At the receiving part of the coupling coils, a rectifier is used
to convert AC power to DC. Usually, a full-bridge topology
is used. However, most high power diodes are incapable in
a 13.56 MHz system because of their low switching speed.
In this paper, SiC diodes (STPSC406) are used to build a
full-bridge rectifier with ceramic capacitors as the low-pass
filter. The design target here is to find the optimum value
of the rectifier load (RL in Fig. 1) which minimizes the
power reflection. Because of the non-linearity of the diodes, it
is difficult to derive the system transfer characteristics like
the coupling system. Instead, the rectifier is analyzed in a
commercially available simulation package, Advance Design
System (ADS) by Agilent Technologies.
By sweeping the load resistance in Fig. 5, the system
efficiency curve and power reflection coefficient are plotted
in Fig. 6. The simulation results show that when the load