Title :
A 13.56 MHz wireless power transfer system without impedance matching networks
Author :
Minfan Fu ; Tong Zhang ; Xinen Zhu ; Chengbin Ma
Author_Institution :
Univ. of Michigan-SJTU Joint Inst., Shanghai Jiao Tong Univ., Shanghai, China
Abstract :
A 13.56 MHz wireless power transfer (WPT) system is analyzed and implemented in this paper. This system consists of five subsystems: a class-D power amplifier, a pair of resonant coils, a rectifier, a DC/DC converter and various loads. By analyzing the transfer characteristics of the resonant coils, an optimum impedance is derived in order to minimize the power reflection. This impedance requirement is fulfilled by designing the rectifier and the DC/DC converter properly. The power reflection due to impedance mismatch can be controlled at 5%. When the load is a resistor, the system efficiency can reach 73% . When the loads are batteries or supercapacitors, the system efficiency can reach 66%.
Keywords :
DC-DC power convertors; coils; power amplifiers; radiofrequency power transmission; rectifiers; DC-DC converter; WPT system; batteries; class-D power amplifier; efficiency 66 percent; efficiency 73 percent; frequency 13.56 MHz; impedance mismatch; optimum impedance; power reflection minimization; rectifier; resistor; resonant coil transfer characteristics; supercapacitors; wireless power transfer system; Coils; Couplings; DC-DC power converters; Impedance; Impedance matching; Resistance; Wireless communication; impedance matching; magnetic resonance; power reflection; wireless power transfer system;
Conference_Titel :
Wireless Power Transfer (WPT), 2013 IEEE
Conference_Location :
Perugia
Print_ISBN :
978--14673-5008-2
DOI :
10.1109/WPT.2013.6556923
