A Single-Stage Dual-Output Regulating Rectifier With Hysteretic Current-Wave Modulation
Jie Lin, Yan Lü, Chenchang Zhan, Rui P. Martins
Abstract
This article presents a 6.78-MHz single-stage dual-output regulating rectifier for miniaturizing the true wireless devices. The proposed rectifier topology realizes ac-dc power conversion and dual-output voltage regulation simultaneously in one single stage, using only four on-chip power transistors, thereby reducing chip area and off-chip components and improving the system power conversion efficiency. We integrate high voltage (HV) and low voltage (LV) transistors in the proposed dual-output rectifier for HV and LV output voltages, respectively. The proposed two independent three-level current-wave modulation (CWM) controllers realize voltage conversion and regulation for each output independently, with the instant transient response and no cross-regulation problem. The proposed dual-output regulating rectifier, fabricated in 0.18- μm CMOS using 1.8-/3.3-V devices, can deliver a total maximum power of 1.02 W at the dual-output voltages of 1.8 and 3.3 V. The circuit achieves a measured peak efficiency of 91.9% with an instant load-transient response for a load current step between 20 and 200 mA. The cross-regulation between the dual-output voltages is unnoticeable.