Research of the Laboratory Prototype for the Battery Charging System Based on Wireless Power Transfer

On the possibility of wireless battery charging in a gaseous-and-dusty mine

“…Depending on the configuration of the high-frequency resonant converter, the energy losses and the coupling coefficient will be different and the skin effect or other negative phenomena will manifest to a greater or lesser extent [13]. In normal operating mode, the wireless charger with optimized geometric and design parameters has more than 90% of efficiency [14]. However, the efficiency of wireless power transfer will drop off if the distance between the coils or their relative position change more than permissible, or if a foreign metal object appears between the coils.…”

“…In this case, since a hazardous explosive atmosphere inside the elements of the system is possible, the secondary side and the rectifier, as well as the primary side and the inverter, must be placed in a flameproof enclosure "d". However, this type of explosion protection is not suitable for the transmitting and receiving coils, since according to [14], the presence of metal sheets between the coils reduces the efficiency of wireless power transfer to almost zero. Concurrently the same research shows that the presence of E3S Web of Conferences 303, Clean Coal Technologies: Mining, Processing, Safety, and Ecology 2021 dielectric panels between the coils reduces the efficiency insignificantly, therefore, it is possible to use explosion protection by encapsulation "m" for the coils.…”