Near Field WPT Charging a Smart Device Based on IoT Applications

Abstract
Near-field wireless power transfers (WPTs) have seen major developments in recent years due to
the increasing popularity and availability of smart devices for the Internet of Things (IoT)
applications. To improve the power transfer energy (PTE) and transfer distance for charging smart
mobile phones based on MRC by designing a copper wire coil to solve the air gap problem
between the transmitter and receiver coils. As an energy-harvesting technique based on magnetic
resonator coupling (MRC), WPT can charge batteries in smart devices, especially in mobile IoT
devices where changing the batteries can be inconvenient. In this study, the multi-different copper
wire coil (MDCWC) cover shield and double-receiver copper wire coil (DRCWC) systems were
proposed to deliver power to devices with low-power consumption with a P-P topology using a
Royer oscillator in one important scenario. The design scenario was implemented using the
MDCWC in the transmitting and receiving circuits. However, three loads were used to test the
performance metrics of the system, namely, 20, 50, and 100 Ω for home appliances. To achieve
the aim, two near-field WPT techniques a DRCWC and MDCWC were designed and developed.
An MDCWC having a covered copper wire coil design improved transfer power to 5.04 W and
efficiency to 84% at 20 mm with a 100 Ω loaded systemin alignment condition. The results
revealed that the coil geometry contributed to improving the performance metrics in terms of
transfer power efficiency and transfer distance. The corresponding transfer power and efficiency
values for the MDCWC were 5.04 W and 84% at 20 mm, 4.2 W and 70% at 60 mm, and 3.02 W
and 50.37% at 150 mm, respectively, whereas the theoretical result of the transfer efficiency was
96%. However, the theoretical and experimental studies proved that the DRCWC prototype could
be used to charge cell phones with a maximum air-gap range of 10 to 300 mm between the
transmitter and receiver coils. Lastly, it should be noted that the proposed system can charge one
device.

DOI: Near Field WPT Charging a Smart Device Based on IoT Applications

Aqeel Mahmood Jawad

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