TY - GEN
T1 - Flexible solar-energy harvesting system on plastic with thin-film LC oscillators operating above ft for inductively-coupled power delivery
AU - Hu, Yingzhe
AU - Rieutort-Louis, Warren
AU - Huang, Liechao
AU - Sanz-Robinson, Josue
AU - Wagner, Sigurd
AU - Sturm, James C.
AU - Verma, Naveen
PY - 2012
Y1 - 2012
N2 - This paper presents an energy-harvesting system consisting of amorphous-silicon (a-Si) solar cells and thin-film-transistor (TFT) power circuits on plastic. Along with patterned planar inductors, the TFTs realize an LC-oscillator that provides power inversion of the DC solar-module output, enabling a low-cost sheet for inductively-coupled wireless charging of devices. Despite the low performance of the TFTs (ft=1.3MHz at a voltage of 15V), the oscillator can operate above 2MHz by incorporating the device parasitics into the resonant tank. This enables increased quality factor for the planar inductors, improving the power-transfer efficiency and the power delivered. With 3cm-radius single- and double-layer inductors, the system achieves 22.6% and 31% power-transfer efficiency (approaching the analytically-predicted bound), while the power delivered is 20mW and 22mW.
AB - This paper presents an energy-harvesting system consisting of amorphous-silicon (a-Si) solar cells and thin-film-transistor (TFT) power circuits on plastic. Along with patterned planar inductors, the TFTs realize an LC-oscillator that provides power inversion of the DC solar-module output, enabling a low-cost sheet for inductively-coupled wireless charging of devices. Despite the low performance of the TFTs (ft=1.3MHz at a voltage of 15V), the oscillator can operate above 2MHz by incorporating the device parasitics into the resonant tank. This enables increased quality factor for the planar inductors, improving the power-transfer efficiency and the power delivered. With 3cm-radius single- and double-layer inductors, the system achieves 22.6% and 31% power-transfer efficiency (approaching the analytically-predicted bound), while the power delivered is 20mW and 22mW.
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U2 - 10.1109/CICC.2012.6330627
DO - 10.1109/CICC.2012.6330627
M3 - Conference contribution
AN - SCOPUS:84869424207
SN - 9781467315555
T3 - Proceedings of the Custom Integrated Circuits Conference
BT - Proceedings of the IEEE 2012 Custom Integrated Circuits Conference, CICC 2012
T2 - 34th Annual Custom Integrated Circuits Conference, CICC 2012
Y2 - 9 September 2012 through 12 September 2012
ER -