437641.fig.007a
(a)
437641.fig.007b
(b)
Figure 7: (a) The percentage for various sunlight conditions with the fixed pumping frequencies of 7 MHz and 15 MHz and the VPF scheme. Here MPP means the simulated maximum output currents. (b) The output current comparison between the proposed VPF scheme and the simulated maximum output currents (MPP).