Improvement of Power-Conversion Efficiency of a DC–DC Boost Converter Using a Passive Snubber Circuit

In this paper, we aim to make a detailed study on the evaluation and the characteristics of the non-inverting buck–boost converter. In order to improve the behaviour of the buck-boost converter for the three operating modes, we propose an architecture based on peak current-control. Using a three modes selection circuit and a soft start circuit, this converter is able to expand the power conversion efficiency and reduce inrush current at the feedback loop. The proposed converter is designed to operate with a variable output voltage. In addition, we use LDMOS transistors with low on-resistance, which are adequate for HV applications. The obtained results show that the proposed buck-boost converter perform perfectly compared to others architecture and it is successfully implemented using 0.18 μm CMOS TSMC technology, with an output voltage regulated to 12V and input voltage range of 4-20 V. The power conversion efficiency for the three operating modes buck, boost and buck-boost are 97.6%, 96.3% and 95.5% respectively at load current of 4A.

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Miniature DC-DC Boost Converter for Driving Display Panel of Notebook Computer

Energies ◽

10.3390/en12152924 ◽

2019 ◽

Vol 12 (15) ◽

pp. 2924

Author(s):

Seok-Hyeong Ham ◽

Hyung-Jin Choe

Keyword(s):

Power Conversion Efficiency ◽

Conversion Efficiency ◽

Power Conversion ◽

Input Voltage ◽

Boost Converter ◽

Switching Frequency ◽

Notebook Computer ◽

Switching Losses ◽

Voltage Stress ◽

Switch Temperature

This paper proposes a miniature DC-DC boost converter to drive the display panel of a notebook computer. To reduce the size of the circuit, the converter was designed to operate at a switching frequency of 1 MHz. The power conversion efficiency improved using a passive snubber circuit that consisted of one inductor, two capacitors, and two diodes; it reduced the switching losses by lowering the voltage stress of the switch and increased the voltage gain using charge pumping operations. An experimental converter was fabricated at 2.5 cm × 1 cm size using small components, and tested at input voltage 5 V ≤ VIN ≤ 17.5 V and output current 30 mA ≤ IO ≤ 150 mA. Compared to existing boost converters, the proposed converter had ~7.8% higher power conversion efficiency over the entire range of VIN and IO, only ~50% as much voltage stress of the switch and diodes, and a much lower switch temperature TSW = 49.5 °C. These results indicate that the proposed converter is a strong candidate for driving the display panel of a notebook computer.

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Improvement of Power-Conversion Efficiency of AC–DC Boost Converter Using 1:1 Transformer

IEEE Transactions on Power Electronics ◽

10.1109/tpel.2017.2762858 ◽

2018 ◽

Vol 33 (8) ◽

pp. 6646-6655 ◽

Cited By ~ 1

Author(s):

Seok-Hyeong Ham ◽

Hyung-Jin Choe ◽

Hyeon-Seok Lee ◽

Bongkoo Kang

Keyword(s):

Power Conversion Efficiency ◽

Conversion Efficiency ◽

Power Conversion ◽

Boost Converter

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DC Voltage Sensorless Predictive Control of a High-Efficiency PFC Single-Phase Rectifier Based on the Versatile Buck-Boost Converter

Sensors ◽

10.3390/s21155107 ◽

2021 ◽

Vol 21 (15) ◽

pp. 5107

Author(s):

Catalina González-Castaño ◽

Carlos Restrepo ◽

Fredy Sanz ◽

Andrii Chub ◽

Roberto Giral

Keyword(s):

