored via Zigbee system. This work shows not only the possibility of wireless power charging, but also the electromagnetic compatibility (EMC) issue is taken into account.

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