Abstract
In this research work, we investigated a dual switch (DS) active rectifier for the piezoelectric (PE) energy scavenging system. In the proposed DS active rectifier configuration, two extra switches are shunted across the PE transducer which helps the PE transducer’s capacitor in charging and discharging which results in maximum power extraction from the PE transducer. Moreover, in the proposed rectifier configuration comparator controlled active diodes are used instead of conventional/passive diodes to minimize the threshold voltage V T H drop. The proposed DS active rectifier design is fabricated in a 1-poly 6-metal 180-nm standard CMOS process. The simulation and measured results of the proposed DS active rectifier design have the better power conversion efficiency (PCE) of 91.5 %, which definitely helps in extracting more power than the conventional full bridge rectifier (FBR).
Highlights
Energy Scavenging or Harvesting is a process in which energy can be derived/extracted from the various environmental sources like solar, thermal, RF, etc. [1,2,3,4]
It is obvious that the use of two switches in parallel with the PE transducer, discharges the capacitor C p to ground twice in a cycle, when current I p crosses zero which results in higher value and higher power extraction compared to the cross-coupled active rectifier
We show that a dual switch (DS) active rectifier for a piezoelectric (PE) energy scavenging system becomes more efficient by shunting two extra switches with the PE transducer
Summary
Energy Scavenging or Harvesting is a process in which energy can be derived/extracted from the various environmental sources like solar, thermal, RF, etc. [1,2,3,4]. The most commonly used AC–DC converters are the conventional full bridge rectifiers (FBR) and half wave rectifiers. The drawback of these rectifiers is low power extraction and low conversion efficiency which introduced a switch only (single switch) rectifier [2,3]. The work in [3,4,5,6] has designed the active rectifier and [3] redesign it and use it with a single switch which improves the power conversion efficiency [7,8,9]. We introduce a dual switch active rectifier with high-power extraction and better conversion efficiency implemented on a.
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