A 70-to-2 V Triboelectric Energy Harvesting System Utilizing Parallel-SSHI Rectifier and DC-DC Converters. - Ismail Kara; Mustafa Becermis; Mohamed Abdel-Aal Kamar; Mustafa Aktan; Hakan Dogan; Senol Mutlu (IEEE Trans. Circuits Syst. I Regul. Pap., 2021)