• Kausalya. B. Salunkhe
• Dr. Parul Arora
• Dr. Yogeshkumar sharma

Battery back-up gadgets are having unique technological challenges like increased cost, high weight and minute density of power. The battery charging time of the Smartphone has become a challenge because of the increased use of electricity due to the complexities of complex multimedia signal processing requirement. One excellent solution is wireless power transfer (WPT) in which the battery is charged over the air.WPT is more convenient over traditional energy supply as it not bother of connecting wires and replacing batteries. It offers required uninterrupted power supply, so it reduces the cost of the battery. No need for battery disposal hence environmental friendly. In this paper, we present a general idea of WPT technology that is emphasized in basic WPT technology, its types, and applications. Then we discuss the comparison between different wireless charging techniques i.e., inductive and capacitive coupling, magnetic resonance coupling, microwave, and lightwave transmission.

Wireless charger, near field capacitive coupling (NCC), Wireless power transfer (WPT), PoWiFi, Wireless-Powered Sensor Network (WPSN).

"Different Techniques and Algorithms used in Wireless Power Transfer: A survey", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.92-98, June 2019, Available :http://www.jetir.org/papers/JETIR1906J98.pdf

"Different Techniques and Algorithms used in Wireless Power Transfer: A survey", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp92-98, June 2019, Available at : http://www.jetir.org/papers/JETIR1906J98.pdf