Power Conversion Efficiency ◽

Real Time ◽

Conversion Efficiency ◽

Output Voltage ◽

Single Phase ◽

Power Conversion ◽

Input Voltage ◽

Boost Converter ◽

Boost Converters ◽

Grid Voltage

Many electronic power distribution systems have strong needs for highly efficient AC-DC conversion that can be satisfied by using a buck-boost converter at the core of the power factor correction (PFC) stage. These converters can regulate the input voltage in a wide range with reduced efforts compared to other solutions. As a result, buck-boost converters could potentially improve the efficiency in applications requiring DC voltages lower than the peak grid voltage. This paper compares SEPIC, noninverting, and versatile buck-boost converters as PFC single-phase rectifiers. The converters are designed for an output voltage of 200 V and an rms input voltage of 220 V at 3.2 kW. The PFC uses an inner discrete-time predictive current control loop with an output voltage regulator based on a sensorless strategy. A PLECS thermal simulation is performed to obtain the power conversion efficiency results for the buck-boost converters considered. Thermal simulations show that the versatile buck-boost (VBB) converter, currently unexplored for this application, can provide higher power conversion efficiency than SEPIC and non-inverting buck-boost converters. Finally, a hardware-in-the-loop (HIL) real-time simulation for the VBB converter is performed using a PLECS RT Box 1 device. At the same time, the proposed controller is built and then flashed to a low-cost digital signal controller (DSC), which corresponds to the Texas Instruments LAUNCHXL-F28069M evaluation board. The HIL real-time results verify the correctness of the theoretical analysis and the effectiveness of the proposed architecture to operate with high power conversion efficiency and to regulate the DC output voltage without sensing it while the sinusoidal input current is perfectly in-phase with the grid voltage.

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A High Power-Conversion-Efficiency Voltage Boost Converter with MPPT for Wireless Sensor Nodes

Sensors ◽

10.3390/s21165447 ◽

2021 ◽

Vol 21 (16) ◽

pp. 5447

Author(s):

Xiwen Zhu ◽

Qiang Fu ◽

Ruimo Yang ◽

Yufeng Zhang

Keyword(s):

Power Conversion Efficiency ◽

Conversion Efficiency ◽

High Power ◽

Power Conversion ◽

Boost Converter ◽

Sensor Nodes ◽

Wireless Sensor ◽

High Power Conversion Efficiency ◽

Wireless Sensor Nodes ◽

Pv Cell

A high power-conversion-efficiency voltage boost converter with MPPT for wireless sensor nodes (WSNs) is proposed in this paper. Since tiny wireless sensor nodes are all over complex environments, an efficient power management system (PMS) must be equipped to achieve long-term self-power supply and maintain regular operation. It is common to use Photovoltaic cells (PV) to harvest sunlight in the environment. However, most existing interface boost integrated circuits for the PV cell have low efficiency. This paper presents a voltage boost converter (VBC) with high power conversion efficiency (PCE) for WSNs. The integrated circuit (IC) designed in this paper includes a novel four-phase high-efficiency charge pump module, an ultra-low-power perturbation observation (P&O) MPPT control circuit module, a feedback control module, a nano-ampere current reference, etc. Manufactured in a standard 0.35 um complementary metal-oxide-semiconductor (CMOS) technology, the chip area is 3.15 mm × 2.43 mm. Test results demonstrate that when the output voltage of the PV cell is more than 0.5 V, VBC can improve the voltage to 3Vin, and the calculated voltage conversion efficiency can reach 99.4%. P&O MPPT algorithm makes output power improving 8.53%. Furthermore, when the output load current is 297uA, the output PCE achieves 85.1%.

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A thiourea additive-based quadruple cation lead halide perovskite with an ultra-large grain size for efficient perovskite solar cells

Nanoscale ◽

10.1039/c9nr07377a ◽

2019 ◽

Vol 11 (45) ◽

pp. 21824-21833 ◽

Cited By ~ 9

Author(s):

Jyoti V. Patil ◽

Sawanta S. Mali ◽

Chang Kook Hong

Keyword(s):

Thin Films ◽

Grain Size ◽

Solar Cells ◽

Power Conversion Efficiency ◽

Conversion Efficiency ◽

Power Conversion ◽

Perovskite Solar Cells ◽

Inorganic Perovskite ◽

Halide Perovskite ◽

Lead Halide

Controlling the grain size of the organic–inorganic perovskite thin films using thiourea additives now crossing 2 μm size with >20% power conversion efficiency.

