New High Step-up dc-dc Converter with Quasi-Z-Source Network and Switched-Capacitor Cell

Andrade, Jéssika Melo de; Coelho, Roberto F.; Lazzarin, Telles Brunelli

doi:10.1109/apec39645.2020.9124305

Cited by 9 publications

(18 citation statements)

References 18 publications

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“…The proposed converter in Ahmad et al 27 produces a gain of 2/(1 − λ ) 2 , but the stress across the switch is high. In de Andrade et al, 32 a quasi‐Z‐network, SC cell‐based converter is analyzed that provides high‐voltage gain with four inductors. The converter introduced in Varesi and Esfahlan 33 has the same number of components as the proposed converter, but the operating range of duty ratio is wider.…”

Section: Introductionmentioning

confidence: 99%

A non‐isolated quasi‐Z‐source‐based high‐gain DC–DC converter

Mahmood

Zaid

Khan

et al. 2021

Circuit Theory & Apps

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To overcome the problems associated with Z-source-based DC-DC converters, a quasi-Z-source (QZS)-based high-gain DC-DC boost converter with switched capacitors is proposed in this work. Z-source-based DC-DC converters have problems like low-voltage gain, discontinuous input current, and high-voltage stress on the active and passive components. The proposed converter can produce a high-voltage gain of more than 10 times for a duty cycle of less than 0.5. The converter has other desirable features like reduced voltage stress across the switching components and continuous input current (CIC). It comprises a QZS cell made up of switched inductors and a voltage multiplier cell (VMC) made up of switched capacitors. The power loss analysis is done using PLECS software by incorporating the real parameters of switches and diodes from the datasheet. A hardware prototype of 200 W is developed in the laboratory to verify the working of the converter. In experimental results for an output power of 200 W, the converter is operated with a source voltage of 33 V at a duty ratio of 0.4 providing an output voltage of 395 V. The converter performance is good in open-loop conditions and is verified through experimental results. K E Y W O R D S duty ratio (λ), quasi-Z-source (QZS), voltage multiplier cell (VMC), voltage stress | INTRODUCTIONNowadays, gain DC-DC converters have found applications in electric vehicles (EVs), DC microgrids, switch-mode power supplies, and robotics to name a few. The power range of these high-gain converters varies from few milliwatts to a kilowatt range. The main objective is to build a topology with a high gain and reduced number of components. Desirable features like low voltage and current stress, common ground with low ripple in input current make the highgain converter an attractive choice for renewable energy applications. Conventional step-up converters and their variants need to be operated at a high duty ratio (λ) to obtain high-voltage gain. Consequently, the efficiency decreases, and the stress across the components increases. Moreover, the low and fluctuating output voltage of the PV panel cannot be fed to the inverter directly; it must be boosted with reduced ripple using a high-gain converter. 1,2 In Figure 1, it is depicted that a high-gain DC-DC converter can effectively boost the voltage from various sources like fuel cells, solar PV modules, battery, and an ultra-capacitor. These converters are used at the front end of a grid-connected inverter to maintain the DC-link voltage. The DC-DC converters have isolated and non-isolated structures. The isolated structures

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Section: Introductionmentioning

confidence: 99%

A non‐isolated quasi‐Z‐source‐based high‐gain DC–DC converter

Mahmood

Zaid

Khan

et al. 2021

Circuit Theory & Apps

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“…In addition, the coupled inductors are not off-the-shelf componentsthe same as the transformer. Recently, a quasi-Z-source network has been installed in 2 of 12 DC-DC converters [14][15][16][17][18][19][20][21][22][23][24]. Z-source networks typically consist of two inductors, two capacitors, and a diode that are connected to each other.…”

Section: Introductionmentioning

confidence: 99%

“…After that, several Z-source-type DC-DC converters were introduced. However, there are some drawbacks in previously introduced QZ DC-DC converters, such as low CR [14][15][16], an uncommon GND between input and output voltage [19,20,23], and complex implementation [18,21,22]. M. Veerachary et al proposed the QZ boost converter [17], called a sixth-order quasi-Z-source DC-DC converter (SOQZCS).…”

Section: Introductionmentioning

confidence: 99%

Improved Quasi-Z-Source High Step-Up DC–DC Converter Based on Voltage-Doubler Topology

Sai

Moon

Sugimoto³

2022

Sensors

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The step-up DC–DC converter is widely used for applications such as IoT sensor nodes, energy harvesting, and photovoltaic (PV) systems. In this article, a new topological quasi-Z-source (QZ) high step-up DC–DC converter for the PV system is proposed. The topology of this converter is based on the voltage-doubler circuits. Compared with a conventional quasi-Z-source DC–DC converter, the proposed converter features low voltage ripple at the output, the use of a common ground switch, and low stress on circuit components. The new topology, named a low-side-drive quasi-Z-source boost converter (LQZC), consists of a flying capacitor (CF), the QZ network, two diodes, and a N-channel MOS switch. A 60 W laboratory prototype DC–DC converter achieved 94.9% power efficiency.

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“…Unfortunately, these sources provide low output voltages when compared to the peak value of grid voltage, therefore high gain step-up dc-dc converters are required to efficiently comply with the requirements for grid connection [4]. In light of this, the literature has presented several topologies of high gain step-up dc-dc converters in the past few years [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, both works approached these connections to provide high-gain step-up dc-dc converters, presenting several possible combinations of converters, detailing the modulations and control strategies, and deriving the static gain equations. Some of these differential converters were detailed in [10,22,23].…”

Section: Introductionmentioning

confidence: 99%

Partial Power Processing and Efficiency Analysis of dc-dc Differential Converters

2022

Self Cite

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This paper presents a partial power processing and an efficiency analysis of dc-dc differential converters based on the use of two basic converters of the same group: the positive or negative group. The paper contributes theoretical analysis and demonstrates that the differential converters based on the positive group process has more power than the load requires, and that the differential converters based on the negative group process has less power than the load needs. This is an important advantage of the negative group converters, since a parcel of the output power is directly transferred by the input source to the load, resulting in partial power processing. In order to verify the theoretical analysis herein developed, ten prototypes are evaluated considering an input voltage of 20 V and output power of 100 W.

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New High Step-up dc-dc Converter with Quasi-Z-Source Network and Switched-Capacitor Cell

Cited by 9 publications

References 18 publications

A non‐isolated quasi‐Z‐source‐based high‐gain DC–DC converter

A non‐isolated quasi‐Z‐source‐based high‐gain DC–DC converter

Improved Quasi-Z-Source High Step-Up DC–DC Converter Based on Voltage-Doubler Topology

Partial Power Processing and Efficiency Analysis of dc-dc Differential Converters

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