A Novel direct AC/DC converter for efficient low voltage energy harvesting

Dwari, Suman; Dayal, Rohan; Parsa, Leila

doi:10.1109/iecon.2008.4758001

Cited by 24 publications

(23 citation statements)

References 10 publications

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“…DCM can help to reduce switching losses [57] with respect to continuous current mode (CCM) operation, because of the lower switching frequencies and the elimination of reverse displacement current in the diode [88] or high-side MOSFET [84]. Furthermore, using pulse frequency modulation to achieve DCM means that the switching losses scale with the output power levels, which can improve the efficiency at low-power levels [84].…”

Section: Control Of Low-power Switch-mode Convertersmentioning

confidence: 99%

Review of Power Conditioning for Kinetic Energy Harvesting Systems

Szarka

Stark

Burrow

2012

IEEE Trans. Power Electron.

286

148

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In this paper, a summary of published techniques for power conditioning within energy harvesting systems is presented. The focus is on low-power systems, e.g, <10 mW, for kinetic energy harvesting. Published concepts are grouped according to functionality and results contrasted. The various techniques described are considered in terms of complexity, efficiency, quiescent power consumption, startup behavior, and utilization of the harvester compared to an optimum load. This paper concludes with an overview of power management techniques that aim to maximize the extracted power and the utilization of the energy harvester.

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Section: Control Of Low-power Switch-mode Convertersmentioning

confidence: 99%

Review of Power Conditioning for Kinetic Energy Harvesting Systems

Szarka

Stark

Burrow

2012

IEEE Trans. Power Electron.

286

148

View full text Add to dashboard Cite

show abstract

“…Switching converters are widely applied for voltage regulation in energy harvesting systems because of high efficiency and easy realization [1][2][3][4][5][6][7][8][9][10]. The output/input voltage ratio can be easily controlled by applying appropriate duty cycle on the switches, which makes the application of common control schemes possible.…”

Section: 'ïmentioning

confidence: 99%

Buck-boost converter for simultaneous semi-active vibration control and energy harvesting for electromagnetic regenerative shock absorber

Zhang

Kim

et al. 2014

SPIE Proceedings

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Regenerative semi-active suspensions can capture the previously dissipated vibration energy and convert it to usable electrical energy for powering on-board electronic devices, while achieve both the better ride comfort and improved road handling performance at the same time when certain control is applied. To achieve this objective, the power electronics interface circuit connecting the energy harvester and the electrical loads, which can perform simultaneous vibration control and energy harvesting function is in need. This paper utilized a buck-boost converter for simultaneous semi-active vibration control and energy harvesting with electromagnetic regenerative shock absorber, which utilizes a rotational generator to converter the vibration energy to electricity. It has been found that when the circuit works in discontinuous current mode (DCM), the ratio between the input voltage and current is only related to the duty cycle of the switch pulse width modulation signal. Using this property, the buck-boost converter can be used to perform semi-active vibration control by controlling the load connected between the terminals of the generator in the electromagnetic shock absorber. While performing the vibration control, the circuit always draw current from the shock absorber and the suspension remain dissipative, and the shock absorber takes no additional energy to perform the vibration control. The working principle and dynamics of the circuit has been analyzed and simulations were performed to validate the concept.

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“…Topologies reported in the literature are typically fall into one of two categories, two-stage or single-stage power extraction 3 ; for low-voltage generators the latter category was shown to be more efficient due to the reduced number of components in the direct generated current's path 4 . Switched-inductor converter topologies have been reported in previous works, based on either two inductors resulting in a dual converter topology 5,6 , or a single inductor with a rectifying output stage 7,8 . Reported conversion efficiencies reach up to 63% for the dual-boost/buck-boost topology 5 and up to 65% for the split capacitor based direct AC-DC converter 4 .…”

Section: Introductionmentioning

confidence: 99%

“…Switched-inductor converter topologies have been reported in previous works, based on either two inductors resulting in a dual converter topology 5,6 , or a single inductor with a rectifying output stage 7,8 . Reported conversion efficiencies reach up to 63% for the dual-boost/buck-boost topology 5 and up to 65% for the split capacitor based direct AC-DC converter 4 .…”

Section: Introductionmentioning

confidence: 99%

Comparison of low-power single-stage boost rectifiers for sub-milliwatt electromagnetic energy harvesters

et al. 2013

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Energy harvesting could provide power-autonomy to many important embedded sensing application areas. However, the available envelope often limits the power output, and also voltage levels. This paper presents the implementation of an enabling technology for space-restricted energy harvesting: Four highly efficient and fully autonomous power conditioning circuits are presented that are able to operate at deep-sub-milliwatt input power at less than 1 V pk AC input, and provide a regulated output voltage. The four complete systems, implemented using discrete components, include the power converters, the corresponding ancillary circuits with sub-10 µW consumption, start-up circuit, and an ultra-lowpower shunt regulator with under-voltage lockout for the management of the accumulated energy. The systems differ in their power converter topology; all are boost rectifier variants that rectify and boost the generator's output in a single stage, that are selected to enable direct comparison between polarity-dependent and -independent, as well as between full-wave and half-wave power converter systems. Experimental results are derived over a range of 200-1200 µW harvester output power, the system being powered solely by the harvester. Experimental results show overall conversion efficiency, accounting for the quiescent power consumption, as high as 82% at 650 µW input, which remains in the 65-70% range even at 200 µW input for the half-wave variant. Harvester utilisation of over 90% is demonstrated in the submilliwatt range using full-wave topologies. For the evaluated generator, the full-wave, polarity-dependent boost rectifier offers the best overall system effectiveness, achieving up to 73% of the maximum extractable power.

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A Novel direct AC/DC converter for efficient low voltage energy harvesting

Cited by 24 publications

References 10 publications

Review of Power Conditioning for Kinetic Energy Harvesting Systems

Review of Power Conditioning for Kinetic Energy Harvesting Systems

Buck-boost converter for simultaneous semi-active vibration control and energy harvesting for electromagnetic regenerative shock absorber

Comparison of low-power single-stage boost rectifiers for sub-milliwatt electromagnetic energy harvesters

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