The Wireless Electric Power Transfer System

The equipment powered by built-in batteries has become widespread: unmanned aerial vehicles,portable radios, tactical flashlights, electric vehicles, etc. Charging of batteries is oftencarried out in a contact way – by connecting a power source by means of a detachable connection.This requires the presence of technical personnel for maintenance and replacement of batteries;requires the organization of protection of the battery connection from environmental influences(moisture, dirt, etc.), as well as protection against electric shock to personnel. The purpose of theresearch is to develop technical means of wireless transmission of electrical energy, which willeliminate the use of detachable connections, improve electrical safety, and, most importantly, willmake it possible to make the charging process automatic. The results of the work are relevant forthe implementation of automatic cargo delivery systems using unmanned vehicles; for the implementationof automatic charging systems for urban electric vehicles; for the implementation of automatic charging of unmanned land, floating (including underwater) and aircraft (reconnaissance,patrol, etc.). The design of a wireless power transmission system with a power of up to250 W, suitable for charging 6-cell lithium batteries, is described. The system works with coilswith a diameter of 200 mm, full operability is maintained for a distance between the coils centersup to 100 mm. The efficiency in the entire range of operation modes is not lower than 74%, whenmeasured from the 220 V mains to the output to the battery. When designing, the goal was to minimizethe weight of the receiving part to facilitate its installation on the UAV and minimize theimpact on its thrust-to-weight ratio.