A Bipolar-Input Thermoelectric Energy-Harvesting Interface With Boost/Flyback Hybrid Converter and On-Chip Cold Starter

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

doi:10.1109/jssc.2019.2924095

Cited by 37 publications

(20 citation statements)

References 16 publications

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“…If the input power remains too low for too long, then the output voltage will discharge below the minimum level required for operation. Works such as [5], [19], [16], [18] use self-start techniques to recover after this happens. The lowest self-start voltage reported was ±5 mV and requires special startup circuitry.…”

Section: Power Goodmentioning

confidence: 99%

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A ±0.5-mV-Minimum-Input DC-DC Converter with Stepwise Adiabatic Gate-Drive and Efficient Timing Control for Thermoelectric Energy Harvesting

Carlson¹,

Smith²

2022

Preprint

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<p>This paper presents a step-up DC-DC converter that uses a stepwise gate-drive technique to reduce the power FET gate-drive energy by 82%, allowing positive efficiency down to an input voltage of ±0.5 mV—the lowest input voltage ever achieved for a DC-DC converter as far as we know. Below ±0.5 mV the converter automatically hibernates, reducing quiescent power consumption to just 255 pW. The converter has an efficiency of 63% at ±1 mV and 84% at ±6 mV. The input impedance is programmable from 1 Ω to 600 Ω to achieve maximum power extraction. A novel delay line circuit controls the stepwise gate-drive timing, programmable input impedance, and hibernation behavior. Bipolar input voltage is supported by using a flyback converter topology with two secondary windings. A generated power good signal enables the load when the output voltage has charged above 2.7 V and disables when the output voltage has discharged below 2.5 V. The DC-DC converter was used in a thermoelectric energy harvesting system that effectively harvests energy from small indoor temperature fluctuations of less than 1°C. Also, an analytical model with unprecedented accuracy of the stepwise gate-drive energy is presented. </p>

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Section: Power Goodmentioning

confidence: 99%

“…T1 and T3 are the times that vG1 starts and ends the transition from high to low (T3 − T1 = TF). T2 is the time that vG1 crosses the threshold voltage of M1, where the channel current becomes 16), ( 18), (19), and measurement of the silicon. effectively zero.…”

Section: A Efficiency Considerationsmentioning

confidence: 99%

A ±0.5-mV-Minimum-Input DC-DC Converter with Stepwise Adiabatic Gate-Drive and Efficient Timing Control for Thermoelectric Energy Harvesting

Carlson¹,

Smith²

2022

Preprint

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“…With the wide application of electronic equipment, power supply plays an increasingly important role. Due to natural input and output isolation, flyback topology has been universally used in mobile device, LED driver and IoT areas [1][2][3]. An opto-coupler is adapted in traditional secondary side regulated (SSR) flyback topology to regulate output voltage.…”

Section: Introductionmentioning

confidence: 99%

A Novel Ladder Control Assisted Startup for Primary Side Regulated Flyback Converter

Tang

Luo

Deng

et al. 2021

2021 IEEE International Symposium on Circuits and Systems (ISCAS)

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A novel ladder control assisted startup for primary side regulated flyback converter without off-chip capacitors is proposed in this paper to reduce the overshoot voltage and optimize the startup time under different loads and input voltages. Large peak current in traditional soft-startup process may damage devices, and the detail reasons are illustrated in this work. To overcome the problems caused by the slow callback process of the error amplifier, sample information relative to the input voltage and load current is used by the ladder control circuit to generate a series of voltages to assist the startup. The proposed controller chip is fabricated in 0.18μm BCD process. The experiment results show that the overshoot voltage can be reduced from 20V to less than 0.3V and startup time can be reduced from 105ms to 42ms with the ladder control.

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“…Due to the advantages, many studies are being carried out [24][25][26][27] and new topologies are being developed based on boostflyback converters [28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Double boost‐flyback converter

Cardoso

Brockveld

Lazzarin

et al. 2020

IET Power Electronics

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A high-gain step-up non-isolated dc-dc converter is proposed in this study, named the double boost-flyback converter. The topology combines two conventional boost-flyback converters with input-parallel and floating-output connections. The new topology increases the static gain and reduces the input current ripple in relation to the conventional boost-flyback topology. The proposed converter has the potential to be used in low input voltage applications that require a high gain, such as systems powered by photovoltaic panels, fuel cells, electric vehicles, and low voltage batteries. This study provides details on the principle of operation, static gain, control strategy, design guide and experimental verification. A 1 kW prototype was designed and built for an input voltage of 48 V and an output voltage of 800 V, reaching a static gain of 16.67. The maximum efficiencies obtained were 94.6% at 70% of load and 93.9% at rated load.

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A Bipolar-Input Thermoelectric Energy-Harvesting Interface With Boost/Flyback Hybrid Converter and On-Chip Cold Starter

Cited by 37 publications

References 16 publications

A ±0.5-mV-Minimum-Input DC-DC Converter with Stepwise Adiabatic Gate-Drive and Efficient Timing Control for Thermoelectric Energy Harvesting

A ±0.5-mV-Minimum-Input DC-DC Converter with Stepwise Adiabatic Gate-Drive and Efficient Timing Control for Thermoelectric Energy Harvesting

A Novel Ladder Control Assisted Startup for Primary Side Regulated Flyback Converter

Double boost‐flyback converter

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