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. 2015 Sep 25;3(1):1500255. doi: 10.1002/advs.201500255

Figure 6.

Figure 6

Improvement of the power utilization efficiency by impedance match. a) Variation of current and power of the TENG with the external resistance. b) Bode plot of impedances of an LFP–LTO full cell at discharged state. The inset in (b) is the equivalent circuit of the battery cell. c) The equivalent circuit of battery charging by the TENG with the aid of a transformer and a rectifier. d) The effect of the transformer coil ratio on matched impedances of the TENG, and the power utilization efficiency of the TENG at 250 rpm when charging an LFP–LTO full cell.