A Wide Voltage Gain Bidirectional DC–DC Converter Based on Quasi Z-Source and Switched Capacitor Network

A noninverting DC–DC converter with high voltage gain and low voltage stress on the switches for industrial applications is proposed in this research article. The proposed converter has used a voltage multiplier cell twice in the circuit that gives the proposed converter a symmetrical configuration and provides low voltage stress across both the switches. The symmetrical configuration of the proposed converter makes it easier to select the components. The proposed converter provides a voltage gain that is more than three times of the conventional boost converter. A 200‐W hardware prototype of the proposed converter has been developed and tested under continuous conduction for static and dynamic conditions. The power loss analysis is done using PLECS software by incorporating the real parameters of switches and diodes from the datasheet. The converter performance is found to be good in open‐loop conditions and is in agreement with the theoretical analysis.

Section: Introductionmentioning

confidence: 99%

A high gain noninverting DC–DC converter with low voltage stress for industrial applications

Ahmad

Siddique

Sarwar

et al. 2021

“…In Meinagh et al, 9 the proposed topology has CIC, but the operation is limited to a duty of less than 0.33. In Kumar et al, 10 a switched capacitor QZS converter with high gain is presented. The converter can be used in an EV.…”

Section: Introductionmentioning

confidence: 99%

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

Mahmood

Zaid

Khan

et al. 2021

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

“…Table 1 and Figure 9 clearly indicate that the proposed converter achieves the dominant voltage gain characteristics than reported converters. [9][10][11][12][13][14][15][16][17][18] Interestingly, converters 13,14 have a superior gain plot at initial duty rations in step-up operation than the proposed converter. However, previous works 13,14 utilized more components, and moreover, in step-down mode at initial duty rations gain plot is not impressive as a proposed converter.…”

Section: Comparative Analysis Of Proposed Convertermentioning

confidence: 99%

“…It is almost equal to or lesser than all reported converters. [10][11][12][13][14][15][16][17][18] In addition, the proposed converter requires only two inductors, which reduces the bulkiness of the system.…”

Section: Comparative Analysis Of Proposed Convertermentioning

confidence: 99%

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A novel bi‐directional high‐gain DC‐DC converter with optimum number of components

Krishna

Karthikeyan

2022

Most emerging applications of battery energy storage systems, fuel cells, and unified power supply (UPS) applications require essential bi‐directional power capability with a high conversion ratio. It supports the integration of the high‐voltage DC‐bus with an energy storage unit or fuel cell. In order to meet this requirement, this paper proposes a novel nonisolated high‐gain DC‐DC converter with bi‐directional power flow capability. This converter is configured with a hybrid structure with a combination of the switched capacitor (SC) and switched inductor (SI) techniques. Moreover, this converter can attain extreme voltage gain with less number of semiconductors and passive components. As a result, the converter cost gets reduced and achieves a wide range of voltage gain at a lesser duty ratio. Furthermore, steady‐state analysis and performance of the proposed topology and its characteristics were presented in this paper. Additionally, a detailed comparative analysis was presented with the most recent literature. Finally, a 500‐W experimental prototype has been fabricated to authorize the performance, feasibility, and analytical waveforms with experimental results.