A Frequency-Tracking and Impedance-Matching Combined System for Robust Wireless Power Transfer

Figure 11

Comparison of three kinds of WPT systems. S1: the original WPT system; S2: the dual-side impedance-matching WPT system; S3: the frequency-tracking and impedance-matching combined WPT system. (a) Power transmission efficiency versus load resistance. (b) Output power versus load resistance.

(a)

(b)