An Enhanced-Gain Quadratic-Boost DC-DC Configuration

Varesi, Kazem; Esfahlan, Amir Ghorbani

doi:10.1109/icee50131.2020.9260653

Cited by 11 publications

(8 citation statements)

References 16 publications

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“…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. In Varesi and Ghorbani, 34 a high‐gain converter with common ground and CIC is proposed.…”

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 the case of the topology shown in [25], the switch stress increases after a conversion gain ratio of 14. The converters in [26,27] also have three inductors but suffer from a low-voltage gain. The switch S 1 of [27] has high-voltage stress after a voltage gain of 8.…”

Section: Comparison Of the Proposed Topologymentioning

confidence: 99%

“…The converters in [26,27] also have three inductors but suffer from a low-voltage gain. The switch S 1 of [27] has high-voltage stress after a voltage gain of 8. The quadratic boost converter in [29] has the same inductors as the proposed converter, but the voltage gain is half as compared to the proposed converter, and it has a single switch only.…”

Section: Comparison Of the Proposed Topologymentioning

confidence: 99%

“…The gain of the converter is lower as compared to similar topologies. A variety of quadratic boost converters are introduced in [25][26][27][28][29][30], each with its set of advantages and disadvantages. The authors in [25] have proposed a simple quadratic boost converter, but it lacks a common ground, whereas a modified quadratic boost converter in [26] is implemented, resulting in twice the gain as compared to the quadratic boost converter.…”

Section: Introductionmentioning

confidence: 99%

“…The authors in [25] have proposed a simple quadratic boost converter, but it lacks a common ground, whereas a modified quadratic boost converter in [26] is implemented, resulting in twice the gain as compared to the quadratic boost converter. The converter proposed in [27] has a common ground but a lower gain as compared to the topology proposed in [28], which lacks a common ground. The quadratic converter proposed by the authors in [29] has more components as compared to [30] but has a higher gain at the cost of a decreased efficiency due to increased heat losses.…”

Section: Introductionmentioning

confidence: 99%

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A Nonisolated Transformerless High-Gain DC–DC Converter for Renewable Energy Applications

et al. 2022

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Dc–dc converters with a high gain, continuous input current, and common ground are usually employed in renewable energy applications to boost the generated output voltage of renewable energy sources. In this paper, a high-gain dc–dc converter comprising a voltage multiplier cell (VMC) and a common ground with continuous input current and low-voltage stress across semiconductor devices is proposed. The converter produces a voltage gain of about ten times compared to the conventional boost converter at a duty ratio of 50% by utilizing switched capacitors and switched inductors. The simultaneous operation of both the switches with the same gate pulse offers easy and simple control of the proposed converter with a wide range of operations. The boundary operation of the converter is analyzed and presented in both modes, i.e., continuous conduction mode (CCM) and discontinuous conduction mode (DCM). Ideal and nonideal analysis of the converter is carried out by integrating real models of passive elements and semiconductor devices by using PLECS software. The simulation is also used to calculate the losses and hence the working efficiency of the converter. The performance of the converter analyzed in the steady state is compared with various similar converters based on the voltage boosting capability and switching stresses. A hardware prototype is also developed to confirm and validate the theoretical analysis and simulation of the proposed converter.

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