Multiple User MPT System Based on the Different Time Division Assignment (DTDA)

MPT is a kind of WPT, which uses the antenna and microwave RF technology to transfer the power into the power receiver. Different from CDMA system, the wireless power transfer cannot be controlled because of the very low power efficiency. Only possible power transmission into the multiple user is based on the time division method with the maximum transmission power. So, in this paper, an efficient wireless power transmission system to multiple power receiver users based on the power pilot signal is suggested to satisfy the urgent power receiver and normal power receiver, together, which is a different time division assignment (DTDA) system in this paper. The power pilot signal transmits the authorized user information and the user's power level status information to the power transmission station. The power station transmits the wireless power to the user of the lowest power level in the first order and for the longest time. For the user identification of multiple users, the CDMA system is used, and the DTDA system is used to allocate power charging time differently to each user. This is meaningful in that power transmission is performed according to the power priority to multiple users. Finally, the power efficiency of the PLL-based RDA system is increased by conjugating the phase of the power pilot signal received from the user and transmitting it to the user. We like to propose these three systems and evaluate the performance through simulation by constructing the DTDA wireless power transmission system for supporting multiple users.