Abstract
In the multi-load wireless power transfer (WPT) system, the output power and transfer efficiency will drop significantly with the change of distance between transmitter and receiver. Power distribution among multiple loads is also a major challenge. In order to solve these problems, a novel multi-load WPT system based on parity–time symmetry (PT-WPT) is proposed in this paper. Firstly, the multi-load PT-WPT system is modeled based on the circuit model. Then, the transmission characteristics of the multi-load PT-WPT system are analyzed. It is found that constant output power with constant transfer efficiency can be maintained against the variation of coupling coefficient, and the power distribution relationship among loads is only related to the coupling coefficient. Further, power distribution under different coupling situations is analyzed in detail to meet different power demands. Finally, taking a dual-load PT-WPT system as an example, the system parameters are designed and the circuit simulation is carried out. The simulation results are consistent with the theoretical analysis, which shows that PT symmetry can be applied to the multi-load WPT system to achieve constant output power, constant transfer efficiency, and power distribution simultaneously.
Highlights
Wireless power transfer (WPT) is a kind of technology that does not need wires or other physical connection and transmits electricity through the air
The main contribution of this paper is to model and analyze the multi-load WPT system based on the parity–time symmetry, which expands the single-load PT-WPT system to a multi-load system
To show the wonderful characteristics of the actual dual-load PT-WPT system, the two receivers are coaxially located on both sides of the transmitter, and the two receiving coils are the same size as the transmitting coil, with a radius of 26 cm
Summary
Wireless power transfer (WPT) is a kind of technology that does not need wires or other physical connection and transmits electricity through the air. WPT systems were proposed to realize omnidirectional wireless charging with two or three orthogonal coils by Lin et al [10,11], Su et al [12], and Han et al [13] These systems can maintain a constant output if the loads rotate around the transmitter at a constant radius. The magnetic field distribution in the metal cavity is not uniform enough, so the output power and efficiency will change with the load position. Another important technology is the power distribution among multiple loads, because different loads have different power demands.
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