High-Gain Switched-Capacitor DC-DC Converter With Low Count of Switches and Low Voltage Stress of Switches

Stala, Robert; Chojowski, Maciej; Waradzyn, Zbigniew; Mondzik, Andrzej; Folmer, Szymon; Penczek, Adam; Skała, A.; Пирог, С.

doi:10.1109/access.2021.3104399

Cited by 9 publications

(4 citation statements)

References 37 publications

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“…For calculating the conduction losses, the average and rms values of currents in the particular branches of the converter can be determined on the basis of the input current. A similar method was proposed in [4]. The maximum value of the input current pulses depends on the input voltage and power and can be easily determined by assuming a sinusoidal shape of the current.…”

Section: Model Of Efficiencymentioning

confidence: 99%

“…The input current ripple is associated with the method of operation of the SC circuits that is based on the charging and discharging of the switched capacitors in various configurations. This is clearly seen in SC voltage multipliers [2]- [4], such as a classic multiplier discussed in [2], or the converter presented in [3], where the input current can be approximated by a rectified sinusoidal shape. In other types of SC series-parallel converters, like those presented in [4], the input current is even deteriorated by zero-current periods that occur between the sequences of pulses, or an inequality of pulses occurs [5].…”

Section: Introductionmentioning

confidence: 96%

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Input Current Ripple Reduction in a Step-Up DC–DC Switched-Capacitor Switched-Inductor Converter

2022

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This paper presents research results related to the concept of a high-voltage-gain DC-DC converter with a low input current ripple. In the proposed topology, a low-volume DC-DC switch-mode boost converter operates in parallel with a switched-capacitor voltage multiplier (SCVM). The overall converter achieves a four-fold voltage gain, but the voltage stress of the transistor and the diode of the boost converter is only half of the output voltage. This is achieved by applying the specific topology of the proposed converter. Furthermore, the boost part uses a low-volume choke as it operates in the discontinuous conduction mode (DCM). The parallel operation of the boost converter with the SCVM decreases the current stress in some components of the multiplier. This paper presents a concept of the hybrid converter, an analytical model for the selection of components and switching parameters, an efficiency model, and the verification of the converter operation through simulation tests and experiments.

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Section: Model Of Efficiencymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Input Current Ripple Reduction in a Step-Up DC–DC Switched-Capacitor Switched-Inductor Converter

2022

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“…For this, different types of power losses should be considered and calculated to show that a proposed converter is efficient. Generally, two switching and dynamic losses are investigated for these converters [11][12][13][14].…”

Section: Research Gap and Introductionmentioning

confidence: 99%

“…Increasing the input voltage via charge pump (CP) topologies is possible [14,[27][28][29]. This technique is known as the switched-capacitors-based charging technique.…”

Section: Research Gap and Introductionmentioning

confidence: 99%

A New Voltage-Multiplier-Based Power Converter Configuration Suitable for Renewable Energy Sources and Sustainability Applications

