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@ -229,11 +229,11 @@ differential signal, with both driver outputs being loaded equally across the in
\subsection{Inductive Wireless Power Transfer in Practice}
Inductive WPT has been proposed in a large number of scenarios, each of which comese with a set of
unique constraints. When WPT is used to charge an electric toothbrush, the implementation cost of the system is
critical, while efficiency and total power output are of little concern. Mechanically, in an electric toothbrush's
charging system, the position and spacing of the transmitter and receiver coils can easily be controlled down to
millimeter precision.
Inductive WPT has been proposed in a large number of scenarios\cite{zhangWirelessPowerTransfer2019}, each of which comes
with a set of unique constraints. When WPT is used to charge an electric toothbrush, the implementation cost of the
system is critical, while efficiency and total power output are of little concern. Mechanically, in an electric
toothbrush's charging system, the position and spacing of the transmitter and receiver coils can easily be controlled
down to millimeter precision.
In contrast to this, wireless smartphone charging is a much more demanding application. Here, the total cost of the
system is only secondary, but the receiver's form factor is critical, and total power output as well as efficiency