A novel transformerless high step‐Up DC‐DC converter with active switched‐inductor and quasi‐Z‐source network

Zhao, J. Z.; Chen, Daolian; Jiang, Jiahui

doi:10.1049/pel2.12128

Cited by 19 publications

(14 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The converter proposed in Kumar and Veerachary 30 has a greater number of inductors and total components than the proposed converter, but the voltage gain is lower and stress is far higher than the proposed converter. The converter introduced in Zhao et al 31 has the same components as the proposed structure, but the voltage stress on switches is quite high. Tp‐7 has a higher gain than that of the proposed converter, but this converter has a greater number of components than the proposed converter.…”

Section: Comparative Analysis With Existing Similar Convertersmentioning

confidence: 99%

“…In Kumar and Veerachary, 30 a Z‐network plus SC‐based DC–DC converter (ZSCBC) has been proposed which has a modified Z‐network and a switched capacitor circuit with an output filter capacitor, but the discontinuous input current restricts its application. Furthermore, the converter proposed in Zhao et al 31 consists of two QZS networks with one active switched inductor. The boost factor per inductor of this converter is even less.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Mahmood

Zaid

Khan

et al. 2021

Circuit Theory & Apps

View full text Add to dashboard Cite

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

show abstract

Section: Comparative Analysis With Existing Similar Convertersmentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…In consequence, numerous efficient switching structures have been proposed in the literature. Zhao et al in [10] proposed a high-gain step-converter using a combination of active switched-inductor structure and quasi z-source network. The ASL combination in the converter achieves high voltage-gain with reduced stress on the semiconductor devices.…”

Section: Introductionmentioning

confidence: 99%

Comprehensive analysis and design of a switched‐inductor type low inductance‐requirement DC‐DC buck‐boost converter for low power applications

Hamood-Ur-Rehman

Ahmed

Sher

et al. 2023

IET Power Electronics

View full text Add to dashboard Cite

This paper aims to comprehensively analyze, critically discuss, and provide a step‐by‐step design guideline for a previously proposed Modified Switched‐Inductor type Buck‐Boost (MSIBB) converter which is based on a boost converter. The MSIBB converter is originally based on switched‐inductor phenomena whereby two inductors are switched in a proper sequence to ensure appreciable buck as well as boost characteristics. Appreciable buck and boost characteristics are desirable specifically in low power applications. In regulated low power applications, DC‐DC switching power converters undergo frequent mode‐shift from buck to boost, and vice versa. At the overlap between input/output voltage, the converters efficiency does not suffer significantly, but the wide input‐voltage operating area compels the regulated converters to operate at extreme values of the duty cycle, that is, close to 0 and 1, which causes lower efficiency. A high‐efficiency switching converter is required specifically for low‐power applications that can ensure voltage step‐up and step‐down without resorting to operating at extreme values of the duty‐cycle. In this perspective, switched‐inductors based converter, termed as MSIBB converter, was previously proposed. The MSIBB converter exhibits appreciable voltage‐gain, and experiences lesser current/voltage stress on the semiconductor components. In particular, it has comparable Maximum Switch Stress Factor that generally translates to alleviated switch conduction and switching losses. Besides, the inductors minimum peak stored energy is comparatively lower, reflecting reduced physical size of the inductors as well as reduced onboard losses, and therefore better caters to low power applications. Detailed analysis of the converter and step‐by‐step approach for design example, and comparative analysis are carried out, besides providing some experimental results from the previously proposed converter.

show abstract

“…Quasi-Z-source (qZs) converter is a typical converter derived from the Z-source converter which has alleviated its two drawbacks of discontinuous input current and the lack of common ground. Thus, recently, many high step-up qZs converters are introduced to mitigate the Z-source and boost topologies problems simultaneously [6][7][8][9][10][11][12][13][14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

High step‐up quasi‐Z‐source converter with full soft switching range, continuous input current and low auxiliary elements

Hajilou

Packnezhad

Farzanehfard

2023

IET Power Electronics

View full text Add to dashboard Cite

This paper presents a fully soft switched high step‐up DC–DC converter based on quasi‐Z‐source converter. The voltage gain is boosted by combining coupled inductors and switched capacitor techniques. Moreover, a ZVT cell comprising of only a single switch and an inductor coupled to the quasi‐Z‐source inductor is utilized to reduce the magnetic cores and realize soft switching for all semiconductors without imposing any extra voltage or current stress on the converter elements. The main switch operates at zero voltage switching and zero current switching (ZCS) at turn‐on which is independent of the load and duty cycle variations. Hence, soft switching condition for the main switch at turn‐off is easily provided by a snubber capacitor. In addition, the reverse recovery problem of all the converter diodes is significantly mitigated by ZCS at turn‐off while the continuous current at the input source is maintained. In order to verify the theoretical analysis and the proposed converter operation, a converter prototype is implemented at 300 W and 100 kHz. Finally, a comprehensive comparison is performed between the proposed converter and other high step‐up converters based on quasi‐Z‐source structure, to demonstrate the merits of the proposed converter.

show abstract

A novel transformerless high step‐Up DC‐DC converter with active switched‐inductor and quasi‐Z‐source network

Cited by 19 publications

References 23 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

Comprehensive analysis and design of a switched‐inductor type low inductance‐requirement DC‐DC buck‐boost converter for low power applications

High step‐up quasi‐Z‐source converter with full soft switching range, continuous input current and low auxiliary elements

Contact Info

Product

Resources

About