PROJECT TITLE :

Load-Independent Output Voltage Analysis of Multiple-Receiver Wireless Power Transfer System

ABSTRACT:

The frequencies for load-independent output voltage in two-coil and three-coil wireless power transfer (WPT) systems have been studied. But, analysis of load-independent output voltage in multiple-receiver WPT is still lacking in previous studies. This letter investigates the output voltage characteristics of a multiple-receiver WPT system against load variations and determines the operating frequency to achieve a relentless output voltage. Initial, a multiple-receiver WPT system is modeled, and therefore the analytical expression of the basis mean sq. of the output voltage is derived. By substituting the loaded quality factor and the coupling coefficient between every receiver and also the transmitter, we confirm the frequency for load-freelance output voltage in multiple-receiver WPT for the first time. For the given multiple-receiver WPT system, although the load in every receiver is the identical, the coupling coefficient between each receiver and therefore the transmitter can be different. When the coupling coefficients are relatively little, there are 2 frequencies that may achieve load-freelance output voltage. If the coupling coefficients increase and therefore the quadratic total of those coupling coefficients is greater than one, only one frequency will achieve load-freelance output voltage. Theoretical calculations and experimental results make sure these conclusions.