Structure and Circuit Solution of a Bidirectional Wireless Power Transmission System in Applied Robotics

Abstract

In this paper the development of structure and circuit solution for a bidirectional wireless power transmission system is presented, based on current fed push-pull inverter. Existing solutions are analyzed, as well their structures and characteristics. The principle of operation of the developed circuit solution is described in receiving/transmitting mode, an electrical principal circuit is given with respective ratios calculated. The SPICE modeling of the system was performed, and the theoretically calculated dependency of energy transmission efficiency from the transmitted power was obtained. The developed structure includes a step-up DC-DC converter, which enables to obtain the output voltage of the system, active in receiving mode, being equal or higher than the voltage of the power supply of energy-transmitting system. Therefore, the proposed bidirectional wireless power transmitting system can be utilized within a swarm robotic system with unified robots, having identical power supply batteries. Practical application of the proposed solution is relevant for energy transmission among autonomous robots, energy transmission from power supply source to robot and in reverse direction.