Abstract
This paper proposes a multiple-receiver inductive power transfer platform which is capable of controlling the load voltages to satisfy individually rated values and stabilizing the load voltages against the load variations. In the proposed charging platform, multiple transmitting resonators are employed to support a voltage-driven source resonator in manipulating the energy flows toward individual receivers. This structure also helps the voltage source induce constant currents into the transmitting resonators, and therefore, is able to deliver load-independent voltages to the loads. As a result, when the loads are sufficiently large, the load voltage ratio is approximately determined only by the mutual couplings of the coils. This means that the voltage control can be performed by effortlessly adjusting the arrangement of the transmitting resonators inside the charging platform. Electromagnetic simulation and experiment results verify voltage stability and controllability of the proposed system. Although typical constant voltage designs inevitably suffer from efficiency degradation, our scheme can achieve an efficiency of up to 56°, which is acceptable and sufficient for many practical applications.
Highlights
This paper has proposed an inductive power transfer (IPT) platform consisting of one source resonator and multiple transmitting resonators to control and stabilize the load voltages for multiple-receiver charging applications
We have shown that when the load resistances are sufficiently large, the load voltages and their ratio are stable against load variations and only depend on the mutual inductances of the coils
This suggested that the load voltage control could be carried by effortlessly adjusting arrangement of the transmitting coils inside the charging platform
Summary
Given certain positions of the receivers, changing the arrangement of the transmitting resonators inside the charging platform brings about changes in the mutual inductances Lst and Lrt, which will in turn change the value of the load voltage ratio. 2) When the system consists of larger number of transmitting and receiving resonators, it is more difficult for the load voltages to reach the stable values.
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