et al. 2022

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The sustainability of new-generation energy sources has become one of the most critical challenges in recent years as renewable energy sources (RESs) rapidly replace old fossil sources. Integration between RESs and the grid should be completed through power electronics converters and optimized control techniques. RESs have many advantages, such as having increased reliability and sustainability, being environmentally friendly, and having cheaper maintenance costs and more reasonable energy prices. Photovoltaic (PV) panels are among the most popular RESs. A PV array’s generated voltage level is unsuitable for direct load or grid connection and has to be enhanced via a DC-DC boost converter. After that, an inverter should be used to change the generated DC voltage to AC voltage for the grid or loads. In order to reach higher voltage gains, different structures have been proposed in the literature, such as cascaded converters, non-isolated converters (including transformers), and positive- and negative-voltage-lift Luo converters. These converters have some disadvantages, such as including a large number of semiconductor devices and inductors, heavy and bulky structures, and the need for intermediate converters to convert DC to AC voltage and vice versa. Besides the efficiency and high DC voltage gain feature, to achieve more reliability and sustainability and a longer lifetime of the PV source, the current drawn from these sources should be as ripple-free as possible. This study considers all these details by presenting a novel DC-DC power boost converter. The steady-state analysis, simulation, and test results are presented. The most important features of the proposed converter include the lack of need for a transformer, intermediate inverter, rectifier converters, and bulky and heavy components, while still ensuring that high voltage gains and high efficiencies are possible. Simulation results showed that for duty ratios from D = 0.05 to D = 0.15 for the switch S3, the gain of the converter was 22, 35, and 70 times greater than the input voltage, respectively. The desired 200 VDC and 400 VDC voltages for the output nodes were obtained using 12 VDC as the input voltage with and without the switched-capacitor cell, respectively. A limited number of the voltages between −47 and 12 V dropped across the inductors, and a reversed voltage from −12 to −48 V was reported for the power diodes. Additionally, an efficiency close to 96.88% was obtained for the proposed converter. According to the experimental results, a voltage close to 198 VDC was obtained with a 12 VDC input voltage source without using the switched-capacitor cell. A current with a maximum of 7 A was reported for the output diode, and more than 96% efficiency was reported. The results showed that the primary source of the power losses was the semiconductors, and the switching losses made up around 69% and 88% of the total losses for the switches and diodes, respectively. The present topology has three power switches. Two of the switches are activated and deactivated simultaneously. The third switch is activated or deactivated in reverse with the other switches. The results showed that for short-duty ratios such as 0.5 for switches S1 and S2 and 0.35 for switch S3, DC voltage gains close to 35 were obtained theoretically. The generated voltage could be doubled by applying fourth and fifth power switches by making a switched-capacitor-based topology. All of these details are illustrated in this study in detail. The proposed circuit was set up and tested in a laboratory environment. The test results confirm the simulation and theoretical analysis.

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Reconfigurable high step‐up DC to DC converter for microgrid applications

Tewari

Paul

Meenakshi

et al. 2023

IET Power Electronics

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Here, a high gain DC–DC converter which is based on switched capacitor (SC) and switched LCL (SLCL) cells is presented. The diode employed in the classical passive switched inductor (SI) cell is replaced by a capacitor in the proposed SLCL cell to achieve higher voltage gain. Two switches—one each in the positive and negative DC rails of the supply are employed to charge and discharge the inductors of SLCL cells. A generic structure comprising of N and M number of SLCL cells in the positive and negative DC rails respectively along with K number of SC cells is presented. To validate the proposed gain extension concept, a two‐switch based converter comprising of 2 SLCL and 1 SC cells is synthesized and its operation is described in detail. The voltage gain expression of the proposed SLCL‐SC converter is derived. Experimental results are obtained from a 25 to 380 V prototype converter which operates at a full‐load efficiency of 94.22% at 200 W. Since the switches employed in the proposed converter are operated at a moderate and safe duty ratio of D = 0.51, the voltage stress on the switches is about 25% of the output voltage while the diodes are subjected to even lesser voltage stress levels of only one‐fifth of the output voltage. The main salient features of the proposed topology are its (i) modular structure, (ii) ability to provide higher voltage gain values at lower duty ratios (iii) reduced voltage stress on the semiconductor devices and (iv) reduced conduction losses due to the replacement of diodes with capacitors in SLCL cells.

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High-Gain Switched-Capacitor DC-DC Converter With Low Count of Switches and Low Voltage Stress of Switches

Cited by 9 publications

References 37 publications

Input Current Ripple Reduction in a Step-Up DC–DC Switched-Capacitor Switched-Inductor Converter

Input Current Ripple Reduction in a Step-Up DC–DC Switched-Capacitor Switched-Inductor Converter

A New Voltage-Multiplier-Based Power Converter Configuration Suitable for Renewable Energy Sources and Sustainability Applications

Reconfigurable high step‐up DC to DC converter for microgrid applications

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