Title :
An Active Voltage Doubling AC/DC Converter for Low-Voltage Energy Harvesting Applications
Author :
Cheng, Shuo ; Jin, Ying ; Rao, Yuan ; Arnold, David P.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Florida, Gainesville, FL, USA
Abstract :
This paper theoretically and experimentally investigates an ac/dc converter for low-voltage vibrational energy harvesting systems. The circuit employs an active-diode-based voltage doubler, where the output is a dc voltage that is twice the amplitude of the input ac voltage. Analytical solutions for the steady-state open-circuit voltage are derived, capturing the effects of the active-diode comparator hysteresis. It is shown that the hysteresis plays an important role in the rectification characteristics, circuit stability, and overall efficiency. Experimentally, the circuit is able to rectify input voltage amplitude as low as 5 mV and operates over a frequency range of 1 to 500 Hz, which spans most common mechanical vibrations. For input voltage amplitudes 250 mV or higher, the circuit exhibits >;80% efficiency for a range of load resistances, delivering 0.1-10 mW of power. Additionally, the circuit successfully rectifies the voltage from a vibrational energy harvester having a highly irregular and time-varying voltage waveform.
Keywords :
AC-DC power convertors; energy harvesting; rectifying circuits; active voltage doubling AC/DC converter; active-diode comparator hysteresis; active-diode-based voltage doubler; circuit stability; frequency 1 Hz to 500 Hz; low-voltage vibrational energy harvesting systems; mechanical vibrations; power 0.1 mW to 10 mW; steady-state open-circuit voltage; vibrational energy harvester; voltage 250 mV; voltage 5 mV; DC-DC power converters; Energy harvesting; MOSFET circuits; Schottky diodes; Threshold voltage; Voltage control; AC/DC converter; active diode; energy harvesting; voltage doubler;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2010.2096234