Multi-Step Bias-Flip Rectification for Piezoelectric Energy Harvesting

Javvaji, Sundeep; Singhal, Vipul; Menezes, Vinod; Chauhan, Rajat; Pavan, Shanthi

doi:10.1109/esscirc.2018.8494272

Cited by 8 publications

(16 citation statements)

References 8 publications

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“…Unlike prior flipping-capacitor-based harvesters [16,17], the proposed harvesting interface maximizes the PZT output voltage (to its peak voltage), resulting in stronger mechanical damping and higher energy extraction without the usage of large capacitors for bias flipping. Prior works [6,7,14,15,20] require a bulky off-chip inductor, whereas the proposed circuit needs eight high-voltage capacitors (0.75 nF each), which can be integrated on chip. The proposed harvesting interface can handle strong input excitations with high open-circuit voltage (simulated results shown for up to 100 V) thanks to the capacitive-PECE technique, while achieving 3.37 × energy extraction improvement compared to an FBR-based harvester.…”

Section: Resultsmentioning

confidence: 99%

“…At this point, CP is shorted to drain any remaining energy. Then these flipping capacitors are re-arranged (with the help of switches) to charge CP with opposite One of the most popular piezoelectric energy harvesting schemes is synchronous switch harvesting on inductor (SSHI) [13,15], which can be simplified as shown in Figure 1a. A negative voltage converter (NVC) is used to rectify alternating PZT output voltage (V P ).…”

Section: Introductionmentioning

confidence: 99%

“…This polarity flipping is performed to avoid wasting charges already collected on C P and reaching V RECT for the next half-cycle earlier, so that NVC conduction (harvesting) period can be maximized. Inductor-based bias-flip harvesters [13,15,18] usually require an inductor and a switch, as shown in Figure 1a. At the end of deformation, V P becomes lower than V RECT , therefore, NVC conduction stops.…”

Section: Introductionmentioning

confidence: 99%

“…Then these flipping capacitors are re-arranged (with the help of switches) to charge C P with opposite polarity. In the case of strong input excitations (which can generate high V OC ) applied to SSHI or FCR-based harvesters [13,[15][16][17][18], V P does not change much, due to fixed energy storage voltage (V RECT ), which acts as protection against strong input excitations. However, keeping storage voltage limited significantly reduces the energy extraction from the PZT [19], since it decreases PZT damping force, and hence lower energy extraction.…”

Section: Introductionmentioning

confidence: 99%

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A Piezoelectric Harvesting Interface with Capacitive Partial Electric Charge Extraction for Energy Harvesting from Irregular High-Voltage Input

2020

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A fully integrated piezoelectric energy harvesting interface is proposed for harvesting energy from irregular human motion. To handle irregular pulse inputs generated by the piezoelectric transducer (PZT), the proposed harvesting interface includes a wake-up controller that activates the harvesting interface only when human motion is detected and deformation is applied on the piezoelectric material, thereby keeping static power loss low. The PZT output voltage is increased to its peak voltage by removing any type of external load capacitance seen by the PZT during its deformation. Once the peak voltage is detected, a multi-voltage conversion-ratio-based switched-capacitor circuit is activated to transfer PZT-generated energy to the battery in multiple ratio steps to maximize the conversion efficiency, with the help of a carefully designed harvesting controller. To deal with open-circuit voltages (V OCS ) higher than the maximum voltage tolerated (V MAX ) by available technology, capacitive partial electric charge extraction is activated every time the PZT output voltage approaches the V MAX . The proposed harvesting interface extracts 3.37 times more energy than a conventional full-bridge rectifier-based harvesting scheme.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Piezoelectric Harvesting Interface with Capacitive Partial Electric Charge Extraction for Energy Harvesting from Irregular High-Voltage Input

2020

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“…This means that to capitalize on the extractable energy from the PZT, the load capacitance seen by the PZT should be minimized [28]. Numerous harvesting interface circuits have been proposed [17,25,27,[30][31][32][33][34] to efficiently harvest energy generated by vibrations applied to the PZT. Most of these prior works focus on harvesting energy from continuous (sinusoidal) or shock (decaying sinusoidal) excitations applied to the PZT.…”

Section: Introductionmentioning

confidence: 99%

Dual Piezoelectric Energy Investing and Harvesting Interface for High-Voltage Input

Khan

Saif

Lee

et al. 2021

Sensors

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A novel harvesting interface for multiple piezoelectric transducers (PZTs) is proposed for high-voltage energy harvesting. Pre-biasing a PZT prior to its mechanical deformation increases its damping force, resulting in higher energy extraction. Unlike the conventional harvesters where a PZT-generated output is assumed to be continuous sinusoidal and output polarity is assumed to be alternating every cycle, PZT-generated output from human motion is expected to be random. Therefore, in the proposed approach, energy is invested to the PZT only when PZT deformation is detected. Upon the motion detection, energy stored at a storage capacitor (CSTOR) from earlier energy harvesting cycle is invested to pre-bias PZT, enhancing energy extraction. The harvested energy is transferred to back CSTOR for energy investment on the next cycle and then excess energy is transferred to the battery. In addition, partial electric charge extraction (PECE) is adapted to extract a partial amount of charges from the PZT every time its voltage approaches the process limit of 40 V. Simulations with 0.35 µm BCD process show 7.61× (with PECE only) and 8.38× (with PECE and energy investment) improvement compared to the conventional rectifier-based harvesting scheme Proposed harvesting interface successfully harvests energy from excitations with open-circuit voltages up to 100 V.

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Robust vibration invariant SSHI rectifier circuit for piezoelectric device

Singh

Pal

Kundu

2021

Analog Integr Circ Sig Process

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Rectifier is the most critical block of the power conditioning circuit designed for the Piezoelectric Energy Harvester (PZEH). Maintaining high rectification efficiency under the variable ambient conditions is the major design challenge. This paper presents a novel topology of self tuned Synchronized Switch Harvesting on Inductor (SSHI) based rectifier circuit for PZEH which provides high power extraction efficiency over a wide range of frequency and magnitude of input vibrations available. The high rectification efficiency is maintained for different PZ devices also. The synchronization of SSHI block under different ambient conditions is achieved by an adaptively controlled pulse generator circuit which uses internal voltage sensing. An active diode circuit to reduce the conduction loss in SSHI block and forward voltage drop of rectifier is used. The proposed circuit is working from 100 to 350 Hz with flipping efficiency above 90% and power extraction efficiency around 50%. A maximum power conversion efficiency of 58 % and maximum flipping efficiency of 93.6% is obtained with a figure of merit of 467% and output power of 72:6 lW.

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Multi-Step Bias-Flip Rectification for Piezoelectric Energy Harvesting

Cited by 8 publications

References 8 publications

A Piezoelectric Harvesting Interface with Capacitive Partial Electric Charge Extraction for Energy Harvesting from Irregular High-Voltage Input

A Piezoelectric Harvesting Interface with Capacitive Partial Electric Charge Extraction for Energy Harvesting from Irregular High-Voltage Input

Dual Piezoelectric Energy Investing and Harvesting Interface for High-Voltage Input

Robust vibration invariant SSHI rectifier circuit for piezoelectric device

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