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The Effect of Donor Molecular Structure on Power Conversion Efficiency of Small-Molecule-Based Organic Solar Cells

Mini-Reviews in Organic Chemistry ◽

10.2174/1570193x15666180627145325 ◽

2019 ◽

Vol 16 (3) ◽

pp. 236-243 ◽

Cited By ~ 1

Author(s):

Hui Zhang ◽

Yibing Ma ◽

Youyi Sun ◽

Jialei Liu ◽

Yaqing Liu ◽

...

Keyword(s):

Molecular Structure ◽

Solar Cells ◽

Power Conversion Efficiency ◽

Conversion Efficiency ◽

Small Molecule ◽

Organic Solar Cells ◽

Molecular Design ◽

Power Conversion ◽

The Relationship

In this review, small-molecule donors for application in organic solar cells reported in the last three years are highlighted. Especially, the effect of donor molecular structure on power conversion efficiency of organic solar cells is reported in detail. Furthermore, the mechanism is proposed and discussed for explaining the relationship between structure and power conversion efficiency. These results and discussions draw some rules for rational donor molecular design, which is very important for further improving the power conversion efficiency of organic solar cells based on the small-molecule donor.

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Enhanced efficacy of defect passivation and charge extraction for efficient perovskite photovoltaics with a small open circuit voltage loss

Journal of Materials Chemistry A ◽

10.1039/c9ta01760g ◽

2019 ◽

Vol 7 (15) ◽

pp. 9025-9033 ◽

Cited By ~ 29

Author(s):

Jin-Feng Liao ◽

Wu-Qiang Wu ◽

Jun-Xing Zhong ◽

Yong Jiang ◽

Lianzhou Wang ◽

...

Keyword(s):

Grain Boundary ◽

Power Conversion Efficiency ◽

Conversion Efficiency ◽

Open Circuit Voltage ◽

Power Conversion ◽

Charge Recombination ◽

Open Circuit ◽

Polymeric Semiconductor ◽

Voltage Loss ◽

Defect Passivation

A multifunctional 2D polymeric semiconductor was incorporated to provide surprisingly robust efficacy in grain boundary functionalization and defect passivation of perovskite, which suppresses charge recombination and thus affording an illustrious photovoltage of 1.16 V and power conversion efficiency of 21.1%.

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High performance tandem organic solar cells via a strongly infrared-absorbing narrow bandgap acceptor

Nature Communications ◽

10.1038/s41467-020-20431-6 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Zhenrong Jia ◽

Shucheng Qin ◽

Lei Meng ◽

Qing Ma ◽

Indunil Angunawela ◽

...

Keyword(s):

Solar Cells ◽

Power Conversion Efficiency ◽

Conversion Efficiency ◽

Organic Solar Cells ◽

High Performance ◽

Short Circuit ◽

Power Conversion ◽

High Power Conversion Efficiency ◽

Device Structure ◽

Narrow Bandgap

AbstractTandem organic solar cells are based on the device structure monolithically connecting two solar cells to broaden overall absorption spectrum and utilize the photon energy more efficiently. Herein, we demonstrate a simple strategy of inserting a double bond between the central core and end groups of the small molecule acceptor Y6 to extend its conjugation length and absorption range. As a result, a new narrow bandgap acceptor BTPV-4F was synthesized with an optical bandgap of 1.21 eV. The single-junction devices based on BTPV-4F as acceptor achieved a power conversion efficiency of over 13.4% with a high short-circuit current density of 28.9 mA cm−2. With adopting BTPV-4F as the rear cell acceptor material, the resulting tandem devices reached a high power conversion efficiency of over 16.4% with good photostability. The results indicate that BTPV-4F is an efficient infrared-absorbing narrow bandgap acceptor and has great potential to be applied into tandem organic solar cells.

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