Efficiency and Output Power Sensitivity to Control Parameter Variations in an LCC-Series Wireless Power Transfer System

In wireless power transfer (WPT) systems, output power
$(P_{out})$
can be controlled through input parameters such as, input voltage
$(V_{in})$
, duty cycle
$(d)$
, and switching frequency
$(f_{sw})$
. The impact of these control parameters on the overall system efficiency has not been explored in previous studies. This paper focuses on the efficiency
$(\eta)$
and
$P_{out}$
sensitivity to these control parameter variations in an LCC-Series tuned WPT system. There are multiple combinations of
$V_{in},\ d$
, and
$f_{sw}$
that can achieve a specified target
$P_{out}$
. However, it is important to determine the optimal combination of these control variables that will yield the maximum
$\eta$
for a target
$P_{out}$
. A MATLAB/Simulink model is built to calculate and measure
$\eta$
and
$P_{out}$
. In order to achieve this result, several simulations are run where
$V_{in},d$
, and
$f_{sw}$
are swept across a wide range to cover all possible combinations. MATLAB's Sensitivity Analysis toolbox is used to evaluate how the parameters influence the model's output. Finally, an experimental prototype is implemented. The optimal values acquired using the sensitivity analysis is then plugged into the hardware prototype and compared with the simulation. The results obtained confirm the validity of the proposed method.