Experimental verifications and desing procedure of an AC-DC converter with input impedance matching for wireless power transfer systems

An AC-DC converter with an input impedance matching for the receiving side of wireless power transfer (WPT) systems is mentioned in this paper. WPT systems are desired to operate in high frequency such as 13.56 MHz. In the high-frequency region, input impedance of the AC-DC converter on the receiving side of the WPT systems should be matched to the characteristic impedance of a transmission line because reflected power decreases the transmission efficiency of WPT systems. In this paper, the AC-DC converter with input impedance matching is experimentally demonstrated. Additionally, the design method of the proposed converter is described. First, the validity of the design procedure with using nondimensional parameters is confirmed with a simulation. Then, it is experimentally confirmed that the input impedance of the proposed converter is matched to the 50 + j0 Ω at a reflection coefficient of 2.6%. It means that, the reflection coefficient is significantly reduced by 94.5% compared with the conventional diode bridge rectifier (DBR) with a resistive load of 25 Ω.