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Output Voltage Feedback Control Method for Series-Series Compensated Inductive Wireless Power Transfer Link with Varying Primary Capacitor

Constant voltage output is often desirable in applications concerning inductive wireless power transfer systems. In these applications there is often misalignment and variance in distance between the transmitter and receiver sides which has an effect on the coupling coefficient between the transmitter and receiver sides This forces the system to operate in a range of coupling coefficients rather than a single working point and leads to the need for more robust system to be developed. This paper introduces a series-series (S-S) compensated inductive wireless power transfer (WPT) link with closed loop variable primary capacitor output voltage control in order to address the above issues. Theoretical basis is derived and proof of concept is done in simulation.