Flexible solar-energy harvesting system on plastic with thin-film LC oscillators operating above ft for inductively-coupled power delivery
نویسندگان
چکیده
This paper presents an energy-harvesting system consisting of amorphous-silicon (a-Si) solar cells and thinfilm-transistor (TFT) power circuits on plastic. Along with patterned planar inductors, the TFTs realize an LCoscillator that provides power inversion of the DC solarmodule output, enabling a low-cost sheet for inductivelycoupled wireless charging of devices. Despite the low performance of the TFTs ( =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 singleand double-layer inductors, the system achieves 22.6% and 31% powertransfer efficiency (approaching the analytically-predicted bound), while the power delivered is 20mW and 22mW.
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