A Gain Boosting Array Technique for Weakly-Coupled Wireless Power Transfer

Optimal precoder design for wireless communication and power transfer from distributed arrays

“…Table 4.4: Measurements with four-transmitters when single coil is excited As a result of strong coupling between transmit coils 3 and 4 to the receive coil 1, the optimal solution is heavily weighted to these two coils. The maximum achievable efficiency is 19.1% which is significantly better than 14.1% efficiency obtained by using the well-known method of equal power beamforming [42] and marginally better The above intuitive interpretation is also supported by our experimental results. When we attempt to transmit power to receiver 1, the receiver 2 acts as a parasitic loss element.…”

“…First, we conducted a number of simple experiments involving two transmitter coils and a single receiver coil to validate our approach and later, we performed a macro scale experiment involving four transmit coils and two receiver coils to analyze the optimal solution and the gains we expect as compared to other known methods in the literature, especially, the equal power beamforming solution which is widely used [42]. Repeat steps 1,2 for all transmit coils by exciting one coil at a time.…”

“…1. Equal power beamforming: This is the most widely used method in the literature on WPT systems with multiple transmitters [42] in which the phase of the excitation current is chosen to be the negative of the phase of the transgain at each transmitter. This choice of current excitation ensures that the contributions from each transmitter to the total load current are aligned in phase and thus add up coherently.…”

Magnetically Coupled Resonance WPT: Review of Compensation Topologies, Resonator Structures with Misalignment, and EMI Diagnostics

“…A WPT system that consists of a single transmitter and multiple receivers is investigated [32], and considered the influence of load and mutual inductance (the position of receivers) on the efficiency. A multi-coil transmitter array is employed to boost the power gain, which in turn allowed the application of very small receivers at a quite far distance [77]. A power transfer from a single source coil to multiple receivers through MCR WPT was demonstrated [162].…”

“…Most of the presented CPT systems are designed for low-power applications, including USB devices, lamps, and small robots [8,[65][66][67][68][69][70][71][72][73], where the transmitting distance is limited to the millimeter range. High efficiency is provided by MCR WPT for a longer transferring distance [23,34,[74][75][76][77][78][79][80][81][82].…”