A Review of Wireless Charging in WSN

Wireless energy transfer is the transmission of electrical energy without the use of wires. The use of WET in the management of energy creates a new class of network, i.e., the wireless rechargeable sensor networks. This paper presents a systematic review on wireless charging of sensors nodes in wireless sensor networks and explores the comparison of recognized works. A lot of optimization techniques for designing energy-efficient traveling paths and optimal stopping locations of the WCV has been presented to improve the charging efficiency of WCV. This paper discusses the current work on movement cost of wireless charging vehicles, optimal stopping time of WCV, trajectory design, and conservation of energy. Furthermore, it also enlightens charger placement problems and charge scheduling problems to improve the charging performance of WRSNs. Finally, the research challenges in the field of WRSNs have been proposed.