TY - GEN
T1 - Design of high efficiency wireless charging pad based on magnetic resonance coupling
AU - Choi, Jinsung
AU - Ryu, Young Ho
AU - Kim, Dongzo
AU - Kim, Nam Yoon
AU - Yoon, Changwook
AU - Park, Yun Kwon
AU - Kwon, Sangwook
AU - Yang, Youngoo
PY - 2012
Y1 - 2012
N2 - In this paper, a design of wireless power charging pad based on magnetic resonance coupling is introduced. For highly efficient operation of the overall charging pad system, the efficiency of RF TX is very important so that the 6.78MHz, 30W, 91% class-E power amplifier (PA) is designed and the power tracking technique, whose function is easily embedded in the AC-to-DC power converter conventionally used for consumer electronics, is applied for the power control. Compared to the conventional approach employing the additional DC-to-DC converter for the power control, it presents maximally 20% higher efficiency over the wide output power region. To charge various mobile devices on a single 320×220mm2 TX pad, a uniform field resonator is designed. The receiving unit consists of a general full-bridge rectifier and a 5V DC-DC converter coupled to the internal battery charger in the mobile device. The overall AC60Hz-to-DCLoad efficiency of the implemented wireless power charging pad is 42-51% for various charging conditions; from single device to multiple devices of Samsung Galaxy-S2, Galaxy-Tab7, and NX-100 Digital Camera. The DC-to-DC efficiencies, generally used term to present the system efficiency, are higher than 60% for the whole cases.
AB - In this paper, a design of wireless power charging pad based on magnetic resonance coupling is introduced. For highly efficient operation of the overall charging pad system, the efficiency of RF TX is very important so that the 6.78MHz, 30W, 91% class-E power amplifier (PA) is designed and the power tracking technique, whose function is easily embedded in the AC-to-DC power converter conventionally used for consumer electronics, is applied for the power control. Compared to the conventional approach employing the additional DC-to-DC converter for the power control, it presents maximally 20% higher efficiency over the wide output power region. To charge various mobile devices on a single 320×220mm2 TX pad, a uniform field resonator is designed. The receiving unit consists of a general full-bridge rectifier and a 5V DC-DC converter coupled to the internal battery charger in the mobile device. The overall AC60Hz-to-DCLoad efficiency of the implemented wireless power charging pad is 42-51% for various charging conditions; from single device to multiple devices of Samsung Galaxy-S2, Galaxy-Tab7, and NX-100 Digital Camera. The DC-to-DC efficiencies, generally used term to present the system efficiency, are higher than 60% for the whole cases.
KW - charging pad
KW - multiple charging
KW - power control
KW - resonance
KW - RF power amplifier
KW - Wireless power transmission
UR - https://www.scopus.com/pages/publications/84874448683
M3 - Conference contribution
AN - SCOPUS:84874448683
SN - 9782874870293
T3 - European Microwave Week 2012: "Space for Microwaves", EuMW 2012, Conference Proceedings - 9th European Radar Conference, EuRAD 2012
SP - 590
EP - 593
BT - European Microwave Week 2012
T2 - 2012 9th European Radar Conference, EuRAD 2012 - Held as Part of 15th European Microwave Week, EuMW 2012
Y2 - 31 October 2012 through 2 November 2012
ER -
