Page 39 - PEN eBook July 2023
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Power Supply
Many scientific works on this subject have focused only on the optimization of transmitter and/
or receiver modules. Also, WPTS efficiencies are provided as just experimental data without any
preliminary investigation of the silicon devices’ impact on both the primary and secondary sides
of the system. Therefore, the main goal of the research is to provide an effective model for the
analysis and efficiency evaluation of WPTSes, including all the semiconductor device losses for
low-power applications relevant to wearable devices. This article will show an analytical model
based on the first harmonic solution of a WPTS and its solution along with the simulation results
and experimental measurements for a 2-W @ 6.78-MHz WPTS.
WPTS MODELING AND NUMERICAL SOLUTIONS
The WPTS mentioned henceforth refers to the architecture in Figure 1. It can work with a primary
constant frequency and a secondary PWM control ensuring duty-cycle and phase-shift modulation.
The authors aim to calculate the output current (I ) and WPTS efficiency given the output voltage
out
(V ) and the fire angles of the MOSFETs Q , Q , Q and Q .
out 1 2 3 4
Figure 1: Series-series resonant WPTS 1
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