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Summary
This summary is machine-generated.

Comparing three passive rectifiers for low-power energy harvesting, the voltage doubler (VD) and negative voltage converter (NVC) significantly outperform the full-wave bridge rectifier (FWR). The VD is optimal for low speeds, while the NVC excels at higher speeds, enabling self-powered sensor applications.

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Area of Science:

  • Electrical Engineering
  • Energy Harvesting
  • Power Electronics

Background:

  • Low-power energy harvesting is crucial for powering smart sensors and IoT devices.
  • Kinetic energy harvesters often produce alternating current (AC) that requires rectification.
  • Rectifier choice significantly impacts energy harvesting system efficiency and power output.

Purpose of the Study:

  • To quantitatively compare the performance of three passive rectifiers: full-wave bridge rectifier (FWR), voltage doubler (VD), and negative voltage converter (NVC).
  • To evaluate their impact on power conversion efficiency (PCE) and power extraction efficiency (PEE) in a low-voltage electromagnetic energy harvesting system.
  • To assess rectifier performance in a low-speed rotational energy harvesting application (5-20 rpm) and an end-to-end self-powered sensing system.

Main Methods:

  • Experimental investigation of FWR, VD, and NVC rectifiers integrated with a variable reluctance energy harvesting system.
  • Measurements conducted at rotational speeds ranging from 5 rpm to 20 rpm.
  • Performance evaluation using power conversion efficiency (PCE) and power extraction efficiency (PEE) metrics, followed by an end-to-end system test.

Main Results:

  • The FWR exhibited lower performance (20-40% PEE) compared to VD (40-60% PEE) and NVC (20-70% PEE).
  • The VD rectifier showed superior performance at lower rotational speeds.
  • The NVC rectifier outperformed the VD at higher speeds (above 18 rpm).

Conclusions:

  • The VD rectifier is the optimal choice for low rotational speed energy harvesting applications.
  • The NVC rectifier offers better performance at higher rotational speeds.
  • An end-to-end evaluation demonstrated that the VD rectifier enabled a self-powered RPM sensing system to reach its maximum sampling rate at 15.5 rpm.