Design of Light-Controlled Dual-Band Magnetic Resonant Wireless Power Transfer System

Wireless Power Transfer (WPT) is an emerging technology that enables the transmission of electrical energy from a source to receiving devices without the necessity of physical conductors. This paper presents a Magnetic Resonant Wireless Power Transfer (MR-WPT) system with remote control capability using light. Light at a wavelength of 650 nm is employed to activate a photodiode placed on both the transmitter and receiver of the MR-WPT system. Depending on the active and inactive states of the incident light, the transmitter and receiver operate at different frequencies through a frequency control circuit embedded in the backside of resonators. This control circuit allows the MR-WPT system to function at two frequency bands, 13.0 MHz and 13.56 MHz, corresponding to the presence or absence of incident light, respectively. Simulations have been conducted to verify and elucidate the energy transfer mechanism and switching capability of the proposed MR-WPT system. Measurements indicate that at a transmission distance of 50 mm, the MR-WPT system achieves transmission coefficients of 0.74 at 13.0 MHz and 0.75 at 13.56 MHz. The results demonstrate that the MR-WPT system can operate efficiently with high performance across two different frequency bands, featuring a flexible remote control enabled by light.