Design of new wireless power transmission device based on PWM control IC SG3525

A wireless power transmission device consists of a transmitting module and a receiving module. Unlike most wireless power transmission researches, this paper based on the research that adopts the 15-volt direct-current power as its auxiliary power, and inversion efficiency is also considered in relation to system transmission efficiency. The research made the best of Control IC SG3525 in inversion situation and avoided the complicated software debugging happened during the process of PWM control. The research has finished the construction and debugging of the hardware circuit and has achieved satisfactory results. The transmitting coil turns and diameter are set the same as those of receiving coil, and the coil in transmitting module are parallel placed with that in receiving module. PWM wave is produced from SG3525 in transmitting module, hence PWM wave frequency could be the same as resonance frequency in transmitting and receiving circuit through adjusting peripheral resistance around SG3525, and the strongest magnetic filed is generated between the coils. Accordingly, the distance of energy transmitting could be increased with improved transmitting efficiency. We collected the data of the hardware under the condition of keeping the frequency fixed but changing the distance and vice versa in order to study the influence of transmitting distance and frequency on transmitting power, receiving power and transmitting efficiency.