Temperature Sensing System With Short-Range Wireless Sensor Based on Inductive Coupling

Output Power Limit in Energy Harvesting Systems Based on Magnetic Induction Incorporating High-Frequency Effects

“…A numerical simulation was conducted to examine the above results. Figure 3 shows the time-average output power P out /B 2 for four coils with CF ranging from 10 to 10,000 mm 1.25 (here, r av and d w are given in mm just for convenience; however, in (22)- (26), the units of CF must be consistent with other parameters in the expression). The four colored solid lines represent the power when accounting for skin effect and radiation resistance, but with no proximity effect (k prox = 1).…”

“…Due to the large number of radial layers, the proximity effect causes major power degradation (k prox_max~6 13), as illustrated by the existing gap between the two blue lines. are given in mm just for convenience; however, in (22)(23)(24)(25)(26), the units of CF must be consistent with other parameters in the expression). The four colored solid lines represent the power when accounting for skin effect and radiation resistance, but with no proximity effect (kprox=1).…”

“…From (25) and (26), it is observed that large coils are more potent than small ones, yet reach their ultimate power at a lower frequency.…”

“…The source of the magnetic flux can be power lines [3][4][5][6][7][8][9][10], oscillating or vibrating permanent magnets [11][12][13][14][15][16][17][18][19][20][21][22][23][24], variable reluctance [25] or a nearby transmitter coil. Typical applications are condition monitoring sensors powered by power lines [3][4][5][6][7]9,[26][27][28], and powering of biomedical implants [2,14,17,[29][30][31][32]. In general, the goal is to maximize the output power for a given ambient oscillating magnetic field, i.e., maximize P out /B 2 , whereas the particular design challenges vary according to the system constraints [12,26,[32][33][34].…”

“…Typical applications are condition monitoring sensors powered by power lines [3][4][5][6][7]9,[26][27][28], and powering of biomedical implants [2,14,17,[29][30][31][32]. In general, the goal is to maximize the output power for a given ambient oscillating magnetic field, i.e., maximize P out /B 2 , whereas the particular design challenges vary according to the system constraints [12,26,[32][33][34]. Reference [32] is a book dedicated entirely to wireless power transfer for medical microsystems, which describes with great details the various aspects of the design, including the antenna and the power electronics.…”