500 kHz Zero Voltage Switching (ZVS) of Class E Inductive Power Transfer (IPT)-based for Toy Drone Charging System

This paper comprehensively studies an inductive power transfer (IPT) -based toy drone charging system. The main issue of toy drones are limited flight time and battery capacity. Due to this, it has motivated us to propose a portable charging system to power up the battery of a toy drone wirelessly. The Class-E circuit is designed with a single-power MOSFET switch and load network to efficiently drive high-frequency alternating current (AC) with minimal switching losses. Utilizing an Arduino board to generate a pulse width modulation (PWM) switching signal, the impact of the PWM device on the Class-E circuit's switching performance at 500 kHz was explored. The analysis encompasses the performance of the Class-E circuit in terms of Zero Voltage Switching (ZVS) and output load. The findings revealed that the PWM waveform from Arduino achieves an approximately 50% duty cycle and enables optimal ZVS of the Class-E circuit. Consequently, the MOSFET is activated during the minimum voltage across its drain and source, thereby minimizing switching losses. As a result, the potential application of a Class-E circuit in energizing the transmitter coil for the toy drone was observed.