Abstract
Piezoelectric vibration based energy harvesting systems have been widely utilized and researched as powering modules for various types of sensor systems due to their ease of integration and relatively high energy density compared to RF, thermal, and electrostatic based energy harvesting systems. In this paper, a low-power CMOS full-bridge rectifier is presented as a potential solution for an efficient energy harvesting system for piezoelectric transducers. The energy harvesting circuit consists of two n-channel MOSFETs (NMOS) and two p-channel MOSFETs (PMOS) devices implementing a full-bridge rectifier coupled with a switch control circuit based on a PMOS device driven by a comparator. With a load of 45 kΩ, the output rectifier voltage and the input piezoelectric transducer voltage are 694 mV and 703 mV, respectably, while the VOUT versus VIN conversion ratio is 98.7% with a PCE of 52.2%. The energy harvesting circuit has been designed using 130 nm standard CMOS process.
Highlights
Technological advancements in low-power CMOS processes have driven rapid development of sensor electronics such as implantable and wearable sensor systems
The piezoelectric vibration based energy harvesting system has received a great deal of attention because of its ease of integration with electronic systems and moderate power density
The circuits reported in [4,5,6] aim to reduce the voltage drop across rectifier diodes while references [2,3,4,5,6,7,8,9] aim to reduce the wasted charges associated with the charging of the plate capacitance of the piezoelectric transducer to further increase the overall efficiency of the systems
Summary
Technological advancements in low-power CMOS processes have driven rapid development of sensor electronics such as implantable and wearable sensor systems. There are three general energy sources that utilize vibration, namely electrostatic, electromagnetic, and piezoelectric Among these sources, the piezoelectric vibration based energy harvesting system has received a great deal of attention because of its ease of integration with electronic systems and moderate power density. The circuits reported in [4,5,6] aim to reduce the voltage drop across rectifier diodes while references [2,3,4,5,6,7,8,9] aim to reduce the wasted charges associated with the charging of the plate capacitance of the piezoelectric transducer to further increase the overall efficiency of the systems.
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