Environmental Engineering Reference
In-Depth Information
As compared to the experiment conducted in Section 6.2.4 where one pair
of transmitting and receiving coils was used, it was observed that if an addi-
tional resonating coil (i.e., resonator #1) was placed between the transmitting
and receiving coils, the transmission range of the WPT system increased from
20 to 60 cm. Referring to
Figure 6.27
, it can be observed that the intermediate
resonator coil #1 acted as a source for the next resonator coil #2 as well as a
relay energy source for the subsequent resonator coils. Although more res-
onator coils were used to extend the wireless power transmission distance, the
optimal design of the WPT system should take note of the additional ohmic
loss in each hop. Hence, the experiment successfully demonstrated that a
network of resonator coils can be used to transfer electrical power efficiently
over a larger wireless transmission range to meet the target application.
6.2.5
Summary
The concept of using self-resonant coils operating in the strongly coupled
regime was experimentally demonstrated. It is obvious that this process was
far superior to simple inductive coupling. The equations and theory behind
the concept were analyzed, and further derivations and simulations helped
in designing the appropriate system. Various design factors, such as resonant
frequency, load, and distance, were changed and subjected to experiments.
The results obtained were consistent with the derived equations and simu-
lations. Experimental results showed that an electrical output power of 1 W
was successfully delivered to the load, which was a lightbulb at an efficiency
of 51% at a 20-cm coil separation distance with coils of 7.5-cm radius.
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