A quasi-Z-source DC-DC converter

Conventional dc-dc boost converters have limited boosting capabilities, and the main switching device may suffer relatively high voltage stress and current stress. A novel transformerless dc-dc boost converter is proposed in this paper. The proposed topology, which combines the traditional active switch-inductor and quasi-Z-source network, can increase the voltage gain without limiting the duty cycle or increasing the voltage and current stresses of the power switches. The detailed analysis including working principles, steadystate characteristics, non-ideal element analysis and a comprehensive comparison is also presented in this paper. To verify the proposed converter's performance, a prototype circuit with 20-30 V input voltage, 200 V output voltage, and 200 W output power is implemented in the laboratory. Experiment results confirm the theoretical analysis and advantages of the proposed converter.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The switching loss can be estimated by linearizing the current and voltage of the switches when they are changing the states [13], as…”

Section: Power Loss and Efficiencymentioning

confidence: 99%

“…Many high step-up dc-dc converters without a coupled-inductor have been proposed. The focus of the research studies include the voltage-lift [8], cascade techniques [9], switched-inductor [10,11], switchedcapacitor [11,12] and impedance-network-based topologies [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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

Zhao

Chen

Jiang

2021

IET Power Electronics

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“…To compensate for the shortcomings of traditional Z-source step-up converters, the concept of the quasi-Z-source network was proposed [10,11,[16][17][18]. This architecture has the same voltage gain as the Z-source architecture but solves the problems of discontinuous input currents, excessive capacitor voltage stress, and nonisolated converter input and output terminals not sharing a common ground.…”

Section: Literature Reviewmentioning

confidence: 99%

Novel High-Efficiency High Step-Up DC–DC Converter with Soft Switching and Low Component Voltage Stress for Photovoltaic System

Wang

2021

Processes

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This study developed a novel, high-efficiency, high step-up DC–DC converter for photovoltaic (PV) systems. The converter can step-up the low output voltage of PV modules to the voltage level of the inverter and is used to feed into the grid. The converter can achieve a high step-up voltage through its architecture consisting of a three-winding coupled inductor common iron core on the low-voltage side and a half-wave voltage doubler circuit on the high-voltage side. The leakage inductance energy generated by the coupling inductor during the conversion process can be recovered by the capacitor on the low-voltage side to reduce the voltage surge on the power switch, which gives the power switch of the circuit a soft-switching effect. In addition, the half-wave voltage doubler circuit on the high-voltage side can recover the leakage inductance energy of the tertiary side and increase the output voltage. The advantages of the circuit are low loss, high efficiency, high conversion ratio, and low component voltage stress. Finally, a 500-W high step-up converter was experimentally tested to verify the feasibility and practicability of the proposed architecture. The results revealed that the highest efficiency of the circuit is 98%.

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“…Large inductor current ripple will increase stress on switch and diode. Generally, ripple is calculated using the expression [29], %…”

Section: Circuit Designmentioning

confidence: 99%

Design and analysis of a novel quasi Z source based asymmetric multilevel inverter for PV applications

Sankar

Babu

2020

IJPEDS

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A novel Quasi Z source (QZS) based Asymmetric Multilevel Inverter for Photovoltaic application is proposed in this paper. It consists of an Impedance source-based dc-dc converter and Asymmetric Multilevel Inverter (AMLI). QZS network can buck/boost the input DC voltage eliminating separate DC-DC boost converter. MLI topology with reduced switches and DC input provide high quality output with large levels. DC input magnitude of the inverter is based on an algorithm. The system ensures high voltage gain, low switching stress, lessened gate circuitry, high reliability and better harmonic profile. Low THD values ensures reduced filter size and hence cost. The theoretical concepts and parameter design of the proposed topology is illustrated in detail. The performance analysis is verified using Matlab/Simulink environment.

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A quasi-Z-source DC-DC converter

Cited by 34 publications

References 11 publications

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

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

Novel High-Efficiency High Step-Up DC–DC Converter with Soft Switching and Low Component Voltage Stress for Photovoltaic System

Design and analysis of a novel quasi Z source based asymmetric multilevel inverter for PV applications

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