Abstract
Wireless Power Transfer (WPT) has been the research focus and applied in many fields. Normally power is transferred wirelessly to charge the battery, which requires specific load characteristics. The load characteristics are essential for the design and operation of the WPT system. This paper investigates the load characteristics of the WPT system with different resonant types and resonator numbers. It is found that in a WPT system with series or LCL resonance under a constant voltage source, the load characteristic is determined by the number of inductors. Even number of inductors results in a constant current characteristic and odd number constant voltage characteristic. Calculations, simulations, and experiments verify the analysis.
Highlights
Wireless power transfer (WPT) has received intense research attention in the last decade.[1]
The load currents of the S-S and LCL-LCL topologies are constant while the load voltages of the S-LCL and LCL-S topologies are constant
For a constant voltage power supply, the load current is constant with an even number of inductors, while the load voltage is constant with an odd number of inductors
Summary
Wireless power transfer (WPT) has received intense research attention in the last decade.[1]. An extra inductor is added to form an LCL topology to be connected to the voltage source. These two different resonant types[6] result in different load characteristics. To extend the transfer distance, relay resonators are utilized in the WPT system.[7,8] The load characteristics of the WPT system with different relay resonator numbers under different resonant types are not fully explored yet.
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