A Switching-Mode Single-Stage Dual-Output Regulating Rectifier Achieving 92.33% Efficiency and Extended Range for Wireless Power Transfer
T. Lu (TU Delft - Electronic Instrumentation)
S. Du (TU Delft - Electronic Instrumentation)
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Abstract
This paper presents a Switching-Mode Regulating Rectifier (SM-RR) with single-stage dual-output regulation for biomedical wireless power transfer applications. To achieve both a high power conversion efficiency (PCE) and a long power transfer distance, the proposed SM-RR can seamlessly switch its operation between voltage mode and resonant current mode. To meet multi-power-rail requirements in loading circuits, it employs only three power transistors to provide two regulated outputs with parallel pulse-frequency modulation, which achieves unobservable cross-regulations. The prototype chip, fabricated in a 180 nm CMOS process, achieves two regulated outputs at 1.8 V and 3.3 V, respectively, up-to- 92.33% PCE, and up-to-42% transfer range extension compared to conventional voltage-mode receivers.