9
2 x /3 x Step-Up Switched-Capacitor (SC) AC-DC Converters for RFID Tags
Authors: Kei Eguchi, Ichirou Oota, Shinya Terada, Hongbing Zhu
Number of views: 348
In signal processing circuits of a RDIF tag, the relaxation of restriction concerning operating voltage range
enables us to develop various applications. In order to provide higher voltage to the signal processing circuit, two types
of step-up AC-DC converters for RFID tags are proposed in this paper: the
step-up converter and the
step-up
converter. To reduce ripple noise of output voltage, the proposed converters consist of 2 charge-pump type AC-DC
converters with opposite polarities. Unlike conventional converters, the proposed converters can offer higher output
voltages by realizing /
step-up conversion. Furthermore, as for the
step-up converter, the circuit size of the
proposed converter is almost the same as that of the Cockcroft-Walton type AC-DC converter. The properties of the
proposed converters are clarified by theoretical analyses. The theoretical formulas can derive the equivalent circuits,
output voltages, and power efficiency. Furthermore, SPICE simulations and the experiments showed the validity of
theoretical formulas and circuit design.