27.1 An 84% Peak Efficiency Bipolar-Input Boost/Flyback Hybrid Converter With MPPT and on-Chip Cold Starter for Thermoelectric Energy Harvesting

Cao, Peng; Qian, Yong; Xue, Pan; Lu, Danzhu; He, Jie; Hong, Zhiliang

doi:10.1109/isscc.2019.8662368

Cited by 15 publications

(7 citation statements)

References 3 publications

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“…where C tot is the total equivalent capacitance driven per cycle, R on and R op are the total switch-on resistance during the charging and discharging period of the inductor, respectively. In [4], the linear approximation of the optimal frequency is made for simplicity. To further optimize the efficiency, a precise switching clock generation block is applied in this design.…”

Section: A Vco and Mppt Blockmentioning

confidence: 99%

“…It consists of an absolute voltage to current(AVCG) circuit, squaring circuit and the 2/3 power operating circuit. The AVCG shares the same structure of [4] and generates a current I 1 equal to |V G | /R. For the squaring circuit, it's obvious that:…”

Section: A Vco and Mppt Blockmentioning

confidence: 99%

“…[3] introduces a switch-matrix technique to keep the input voltage of the boost always be positive. The harvester in [4] achieves a high efficiency by introducing an advanced boost/flyback hybrid topology with an adaptive switching frequency.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Bipolar-Input Bipolar-Output DC-DC Converter for Thermoelectric Energy Harvesting

Cao

Hong

2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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This paper presents a single-inductor bipolar-input bipolar-output(SIBIBO) DC-DC converter for thermolectric energy harvesting. With an advanced topology, the converter can not only extract energy with bipolar input voltages but also generate bipolar output voltages. To improve the conversion efficiency, the open-circuit voltage maximum power point tracking method is applied in this design. In addition, a precise VCO is proposed to dynamically adjust the switching frequency according to the input voltage. Designed and simulated in an 180nm CMOS process, the harvester achieves a peak conversion efficiency of 90.3% at V TEG =200mV and 86.9% at V TEG =-190mV .

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Section: A Vco and Mppt Blockmentioning

confidence: 99%

Section: A Vco and Mppt Blockmentioning

confidence: 99%

See 1 more Smart Citation

A Bipolar-Input Bipolar-Output DC-DC Converter for Thermoelectric Energy Harvesting

Cao

Hong

2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

Self Cite

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“…All presently available systems which can start up from voltages below 100 mV are based on an oscillator with a transformer and a transistor with very low threshold voltage such as a native or depletion transistor or JFET (starting transistor). There are circuits available which can operate with bipolar input voltage and just one transformer [6,7], but they have poor performance (higher startup voltage and/or lower efficiency) compared to unipolar converters.…”

Section: Introductionmentioning

confidence: 99%

A Bipolar ±13 mV Self-Starting and 85% Peak Efficiency DC/DC Converter for Thermoelectric Energy Harvesting

Dillersberger

Deutschmann

Tham³

2020

Energies

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This paper presents a novel converter for boosting the low-voltage output of thermoelectric energy harvesters to power standard electronic circuits. The converter can start up from a fully depleted state of the system off a bipolar ±13 mV input and can boost it to output voltages of up to 5 V. The converter comprises two transformers, one for each polarity that are multiplexed between an oscillator (used during startup) and a flyback converter (used during normal operation). To eliminate leakage currents in the input stage, the unused converter is completely turned off at startup and both converters are automatically shut off if the input power is found to be too low. Measurement results of the converter designed in a 180 nm CMOS process demonstrate a peak end-to-end conversion efficiency of 85% and nearly perfect impedance matching over the full input voltage range. This is the first time that a converter for ultra-low bipolar input voltages achieves the same performance as a unipolar converter.

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“…Hence, these devices require frequent battery recharging, which is undesirable. Ambient energy harvesting has been adapted as a solution to prolong battery life or make these devices self-powered using various harvesting sources [1][2][3][4][5]. However, to harvest energy from vibrations produced by human motion, piezoelectric transducers (PZTs) [6][7][8] and triboelectric nano-generators (TENG) [9,10] are the most suitable options.…”

Section: Introductionmentioning

confidence: 99%

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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27.1 An 84% Peak Efficiency Bipolar-Input Boost/Flyback Hybrid Converter With MPPT and on-Chip Cold Starter for Thermoelectric Energy Harvesting

Cited by 15 publications

References 3 publications

A Bipolar-Input Bipolar-Output DC-DC Converter for Thermoelectric Energy Harvesting

A Bipolar-Input Bipolar-Output DC-DC Converter for Thermoelectric Energy Harvesting

A Bipolar ±13 mV Self-Starting and 85% Peak Efficiency DC/DC Converter for Thermoelectric Energy Harvesting

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

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